HCPL-4200-300E - AVAGO TECHNOLOGIES

Features

x Data output compatible with LSTTL, TTL and CMOS

x 20 K Baud data rate at 1400 metres line length

x Guaranteed On and Oﬀ thresholds

x LED is protected from excess current

x Input threshold hysteresis

x Three-state output compatible with data buses

x Internal shield for high Common Mode Rejection

x Safety approval

UL recognized -3750 V rms, for 1 minute

CSA approved

x Optically coupled 20 mA current loop transmitter,

HCPL-4100, also available

Applications

x Isolated 20 mA current

x Loop receiver in:

Computer peripherals

Industrial control equipment

Data communications equipment

A 0.1 μF bypass capacitor connected between pins 8 and 5 is recommended.

Description

The HCPL-4200 optocoupler is designed to operate as a

receiver in equipment using the 20 mA Current Loop. 20

mA current loop systems conventionally signal a logic

high state by transmitting 20 mA of loop current (MARK),

and signal a logic low state by allowing no more than a

few milliamperes of loop current (SPACE). Optical cou-

pling of the signal from the 20 mA current loop to the

logic output breaks ground loops and provides for a very

high common mode rejection. The HCPL-4200 aids in the

design process by providing guaranteed thresholds for

logic high state and logic low state for the current loop,

providing an LSTTL, TTL, or CMOS compatible logic in-

terface, and providing guaranteed common mode re-

jection. The buﬀer circuit on the current loop side of the

HCPL-4200 provides typically 0.8 mA of hysteresis which

increases the immunity to common mode and diﬀeren-

tial mode noise. The buﬀer also provides a controlled

amount of LED drive current which takes into account

any LED light output degradation. The internal shield al-

lows a guaranteed 1000 V/μs common mode transient

immunity.

Functional Diagram

HCPL-4200

Optically Coupled 20 mA Current Loop Receiver

Data Sheet

Lead (Pb) Free

RoHS 6 fully

compliant

RoHS 6 fully compliant options available;

-xxxE denotes a lead-free product

CAUTION: It is advised that normal static precautions be taken in handling and assembly

of this component to prevent damage and/or degradation which may be induced by ESD.

Ordering Information

HCPL-4200 is UL Recognized with 3750 Vrms for 1 minute per UL1577.

Part number

Option

Package Surface Mount Gull Wing Tape & Reel Quantity

RoHS

Compliant

Non-RoHS

Compliant

HCPL-4200

-000E No option

300 mil

DIP-8

50 per tube

-300E #300 X X 50 per tube

-500E #500 X X X 1000 per reel

To order, choose a part number from the part number column and combine with the desired option from the option

column to form an order entry.

Example 1:

HCPL-4200-500E to order product of Gull Wing Surface Mount package in Tape and Reel packaging in RoHS compli-

ant.

Example 2:

HCPL-4200 to order product of 300 mil DIP package in tube packaging and non-RoHS compliant.

Option datasheets are available. Contact your Avago sales representative or authorized distributor for information.

Remarks: The notation ‘#XXX’ is used for existing products, while (new) products launched since 15th July 2001 and

RoHS compliant option will use ‘-XXXE’.

Package Outline Drawings – 8 Pin DIP Package (HCPL-4200)

8 Pin DIP Package with Gull Wing Surface Mount Option 300 (HCPL-4200)

9.65 ± 0.25

(0.380 ± 0.010)

1.78 (0.070) MAX.

1.19 (0.047) MAX.

A XXXX

YYWW

DATE CODE

1.080 ± 0.320

(0.043 ± 0.013) 2.54 ± 0.25

(0.100 ± 0.010)

0.51 (0.020) MIN.

0.65 (0.025) MAX.

4.70 (0.185) MAX.

2.92 (0.115) MIN.

DIMENSIONS IN MILLIMETERS AND (INCHES).

NOTE: FLOATING LEAD PROTRUSION IS 0.25 mm (10 mils) MAX.

5678

4321

5° TYP.

TYPE NUMBER

RECOGNITION

0.254 + 0.076

- 0.051

(0.010+ 0.003)

- 0.002)

7.62 ± 0.25

(0.300 ± 0.010)

6.35 ± 0.25

(0.250 ± 0.010)

3.56 ± 0.13

(0.140 ± 0.005)

0.635 ± 0.25

(0.025 ± 0.010) 12° NOM.

9.65 ± 0.25

(0.380 ± 0.010)

0.635 ± 0.130

(0.025 ± 0.005)

7.62 ± 0.25

(0.300 ± 0.010)

9.65 ± 0.25

(0.380 ± 0.010)

6.350 ± 0.25

(0.250 ± 0.010)

1.080 ± 0.320

(0.043 ± 0.013)

1.780

(0.070)

MAX.

1.19

(0.047)

MAX.

2.54

(0.100)

BSC

0.254 + 0.076

- 0.051

(0.010+ 0.003)

- 0.002)

1.016 (0.040)

1.27 (0.050)

10.9 (0.430)

2.0 (0.080)

LAND PATTERN RECOMMENDATION

3.56 ± 0.13

(0.140 ± 0.005)

DIMENSIONS IN MILLIMETERS (INCHES).

LEAD COPLANARITY = 0.10 mm (0.004 INCHES).

NOTE: FLOATING LEAD PROTRUSION IS 0.25 mm (10 mils) MAX.

Figure 1a. Solder Reﬂow Thermal Proﬁle.

Regulatory Information

The HCPL-4200 has been approved by the following organizations:

CSA

Approved under CSA Component Acceptance Notice

#5, File CA 88324.

Solder Reﬂow Thermal Proﬁle

Recommended Pb-Free IR Proﬁle

TIME (SECONDS)

TEMPERATURE (°C)

200

100

50 150100 200 250

300

SEC.

50 SEC.

SEC.

160°C

140°C

150°C

PEAK

TEMP.

245°C

PEAK

TEMP.

240°C

PEAK

TEMP.

230°C

SOLDERING

TIME

200°C

PREHEATING TIME

150°C, 90 + 30 SEC.

2.5°C ± 0.5°C/SEC.

3°C + 1°C/–0.5°C

TIGHT

TYPICAL

LOOSE

ROOM

TEMPERATURE

PREHEATING RATE 3°C + 1°C/–0.5°C/SEC.

REFLOW HEATING RATE 2.5°C ± 0.5°C/SEC.

Figure 1b. Pb-Free IR Proﬁle.

217 °C

RAMP-DOWN

6 °C/SEC. MAX.

RAMP-UP

3 °C/SEC. MAX.

150 - 200 °C

260 +0/-5 °C

t 25 °C to PEAK

60 to 150 SEC.

20-40 SEC.

TIME WITHIN 5 °C of ACTUAL

PEAK TEMPERATURE

PREHEAT

60 to 180 SEC.

smax

smin

TIME

TEMPERATURE

NOTES:

THE TIME FROM 25 °C to PEAK TEMPERATURE = 8 MINUTES MAX.

smax

= 200 °C, T

smin

= 150 °C

Note: Non-halide ﬂux should be used.

Recognized under UL 1577, Component Recognition

Program, File E55361.

Absolute Maximum Ratings

(No Derating Required up to 70°C)

Storage Temperature .............................................................................................-55°C to +125°C

Operating Temperature ..........................................................................................-40°C to +85°C

Lead Solder Temperature ..............................260°C for 10 s (1.6 mm below seating plane)

Supply Voltage – VCC ..........................................................................................................0 V to 20 V

Average Input Current - II ...................................................................................-30 mA to 30 mA

Peak Transient Input Current - II ........................................................................................... 0.5 A[1]

Enable Input Voltage – VE ...........................................................................................-0.5 V to 20 V

Output Voltage – VO .......................................................................................................-0.5 V to 20 V

Average Output Current – IO ...................................................................................................25 mA

Input Power Dissipation – PI ..............................................................................................90 mW[2]

Output Power Dissipation – PO ......................................................................................210 mW[3]

Total Power Dissipation – P .............................................................................................255 mW[4]

Infrared and Vapor Phase Reﬂow Temperature

(Option #300) ..................................................................................... see Fig. 1, Thermal Proﬁle

Recommended Operating Conditions

Parameter Symbol Min. Max. Units

Power Supply Voltage VCC 4.5 20 Volts

Forward Input Current ISI 0 2.0 mA

(SPACE)

Forward Input Current IMI 14 24 mA

(MARK)

Operating Temperature TA 0 70 °C

Fan Out N 0 4 TTL Loads

Logic Low Enable VEL 0 0.8 Volts

Voltage

Logic High Enable VEH 2.0 20 Volts

Voltage

Insulation and Safety Related Speciﬁcations

Parameter Symbol Value Units Conditions

Min. External Air Gap L(IO1) 7.1 mm Measured from input terminals to output

(External Clearance) terminals, shortest distance through air

Min. External Tracking Path L(IO2) 7.4 mm Measured from input terminals to output

(External Creepage) terminals, shortest distance path along body

Min. Internal Plastic Gap 0.08 mm Through insulation distance, conductor to

(Internal Clearance) conductor, usually the direct distance

between the photoemitter and photodetector

inside the optocoupler cavity

Tracking Resistance CTI 200 volts DIN IEC 112/VDE 0303 PART 1

(Comparative Tracking Index)

Isolation Group IIIa Material Group (DIN VDE 0110, 1/89, Table 1)

Option 300 – surface mount classiﬁcation is Class A in accordance with CECC 00802.

DC Electrical Speciﬁcations

For 0°C ≤TA ≤70°C, 4.5 V ≤VCC ≤20 V, VE = 0.8 V, all typicals at TA = 25°C and VCC = 5 V unless otherwise noted. See note 13.

Parameter Symbol Min. Typ. Max. Units Test Conditions Fig. Note

Mark State Input IMI 12 mA 2, 3,

Current 4

Mark State Input VMI 2.52 2.75 Volts II = 20 mA VE = Don’t Care 4, 5

Voltage

Space State Input ISI 3 mA 2, 3,

Current 4

Space State Input VSI 1.6 2.2 Volts II = 0.5 to 2.0 mA VE = Don’t 2, 4

Voltage Care

Input Hysteresis IHYS 0.3 0.8 mA 2

Current

Logic Low Output VOL 0.5 Volts IOL = 6.4 mA II = 3 mA 6

Voltage (4 TTL Loads)

Logic High Output VOH 2.4 Volts IOH = -2.6 mA, II = 12 mA 7

Voltage

Output Leakage IOHH 100 μA VO = 5.5 V II = 20 mA

500 μA VO = 20 V

Logic High Enable VEH 2.0 Volts

Voltage

Logic Low Enable VEL 0.8 Volts

Voltage

Logic High Enable IEH 20 μA VE = 2.7 V

100 μA VE = 5.5 V

0.004 250 μA VE = 20 V

Logic Low Enable IEL -0.32 mA VE = 0.4 V

Current

Logic Low Supply ICCL 4.5 6.0 mA VCC = 5.5 V II = 0 mA

5.25 7.5 mA VCC = 20 V

Logic High Supply ICCH 2.7 4.5 mA VCC = 5.5 V II = 20 mA

3.1 6.0 mA VCC = 20 V

High Impedance IOZL -20 μA VO = 0.4 V VE = 2 V,

OZH 20 μA VO = 2.4 V

100 μA VO = 5.5 V

500 μA VO = 20 V

Logic Low Short IOSL 25 mA VO = VCC = 5.5 V II = 0 mA 5

40 mA VO = VCC = 20 V

Logic High Short IOSH -10 mA VCC = 5.5 V II = 20 mA 5

-25 mA VCC = 20 V

Input Capacitance CIN 120 pF f = 1 MHz, VI = 0 V dc,

Pins 1 and 2

Current (VOUT > VCC)

Current

State Output

Current

Circuit Output Cur-

rent

Circuit Output Cur-

rent

II = 20 mA

VO = GND

VCC = 4.5 V

VE = Don’t Care

Switching Speciﬁcations

For 0°C ≤ TA ≤ 70°C, 4.5 V ≤ VCC ≤ 20 V, VE = 0.8 V, all typicals at TA = 25°C and VCC = 5 V unless otherwise noted. See note 13.

Parameter Symbol Min. Typ. Max. Units Test Conditions Fig. Note

Propagation Delay Time tPLH 0.23 1.6 μs VE = 0 V, 8, 9, 7

to Logic High Output Level CL = 15 pF 10

Propagation Delay Time tPHL 0.17 1.0 μs VE = 0 V, 8, 9, 8

to Logic Low Output Level CL = 15 pF 10

Propagation Delay Time tPLH - tPHL 60 ns II = 20 mA, 8, 9,

Skew CL = 15 pF 10

Output Enable Time to tPZL 25 ns II = 0 mA, 12, 13,

Logic Low Level CL = 15 pF 15

Output Enable Time to tPZH 28 ns II = 20 mA, 12, 13,

Logic High Level CL = 15 pF 14

Output Disable Time to tPLZ 60 ns II = 0 mA, 12, 13,

Logic Low Level CL = 15 pF 15

Output Disable Time to tPHZ 105 ns II = 20 mA, 12, 13,

Logic High Level CL = 15 pF 14

Output Rise Time tr 55 ns VCC = 5 V, 8, 9, 9

(10-90%) CL = 15 pF 11

Output Fall Time tf 15 ns VCC = 5 V, 8, 9, 10

(90-10%) CL = 15 pF 11

Common Mode Transient |CMH| 1,000 10,000 V/μs VCM = 50 V (peak) 16 11

Immunity at Logic High II = 12 mA,

Output Level TA = 25°C

Common Mode Transient |CML| 1,000 10,000 V/μs VCM = 50 V (peak) 16 12

Immunity at Logic Low II = 3 mA,

Output Level TA = 25°C

Package Characteristics

For 0°C ≤ TA ≤ 70°C, unless otherwise speciﬁed. All typicals at TA = 25°C.

Parameter Symbol Min. Typ. Max. Units Test Conditions Fig. Notes

Input-Output Momentary VISO 3750 V rms RH ≤ 50%, t = 1 min, 6, 14

Withstand Voltage* TA = 25°C

Resistance, Input-Output RI-O 1012 ohms VI-O = 500 V dc 6

Capacitance, Input-Output CI-O 1.0 pF f = 1 MHz, VI-O = 0 V 6

*The Input-Output Momentary Withstand Voltage is a dielectric voltage rating that should not be interpreted as an input-output continuous volt-

age rating. For the continuous voltage rating refer to the IEC/EN/DIN EN 60747-5-2 Insulation Characteristics Table (if applicable), your equipment

level safety speciﬁcation, or Avago Application Note 1074, “Optocoupler Input-Output Endurance Voltage.”

Notes:

1. ≤ 1 μs pulse width, 300 pps.

2. Derate linearly above 70°C free air temperature at a rate of 1.6 mW/°C. Proper application of the derating factors will prevent IC junction

temperatures from exceeding 125°C for ambient temperatures up to 85°C.

3. Derate linearly above 70°C free air temperature at a rate of 3.8 mW/°C.

4. Derate linearly above 70°C free air temperature at a rate of 4.6 mW/°C.

5. Duration of output short circuit time shall not exceed 10 ms.

6. The device is considered a two terminal device, pins 1, 2, 3, and 4 are connected together and pins 5, 6, 7, and 8 are connected together.

7. The tPLH propagation delay is measured from the 10 mA level on the leading edge of the input pulse to the 1.3 V level on the leading edge of

the output pulse.

8. The tPHL propagation delay is measured from the 10 mA level on the trailing edge of the input pulse to the 1.3 V level on the trailing edge of the

output pulse.

9. The rise time, tr, is measured from the 10% to the 90% level on the rising edge of the output logic pulse.

10. The fall time, tf, is measured from the 90% to the 10% level on the falling edge of the output logic pulse.

11. Common mode transient immunity in the logic high level is the maximum (negative) dVCM/dt on the trailing edge of the common mode pulse,

VCM, which can be sustained with the output voltage in the logic high state (i.e., VO ≥ 2 V).

12. Common mode transient immunity in the logic low level is the maximum (positive) dVCM/dt on the leading edge of the common mode pulse,

VCM, which can be sustained with the output voltage in the logic low state (i.e., VO ≤ 0.8 V).

13. Use of a 0.1 μF bypass capacitor connected between pins 5 and 8 is recommended.

14. In accordance with UL 1577, each optocoupler momentary withstand is proof tested by applying an insulation test voltage ≥ 4500 V rms for 1

second (leakage detection current limit, Ii-o ≤ 5 μA).

Figure 5. Typical Input Voltage vs. Temperature. Figure 6. Typical Logic Low Output Voltage vs.

Temperature.

Figure 7. Typical Logic High Output Current vs.

Temperature.

– LOOP VOLTAGE – VOLTS

-50 100

2.8

2.2

– AMBIENT TEMPERATURE –°C

-25 0 25

2.6

50 75

2.4

= 12 mA

= 20 mA

– LOW LEVEL OUTPUT VOLTAGE – V

-60 100

1.0

– TEMPERATURE –°C

-40 0 20

0.7

60 80

0.3

40-20

0.9

0.8

0.6

0.5

0.4

0.2

0.1

= 4.5 V

= 3 mA

= 6.4 mA

– HIGH LEVEL OUTPUT CURRENT – mA

-60 100

-8

– TEMPERATURE –°C

-40 0 20

-3

60 80

-6

40-20

-1

-2

-4

-5

-7

= 4.5 V

= 12 mA

= 2.7 V

= 2.4 V

Figure 2. Typical Output Voltage vs. Loop Cur-

rent.

Figure 3. Typical Current Switching Threshold vs.

Temperature.

II – INPUT SWITCHING THRESHOLD – mA

-50 100

TA – AMBIENT TEMPERATURE –°C

-25 0 25

50 75

4IHYS

Figure 4. Typical Input Loop Voltage vs. Input

Current.

Figure 8. Test Circuit for tPHL, tPLH, tr, and tf.

Figure 13. Waveforms for tPZH, tPZL, tPHZ, and tPLZ.Figure 12. Test Circuit for tPZH, tPZL, tPHZ, and tPLZ.

Figure 9. Waveforms for tPHL, tPLH, tr, and tf.

Figure 10. Typical Propagation Delay vs. Temperature.

– PROPAGATION DELAY – μs

-60 100

0.5

– TEMPERATURE –°C

-40 0 20

0.3

60 80

0.1

40-20

0.4

0.2

= 5 V

= 15 pF

PLH

PHL

, t

– RISE, FALL TIMES – ns

-60 100

120

– TEMPERATURE –°C

-40 0 20 60 80

40-20

100

= 5 V

= 15 pF

Figure 11. Typical Rise, Fall Time vs. Temperature.

– ENABLE PROPAGATION DELAY – ns

-60 100

200

– TEMPERATURE –°C

-40 0 20 60 80

40-20

150

100

= 15 pF

PHZ

PZH

20 V

4.5 V

20 V

tp – ENABLE PROPAGATION DELAY – ns

-60 100

100

TA – TEMPERATURE –°C

-40 0 20 60 80

40-20

VCC

CL = 15 pF

tPLZ

tPZL

20 V

4.5 V

20 V

Figure 14. Typical Logic High Enable Propagation Delay vs. Temperature. Figure 15. Typical Logic Low Enable Propagation Delay vs. Temperature.

Figure 16. Test Circuit for Common Mode Transient Immunity.

Applications

Data transfer between equipment which employs cur-

rent loop circuits can be accomplished via one of three

conﬁgurations: simplex, half duplex or full duplex com-

munication. With these conﬁgurations, point-to-point

and multidrop arrange ments are possible. The appropri-

ate conﬁguration to use depends upon data rate, num-

ber of stations, number and length of lines, direction of

data ﬂow, protocol, current source location and voltage

compliance value, etc.

Simplex

The simplex conﬁguration, whether point to point or

multi drop, gives unidirectional data ﬂow from transmit-

ter to receiver(s). This is the simplest conﬁguration for use

in long line length (two wire), for high data rate, and low

current source compliance level applications. Block dia-

grams of simplex point-to-point and multidrop arrange-

ments are given in Figures 17a and 17b respectively for

the HCPL-4200 receiver optocoupler.

For the highest data rate per formance in a current loop,

the conﬁguration of a non-isolated active transmitter

(containing current source) transmitting data to a re-

mote isolated receiver(s) should be used. When the cur-

rent source is located at the trans mitter end, the loop is

charged approximately to VMI (2.5 V). Alternatively, when

the current source is located at the receiver end, the loop

is charged to the full compliance voltage level. The lower

the charged voltage level the faster the data rate will be.

In the conﬁgurations of Figures 17a and 17b, data rate is

independent of the current source voltage compliance

level. An adequate compliance level of current source

must be available for voltage drops across station(s) dur-

ing the MARK state in multi drop applications or for long

line length. The maximum compliance level is deter-

mined by the trans mitter breakdown characteristic.

Figure 17. Simplex Current Loop System Conﬁgurations for (a) Point-to-Point, (b) Multidrop.

A recommended non-isolated active transmitter circuit

which can be used with the HCPL-4200 in point-to-point

or in multidrop 20 mA current loop applications is given

in Figure 18. The current source is controlled via a stan-

dard TTL 7407 buﬀer to provide high output impedance

of current source in both the ON

and OFF states. This non-isolated active transmitter pro-

vides a nominal 20 mA loop current for the listed values

of VCC, R2 and R3 in Figure 18.

Length of current loop (one direction) versus minimum

required DC supply voltage, VCC, of the circuit in Figure 18

is graphically illustrated in Figure 19. Multidrop conﬁgu-

rations will require larger VCC than Figure 19 predicts in

order to account for additional station terminal voltage

drops.

Typical data rate performance versus distance is illus-

trated in Figure 20 for the combination of a non-isolated

active transmitter and HCPL-4200 optically coupled cur-

rent loop receiver shown in Figure 18. Curves are shown

for 10% and 25% distortion data rate. 10% (25%) distor-

tion data rate is deﬁned as that rate at which 10% (25%)

distortion occurs to output bit interval with respect to

input bit interval. An input Non-Return-to-Zero (NRZ)

test waveform of 16 bits (0000001011111101) was used

for data rate distortion measure ments. Data rate is inde-

pendent of current source supply voltage, VCC.

The cable used contained ﬁve pairs of unshielded, twist-

ed, 22 AWG wire (Dearborn #862205). Loop current is 20

mA nominal. Input and output logic supply voltages are

5 V dc.

Figure 18. Recommended Non-Isolated Active Transmitter with HCPL-4200 Isolated Receiver for Simplex Point-to-Point 20 mA Current Loop.

Figure 19. Minimum Required Supply Voltage, V

CC, vs.

Loop Length for Current Loop Circuit of Figure 19.

Figure 20. Typical Data Rate vs. Distance.

Full Duplex

The full duplex point-to-point communication of Figure

21 uses a four wire system to provide simultaneous, bi-

directional data communication between local and re-

mote equipment. The basic application uses two simplex

point-to-point loops which have two separate, active,

non-isolated units at one common end of the loops. The

other end of each loop is isolated.

As Figure 21 illustrates, the combination of Avago current

loop optocouplers, HCPL-4100 transmitter and HCPL-

4200 receiver, can be used at the isolated end of current

loops. Cross talk and common mode coupling are greatly

reduced when optical isolation is imple mented at the

same end of both loops, as shown. The full duplex data

rate is limited by the non-isolated active receiver current

loop. Comments mentioned under simplex conﬁgura-

tion apply to the full duplex case. Consult the HCPL-4100

transmitter opto coupler data sheet for speciﬁed device

performance.

Half Duplex

The half duplex conﬁguration, whether point-to-point

or multidrop, gives non-simultaneous bidirectional data

ﬂow from transmitters to receivers shown in Figures 22a

and 22b. This conﬁguration allows the use of two wires

to carry data back and forth between local and remote

units. However, protocol must be used to determine

which speciﬁc transmitter can operate at any given time.

Maximum data rate for a half duplex system is limited

by the loop current charging time. These considerations

were explained in the Simplex conﬁg ura tion section.

Figures 22a and 22b illustrate half duplex application

for the combination of HCPL-4100/-4200 optocouplers.

The unique and complementary designs of the HCPL-

4100 transmitter and HCPL-4200 receiver optocouplers

provide many designed-in beneﬁts. For example, total

optical isolation at one end of the current loop is eas-

ily accomplished, which results in substantial removal

Figure 21. Full Duplex Point-to-Point Current Loop System Conﬁguration.

Figure 22. Half Duplex Current Loop System Conﬁgurations for (a) Point-to-Point, (b) Multidrop.

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AV02-2353EN - February 8, 2010

of common mode inﬂuences, elimination of ground

potential diﬀerences and reduction of power supply re-

quirements. With this combination of HCPL-4100/-4200

optocouplers, speciﬁc current loop noise immunity is

provided, i.e., minimum SPACE state current noise im-

munity is 1 mA, MARK state noise immunity is 8 mA.

Voltage compliance of the current source must be of an

adequate level for operating all units in the loop while

not exceeding 27 V dc, the maximum breakdown voltage

for the HCPL-4100. Note that the HCPL-4100 transmitter

will allow loop current to conduct when input VCC power

is oﬀ. Consult the HCPL-4100 transmitter optocoupler

data sheet for speciﬁed device performance.

For more information about the HCPL-4100/-4200 opto-

couplers, consult Application Note 1018.