BZX55B18RL2 - Tak Cheong Electronics (Holdings) Co., Ltd.

December 2005 / B http://takcheong.com

Licensed by ON Semiconductor,

A trademark of semiconductor

Components Industries, LLC for

Zener Technology and Products.

TAK CHEON

500 mW DO-35 Hermetically

Sealed Glass Zener Voltage

Regulators

Maximum Ratings (Note 1)

Rating Symbol Value Units

Maximum Steady State Power Dissipation

@TL≤75℃, Lead Length = 3/8”

Derate Above 75℃

500

4.0

mW/℃

Operating and Storage

Temperature Range TJ, Tstg -65 to +200 °C

Note 1: Some part number series have lower JEDEC registered ratings.

Specification Features:

 Zener Voltage Range = 2.4V to 91V

 ESD Rating of Clas 3 (>6 KV) per Human Body Model

 DO-35 Package (DO-204AH)

 Double Slug Type Construction

 Metallurgical Bonded Construction

Specification Features:

Case : Double slug type, hermetically sealed glass

Finish : All external surfaces are corrosion resistant and leads are readily solderable

Polarity : Cathode indicated by polarity band

Mounting: Any

Maximum Lead Temperature for Soldering Purposes

230℃, 1/16” from the case for 10 seconds

Ordering Information

Device Package Quantity

BZX55Cxxx Axial Lead 3000 Units / Box

BZX55CxxxRL Axial Lead 5000 Units / Tape & Reel

BZX55CxxxRL2* Axial Lead 5000 Units / Tape & Reel

BZX55CxxxRR1 ! Lead Form 3000 Units / Radial Tape & Reel

BZX55CxxxRR2 i Lead Form 3000 Units / Radial Tape & Reel

BZX55CxxxTA Axial Lead 5000 Units / Tape & Ammo

BZX55CxxxTA2* Axial Lead 5000 Units / Tape & Ammo

BZX55CxxxRA1 ! Axial Lead 3000 Units / Radial Tape & Ammo

BZX55CxxxRA2 i Axial Lead 3000 Units / Radial Tape & Ammo

* The “2” suffix refer to 26mm tape spacing.

! “1”: Polarity band up with cathode lead off first.

i “2”: Polarity band down with cathode lead off first.

BZX55C2V4 through BZX55C91 Series

Cathode Anode

L = Logo

79Cxxx = BZX79Cxxx Device Code

55C

xxx

Devices listed in bold italic are Tak Cheong Preferred

devices. Preferred devices are recommended choices

for future use and best overall value.

AXIAL LEAD

DO35

BZX55C2V4 through BZX55C91 Series

http://www.takcheong.com

ELECTRICAL CHARACTERISTICS (TA = 25ºC unless

otherwise noted. VF = 1.3 V Max @ IF = 100mA for all types)

Symbol Parameter

VZReverse Zener Voltage @ IZT

IZT Reverse Zener Current

ZZT Maximum Zener Impedance @ IZT

IZM Maximum DC Zener Current

IRReverse Leakage Current @ VR

VRReverse Voltage

IFForward Current

VFForward Voltage @ IF

ELECTRICAL CHARACTERISTICS (TA = 25ºC unless otherwise noted, VF = 1.3 V Max @ IF = 100mA for all types)

Max Reverse

Leakage Current

IR at VR

VZT @ IZT

(Volts)

(Note 2.)

Max Zener

Impedance

(Note 4)

ZZT @ IZT IZT

Tamb

25°

°°

°CTamb

125°

°°

°CVR

IZM

(Note 3.)

Device Device

Marking Min Max (Ω

ΩΩ

Ω)(mA)(

µµ

µA) (µ

µµ

µA) (Volts) (mA)

BZX55C2V4 55C2V4 2.28 2.56 85 5 50 100 1 155

BZX55C2V7 55C2V7 2.5 2.9 85 5 10 50 1 135

BZX55C3V0 55C3V0 2.8 3.2 85 5 4 40 1 125

BZX55C3V3 55C3V3 3.1 3.5 85 5 2 40 1 115

BZX55C3V6 55C3V6 3.4 3.8 85 5 2 40 1 105

BZX55C3V9 55C3V9 3.7 4.1 85 5 2 40 1 95

BZX55C4V3 55C4V3 4 4.6 75 5 1 20 1 90

BZX55C4V7 55C4V7 4.4 5 60 5 0.5 10 1 85

BZX55C5V1 55C5V1 4.8 5.4 35 5 0.1 c 1 80

BZX55C5V6 55C5V6 5.2 6 25 5 0.1 2 1 70

BZX55C6V2 55C6V2 5.8 6.6 10 5 0.1 2 2 64

BZX55C6V8 55C6V8 6.4 7.2 8 5 0.1 2 3 58

BZX55C7V5 55C7V5 7 7.9 7 5 0.1 2 5 53

BZX55C8V2 55C8V2 7.7 8.7 7 5 0.1 2 6 47

BZX55C9V1 55C9V1 8.5 9.6 10 5 0.1 2 7 43

BZX55C10 55C10 9.4 10.6 15 5 0.1 2 7.5 40

BZX55C11 55C11 10.4 11.6 20 5 0.1 2 8.5 36

BZX55C12 55C12 11.4 12.7 20 5 0.1 2 9 32

BZX55C13 55C13 12.4 14.1 26 5 0.1 2 10 29

BZX55C15 55C15 13.8 15.6 30 5 0.1 2 11 27

2. TOLERANCE AND VOLTAGE DESIGNATION (VZt)

Tolerance designation – the type numbers listed have zener voltage min/max limits as shown. Device tolerance of ±2% are

Indicated by a “B” instead of a “C”. Zener voltage is measured with the device junction thermal equilibri um at the temperature

of 30°C ±1°C and 3/8” lead length.

3. MA XIMUM ZENER CURRENT RATINGS (IZM)

This data was calculated using nominal voltages. The maximum current handling capability on a worst case basis is limited

by the actual zener voltage at the operation point and the power derating curve.

4. ZENER IMPEDANCE (ZZ) DERIVATION

ZZT and ZZK are measured by dividing the AC voltage drop across the device by the AC current appl i ed. The specified l imits

are for IZ(AC) = 0.1 IZ(DC) with AC frequenc y = 60Hz.

BZX55C2V4 through BZX55C91 Series

http://www.takcheong.com

ELECTRICAL CHARACTERISTICS (TA = 25ºC unless otherwise noted, VF = 1.3 V Max @ IF = 100mA for all types)

Max Reverse

Leakage Current

IR at VR

VZT @ IZT

(Volts)

(Note 5.)

Max Zener

Impedance

(Note 7)

ZZT @ IZT IZT

Tamb

25°

°°

°CTamb

125°

°°

°CV

IZM

(Note 6.)

Device Device

Marking Min Max (Ω

ΩΩ

Ω)(mA)(

µµ

µA) (µ

µµ

µA) (Volts) (mA)

BZX55C16 55C16 15.3 17.1 40 5 0.1 2 12 24

BZX55C18 55C18 16.8 19.1 50 5 0.1 2 14 21

BZX55C20 55C20 18.8 21.1 55 5 0.1 2 15 20

BZX55C22 55C22 20.8 23.3 55 5 0.1 2 17 18

BZX55C24 55C24 22.8 25.6 80 5 0.1 2 18 16

BZX55C27 55C27 25.1 28.9 80 5 0.1 2 20 14

BZX55C30 55C30 28 32 80 5 0.1 2 22 13

BZX55C33 55C33 31 35 80 5 0.1 2 24 12

BZX55C36 55C36 34 38 80 5 0.1 2 27 11

BZX55C39 55C39 37 41 90 2.5 0.1 5 28 10

BZX55C43 55C43 40 46 90 2.5 0.1 5 32 9.2

BZX55C47 55C47 44 50 110 2.5 0.1 5 35 8.5

BZX55C51 55C51 48 54 125 2.5 0.1 10 38 7.8

BZX55C56 55C56 52 60 135 2.5 0.1 10 42 7

BZX55C62 55C62 58 66 150 2.5 0.1 10 47 6.4

BZX55C68 55C68 64 72 160 2.5 0.1 10 51 5.9

BZX55C75 55C75 70 80 170 2.5 0.1 10 56 5.3

BZX55C82 55C82 77 87 200 2.5 0.1 10 62 4.8

BZX55C91 55C91 85 96 250 1 0.1 10 69 4.3

5. TOLERANCE AND VOLTAGE DESIGNATION (VZt)

Tolerance designation – the type numbers listed have zener voltage min/ max limits as shown. Device tolerance of ±2% are

Indicated by a “B” instead of a “C”. Zener voltage is measured with the device junction thermal equilibri um at the temperature

of 30°C ±1°C and 3/8” lead length.

6. MA XIMUM ZENER CURRENT RATINGS (IZM)

This data was calculated using nominal voltages. The maximum current handling capability on a worst case basis is limited

by the actual zener voltage at the operation point and the power derating curve.

7. ZENER IMPEDANCE (ZZ) DERIVATION

ZZT and ZZK are measured by dividing the AC voltage drop across the device by the AC current appl i ed. The specified l imits

are for IZ(AC) = 0.1 IZ(DC) with AC frequenc y = 60Hz.

BZX55C2V4 through BZX55C91 Series

http://www.takcheong.com

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0 20 40 60 80 100 120 140 160 180 200

TL, LEAD TEMPERATURE (°C)

Figure 1. Steady State Power Derating

HEAT

SINKS

3/8" 3/8"

PD, MAXIMUM STEADY STATE

POWER DISSIPATION (WATTS)

BZX55C2V4 through BZX55C91 Series

http://www.takcheong.com

APPLICATION NOTE - ZENER VOLTAGE

Since the actual voltage available from a given zener

diode is temperature dependent, it is necessary to determine

junction temperature under any set of operating conditions

in order to calculate its value. The following procedure is

recommended:

Lead Temperature, TL, should be determined from:

TL = θLAPD + TA.

θLA is the lead-to-ambient thermal resistance (°C/W) and PD

is the power dissipation. The value for θLA will vary and

depends o n the device mounting method. θLA is generally 30

to 40°C/W for the various clips and tie points in common use

and for printed circuit board wiring.

The temperature of the lead can also be measured using a

thermocouple placed on the lead as close as possible to the

tie point. The thermal mass connected to the tie point is

normally large enough so that it will not significantly

respond to heat surges generated in the diode as a result of

pulsed operation once steady-state conditions are achieved.

Using the measured value of TL, the junction temperature

may be determined by:

TJ = TL + ∆TJL.

∆TJL is the increase in junction temperature above the lead

temperature and may be found from Figure 2 for dc power:

∆TJL = θJLPD.

For worst-case design, using expected limits of IZ, limits

of PD and the extremes of TJ(∆TJ) may be estimated.

Changes in voltage, VZ, can then be found from:

∆V = θVZTJ.

θVZ, the zener voltage temperature coefficient, is found

from Figures 4 and 5.

Under high power -pulse operation, the zener voltage will

vary with time and may also be affected significantly by the

zener resistance. For best regulation, keep current

excursions as low as possible.

Surge limitations are given in Figure 7. They are lower

than would be expected by considering only junction

temperature, a s current crowding ef fects cause temperatures

to be extremely high in small spots, resulting in device

degradation should the limits of Figure 7 be exceeded.

500

400

300

200

100

0 0.2 0.4 0.6 0.8 1

2.4-60 V

62-200V

L , LEAD LENGTH TO HEAT SINK (INCH)

JL, JUNCTION TOLEAD THERMAL RESISTANCE(°C/W)θ

Figure 2. Typical Thermal Resistance

TYPICAL LEAKAGE CURRENT

AT 80% OF NOMINAL

BREAKDOWN VOLTAGE

+25°C

+125°C

1000

7000

5000

2000

1000

700

500

200

100

0.7

0.5

0.2

0.1

0.07

0.05

0.02

0.01

0.007

0.005

0.002

0.001

34 5 6 7 8 9101112

VZ , NOMINAL ZENER VOLTAGE (VOLTS)

I, LEAKAGE CURRENT ( A)µR

Figure 3. Typical Leakage Current

13 14 15

BZX55C2V4 through BZX55C91 Series

http://www.takcheong.com

+12

+10

-2

-4

VZ , ZENER VOLTAGE (VOLTS)

Figure 4a. Range for Units to 12 Volts

VZ@IZT

(NOTE 2)

RANGE

TEMPERATURE COEFFICIENTS

(-55°C to +150°C temperature range; 90% of the units are in the ranges indicated.)

100

26 10 20 30 50 70 100

VZ , ZENER VOLTAGE (VOLTS)

Figure 4b. Range for Units 12 to 100 Volts

RANGE VZ@IZ(NOTE 2)

120 130 140 150 160 170 180 190 200

200

180

160

140

120

100

VZ , ZENER VOLTAGE (VOLTS)

Figure 4c. Range for Units 120 to 200 Volts

VZ @ IZT

(NOTE 2)

-2

-4

VZ , ZENER VOLTAGE (VOLTS)

Figure 5. Effect of Zener Current

NOTE: BELOW 3 VOLTS AND ABOVE 8 VOL TS

NOTE: CHANGES IN ZENER CURRENT DO NOT

NOTE: AFFECT TEMPERATURE COEFFICIENTS

1mA

0.01mA

VZ @ IZ

TA=25 °C

1000

C, CAP ACIT ANCE (pF)

500

200

100

1 2 5 10 20 50 100

VZ, ZENER VOLTAGE (VOLTS)

Figure 6a. Typical Capacitance 2.4-100 Volts

TA = 25°C

0V BIAS

1V BIAS

50% OF

VZBIAS

100

120 140 160 180 190 200 220

VZ, ZENER VOLTAGE (VOLTS)

Figure 6b. Typical Capacitance 120-200 Volts

T= 25 °C

1 VOLT BIAS

50% OF V BIAS

0 BIAS

θVZ

TEMPERA TURE COEFFICIENT (mV/ °C)

20mA

C, CAP ACIT ANCE (pF) θVZ

TEMPERATURE COEFFICIENT (mV/ °C)θVZ

TEMPERATURE COEFFICIENT (mV/°C)

θVZ, TEMPERA TURE COEFFICIENT (mV/°C)

345 710

11 12

5678

BZX55C2V4 through BZX55C91 Series

http://www.takcheong.com

100

0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 10 20 50 100 200 500 1000

Ppk , PEAK SURGE POWER (WATTS)

PW, PULSE WIDTH (ms)

5% DUTY CYCLE

10% DUTY CYCLE

20% DUTY CYCLE

11V-91V NONREPETITIVE

1.8V-10V NONREPETITIVE

RECT ANGULAR

WAVEFORM

TJ= 25°C PRIOR TO

INITIAL PULSE

Figure 7a. Maximum Surge Power 1.8-91 Volts

1000

700

500

300

200

100

0.01 0.1 1 10 100 1000

Ppk , PEAK SURGE POWER (WATTS)

PW, PULSE WIDTH (ms)

Figure 7b. Maximum Surge Power DO-35

100-200Volts

1000

500

200

100

0.1 0.2 0.5 1 2 5 10 20 50 100

IZ , ZENER CURRENT (mA)

Figure 8. Effect of Zener Current on

Zener Impedance

ZZ, DYNAMIC IMPEDANCE (OHMS)

1000

700

500

200

100

1 2 3 5 7 10 20 30 50 70 100

VZ, ZENER VOLTAGE (VOLTS)

Figure 9. Effect of Zener Voltage on Zener Impedance Figure 10. T ypical Forward Characteristics

RECT ANGULAR

WAVEFORM, TJ = 25°C

100-200VOLTS NONREPETITIVE

TJ= 25°C

iZ (rms) = 0.1 IZ (dc)

f = 60Hz

IZ=1mA

5mA

20mA

TJ= 25°C

iZ(rms)=0.1 Iz(dc)

f = 60 Hz

VZ = 2.7V

47V

27V

6.2V

VF, FOR WARD VOLTAGE (VOLTS)

0.4 0.5 0.6 0.7 0.8 0.9 1 1.1

1000

500

200

100

IF, FOR WARD CURRENT (mA)

MINIMUM

MAXIMUM

150 °C

75°C

0°C

25°C

BZX55C2V4 through BZX55C91 Series

http://www.takcheong.com

Figure 1 1. Zener Voltage versus Zener Current - VZ = 1 thru 16 Volts

VZ, ZENER VOLTAGE (VOLTS)

IZ, ZENER CURRENT (mA)

0.1

0.01

12 5 78910111213141516

TA= 25°C

Figure 12. Zener Voltage versus Zener Current - VZ = 15 thru 30 Volts

VZ , ZENER VOLTAGE (VOLTS)

15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

0.1

0.01

TA= 25°C

IZ, ZENER CURRENT (mA)

BZX55C2V4 through BZX55C91 Series

http://www.takcheong.com

Figure 13. Zener Voltage versus Zener Current - VZ = 30 thru 105 Volts

VZ , ZENER VOLTAGE (VOLTS)

0.1

0.01

30 35 40 45 50 55 60 70 75 80 85 90 95 100

Figure 14. Zener Voltage versus Zener Current - VZ = 110 thru 220 Volts

VZ, ZENER VOLTAGE (VOLTS)

110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260

0.1

0.01

TA= 25°

65 105

IZ, ZENER CURRENT (mA)IZ, ZENER CURRENT (mA)