Semiconductor Components Industries, LLC, 2001
May, 2001 – Rev. 1 1Publication Order Number:
BZX79C2V4RL/D
BZX79C2V4RL Series
500 mW DO-35 Hermetically
Sealed Glass Zener Voltage
Regulators
This is a complete series of 500 mW Zener diodes with limits and
excellent operating characteristics that reflect the superior capabilities
of silicon–oxide passivated junctions. All this in an axial–lead
hermetically sealed glass package that offers protection in all common
environmental conditions.
Specification Features:
Zener Voltage Range – 2.4 V to 33 V
ESD Rating of Class 3 (>16 KV) per Human Body Model
DO–204AH (DO–35) Package – Smaller than Conventional
DO–204AA Package
Double Slug Type Construction
Metallurgical Bonded Construction
Mechanical Characteristics:
CASE: Double slug type, hermetically sealed glass
FINISH: All external surfaces are corrosion resistant and leads are
readily solderable
MAXIMUM LEAD TEMPERATURE FOR SOLDERING PURPOSES:
230°C, 1/16 from the case for 10 seconds
POLARITY: Cathode indicated by polarity band
MOUNTING POSITION: Any
MAXIMUM RATINGS (Note 1.)
Rating Symbol Value Unit
Max. Steady State Power Dissipation
@ TL 75°C, Lead Length = 3/8
Derate above 75°C
PD500
4.0
mW
mW/°C
Operating and Storage
Temperature Range TJ, Tstg –65 to
+200 °C
1. Some part number series have lower JEDEC registered ratings.
Device Package Shipping
ORDERING INFORMATION
BZX79CxxxRL Axial Lead 5000/Tape & Reel
BZX79CxxxRL2* Axial Lead
AXIAL LEAD
CASE 299
GLASS
http://onsemi.com
5000/Tape & Reel
Cathode Anode
* The “2” suffix refers to 26 mm tape spacing.
L
79C
xxx
YWW
L = Assembly Location
79Cxxx = Device Code
= (See Table Next Page)
Y = Year
WW = Work Week
MARKING DIAGRAM
Zener Voltage Regulator
IF
V
I
IR
IZT
VR
VZVF
BZX79C2V4RL Series
http://onsemi.com
2
ELECTRICAL CHARACTERISTICS (TL = 30°C unless
otherwise noted, VF = 1.5 V Max @ IF = 100 mA for all types)
Symbol Parameter
VZReverse Zener Voltage @ IZT
IZT Reverse Current
ZZT Maximum Zener Impedance @ IZT
VBR Temperature Coefficient of VBR (Typical)
IRReverse Leakage Current (TA = 25°C) @ VR
VRBreakdown Voltage
IFForward Current
VFForward Voltage @ IF
CCapacitance (Typical)
ELECTRICAL CHARACTERISTICS (TL = 30°C unless otherwise noted, VF = 1.5 V Max @ IF = 100 mA for all types)
Zener Voltage (Note 3.) ZZT (Note 4.)
@I
Leakage Current VBR C
V 0
Device
Device
VZ (Volts) @ IZT
@ IZT
(f = 1.0 kHz) IR @ VRmV/CVZ = 0,
f = 1.0 MHz
D
ev
i
ce
(Note 2.)
D
ev
i
ce
Marking Min Nom Max mA µA Volts Min Max pF
BZX79C2V4RL 79C2V4 2.28 2.4 2.52 5 100 100 1 –3.5 0 255
BZX79C2V7RL 79C2V7 2.57 2.7 2.84 5 100 75 1 –3.5 0 230
BZX79C3V0RL 79C3V0 2.85 3.0 3.15 5 95 50 1 –3.5 0 215
BZX79C3V3RL 79C3V3 3.14 3.3 3.47 5 95 25 1 –3.5 0 200
BZX79C3V6RL 79C3V6 3.42 3.6 3.78 5 90 15 1 –3.5 0 185
BZX79C3V9RL 79C3V9 3.71 3.9 4.10 5 90 10 1 –3.5 0.3 175
BZX79C4V7RL 79C4V7 4.47 4.7 4.94 5 80 3 2 –3.5 0.2 130
BZX79C5V1RL 79C5V1 4.85 5.1 5.36 5 60 2 2 –2.7 1.2 110
BZX79C5V6RL 79C5V6 5.32 5.6 5.88 5 40 1 2 –2.0 2.5 95
BZX79C6V2RL 79C6V2 5.89 6.2 6.51 5 10 3 4 0.4 3.7 90
BZX79C6V8RL 79C6V8 6.46 6.8 7.19 5 15 2 4 1.2 4.5 85
BZX79C7V5RL 79C7V5 7.13 7.5 7.88 5 15 1 5 2.5 5.3 80
BZX79C8V2RL 79C8V2 7.79 8.2 8.61 5 15 0.7 5 3.2 6.2 75
BZX79C10RL 79C10 9.5 10 10.5 5 20 0.2 7 4.5 8.0 70
BZX79C12RL 79C12 11.4 12 12.6 5 25 0.1 8 6.0 10 65
BZX79C15RL 79C15 14.25 15 15.75 5 30 0.05 10.5 9.2 13 55
BZX79C16RL 79C16 15.2 16 16.8 5 40 0.05 11.2 10.4 14 52
BZX79C18RL 79C18 17.1 18 18.9 5 45 0.05 12.6 12.9 16 47
BZX79C22RL 79C22 20.9 22 23.1 5 55 0.05 15.4 16.4 20 34
BZX79C24RL 79C24 22.8 24 25.2 5 70 0.05 16.8 18.4 22 33
BZX79C27RL 79C27 25.65 27 28.35 5 80 0.05 18.9 23.5 30
BZX79C30RL 79C30 28.5 30 31.5 5 80 0.05 21 26 27
BZX79C33RL 79C33 31.35 33 34.65 5 80 0.05 23.1 29 25
2. TOLERANCE AND VOLTAGE DESIGNATION
Tolerance designation – the type numbers listed have zener voltage min/max limits as shown.
3. REVERSE ZENER VOLTAGE (VZ) MEASUREMENT
Reverse zener voltage is measured under pulse conditions such that TJ is no more than 2°C above TA.
4. ZENER IMPEDANCE (ZZ) DERIVATION
ZZT and ZZK are measured by dividing the ac voltage drop across the device by the ac current applied. The specified limits are for IZ(ac) =
0.1 IZ(dc) with the ac frequency = 1.0 kHz.
BZX79C2V4RL Series
http://onsemi.com
3
0.7
0.6
0.5
0.4
0.3
0.2
0.1
00 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, STEADY STATE
POWER DISSIPATION (WATTS)
BZX79C2V4RL Series
http://onsemi.com
4
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, as current crowding effects cause temperatures
to be extremely high in small spots, resulting in device
degradation should the limits of Figure 7 be exceeded.
LL
500
400
300
200
100
00 0.2 0.4 0.6 0.8 1
2.4-60V
62-200V
L, LEAD LENGTH TO HEAT SINK (INCH)
JL , JUNCTIONTOLEAD 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
70
50
20
10
7
5
2
1
0.7
0.5
0.2
0.1
0.07
0.05
0.02
0.01
0.007
0.005
0.002
0.001 3 4 5 6 7 8 910 1112131415
VZ, NOMINAL ZENER VOLTAGE (VOLTS)
I , LEAKAGE CURRENT ( A)µ
R
Figure 3. Typical Leakage Current
BZX79C2V4RL Series
http://onsemi.com
5
+12
+10
+8
+6
+4
+2
0
-2
-4 2345 678 9101112
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
70
50
30
20
10
7
5
3
2
1
2 3 4 5 6 7 8 9 10 11 12 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)
+6
+4
+2
0
-2
-4
3 4 56 78
VZ, ZENER VOLTAGE (VOLTS)
Figure 5. Effect of Zener Current
NOTE: BELOW 3 VOLTS AND ABOVE 8 VOLTS
NOTE: CHANGES IN ZENER CURRENT DO NOT
NOTE: AFFECT TEMPERATURE COEFFICIENTS
1mA
0.01mA
VZ@IZ
TA=25°C
1000
C, CAPACITANCE (pF)
500
200
100
50
20
10
5
2
1
1 2 5 10 20 50 100
VZ, ZENER VOLTAGE (VOLTS)
Figure 6a. Typical Capacitance 2.4–100 Volts
TA=25°C
0V BIAS
1V BIAS
50% OF
VZBIAS
100
70
50
30
20
10
7
5
3
2
1
120 140 160 180 190 200 220
VZ, ZENER VOLTAGE (VOLTS)
Figure 6b. Typical Capacitance 120–200 Volts
TA=25°C
1VOLTBIAS
50% OF VZBIAS
0 BIAS
θVZ, TEMPERATURE COEFFICIENT (mV/°C)
20mA
C, CAPACITANCE (pF) θVZ, TEMPERATURE COEFFICIENT (mV/°C)θVZ, TEMPERATURE COEFFICIENT (mV/°C)
θVZ, TEMPERATURE COEFFICIENT (mV/°C)
BZX79C2V4RL Series
http://onsemi.com
6
100
70
50
30
20
10
7
5
3
2
1
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
11V-91V NONREPETITIVE
1.8V-10V NONREPETITIVE
RECTANGULAR
WAVEFORM
TJ=25°C PRIOR TO
INITIAL PULSE
Figure 7a. Maximum Surge Power 1.8–91 Volts
1000
700
500
300
200
100
70
50
30
20
10
7
5
3
2
1
0.01 0.1 1 10 100 1000
Ppk , PEAK SURGE POWER (WATTS)
PW, PULSE WIDTH (ms)
Figure 7b. Maximum Surge Power DO-204AH
100–200 Volts
1000
500
200
100
50
20
10
1
2
5
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)
ZZ, DYNAMIC IMPEDANCE (OHMS)
1000
700
500
200
100
70
50
20
10
7
5
2
1
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. Typical Forward Characteristics
RECTANGULAR
WAVEFORM, TJ=25°C
100-200VOLTS NONREPETITIVE
TJ=25°C
iZ(rms)=0.1 IZ(dc)
f=60Hz
IZ=1mA
5mA
20mA
TJ=25°C
iZ(rms)=0.1 IZ(dc)
f=60Hz
VZ=2.7V
47V
27V
6.2V
VF, FORWARD VOLTAGE (VOLTS)
0.4 0.5 0.6 0.7 0.8 0.9 1 1.1
1000
500
200
100
50
20
10
5
2
1
IF, FORWARD CURRENT (mA)
MINIMUM
MAXIMUM
150°C
75°C
0°C
25°C
BZX79C2V4RL Series
http://onsemi.com
7
Figure 11. Zener Voltage versus Zener Current — VZ = 1 thru 16 Volts
VZ, ZENER VOLTAGE (VOLTS)
IZ, ZENER CURRENT (mA)
20
10
1
0.1
0.01
1 234 56 7 8910111213141516
TA=25°
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
10
1
0.1
0.01
TA=25°
IZ, ZENER CURRENT (mA)
BZX79C2V4RL Series
http://onsemi.com
8
Figure 13. Zener Voltage versus Zener Current — VZ = 30 thru 105 Volts
VZ, ZENER VOLTAGE (VOLTS)
10
1
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
10
1
0.1
0.01
TA=25°
65 105
IZ, ZENER CURRENT (mA)IZ, ZENER CURRENT (mA)
BZX79C2V4RL Series
http://onsemi.com
9
OUTLINE DIMENSIONS
500 mW DO–35 Glass
Zener Voltage Regulators – Axial Leaded
GLASS DO–35/D0–204AH
CASE 299–02
ISSUE A
NOTES:
1. PACKAGE CONTOUR OPTIONAL WITHIN A AND B
HEAT SLUGS, IF ANY, SHALL BE INCLUDED
WITHIN THIS CYLINDER, BUT NOT SUBJECT TO
THE MINIMUM LIMIT OF B.
2. LEAD DIAMETER NOT CONTROLLED IN ZONE F
TO ALLOW FOR FLASH, LEAD FINISH BUILDUP
AND MINOR IRREGULARITIES OTHER THAN
HEAT SLUGS.
3. POLARITY DENOTED BY CATHODE BAND.
4. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
All JEDEC dimensions and notes apply.
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A3.05 5.08 0.120 0.200
B1.52 2.29 0.060 0.090
D0.46 0.56 0.018 0.022
F--- 1.27 --- 0.050
K25.40 38.10 1.000 1.500
B
D
K
K
F
F
A
BZX79C2V4RL Series
http://onsemi.com
10
Notes
BZX79C2V4RL Series
http://onsemi.com
11
Notes
BZX79C2V4RL Series
http://onsemi.com
12
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty , representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
CENTRAL/SOUTH AMERICA:
Spanish Phone: 303–308–7143 (Mon–Fri 8:00am to 5:00pm MST)
Email: ONlit–spanish@hibbertco.com
Toll–Free from Mexico: Dial 01–800–288–2872 for Access –
then Dial 866–297–9322
ASIA/PACIFIC: LDC for ON Semiconductor – Asia Support
Phone: 1–303–675–2121 (Tue–Fri 9:00am to 1:00pm, Hong Kong Time)
Toll Free from Hong Kong & Singapore:
001–800–4422–3781
Email: ONlit–asia@hibbertco.com
JAPAN: ON Semiconductor, Japan Customer Focus Center
4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031
Phone: 81–3–5740–2700
Email: r14525@onsemi.com
ON Semiconductor Website: http://onsemi.com
For additional information, please contact your local
Sales Representative.
BZX79C2V4RL/D
NORTH AMERICA Literature Fulfillment:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada
Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada
Email: ONlit@hibbertco.com
Fax Response Line: 303–675–2167 or 800–344–3810 Toll Free USA/Canada
N. American Technical Support: 800–282–9855 Toll Free USA/Canada
EUROPE: LDC for ON Semiconductor – European Support
German Phone: (+1) 303–308–7140 (Mon–Fri 2:30pm to 7:00pm CET)
Email: ONlit–german@hibbertco.com
French Phone: (+1) 303–308–7141 (Mon–Fri 2:00pm to 7:00pm CET)
Email: ONlit–french@hibbertco.com
English Phone: (+1) 303–308–7142 (Mon–Fri 12:00pm to 5:00pm GMT)
Email: ONlit@hibbertco.com
EUROPEAN TOLL–FREE ACCESS*: 00–800–4422–3781
*Available from Germany, France, Italy, UK, Ireland