
Solid State Devices, Inc.
14701 Firestone Blvd  *  La Mirada, Ca 90638 
Phone: (562) 404-4474  *  Fax: (562) 404-1773 
ssdi@ssdi-power.com  *  
www.ssdi-power.com
DESIGNER’S DATA SHEET
FEATURES:
Hermetically Sealed in Glass 
Axial Lead rated at 3 W 
Surface Mount rated at 4W 
Available Screening to TX, TXV, and Space Levels 
6/
Voltage Tolerances of 10% (A) and 5% (B) Available. 
Contact factory for other Voltage Tolerances 
Voltage Range from 7.5V to 510V. For Other Voltages, 
Contact Factory. 
NOTE:
  All specifications are subject to change without notification. 
SCD's for these devices should be reviewed by SSDI prior to release.
Maximum Ratings 
Symbol 
Value 
Units 
Nominal Zener Voltage
Maximum Zener Current
Forward Surge Current 
(8.3 msec Pulse)
V
Z
I
ZM
7.5 - 510 
400 - 6 
V 
mA 
I
FSM
8-0.04 
A 
Continuous 
Power 
L 
SM, SMS
P
D
3.0 
4.0 
W 
Operating and Storage 
Temp. 
Top 
&Tstg 
-65 to +175
oC 
Thermal Resistance, 
Junction to Lead, Axial, L=3/8
Junction to End Cap, SM, SMS 
Junction to Ambient
Part Number/Ordering Information 
7/
SZ3 
__
__
__
__
│
│
│
│
│
└
│
│
│
│
│
└
 Voltage/Family 
7.5
 thru 
510
 = 7.5V thru 510V 
(See Table 1)
└
 Voltage Tolerance  
A
  =  10% Voltage Tolerance   
B
  =  5% Voltage
│
└
G
  =  Glass Sleeve (Cylindrical Shape) 
F
  =  Frit Glass (Prolate Spheroid Shape)
R
θ
JL
R
θ
JE
R
θ
JA
42 
32 
50 
oC/W 
__
└
 Screening 
6/
__  
= Not Screened 
 TX   = TX Level 
 TXV = TXV 
S = S Level
 Package Type 
5/
 L 
= Axial Leaded 
SM
 = Surface Mount Round Tab 
SMS
 = Surface Mount Square Tab
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
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│
 Device Shape  
SZ3GA7.5 thru SZ3GB510 
and 
SZ3FA7.5 thru SZ3FB510 
3.0 W and 4.0 W 
7.5 – 510 VOLTS 
ZENER DIODES 
GLASS SLEEVE (G) 
MIN. 
--- 
--- 
.028” 
1.00” 
FRIT GLASS (F) 
MIN. 
--- 
--- 
.028” 
1.00” 
DIM 
A 
B 
C 
D 
MAX. 
.085” 
.170” 
.034” 
--- 
MAX. 
.145” 
.175” 
.034” 
--- 
AXIAL(L) 
5/
B
C
A     
GLASS SLEEVE (G) 
DIM 
A 
B 
C 
MIN 
.077” 
.130” 
.010” 
MAX 
.083” 
.146” 
.022” 
ROUND TAB (SM) 
5/
All dimensions are prior to soldering
GLASS SLEEVE 
(G) 
MIN. 
.090” 
.175” 
.022” 
.002” 
FRIT GLASS 
 (F) 
MIN. 
.145” 
.200” 
.022” 
.002” 
DIM 
A 
B 
C 
D 
MAX. 
.100” 
.215” 
.028” 
--- 
MAX. 
.155” 
.220” 
.028” 
--- 
SQUARE TAB (SMS) 
5/
All dimensions are prior to soldering
DATA SHEET #: Z00004F 
DOC