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MIL-PRF-19500-426 Semiconductor Device, Transistor, Pnp, Silicon, Amplifier Type 2N4957 And 2N4957Ub, Jan, Jantx, Jantxv, Jantxvm, Jantxvd, Jantxvp, Jantxvl, Jantxvr, Jantxvf, Jantxvg, Jantxvh, Jans, Jansm, Jansd, Jansp, Jansl, Jansr, Jansf, Jansg, Jansh, Janhc, Janhcm, Janhcd, Janhcp, Janhcl, Janhcr, Janhcf, Janhcg, Janhch, Jankc, Jankcm, Jankcd, Jankcp, Jankcl, Jankcr, Jankcf, Jankcg, ...This specification covers the performance requirements for PNP silicon, VHF-UHF amplifier transistors. Four levels of product assurance are provided for each device type as specified in MIL-PRF-19500. Two levels of product assurance are provided for each unencapsulated device type. Radiation hardness assurance \(RHA\) level designators "M", "D", "P", "L", "R", "F", "G", and "H" are appended to the device prefix to identify devices which have passed RHA requirements.

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MIL-PRF-19500/426H
Symbol
Dimensions
Notes
Inches
Millimeters
Min
Max
Min
Max
CD
.178
.195
4.52
4.95
5
CH
.170
.210
4.32
5.33
HD
.209
.230
5.31
5.84
5
LC
.100 TP
2.54 TP
LD
.016
.021
0.41
0.533
7,8
LL
.500
.750
12.70
19.05
7,8
LU
.016
.019
0.41
0.48
7,8
.050
1 .27
8
L1
.250
6.35
8
L2
P
.100
2.54
Q
.050
1.27
5
r
.007
0.18
TL
.028
.048
0.71
1.22
TW
.036
.046
0.91
1.17
α
45° TP
45° TP
NOTES:
1. Dimension are in inches.
2. Millimeters are given for general information only.
3. Beyond r (radius) maximum, TH shall be held for a minimum length of .011 (0.28 mm).
4. Dimension TL measured from maximum HD.
5. Body contour optional within zone defined by HD, CD, and Q.
6. Leads at gauge plane .054 +.001 -.000 inch (1.37 +0.03 -0.00 mm) below seating plane shall be within .007
inch (0.18 mm) radius of true position (TP) at maximum material condition (MMC) relative to tab at MMC.
The device may be measured by direct methods.
7. Dimension LU applies between L1 and L2. Dimension LD applies between L2 and LL minimum. Diameter is
uncontrolled in L1 and beyond LL minimum.
8. All four leads.
9. Dimension r (radius) applies to both inside corners of tab.
10. In accordance with ASME Y14.5M, diameters are equivalent to φx symbology.
11. Lead 1 = emitter, lead 2 = base, lead 3 = collector, lead 4 = case (electrically connected).
FIGURE 1. Physical dimensions of transistor type 2N4957 (TO-72) Continued.
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