I believe the MJF 2955 and 3055 are the exact same die as in the original 2N2955 and 3055, in TO-220 rather than TO-3. The specs except for power dissipation should be the same - I hope that helps fill in the spec table.
I think any of these should be good subs for each other as long as the type (NPN/PNP) is right, the correct pinout is attainable, and the size is right - the high power hole needs bigger devices.
Since these are almost always used as power supply pass regulators for the plug-ins, what matters most is the DC-SOA ratings. The transistors in this size and rating class should be similar in that respect, but when in doubt, always consider the SOA graphs when comparing possible substitutes, versus the original designed-in parts. With the wide variety of plug-ins, it will be nearly impossible to predict tha actual DC operating condition limits, so use the original part SOA curve as the benchmark to be met or exceeded.
Ed
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--- In TekScopes@..., "Dennis Tillman" <dennis@...> wrote:
TEKTRONIX TM500/5000 MAINFRAME PASS TRANSISTORS
Compiled by Jerry Scheltgen and Dennis Tillman
Tek used at least 12 different pass transistor part numbers during
the time the TM500/5000 mainframes were in production. In some
cases different parts were used over certain serial number ranges.
The high power compartment (when present) used the higher current
transistors. Tek changed to different semiconductor families and/
or manufacturers (MFR####) over time.
Tek specified these parameters for the various part numbers used.
TEK PART TYPE MFR#### Ic BVceo PWR hFE@Ic VSat FtMIN CASE
-------- ---- ------- --- ----- ---- ------ ---- ----- ------
151-0140 NPN 2N3055H 15A 60V 115W 20@4A 1.1V .3MHz TO-3
151-0258 PNP 2N4905 15A 60V 87W 20@4A 3.V 4.MHz TO-3
151-0349 NPN MJE2801 10A 60V 90W 25@3A 2.MHz TO-127
151-0373 PNP MJE2901 10A 60V 90W 25@3A 2.MHz TO-127
151-0413 NPN 2N6258 30A 80V 250W 20@15A 3.V .8MHz TO-3
151-0436 NPN MJE2801 10A 85V 90W 25@3A 2.MHz TO-127
151-0651 PNP TIP36C 25A 100V 125W 10@15A 4.V 3.MHZ TO-218
151-0652 NPN TIP35C 25A 100V 125W 10@15A 4.V 3.MHZ TO-218
151-0917 NPN NO DATA
151-0918 PNP NO DATA
151-0937 NPN MJF3055 NO DATA TO-220
151-0938 PNP MJF2955 NO DATA TO-220
**
TM501
NPN 151-0349 (Select from MJE2801, MFR####: SJE924)
PNP 151-0373 (MFR####: SJE925)
**
TM501A
NPN 151-0349 (Select from MJE2801, MFR####: SJE924)
PNP 151-0373 (MFR####: SJE925)
**
TM502A
NPN 151-0436 (MFR####: SJE966, MJF3055), 151-0937 (MFR###: MJF3055)
PNP 151-0373 (SJE925 SEL VER), 151-0938 (MFG####: MJF2955)
**
TM503
NPN 151-0349 (SEL FROM MJE2801)
PNP 151-0373 (SJE925 SEL VER)
**
TM503A
NPN 151-0436 SJE966 SEL VER
PNP 151-0373 SJE925 SEL VER, MJF2955, 151-0938
**
TM503B
NPN 151-0937 MJF3055
PNP 151-0938 MJF2955
**
TM504 verify on later versions
NPN 151-0436, 151-0413 (OPTION 2 ONLY, 2N6258 HI PWR COMP)
151-0140 (STANDARD ONLY)
PNP 151-0373, SJ7028, 151-0258 (OLDER VER HI PWR COMP MJ2955)
**
TM504A
NPN NO DATA
PNP NO DATA
**
TM515
NPN 151-0436 TO-127 (Select from SJE966)
PNP 151-0373 TO-127 (SJE925)
**
TM506
NPN 151-0436, 151-0140
PNP 151-0373, 151-0258 (MFG####: MJ2955)
**
TM506A
NPN 151-0917, 151-0652 (MFG####: TIP35C)
PNP 151-0918, 151-0651 (MFG####: TIP36C)
**
TM5003
NPN 151-0436 (Select from SJE966), 151-0937 (MFG####: MJF3055)
PNP 151-0938 (MFG####: MJF2955), 151-0373 (MFG####: SJE925)
**
TM5006
NPN 151-0436 (Select from SJE966), 151-0140 (MFG####:SJ7020)
PNP 151-0373 (MFG####: SJE925), 151-0258
**
TM5006A
NPN 151-0937 (MFG####: MJF3055), 151-0652 (MFG####: TIP35C)
PNP 151-0938 (MFG####: MJF2955), 151-0651 (MFG####: TIP36C)
**
-30-
