Product Overview
Raytheon REN129 PNP BJT – TO-39 Metal Can, 80V 1A, 1978 Production, Unused NOS
Condition
Unused NOS. Body markings legible: REN129 78, confirming a 1978 production date code. Three leads straight and intact. Light surface patina on the metal cap consistent with age. Sourced from an electronics distributor consolidating legacy inventory.
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Product Overview
Raytheon REN129 – PNP silicon bipolar junction transistor in a TO-39 metal can (TO-205AD) package. Rated 80V collector-emitter voltage, 1A continuous collector current, and 1.25W power dissipation. Designed for amplifier and switching applications. Recognized equivalents include the NTE129 and the 2N4037, though the 2N4037 carries a lower collector-emitter voltage rating than the REN129.
Key Features
- Polarity: PNP silicon BJT
- Collector-emitter voltage (VCEO): 80V
- Continuous collector current (IC): 1A
- Power dissipation: 1.25W
- Package: TO-39 metal can (TO-205AD), through-hole, three leads
- Date code 78 – 1978 production batch confirmed by molded body markings
- Recognized equivalents: NTE129 direct equivalent; 2N4037 cross (note: 2N4037 VCEO is lower – verify before substituting)
Applications
- Replacing a failed PNP output stage or driver transistor in a vintage Marantz, Sansui, Pioneer, or Kenwood amplifier – desoldering the original TO-39 part and dropping the REN129 in for a period-correct restoration
- Swapping a faulty switching transistor in legacy industrial control circuitry – relay driver, sensor interface, or low-power switching stage – without redesigning the board
- Breadboarding a complementary-pair amplifier stage alongside an NPN counterpart, taking advantage of the TO-39 body for easier handling and re-use compared to surface-mount devices
- Driving a relay or switching a load in a hobbyist project where a robust through-hole PNP with a metal can package handles moderate heat better than small plastic packages
Frequently Asked Questions
Is the REN129 a direct drop-in for the NTE129?
Yes. The NTE129 is the direct equivalent to the REN129. Both are PNP silicon BJTs in TO-39 packages rated at 80V and 1A.
Can I use the 2N4037 as a substitute?
The 2N4037 is a recognized cross-reference, but its collector-emitter voltage rating is lower than the REN129's 80V. If your circuit operates well within that lower threshold, the 2N4037 may work. If your circuit requires the full 80V headroom, the REN129 is the correct choice.
What is the pinout for the TO-39 package?
The standard TO-39 PNP pinout – looking at the bottom of the can with the tab as a reference – is Emitter, Base, Collector. Confirm against your circuit's original part before soldering.
Is anything else included with the transistor?
The transistor only. No documentation or accessories are included.
A Raytheon-branded TO-39 from 1978 has outlasted the equipment it was made for – and it still has a job to do the moment you put it in a circuit that needs exactly this part.
