Product Overview
ON Semiconductor MJL21193 - TO-264 PNP BJT for Hi-Fi Amplifier Output Stages, 200W, Complementary to MJL21194
Condition
Unused NOS. Sourced from an electronics distributor consolidating inventory. Markings legible: MJL21193 and code CQ0633G confirmed on the black TO-264 body. Leads straight, body clean, no visible damage.
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Product Overview
ON Semiconductor MJL21193 - silicon PNP power bipolar junction transistor engineered for high-fidelity audio amplifier output stages. Rated 250V collector-emitter, 16A continuous collector current (25A peak), and 200W total power dissipation at 25°C. DC current gain (hFE) remains exceptionally linear from 1A to 8A, a characteristic that matters when accurate reproduction across the full dynamic range is the target. Complementary NPN partner is the MJL21194; the two are designed to be used together in push-pull output stages. Package is TO-264 (also cataloged as TO-3PBL).
Key Features
- Polarity: PNP silicon BJT
- Collector-emitter voltage (VCEO): 250V maximum
- Continuous collector current (IC): 16A; peak 25A
- Total power dissipation (PD): 200W at TC = 25°C
- DC current gain (hFE): 25 minimum at IC = 8A, VCE = 5V; linear from 1A to 8A
- Outstanding Safe Operating Area (SOA) robustness for demanding audio output duty
- Package: TO-264 / TO-3PBL - three straight leads, large metal tab for heatsink mounting
- Complementary NPN: MJL21194
- Also known as MJL21193G (Pb-Free / RoHS variant - functionally identical)
Applications
- Swapping a failed output transistor in a vintage stereo receiver or power amplifier - desolder the old device, drop this in, re-bias, and restore the amplifier to original performance without compromising gain linearity
- Building the push-pull output stage of a custom hi-fi power amplifier, paired with the MJL21194 NPN, where low harmonic distortion across the full collector current range defines the design goal
- Repairing a boutique bass head or stage power amplifier where a generic substitute would introduce distortion that the original design was tuned to avoid
- DIY audio projects - high-power amplifier builds from schematics or kits where the MJL21193 is specified by name and a substitute is not acceptable
- Experimenter use in high-voltage linear supply designs or other linear applications that benefit from the transistor's wide SOA and high voltage rating
Frequently Asked Questions
Does this come with the complementary MJL21194 NPN transistor?
This listing is for the MJL21193 PNP only. The MJL21194 is sold separately.
What heatsink is required?
A heatsink is required for any sustained power dissipation application. The TO-264 package uses a standard mounting tab - compatible with heatsinks designed for the TO-264 or TO-3PBL footprint. Thermal interface material between the tab and heatsink is strongly recommended.
Is this the same as the MJL21193G?
Yes. The MJL21193G designation indicates a Pb-Free, RoHS-compliant package. Electrical characteristics are identical to the MJL21193.
Can this replace a Motorola MJL21193?
ON Semiconductor acquired the Motorola semiconductor line. The MJL21193 is the same part continued under the ON Semiconductor brand - a direct replacement for Motorola-marked units of the same model number.
What PCB or heatsink footprint does the TO-264 use?
The TO-264 (TO-3PBL) is a three-lead package with leads on 5.45mm centers and a large mounting tab. Verify your PCB pad layout and heatsink hole pattern against the TO-264 mechanical specification before ordering if footprint fit is critical.
The output stage is where an amplifier either earns its reputation or quietly lets you down. The MJL21193 has been the honest answer in that slot for decades - put it where the work happens and let the music tell the rest of the story.
