Manufacturer Part Number

MJ11021

Description

This is a PNP Darlington power transistor for high-current switching and amplification. It operates at 250V maximum collector-emitter voltage and can handle up to 15A collector current. It comes in a TO-204 (TO-3) metal case package and dissipates up to 175W power. The transistor is through-hole mounted, suitable for reliable mechanical fixing and heat transfer. Obsolete in production but available in inventory.

Specifications

Transistor type: PNP - Darlington

Maximum collector current: 15A

Maximum collector-emitter voltage: 250V

Saturation voltage (Vce Sat): 3.4V @ 150mA base current, 15A collector current

Collector cutoff current: 1mA

DC current gain (hFE): Minimum 400 @ 10A collector current, 5V collector-emitter voltage

Maximum power dissipation: 175W

Operating junction temperature: -65°C to 200°C

Mounting: Through hole

Package: TO-204AA / TO-3

RoHS status: Non-compliant

Moisture sensitivity: Level 1 (unlimited)

REACH status: Unaffected

Device Structure

Uses Darlington pair configuration for high amplification. The assembly is in a robust TO-3 metal can which allows better heat dissipation and mechanical strength. It is designed for through-hole mounting, making it suitable for heavy-duty and industrial applications.

Performance Characteristics

High current capability up to 15A.

High voltage tolerance up to 250V.

High power dissipation (175W) for demanding loads.

Very high current gain (hFE ≥ 400) for efficient switching.

Operates reliably in a wide temperature range.

Saturation voltage is moderately low for its class.

Application Environments

Used in audio amplifiers, power supply regulation, DC motor control, relay drivers, and industrial switching systems. Suitable for equipment requiring high current and power. Applicable in demanding environments due to robust package and wide operating temperature range.

Selection Guidelines

Check if a PNP Darlington transistor in TO-3/TO-204 package meets your power, voltage, and current requirements. Ensure proper heatsinking due to high power dissipation. MJ11021 is best for legacy designs or direct replacements where exact specifications are required. Verify RoHS compliance for your application; this device is non-compliant.

Usage Considerations

Ensure adequate heatsink for up to 175W dissipation.

Obsolete part, so confirm availability in quantity if used for production.

TO-3 package requires compatible socket or mounting hardware.

High current and voltage operation calls for safe layout and handling to avoid electrical hazards.

Not compliant with RoHS environmental standards—important for certain regulated markets.

Potential Equivalent/Replacement Models

MJ11021G is listed as a substitute with similar key parameters.

Possible equivalents include: MJ11020, MJ11023 (onsemi), 2N6287, 2N6286 (other manufacturers) — cross-check exact specifications before use.

If no direct or suitable equivalent is found, contact Ariat-Tech sales team for help finding alternatives or further recommendations.

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