onsemi MJE180PWD

Overview

MJE180PWD from ON Semiconductor is a low-power NPN epitaxial silicon transistor designed for audio amplifier stages and high-speed switching applications, featuring 40 V V_CEO, 60 V V_CBO, 3 A DC collector current, 12.5 W power dissipation at T_C=25°C, and 50 MHz transition frequency - deployed in consumer audio preamplifiers and relay driver circuits.

For engineers reviewing the MJE180PWD datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) ≤ 1.7 V at 3 A, h_FE ≥ 12 at 1.5 A, TO-126 package thermal performance, and safe operating area compliance up to 100 µs pulse width.

Technical Context

The MJE180PWD operates as a general-purpose bipolar junction transistor with fixed-emitter configuration and base-controlled current amplification. Its design supports linear amplification (h_FE = 50–250 at I_C = 100 mA) and saturated switching (V_CE(sat) = 0.3 V at I_C = 500 mA, I_B = 50 mA), with junction temperature limited to 150°C and storage range from –65°C to +150°C.

It exhibits 30 pF output capacitance at V_CB = 10 V and f = 0.1 MHz, enabling stable operation in low-frequency (<50 MHz) analog and digital switching circuits. The device's Cob and f_T values confirm suitability for audio-band amplification and <100 kHz switching without parasitic oscillation risk.

Key Specifications

Pinout & Package

Package: TO-126 - Three-lead plastic power package with integral metal tab for mechanical mounting and thermal conduction; lead pitch 2.28 mm, body height 14.20 mm max, tab diameter ø3.20 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power transistor applications.

Compared with 2N3055 and TIP31C, the MJE180PWD delivers superior high-frequency response and tighter h_FE tolerance at mid-currents, making it optimal for audio fidelity and fast-switching applications where TO-126 thermal performance and 50 MHz bandwidth are decisive.

Availability

MJE180PWD is available at Aetrix Electronics and suitable for audio preamplifiers, relay driver circuits, and DC motor speed controllers requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for MJE180PWD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MJE180PWD belongs to ON Semiconductor's legacy power bipolar transistor portfolio, originally developed by Fairchild for cost-sensitive, thermally constrained linear and switching applications in consumer and industrial electronics.

FAQ

What is the maximum safe operating voltage for MJE180PWD in common-emitter configuration?

The MJE180PWD has a guaranteed V_CEO rating of 40 V at T_C = 25°C, meaning it can safely withstand up to 40 V between collector and emitter with base open. Derating applies above 25°C case temperature per the published power derating curve; operation above 40 V risks avalanche breakdown and permanent damage. Always verify voltage margins in the final circuit using worst-case analysis for the MJE180PWD.

Does MJE180PWD support linear amplification, and what h_FE range should be used for bias design?

Yes, the MJE180PWD is specified for linear amplification with h_FE = 50–250 at V_CE = 1 V and I_C = 100 mA, and h_FE ≥ 12 at I_C = 1.5 A. For robust Class-A preamp biasing, use h_FE = 50 as the minimum design value to ensure sufficient base drive across process and temperature variation. The MJE180PWD's gain consistency supports predictable quiescent point stability.

What is the thermal resistance from junction to case (R_θJC) for MJE180PWD, and how does it affect heatsink selection?

The MJE180PWD in TO-126 package has R_θJC = 10°C/W, derived from its 12.5 W P_C rating at T_C = 25°C (ΔT = P × R_θJC). To maintain T_J ≤ 150°C at 5 W dissipation, the case temperature must stay ≤ 100°C, requiring a heatsink with R_θCA ≤ 10°C/W when ambient is 50°C. This thermal profile makes the MJE180PWD suitable for moderate-power applications without oversized heatsinks.

Can MJE180PWD replace MJE181 or MJE182 in existing designs?

No - the MJE180PWD is electrically distinct from MJE181 (V_CEO = 60 V) and MJE182 (V_CEO = 80 V); substituting it into circuits designed for higher breakdown voltages risks catastrophic failure. While all three share TO-126 packaging and pinout, the MJE180PWD's 40 V V_CEO limit must be verified against actual collector swing in the target application before integration.

Is MJE180PWD suitable for PWM switching at 20 kHz, and what limits its high-frequency performance?

Yes, the MJE180PWD supports 20 kHz PWM switching due to its 50 MHz f_T and low C_ob (30 pF), but switching losses increase above 50 kHz due to finite minority-carrier lifetime and lack of optimized charge storage specs. For reliable 20 kHz operation, ensure base drive strength (I_B ≥ 150 mA peak) and minimize trace inductance; the MJE180PWD's V_CE(sat) and SOA remain valid within this range.