onsemi MPSA56RLRAG

Overview

MPSA56RLRAG from ON Semiconductor is a PNP general-purpose amplifier transistor designed for linear amplification and switching in low-to-medium power analog circuits, with V_CEO = −60 V, I_C = −500 mA, h_FE ≥ 100 at I_C = −10 mA, V_CE(sat) ≤ −0.25 V, and f_T = 50 MHz - commonly deployed in audio preamplifier stages, relay drivers, and discrete logic level translation.

For engineers reviewing the MPSA56RLRAG datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (SOT-293/TO-92 variant), confirmed DC and small-signal parameters, thermal derating data, and two validated alternative parts for design continuity and sourcing flexibility.

Technical Context

The MPSA56RLRAG operates as a silicon PNP bipolar junction transistor optimized for general-purpose linear amplification and saturated switching. Its structure supports continuous collector current up to −500 mA with guaranteed DC current gain (h_FE) of 100–300 at I_C = −10 mA and V_CE = −1 V, and exhibits f_T = 50 MHz under standard test conditions (I_C = −10 mA, V_CE = −2 V).

It features V_CEO = −60 V, V_CB0 = −80 V, and V_EB0 = −4.0 V, enabling robust operation in negative-rail bias configurations. Thermal resistance R_θJA is 200 °C/W on FR-4 PCB, with total device dissipation rated at 625 mW at T_A = 25 °C and derated by 5.0 mW/°C above that temperature.

Key Specifications

Pinout & Package

Package: TO-92 (SOT-293), 3-lead molded plastic case with straight leads. Standard JEDEC TO-92 outline; lead finish is matte tin over nickel.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose amplifier applications.

Compared with MPSA56RLRAG, MPSA55RLRAG offers lower gain headroom at medium currents, while BC557BTA trades voltage rating for higher f_T - making MPSA56RLRAG the optimal balance of voltage robustness, gain stability, and thermal performance in −60 V, ≤500 mA applications.

Availability

MPSA56RLRAG is available at Aetrix Electronics and suitable for audio signal conditioning, electromechanical actuation, level translation, and negative-rail power switching requiring stable component supply and long-term manufacturability.

Supply support for MPSA56RLRAG 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, and discrete components for automotive, industrial, and consumer applications.

The MPSA56RLRAG belongs to ON Semiconductor's legacy general-purpose bipolar transistor family, engineered for reliability and consistency in discrete amplifier and switching circuits across industrial and commercial electronics.

FAQ

What is the absolute maximum collector-emitter voltage rating for MPSA56RLRAG?

The absolute maximum V_CEO for MPSA56RLRAG is −60 V at T_A = 25 °C. This rating defines the upper limit of reverse-biased voltage the transistor can withstand before breakdown. Exceeding this value risks permanent damage. The MPSA56RLRAG must be operated within this limit in all circuit configurations, including those with inductive kickback or transient overshoot.

Does MPSA56RLRAG have a documented h_FE range at I_C = −100 mA?

Yes - the MPSA56RLRAG datasheet specifies h_FE ≥ 100 at I_C = −100 mA and V_CE = −1 V. This minimum gain ensures predictable base drive requirements in medium-current switching applications. The typical h_FE at this condition is approximately 200, supporting robust operation across process variation.

Can MPSA56RLRAG replace MPSA55RLRAG in an existing design without layout changes?

Yes - MPSA56RLRAG shares identical TO-92 packaging, pinout (E-B-C), and mechanical footprint with MPSA55RLRAG. However, its higher guaranteed h_FE at medium currents and identical V_CEO make it a functional upgrade. No PCB changes are required, but verify base resistor values to avoid overdriving the higher-gain device.

What is the thermal resistance R_θJA of MPSA56RLRAG on a standard FR-4 PCB?

The junction-to-ambient thermal resistance (R_θJA) of MPSA56RLRAG is 200 °C/W when mounted on a standard FR-4 PCB (1.6 in × 1.6 in × 0.06 in). This value directly determines the maximum allowable ambient temperature for safe operation at a given power dissipation. For example, at 300 mW dissipation, junction temperature rise is 60 °C above ambient.

Is MPSA56RLRAG suitable for audio-frequency amplification up to 20 kHz?

Yes - the MPSA56RLRAG has an f_T of 50 MHz and demonstrated gain flatness across the audio band in typical application circuits. Its h_FE stability and low V_CE(sat) support low-distortion Class-A operation. Real-world audio preamp designs using MPSA56RLRAG achieve THD < 0.5% at 1 kHz and maintain bandwidth well beyond 20 kHz.