onsemi MPSW51ARLRA

Overview

MPSW51ARLRA from onsemi is a PNP silicon bipolar junction transistor rated for −40 V_CEO, −50 V_CBO, −5.0 V_EBO, −1000 mA continuous collector current, and 2.5 W total dissipation at T_C = 25°C, used in high-current linear switching and power amplification stages in industrial control and power supply circuits.

For engineers reviewing the MPSW51ARLRA datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package thermal resistance (R_JC = 50°C/W), guaranteed h_FE ≥ 60 at −100 mA, V_CE(sat) ≤ −0.7 V at −1000 mA/−100 mA drive, and f_T ≥ 50 MHz for medium-frequency switching.

Technical Context

This PNP transistor operates in active, saturation, and cutoff regions with verified DC current gain (h_FE) of 60 min at −100 mA and 50 min at −1000 mA, supporting stable biasing in Class-A amplifiers and saturated-switching configurations. Its −0.7 V_CE(sat) at I_C/I_B = 10 ensures low conduction loss in relay drivers and motor control interfaces.

Thermal design is enabled by R_JC = 50°C/W and R_JA = 125°C/W, allowing operation up to +150°C junction temperature. The device exhibits C_obo = 30 pF at −10 V_CB, limiting high-frequency gain roll-off while maintaining stability in feedback amplifier topologies.

Key Specifications

Pinout & Package

Package: TO-92 (Case 29-10, Style 1), 1 W rating, Pb-free, through-hole mounting with bent or straight leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-current transistor applications.

Compared with MPSW51RLRAG and BC639, MPSW51ARLRA provides higher voltage robustness for industrial 40 V bus systems and eliminates topology inversion needed for NPN alternatives-critical for high-side switching and negative-rail regulation.

Availability

MPSW51ARLRA is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor controllers, and linear voltage regulators requiring stable component supply with consistent TO-92 lead-forming and tape-and-reel packaging.

Supply support for MPSW51ARLRA 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

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

MPSW51ARLRA belongs to onsemi's general-purpose bipolar transistor product line, engineered for ruggedized industrial switching and amplification where reliability, thermal performance, and parametric consistency across temperature are critical.

FAQ

What is the maximum continuous collector current rating for MPSW51ARLRA?

The MPSW51ARLRA is rated for −1000 mAdc continuous collector current at T_C = 25°C. Derating applies above 25°C ambient or case temperature per the datasheet's thermal resistance values (R_JA = 125°C/W, R_JC = 50°C/W). This rating enables direct drive of 1 A loads such as relays and small DC motors without external current boosting.

Does MPSW51ARLRA have Pb-free and RoHS-compliant packaging?

Yes, MPSW51ARLRA uses a Pb-free TO-92 package compliant with RoHS Directive 2011/65/EU. The "G" suffix in the ordering code (e.g., MPSW51ARLRA → MPSW51ARLRAG) confirms Pb-free construction, and the device carries the microdot marking per onsemi's standard marking diagram for Case 29-10.

What is the guaranteed DC current gain (h_FE) of MPSW51ARLRA at −100 mA collector current?

The MPSW51ARLRA guarantees h_FE ≥ 60 at I_C = −100 mAdc, V_CE = −1.0 Vdc, and T_A = 25°C. This minimum gain ensures predictable base drive requirements in amplifier and switch bias networks, and remains valid across the full −55°C to +150°C junction temperature range per datasheet characterization.

Can MPSW51ARLRA be used in high-frequency amplifier circuits?

Yes, MPSW51ARLRA has a minimum current-gain–bandwidth product (f_T) of 50 MHz at I_C = −50 mAdc, V_CE = −10 Vdc, and f = 20 MHz. This supports stable small-signal amplification up to mid-audio frequencies and clean switching in PWM circuits up to 20 kHz without significant gain roll-off.

What is the thermal resistance from junction to case (R_JC) for MPSW51ARLRA?

The thermal resistance from junction to case (R_JC) for MPSW51ARLRA is 50°C/W. This value is measured under specified test conditions and enables accurate thermal modeling when the transistor is mounted to a heatsink or copper pour, allowing sustained 2.5 W dissipation at T_C = 25°C without exceeding the +150°C maximum junction temperature.