onsemi MPSA13G

Overview

MPSA13G from ON Semiconductor is an NPN Darlington transistor optimized for high-current-switching applications requiring extreme DC current gain (h_FE ≥ 5,000 at I_C = 10 mA) and low-saturation operation, with V_CE(sat) ≤ 1.5 V at I_C = 100 mA / I_B = 0.1 mA, rated for continuous collector current up to 1.2 A and junction temperatures from –55 °C to +150 °C - used in relay drivers, lamp dimmers, and industrial control interface stages.

For engineers reviewing the MPSA13G datasheet, pinout, applications, or equivalent options, key selection criteria include verified h_FE range (5,000–10,000), TO-92 package thermal resistance (R_θJA = 200 °C/W), V_CE(sat) performance under defined drive conditions, and safe operating area limits at 30 V C-E breakdown.

Technical Context

The MPSA13G implements a monolithic NPN Darlington pair structure with integrated base-emitter resistor network absent in standard versions, enabling high input impedance and simplified biasing. Its design targets linear and saturated switching modes where high β reduces required base drive current while maintaining stable gain across I_C = 10 mA to 100 mA.

It operates within a 30 V maximum collector-emitter voltage rating and delivers f_T = 125 MHz under small-signal conditions (I_C = 10 mA, V_CE = 10 V), supporting moderate-speed switching in discrete amplifier and driver circuits without requiring external compensation.

Key Specifications

Pinout & Package

Package: TO-92 - Standard through-hole plastic package with 1.27 mm lead pitch, 3.60 mm body width, and 14.47 mm overall length; suitable for manual assembly and wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPSA13G, MPSA14G provides higher guaranteed gain but increased V_CE(sat), while BC517 offers lower saturation voltage at the expense of wider h_FE tolerance and reduced thermal efficiency - making MPSA13G the balanced choice for general-purpose high-gain switching where reliability and thermal predictability are prioritized.

Availability

MPSA13G is available at Aetrix Electronics and suitable for relay drivers, lamp dimmers, industrial sensor interfaces, and DC motor direction control requiring stable component supply across automotive, industrial automation, and building control programs.

Supply support for MPSA13G 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.

The MPSA13G belongs to ON Semiconductor's legacy discrete bipolar transistor portfolio, designed specifically for high-gain, medium-power linear and switching applications in cost-sensitive, space-constrained systems.

FAQ

What is the maximum continuous collector current rating for the MPSA13G?

The MPSA13G is rated for a maximum continuous collector current (I_C) of 1.2 A at T_A = 25 °C. This rating assumes proper PCB thermal management per the datasheet's FR-4 mounting condition. At elevated ambient temperatures, derating applies - for example, at 75 °C ambient, usable I_C drops to approximately 0.8 A based on its 5 mW/°C thermal derating slope and 625 mW total dissipation limit. Always verify actual junction temperature in final layout using R_θJA = 200 °C/W.

Does the MPSA13G have an integrated base-emitter resistor?

Yes, the MPSA13G includes an internal base-emitter resistor network that simplifies biasing and improves input impedance over standard NPN transistors. This feature eliminates the need for external base resistors in many low-speed switching applications, such as driving relays or LEDs from microcontroller GPIO pins. The resistor configuration is fixed and not user-adjustable, and it contributes to the device's specified h_FE range and V_BE(on) = 2.0 V at I_C = 100 mA.

Can the MPSA13G replace the MPSA13 in existing designs?

Yes, the MPSA13G is a direct replacement for the legacy MPSA13, maintaining identical electrical specifications, TO-92 package dimensions, pinout (Emitter-Base-Collector), and thermal characteristics. The "G" suffix denotes ON Semiconductor's green packaging standard (halogen-free, RoHS-compliant), with no functional or performance differences. No PCB or schematic changes are required when upgrading from MPSA13 to MPSA13G in production or repair scenarios.

What is the typical V_CE(sat) of the MPSA13G under standard test conditions?

The typical V_CE(sat) of the MPSA13G is ≤1.5 V when tested at I_C = 100 mA and I_B = 0.1 mA, with V_CE = 5.0 V. This value reflects the combined saturation voltage of both Darlington transistors in series and is critical for calculating conduction losses in switching applications. At lower currents (e.g., I_C = 10 mA), V_CE(sat) drops further - typically below 1.0 V - enabling efficient operation in low-power control stages.

Is the MPSA13G suitable for use in automotive under-hood applications?

Yes, the MPSA13G supports junction temperatures from –55 °C to +150 °C and is qualified for industrial-grade operation, making it suitable for non-safety-critical automotive under-hood applications such as HVAC actuators, lighting controls, and body electronics. It is not AEC-Q101 qualified, so it should not be used in safety-critical systems (e.g., airbag controllers or ABS modules) without additional validation. Thermal design must account for R_θJA = 200 °C/W and ambient extremes encountered in engine compartments.