onsemi MPSA13RLRPG

Overview

MPSA13RLRPG from ON Semiconductor is an NPN Darlington transistor optimized for high-current-switching applications requiring DC current gain (h_FE) of 5,000–10,000 at I_C = 10–100 mA, V_CE = 5 V, with V_CE(sat) ≤ 1.5 V and V_BE(on) ≈ 2.0 V - used in relay drivers, lamp drivers, and low-frequency power switching circuits.

For engineers reviewing the MPSA13RLRPG datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package, 30 V V_CES/V_CBO, 1.2 A continuous collector current rating, thermal resistance R_θJA = 200 °C/W, and suitability for linear/switching operation up to 125 MHz f_T.

Technical Context

The MPSA13RLRPG implements a monolithic NPN Darlington pair with integrated base-emitter resistor network absent in standard versions - enabling simplified biasing in low-speed switching designs. Its structure delivers high h_FE without external base resistors while maintaining V_BE(on) ≈ 2.0 V and V_CE(sat) ≤ 1.5 V under I_C = 100 mA / I_B = 0.1 mA conditions.

Designed for operation up to +150 °C junction temperature, it features R_θJC = 83.3 °C/W and R_θJA = 200 °C/W on FR-4 PCB (1.6" × 1.6" × 0.06"), supporting thermally constrained board-level implementations where discrete gain staging is impractical.

Key Specifications

Pinout & Package

Supplied in TO-92 plastic package (JEDEC TO-92 variant), lead-forming compliant with JEDEC JESD-30, with 1.27 mm lead pitch and 3.60 mm body width. Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT6427LT1G and ULN2003A, the MPSA13RLRPG offers superior single-device gain and TO-92 compatibility for legacy through-hole designs, while trading off integration density and built-in protection features found in array or surface-mount alternatives.

Availability

MPSA13RLRPG is available at Aetrix Electronics and suitable for relay driver circuits, lamp/LED array switching, DC motor control (low-speed), and linear voltage regulator pass elements requiring stable component supply and long-term industrial availability.

Supply support for MPSA13RLRPG 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, medical, and consumer markets.

The MPSA13RLRPG belongs to ON Semiconductor's general-purpose bipolar transistor product line, designed specifically for cost-sensitive, high-gain switching applications in industrial controls and legacy equipment replacement.

FAQ

What is the maximum continuous collector current rating for the MPSA13RLRPG?

The MPSA13RLRPG has a maximum continuous collector current (I_C) rating of 1.2 A at T_A = 25 °C. Derating applies above 25 °C at 5 mW/°C, and actual usable current depends on PCB layout, ambient temperature, and heatsinking. The MPSA13RLRPG must be operated within its safe operating area (SOA) defined by V_CE, I_C, and pulse conditions - especially under switching transients.

Does the MPSA13RLRPG require an external base resistor?

No, the MPSA13RLRPG does not require an external base resistor because it integrates a monolithic Darlington pair with internal base-emitter resistor network. This design allows direct connection of logic-level signals (e.g., 3.3 V or 5 V MCU GPIO) to the base terminal (Pin 2). The MPSA13RLRPG achieves h_FE ≥ 5,000 with this internal configuration, reducing system component count and simplifying drive circuitry.

What is the saturation voltage of the MPSA13RLRPG under typical operating conditions?

The MPSA13RLRPG exhibits a collector-emitter saturation voltage (V_CE(sat)) of ≤1.5 V when operated at I_C = 100 mA and I_B = 0.1 mA, with V_CE = 5.0 V. This low saturation voltage minimizes conduction losses - delivering <150 mW dissipation at 100 mA - making the MPSA13RLRPG suitable for thermally constrained switching applications where efficiency and thermal management are critical.

Can the MPSA13RLRPG be used in linear amplifier configurations?

Yes, the MPSA13RLRPG can operate in the active region for linear amplification, particularly in low-frequency (<100 kHz), low-power applications such as sensor signal conditioning or reference voltage buffering. Its f_T of 125 MHz and h_FE stability support modest gain-bandwidth performance. However, the MPSA13RLRPG is primarily optimized for switching use; for precision linear applications, dedicated small-signal transistors with tighter parameter distributions are recommended.

What is the thermal resistance from junction to ambient (R_θJA) for the MPSA13RLRPG?

The MPSA13RLRPG has a specified R_θJA of 200 °C/W when mounted on a standard FR-4 PCB measuring 1.6" × 1.6" × 0.06". This value assumes no additional copper pour or heatsinking. For higher-power operation, designers should verify junction temperature using T_J = T_A + (P_D × R_θJA) and ensure T_J remains ≤ +150 °C. The MPSA13RLRPG's R_θJC is 83.3 °C/W, indicating potential for improved thermal performance with case-level heatsinking.