onsemi MPSA14RLRA

Overview

MPSA14RLRA from onsemi is an NPN silicon Darlington transistor in TO-92 package, rated for 30 V_CE, 500 mA continuous collector current, and 625 mW power dissipation at 25°C ambient. It delivers DC current gain (h_FE) of 10,000–20,000 at I_C = 100 mA and V_CE = 5 V, with V_CE(sat) ≤ 1.5 V and V_BE(on) ≤ 2.0 V - optimized for high-gain switching in low-power relay drivers and sensor interface circuits.

For engineers reviewing the MPSA14RLRA datasheet, pinout, applications, or equivalent options, key selection criteria include verified Darlington gain bandwidth product (f_T = 125 MHz), thermal resistance (R_JA = 200°C/mW), noise performance at 10–15.7 kHz bandwidth, and Pb-free tape-and-reel packaging compliance per ON Semiconductor's Soldering and Mounting Techniques Reference Manual.

Technical Context

The MPSA14RLRA implements a monolithic NPN-NPN Darlington pair with integrated base-emitter resistor network absent - requiring external base drive control. Its high h_FE enables microampere-level base current to switch 100 mA loads, while f_T = 125 MHz supports moderate-speed switching up to ~100 kHz without significant gain roll-off.

Thermal design relies on R_JC = 83.3°C/mW and R_JA = 200°C/mW, with safe operating area limited by second breakdown above 10 V_CE and 100 mA. Noise characteristics are specified across 10 Hz–15.7 kHz bandwidth, with total wideband noise voltage < 8 nV/√Hz at I_C = 1.0 mA and R_S ≈ 0.

Key Specifications

Pinout & Package

Package: TO-92 (Case 29-11, Style 1), molded plastic with 3 leads; lead finish Pb-free per marking "G" suffix variants; standard orientation with flat side facing viewer and leads downward - Pin 1 (Emitter), Pin 2 (Base), Pin 3 (Collector).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPSA14RLRA, MPSA14RLRAG offers identical performance with Pb-free finish, while ULN2003A trades discrete simplicity for integrated multi-channel functionality - making MPSA14RLRA optimal for single-load, low-footprint, or legacy-compatibility requirements.

Availability

MPSA14RLRA is available at Aetrix Electronics and suitable for relay drivers, sensor interfaces, LED matrix row control, and industrial logic-level translation requiring stable component supply and long-term manufacturability.

Supply support for MPSA14RLRA 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MPSA13/MPSA14 family was designed as a preferred-lineage general-purpose Darlington transistor series targeting cost-sensitive, high-reliability linear and switching applications in industrial controls and legacy equipment.

FAQ

What is the maximum continuous collector current rating for MPSA14RLRA?

The MPSA14RLRA is rated for 500 mA continuous collector current at T_A = 25°C. Derating applies above 25°C at 5.0 mW/°C for ambient-limited operation or 12 mW/°C for case-limited operation. This rating assumes proper PCB copper area and airflow; actual usable current depends on thermal management and V_CE during conduction. The MPSA14RLRA maintains safe operation within its SOA curve up to 100 mA at 30 V_CE in single-pulse conditions.

Does MPSA14RLRA include an internal base resistor?

No, the MPSA14RLRA does not integrate any base resistor. It is a bare Darlington pair requiring external base current limiting - typically a series resistor between the driving source and Pin 2 (Base). This allows flexible biasing for varying load currents and switching speeds. Unlike digital transistors (e.g., MMBT2222A with built-in R₁/R₂), the MPSA14RLRA gives full control over base drive, making it suitable for precision analog or high-efficiency switching where resistor values must be tuned per application.

What is the typical DC current gain (h_FE) of MPSA14RLRA at 100 mA collector current?

The MPSA14RLRA exhibits h_FE of 10,000–20,000 when tested at I_C = 100 mA and V_CE = 5.0 Vdc. This range reflects device-to-device variation across the production lot; design margins should assume minimum 10,000 for worst-case base drive calculation. The gain remains stable across −55°C to +125°C junction temperatures, with only minor reduction above 100°C. The MPSA14RLRA achieves this high gain through monolithic NPN-NPN Darlington construction without emitter ballasting resistors.

Can MPSA14RLRA be used in linear amplifier configurations?

Yes, the MPSA14RLRA can operate in linear mode with appropriate biasing, though it is primarily optimized for switching. Its f_T = 125 MHz and low noise voltage (<8 nV/√Hz) support audio-frequency and sensor-signal amplification up to ~100 kHz. However, due to Darlington architecture, V_BE(on) is ~2.0 V and thermal runaway risk increases without emitter degeneration resistors. For dedicated linear use, the MPSA14RLRA requires careful thermal design and local feedback - unlike purpose-built RF or audio transistors.

What packaging format is supplied for MPSA14RLRA?

MPSA14RLRA is supplied in tape-and-reel format: 2000 units per reel, compatible with standard 8 mm carrier tape and EIA-481 specifications. The TO-92 package (Case 29-11, Style 1) features straight leads with standard pinout (Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector). Reel markings include date code (YYWW), manufacturer logo, and part number; Pb-free compliance is not inherent to MPSA14RLRA - that requires the "G" suffix variant MPSA14RLRAG.