onsemi MPSA63RLRA

Overview

MPSA63RLRA from onsemi is a PNP silicon Darlington transistor in TO-92 package, rated for −30 V_CEO, −500 mA continuous collector current, and 625 mW power dissipation at T_A = 25°C. 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 - used in high-gain switching and linear amplification stages of industrial control interfaces and relay drivers.

For engineers reviewing the MPSA63RLRA datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE ≥10,000 at −100 mA, −30 V breakdown rating, TO-92 leaded packaging for through-hole assembly, and thermal resistance R_JA = 200°C/W for ambient-limited designs.

Technical Context

The MPSA63RLRA implements a monolithic PNP 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 its −30 V V_CEO supports operation across 24 V industrial rails with margin.

Thermal design relies on junction-to-ambient conduction via TO-92 leads; R_JC = 83.3°C/W confirms case-mounted heatsinking is ineffective without modification. The device operates across −55°C to +150°C junction range but exhibits reduced f_T = 125 MHz only under specified −100 mA/−5 V bias - not representative of switching speed at low currents.

Key Specifications

Pinout & Package

Package: TO-92 (Case 29-11, Style 1), epoxy-molded, through-hole compatible, with 2.54 mm lead pitch and 4.45–5.20 mm body height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPSA63RLRA, MPSA63RLRAG offers identical performance with environmental compliance, while BCV61B trades voltage margin and through-hole compatibility for board-area reduction - making MPSA63RLRA optimal for robust 24 V industrial switching where legacy assembly and reliability dominate.

Availability

MPSA63RLRA is available at Aetrix Electronics and suitable for industrial relay drivers, low-power linear amplifiers, power supply enable circuits, and legacy TTL-level interface adapters requiring stable component supply and long-term manufacturability.

Supply support for MPSA63RLRA 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The MPSA62/63/64 family was designed as standardized, high-gain PNP Darlington transistors for cost-sensitive industrial control, relay driving, and interface level-shifting - emphasizing ruggedness, wide temperature operation, and TO-92 compatibility.

FAQ

What is the maximum continuous collector current rating for MPSA63RLRA?

The MPSA63RLRA is rated for −500 mA continuous collector current at T_A = 25°C. Derating is required above 25°C at 5.0 mW/°C. This rating allows direct switching of typical 24 V relay coils drawing up to 400 mA, provided PCB copper area and ambient temperature remain within specification limits for the 625 mW power dissipation capability.

Does MPSA63RLRA have an integrated base resistor?

No, the MPSA63RLRA does not include an integrated base resistor. It is a bare Darlington pair requiring external base current limiting - unlike digital transistors such as the MMBT2222A. Designers must calculate and place a series resistor between the driving source and Pin 2 (Base) to ensure I_B remains within safe limits for the desired I_C and h_FE range.

What is the collector-emitter saturation voltage of MPSA63RLRA under typical switching conditions?

The MPSA63RLRA specifies V_CE(sat) ≤ −1.5 V at I_C = −100 mA and I_B = −0.1 mA (I_C/I_B = 1000). At lower currents (e.g., −10 mA), V_CE(sat) drops to ≤ −1.0 V. This voltage defines the residual drop across the device during full conduction and directly impacts power loss and load voltage accuracy in switching applications.

Can MPSA63RLRA be used in surface-mount assemblies?

No, the MPSA63RLRA is packaged exclusively in TO-92 (through-hole) format and is not suitable for standard SMT reflow or pick-and-place processes. For surface-mount alternatives, consider the SOT-23-packaged BCV61B or the SOT-89 MPSA63 variant - both require layout revision and may differ in thermal performance and voltage ratings.

What is the safe operating area (SOA) limitation for MPSA63RLRA at DC operation?

At DC, the MPSA63RLRA's SOA is bounded by thermal limits (1.5 W at T_C = 25°C) and second breakdown. Per Figure 5, it supports −100 mA at −30 V only for pulse durations ≤1 ms. For continuous operation, the product of |V_CE| × |I_C| must stay below 625 mW at 25°C ambient - e.g., −25 V × −25 mA = 625 mW - with strict derating above that temperature.