onsemi MPSA65_D75Z

Overview

MPSA65_D75Z from ON Semiconductor (formerly Fairchild) is a PNP Darlington transistor optimized for high-current-switching applications requiring minimum 50,000 DC current gain at 10 mA and 20,000 at 100 mA, with 30 V V_CEO, 1.2 A continuous collector current, and TO-92 package - used in relay drivers, lamp dimmers, and low-frequency power switching circuits.

For engineers reviewing the MPSA65_D75Z datasheet, pinout, applications, or equivalent options, key selection criteria include verified Darlington configuration, guaranteed h_FE ≥ 20,000 at I_C = 100 mA, V_CE(sat) ≤ 1.5 V under same conditions, thermal resistance R_θJA = 200 °C/W on FR-4, and TO-92 mechanical compatibility.

Technical Context

This device implements a monolithic PNP Darlington pair with integrated base-emitter resistor network absent - external base drive required. It operates as a high-gain, medium-voltage, low-frequency switch with f_T = 100 MHz measured at I_C = 10 mA, V_CE = 5 V, but not rated for RF amplification due to saturation delay and thermal limitations.

Designed for DC and pulsed switching up to 100 kHz, it features V_BE(on) = 2.0 V at I_C = 100 mA, enabling direct TTL/CMOS interface with appropriate base current limiting; junction temperature range spans −55°C to +150°C, supporting industrial and automotive under-hood environments when derated.

Key Specifications

Pinout & Package

Package: TO-92 - through-hole, 3-lead plastic case with standardized footprint and lead spacing per JEDEC TO-92 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBTA65 and PZTA65, the MPSA65_D75Z provides optimal balance of through-hole manufacturability, thermal performance on standard PCBs, and proven reliability in legacy industrial controls - making it preferred for field-serviceable or mixed-technology assemblies.

Availability

MPSA65_D75Z is available at Aetrix Electronics and suitable for relay drivers, lamp dimmers, and solenoid controllers requiring stable component supply across long-lifecycle industrial programs.

Supply support for MPSA65_D75Z 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 IoT applications.

The MPSA65_D75Z belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered specifically for robust, high-gain switching in cost-sensitive, high-reliability industrial control systems.

FAQ

What is the maximum continuous collector current rating for MPSA65_D75Z?

The MPSA65_D75Z has a maximum continuous collector current (I_C) rating of 1.2 A at T_A = 25°C. Derating applies above 25°C per the specified 5.0 mW/°C slope. This rating assumes proper PCB thermal design - e.g., 1.6″ × 1.6″ FR-4 copper area - and is validated for steady-state operation, not pulsed loads.

Is MPSA65_D75Z a single transistor or a Darlington pair?

MPSA65_D75Z is a monolithic PNP Darlington transistor - two cascaded PNP transistors integrated into one die to achieve ultra-high DC current gain. Its h_FE of ≥50,000 at 10 mA and ≥20,000 at 100 mA confirms this architecture, distinguishing it from standard PNP transistors like the MPSA64.

What is the pin configuration of MPSA65_D75Z in the TO-92 package?

MPSA65_D75Z uses the standard TO-92 pinout: viewed with flat side facing outward and leads pointing down, the left-to-right pin order is Emitter (E), Base (B), Collector (C). This matches JEDEC TO-92 outline and is identical to the original Fairchild MPSA65 specification.

Can MPSA65_D75Z replace MPSA64 in existing designs?

No - MPSA65_D75Z is a PNP Darlington with V_CEO = 30 V and h_FE ≥ 20,000, whereas MPSA64 is an NPN transistor with V_CEO = 30 V but h_FE ≈ 100–300. They differ in polarity, gain, saturation behavior, and circuit topology; direct substitution would invert logic and likely cause failure.

What is the typical V_CE(sat) of MPSA65_D75Z under standard test conditions?

The typical V_CE(sat) of MPSA65_D75Z is 1.5 V when tested at I_C = 100 mA and I_B = 0.1 mA. This value is guaranteed maximum per datasheet and reflects the combined saturation drop across both Darlington stages - critical for calculating conduction losses in power switching applications using MPSA65_D75Z.