onsemi MPSA14_D74Z

Overview

MPSA14_D74Z from ON Semiconductor is an NPN Darlington transistor in TO-92 radial ammo packaging (EOL code D74Z), designed for high-current-switching applications requiring DC current gain ≥10,000 at IC = 10 mA and VCE = 5 V, collector-emitter breakdown voltage of 30 V, and continuous collector current up to 1.2 A - commonly used in relay drivers, lamp drivers, and low-frequency power switching circuits.

For engineers reviewing the MPSA14_D74Z datasheet, pinout, applications, or equivalent options, key selection criteria include verified Darlington configuration, TO-92 mechanical compatibility with D74Z ammo orientation (flat side up, collector lead first), thermal resistance RθJA = 200 °C/W on FR-4, and saturation voltage VCE(sat) ≤ 1.5 V at IC = 100 mA/IB = 0.1 mA.

Technical Context

This device implements a monolithic NPN Darlington pair optimized for high DC current gain and low base drive requirements. It features a guaranteed minimum hFE of 10,000 at IC = 10 mA and 20,000 at IC = 100 mA, with VBE(on) = 2.0 V at IC = 100 mA, enabling direct interface with TTL/CMOS logic without external base resistors in many cases.

Thermally, it supports operation from –55 °C to +150 °C junction temperature, with total device dissipation PD = 625 mW at TA = 25 °C and derating of 5.0 mW/°C above that point. Its fT = 125 MHz at IC = 10 mA ensures usable bandwidth for low-speed switching and analog amplification up to several megahertz.

Key Specifications

Pinout & Package

Package: TO-92 radial ammo (EOL code D74Z), flat side up, collector lead first - matches standard TO-92 footprint with lead pitch 0.100" (2.54 mm) and body height 0.928" ±0.025".

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPSA14_D74Z, MPSA13 offers reduced gain headroom but identical form factor, while MMBTA14 trades thermal robustness and current capacity for miniaturization - neither is pin-compatible in layout, and both require revalidation of thermal performance and drive network.

Availability

MPSA14_D74Z is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and DC motor starters requiring stable component supply across industrial control, test equipment, and power management designs.

Supply support for MPSA14_D74Z 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 power management, analog, sensors, and discrete devices, with core expertise in energy-efficient and high-reliability silicon solutions.

The MPSA14_D74Z belongs to ON Semiconductor's legacy Fairchild discrete transistor portfolio, engineered for general-purpose high-gain switching in industrial, automotive, and consumer systems where robustness and ease of use are critical.

FAQ

What is the pin configuration of MPSA14_D74Z in TO-92 radial ammo packaging?

The MPSA14_D74Z uses standard TO-92 pinout: Emitter (E), Base (B), Collector (C), with flat side up and collector lead first per D74Z orientation specification. This matches JEDEC TO-92 mechanical outline and ensures compatibility with automated placement feeders calibrated for D74Z ammo reels.

Does MPSA14_D74Z have built-in base-emitter resistors?

No, MPSA14_D74Z is a bare Darlington transistor without integrated base resistors. External base current limiting is required - typically a 10 kΩ resistor from 3.3 V or 5 V logic output to the base terminal to ensure safe IB = 0.1–0.5 mA for IC ≤ 100 mA switching.

Can MPSA14_D74Z replace MPSA13 in existing designs?

MPSA14_D74Z can substitute for MPSA13 in most layouts due to identical TO-92 package and pinout, but its higher minimum hFE (10,000 vs. 5,000) may reduce base drive margin in marginal designs. Verify VCE(sat) and thermal rise remain within spec under worst-case load conditions.

What is the maximum continuous collector current for MPSA14_D74Z at 70°C ambient?

At TA = 70 °C, MPSA14_D74Z supports IC ≤ 925 mA continuously. This is derived from its 625 mW PD rating at 25 °C and 5.0 mW/°C derating: (625 mW − (70−25) × 5.0) = 400 mW max dissipation; with VCE(sat) ≈ 1.3 V, IC = 400 mW / 1.3 V ≈ 308 mA - but absolute IC limit remains 1.2 A regardless of dissipation, so thermal design governs practical current.

Is MPSA14_D74Z suitable for linear amplifier applications?

MPSA14_D74Z is characterized for switching use and lacks guaranteed linearity specs (e.g., distortion, THD). While its fT = 125 MHz and hFE stability support low-frequency analog gain, ON Semiconductor does not specify small-signal parameters like rπ or Early voltage - use only in Class-A or AB amplifiers after bench validation of gain flatness and thermal drift.