onsemi MPSA05_D74Z

Overview

MPSA05_D74Z from ON Semiconductor is an NPN general-purpose amplifier transistor rated for 60 V V_CEO, 500 mA I_C, and 625 mW P_D in TO-92 package, used in low-to-medium power linear amplification and switching circuits such as audio preamplifiers, signal buffering, and discrete logic-level translation.

For engineers reviewing the MPSA05_D74Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain (h_FE ≥ 100 at 10–100 mA), V_CE(sat) ≤ 0.25 V, f_T = 100 MHz, and thermal resistance R_θJA = 200 °C/W - all critical for stable biasing and bandwidth-limited analog stages.

Technical Context

The MPSA05_D74Z operates as a silicon NPN bipolar junction transistor with fixed-emitter configuration, optimized for linear amplification up to 100 MHz and switching duty cycles ≤ 2.0% under pulse test conditions. Its process-sourced design (Fairchild Process 10) ensures consistent h_FE across 10–100 mA collector currents and low V_BE(on) of 1.2 V at I_C = 100 mA.

It supports continuous operation from −55 °C to +150 °C junction temperature, with absolute maximum ratings strictly defined: V_CBO = V_CEO = 60 V, V_EBO = 4.0 V, and I_C = 500 mA. Leakage is tightly controlled - ICEO and ICBO both ≤ 0.1 μA at rated voltages.

Key Specifications

Pinout & Package

Package: TO-92, 3-lead molded plastic case with straight or bent leads; standard through-hole mounting footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.

Compared with MMBTA05 and 2N3904, MPSA05_D74Z provides the highest continuous collector current (500 mA) and power dissipation (625 mW) in TO-92 form factor, making it optimal for medium-power linear and switching roles where thermal margin and drive capability are prioritized over ultra-high frequency or miniaturization.

Availability

MPSA05_D74Z is available at Aetrix Electronics and suitable for audio preamplification, discrete logic-level translation, and relay driver circuits requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for MPSA05_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 energy-efficient power management, analog, sensors, and logic devices for automotive, industrial, cloud computing, and consumer applications.

The MPSA05_D74Z belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild Semiconductor for cost-sensitive, high-reliability linear amplification and switching in commercial-grade equipment.

FAQ

What is the maximum collector current rating for MPSA05_D74Z?

The MPSA05_D74Z has an absolute maximum continuous collector current (I_C) rating of 500 mA at T_A = 25 °C. Derating applies above 25 °C at 5.0 mW/°C. This rating supports robust operation in relay drivers and medium-power amplifiers where transient peaks exceed 300 mA. Always verify thermal margin using R_θJA = 200 °C/W in your PCB layout when operating near this limit. The MPSA05_D74Z must not be operated beyond its specified I_C rating even for short durations unless pulse-tested per datasheet conditions.

Does MPSA05_D74Z have a documented h_FE range at 100 mA collector current?

Yes, the MPSA05_D74Z guarantees h_FE ≥ 100 when tested at I_C = 100 mA and V_CE = 1.0 V, per the official datasheet. This minimum gain is maintained across the full operating temperature range and ensures predictable bias point stability in emitter-follower and common-emitter amplifier designs. The MPSA05_D74Z does not specify an upper h_FE limit, so designs should accommodate variation using emitter degeneration or feedback. No typical or average h_FE value is published - only the guaranteed minimum.

Can MPSA05_D74Z be used in switching applications with 12 V supply rails?

Yes, the MPSA05_D74Z supports switching applications with 12 V supply rails, as its V_CEO and V_CBO ratings are both 60 V - well above 12 V with ample safety margin. In saturated switching mode, it achieves V_CE(sat) ≤ 0.25 V at I_C = 100 mA and I_B = 10 mA, minimizing power loss. The MPSA05_D74Z is commonly deployed in 12 V relay drivers and LED matrix row drivers. Ensure base drive meets minimum I_B requirements and verify thermal rise under sustained duty cycles.

What is the thermal resistance junction-to-ambient (R_θJA) for MPSA05_D74Z?

The MPSA05_D74Z has a specified R_θJA of 200 °C/W when mounted on a standard FR-4 PCB (1.6" × 0.06"). This value assumes no copper pour or heatsinking; adding thermal relief or copper area reduces effective R_θJA. It directly determines allowable ambient temperature at full power: at 625 mW dissipation, junction temperature rises 125 °C above ambient. The MPSA05_D74Z must remain below +150 °C T_J, so max ambient is +25 °C at full power without enhancement. Derating begins immediately above 25 °C.

Is MPSA05_D74Z pin-compatible with other TO-92 NPN transistors like 2N2222?

No, MPSA05_D74Z is not pin-compatible with 2N2222. While both use TO-92 packages, the pinout differs: MPSA05_D74Z uses E-B-C (Emitter-Base-Collector) sequence in straight-lead TO-92, whereas standard 2N2222 uses E-B-C in *bent-lead* TO-92 but with different mechanical orientation and gage plane reference. Swapping them without verifying physical pin mapping risks incorrect biasing or circuit failure. The MPSA05_D74Z pinout is explicitly defined as Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - always confirm against the official ON Semiconductor drawing before layout or replacement.