onsemi TN5415A

Overview

TN5415A from Fairchild Semiconductor is a PNP high-voltage amplifier transistor designed for driver-stage applications requiring up to 100 mA collector current and 200 V collector-emitter breakdown voltage, commonly used in flyback converter gate drive, relay drivers, and high-side switching circuits.

For engineers reviewing the TN5415A datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO = 200 V, I_C = 100 mA, h_FE = 30–150 at 50 mA, R_θJA = 50 °C/W, and TO-226 package compatibility with legacy high-voltage BJT layouts.

Technical Context

The TN5415A is a silicon PNP bipolar junction transistor fabricated on Fairchild's Process 76, optimized for high-voltage linear and switching operation with guaranteed V_(BR)CEO ≥ 200 V at I_C = 50 mA and V_CE(sat) ≤ 2.5 V at I_C = 50 mA / I_B = 5 mA.

Its thermal design supports continuous operation up to +150 °C junction temperature, with R_θJC = 125 °C/W and R_θJA = 50 °C/W enabling moderate-power dissipation (P_D = 1.0 W at 25 °C, derated 8 mW/°C above), suitable for non-isolated high-side driver stages where base-driven control and voltage margin are critical.

Key Specifications

Pinout & Package

Package: TO-226 (also known as TO-92), molded plastic case with 3 leads. Standard lead configuration: Emitter (E), Base (B), Collector (C) - viewed from flat side with leads down, left-to-right is E-B-C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage amplifier applications.

Compared with MPSA92 and PN2907A, the TN5415A delivers balanced high-voltage capability (200 V), moderate current (100 mA), and superior thermal resistance (R_θJA = 50 °C/W), making it optimal for compact, thermally sensitive high-side drivers where 300 V margin is unnecessary and 60 V is insufficient.

Availability

TN5415A is available at Aetrix Electronics and suitable for relay drivers, flyback gate drives, high-voltage logic interfaces, and linear regulator pass elements requiring stable component supply across industrial control, power conversion, and test instrumentation programs.

Supply support for TN5415A 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

Fairchild Semiconductor was a U.S.-based analog and power semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy high-voltage BJT portfolio remains widely deployed in industrial and power applications.

The TN5415A belongs to Fairchild's high-voltage PNP amplifier family, engineered specifically for robust, cost-effective driver solutions in non-isolated high-side switching and interface circuits.

FAQ

What is the maximum continuous collector current rating for the TN5415A?

The TN5415A has a maximum continuous collector current (I_C) rating of 100 mA at T_A = 25 °C. This rating assumes proper thermal management; derating applies above 25 °C per the specified 8 mW/°C slope. The device supports pulsed currents up to 100 mA within safe operating area limits defined at V_CE = 100 V and t = 100 ms.

Is the TN5415A pin-compatible with the MPSA92?

Yes, the TN5415A uses the same TO-226 (TO-92) package and identical E-B-C lead assignment as the MPSA92, enabling direct physical replacement. However, the TN5415A offers lower R_θJA (50 vs. 200 °C/W) and tighter h_FE range (30–150 vs. 25–100), making it preferable in thermally constrained or gain-critical designs where 200 V V_CEO suffices.

What is the typical V_CE(sat) of the TN5415A under standard test conditions?

The TN5415A exhibits a maximum V_CE(sat) of 2.5 V when tested at I_C = 50 mA and I_B = 5.0 mA. Typical values observed in production fall near 1.8–2.2 V, supporting efficient saturated switching in driver applications where minimizing conduction loss is essential for thermal and efficiency targets.

Can the TN5415A be used in linear regulator applications?

Yes, the TN5415A is suitable as a series pass element in adjustable high-voltage linear regulators. Its 200 V V_CEO, 100 mA I_C, and 1.0 W power dissipation (with appropriate heatsinking) allow stable regulation up to ~150 V output with moderate load current, provided junction temperature remains below +150 °C per its rated operating range.

What is the safe operating area (SOA) limit for the TN5415A at 100 V collector-emitter voltage?

At V_CE = 100 V, the TN5415A's safe operating area supports a maximum collector current of 100 mA for pulse durations up to 100 ms. This SOA boundary is defined under single-pulse conditions and must be validated against actual circuit waveforms, especially in inductive switching applications where secondary breakdown risk exists.