onsemi TIP32B

Overview

TIP32B from onsemi is a PNP silicon power transistor in TO−220 package, rated for 60 V V_CEO, 3.0 A continuous collector current, and 40 W power dissipation at T_C = 25°C, designed for general-purpose linear amplification and hard-switching applications in industrial power supplies and motor control circuits.

For engineers reviewing the TIP32B datasheet, pinout, applications, or equivalent options, key selection criteria include its V_CEO = 60 V rating, h_FE ≥ 10 at I_C = 3.0 A, V_CE(sat) ≤ 1.2 V, thermal resistance R_JC = 3.125 °C/W, and Pb-free TO−220−3 package compatibility with standard heatsink mounting.

Technical Context

The TIP32B operates as a medium-power PNP bipolar junction transistor with fixed gain structure optimized for DC and low-frequency switching (≤3 MHz f_T). Its safe operating area (SOA) is defined by thermal limits at T_C = 25°C and secondary breakdown constraints up to 150°C junction temperature.

It features complementary pairing with TIP31B (NPN), shares identical TO−220−3 mechanical outline (Style 1), and uses base-emitter forward biasing (V_BE(on) ≤ 1.8 V at I_C = 3.0 A) with unclamped inductive load energy rating of 32 mJ under specified test conditions.

Key Specifications

Pinout & Package

Package: TO−220−3 (Case 221A, Style 1), 10.10 × 15.12 × 4.45 mm, 2.54 mm pin pitch, Pb-free, RoHS-compliant. Mounting tab is electrically connected to collector.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD32C and BDX54C, the TIP32B offers optimal balance of through-hole serviceability, standardized TO−220−3 pinout, and verified 60 V/3 A performance in legacy industrial designs - making it preferred where mechanical robustness and field-replaceability are prioritized over miniaturization or ultra-high voltage tolerance.

Availability

TIP32B is available at Aetrix Electronics and suitable for industrial motor control, DC power supply regulation, and audio amplifier output stages requiring stable component supply and long-term obsolescence mitigation.

Supply support for TIP32B 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 supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The TIP32B belongs to onsemi's legacy plastic power transistor family, engineered for cost-sensitive, high-reliability linear and switching applications where proven thermal behavior and mechanical ruggedness outweigh advanced integration.

FAQ

What is the maximum continuous collector current rating for the TIP32B?

The TIP32B is rated for 3.0 A continuous collector current (I_C) at case temperature T_C = 25°C. This rating decreases with rising case temperature at a derating rate of 0.32 W/°C for power dissipation, and corresponding current reduction must be calculated using the device's SOA curves and thermal resistance data to avoid exceeding 150°C junction temperature.

Is the TIP32B pin-compatible with the TIP32CG or TIP32AG variants?

Yes, the TIP32B shares identical TO−220−3 package (Style 1) and pinout (Base–Collector–Emitter–Collector) with TIP32AG and TIP32CG. However, their V_CEO ratings differ: TIP32B = 60 V, TIP32AG = 60 V, TIP32CG = 100 V. Electrical substitution requires verification that 60 V headroom suffices for the target circuit's peak voltage stress.

Does the TIP32B require a heatsink in typical switching applications?

Yes - the TIP32B dissipates significant power during conduction (e.g., 3.6 W at I_C = 3.0 A and V_CE(sat) = 1.2 V). With R_JC = 3.125 °C/W and R_CA typically >60 °C/W without heatsink, junction temperature would exceed 150°C rapidly. A minimum 10 cm² aluminum heatsink is recommended for sustained 3 A operation at ambient ≤50°C.

Can the TIP32B be used as a direct replacement for the TIP32 in legacy designs?

No - the TIP32 (non-suffix) was discontinued and not Pb-free. The TIP32B is RoHS-compliant with identical electrical specs and TO−220−3 package, but its marking includes "G" suffix indicating Pb-free construction. Soldering profiles must follow lead-free guidelines, and long-term reliability testing under thermal cycling should be repeated if substituting into existing qualification-tested assemblies.

What is the safe operating area (SOA) limitation for the TIP32B at 100 V collector-emitter voltage?

The TIP32B is not rated for 100 V operation - its absolute maximum V_CEO is 60 V. At V_CE = 100 V, the device exceeds its breakdown rating and risks immediate avalanche failure. For 100 V applications, use TIP32CG (V_CEO = 100 V) instead, which shares the same package and pinout but has higher voltage-rated internal structure.