onsemi TIP32CTU

Overview

TIP32CTU from onsemi is a PNP silicon power transistor in TO-220AB package, rated for 100 V_CEO, 3.0 A continuous collector current, and 40 W total power dissipation at T_C = 25°C. It delivers V_CE(sat) ≤ 1.2 V at I_C = 3.0 A and I_B = 375 mA, with f_T ≥ 3.0 MHz and h_FE ≥ 10 at I_C = 3.0 A - used in linear amplifiers, relay drivers, and DC motor control circuits.

For engineers reviewing the TIP32CTU datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CEO = 100 V rating, TO-220AB thermal resistance R_θJC = 3.125°C/W, confirmed complementary pairing with TIP31C, and safe operating area (SOA) compliance up to 10 ms pulses at 150°C junction temperature.

Technical Context

The TIP32CTU operates as a medium-power PNP bipolar junction transistor with fixed gain structure optimized for switching and Class-A/AB linear amplification. Its SOA is defined by secondary breakdown limits at high V_CE and thermal constraints governed by R_θJC = 3.125°C/W and R_θJA = 62.5°C/W.

It features low saturation voltage (V_CE(sat) ≤ 1.2 V), high sustaining voltage (V_CEO(sus) = 100 V), and robust unclamped inductive load capability (E = 32 mJ at I_C = 1.8 A, L = 20 mH). Base-emitter on voltage is specified at 1.8 V under I_C = 3.0 A conditions.

Key Specifications

Pinout & Package

Package: TO-220AB (Case 221A-09), 4-pin outline with dual collector terminals for enhanced current handling and thermal path optimization. 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 BD249C, the TIP32CTU provides superior thermal management via TO-220AB's dual-collector construction, maintains full 100 V/3 A capability in through-hole format, and supports higher-frequency linear operation due to its 3.0 MHz f_T - making it optimal for prototyping, repair, and industrial control where mechanical robustness and serviceability matter.

Availability

TIP32CTU is available at Aetrix Electronics and suitable for linear amplifier design, relay interface modules, DC motor control circuits, and adjustable linear power supplies requiring stable component supply across extended production lifecycles.

Supply support for TIP32CTU 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 management, analog, sensors, and logic devices for automotive, industrial, and cloud infrastructure markets.

The TIP32CTU belongs to onsemi's legacy silicon power transistor family designed for cost-sensitive, high-reliability general-purpose amplification and switching - emphasizing ruggedness, wide temperature operation, and compatibility with standard TO-220 heatsinks.

FAQ

What is the maximum continuous collector current rating for the TIP32CTU?

The TIP32CTU is rated for 3.0 Adc continuous collector current at T_C = 25°C. Derating is required above this temperature at 0.32 W/°C. This rating assumes proper heatsinking and adherence to the SOA curve in Figure 5 of the official datasheet. The TIP32CTU can sustain short-duration peak currents up to 5.0 Adc, but only for pulse widths within the safe operating area limits.

Is the TIP32CTU pin-compatible with other TIP32 variants like TIP32A or TIP32B?

Yes, the TIP32CTU shares identical TO-220AB pinout (Base–Collector–Emitter–Collector) and mechanical footprint with all TIP32-series devices including TIP32, TIP32A, TIP32B, and TIP32C. However, electrical differences exist: TIP32CTU has V_CEO = 100 V, whereas TIP32A is rated at 60 V and TIP32B at 80 V - substitution requires verification of voltage margin in the target circuit.

Does the TIP32CTU require a heatsink in typical switching applications?

Yes, the TIP32CTU requires a heatsink in any application dissipating more than ~2.0 W continuously. At I_C = 3.0 A and V_CE = 1.2 V (saturation), conduction loss alone reaches 3.6 W - exceeding the 2.0 W limit for operation at T_A = 25°C. A heatsink with thermal resistance ≤10°C/W is recommended to maintain T_J ≤125°C under full-load conditions.

Can the TIP32CTU be used as a direct replacement for the TIP32 in an existing design?

The TIP32CTU can replace the base TIP32 in most cases, but only if the circuit operates below 40 V - since the TIP32 is rated for V_CEO = 40 V while the TIP32CTU is rated for 100 V. Using TIP32CTU in a 40 V design introduces no risk, but offers no functional benefit unless future voltage margin or inductive energy handling (32 mJ vs. unspecified for TIP32) is needed.

What is the purpose of the fourth pin (Pin 4) on the TIP32CTU TO-220AB package?

Pin 4 is a second collector terminal, internally connected to Pin 2. Its purpose is to reduce effective lead resistance and improve thermal conduction from the die to the heatsink-mounted tab. In PCB layout, both collector pins must be routed to the same net - typically the system ground or negative rail - and the mounting tab must be electrically isolated unless intentionally tied to that net.