onsemi BDW93CTU

Overview

BDW93CTU from ON Semiconductor is a high-power NPN epitaxial silicon Darlington transistor in TO-220 package, rated for 100 V V_CEO, 12 A DC collector current, and 80 W power dissipation at T_C = 25°C. It delivers h_FE ≥ 100 at I_C = 10 A and features integrated parallel diode with V_F ≤ 1.8 V at I_F = 10 A, used in industrial hammer drivers and audio amplifier output stages.

For engineers reviewing the BDW93CTU datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO rating, safe operating area (SOA) at high pulse currents, thermal resistance (R_θJC = 1.5°C/W), and complementary pairing with BDW94CTU for push-pull configurations.

Technical Context

The BDW93CTU implements a monolithic Darlington pair with built-in base-emitter shunt resistor and parallel freewheeling diode, enabling direct drive of inductive loads without external flyback protection. Its SOA curve supports 100 V × 10 A operation for 100 µs pulses and maintains stable gain (h_FE = 100–20,000) across 0.1–10 A collector current range.

Designed for linear and switching operation, it uses epitaxial base construction to minimize saturation voltage (V_CE(sat) ≤ 3 V at I_C = 10 A, I_B = 100 mA) and withstands V_CBO = 100 V. Thermal derating begins at T_C = 25°C, with full power maintained up to 100°C case temperature per the published derating curve.

Key Specifications

Pinout & Package

BDW93CTU is housed in a standard TO-220 package with insulated tab, 3-pin configuration, and through-hole mounting. The case serves as the collector terminal and must be electrically isolated from heatsink unless system grounding permits common-collector connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BDW93CTU, BDW93C offers identical performance in tube packaging, while MJD127G trades voltage/current headroom and integrated protection for surface-mount compatibility-neither is pin-compatible, and layout changes are required for either alternative.

Availability

BDW93CTU is available at Aetrix Electronics and suitable for industrial hammer drivers, audio power amplifiers, and DC motor controllers requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for BDW93CTU 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, sensor, and logic devices for automotive, industrial, and cloud power applications.

The BDW93CTU belongs to ON Semiconductor's legacy high-power bipolar transistor product line, originally developed by Fairchild Semiconductor for ruggedized linear and switching power control in factory automation and audio systems.

FAQ

What is the maximum continuous collector current rating for BDW93CTU?

The BDW93CTU has a maximum continuous collector current (I_C) rating of 12 A at T_C = 25°C. This rating assumes adequate heatsinking to maintain case temperature within limits; derating applies above 25°C per the published thermal curve. At 100°C case temperature, usable I_C drops to approximately 6 A. BDW93CTU must not be operated beyond its Safe Operating Area boundaries defined in the datasheet.

Does BDW93CTU include an integrated freewheeling diode?

Yes, BDW93CTU integrates a parallel freewheeling diode between collector and emitter, with forward voltage V_F ≤ 1.8 V at I_F = 10 A. This diode provides inherent protection against inductive kickback in relay, solenoid, and motor drive applications. No external flyback diode is required when using BDW93CTU in such topologies, reducing component count and failure points.

What is the pin configuration of BDW93CTU in the TO-220 package?

BDW93CTU uses a standard TO-220 3-pin configuration: Pin 1 (left) is Base, Pin 2 (center) is Collector (connected to the metal tab), and Pin 3 (right) is Emitter. The tab is electrically live as the collector terminal and must be insulated from the heatsink unless system grounding architecture permits direct contact. Mounting orientation follows JEDEC TO-220 outline standards.

How does BDW93CTU differ from BDW93A and BDW93B variants?

BDW93CTU differs from BDW93A and BDW93B primarily in its voltage ratings: BDW93CTU has V_CEO = 100 V and V_CBO = 100 V, whereas BDW93A is rated for 60 V and BDW93B for 80 V. All share identical package (TO-220), current rating (12 A), power dissipation (80 W), and internal Darlington/diode structure. Selection depends strictly on required voltage margin in the target application.

Is BDW93CTU suitable for linear regulator applications?

Yes, BDW93CTU is suitable for linear regulator pass transistor applications due to its high power dissipation (80 W), low thermal resistance (R_θJC = 1.5°C/W), and stable h_FE across operating current. It supports output currents up to 10 A with appropriate heatsinking and biasing. However, designers must verify SOA compliance under worst-case dropout and load conditions, as BDW93CTU is not internally current-limited.