Diodes Incorporated FZT692BTA

Overview

FZT692BTA from Diodes Incorporated is a 70V NPN medium-power high-gain transistor in SOT223 package, rated for 2A continuous collector current, with DC current gain hFE ≥ 400 at IC = 0.5A and VCE = 2V, and BVCEO > 70V. It serves as a robust switching and amplification device in relay drivers, solenoid interfaces, and DC-DC converter power stages.

For engineers reviewing the FZT692BTA datasheet, FZT692BTA pinout, FZT692BTA application, or FZT692BTA equivalent, key selection criteria include its 70V breakdown rating, 2A continuous current capability, thermal resistance of 41.7°C/W (on 50mm × 50mm 2oz copper), complementary PNP pairing with FZT792A, and AEC-Q101 readiness for automotive-grade designs.

Technical Context

This NPN bipolar junction transistor operates in linear and saturated switching modes, supporting high-current drive with low VCE(sat) - 500 mV max at IC = 2A and IB = 200mA. Its fT of 150 MHz enables moderate-frequency switching, while input/output capacitances (Cibo = 200 pF, Cobo = 12 pF) define bandwidth limitations in amplifier configurations.

The device features ESD robustness (HBM = 4 kV, MM = 400 V), operates across –55°C to +150°C, and is qualified per J-STD-020 Level 1 moisture sensitivity. Its SOT223 package provides enhanced thermal performance over SOT-23, with RθJL = 12.9°C/W enabling efficient heat transfer via the collector lead to PCB copper.

Key Specifications

Pinout & Package

Package: SOT223 (Type DN), surface-mount, 4-pin configuration with emitter-connected tab for thermal and electrical grounding. Molded green compound, matte tin-plated leads, UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTN2012ZTA and MJD122G, FZT692BTA uniquely balances 70V rating, 2A current, high gain, and SOT223 thermal performance - making it optimal for 48V industrial switching where both voltage margin and efficiency matter.

Availability

FZT692BTA is available at Aetrix Electronics and suitable for relay drivers, solenoid interfaces, and DC-DC converter switches requiring stable component supply, long-term lifecycle assurance, and automotive-qualified sourcing.

Supply support for FZT692BTA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

FZT692BTA belongs to Diodes' high-reliability power transistor product line, engineered specifically for industrial control, automotive body electronics, and power conversion applications demanding ruggedness, thermal stability, and AEC-Q101 alignment.

FAQ

What is the maximum safe operating temperature for FZT692BTA?

The FZT692BTA has an operating junction temperature range of –55°C to +150°C. Under continuous 2A operation with RθJA = 41.7°C/W on a 50mm × 50mm 2oz copper PCB, junction temperature rises ~83°C above ambient - limiting max ambient to +67°C for 150°C Tj. Derating is required above 25°C ambient per the datasheet's thermal curves.

Is FZT692BTA pin-compatible with other SOT223 NPN transistors?

FZT692BTA uses standard SOT223 (Type DN) pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector, Pin 4 = Emitter/Tab. While mechanically compatible with all SOT223 footprints, electrical compatibility depends on voltage, current, and gain requirements - e.g., MJD122G shares pinout but differs in hFE and VCE(sat), requiring circuit validation.

Does FZT692BTA require a heatsink in typical applications?

No external heatsink is required for FZT692BTA in most applications when mounted on ≥25mm × 25mm 2oz copper. At 2A continuous current and 25°C ambient, junction temperature stays below 125°C using the recommended pad layout. For sustained >1.5A operation in enclosed or high-ambient environments, additional copper area or airflow is advised per the thermal derating curves.

Can FZT692BTA replace a Darlington pair in existing designs?

Yes - FZT692BTA's hFE ≥ 400 at 0.5A enables single-transistor replacement of many Darlington configurations (e.g., MPSA13), reducing base drive complexity and eliminating second-transistor saturation delay. However, verify VCE(sat) and switching speed requirements, as Darlington pairs offer higher gain but slower turn-off (toff ≈ 2–5 µs vs. FZT692BTA's 1440 ns).