Diodes Incorporated FZT690BTC

Overview

FZT690BTC from Diodes Incorporated is a 45V NPN medium-power high-gain transistor in SOT223 package, rated for 3.0A continuous collector current, with hFE > 400 at 1A and RCE(SAT) = 125 mΩ at 2A, used in DC-DC converters and siren drivers where low saturation voltage and high current gain are critical.

For engineers reviewing the FZT690BTC datasheet, FZT690BTC pinout, FZT690BTC application, or FZT690BTC equivalent, key selection criteria include VCEO = 45 V, IC = 3.0 A, hFE ≥ 400 @ 1A, RCE(SAT) = 125 mΩ @ 2A, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This NPN bipolar junction transistor operates as a medium-power switching device with high DC current gain and low saturation resistance. Its BVCEO and BVCBO both exceed 45 V, supporting robust operation in 24–48 V industrial and automotive power rails.

Thermal performance is defined by RθJA = 41.7 °C/W (on 50 mm × 50 mm 2 oz copper), enabling stable 3.0 W dissipation at TA = 25 °C. It features fT = 150 MHz and fast switching with tON = 33 ns and tOFF = 1300 ns under specified test conditions.

Key Specifications

Pinout & Package

SOT223 (Type DN) surface-mount package with three terminals: Collector (C), Emitter (E), and Base (B). The collector tab is electrically connected to the collector terminal and serves as primary heat path; molded plastic case meets UL 94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTN2012GTA and MJD122-TP, FZT690BTC offers superior hFE and tighter VCEO margin for 24–48 V rail applications, while maintaining identical SOT223 footprint and thermal interface compatibility.

Availability

FZT690BTC is available at Aetrix Electronics and suitable for DC-DC converters, siren drivers, and battery-powered circuits requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for FZT690BTC 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.

The FZT690BTC belongs to Diodes' high-reliability bipolar transistor product line, engineered for automotive and industrial power switching applications demanding AEC-Q101 compliance, low RCE(SAT), and high hFE stability.

FAQ

What is the maximum safe operating temperature for FZT690BTC?

The FZT690BTC has an operating junction temperature range of −55 °C to +150 °C. For reliable long-term operation, maximum junction temperature should be limited to 150 °C, with derating applied above 25 °C ambient based on RθJA = 41.7 °C/W (50 mm × 50 mm 2 oz copper). Thermal design must ensure adequate copper area on the collector pad.

Is FZT690BTC suitable for linear regulator applications?

FZT690BTC can operate in linear mode but is optimized for switching applications. Its RCE(SAT) = 125 mΩ at 2 A and VCE(SAT) ≤ 0.5 V at 1 A indicate low conduction loss in saturation, yet its SOA curve and thermal resistance require careful attention to power dissipation and heatsinking if used in continuous linear regulation above 1 W.

Does FZT690BTC have built-in ESD protection?

Yes - FZT690BTC is rated for 4000 V HBM (JEDEC Class 3A) and 400 V MM ESD immunity. This level of protection supports handling in standard manufacturing environments without additional external clamping, though system-level ESD design remains essential for end-equipment compliance.

How does the SOT223 package affect thermal performance?

The SOT223 package uses the collector tab as the primary thermal path. With RθJL = 12.9 °C/W, effective heat transfer depends on soldering the tab to ≥25 mm² of 2 oz copper. Performance degrades significantly with undersized pads: RθJA rises from 41.7 °C/W (50 mm × 50 mm) to 104 °C/W (minimum recommended layout).