Diodes Incorporated FZT690BTA

Overview

FZT690BTA 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 FZT690BTA datasheet, FZT690BTA pinout, FZT690BTA application, or FZT690BTA equivalent, key selection criteria include VCEO = 45 V, IC = 3.0 A, hFE ≥ 400 @ 1 A, VCE(SAT) ≤ 0.50 V @ 1 A, 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 (hFE up to 500 at 0.1 A), enabling efficient Darlington pair replacement and low-base-drive designs. Its low RCE(SAT) of 125 mΩ at 2 A reduces conduction losses in battery-powered and high-current pulse applications.

The device features robust thermal performance: RθJA = 41.7 °C/W on 50 mm × 50 mm 2 oz copper PCB, and qualified to AEC-Q101 for automotive use. ESD ratings meet HBM 4 kV and MM 400 V, supporting reliable operation in industrial and portable environments.

Key Specifications

Pinout & Package

SOT223 (Type DN) surface-mount package with three terminals: Collector (C), Emitter (E), and Base (B). The collector tab is internally connected to pin 1 and serves as primary thermal 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 transistor applications.

Compared with ZXTN2012ZTA and MJD127G, the FZT690BTA delivers superior current gain and lower saturation resistance in compact SOT223 form, making it optimal for space-constrained, high-efficiency switching where base drive simplicity and thermal density matter most.

Availability

FZT690BTA is available at Aetrix Electronics and suitable for DC-DC converters, siren drivers, and battery-powered circuits requiring stable component supply, AEC-Q101 compliance, and long-term production continuity.

Supply support for FZT690BTA 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 FZT690BTA belongs to Diodes' high-reliability NPN transistor product line, engineered specifically for automotive and industrial switching applications demanding robustness, low saturation voltage, and AEC-Q101 qualification.

FAQ

What is the maximum continuous collector current for FZT690BTA?

The FZT690BTA supports 3.0 A continuous collector current (IC) at TA = +25°C with proper PCB thermal management-specifically on a 50 mm × 50 mm 2 oz copper area. Derating applies above +25°C ambient; at +100°C, max IC drops to approximately 1.8 A per the published thermal curve.

Is FZT690BTA suitable for automotive applications?

Yes-FZT690BTA is AEC-Q101 qualified and PPAP capable, meeting stress test requirements for temperature cycling, humidity, and mechanical shock. It is explicitly marked "AEC-Q101" in ordering information and intended for under-hood and body-control modules where reliability and thermal stability are critical.

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 to the lead, effective heat transfer requires soldering the tab to ≥25 mm² of 2 oz copper. On 50 mm × 50 mm 2 oz FR-4, RθJA is 41.7 °C/W-enabling 3.0 W dissipation without forced air cooling.

What is the typical VCE(SAT) at 2 A collector current?

At IC = 2 A and IB = 10 mA, the typical VCE(SAT) is 0.10 V, with a maximum of 0.50 V specified across temperature and process variation. This low saturation voltage directly reduces conduction loss to ≤100 mW at 2 A, supporting high-efficiency switching in portable and automotive power stages.