Diodes Incorporated FZT600TA

Overview

FZT600TA from Diodes Incorporated is a 140V NPN Darlington transistor in SOT223 package, delivering high DC current gain (>10,000 at IC = 1A), 2A continuous collector current, and 140V V_CEO breakdown voltage. It serves as a high-voltage, medium-power switching element in automotive lighting drivers and industrial relay interface circuits.

For engineers reviewing the FZT600TA datasheet, FZT600TA pinout, FZT600TA application, or FZT600TA equivalent, key selection criteria include guaranteed h_FE ≥ 5000 at 1A, V_CE(sat) ≤ 1.2V at IC = 1A/IB = 10mA, AEC-Q101 qualification, RoHS- and halogen-free compliance, and thermal resistance R_θJA = 41.7°C/W on 50mm × 50mm 2oz copper.

Technical Context

The FZT600TA integrates a monolithic NPN Darlington pair with emitter-follower configuration, enabling high current amplification while maintaining low base drive requirements. Its BV_CBO = 160V and BV_CEO = 140V support operation in high-voltage DC control rails up to 120V nominal systems.

Designed for stable performance across −55°C to +150°C junction temperature range, it features 2000V HBM ESD rating and thermal resistance R_θJL = 12.9°C/W to the collector lead-critical for power dissipation management in compact SOT223 layouts.

Key Specifications

Pinout & Package

SOT223 (Type DN) surface-mount package with molded green compound (UL 94V-0), matte tin-plated leads, and 0.112g mass. Collector is internally connected to the tab for enhanced thermal transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX603 and MJD127G, FZT600TA uniquely combines AEC-Q101 qualification, 140V rating, SOT223 thermal efficiency, and guaranteed high h_FE at 1A-making it optimal for compact, high-reliability 24–120V DC control nodes.

Availability

FZT600TA is available at Aetrix Electronics and suitable for automotive lighting drivers, industrial relay interfaces, high-voltage motor brake circuits, and power supply protection systems requiring stable component supply and long-term lifecycle assurance.

Supply support for FZT600TA 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, specializing in high-reliability components for automotive, industrial, and computing markets.

The FZT600TA belongs to Diodes' high-voltage Darlington transistor product line, engineered for robust switching in harsh-environment applications where voltage margin, thermal stability, and automotive qualification are mandatory.

FAQ

What is the maximum safe operating voltage for FZT600TA in continuous DC applications?

The FZT600TA is rated for 140V collector-emitter breakdown (BV_CEO) at 10mA, but derating per JEDEC guidelines recommends ≤112V for 100% reliability over temperature and lifetime. For 24V or 48V systems, it provides ample margin; for 90–120V rails, transient suppression must limit spikes to <140V.

Can FZT600TA be used without a heatsink in 2A switching applications?

Yes-if mounted on a 50mm × 50mm 2oz copper pad, its R_θJA = 41.7°C/W allows 3.0W dissipation at ≤75°C ambient. At 2A with V_CE(sat) = 1.2V, power is 2.4W, resulting in ~100°C junction rise-acceptable within its −55°C to +150°C rating. Smaller pads require thermal relief.

How does the AEC-Q101 qualification impact FZT600TA's use in non-automotive designs?

AEC-Q101 qualification subjects FZT600TA to accelerated stress tests (temperature cycling, HTRB, ESD, etc.) beyond standard industrial specs. This translates to higher intrinsic reliability, longer field life, and reduced infant mortality-even in industrial or medical applications where long-term stability is critical.

Is the SOT223 tab electrically isolated from the collector in FZT600TA?

No-the exposed metal tab in the SOT223 package is internally bonded to the collector terminal. It must be electrically connected to the collector net on the PCB and thermally coupled to a large copper area. Insulating the tab creates a short circuit and violates the device's thermal design intent.