Diodes Incorporated FZT560TA

Overview

FZT560TA from Diodes Incorporated is a 500V PNP high-voltage transistor in SOT223 package, designed for off-line switching and high-voltage linear regulation. It delivers -150mA continuous collector current, -500V V_CEO, and -200mV V_CE(sat) at -20mA/-2mA, enabling robust operation in flyback snubber circuits and industrial power supply hold-up stages.

For engineers reviewing the FZT560TA datasheet, FZT560TA pinout, FZT560TA application, or FZT560TA equivalent, key selection criteria include verified -500V breakdown rating, thermal resistance of 62.5°C/W on 25mm × 25mm copper, SOA compliance up to 100ms pulses, and RoHS-compliant matte tin plating for lead-free reflow compatibility.

Technical Context

This PNP bipolar junction transistor operates with fixed-base drive in high-side switch configurations, where emitter is tied to high-voltage rail and collector sinks current to ground or lower potential. Its -500V BV_CEO and -100nA I_CES at -500V support reliable blocking in AC/DC primary-side protection and relay driver circuits.

The device exhibits h_FE = 80–300 at -50mA/-10V and f_T = 60MHz, confirming suitability for moderate-speed switching (≤100kHz) rather than RF or high-frequency PWM. Turn-on/off times of 110ns and 1.5µs are validated under -100V V_CC, -50mA I_C conditions per JEDEC test setup.

Key Specifications

Pinout & Package

Package: SOT223 (Type DN), molded green plastic, UL 94V-0 rated, with matte tin-plated leads solderable per MIL-STD-202 Method 208. Collector tab is electrically connected to Pin 1 and thermally coupled to PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX603 and MJD2955T4G, FZT560TA uniquely balances 500V blocking, SOT223 thermal efficiency, and industrial-grade reliability-making it the sole option for compact, high-voltage auxiliary power and snubber designs requiring both voltage headroom and surface-mount manufacturability.

Availability

FZT560TA is available at Aetrix Electronics and suitable for industrial power supply snubbers, AC/DC auxiliary bias windings, and high-side relay drivers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for FZT560TA 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 centers across Asia and Europe, serving industrial, computing, and consumer markets.

The FZT560TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for off-line power conversion, surge protection, and industrial control applications demanding ruggedness, precise breakdown control, and green packaging compliance.

FAQ

What is the maximum continuous power dissipation for FZT560TA on a standard PCB?

The FZT560TA dissipates up to 2W continuously when mounted on 25mm × 25mm 2oz copper on FR4, corresponding to its R_θJA = 62.5°C/W rating. Exceeding this requires either increased copper area (e.g., 50mm × 50mm for 3W) or forced-air cooling. Derating begins linearly above +25°C ambient, reaching zero dissipation at +150°C case temperature.

Can FZT560TA replace an NPN transistor in the same circuit?

No-FZT560TA is a PNP device with inverted polarity: emitter connects to high voltage, collector sinks current. Replacing an NPN requires complete circuit reconfiguration-including reversing bias networks, swapping drive logic, and verifying voltage stress on all nodes. It is not a drop-in substitute and must be integrated as a high-side switch or complementary element.

Is the FZT560TA suitable for automotive applications?

The standard FZT560TA is not AEC-Q101 qualified. Diodes offers the FZT560Q variant, which undergoes automotive-grade stress testing and is documented in a separate datasheet. For automotive designs, only FZT560Q should be used-FZT560TA lacks the required qualification, traceability, and extended temperature validation.

How does the SOT223 package affect thermal performance compared to TO-92 or TO-220?

The SOT223 package provides significantly better thermal performance than TO-92 (R_θJA ≈ 200°C/W) due to its exposed collector tab, while remaining surface-mount compatible. Though less efficient than TO-220 (R_θJA ≈ 1.5°C/W), SOT223 achieves R_θJA = 62.5°C/W on 25mm² copper-striking a balance between manufacturability, board space, and thermal capability for medium-power HV applications.