Diodes Incorporated FMMT560TA

Overview

FMMT560TA from Diodes Incorporated is a 500V PNP high-voltage transistor in SOT23 package, rated for -500V collector-emitter breakdown (BV_CEO), -150mA continuous collector current (I_C), and -500mA peak pulse current (I_CM). It serves as a high-voltage switching element in offline power supplies, flyback controllers, and industrial snubber circuits where robust voltage blocking and fast turn-off are required.

For engineers reviewing the FMMT560TA datasheet, FMMT560TA pinout, FMMT560TA application, or FMMT560TA equivalent, key selection criteria include verified BV_CEO ≥ −500 V, h_FE = 100–300 at I_C = −1 mA to −100 mA, V_CE(SAT) ≤ −500 mV at I_C = −50 mA, thermal resistance R_θJA = 250 °C/W, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This PNP bipolar junction transistor operates in common-emitter configuration with fully specified safe operating area up to −500 V and −500 mA pulses. Its design emphasizes high-voltage blocking integrity, low leakage (I_CBO ≤ −100 nA at V_CB = −500 V), and stable h_FE across I_C = −1 mA to −100 mA.

It features a transition frequency f_T of 60 MHz at V_CE = −20 V and I_C = −10 mA, with turn-on time t_ON = 110 ns and turn-off time t_OFF = 1.5 µs under pulsed −100 V/−50 mA conditions - enabling use in medium-frequency switch-mode topologies.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic case, 0.008 g weight, UL 94V-0 rated, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX653 and BCX56-16, FMMT560TA uniquely delivers −500 V blocking in SOT23 with AEC-Q101 validation - making it the only option for compact, automotive-qualified, high-voltage PNP switching in space-constrained industrial and adapter designs.

Availability

FMMT560TA is available at Aetrix Electronics and suitable for offline AC-DC adapters, flyback controller auxiliary switches, and industrial relay drivers requiring stable component supply and long-term lifecycle support.

Supply support for FMMT560TA 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.

FMMT560TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for reliable switching in mains-connected power conversion, industrial control, and automotive auxiliary systems where voltage robustness and thermal stability are critical.

FAQ

What is the maximum safe operating voltage for FMMT560TA in continuous DC conditions?

The absolute maximum collector-emitter voltage (V_CEO) is −500 V at T_A = +25°C. For continuous DC operation, derating is required above +25°C per the R_θJA = 250 °C/W curve; at +100°C ambient, maximum safe V_CE drops to approximately −420 V to maintain junction temperature below +150°C.

Does FMMT560TA require a heatsink in standard SOT23 mounting?

No external heatsink is required. With R_θJA = 250 °C/W on a 15 mm × 15 mm, 1 oz copper pad, the device dissipates up to 500 mW at +25°C ambient. At full −150 mA I_C and −500 mV V_CE(SAT), power dissipation is 75 mW - well within safe limits without added thermal mass.

Can FMMT560TA replace an NPN transistor in the same circuit?

No - it is a PNP device with opposite polarity and current flow direction. Direct replacement would invert logic and biasing. Circuit redesign is required, including swapping supply references, reversing base drive polarity, and verifying safe operating area compatibility with the new topology.

Is the FMMT560TA marking code "560" sufficient for full part identification?

Yes - "560" is the standardized top-marking for FMMT560TA per Diodes' datasheet. Combined with SOT23 package dimensions and matte tin-plated leads, this marking uniquely identifies the device. No secondary marking or date code is needed for functional verification in production test.