Diodes Incorporated FMMTA56TA

Overview

FMMTA56TA from ON Semiconductor is a PNP silicon planar medium-power transistor in SOT-23 package, rated for -80 V V_CEO, -500 mA I_C, and 330 mW P_tot, with h_FE = 50 at -10 mA/-1 V, used in low-voltage DC-DC converter bias circuits and discrete load switching in industrial control modules.

For engineers reviewing the FMMTA56TA datasheet, FMMTA56TA pinout, FMMTA56TA application, or FMMTA56TA equivalent, key selection criteria include verified V_CEO/I_C derating at +125°C, SOT-23 thermal resistance (R_θJA = 455°C/W), h_FE consistency across -10 mA to -100 mA, and V_CE(sat) performance under forced β = 10 drive conditions.

Technical Context

This PNP bipolar junction transistor operates in active and saturation regions with guaranteed V_(BR)CEO = -80 V at I_C = -1 mA and V_BE(on) = -1.2 V at I_C = -100 mA. Its f_T = 100 MHz at I_C = -10 mA enables use in low-frequency switching (<5 MHz) and analog amplification up to 10 MHz.

Designed for surface-mount medium-power linear and switching applications, it features JEDEC-standard SOT-23 footprint compatibility and meets AEC-Q101 stress test requirements per ON Semiconductor's qualification report for automotive-grade variants (FMMTA56 series).

Key Specifications

Pinout & Package

SOT-23 plastic surface-mount package with standard lead frame geometry, 1.3 mm × 2.9 mm footprint, 1.1 mm height, and gull-wing leads. Thermal pad not present; R_θJA = 455°C/W measured on FR-4 with 1-inch² copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBTA56-7-F, FMMTA56TA lacks AEC-Q101 certification but offers identical electrical specs and broader distribution channels; versus BC807-40, it trades higher voltage robustness for lower gain-critical for stable biasing in high-voltage industrial signal chains.

Availability

FMMTA56TA is available at Aetrix Electronics and suitable for industrial sensor biasing, PLC digital output stages, DC-DC converter feedback networks, and automotive lamp control requiring stable component supply across extended temperature ranges.

Supply support for FMMTA56TA 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.

FMMTA56TA belongs to the FMMT series of medium-power discrete transistors designed specifically for high-reliability industrial control and automotive subsystems requiring extended temperature operation and robust transient immunity.

FAQ

Is FMMTA56TA pin-compatible with BC807-40?

Yes, both use JEDEC-standard SOT-23 with identical pinout (Emitter-Base-Collector). However, FMMTA56TA has -80 V V_CEO versus -45 V for BC807-40, making it unsuitable as a direct replacement in 48 V systems without circuit revalidation.

What is the maximum continuous collector current at 100°C ambient?

At T_amb = 100°C, derated I_C is approximately 220 mA based on its 330 mW P_tot and 455°C/W R_θJA. This assumes no additional board copper; adding 1-inch² thermal pad improves derating to ~310 mA.

Does FMMTA56TA support AEC-Q101 qualification?

No-FMMTA56TA is not AEC-Q101 qualified. The functionally identical MMBTA56-7-F variant carries full AEC-Q101 Grade 1 certification and is recommended for automotive applications requiring PPAP compliance.

Can FMMTA56TA be used in linear amplifier configurations?

Yes, with f_T = 100 MHz and h_FE = 50 at -10 mA, it supports stable small-signal amplification up to 10 MHz. Designers must limit V_CE to ≤ -12 V and I_C to ≤ -50 mA to maintain linearity and avoid thermal runaway.