Diodes Incorporated FMMTA56TC

Overview

FMMTA56TC from ON Semiconductor is a PNP silicon planar medium-power transistor in SOT-23 package, rated for V_CEO = −80 V, I_C = −500 mA, and P_tot = 330 mW at T_amb = 25°C; used in low-voltage DC-DC converter bias circuits and discrete load switching in industrial control modules.

For engineers reviewing the FMMTA56TC datasheet, FMMTA56TC pinout, FMMTA56TC application, or FMMTA56TC equivalent, key selection criteria include verified h_FE range (50–50 at I_C = −10 mA), V_CE(sat) ≤ −0.25 V at I_C = −100 mA/I_B = −10 mA, f_T = 100 MHz, and SOT-23 thermal derating behavior under continuous conduction.

Technical Context

This PNP bipolar junction transistor operates with emitter-grounded configuration and supports linear amplification or saturated switching in low-frequency (<10 MHz) analog and digital interface stages. Its fixed h_FE of 50 at I_C = −10 mA and V_CE = −1 V enables predictable base drive sizing in current-mirror and level-shift circuits.

V_CE(sat) of −0.25 V at I_C = −100 mA ensures <100 mW dissipation in saturation, while f_T = 100 MHz confirms usable bandwidth for pulse-width modulation (PWM) gate driving up to ~10 MHz with controlled rise/fall times.

Key Specifications

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; 3-terminal configuration optimized for automated placement and reflow soldering on 1.0 mm pitch PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBTA56-7-F, FMMTA56TC offers identical performance but discontinued status necessitates BOM update; PN2907A introduces mechanical and thermal trade-offs that reduce layout flexibility and thermal margin in compact designs.

Availability

FMMTA56TC is available at Aetrix Electronics and suitable for industrial relay drivers, low-voltage level shifters, and DC-DC converter bias circuits requiring stable component supply across multi-year production cycles.

Supply support for FMMTA56TC 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, and discrete components for automotive, industrial, and cloud infrastructure markets.

FMMTA56TC belongs to the MMBTA56 family of general-purpose PNP transistors designed for cost-sensitive, medium-power switching and amplification in industrial control and power supply subsystems.

FAQ

Is FMMTA56TC pin-compatible with MMBTA56-7-F?

Yes - both use identical SOT-23 pinout (Emitter-Base-Collector on pins 1-2-3) and share identical absolute maximum ratings, h_FE, V_CE(sat), and f_T. The MMBTA56-7-F is the direct replacement per ON Semiconductor's discontinuation notice and qualifies for drop-in substitution without layout or firmware changes.

What is the maximum allowable base current for reliable operation?

The datasheet specifies I_B = −10 mA at I_C = −100 mA for V_CE(sat) testing. For continuous operation, base current must be limited to ≤ −5 mA using a series resistor to prevent thermal runaway, given the device's 330 mW P_tot and SOT-23 thermal resistance.

Can FMMTA56TC be used in linear amplifier configurations?

Yes - its h_FE stability (50 at I_C = −10 mA) and V_CEO = −80 V support Class-A common-emitter amplifiers up to 100 kHz. However, f_T = 100 MHz and lack of guaranteed linearity specs make it better suited for switching than precision analog gain stages.

Does FMMTA56TC meet RoHS and REACH requirements?

No - FMMTA56TC is marked obsolete and was manufactured prior to full RoHS-6 compliance enforcement. Its replacement MMBTA56-7-F meets RoHS, REACH, and halogen-free standards, with full material declarations available in ON Semiconductor's official compliance portal.