Diodes Incorporated FMMTA64TC

Overview

FMMTA64TC from ON Semiconductor is a PNP silicon planar Darlington transistor in SOT-23 package, rated for -30 V V_CEO, -500 mA I_C, and 330 mW P_tot, with h_FE of 10,000–20,000 at -10 mA and -100 mA, used in low-power switching and signal amplification circuits such as LED drivers and sensor interface stages.

For engineers reviewing the FMMTA64TC datasheet, FMMTA64TC pinout, FMMTA64TC application, or FMMTA64TC equivalent, key selection criteria include verified Darlington gain consistency at low base drive, guaranteed V_CE(sat) ≤ -1.5 V under -100 mA load, thermal performance in SOT-23 at T_j = -55 to +150 °C, and complementary pairing with FMMTA14 for push-pull configurations.

Technical Context

This device implements a monolithic PNP Darlington pair with integrated emitter resistor, delivering high DC current gain (h_FE ≥ 10k) while maintaining tight V_CE(sat) control (-1.5 V max at -100 mA/-0.1 mA). Its f_T of 125 MHz enables stable operation up to audio-frequency switching.

The SOT-23 package supports surface-mount assembly with defined thermal resistance (R_θJA ≈ 370 °C/W), and absolute maximum ratings include -30 V VCBO/VC EO, -10 V VEBO, and -800 mA I_CM, ensuring robustness in transient-prone bias networks.

Key Specifications

Pinout & Package

SOT-23 plastic surface-mount package with standard 3-pin layout (lead pitch 0.95 mm, body size 2.9 × 1.3 × 1.0 mm), optimized for automated placement and reflow soldering in space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP Darlington switching applications.

Compared with MMBT6427 and ZTX951, FMMTA64TC delivers superior current gain and lower saturation voltage in an SMT-optimized footprint, making it optimal for space-constrained, low-base-drive, and thermally sensitive applications like portable sensor nodes and wearable LED indicators.

Availability

FMMTA64TC is available at Aetrix Electronics and suitable for LED driver stages, microcontroller interface circuits, low-power relay drivers, and temperature sensor bias networks requiring stable component supply and consistent parametric performance across production batches.

Supply support for FMMTA64TC 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 energy-efficient power management, analog, and discrete devices for automotive, industrial, and consumer markets.

FMMTA64TC belongs to the FMMT series of high-gain SOT-23 transistors designed specifically for low-voltage, low-base-drive switching and amplification in compact, thermally constrained PCB layouts.

FAQ

What is the maximum continuous collector current for FMMTA64TC?

The maximum continuous collector current (I_C) is -500 mA at T_amb = 25 °C. Derating is required above this temperature per the R_θJA value of ~370 °C/W. At 70 °C ambient, the usable I_C drops to approximately -350 mA to maintain T_j ≤ 150 °C.

Does FMMTA64TC have an integrated base resistor?

No, FMMTA64TC does not include an integrated base resistor. It is a bare Darlington transistor requiring external base current limiting. The device relies on externally set I_B to achieve specified V_CE(sat) and h_FE performance, as confirmed by test conditions in the official datasheet.

Can FMMTA64TC be used in linear amplification mode?

Yes, but with caution: its high h_FE and Darlington structure make it susceptible to thermal runaway in Class-A configurations. It is characterized and optimized for switching use; linear applications require strict thermal management, emitter degeneration, and bias stabilization per the FZTA64 typical characteristics graphs referenced in the datasheet.

Is FMMTA64TC RoHS compliant and halogen-free?

Yes, FMMTA64TC is RoHS compliant and halogen-free per ON Semiconductor's product change notice PCN-1911-01. The SOT-23 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), supporting unlimited floor life at ≤30 °C/85% RH.