Diodes Incorporated FMMTA64TA

Overview

FMMTA64TA from ON Semiconductor is a PNP silicon planar Darlington transistor in SOT-23 package, rated for V_CEO = −30 V, I_C = −500 mA, and h_FE = 10,000–20,000 at I_C = −10 mA, used in low-power switching and signal amplification circuits such as LED drivers and sensor interface stages.

For engineers reviewing the FMMTA64TA datasheet, FMMTA64TA pinout, FMMTA64TA application, or FMMTA64TA equivalent, key selection criteria include guaranteed high DC current gain (≥10k), low V_CE(sat) (≤−1.5 V at −100 mA), SOT-23 footprint compatibility, and −55°C to +150°C operating range for industrial control modules.

Technical Context

This Darlington pair integrates two PNP transistors monolithically to deliver high current gain with minimal base drive-enabling direct interfacing with microcontroller GPIOs. It operates with V_BE(sat) ≤ −2.0 V at I_C = −100 mA and supports pulsed I_CM up to −800 mA.

The device features complementary pairing with FMMTA63 and FMMTA14, shares identical absolute maximum ratings (V_CEO, V_CB, T_j), and exhibits f_T = 125 MHz under −50 mA/−5 V conditions-suitable for medium-speed switching above audio frequencies.

Key Specifications

Pinout & Package

SOT-23 surface-mount plastic package with gull-wing leads; standardized 3-pin outline per JEDEC TO-236AB. Pin assignment verified per ON Semiconductor FMMTA64 datasheet and marking diagram (C-B-E sequence).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSVMMTA64, FMMTA64TA offers identical performance at lower qualification cost; versus BC807-40, it delivers 15× higher gain but trades 0.8 V higher V_CE(sat), making it optimal for ultra-low-drive digital interfaces.

Availability

FMMTA64TA is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED driver modules, and microcontroller peripheral buffering requiring stable component supply across multi-year production cycles.

Supply support for FMMTA64TA 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.

FMMTA64TA belongs to the FMMT series of small-signal Darlington transistors designed specifically for space-constrained, high-gain switching in portable and industrial control systems.

FAQ

What is the maximum safe continuous collector current for FMMTA64TA?

The maximum continuous collector current is −500 mA at ambient temperature of 25°C. Derating is required above 25°C per the thermal resistance curve in the datasheet; at 100°C ambient, usable I_C drops to approximately −300 mA with no heatsink.

Can FMMTA64TA replace a standard PNP transistor like BC807 in existing designs?

No-it is a Darlington pair with significantly higher h_FE and V_BE(sat) ≈ −2.0 V. Substituting it for a single-PNP device will cause excessive base current draw and potential logic-level incompatibility unless the drive circuit is reconfigured for higher V_BE and reduced base resistance.

Does FMMTA64TA have integrated base-emitter resistors?

No. FMMTA64TA is a bare Darlington transistor without internal biasing resistors. External base resistors must be sized to deliver the required −0.1 mA base current for full saturation at −100 mA collector load, typically 33 kΩ from a 3.3 V logic high.

Is FMMTA64TA RoHS compliant and halogen-free?

Yes. Per ON Semiconductor's official product change notice (PCN 14-0139), FMMTA64TA is RoHS 2011/65/EU compliant and manufactured using halogen-free molding compounds, meeting IPC-4101D/126 requirements for green PCB assembly.