Diodes Incorporated FMMTL720TA

Overview

FMMTL720TA from ON Semiconductor is a PNP silicon planar medium-power transistor in SOT-23 package, designed for high-gain switching and linear amplification in low-voltage analog and power control circuits. It delivers V_CEO = −40 V, I_C = −1 A continuous, V_CE(sat) = −225 mV at I_C = −1 A / I_B = −100 mA, h_FE = 150–490 (depending on bias), and operates from −55°C to +150°C - used in DC-DC converter feedback stages and load-switching regulators.

For engineers reviewing the FMMTL720TA datasheet, FMMTL720TA pinout, FMMTL720TA application, or FMMTL720TA equivalent, key selection criteria include verified PNP saturation voltage under high-current drive, guaranteed h_FE range across collector current, thermal derating behavior in SOT-23, and complementary pairing with FMMTL619 for push-pull output stages.

Technical Context

This device is a medium-power PNP bipolar junction transistor optimized for stable DC gain and low-saturation operation in compact surface-mount applications. Its planar structure ensures consistent breakdown characteristics (V_(BR)CEO = −40 V min, V_(BR)EBO = −5 V min) and low leakage (I_CBO, I_EBO, I_CES ≤ −10 nA).

It supports pulsed switching with t_on/t_off = 61 ns each at I_C = −1 A, V_CC = −10 V, and exhibits f_T > 100 MHz under I_C = −50 mA, V_CE = −10 V - enabling use in moderate-frequency switching and audio preamplifier stages where gain linearity and thermal stability are critical.

Key Specifications

Pinout & Package

Package: SOT-23 (TO-236AB), 3-pin surface-mount plastic package with standard pin assignment: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT720, FMMTL720TA offers identical performance in a tighter SOT-23 form factor; versus ZTX720, it trades voltage headroom and thermal mass for space savings and compatibility with high-density layouts - making it optimal for compact, cost-sensitive 5–12 V systems.

Availability

FMMTL720TA is available at Aetrix Electronics and suitable for DC-DC converter feedback, industrial load switching, and audio preamplifier applications requiring stable component supply, tight gain matching, and extended temperature operation.

Supply support for FMMTL720TA 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 supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and consumer markets.

FMMTL720TA belongs to ON Semiconductor's legacy discrete transistor portfolio, engineered for reliability in medium-power linear and switching applications where gain stability, low saturation voltage, and thermal robustness are prioritized over ultra-high-speed operation.

FAQ

What is the maximum safe operating collector current at 85°C ambient?

At T_amb = 85°C, the maximum continuous collector current is approximately −650 mA, derived from the SOA curve showing DC derating to 65% of rated −1 A at 85°C. This assumes adequate PCB copper area (≥100 mm² 2-oz copper) and no forced airflow. Exceeding this risks thermal runaway due to h_FE increase with junction temperature.

Can FMMTL720TA replace BC807 in existing designs?

FMMTL720TA is not a direct replacement for BC807: BC807 has V_CEO = −45 V and h_FE = 160–400 at I_C = −100 mA, while FMMTL720TA specifies h_FE = 150–490 across wider current range but shares same SOT-23 pinout. Verify V_CE(sat) and SOA compliance under actual load conditions before substitution.

Is the FMMTL720TA RoHS compliant and lead-free?

Yes - FMMTL720TA is RoHS compliant and lead-free per ON Semiconductor's product change notice PCN-140117-001. The device uses matte tin (Sn) termination on all leads and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH.

Does the device require a heatsink in 1 A switching applications?

No external heatsink is required for 1 A pulsed switching (duty cycle ≤2%, pulse width ≤300 µs), as specified in the absolute maximum ratings. For continuous 1 A operation, thermal design must rely on PCB copper area (minimum 200 mm² 2-oz copper) - the SOT-23 package lacks thermal pad or exposed metal, limiting junction-to-board resistance to ~120°C/W.