Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated FMMTL619TA

Name: FMMTL619TA
Brand: Diodes Incorporated
SKU: FMMTL619TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: FMMTL619TA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: FMMTL619TA.pdf

Description:: TRANS NPN 50V 1.25A SOT-23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,251

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

FMMTL619TA from Diodes Incorporated is a 50V NPN low-saturation transistor in SOT23 package, designed for high-efficiency switching in power control circuits. It delivers 1.25A continuous collector current, 330mV V_CE(sat) at 1.25A/125mA drive, and 160mΩ equivalent on-resistance, enabling compact MOSFET gate driving and DC-DC converter output stages.

For engineers reviewing the FMMTL619TA datasheet, FMMTL619TA pinout, FMMTL619TA application, or FMMTL619TA equivalent, key selection criteria include saturation voltage under high-current switching, thermal resistance (R_θJA = 250°C/W), AEC-Q101 qualification, and complementary PNP pairing with FMMTL720 for H-bridge motor control.

Technical Context

This NPN bipolar junction transistor operates with a minimum BV_CEO of 50V and supports pulsed peak currents up to 2A. Its h_FE ranges from 30 to 450 across 10mA–2A collector current, enabling stable gain in both linear regulation and saturated-switching modes.

Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and features halogen/antimony-free "Green" packaging with UL 94V-0 flammability rating. Thermal performance is characterized for 15mm × 15mm 1oz copper PCB mounting, with R_θJL = 197°C/W to collector lead.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (continuous)	1.25 A - Sustained current-handling capability without thermal runaway on standard PCB layout
V_CE(sat)	<330 mV @ 1.25A/125mA - Enables <0.4W conduction loss in high-duty-cycle switching
R_CE(sat)	160 mΩ - Low equivalent on-resistance improves efficiency vs. standard general-purpose transistors
f_T	180 MHz - Supports fast switching in DC-DC converters up to ~1–2 MHz operating frequency
ESD HBM	4000 V - Robust handling during board assembly and system integration
T_J range	−55°C to +150°C - Validated operation across automotive under-hood and industrial ambient conditions

Pinout & Package

SOT23 plastic surface-mount package with matte tin-plated leads; 0.008 g mass; JEDEC-standard footprint per AP02002; moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Low-impedance return path for collector current; connected to ground or low-side reference in switch configurations
2 (Base)	Control input	Receives current-limited drive signal to bias transistor into saturation; requires ≥125mA for full 1.25A conduction
3 (Collector)	Current source terminal	Connected to load or power rail; carries switched current with minimal voltage drop due to low R_CE(sat)

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive power electronics including engine control modules and body electronics
Low V_CE(sat) at high I_C	Reduces conduction losses by >40% versus standard 1A NPN transistors at same current density
Complementary PNP pair	FMMTL720 enables matched dual-transistor H-bridge or push-pull topologies without gain mismatch
"Green" RoHS-compliant construction	Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) meets global environmental compliance mandates

Applications

MOSFET Gate Driving

DC-DC Converter Output Stage

Use Scenario: Driving high-capacitance gates of N-channel power MOSFETs in synchronous buck regulators.

IC Role / Device Role / Timing Role: Low-saturation NPN switch providing rapid turn-on current surge while minimizing driver-stage conduction loss.

Use Value: 330mV V_CE(sat) limits gate-drive loss to <0.4W at 1.25A, improving overall converter efficiency and reducing thermal load on driver IC.

Use Scenario: High-current switching element in non-isolated DC-DC step-down converters for industrial sensors.

IC Role / Device Role / Timing Role: Main power switch replacing higher-V_CE(sat) transistors to reduce heat generation in compact 12V-to-5V designs.

Use Value: 160mΩ R_CE(sat) enables 92%+ efficiency at 1A output with minimal heatsinking on standard FR4 PCB.

LED Constant-Current Driver

H-Bridge Motor Control

Use Scenario: Linear current-regulating switch in high-brightness LED backlight drivers for displays.

IC Role / Device Role / Timing Role: Precision-controlled current sink with tight V_CE(sat) tolerance to maintain consistent LED brightness across temperature.

Use Value: Stable h_FE (200–400 at 500mA) and low thermal resistance allow ±3% current regulation without active feedback compensation.

Use Scenario: Low-side switch in bidirectional brushed DC motor controllers for automotive HVAC actuators.

IC Role / Device Role / Timing Role: Paired with FMMTL720 PNP for complementary half-bridge operation; handles 1.25A stall current with fast turn-off (379ns).

Use Value: Matched saturation characteristics and AEC-Q101 qualification ensure reliable direction reversal and PWM commutation in harsh environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-saturation NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZXTN25040DFHTA	Higher V_CEO (60V), lower V_CE(sat) (220mV @ 1A), but only 1A I_C rating and no AEC-Q101 qualification	Better for 24V industrial systems needing tighter saturation; unsuitable for automotive under-hood use	Select when higher voltage margin and lower loss outweigh qualification requirements
DMT3005LPS-7	Same SOT23-3 package, 50V V_CEO, but MOSFET-based (30V logic-level N-channel); R_DS(on) = 45mΩ @ 4.5V	Enables gate-drive with zero base current, but requires ≥4.5V logic-level drive and lacks bipolar linearity for analog regulation	Select for ultra-low-loss switching where gate drive voltage and PCB space permit MOSFET implementation

Compared with ZXTN25040DFHTA and DMT3005LPS-7, FMMTL619TA uniquely balances AEC-Q101 compliance, 1.25A current capability, and proven bipolar linearity for combined switching and linear regulation-making it optimal for cost-sensitive, thermally constrained automotive and industrial power stages.

Availability

FMMTL619TA is available at Aetrix Electronics and suitable for MOSFET gate driving, DC-DC converter output stages, and LED constant-current drivers requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for FMMTL619TA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and computing markets.

The FMMTL619TA belongs to Diodes' AEC-Q101-qualified low-saturation transistor product line, engineered specifically for efficient, compact, and robust switching in automotive body electronics and industrial power conversion.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum base current is 200mA per datasheet Absolute Maximum Ratings. For reliable 1.25A collector conduction, 125mA base drive is specified - exceeding this risks thermal overstress in SOT23 due to limited power dissipation (500mW). Derating is required above +25°C ambient.

Does FMMTL619TA support pulsed operation beyond its continuous ratings?

Yes - it supports 2A peak pulse current (I_CM) with ≤2% duty cycle and ≤300µs pulse width. This enables short-duration surge handling in motor startup or inrush limiting, provided thermal accumulation is managed via PCB copper area and pulse timing.

How does its h_FE variation affect circuit design?

h_FE ranges from 30 (at 2A) to 450 (at 10mA), requiring design margin in base drive. For 1.25A switching, 125mA base current ensures saturation even at minimum h_FE; linear regulator designs must account for gain roll-off at high current to avoid thermal runaway.

Is the SOT23 footprint compatible with automated optical inspection (AOI)?

Yes - the SOT23 package has standardized dimensions (C = 2.40mm, E = 1.35mm, pitch = 0.95mm) and matte tin-plated leads that provide high-contrast reflectivity for AOI systems. The L69 marking code is laser-etched for reliable machine-readability post-reflow.

FMMTL619TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1.25 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 330mV @ 125mA, 1.25A

Current - Collector Cutoff (Max):: 10nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 500mA, 5V

Power - Max:: 500 mW

Frequency - Transition:: 180MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

FMMTL619TA FAQ

1.How can I place an order for FMMTL619TA through Aetrix?

Please submit a Request for Quotation (RFQ) for FMMTL619TA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for FMMTL619TA reliable?

The price and inventory of FMMTL619TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMTL619TA is usually 5 days.

3.What payment methods are accepted for FMMTL619TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMTL619TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FMMTL619TA?

FMMTL619TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FMMTL619TA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for FMMTL619TA?

For technical support, including FMMTL619TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMTL619TA requirements.

6.How does Aetrix verify that FMMTL619TA is sourced from the original manufacturer or authorized distributors?

All FMMTL619TA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FMMTL619TA meets industry standards.

7.What is the process for return or replacement of FMMTL619TA?

All FMMTL619TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMTL619TA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The FMMTL619TA part is unused and in its original packaging.

Return procedure for FMMTL619TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…