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

Diodes Incorporated FMMT620QTA

Name: FMMT620QTA
Brand: Diodes Incorporated
SKU: FMMT620QTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FMMT620QTA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: FMMT620QTA.pdf

Description:: TRANS NPN 80V 1.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:6,974

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Product details

Overview

FMMT620QTA from Diodes Incorporated is an AEC-Q101-qualified 80V NPN silicon low-saturation transistor in SOT23 package, delivering 1.5A continuous collector current, 90mΩ R_CE(SAT) at I_C = 1.5A/ I_B = 20mA, and 625mW power dissipation. It serves as a high-reliability switching element in automotive power management and motor drive circuits.

For engineers reviewing the FMMT620QTA datasheet, FMMT620QTA pinout, FMMT620QTA application, or FMMT620QTA equivalent, key selection criteria include V_CEO = 80V, h_FE ≥ 200 at I_C = 10mA, pulsed I_C capability up to 5A, thermal resistance R_θJA = 200°C/W (steady-state), and AEC-Q101 qualification for under-hood automotive use.

Technical Context

This NPN transistor operates in linear or saturated switching mode with specified V_BE(sat) = 0.86V (typ) at I_C = 1.5A/ I_B = 50mA and f_T = 100MHz (min) at I_C = 50mA. Its safe operating area supports DC and pulsed loads up to 100µs–1s with V_CE ≤ 80V and I_C ≤ 1.5A.

Designed for high-current gain retention, h_FE remains ≥ 30 (min) even at I_C = 5A, enabling robust base drive efficiency in compact power stages. The device's low R_CE(SAT) minimizes conduction loss in 12V/24V automotive DC-DC modules and CCFL inverter half-bridges.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum collector-emitter voltage before breakdown; defines upper rail limit in 24V automotive switch applications.
I_C (continuous)	1.5 A - Continuous collector current rating; supports sustained 1.2A load switching with 20% margin at +125°C ambient.
R_CE(SAT)	90 mΩ - Low saturation resistance at I_C = 1.5A/ I_B = 20mA; reduces power loss to ≤203mW in on-state operation.
h_FE	200–450 - DC current gain range at I_C = 10–1.5A; enables stable base bias design across production lots and temperature.
f_T	100 MHz - Minimum transition frequency at I_C = 50mA; supports fast switching in PWM-driven motor control up to ~5MHz effective edge rate.
P_D	625 mW - Steady-state power dissipation on FR4 PCB (25mm × 25mm, 1 oz Cu); sets thermal derating threshold above +75°C ambient.

Pinout & Package

Package: SOT23 - Surface-mount plastic package (2.9mm × 1.35mm × 1.0mm), UL 94V-0 rated, moisture sensitivity level 1, matte tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	E	Reference node for base-emitter junction; connects to ground or low-side return path in high-side switch configurations.
2 (Base)	B	Control input requiring 20–50mA drive to saturate at 1.5A; designed for direct MCU GPIO or dedicated driver IC interface.
3 (Collector)	C	High-current output node; electrically isolated from PCB pad via thermal relief; primary heat path to copper pour through collector lead.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive under-hood operation (−55°C to +150°C), including temperature cycling, HTRB, and ESD testing per stress test plan.
Low R_CE(SAT)	90mΩ ensures <200mW conduction loss at full 1.5A load, reducing thermal load in space-constrained DC-DC modules.
High h_FE at high current	h_FE ≥ 30 at I_C = 5A enables efficient base drive with minimal gate-driver overhead in pulse-driven motor phases.
Green construction	Halogen- and antimony-free molding compound (<900ppm Br+Cl, <1000ppm Sb); compliant with automotive ELV and RoHS 2 directives.

Applications

DC-DC Power Modules

Automotive Motor Drivers

Use Scenario: Step-down converter in 12V-to-5V/3.3V auxiliary supply for infotainment ECUs.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier switch replacing Schottky diode to reduce forward drop and improve efficiency.

Use Value: 90mΩ R_CE(SAT) cuts conduction loss by >40% vs. 0.45V Schottky, increasing conversion efficiency from 82% to ≥87% at 1A load.

Use Scenario: Half-bridge leg in brushed DC motor driver for HVAC blower or seat actuator.

IC Role / Device Role / Timing Role: High-current NPN switch controlling motor winding current during PWM on-time.

Use Value: 5A pulsed I_C rating and 110ns t_off support 20kHz PWM without shoot-through risk or excessive switching loss.

CCFL Backlight Inverters

Industrial Power Management

Use Scenario: Resonant oscillator switch in LCD panel backlight inverter for commercial displays.

IC Role / Device Role / Timing Role: Fast-switching transistor driving resonant tank at 50–100kHz with controlled dV/dt.

Use Value: f_T ≥ 100MHz and C_obo = 11.5pF enable clean zero-voltage switching transitions and minimize EMI generation.

Use Scenario: Load switch in programmable power sequencer for FPGA or DSP core voltage rails.

IC Role / Device Role / Timing Role: Controlled turn-on/turn-off element managing inrush current and sequencing timing.

Use Value: V_CEO = 80V and h_FE stability over −55°C to +125°C ensure reliable rail enable across industrial temperature range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZXTN25050DFHTA	V_CEO = 50V (lower), R_CE(SAT) = 45mΩ (lower), SOT23-3 package, no AEC-Q101 qualification	Suitable for non-automotive 5V/12V logic-level switching only; not rated for 24V automotive systems	Select when lower saturation voltage is critical and AEC-Q101 is not required.
DMT3006LPSQ-13	V_CEO = 60V, R_CE(SAT) = 110mΩ, SOT23 package, AEC-Q101 qualified, h_FE min = 100 at I_C = 1A	Lower voltage rating limits use to 12V systems; higher R_CE(SAT) increases conduction loss by ~22% at 1.5A	Choose for cost-sensitive AEC-Q101 designs where 60V margin suffices and gain stability at 1A is acceptable.

Compared with ZXTN25050DFHTA and DMT3006LPSQ-13, FMMT620QTA uniquely balances 80V rating, 90mΩ R_CE(SAT), and AEC-Q101 compliance-making it the only option validated for 24V automotive switching with sub-200mW on-state loss at 1.5A.

Availability

FMMT620QTA is available at Aetrix Electronics and suitable for automotive motor control, DC-DC power modules, and CCFL backlight inverters requiring stable component supply and AEC-Q101 traceability.

Supply support for FMMT620QTA 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 components for automotive, industrial, and computing markets.

FMMT620QTA belongs to Diodes' FMMT series of automotive-qualified bipolar transistors, engineered specifically for high-current, low-saturation switching in harsh-environment power conversion and motor drive applications.

FAQ

What is the maximum continuous collector current for FMMT620QTA at +125°C ambient?

At +125°C ambient temperature, the maximum continuous collector current is derated to 1.05A based on the 625mW power dissipation limit and R_θJA = 200°C/W. This accounts for junction temperature rise of 125°C above ambient, maintaining T_J ≤ 150°C. Derating follows the linear curve shown in Figure 3 of DS33113 Rev. 3-2.

Is FMMT620QTA pin-compatible with standard SOT23 NPN transistors like BC847?

No-FMMT620QTA uses standard SOT23 pinout (E-B-C), but its electrical characteristics differ significantly: BC847 has V_CEO = 45V and I_C = 100mA, while FMMT620QTA delivers 80V/1.5A. Direct substitution risks overvoltage failure or thermal runaway; layout and drive circuit must be re-validated.

Does FMMT620QTA require external base current limiting in 3.3V MCU-driven applications?

Yes-driving the base directly from a 3.3V GPIO requires a series resistor to limit I_B to ≤50mA. For I_C = 1.5A and h_FE = 200 (min), minimum I_B = 7.5mA; a 390Ω resistor ensures safe 8.5mA drive at 3.3V, preventing base-emitter overcurrent and ensuring saturation.

How does the AEC-Q101 qualification impact FMMT620QTA's reliability in non-automotive applications?

AEC-Q101 qualification subjects FMMT620QTA to accelerated stress tests (e.g., 1000h HTOL, 1000 cycles TC, 1000h UHAST), resulting in demonstrated FIT rate <100 and mean time to failure >10⁷ hours. This translates to enhanced long-term stability and reduced infant mortality in industrial and medical power supplies-even outside automotive use.

FMMT620QTA 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):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 200mV @ 20mA, 1.5A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 200mA, 2V

Power - Max:: 625 mW

Frequency - Transition:: 160MHz

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

FMMT620QTA FAQ

1.How can I place an order for FMMT620QTA through Aetrix?

Please submit a Request for Quotation (RFQ) for FMMT620QTA 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 FMMT620QTA reliable?

The price and inventory of FMMT620QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT620QTA is usually 5 days.

3.What payment methods are accepted for FMMT620QTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT620QTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FMMT620QTA?

FMMT620QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FMMT620QTA 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 FMMT620QTA?

For technical support, including FMMT620QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT620QTA requirements.

6.How does Aetrix verify that FMMT620QTA is sourced from the original manufacturer or authorized distributors?

All FMMT620QTA 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 FMMT620QTA meets industry standards.

7.What is the process for return or replacement of FMMT620QTA?

All FMMT620QTA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT620QTA, 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 FMMT620QTA part is unused and in its original packaging.

Return procedure for FMMT620QTA:

1.Submit a request within 90 days.

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

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