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

Diodes Incorporated FMMT620TA

Name: FMMT620TA
Brand: Diodes Incorporated
SKU: FMMT620TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FMMT620TA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: FMMT620TA.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:20,049

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Product details

Overview

FMMT620TA from Diodes Incorporated is an 80V NPN silicon low-saturation transistor in SOT23 package, rated for 1.5A continuous collector current, 625mW power dissipation, and 90mΩ R_CE(SAT) at I_C = 1A/ I_B = 20mA. It serves as a high-reliability switching element in DC-DC modules and motor drive stages where low conduction loss and AEC-Q101 qualification are required.

For engineers reviewing the FMMT620TA datasheet, FMMT620TA pinout, FMMT620TA application, or FMMT620TA equivalent, key selection criteria include V_CEO = 80V, h_FE ≥ 200 at I_C = 10mA, R_CE(SAT) ≤ 145mV at I_C = 1.5A, thermal resistance R_θJA = 200°C/W (FR4), and SOT23 mechanical compatibility with automated placement.

Technical Context

This NPN transistor operates in linear or saturated switching mode with BV_CEO = 80V and BV_CBO = 100V, enabling use in medium-voltage power control circuits. Its h_FE remains ≥ 170 up to I_C = 3A and ≥ 30 at I_C = 5A, supporting stable gain across wide load ranges.

V_CE(SAT) is specified at multiple operating points: 45mV (I_C = 0.5A/I_B = 50mA), 145mV (I_C = 1A/I_B = 20mA), and 160mV (I_C = 1.5A/I_B = 20mA), confirming low on-resistance behavior under design-relevant bias conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum allowable collector-emitter voltage before breakdown in common-emitter configuration
I_C (continuous)	1.5 A - Continuous DC collector current rating defining steady-state switching capacity
R_CE(SAT)	90 mΩ - Equivalent on-resistance at I_C = 1A/I_B = 20mA, directly determining conduction loss
h_FE	200–450 - DC current gain range at I_C = 10–1.5A/V_CE = 2V, critical for base drive sizing
P_D	625 mW - Max steady-state power dissipation on FR4 PCB (25mm × 25mm, 1 oz Cu)
f_T	100–160 MHz - Transition frequency indicating usable bandwidth for high-speed switching
t_off	1128 ns - Turn-off delay limiting maximum switching frequency in hard-switched topologies

Pinout & Package

Package: SOT23 - Surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, UL 94V-0 flammability rating, and 0.008 g mass.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	E	Current return path; connected to ground or low-side reference in common-emitter switch configurations
2 (Base)	B	Control input; requires ~50mA peak drive for full saturation at I_C = 1.5A
3 (Collector)	C	High-side current output; carries load current and supports 80V blocking capability

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan
Low R_CE(SAT)	90 mΩ enables <150 mW conduction loss at 1.5A, reducing thermal load in compact DC-DC layouts
High h_FE up to 5A	Minimum h_FE = 30 at I_C = 5A ensures predictable saturation with modest base drive in pulse applications
Green compound	Halogen- and antimony-free molding compound (<900 ppm Br+Cl, <1000 ppm Sb) meets global environmental compliance mandates

Applications

DC-DC Modules

Power Management Functions

Use Scenario: Step-down converter output stage in industrial PMICs requiring 12V-to-5V conversion at 1A load.

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. typical 0.4V Schottky, improving thermal margin in sealed enclosures.

Use Scenario: Load switch controlling 5V rail to USB peripherals in embedded gateways with hot-swap requirements.

IC Role / Device Role / Timing Role: High-side or low-side discrete switch enabling controlled power sequencing and fault isolation.

Use Value: 80V V_CEO provides headroom for transient suppression, while AEC-Q101 qualification ensures long-term reliability in field-deployed units.

Motor Control and Drive

CCFL Backlighting Inverters

Use Scenario: Half-bridge low-side driver in 24V brushed DC motor controller for HVAC actuators.

IC Role / Device Role / Timing Role: Fast-switching NPN switch handling PWM frequencies up to 20kHz with t_off = 1128ns.

Use Value: Stable h_FE ≥ 170 at I_C = 3A maintains consistent gate drive during stall-current events.

Use Scenario: Resonant inverter switch in LCD monitor CCFL backlight with 40–60kHz operation.

IC Role / Device Role / Timing Role: Primary switching transistor in Royer or push-pull topology driving transformer primary.

Use Value: f_T ≥ 100MHz supports clean square-wave edges at 60kHz, minimizing core losses and EMI generation.

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
ZXTN2012ZTA	V_CEO = 60V, R_CE(SAT) = 120mΩ @ I_C = 1A, h_FE = 200–400	Limited to ≤60V systems; lower thermal robustness (R_θJA = 250°C/W)	Select when cost priority outweighs voltage margin and thermal performance
MMBT6427LT1G	V_CEO = 80V, R_CE(SAT) = 150mΩ @ I_C = 1A, h_FE = 100–300	Higher saturation voltage increases conduction loss by ~65% at 1.5A	Acceptable for non-critical 80V applications where gain consistency at high current is less critical

Compared with ZXTN2012ZTA and MMBT6427LT1G, FMMT620TA delivers superior voltage margin (80V), lowest R_CE(SAT), and highest h_FE stability above 1A-making it optimal for thermally constrained, automotive-qualified, or high-efficiency DC-DC and motor drive designs.

Availability

FMMT620TA is available at Aetrix Electronics and suitable for DC-DC modules, motor control and drive functions, and CCFL backlighting inverters requiring stable component supply, AEC-Q101 compliance, and SOT23 footprint compatibility.

Supply support for FMMT620TA 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.

The FMMT620TA belongs to Diodes' automotive-qualified low-saturation transistor product line, engineered for high-efficiency switching in space-constrained power conversion and motor drive applications.

FAQ

What is the maximum continuous collector current for FMMT620TA?

The FMMT620TA is rated for 1.5A continuous collector current at T_A = +25°C on a standard FR4 PCB (25mm × 25mm, 1 oz copper). Derating applies above 25°C ambient, with full derating to zero at +150°C junction temperature per the published curve.

Is FMMT620TA suitable for automotive applications?

Yes-FMMT620TA is AEC-Q101 qualified and PPAP capable. It meets automotive reliability requirements including temperature cycling, high-temperature reverse bias, and electrostatic discharge testing, and is marked "620" with AEC-Q101 compliance indicated in ordering code FMMT620TA.

What is the typical V_CE(SAT) at 1.5A collector current?

At I_C = 1.5A and I_B = 20mA, V_CE(SAT) is typically 160mV (max 200mV) per the datasheet's electrical characteristics table. This value was measured under pulsed conditions (≤300µs, ≤2% duty cycle) to avoid self-heating effects.

Does FMMT620TA require a heatsink in standard SOT23 mounting?

No external heatsink is required for typical operation within its 625mW steady-state power limit on a 25mm × 25mm FR4 board with 1 oz copper. Thermal resistance is R_θJA = 200°C/W under those conditions, yielding ΔT_J-A ≈ 125°C at full power-well within the -55°C to +150°C operating range.

FMMT620TA 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 @ 50mA, 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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

FMMT620TA FAQ

1.How can I place an order for FMMT620TA through Aetrix?

Please submit a Request for Quotation (RFQ) for FMMT620TA 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 FMMT620TA reliable?

The price and inventory of FMMT620TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT620TA is usually 5 days.

3.What payment methods are accepted for FMMT620TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT620TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FMMT620TA?

FMMT620TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FMMT620TA 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 FMMT620TA?

For technical support, including FMMT620TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT620TA requirements.

6.How does Aetrix verify that FMMT620TA is sourced from the original manufacturer or authorized distributors?

All FMMT620TA 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 FMMT620TA meets industry standards.

7.What is the process for return or replacement of FMMT620TA?

All FMMT620TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT620TA, 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 FMMT620TA part is unused and in its original packaging.

Return procedure for FMMT620TA:

1.Submit a request within 90 days.

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

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