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Diodes Incorporated FMMT614QTA
- Part No.:
- FMMT614QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT614QTA.pdf
- Description:
- TRANS NPN DARL 100V 0.5A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,977
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Product details
Overview
FMMT614QTA from Diodes Incorporated is a 100V NPN Darlington transistor in SOT23 package, designed for automotive-grade medium-power switching. It delivers 500mA continuous collector current, 2A peak pulse current, and 500mW power dissipation, with DC current gain up to 5,000 at IC = 500mA. It is AEC-Q101 qualified and used in engine control module load drivers.
For engineers reviewing the FMMT614QTA datasheet, FMMT614QTA pinout, FMMT614QTA application, or FMMT614QTA equivalent, key selection criteria include VCEO ≥ 100V, hFE ≥ 15k at low current and ≥5k at full rated current, VCE(sat) ≤ 1.0V at IC = 500mA/IB = 5mA, and thermal resistance RθJA = 250°C/W on standard FR4 PCB.
Technical Context
This Darlington pair integrates two NPN transistors in cascade to achieve high current gain while maintaining single-package simplicity. Its BVCEO = 100V and BVCBO = 120V support high-voltage interface isolation in 12V/24V automotive systems.
The device operates across –55°C to +150°C and features ESD HBM rating of 2,000V. Its VBE(sat) = 1.7–1.9V at IC = 500mA/IB = 5mA reflects the stacked base-emitter junction drop inherent to Darlington topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - supports switching of inductive loads in 24V automotive systems without breakdown |
| IC (continuous) | 500 mA - drives solenoids, relays, and small motors directly from microcontroller GPIO |
| hFE | 15k min @ IC = 100mA; 5k min @ IC = 500mA - enables low-base-drive-current operation in space-constrained modules |
| VCE(sat) | 0.9 V typ @ IC = 500mA, IB = 5mA - limits conduction loss to <450 mW at full current |
| RθJA | 250 °C/W - requires minimal copper area (15 mm × 15 mm, 1 oz) for thermal management |
| ESD HBM | 2,000 V - meets automotive assembly handling requirements without additional protection |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin plastic case with matte tin-plated leads, moisture sensitivity level 1, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current return path; connected to ground or low-side reference in common-emitter switch |
| 2 (Base) | B | Control input; requires ~5 mA drive for full saturation at 500 mA collector load |
| 3 (Collector) | C | High-side output node; connects to load supply rail (e.g., battery+) in low-side switch configuration |
Key Features
| Feature | Design Value |
|---|---|
| Darlington architecture | Enables single-transistor replacement for discrete driver+switch stages, reducing board area by >40% vs. dual-SOT23 solution |
| AEC-Q101 qualification | Validated for automotive underhood environments including temperature cycling, humidity, and mechanical shock per JESD47 |
| Green compound & RoHS compliance | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets Tier 1 OEM environmental mandates |
| Low RθJL | 197 °C/W junction-to-lead thermal resistance allows direct solder-point thermal relief in high-reliability layouts |
Applications
| Automotive Door Module Driver | Industrial Relay Interface |
|---|---|
Use Scenario: Driving window lift motor and door lock solenoids in 12V body control units. IC Role / Device Role / Timing Role: Low-side switch controlling inductive loads with flyback protection integrated into PCB layout. Use Value: 100V VCEO withstands load dump transients up to ISO 7637-2 Pulse 5a; 5k hFE reduces MCU GPIO current demand to <1 mA. | Use Scenario: Replacing electromechanical relays in PLC I/O modules for 24V DC field devices. IC Role / Device Role / Timing Role: Solid-state output stage providing fast turn-on (<0.7 µs) and turn-off (<2.5 µs) for real-time control loops. Use Value: Eliminates relay wear-out and contact bounce; 500mW PD allows continuous operation at ambient up to 105°C with derating. |
| LED Headlamp Dimming | Engine Control Unit Fan Driver |
Use Scenario: PWM-controlled current sink for high-brightness LED arrays in adaptive front lighting systems. IC Role / Device Role / Timing Role: Constant-current switch operating at 1–10 kHz PWM frequency with minimal VCE(sat) variation. Use Value: 0.9 V typical VCE(sat) ensures >95% efficiency at 500 mA; 2A ICM handles startup surge currents. | Use Scenario: Controlling brushless fan motors in engine coolant and HVAC subsystems. IC Role / Device Role / Timing Role: High-voltage interface between 3.3V microcontroller and 12V/24V motor windings. Use Value: 120V VCBO prevents breakdown during back-EMF spikes; –55°C to +150°C TJ range matches under-hood thermal envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX1048A | Higher VCEO = 120V but lower hFE = 1k–2k; TO-92 package, not SOT23 | Not suitable for automated SMT assembly; larger footprint limits density in compact ECUs | Select only if higher voltage margin outweighs SMT compatibility and gain requirements |
| BC817-40 | Standard BJT (not Darlington); hFE = 250–630; VCEO = 45V | Cannot replace FMMT614QTA in 100V applications; requires external base resistor network for same gain | Use only in low-voltage (<30V), high-speed switching where Darlington delay is unacceptable |
Compared with ZTX1048A and BC817-40, FMMT614QTA uniquely combines AEC-Q101 qualification, SOT23 footprint, 100V capability, and Darlington-level gain-making it the only drop-in solution for space-constrained, high-reliability automotive switches requiring single-device simplicity.
Availability
FMMT614QTA is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC outputs, LED lighting drivers, and engine management systems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for FMMT614QTA 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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.
FMMT614QTA belongs to Diodes' AEC-Q101-qualified bipolar transistor portfolio, engineered specifically for robust, high-voltage switching in automotive under-hood and chassis applications where reliability and thermal stability are critical.
FAQ
What is the maximum safe operating temperature for FMMT614QTA?
The FMMT614QTA has an operating junction temperature range of –55°C to +150°C. At ambient temperatures above 70°C, power dissipation must be linearly derated from 500 mW using the 250°C/W RθJA value. On a 15 mm × 15 mm, 1 oz copper PCB, full-rated current is sustainable up to +85°C ambient.
Does FMMT614QTA require a base current limiting resistor when driven by a 3.3V microcontroller?
Yes. With VBE(sat) ≈ 1.7–1.9V and required IB = 5 mA for full saturation at IC = 500 mA, a 3.3V GPIO needs a series resistor of approximately 300 Ω to limit base current. Lower drive (e.g., 100 mA IC) permits higher resistance (e.g., 1.5 kΩ), reducing MCU loading.
Can FMMT614QTA replace a mechanical relay in 24V DC applications?
Yes, for resistive and moderately inductive loads up to 500 mA continuous. Its 100V VCEO withstands typical 24V system transients, and built-in Darlington gain eliminates need for external driver stages. Flyback diode must still be added externally across inductive loads per standard practice.
Is FMMT614QTA pin-compatible with other SOT23 NPN transistors?
No. While physically compatible with SOT23 footprints, its Darlington structure results in different electrical behavior: higher VBE(on), slower switching, and no direct functional equivalence to standard BJTs like BC817 or MMBT2222A. Pin numbering (E-B-C) matches JEDEC SOT23 but circuit design must account for Darlington-specific characteristics.
FMMT614QTA 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 - Darlington
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 5mA, 500mA
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 15000 @ 100mA, 5V
- Power - Max:
- 500 mW
- Frequency - Transition:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT614QTA FAQ
1.How can I place an order for FMMT614QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT614QTA 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 FMMT614QTA reliable?
The price and inventory of FMMT614QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT614QTA is usually 5 days.
3.What payment methods are accepted for FMMT614QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT614QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT614QTA?
FMMT614QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT614QTA 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 FMMT614QTA?
For technical support, including FMMT614QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT614QTA requirements.
6.How does Aetrix verify that FMMT614QTA is sourced from the original manufacturer or authorized distributors?
All FMMT614QTA 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 FMMT614QTA meets industry standards.
7.What is the process for return or replacement of FMMT614QTA?
All FMMT614QTA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT614QTA, 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 FMMT614QTA part is unused and in its original packaging.
Return procedure for FMMT614QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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