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Diodes Incorporated FMMT614QTC
- Part No.:
- FMMT614QTC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT614QTC.pdf
- Description:
- TRANS NPN DARL 100V 0.5A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,809
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Product details
Overview
FMMT614QTC 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 modules and body electronics.
For engineers reviewing the FMMT614QTC datasheet, FMMT614QTC pinout, FMMT614QTC application, or FMMT614QTC equivalent, key selection criteria include VCEO ≥ 100V, hFE ≥ 15k at low current, VCE(sat) ≤ 0.9V at 500mA/5mA drive, thermal resistance RθJA = 250°C/W on FR4, and automotive qualification status.
Technical Context
This Darlington pair integrates two NPN transistors in cascade to achieve high current gain while maintaining single-package simplicity. Its 100V VCEO rating enables use in 24V automotive supply rails with margin, and its 10V VEBO supports base biasing without external clamping in typical driver configurations.
The device operates across –55°C to +150°C junction temperature range and features 2kV HBM ESD robustness. Its SOT23 footprint allows compact placement in space-constrained ECUs, and its 0.008g mass supports lightweight module design requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Supports 24V automotive systems with ≥4× overvoltage margin against load-dump transients |
| IC (cont.) | 500 mA - Drives solenoids, relays, or LED arrays directly without external amplification |
| hFE | 15k min @ IC = 100mA - Enables low-base-drive operation in microcontroller GPIO-driven circuits |
| VCE(sat) | 0.9 V max @ IC = 500mA, IB = 5mA - Limits conduction loss to ≤450mW under full load |
| RθJA | 250 °C/W - Requires ≥15 mm × 15 mm 1 oz copper pad for full 500mW dissipation at TA = 25°C |
| ESD HBM | 2,000 V - Meets IEC 61000-4-2 Level 2 for handling and board assembly in production |
Pinout & Package
Package: SOT23 - Surface-mount plastic case, 0.008 g weight, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Reference node for current return path; connected to ground or low-side return in switch configurations |
| 2 (Base) | B | Control input requiring ~5mA drive for full saturation; internal base resistor not present |
| 3 (Collector) | C | High-side switched output node; connects to load anode or 24V rail in low-side switch topology |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, vibration, and humidity testing |
| Darlington architecture | Delivers hFE ≥ 15k at 100mA, reducing required MCU GPIO drive strength by >10× vs. single BJT |
| Lead-free & Green | Meets RoHS 2 and halogen/antimony-free definitions (<900ppm Br/Cl, <1000ppm Sb), supporting end-of-life compliance |
| PPAP capable | Supplied with full production part approval process documentation for Tier-1 automotive sourcing |
Applications
| Engine Control Unit (ECU) Solenoid Driver | Body Control Module (BCM) Relay Interface |
|---|---|
Use Scenario: Driving fuel injector solenoids in 24V diesel engine management systems. IC Role / Device Role / Timing Role: Medium-power NPN Darlington switch controlling 300–500mA inductive loads with µs-scale turn-on/off timing. Use Value: High hFE ensures full saturation with standard 5V MCU GPIO drive, eliminating need for discrete base resistors or driver ICs. | Use Scenario: Controlling HVAC blower relays and door lock actuators in vehicle body electronics. IC Role / Device Role / Timing Role: Low-side switch enabling PWM-controlled relay coil energization with fast 0.7µs turn-on. Use Value: 100V VCEO provides margin against 120V load-dump spikes, reducing need for external TVS protection. |
| LED Headlamp Dimming Circuit | Power Distribution Unit (PDU) Status Indicator |
Use Scenario: PWM dimming of auxiliary LED headlamps in adaptive lighting systems. IC Role / Device Role / Timing Role: Constant-current switch operating at 1–10kHz PWM frequency with minimal VCE(sat) conduction loss. Use Value: 0.9V VCE(sat) limits power loss to ≤450mW at 500mA, enabling direct PCB mounting without heatsink. | Use Scenario: Driving status LEDs on high-voltage battery disconnect units in EV power distribution systems. IC Role / Device Role / Timing Role: Logic-level controlled indicator driver interfacing between isolated MCU domain and 48V+ HV bus monitoring circuitry. Use Value: 150°C max TJ rating allows reliable operation near HV MOSFETs without thermal derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX1048A | VCEO = 80V, hFE = 1000–4000, SOT89 package | Lacks AEC-Q101 qualification; lower voltage rating limits use in 24V load-dump environments | Select only for non-automotive industrial controls where 80V margin suffices |
| BCX38C | VCEO = 60V, hFE = 250–630, TO-92 package | Not automotive-qualified; through-hole mounting increases PCB area and assembly cost | Use only in legacy designs or cost-sensitive consumer applications without reliability requirements |
Compared with ZTX1048A and BCX38C, FMMT614QTC uniquely combines AEC-Q101 qualification, 100V rating, and SOT23 footprint-enabling drop-in replacement in space-constrained automotive modules without redesigning thermal or layout margins.
Availability
FMMT614QTC is available at Aetrix Electronics and suitable for engine control units, body control modules, LED lighting drivers, and power distribution units requiring stable component supply across automotive production lifecycles.
Supply support for FMMT614QTC 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.
FMMT614QTC belongs to Diodes' AEC-Q101-qualified bipolar transistor product line, engineered specifically for medium-power switching in harsh-environment automotive electronics.
FAQ
What is the maximum allowable junction temperature for FMMT614QTC?
The absolute maximum junction temperature is +150°C, validated per AEC-Q101 stress testing. Operation above this limit risks permanent degradation of hFE and increased leakage. Derating begins at +25°C ambient, with full 500mW power dissipation permitted only when RθJA is maintained at 250°C/W via proper PCB copper area.
Does FMMT614QTC include an integrated base resistor?
No, FMMT614QTC is a bare Darlington transistor without internal base resistors. External base drive must be provided-typically 5mA for full saturation at 500mA collector current. This allows flexible biasing for linear or switching operation but requires explicit current-limiting design in the base path.
Can FMMT614QTC replace a standard single NPN transistor in existing designs?
Yes, but only if the original design accommodates Darlington characteristics: higher VBE(on) (~1.5–1.8V), slower switching (ton/toff ~0.7/2.5µs), and no internal base-emitter shunt. Layout changes may be needed to ensure adequate base drive current and thermal relief, especially in high-frequency PWM applications.
Is FMMT614QTC suitable for high-frequency switching above 100kHz?
No-it is optimized for medium-speed switching (≤50kHz). Its Darlington structure introduces minority-carrier storage delay, resulting in 2.5µs turn-off time. For >100kHz operation, consider MOSFET alternatives like DMN3025LSD or SiC devices with nanosecond switching and zero gate charge requirements.
FMMT614QTC 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
FMMT614QTC FAQ
1.How can I place an order for FMMT614QTC through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT614QTC 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 FMMT614QTC reliable?
The price and inventory of FMMT614QTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT614QTC is usually 5 days.
3.What payment methods are accepted for FMMT614QTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT614QTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT614QTC?
FMMT614QTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT614QTC 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 FMMT614QTC?
For technical support, including FMMT614QTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT614QTC requirements.
6.How does Aetrix verify that FMMT614QTC is sourced from the original manufacturer or authorized distributors?
All FMMT614QTC 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 FMMT614QTC meets industry standards.
7.What is the process for return or replacement of FMMT614QTC?
All FMMT614QTC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT614QTC, 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 FMMT614QTC part is unused and in its original packaging.
Return procedure for FMMT614QTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT614QTC Tags
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