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Diodes Incorporated FMMT614TC
- Part No.:
- FMMT614TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT614TC.pdf
- Description:
- TRANS NPN DARL 100V 0.5A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,991
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Product details
Overview
FMMT614TC from Diodes Incorporated is a 100V NPN Darlington transistor in SOT23 package, delivering 500mA continuous collector current, 2A peak pulse current, and 500mW power dissipation. It features high DC current gain (hFE up to 5,000 at IC = 500mA) and AEC-Q101 qualification for automotive-grade reliability, used in medium-power switching and interface driver circuits.
For engineers reviewing the FMMT614TC datasheet, FMMT614TC pinout, FMMT614TC application, or FMMT614TC equivalent, key selection criteria include VCEO = 100V, hFE ≥ 15k at IC = 100mA, VCE(SAT) ≤ 1.0V at IC = 500mA/IB = 5mA, thermal resistance RθJA = 250°C/W, and SOT23 mechanical compatibility with space-constrained PCB layouts.
Technical Context
This Darlington pair integrates two NPN transistors in cascade to achieve high current gain while maintaining single-device simplicity. Its 100V VCEO rating enables use in industrial control interfaces and automotive load switching where moderate voltage isolation is required.
The device operates across –55°C to +150°C, supports pulsed switching with tON ≤ 0.7µs and tOFF ≤ 2.5µs, and exhibits low leakage: ICBO ≤ 10nA at VCB = 100V and ICES ≤ 10µA at VCE = 100V - critical for standby power integrity in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Enables safe operation in 48V industrial bus and 12V/24V automotive supply rails with margin. |
| IC (cont.) | 500 mA - Supports direct driving of relays, small solenoids, and LED arrays without external amplification. |
| hFE | 15k min @ IC = 100mA - Reduces base drive current requirements, easing microcontroller GPIO loading. |
| VCE(SAT) | 0.9 V max @ IC = 500mA, IB = 5mA - Limits conduction loss to ≤450mW under full load, aiding thermal management. |
| RθJA | 250 °C/W - Requires minimal copper area (15mm × 15mm 1oz FR4) to maintain junction temperature <125°C at 500mW. |
| ESD HBM | 2,000 V - Provides robust handling during automated assembly and board-level integration. |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal plastic package with 0.915mm nominal lead pitch, UL 94V-0 rated molding compound, and matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current return path; tied to ground or low-side reference in common-emitter switching. |
| 2 (Base) | B | Control input; requires ~5mA drive for full saturation at 500mA collector load. |
| 3 (Collector) | C | High-side output node; connects to load supply rail and switched load (e.g., relay coil). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics. |
| Darlington architecture | Delivers hFE > 15k at low IC, enabling direct MCU GPIO drive without external bias resistors. |
| Green construction | Halogen- and antimony-free, RoHS-compliant materials (<900ppm Br/Cl, <1000ppm Sb). |
| Moisture sensitivity Level 1 | No bake preconditioning required before reflow; compatible with standard SMT assembly lines. |
Applications
| Automotive Body Control Module | Industrial Relay Driver |
|---|---|
Use Scenario: Switching 12V/24V solenoid valves and lamp loads in door lock actuators and HVAC dampers. IC Role / Device Role / Timing Role: Medium-power NPN Darlington switch providing galvanic isolation between MCU outputs and inductive loads. Use Value: 100V VCEO withstands load dump transients; 500mA IC handles typical valve coils; AEC-Q101 ensures field reliability. | Use Scenario: Driving 5–10W electromagnetic relays in PLC I/O modules and motor starters. IC Role / Device Role / Timing Role: High-gain switching element replacing discrete BJT pairs to reduce component count and layout area. Use Value: hFE ≥ 15k at 100mA reduces base current to <7µA, minimizing microcontroller port loading and PCB trace losses. |
| LED Array Power Switch | Power Supply Enable Circuit |
Use Scenario: On/off control of multi-segment LED lighting strips in commercial signage and instrumentation panels. IC Role / Device Role / Timing Role: Low-saturation, high-current switch interfacing between logic-level enable signals and 500mA LED strings. Use Value: VCE(SAT) ≤ 0.9V limits power loss to <450mW, avoiding thermal derating below ambient 85°C. | Use Scenario: Enabling auxiliary 5V/3.3V rails in embedded power supplies via microcontroller-controlled sequencing. IC Role / Device Role / Timing Role: Low-leakage, high-voltage pass transistor ensuring clean startup/shutdown of downstream regulators. Use Value: ICES ≤ 10µA at VCE = 100V prevents unintended rail activation during deep sleep modes. |
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, SOT23 package | Limited to ≤48V systems; lower gain requires higher base drive current | Use only where voltage stress remains <60V and base drive capability exceeds 10mA. |
| MMDT3904 | Single NPN (not Darlington), VCEO = 40V, hFE = 100–300, dual SOT363 | Cannot replace FMMT614TC directly due to lower voltage, gain, and current ratings | Acceptable only in low-voltage, low-current signal switching - not for power switching roles. |
Compared with ZTX1048A and MMDT3904, FMMT614TC uniquely combines 100V rating, Darlington-level gain, and SOT23 footprint - making it irreplaceable in space-constrained, medium-voltage industrial and automotive switching where both voltage margin and drive efficiency matter.
Availability
FMMT614TC is available at Aetrix Electronics and suitable for automotive body control modules, industrial relay drivers, LED array power switches, and power supply enable circuits requiring stable component supply and AEC-Q101 compliance.
Supply support for FMMT614TC 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 consumer markets.
The FMMT614TC belongs to Diodes' AEC-Q101-qualified discrete transistor product line, engineered for robust medium-power switching in harsh environments with emphasis on voltage margin, thermal stability, and assembly compatibility.
FAQ
What is the maximum allowable junction temperature for FMMT614TC?
The FMMT614TC has an operating junction temperature range of –55°C to +150°C. At TA = +25°C and PD = 500mW on a 15mm × 15mm 1oz FR4 PCB, junction temperature rise is 125°C (250°C/W × 0.5W), resulting in TJ = 150°C - the absolute maximum. Derating is required above +25°C ambient.
Is FMMT614TC pin-compatible with standard SOT23 NPN transistors?
Yes - FMMT614TC uses standard SOT23 pinout (Emitter-Base-Collector on pins 1-2-3), matching industry-standard layout footprints. However, its Darlington structure means base current requirements and saturation behavior differ significantly from single NPN devices like BC847 or MMBT3904.
Does FMMT614TC require a base resistor when driven by a 3.3V microcontroller GPIO?
Yes - a base resistor is required to limit IB. For full saturation at IC = 500mA, IB ≈ 5mA is needed. With 3.3V GPIO and VBE(SAT) ≈ 1.7V, a 330Ω resistor yields IB ≈ 4.8mA, satisfying drive requirements while protecting the MCU pin.
How does FMMT614TC handle inductive load flyback energy?
FMMT614TC has no integrated flyback diode. When switching inductive loads, an external freewheeling diode (e.g., 1N4148) must be placed across the load with cathode to VCC and anode to collector. This prevents VCE spikes exceeding 100V that could cause avalanche breakdown or device failure.
FMMT614TC 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT614TC FAQ
1.How can I place an order for FMMT614TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT614TC 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 FMMT614TC reliable?
The price and inventory of FMMT614TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT614TC is usually 5 days.
3.What payment methods are accepted for FMMT614TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT614TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT614TC?
FMMT614TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT614TC 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 FMMT614TC?
For technical support, including FMMT614TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT614TC requirements.
6.How does Aetrix verify that FMMT614TC is sourced from the original manufacturer or authorized distributors?
All FMMT614TC 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 FMMT614TC meets industry standards.
7.What is the process for return or replacement of FMMT614TC?
All FMMT614TC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT614TC, 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 FMMT614TC part is unused and in its original packaging.
Return procedure for FMMT614TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT614TC Tags
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MMBT3906LT1G
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MMBT3904-7-F
Diodes Incorporated
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Diodes Incorporated
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Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC847B,215
Nexperia USA Inc.
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MMBT2222A-TP
Micro Commercial Co
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