FMMT614TA Diodes Inc. Transistor BJT NPN (SOT23 (3-Pin)) In Stock
Diodes Inc. FMMT614TA is a Darlington NPN transistor in SOT-23 package, featuring 100 V collector-emitter voltage, 500 mA collector current, and exceptional DC current gain of 5000 minimum, ideal for high-gain switching and signal amplification applications.
- Manufacturer
- Diodes Inc.
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- FMMT614TA Datasheet PDF
- Category
- Transistor BJT NPN
- Price
- From $0.1260(MOQ 19)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Darlington configuration delivers minimum DC current gain (hFE) of 5000 for ultra-high sensitivity switching
- 100 V collector-emitter breakdown voltage enables use in higher-voltage load switching circuits
- 500 mA collector current capacity handles relay coils, LED arrays, and small motor drives
- Compact SOT-23 3-pin package minimizes PCB footprint in space-constrained designs
- Single-element construction simplifies drive circuit design compared to discrete Darlington pairs
Applications
The FMMT614TA is used in high-gain switching circuits where a microcontroller GPIO or low-level signal must drive moderate loads such as relays, solenoids, and LED indicator arrays. Its Darlington configuration with 5000 minimum hFE allows a base drive current of just 100 µA to switch full 500 mA collector currents, making it ideal for sensor output stages and logic-level switching interfaces. The component also suits audio pre-amplifier stages and Darlington driver circuits in industrial control and consumer electronics designs.
Specifications
| Pbfree Code | Yes |
| Factory Lead Time | 12Weeks |
| YTEOL | 7 |
| Collector Current-Max (IC) | 0.5A |
| Collector-Emitter Voltage-Max | 100V |
| Configuration | DARLINGTON |
| DC Current Gain-Min (hFE) | 5000 |
| JESD-30 Code | R-PDSO-G3 |
| JESD-609 Code | e3 |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Polarity/Channel Type | NPN |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Transistor Application | SWITCHING |
| Transistor Element Material | SILICON |
| Transition Frequency-Nom (fT) | 100MHz |
| Package | SOT23 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
With a 5000 minimum hFE, how small a base current is needed to fully switch the FMMT614TA at 500 mA collector current?
With a minimum DC current gain of 5000, the FMMT614TA requires a theoretical base current of only 0.1 mA (100 µA) to drive a full 500 mA collector current. In practice, designers use a base current of 0.5 mA to 1 mA to account for gain variation and ensure saturation, still an extremely low drive requirement achievable directly from 3.3 V or 5 V logic outputs through a simple base resistor.
Can the FMMT614TA switch a 12 V relay coil directly from a 3.3 V microcontroller GPIO pin?
Yes, the FMMT614TA can switch a 12 V relay coil drawing up to 100 mA from a 3.3 V microcontroller GPIO, well within its 100 V collector-emitter and 500 mA collector ratings. The GPIO sources a base current of approximately 0.5 mA through a 5.6 kΩ base resistor, which combined with the 5000 minimum hFE provides sufficient saturation. A flyback diode across the relay coil is still required to suppress inductive voltage spikes during turn-off.
How does the FMMT614TA Darlington topology compare to a standard NPN transistor for low-current input signal switching?
Unlike a standard single NPN transistor with typical hFE of 100 to 300, the FMMT614TA Darlington achieves minimum hFE of 5000 by cascading two transistor junctions internally, multiplying the gain of each stage. This allows detection of input currents as low as 10 µA to trigger reliable output switching at 100 mA, making it suitable for current-mode sensor outputs, photodiode receivers, and touch-sensitive circuits where the input drive is severely limited.
What is the saturated collector-emitter voltage of the FMMT614TA, and how does it affect power dissipation in a 12 V switching circuit?
Darlington transistors like the FMMT614TA typically exhibit a collector-emitter saturation voltage (VCE(sat)) of approximately 1.0 V to 1.5 V due to the double base-emitter junction stack, higher than a single BJT's 0.2 V to 0.3 V. At 500 mA collector current in a 12 V switching circuit, this results in 0.5 W to 0.75 W of on-state power dissipation, which must be managed within the SOT-23 package thermal limits of approximately 300 mW at 25°C ambient without heatsinking.
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About Diodes Inc.
Diodes Inc. is a leading electronic component manufacturer. FindMyChip sources Diodes Inc. ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 19+ | $0.1505 | $2.86 |
| 3000+ | $0.1260 | $378.00 |
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