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Diodes Incorporated FMMT614TA
- Part No.:
- FMMT614TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT614TA.pdf
- Description:
- TRANS NPN DARL 100V 0.5A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:43,896
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Product details
Overview
FMMT614TA from Diodes Incorporated is a 100V NPN Darlington transistor in SOT23 package, delivering 500mA continuous collector current, 2A peak pulse capability, 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, commonly used in high-voltage switching circuits such as LED drivers and relay interface stages.
For engineers reviewing the FMMT614TA datasheet, FMMT614TA pinout, FMMT614TA application, or FMMT614TA equivalent, key selection considerations include VCEO = 100V, hFE ≥ 15k (at IC = 100mA), VCE(SAT) ≤ 0.9V (IC = 500mA, IB = 5mA), thermal resistance RθJA = 250°C/W, and SOT23 footprint 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-package simplicity. Its 100V VCEO rating enables use in off-line auxiliary supplies and industrial control inputs where isolation and voltage margin are critical.
The device operates with low base drive requirements due to hFE > 15,000 at 100mA and supports fast switching with tON ≤ 0.7µs and tOFF ≤ 2.5µs under specified test conditions, making it suitable for moderate-frequency digital switching rather than RF or linear amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Maximum collector-emitter voltage before breakdown; enables use in 48V+ industrial bus interfaces |
| IC (continuous) | 500 mA - Sustained load switching capability without forced cooling on standard FR4 |
| hFE | 15k min @ IC = 100mA - Reduces required base drive current to ~6.7µA for 100mA output |
| VCE(SAT) | 0.9 V max @ IC = 500mA, IB = 5mA - Limits conduction loss to ≤450mW at full rated current |
| RθJA | 250 °C/W - Requires derating above 85°C ambient; full 500mW dissipation only at TA ≤ 65°C |
| ESD HBM | 2,000 V - Supports handling in standard assembly environments without special ESD controls |
Pinout & Package
Package: SOT23 - surface-mount plastic case, 0.008g weight, UL 94V-0 rated molding compound, matte tin-plated leads solderable per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitting terminal of Darlington pair | Connected to ground or low-side return path; carries full load current |
| 2 (Base) | Control input for Darlington pair | Accepts low-current logic-level drive; internal resistor not present |
| 3 (Collector) | High-side switching node | Connects to load and supply rail; withstands up to 100V when off |
Key Features
| Feature | Design Value |
|---|---|
| Darlington architecture | Two-stage NPN cascade enabling hFE > 15k at low IC, reducing base drive burden |
| AEC-Q101 qualification | Validated for automotive temperature range (−55°C to +150°C) and reliability stress tests |
| Green construction | Halogen- and antimony-free, <900ppm Br/Cl, <1000ppm Sb - compliant with EU environmental directives |
| SOT23 footprint | Standardized 3-pin outline (2.9mm × 1.3mm × 1.0mm) compatible with automated pick-and-place and reflow |
Applications
| Industrial Relay Drivers | Automotive LED Tail Light Switching |
|---|---|
Use Scenario: Driving 24V relay coils requiring 40–100mA hold current in PLC I/O modules. IC Role / Device Role / Timing Role: High-gain switch controlling coil energization/de-energization with microcontroller GPIO. Use Value: Eliminates need for external driver stage; VCEO = 100V provides 4× safety margin over 24V rail. |
Use Scenario: Switching 12V LED arrays in rear lighting clusters with PWM dimming. IC Role / Device Role / Timing Role: Low-side constant-current switch synchronized to vehicle CAN-based lighting controller. Use Value: hFE ≥ 15k ensures <10µA base current suffices for 150mA LED load, minimizing MCU port loading. |
| Off-Line Auxiliary Power Supplies | Smoke Detector Alarm Drivers |
Use Scenario: Controlling startup bleeder resistors or HV bias paths in AC/DC flyback converters. IC Role / Device Role / Timing Role: High-voltage switch enabling controlled discharge of bulk capacitors during standby. Use Value: BVCEO = 100V and BVCBO = 120V support direct connection to rectified 85–265VAC inputs with margin. |
Use Scenario: Activating piezoelectric sounders or buzzer loads during alarm events in battery-powered detectors. IC Role / Device Role / Timing Role: Pulse-driven load switch triggered by low-power microcontroller wake-up interrupt. Use Value: ICM = 2A peak handles 100ms buzzer surge currents while RθJA = 250°C/W permits operation in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX1048A | VCEO = 80V, hFE = 10k min @ IC = 500mA, SOT23 package | Limited to ≤48V systems; lower gain increases base drive requirement | Select when cost sensitivity outweighs 20V voltage margin need |
| MMDT3904 | Single NPN, VCEO = 40V, hFE = 100–300, dual SOT363 | Not a Darlington; requires external gain stage for equivalent drive reduction | Choose only if system voltage ≤24V and board space allows added components |
Compared with ZTX1048A and MMDT3904, FMMT614TA uniquely delivers 100V blocking with Darlington-level gain in a single SOT23 device-enabling compact, high-margin designs in industrial and automotive switching where voltage headroom and drive efficiency are jointly critical.
Availability
FMMT614TA is available at Aetrix Electronics and suitable for industrial relay drivers, automotive LED tail light switching, and off-line auxiliary power supplies requiring stable component supply across extended product lifecycles.
Supply support for FMMT614TA 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, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
FMMT614TA belongs to Diodes' high-reliability discrete transistor portfolio, engineered specifically for automotive and industrial switching applications demanding AEC-Q101 compliance, high-voltage tolerance, and robust thermal performance in miniature packages.
FAQ
Is FMMT614TA pin-compatible with standard SOT23 NPN transistors?
No. While physically packaged in SOT23, FMMT614TA uses emitter-base-collector (E-B-C) pinout, unlike common NPN transistors (E-C-B). Misalignment risks circuit failure. Always verify top-view marking "614" and match pin 1 to emitter per Diodes' DS33109 Rev. 4–2 Figure 2.
What is the maximum safe operating temperature for continuous 500mA current?
At IC = 500mA and PD = 450mW (based on VCE(SAT) ≈ 0.9V), junction temperature must stay ≤150°C. With RθJA = 250°C/W, maximum ambient is 65°C on a 15mm × 15mm 1oz FR4 PCB. Derate linearly above that-e.g., 50°C ambient allows full 500mA.
Does FMMT614TA include an integrated base resistor?
No. FMMT614TA is a bare Darlington transistor with no built-in base resistor. External base current limiting is mandatory-e.g., a 47kΩ resistor from 3.3V GPIO yields ~64µA IB, sufficient for ≤1A load given hFE ≥ 15k.
How does FMMT614TA differ from the automotive-grade FMMT614Q?
FMMT614Q is identical electrically and mechanically but undergoes additional AEC-Q101 stress testing (including HTSL, TC, UHAST) and ships with full PPAP documentation. FMMT614TA meets AEC-Q101 but lacks automotive traceability and qualification records required for Tier-1 automotive programs.
FMMT614TA 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
FMMT614TA FAQ
1.How can I place an order for FMMT614TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT614TA 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 FMMT614TA reliable?
The price and inventory of FMMT614TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT614TA is usually 5 days.
3.What payment methods are accepted for FMMT614TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT614TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT614TA?
FMMT614TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT614TA 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 FMMT614TA?
For technical support, including FMMT614TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT614TA requirements.
6.How does Aetrix verify that FMMT614TA is sourced from the original manufacturer or authorized distributors?
All FMMT614TA 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 FMMT614TA meets industry standards.
7.What is the process for return or replacement of FMMT614TA?
All FMMT614TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT614TA, 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 FMMT614TA part is unused and in its original packaging.
Return procedure for FMMT614TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT614TA Tags
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