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Diodes Incorporated FMMT495QTA
- Part No.:
- FMMT495QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT495QTA.pdf
- Description:
- TRANS NPN 150V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
FMMT495QTA from Diodes Incorporated is a 150V NPN silicon planar medium-power transistor in SOT23 package, rated for 1A continuous collector current, 150V VCEO, and 500mW power dissipation. It delivers high-current gain (hFE ≥100 at IC = 250mA) and is AEC-Q101 qualified for automotive applications including load switching in engine control modules.
For engineers reviewing the FMMT495QTA datasheet, FMMT495QTA pinout, FMMT495QTA application, or FMMT495QTA equivalent, key selection criteria include breakdown voltage margin (150V VCEO), pulse current capability (2A ICM), thermal resistance (RθJA = 250°C/W), and automotive qualification status.
Technical Context
This NPN bipolar junction transistor operates as a medium-power switch with fully characterized hFE up to 1A, enabling stable gain in high-current linear and switching modes. Its 170V VCBO and 7V VEBO support robust blocking in inductive load circuits.
The device uses planar silicon construction with green molding compound (UL 94V-0), matte tin-plated leads, and meets J-STD-020 moisture sensitivity Level 1. Thermal performance is specified for 15mm × 15mm FR4 PCB with 1 oz copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 150 V - Maximum safe collector-emitter voltage before breakdown under operating conditions |
| IC (continuous) | 1 A - Continuous DC collector current rating at TA = 25°C, defining steady-state switching capacity |
| PD | 500 mW - Max power dissipation on standard FR4 board; derates linearly above 25°C ambient |
| hFE @ IC = 1A | ≥10 - Minimum current gain at full-rated current, ensuring drive efficiency in saturated switching |
| VCE(sat) @ IC = 500mA | ≤0.3 V - Low saturation voltage reduces conduction loss and self-heating during on-state operation |
| fT | 100 MHz - Transition frequency confirming usable bandwidth for medium-speed switching (e.g., PWM up to ~10 MHz) |
| ESD HBM | 4000 V - Robust electrostatic discharge immunity per JEDEC JESD22-A114, supporting automated assembly |
Pinout & Package
Package: SOT23 - surface-mount plastic package with 3-pin configuration, 0.008 g mass, UL 94V-0 flammability rating, and moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Reference node for base drive; connects to ground or low-side return path in common-emitter switches |
| 2 (Base) | Control input | Receives current-limited drive signal; requires ≥50mA peak for full saturation at 500mA collector load |
| 3 (Collector) | Current source terminal | Connects to load and supply rail; handles full switched current and voltage transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood environments (−40°C to +125°C case temperature, 1000h HTOL) |
| High VCEO margin | 150V rating provides >2× safety margin over 12V/24V automotive battery surge profiles (e.g., load dump) |
| Characterized hFE up to 1A | Guaranteed minimum gain at full rated current enables predictable base drive design without overdesign |
| Green, RoHS-compliant construction | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets automotive environmental mandates |
Applications
| Automotive Engine Control | Industrial Solenoid Driver |
|---|---|
Use Scenario: Switching fuel injector coils in gasoline direct injection systems with 12–14V supply and inductive kickback up to 100V. IC Role / Device Role / Timing Role: NPN medium-power switch controlling coil energization/de-energization timing with precise duty-cycle control. Use Value: 150V VCEO withstands flyback spikes; 2A ICM supports short-pulse injector actuation without secondary breakdown. | Use Scenario: Driving 24V DC solenoids in factory automation valves with intermittent 500ms on-time and thermal cycling. IC Role / Device Role / Timing Role: High-reliability discrete switch interfacing microcontroller GPIO to inductive load via base resistor network. Use Value: AEC-Q101 qualification ensures long-term stability; RθJA = 250°C/W allows operation at 85°C ambient with minimal heatsinking. |
| LED Headlamp Dimming | Power Supply OR-ing |
Use Scenario: PWM dimming of high-brightness LED strings in automotive headlamps using constant-current topology. IC Role / Device Role / Timing Role: Low-saturation switch in the current-sense feedback path or as a shunt regulator element. Use Value: VCE(sat) ≤0.3V at 500mA minimizes power loss and thermal rise in compact lamp housings. | Use Scenario: Reverse-polarity protection and OR-ing diode replacement in dual-rail 12V power supplies for infotainment systems. IC Role / Device Role / Timing Role: NPN configured as active diode controller to reduce forward drop versus Schottky solutions. Use Value: 100MHz fT enables fast turn-off for transient load sharing; 4kV ESD HBM prevents assembly damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | VCEO = 100V, hFE min = 100 @ IC = 500mA, PD = 1W (SOT89) | Lower voltage rating; higher power dissipation but larger footprint | Select when >100V blocking not required and board space allows SOT89 |
| MMBT4401 | VCEO = 40V, IC = 600mA, hFE min = 100 @ IC = 150mA, SOT23 | Not suitable for 12V automotive surge environments due to insufficient VCEO margin | Only acceptable in low-voltage consumer applications with strict cost constraints |
Compared with ZTX653 and MMBT4401, FMMT495QTA uniquely combines AEC-Q101 qualification, 150V blocking, and SOT23 footprint-enabling automotive-grade reliability in space-constrained designs where voltage margin and qualification are non-negotiable.
Availability
FMMT495QTA is available at Aetrix Electronics and suitable for automotive engine control, industrial solenoid drivers, LED headlamp dimming, and power supply OR-ing requiring stable component supply across production lifecycles.
Supply support for FMMT495QTA 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.
FMMT495QTA belongs to Diodes' AEC-Q101-qualified medium-power transistor family, engineered specifically for automotive and industrial switching applications demanding high voltage tolerance, thermal robustness, and long-term reliability.
FAQ
What is the maximum allowable junction temperature for FMMT495QTA?
The FMMT495QTA has an operating junction temperature range of −55°C to +150°C. Its absolute maximum TJ is 150°C, and sustained operation above this limit risks permanent degradation. Derating begins at 25°C ambient, with power dissipation reduced by 2 mW/°C above that point per the RθJA = 250°C/W specification.
Is FMMT495QTA pin-compatible with standard SOT23 NPN transistors like MMBT2222A?
Yes-FMMT495QTA uses the standard SOT23 pinout (Emitter-Base-Collector on pins 1-2-3), matching MMBT2222A, BC847, and other 3-lead SOT23 NPN devices. However, its 150V VCEO and AEC-Q101 qualification make it functionally superior in automotive environments where those features are required.
Can FMMT495QTA be used in linear amplifier configurations?
While primarily optimized for switching, FMMT495QTA supports linear operation within its Safe Operating Area (SOA) limits. At VCE = 10V and IC = 100mA, it delivers hFE ≈ 250, but power dissipation must remain ≤500mW and junction temperature below 150°C-requiring careful thermal design and bias stabilization.
Does FMMT495QTA require external protection components when driving inductive loads?
Yes-a flyback diode (e.g., 1N4148 or BAT54) is strongly recommended across the inductive load to clamp VCE spikes exceeding 150V. Although the transistor's 170V VCBO offers some margin, repetitive overvoltage events degrade long-term reliability, especially in automotive AEC-Q101 applications.
FMMT495QTA 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
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 10 @ 1A, 10V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT495QTA FAQ
1.How can I place an order for FMMT495QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT495QTA 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 FMMT495QTA reliable?
The price and inventory of FMMT495QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT495QTA is usually 5 days.
3.What payment methods are accepted for FMMT495QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT495QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT495QTA?
FMMT495QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT495QTA 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 FMMT495QTA?
For technical support, including FMMT495QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT495QTA requirements.
6.How does Aetrix verify that FMMT495QTA is sourced from the original manufacturer or authorized distributors?
All FMMT495QTA 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 FMMT495QTA meets industry standards.
7.What is the process for return or replacement of FMMT495QTA?
All FMMT495QTA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT495QTA, 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 FMMT495QTA part is unused and in its original packaging.
Return procedure for FMMT495QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT495QTA Tags
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MMBT3906LT1G
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MMBT3904-7-F
Diodes Incorporated
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MMBT2222A-7-F
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BC847B,215
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