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Diodes Incorporated FMMT495TC
- Part No.:
- FMMT495TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT495TC.pdf
- Description:
- TRANS NPN 150V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:28,108
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Product details
Overview
FMMT495TC 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 = 1A) and is AEC-Q101 qualified for automotive reliability, commonly used in DC-DC converter switching stages and industrial load switching circuits.
For engineers reviewing the FMMT495TC datasheet, FMMT495TC pinout, FMMT495TC application, or FMMT495TC equivalent, key selection criteria include breakdown voltage margin (150V VCEO), thermal resistance (RθJA = 250°C/W), pulse current capability (2A ICM), and AEC-Q101 qualification status for mission-critical embedded control.
Technical Context
This NPN bipolar junction transistor operates in linear or saturated switching modes with verified VCE(SAT) ≤ 0.3V at IC = 500mA/ IB = 50mA and fT = 100MHz at VCE = 10V/IC = 50mA. Its safe operating area (SOA) is characterized up to 150V and 1A under DC and pulsed conditions on 15mm × 15mm FR4 PCB.
The device features low leakage (ICES ≤ 100nA at VCE = 150V), robust ESD protection (4kV HBM), and stable hFE performance across IC = 1mA–1A, enabling predictable gain in high-voltage amplifier and switch driver designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 150V - supports operation in 100V-class DC bus applications with 50% safety margin |
| IC (continuous) | 1A - enables direct drive of medium-power solenoids, relays, or LED strings |
| PD | 500mW - requires thermal derating above +70°C ambient on standard FR4 PCB |
| hFE | 10–300 - provides stable current amplification across 1mA–500mA collector range |
| VCE(SAT) | ≤ 0.3V @ IC=500mA - minimizes conduction loss in switching regulators |
| fT | 100MHz - suitable for audio-frequency amplification and <1MHz switching |
| RθJA | 250°C/W - defines maximum power handling on 15×15mm 1oz copper FR4 board |
Pinout & Package
Package: SOT23 - surface-mount plastic package with 0.008g mass, UL 94V-0 flammability rating, and moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; must handle full load current |
| 2 (Base) | Control input | Drives with 50mA peak to saturate at 500mA collector current |
| 3 (Collector) | Current source terminal | Connected to positive rail or inductive load; withstands 150V transient |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade temperature cycling (-55°C to +150°C) and reliability stress testing |
| High VCEO margin | 150V rating exceeds typical 48V/60V industrial bus requirements by >2× |
| Lead-free & halogen-free | Meets RoHS 2 and JEDEC green standards (<900ppm Br/Cl, <1000ppm Sb) |
| Low VCE(SAT) | 0.2V typical at IC=250mA ensures <50mW conduction loss per switch event |
Applications
| Industrial Power Switching | Automotive Load Control |
|---|---|
Use Scenario: Driving 24V solenoid valves in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: Medium-power NPN switch controlling inductive loads with flyback diode integration. Use Value: 150V VCEO absorbs 100V+ inductive kickback; 1A IC supports 500mA nominal valve hold current. | Use Scenario: Controlling HVAC blower motor speed via PWM-driven relay coil in passenger vehicle climate systems. IC Role / Device Role / Timing Role: High-reliability switching element interfacing microcontroller GPIO to relay primary winding. Use Value: AEC-Q101 qualification ensures operation over full automotive temperature range; 2A ICM handles relay turn-on surge. |
| DC-DC Converter Driver | LED String Current Regulation |
Use Scenario: Low-side switch in non-isolated buck converter feedback loop for 12V→5V conversion in industrial sensors. IC Role / Device Role / Timing Role: Fast-switching NPN transistor in synchronous rectifier or gate driver stage. Use Value: 100MHz fT supports clean switching at 500kHz; low RθJA enables stable thermal behavior at 1W dissipation. | Use Scenario: Constant-current switch for 350mA white LED arrays in emergency lighting fixtures. IC Role / Device Role / Timing Role: Linear or PWM-controlled current sink regulating LED string brightness. Use Value: Stable hFE ≥ 50 at 350mA ensures precise current mirroring; 500mW PD accommodates 1.2V drop at full current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN2012ZTA | VCEO = 100V, IC = 1.5A, SOT23 package, hFE = 100–300 @ IC = 500mA | Lacks 150V breakdown margin; unsuitable for >100V bus transients | Select when 100V rating suffices and higher IC is prioritized over voltage headroom |
| MMBT4401 | VCEO = 40V, IC = 600mA, SOT23, hFE = 100–300 @ IC = 150mA | Lower voltage/current ratings limit use to sub-24V logic-level switching only | Choose for cost-sensitive low-voltage digital interface where 150V capability is unnecessary |
Compared with ZXTN2012ZTA and MMBT4401, FMMT495TC uniquely balances 150V breakdown, 1A current, and AEC-Q101 compliance-making it the only option among the three qualified for automotive 48V+ systems requiring transient immunity and extended temperature operation.
Availability
FMMT495TC is available at Aetrix Electronics and suitable for industrial power switching, automotive load control, and DC-DC converter driver applications requiring stable component supply, AEC-Q101 qualification, and consistent SOT23 packaging.
Supply support for FMMT495TC 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 and manufacturing operations across Asia and the Americas.
FMMT495TC belongs to Diodes' high-voltage NPN transistor product line, engineered specifically for reliable switching in automotive and industrial environments where voltage margin, thermal stability, and qualification rigor are critical.
FAQ
What is the maximum safe operating voltage for FMMT495TC in continuous DC applications?
The FMMT495TC is rated for 150V collector-emitter voltage (VCEO) under DC conditions at TA = +25°C. Operation above 120V is permitted only with appropriate derating per the SOA curve, and transient spikes must remain within the 150V limit to avoid avalanche failure.
Can FMMT495TC replace a BC817 in a 24V relay driver circuit?
Yes-FMMT495TC offers superior voltage rating (150V vs. 45V), higher current (1A vs. 500mA), and AEC-Q101 qualification. Its VCE(SAT) is comparable (≤0.3V), and SOT23 pinout matches BC817, enabling direct substitution where enhanced ruggedness is needed.
Is thermal pad layout required for FMMT495TC on FR4 PCB?
No dedicated thermal pad is specified. The device relies on standard SOT23 copper pour (15mm × 15mm, 1oz) for heat dissipation. RθJA = 250°C/W assumes this layout; reducing copper area increases junction temperature proportionally and requires power derating.
Does FMMT495TC support PWM switching at 20kHz for LED dimming?
Yes-its 100MHz transition frequency (fT) and fast saturation characteristics (VBE(SAT) ≤ 1.0V, VCE(SAT) ≤ 0.3V) ensure minimal switching losses at 20kHz. Thermal limits (500mW) constrain average current to ~350mA at full duty cycle on standard PCB.
FMMT495TC 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT495TC FAQ
1.How can I place an order for FMMT495TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT495TC 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 FMMT495TC reliable?
The price and inventory of FMMT495TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT495TC is usually 5 days.
3.What payment methods are accepted for FMMT495TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT495TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT495TC?
FMMT495TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT495TC 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 FMMT495TC?
For technical support, including FMMT495TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT495TC requirements.
6.How does Aetrix verify that FMMT495TC is sourced from the original manufacturer or authorized distributors?
All FMMT495TC 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 FMMT495TC meets industry standards.
7.What is the process for return or replacement of FMMT495TC?
All FMMT495TC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT495TC, 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 FMMT495TC part is unused and in its original packaging.
Return procedure for FMMT495TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT495TC Tags
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