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Diodes Incorporated FMMT495TA
- Part No.:
- FMMT495TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT495TA.pdf
- Description:
- TRANS NPN 150V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:68,716
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Product details
Overview
FMMT495TA from Diodes Incorporated is a 150V NPN silicon planar medium-power transistor in SOT23 package, rated for 1A continuous collector current, 170V collector-base breakdown voltage, and 500mW power dissipation. It delivers high-current gain (hFE ≥100 at IC = 1mA; ≥50 at IC = 500mA) and is AEC-Q101 qualified for automotive reliability, commonly used in DC-DC converter switching stages and industrial power control circuits.
For engineers reviewing the FMMT495TA datasheet, FMMT495TA pinout, FMMT495TA application, or FMMT495TA equivalent, key selection criteria include VCEO = 150V, IC = 1A, hFE characterization up to 1A, SOA limits under pulsed conditions, and thermal resistance RθJA = 250°C/W on standard FR4 PCBs.
Technical Context
This NPN bipolar junction transistor operates in linear or saturated switching modes with guaranteed BVCEO ≥150V and BVCBO ≥170V, enabling use in high-voltage interface and load-switching applications where robust off-state blocking is required. Its hFE is specified across four current levels (1mA–1A), supporting stable gain behavior in both small-signal amplification and medium-power switching.
VCE(SAT) ≤0.3V at IC = 500mA/IB = 50mA ensures low conduction loss in active-low switch configurations, while fT = 100MHz supports moderate-frequency switching up to several MHz in non-resonant topologies. ESD ratings of 4kV HBM confirm suitability for handling in automated assembly environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 150V - Maximum sustainable collector-emitter voltage before avalanche breakdown in common-emitter configuration |
| IC (cont.) | 1A - Continuous DC collector current rating under TA = +25°C with derating above 25°C per 250°C/W RθJA |
| PD | 500mW - Max steady-state power dissipation on 15×15mm FR4 PCB with 1oz copper; defines thermal design margin |
| hFE @ IC=1A | ≥10 - Minimum DC current gain at full-rated current, critical for base drive sizing in saturation |
| VCE(SAT) | ≤0.3V @ IC=500mA/IB=50mA - Ensures <150mW conduction loss in saturated switch operation |
| fT | 100MHz - Transition frequency indicating usable bandwidth for small-signal amplification or fast switching |
| ESD HBM | 4000V - Human Body Model rating confirming robustness during board-level handling and reflow |
Pinout & Package
SOT23 plastic surface-mount package with matte tin-plated leads, UL 94V-0 flammability rating, and moisture sensitivity level 1. Dimensions conform to JEDEC TO-236AB standard (length 2.9mm, width 1.3mm, height 1.0mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current return path; connected to ground or low-side reference in common-emitter switches |
| 2 (Base) | B | Control input; requires ~50mA drive for full saturation at 500mA collector load |
| 3 (Collector) | C | High-side output node; handles up to 150V potential swing and 1A continuous current |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade temperature cycling (-55°C to +150°C), vibration, and humidity stress |
| High BVCEO (150V) | Enables direct replacement of lower-voltage transistors in 12V/24V/48V industrial power rails without redesign |
| hFE characterized to 1A | Provides verified gain data across full operating range-reduces base drive uncertainty in production designs |
| Green, halogen-free construction | Meets IEC 61249-2-21:2010; Br+Cl <1500ppm, Sb <1000ppm-supports RoHS 2 and automotive ELV compliance |
Applications
| Industrial Power Switching | Automotive Load Control |
|---|---|
Use Scenario: Driving solenoids, relays, and LED arrays in programmable logic controllers and motor starters. IC Role / Device Role / Timing Role: NPN medium-power switch operating in saturation mode with fixed base drive. Use Value: 150V VCEO withstands inductive kickback from 24V/48V coils; 1A rating supports >10W load switching without heatsinking. | Use Scenario: Controlling fuel pump drivers, HVAC blower motors, and window lift modules in passenger vehicles. IC Role / Device Role / Timing Role: High-reliability load switch compliant with AEC-Q101 stress requirements. Use Value: PPAP-capable qualification and 4kV HBM ESD rating ensure first-pass yield in automotive Tier-1 manufacturing lines. |
| DC-DC Converter Topology | Overvoltage Protection Circuit |
Use Scenario: Low-side switch in buck converter primary stage for 12V-to-5V/3.3V point-of-load regulation. IC Role / Device Role / Timing Role: Fast-switching NPN transistor with fT = 100MHz enabling efficient operation up to ~500kHz. Use Value: VCE(SAT) ≤0.3V minimizes conduction loss; SOA curve validated for 100µs–1ms pulses supports PWM duty cycle flexibility. | Use Scenario: Crowbar element in regulated power supplies to clamp output during overvoltage faults. IC Role / Device Role / Timing Role: High-voltage clamping transistor triggered by Zener reference and comparator. Use Value: BVCEO = 150V and BVCBO = 170V provide 20V safety margin above typical 130V rail fault thresholds. |
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 |
|---|---|---|---|
| ZXTN25050CFH | Higher VCEO (50V), lower RθJA (170°C/W), but only 500mA IC rating | Not suitable for 150V blocking or 1A loads; limited to low-voltage, high-efficiency switching | Select only when thermal performance is critical and voltage/current demands are reduced |
| MMBT4401 | Lower VCEO (40V), higher hFE (100–300), same SOT23 package and pinout | Cannot replace FMMT495TA in >40V circuits; acceptable only in 5–12V logic-level switching | Use only as drop-in substitute in legacy low-voltage designs with no voltage headroom requirement |
Compared with ZXTN25050CFH and MMBT4401, FMMT495TA uniquely balances 150V blocking, 1A current, and AEC-Q101 qualification-making it irreplaceable in 24V/48V automotive and industrial switching where both voltage headroom and reliability are mandatory.
Availability
FMMT495TA is available at Aetrix Electronics and suitable for industrial power switching, automotive load control, DC-DC converter topology, and overvoltage protection circuits requiring stable component supply and long-term lifecycle assurance.
Supply support for FMMT495TA 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 North America.
FMMT495TA belongs to Diodes' high-reliability medium-power transistor product line, engineered specifically for automotive and industrial applications demanding extended temperature operation, AEC-Q101 validation, and robust SOA performance.
FAQ
What is the maximum safe operating voltage for FMMT495TA in a common-emitter configuration?
The absolute maximum collector-emitter voltage (VCEO) is 150V under DC conditions at TA = +25°C. Derating is required above 25°C per the RθJA = 250°C/W thermal resistance; at 100°C ambient, VCEO must be reduced to approximately 120V to maintain junction temperature below 150°C.
Can FMMT495TA be used as a direct replacement for MMBT4401 in existing designs?
No-FMMT495TA has significantly higher VCEO (150V vs. 40V) and lower hFE at high current, making it incompatible in low-voltage, high-gain circuits. Substitution requires verification of voltage margin, base drive capability, and SOA compliance under pulse conditions.
Is FMMT495TA suitable for linear amplifier applications?
It is not optimized for linear amplification due to limited hFE stability above 250mA and absence of small-signal parameters like noise figure or output conductance. Its datasheet emphasizes switching and medium-power gain characteristics-not analog linearity.
Does FMMT495TA require a heatsink in standard SOT23 mounting?
No external heatsink is required for ≤500mW continuous dissipation on a 15×15mm FR4 PCB with 1oz copper. However, at full 1A/150V operation, power dissipation exceeds rating-designs must operate within SOA limits using pulse-width control or derated voltage/current.
FMMT495TA 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
FMMT495TA FAQ
1.How can I place an order for FMMT495TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT495TA 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 FMMT495TA reliable?
The price and inventory of FMMT495TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT495TA is usually 5 days.
3.What payment methods are accepted for FMMT495TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT495TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT495TA?
FMMT495TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT495TA 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 FMMT495TA?
For technical support, including FMMT495TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT495TA requirements.
6.How does Aetrix verify that FMMT495TA is sourced from the original manufacturer or authorized distributors?
All FMMT495TA 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 FMMT495TA meets industry standards.
7.What is the process for return or replacement of FMMT495TA?
All FMMT495TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT495TA, 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 FMMT495TA part is unused and in its original packaging.
Return procedure for FMMT495TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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