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Diodes Incorporated FMMT625TA
- Part No.:
- FMMT625TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT625TA.pdf
- Description:
- TRANS NPN 150V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:33,315
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Product details
Overview
FMMT625TA from Diodes Incorporated is a 150V NPN silicon low-saturation transistor in SOT23 package, rated for 1A continuous collector current, 625mW power dissipation, and characterized with hFE up to 450 at IC = 3A. It serves as a high-voltage switching element in DC-DC modules and motor drive stages where robust breakdown voltage and low VCE(SAT) are critical.
For engineers reviewing the FMMT625TA datasheet, FMMT625TA pinout, FMMT625TA application, or FMMT625TA equivalent, key selection criteria include BVCEO ≥ 150V, VCE(SAT) ≤ 300 mV at IC = 1A/IB = 50mA, AEC-Q101 qualification, SOT23 thermal resistance (RθJA = 200°C/W), and ESD HBM ≥ 8 kV.
Technical Context
This NPN transistor is optimized for high-voltage switching with guaranteed BVCEO = 150 V and low saturation voltage - VCE(SAT) = 110 mV at IC = 0.1A/IB = 1mA and 300 mV at IC = 1A/IB = 50mA. Its fT = 135 MHz supports fast switching in power management circuits.
Thermal design is enabled by RθJL = 194°C/W (junction-to-leads) and derating to zero power at +150°C ambient. The device operates across –55°C to +150°C and meets J-STD-020 moisture sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO / VCEO | 150 V - Enables use in 100–125V bus applications with margin against transients |
| IC (continuous) | 1 A - Supports medium-power switching loads without forced cooling |
| PD (TA = 25°C) | 625 mW - Limits usable power in SOT23 without heatsinking or airflow |
| VCE(SAT) @ IC=1A | 300 mV - Reduces conduction loss to <300 mW at full rated current |
| hFE @ IC=1A | 15–45 - Ensures reliable base drive design with 50 mA IB for full saturation |
| fT | 135 MHz - Allows stable operation up to ~10–20 MHz switching frequencies |
| ESD HBM | ≥8,000 V - Permits handling in standard assembly environments without special ESD controls |
Pinout & Package
Package: SOT23 - surface-mount plastic package with 0.008 g mass, UL 94V-0 rating, and matte tin-plated leads solderable per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; lowest impedance path for emitter current |
| 2 (Base) | Control input | Receives current-limited drive (max 500 mA) to switch collector current |
| 3 (Collector) | High-voltage output node | Switches up to 150 V load; thermally coupled to lead for junction-to-lead heat transfer |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD stress |
| Low VCE(SAT) | 110–300 mV range enables <0.3 W conduction loss at 1 A, reducing thermal burden |
| hFE characterization up to 3.0 A | Supports design confidence for peak-current pulses beyond DC rating |
| Halogen- and antimony-free "Green" construction | Meets RoHS 3 (2015/863/EU) with Br+Cl <1500 ppm and Sb <1000 ppm |
Applications
| DC-DC Converter Switching Stage | Motor Driver High-Side Switch |
|---|---|
Use Scenario: Step-down (buck) converter operating from 48–120 V input bus with 1 A output current. IC Role / Device Role / Timing Role: NPN switch controlling energy transfer into output inductor; driven by PWM controller with base resistor network. Use Value: 150 V BVCEO provides headroom against input ripple and switching overshoot; 300 mV VCE(SAT) limits conduction loss to 300 mW at full load. | Use Scenario: 24 V brushed DC motor driver with direction control via H-bridge configuration. IC Role / Device Role / Timing Role: High-side NPN switch enabling bidirectional current flow when paired with complementary low-side devices. Use Value: Low VBE(SAT) (0.85 V typ) and high hFE reduce base drive power; SOT23 footprint supports compact PCB layout. |
| Industrial Power Supply Protection | LED Driver Current Switch |
Use Scenario: Overvoltage crowbar circuit triggered by Zener reference to protect downstream 12 V rail. IC Role / Device Role / Timing Role: Fast-acting shunt switch activated during fault condition to short input to ground. Use Value: 1500 ns t(OFF) ensures rapid shutdown under overvoltage; 8 kV HBM ESD withstand protects against field-induced transients. | Use Scenario: Constant-current LED string driver with analog dimming via base current modulation. IC Role / Device Role / Timing Role: Linear current regulator operating in active region with feedback-controlled base bias. Use Value: hFE stability across 10 mA–1 A enables precise current scaling; 625 mW PD allows 500 mA at 1.25 V drop without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-voltage switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN2012ZTA | Higher VCEO = 200 V; lower VCE(SAT) = 170 mV @ 1A; SOT89 package (higher PD = 2.5 W) | Supports >150 V systems; requires larger footprint and different thermal layout | Select when higher voltage margin or higher continuous power is required |
| FMMT417TA | Lower VCEO = 60 V; same SOT23 package; hFE = 100–300 @ IC = 500 mA | Not suitable for >60 V applications; better for low-voltage logic-level switching | Select only for sub-60 V designs where space and cost constrain package choice |
Compared with ZXTN2012ZTA and FMMT417TA, FMMT625TA uniquely balances 150 V capability, SOT23 compactness, and automotive qualification - making it optimal for space-constrained, high-reliability 48–120 V industrial and automotive power stages.
Availability
FMMT625TA is available at Aetrix Electronics and suitable for DC-DC modules, motor control and drive functions, and industrial power supply protection requiring stable component supply and AEC-Q101 compliance.
Supply support for FMMT625TA 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.
FMMT625TA belongs to Diodes' FMMT series of high-voltage, high-reliability SOT23 transistors designed specifically for automotive and industrial power switching applications demanding AEC-Q101 qualification and low saturation voltage.
FAQ
What is the maximum safe operating voltage for FMMT625TA in continuous DC applications?
The absolute maximum collector-emitter voltage (VCEO) is 150 V, and the datasheet guarantees BVCEO ≥ 150 V at IC = 1 mA. For reliable long-term operation, design should maintain VCE ≤ 120 V to accommodate transients and ensure margin against degradation. Derating is required above 25°C ambient per the published thermal curve.
Can FMMT625TA be used in linear (active-region) applications like constant-current sources?
Yes - its hFE is characterized from 10 mA to 3 A and VBE(ON) is specified at 0.74–1.0 V (IC = 1 A). With 625 mW power dissipation limit, it supports up to ~500 mA at 1.25 V drop (e.g., LED driver), provided junction temperature remains ≤150°C using appropriate PCB copper area and ambient conditions.
Is the SOT23 footprint of FMMT625TA compatible with standard pick-and-place equipment?
Yes - the SOT23 outline conforms to JEDEC MO-178AB, with standardized pad dimensions (e.g., 0.915 mm width, 1.30 mm length) and 0.95 mm pitch. Diodes provides recommended SOT23 pad layouts on its website, and the device's matte tin plating ensures compatibility with standard reflow profiles and no-clean fluxes.
Does FMMT625TA require external base resistors in switching applications?
Yes - base current must be limited to avoid exceeding IB = 500 mA absolute maximum. For 1 A collector current and minimum hFE = 15, ≥33 mA base drive is needed; typical designs use 1–10 kΩ series resistors from a 3.3–5 V logic source. The device does not integrate base resistors and relies on external bias network for saturation control.
FMMT625TA 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, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 200mA, 10V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 135MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT625TA FAQ
1.How can I place an order for FMMT625TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT625TA 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 FMMT625TA reliable?
The price and inventory of FMMT625TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT625TA is usually 5 days.
3.What payment methods are accepted for FMMT625TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT625TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT625TA?
FMMT625TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT625TA 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 FMMT625TA?
For technical support, including FMMT625TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT625TA requirements.
6.How does Aetrix verify that FMMT625TA is sourced from the original manufacturer or authorized distributors?
All FMMT625TA 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 FMMT625TA meets industry standards.
7.What is the process for return or replacement of FMMT625TA?
All FMMT625TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT625TA, 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 FMMT625TA part is unused and in its original packaging.
Return procedure for FMMT625TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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