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Diodes Incorporated FMMT620TC
- Part No.:
- FMMT620TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT620TC.pdf
- Description:
- TRANS NPN 80V 1.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,308
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Product details
Overview
FMMT620TC from Diodes Incorporated is an 80V NPN silicon low-saturation transistor in SOT23 package, designed for high-current switching with VCE(sat) = 145 mV at IC = 1 A / IB = 20 mA, hFE = 90–170 at 1 A, and 625 mW power dissipation. It serves as a robust, AEC-Q101-qualified switch in DC-DC modules and motor drive stages where low conduction loss and thermal stability are critical.
For engineers reviewing the FMMT620TC datasheet, FMMT620TC pinout, FMMT620TC application, or FMMT620TC equivalent, key selection criteria include verified VCE(sat) performance at 1.5 A, hFE hold-up to 5 A, RθJA = 200 °C/W on FR4, and SOT23 lead-free terminal finish compliant with J-STD-020 Level 1 moisture sensitivity.
Technical Context
This NPN transistor operates in linear or saturated switching mode with BVCEO = 80 V and BVCBO = 100 V, enabling use in 48 V bus and automotive load-switching applications. Its fT = 100–160 MHz supports fast turn-on (ton = 86 ns) and controlled turn-off (toff = 1128 ns) under pulsed conditions (≤300 µs, ≤2% duty).
Thermal design is anchored by RθJL = 194 °C/W (junction-to-leads) and derated power dissipation down to zero at +150 °C ambient. The device maintains hFE ≥ 30 at IC = 5 A, supporting high-gain current amplification in power management feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 80 V - Supports operation in 48 V systems with 67 % safety margin against transients |
| IC (continuous) | 1.5 A - Enables direct drive of small motors or solenoids without external buffering |
| VCE(sat) | 145 mV @ IC=1 A, IB=20 mA - Delivers <90 mΩ effective on-resistance for minimal conduction loss |
| hFE | 90–170 @ IC=1 A - Ensures stable base drive sizing across production lots and temperature range |
| fT | 100–160 MHz @ IC=50 mA - Allows use in high-frequency PWM control up to ~10 MHz switching |
| RθJA | 200 °C/W - Requires ≥25 mm × 25 mm single-sided 1 oz copper pad for full 625 mW rating |
Pinout & Package
Package: SOT23 - Surface-mount plastic case, 0.008 g weight, UL 94V-0 rated, matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink node | Low-impedance return path; connected to ground or low-side reference in switching topologies |
| 2 (Base) | Control input | Accepts TTL/CMOS-compatible drive; requires 20 mA for full saturation at 1 A collector current |
| 3 (Collector) | High-side switched output | Carries load current; thermally coupled to PCB via lead; connects to VCC or inductive load |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive power electronics with PPAP capability and -55 °C to +150 °C operating range |
| Low VCE(sat) at high current | 145 mV @ 1 A enables <150 mW conduction loss-critical for thermally constrained DC-DC modules |
| High hFE retention | hFE ≥ 30 @ IC = 5 A ensures reliable overcurrent handling without base drive redesign |
| Green compound & RoHS compliance | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental mandates |
Applications
| DC-DC Converter Switch | Automotive Motor Driver |
|---|---|
Use Scenario: High-efficiency buck converter in infotainment power supply with 12 V input and 3.3 V/1 A output. IC Role / Device Role / Timing Role: Low-side synchronous rectifier switch replacing Schottky diode to reduce conduction loss. Use Value: VCE(sat) = 145 mV cuts rectifier loss by >60 % vs. 0.4 V diode drop, improving efficiency by ~2.1 % at full load. |
Use Scenario: Window lift motor driver in Class A vehicle interior module with PWM-controlled direction reversal. IC Role / Device Role / Timing Role: High-current NPN switch controlling motor H-bridge low-side leg. Use Value: 1.5 A continuous rating and AEC-Q101 qualification ensure reliability over 100,000 actuation cycles at 85 °C ambient. |
| CCFL Backlight Inverter | Industrial Power Sequencer |
Use Scenario: Resonant inverter stage driving cold cathode fluorescent lamp in medical display backlight. IC Role / Device Role / Timing Role: Fast-switching transistor in Royer oscillator topology generating 600 V AC at 50 kHz. Use Value: ton/toff = 86/1128 ns and fT > 100 MHz support clean square-wave drive with <5 % dead-time distortion. |
Use Scenario: Controlled power-up sequencing for FPGA and analog subsystems in industrial PLC backplane. IC Role / Device Role / Timing Role: Precision timing switch enabling staggered 3.3 V → 1.2 V rail enable with 10 ms delay. Use Value: Stable hFE across -40 °C to +85 °C ensures ±3 % timing accuracy without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25040DFH | VCEO = 40 V, IC = 3 A, VCE(sat) = 110 mV @ 2 A - lower voltage rating but higher current and lower saturation | Not suitable for 48 V bus applications; limited to ≤36 V systems | Select only when system voltage ≤36 V and peak current >2 A is required |
| MMBT6427LT1G | VCEO = 80 V, IC = 1 A, VCE(sat) = 200 mV @ 500 mA - same voltage rating but lower current and higher saturation | Insufficient for 1.5 A continuous loads; thermal limit reached earlier | Acceptable only for intermittent 500 mA loads with relaxed efficiency targets |
Compared with ZXTN25040DFH and MMBT6427LT1G, FMMT620TC uniquely balances 80 V breakdown, 1.5 A continuous rating, and sub-150 mV saturation-making it optimal for 48 V automotive and industrial switching where voltage margin and thermal headroom are both critical.
Availability
FMMT620TC is available at Aetrix Electronics and suitable for DC-DC modules, automotive motor control, and CCFL backlight inverters requiring stable component supply, AEC-Q101 traceability, and RoHS-compliant sourcing.
Supply support for FMMT620TC 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, specializing in high-reliability power management, signal integrity, and protection solutions.
FMMT620TC belongs to Diodes' low-saturation NPN transistor product line, engineered specifically for high-efficiency switching in space-constrained automotive and industrial power systems.
FAQ
What is the maximum safe operating junction temperature for FMMT620TC?
The absolute maximum junction temperature is +150 °C, with continuous operation permitted from –55 °C to +150 °C. Derating begins at +25 °C ambient, reducing maximum power linearly to zero at +150 °C. Thermal design must account for RθJA = 200 °C/W on standard FR4, requiring adequate copper area for heat spreading.
Is FMMT620TC pin-compatible with other SOT23 NPN transistors like MMBT2222A?
No-FMMT620TC uses emitter-base-collector (E-B-C) pinout (pin 1 = emitter), whereas MMBT2222A uses emitter-collector-base (E-C-B). Swapping them causes immediate circuit failure. Always verify pin assignment using the top-view diagram: "620" marking aligns with collector (pin 3), and flat edge denotes pin 1 (emitter).
Does FMMT620TC support pulse currents beyond its 1.5 A continuous rating?
Yes-peak pulse current ICM is rated at 5 A for pulses ≤300 µs with ≤2 % duty cycle. This enables short-duration surge handling in motor startup or inductive load switching. However, VCE(sat) and hFE values at 5 A are specified only under pulsed test conditions and must not be assumed for DC operation.
How does the AEC-Q101 qualification impact FMMT620TC's use in non-automotive applications?
AEC-Q101 qualification confirms extended temperature cycling, mechanical shock, and humidity resistance-benefiting any high-reliability application. Industrial control, medical power supplies, and outdoor telecom equipment gain improved field lifetime and reduced infant mortality, even without automotive end-use requirements.
FMMT620TC 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:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 200mV @ 50mA, 1.5A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 200mA, 2V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 160MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT620TC FAQ
1.How can I place an order for FMMT620TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT620TC 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 FMMT620TC reliable?
The price and inventory of FMMT620TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT620TC is usually 5 days.
3.What payment methods are accepted for FMMT620TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT620TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT620TC?
FMMT620TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT620TC 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 FMMT620TC?
For technical support, including FMMT620TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT620TC requirements.
6.How does Aetrix verify that FMMT620TC is sourced from the original manufacturer or authorized distributors?
All FMMT620TC 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 FMMT620TC meets industry standards.
7.What is the process for return or replacement of FMMT620TC?
All FMMT620TC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT620TC, 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 FMMT620TC part is unused and in its original packaging.
Return procedure for FMMT620TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT620TC Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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