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Diodes Incorporated FMMT493TC
- Part No.:
- FMMT493TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT493TC.pdf
- Description:
- TRANS NPN 100V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,198
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Product details
Overview
FMMT493TC from Diodes Incorporated is a 100V NPN medium-power transistor in SOT23 package, rated for 1A continuous collector current and 500mW power dissipation, with guaranteed hFE ≥100 at IC = 1mA and ≥60 at IC = 1A; used in automotive power switching, industrial relay drivers, and DC-DC converter bias circuits.
For engineers reviewing the FMMT493TC datasheet, FMMT493TC pinout, FMMT493TC application, or FMMT493TC equivalent, key selection criteria include VCEO = 100V, IC = 1A, hFE characterization up to 2A, SOT23 thermal resistance (RθJA = 250°C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This NPN bipolar junction transistor supports high-voltage switching with BVCEO = 100V and BVCBO = 120V, enabling operation in 48V industrial bus and 12V/24V automotive systems. Its fT = 150MHz ensures stable gain in low-noise preamplifier and pulse-width modulation stages.
The device delivers VCE(sat) ≤ 600mV at IC = 1A/IB = 100mA and VBE(sat) ≤ 1.15V under same conditions, minimizing conduction loss in high-duty-cycle switching. ESD robustness (HBM = 4kV) and moisture sensitivity level 1 support automated assembly on FR4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100V - supports 48V rail switching with 2× safety margin |
| IC (continuous) | 1A - drives solenoids, small relays, and LED arrays directly |
| PD | 500mW - requires minimal heatsinking on 15mm × 15mm 1oz copper |
| hFE | 60–300 - maintains gain stability across 1mA–1A operating range |
| fT | 150MHz - enables use in RF front-end biasing and fast-switching PWM |
| RθJA | 250°C/W - defines thermal derating slope: 2mW/°C above +25°C ambient |
| ESD HBM | 4000V - withstands handling without external protection diodes |
Pinout & Package
Package: SOT23 (Type DN), surface-mount plastic case with matte tin-plated leads; UL 94V-0 rated, 0.008g weight, JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; lowest impedance path for IC |
| 2 (Base) | Control input | Receives current-limited drive (IB ≤ 200mA); requires series resistor for TTL/CMOS logic interfacing |
| 3 (Collector) | High-side switched output | Connects to load and supply rail; handles full VCEO stress during off-state |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power modules, engine control units, and body electronics per IATF 16949 manufacturing |
| hFE characterized up to 2A | Ensures predictable current gain in peak-load conditions (e.g., relay pull-in, motor startup) |
| Lead-free & halogen-free | Complies with RoHS 3 (2015/863/EU) and "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
| SOT23 thermal performance | RθJL = 197°C/W enables localized heat transfer to PCB copper pour, improving transient power handling |
Applications
| Automotive Lighting Control | Industrial Relay Driver |
|---|---|
Use Scenario: Switching 12V/24V LED headlamp modules in vehicle body control units. IC Role / Device Role / Timing Role: NPN switch controlling high-side load via grounded emitter configuration. Use Value: VCEO = 100V accommodates load-dump transients; hFE ≥60 at 1A ensures reliable turn-on with microcontroller GPIO drive. | Use Scenario: Driving 5V/12V electromagnetic relays in PLC I/O modules. IC Role / Device Role / Timing Role: Medium-power interface transistor amplifying logic-level signals to relay coil current. Use Value: IC = 1A and VCE(sat) ≤ 600mV minimize self-heating during sustained coil energization. |
| DC-DC Converter Bias Circuit | Overvoltage Protection Clamp |
Use Scenario: Providing base current to main power switch in isolated flyback auxiliary supplies. IC Role / Device Role / Timing Role: Current source for gate/base drive of primary-side MOSFET or BJT. Use Value: fT = 150MHz supports stable bias delivery across 100kHz–500kHz switching frequencies. | Use Scenario: Clamping transient overvoltage on 48V industrial bus lines using active Zener-like configuration. IC Role / Device Role / Timing Role: Voltage-controlled shunt element activated by zener-referenced base bias. Use Value: BVCEO = 100V and IC = 1A allow safe clamping of 60–80V spikes without secondary crowbar devices. |
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 |
|---|---|---|---|
| ZXTN25012E6TA | VCEO = 100V, IC = 1.5A, SOT23-6 package, higher hFE (min 100 @ 1A) | Requires PCB layout change due to 6-pin footprint and different pinout | Preferred when higher current headroom and tighter hFE tolerance are required |
| MMBT4401 | VCEO = 40V, IC = 600mA, non-AEC-Q101, lower voltage rating | Not suitable for 48V+ systems or automotive environments | Acceptable only in cost-sensitive, low-voltage consumer applications |
Compared with ZXTN25012E6TA and MMBT4401, FMMT493TC uniquely balances AEC-Q101 compliance, 100V capability, and SOT23-3 compatibility-making it optimal for space-constrained automotive and industrial switching where voltage margin and qualification are mandatory.
Availability
FMMT493TC is available at Aetrix Electronics and suitable for automotive lighting control, industrial relay driving, and DC-DC auxiliary bias circuits requiring stable component supply and long-term lifecycle assurance.
Supply support for FMMT493TC 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.
The FMMT493TC belongs to Diodes' high-reliability medium-power transistor product line, engineered specifically for automotive and industrial switching applications demanding AEC-Q101 qualification, high-voltage tolerance, and robust thermal performance in compact SOT23 packages.
FAQ
What is the maximum allowable base current for continuous operation?
The absolute maximum base current (IB) is 200mA per datasheet Absolute Maximum Ratings. For reliable continuous operation, IB should be limited to ≤100mA to maintain junction temperature within safe limits, especially when IC approaches 1A. Derating is required above +25°C ambient per the RθJA = 250°C/W thermal curve.
Is FMMT493TC compatible with lead-free reflow soldering profiles?
Yes. FMMT493TC uses matte tin-plated leads compliant with IPC/JEDEC J-STD-020 moisture sensitivity level 1 and supports standard lead-free reflow profiles (peak temperature ≤ 260°C, time above liquidus ≤ 60 seconds). The package meets JEDEC J-STD-020 requirements for MSL Level 1 handling.
How does its hFE behavior differ between IC = 1mA and IC = 1A?
hFE is specified as min 300 at IC = 1mA/VCE = 10V and min 60 at IC = 1A/VCE = 10V. This reflects typical BJT current-gain compression at high collector currents due to base widening and high-level injection effects-critical for designing stable bias networks in high-current switching stages.
Can FMMT493TC replace FMMT593 in complementary pair designs?
No. FMMT493TC is NPN; FMMT593 is its complementary PNP counterpart. They share identical voltage/current ratings and SOT23 package but opposite polarity. Direct substitution would invert logic and cause circuit failure. Use only as matched pair in push-pull or H-bridge configurations per design intent.
FMMT493TC 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):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 250mA, 10V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT493TC FAQ
1.How can I place an order for FMMT493TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT493TC 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 FMMT493TC reliable?
The price and inventory of FMMT493TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT493TC is usually 5 days.
3.What payment methods are accepted for FMMT493TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT493TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT493TC?
FMMT493TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT493TC 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 FMMT493TC?
For technical support, including FMMT493TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT493TC requirements.
6.How does Aetrix verify that FMMT493TC is sourced from the original manufacturer or authorized distributors?
All FMMT493TC 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 FMMT493TC meets industry standards.
7.What is the process for return or replacement of FMMT493TC?
All FMMT493TC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT493TC, 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 FMMT493TC part is unused and in its original packaging.
Return procedure for FMMT493TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT493TC Tags
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