The Diodes Incorporated FMMT458TA is a 400V NPN high-voltage bipolar transistor housed in a compact SOT-23 surface-mount package. It supports 225mA continuous collector current and up to 1A peak pulse current, making it suitable for high-voltage switching and signal-control applications requiring a small PCB footprint.
The device provides strong DC current gain, with hFE of at least 100 at IC = 1mA and 50mA, and at least 15 at IC = 100mA, all under the specified 10V collector-emitter test condition. Transition frequency is specified at 50MHz minimum.
Maximum collector-emitter saturation voltage is 200mV at IC = 20mA and IB = 2mA, and 500mV at IC = 50mA and IB = 6mA. Maximum output capacitance is 5pF, while maximum base-emitter turn-on and saturation voltages are 0.9V.
Maximum power dissipation is 500mW, with an operating and storage temperature range of -55°C to +150°C and a 4kV HBM ESD rating. The exact FMMT458TA version is supplied in SOT-23 on a 7-inch tape-and-reel with 3,000 devices per reel, and carries MSL Level 1, lead-free, RoHS-compliant, halogen-free, and antimony-free specifications.
Diodes Incorporated’s current product page also records an End-of-Life implementation dated August 17, 2022 for the FMMT458 family. For new designs or long-term production, availability and replacement options should therefore be checked before selection.
Key Features:
- Manufacturer: Diodes Incorporated
- Part Number: FMMT458TA
- Device Type: High-Voltage BJT
- Polarity: NPN
- Collector-Base Voltage: 400V
- Collector-Emitter Voltage: 400V
- Emitter-Base Voltage: 7V
- Continuous Collector Current: 225mA
- Peak Pulse Current: 1A
- Maximum Base Current: 200mA
- hFE: ≥100 at 1mA
- hFE: ≥100 at 50mA
- hFE: ≥15 at 100mA
- Maximum VCE(sat): 200mV at 20mA
- Maximum VCE(sat): 500mV at 50mA
- Transition Frequency: ≥50MHz
- Maximum Output Capacitance: 5pF
- Maximum Power Dissipation: 500mW
- RθJA: 250°C/W
- HBM ESD Rating: 4kV
- Operating / Storage Temperature: -55°C to +150°C
- Package: SOT-23
- MSL: Level 1
- Packaging: Tape & Reel
- Reel Quantity: 3,000 pcs
- Lead-Free / RoHS Compliant
- Halogen and Antimony Free
- Lifecycle Status: EOL.
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