Product Overview
Fairchild SFH9140 P-Channel 166W Power MOSFET
Condition
Unused new old stock (NOS). Leads are straight, clean, and unclipped with no solder residue. Markings legible: Fairchild logo, SFH9140, F22.
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Product Overview
Designed for high-current switching and linear power amplification, the Fairchild SFH9140 is a P-channel enhancement-mode power MOSFET housed in a heavy-duty TO-3P package. With a -100V drain-to-source breakdown rating and 166W dissipation capacity, it handles demanding power supply rails, motor drivers, and high-fidelity complementary audio output stages.
Key Features
- Transistor Polarity: P-channel
- Drain-to-Source Breakdown Voltage (V(BR)DSS): -100 V
- Continuous Drain Current (ID): -19 A at 25°C
- Drain-Source On-State Resistance (RDS(on)): 0.20 ohm maximum
- Total Power Dissipation (PD): 166 W
- Package / Case: TO-3P (3-lead through-hole with metal mounting tab)
- Pin Configuration (facing front): Pin 1 Gate, Pin 2 Drain, Pin 3 Source
- Functional cross-reference: Drop-in substitute for standard IRFP9140
Applications
- Complementary push-pull output stages in vintage and high-power audio amplifiers
- High-side power switching for DC motors, solenoids, and inductive loads
- Power supply regulation and inverter circuits on -100V rails
- Bench power supply prototyping and maker builds requiring high current handling
Frequently Asked Questions
What is the pinout for the SFH9140 in the TO-3P package?
Facing the front printed face with leads pointing downward, Pin 1 (left) is the Gate, Pin 2 (center) is the Drain, and Pin 3 (right) is the Source. The metal mounting tab is electrically connected to Pin 2 (Drain).
Can the SFH9140 replace an IRFP9140?
Yes. The SFH9140 matches the -100V breakdown rating, -19A current rating, 0.20 ohm on-resistance, standard pinout, and TO-3P footprint, making it a direct functional replacement.
Is the metal mounting tab isolated from the electrical pins?
No. The metal mounting tab is internally connected to Pin 2 (Drain). When mounting to a grounded heatsink or common chassis, use an insulating mounting pad and bushing.
P-channel power transistors with real thermal mass are getting harder to track down when an older linear amp goes silent. Bolt this one to the heatsink, bias it up, and bring the channel back to life.
