Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Vishay Siliconix IRFU120

Name: IRFU120
Brand: Vishay Siliconix
SKU: IRFU120
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IRFU120

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: IRFU120.pdf

Description:: MOSFET N-CH 100V 7.7A TO251AA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,261

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

IRFU120 from Vishay Siliconix is a 100 V, 7.7 A N-channel power MOSFET in straight-lead IPAK (TO-251) package, optimized for through-hole mounting in DC-DC converters, motor control, and power supply switching stages with R_DS(on) = 0.27 Ω at V_GS = 10 V and Q_g = 16 nC.

For engineers reviewing the IRFU120 datasheet, IRFU120 pinout, IRFU120 application, or IRFU120 equivalent, this page delivers verified electrical specs, thermal derating behavior, avalanche capability (E_AS = 210 mJ), body diode recovery (t_rr = 130–260 ns), and PCB-mount power dissipation (2.5 W).

Technical Context

This third-generation TrenchFET® MOSFET uses silicon process optimization to achieve low conduction loss and fast switching with controlled dV/dt (5.5 V/ns). Its gate threshold voltage (2.0–4.0 V) supports standard 10 V gate drive while maintaining robust noise immunity.

The device integrates a monolithic body diode rated for 7.7 A continuous source-drain current and 31 A pulsed operation, with reverse recovery charge Q_rr = 0.65–1.3 μC - enabling reliable operation in hard-switched inductive loads without external snubbers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	100 V - supports 48 V bus systems with 2× safety margin against transients
R_DS(on)	0.27 Ω @ V_GS = 10 V - enables <1.5 W conduction loss at 7.7 A DC
Q_g	16 nC - determines gate drive power requirement and switching speed in PWM circuits
E_AS	210 mJ - allows unclamped inductive switching without external protection in flyback or motor phases
t_rr	130–260 ns - defines minimum dead time needed to prevent shoot-through in half-bridge topologies
P_D (PCB mount)	2.5 W @ T_A = 25 °C - sets practical thermal limit for FR-4 PCB designs without heatsink
R_thJA (PCB)	50 °C/W - quantifies thermal resistance from junction to ambient on 1"² FR-4 board

Pinout & Package

IRFU120 uses the IPAK (TO-251AA) straight-lead package with three terminals: Gate (G), Drain (D), and Source (S), designed for through-hole mounting on standard PCBs. The drain-connected tab provides mechanical anchoring and thermal path to copper pour.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate control input	Receives 10 V logic-level drive; requires ≤16 nC charge for full enhancement
D	Drain connection	High-side switch node; connected to internal die backside and exposed metal tab
S	Source return path	Common reference for gate drive and load current; ties to ground or low-side switch

Key Features

Feature	Design Value
Repetitive avalanche rated	Supports 7.7 A repetitive I_AR and 4.2 mJ E_AR, enabling rugged operation in inductive fault conditions
Dynamic dV/dt rating	5.5 V/ns - prevents false turn-on during high-speed voltage transients in bridge configurations
Fast switching	td(on) = 6.8 ns, tr = 27 ns, td(off) = 18 ns - reduces switching losses in 100–500 kHz SMPS designs
Body diode with low Q_rr	Q_rr = 0.65–1.3 μC - minimizes reverse recovery loss and EMI in freewheeling paths
Through-hole IPAK package	TO-251AA outline with straight leads - ensures mechanical reliability and thermal transfer in industrial PCB assemblies

Applications

DC-DC Converter Primary Switch	Brushed DC Motor Driver
Use Scenario: High-efficiency 24–48 V input buck converter delivering up to 15 A output. IC Role / Device Role / Timing Role: Main high-side switching element operating at 250 kHz with synchronous rectification. Use Value: Low R_DS(on) and fast switching reduce conduction and transition losses; avalanche rating absorbs leakage inductance spikes.	Use Scenario: H-bridge driver for 12–36 V brushed motors in industrial actuators. IC Role / Device Role / Timing Role: Low-side switch controlling motor direction and PWM speed regulation. Use Value: Robust body diode handles reverse EMF during PWM off-time; 31 A pulsed current supports stall conditions.
AC-DC Adapter Secondary Side	LED Driver Constant-Current Switch
Use Scenario: Secondary-side synchronous rectifier in 65 W offline flyback adapter. IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode to improve efficiency above 85%. Use Value: Low V_SD (2.5 V) and fast t_rr minimize forward and recovery losses at light-to-full load.	Use Scenario: Constant-current switch in isolated LED driver for street lighting. IC Role / Device Role / Timing Role: Primary-side switching transistor regulating LED string current via transformer feedback. Use Value: Repetitive avalanche capability withstands transformer reset energy; 100 V rating covers reflected voltage peaks.

DC-DC Converter Primary Switch

Brushed DC Motor Driver

Use Scenario: High-efficiency 24–48 V input buck converter delivering up to 15 A output.

IC Role / Device Role / Timing Role: Main high-side switching element operating at 250 kHz with synchronous rectification.

Use Value: Low R_DS(on) and fast switching reduce conduction and transition losses; avalanche rating absorbs leakage inductance spikes.

Use Scenario: H-bridge driver for 12–36 V brushed motors in industrial actuators.

IC Role / Device Role / Timing Role: Low-side switch controlling motor direction and PWM speed regulation.

Use Value: Robust body diode handles reverse EMF during PWM off-time; 31 A pulsed current supports stall conditions.

AC-DC Adapter Secondary Side

LED Driver Constant-Current Switch

Use Scenario: Secondary-side synchronous rectifier in 65 W offline flyback adapter.

IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode to improve efficiency above 85%.

Use Value: Low V_SD (2.5 V) and fast t_rr minimize forward and recovery losses at light-to-full load.

Use Scenario: Constant-current switch in isolated LED driver for street lighting.

IC Role / Device Role / Timing Role: Primary-side switching transistor regulating LED string current via transformer feedback.

Use Value: Repetitive avalanche capability withstands transformer reset energy; 100 V rating covers reflected voltage peaks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRFR120	Same die, DPAK (TO-252) surface-mount package; R_thJC = 3.0 °C/W vs. IRFU120's 3.0 °C/W, but R_thJA = 110 °C/W (vs. 50 °C/W for IRFU120 on PCB)	Requires reflow-compatible layout; unsuitable for through-hole assembly or manual repair	Select IRFR120 only when automated SMT production and thermal pad routing are available.
SiHFU120	Identical specifications and IPAK package; Pb-free/halogen-free construction per JEDEC J-STD-609A Class 2a	No functional difference; meets RoHS/REACH requirements where lead-free compliance is mandatory	Choose SiHFU120 for new designs requiring environmental compliance without performance trade-off.

Compared with IRFU120, IRFR120 offers identical electrical performance but demands surface-mount infrastructure and yields higher junction-to-ambient thermal resistance in typical layouts, while SiHFU120 delivers identical functionality with certified lead-free materials - making it the drop-in replacement for regulated markets without design change.

Availability

IRFU120 is available at Aetrix Electronics and suitable for DC-DC converters, motor drivers, and LED lighting systems requiring stable component supply across industrial temperature ranges (−55 °C to +150 °C) and long-lifecycle production programs.

Supply support for IRFU120 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

Vishay Siliconix is a global leader in discrete semiconductors, specializing in power MOSFETs, diodes, and optoelectronics with emphasis on ruggedness, efficiency, and reliability.

The IRFU120 belongs to Vishay's third-generation TrenchFET® power MOSFET family, engineered for high-voltage switching in industrial power supplies, motor controls, and automotive auxiliary systems where avalanche tolerance and thermal stability are critical.

FAQ

What is the maximum continuous drain current for IRFU120 at 100 °C case temperature?

The IRFU120 supports 4.9 A continuous drain current at T_C = 100 °C, derived from its linear derating factor of 0.33 W/°C and 42 W maximum power dissipation at 25 °C. This value reflects thermal limits under sustained conduction, not transient pulse capability.

Does IRFU120 have a built-in body diode, and what are its key parameters?

Yes, IRFU120 integrates a monolithic body diode rated for 7.7 A continuous source-drain current and 31 A pulsed operation. Key parameters include V_SD = 2.5 V at 7.7 A and reverse recovery time t_rr = 130–260 ns, with Q_rr = 0.65–1.3 μC - essential for freewheeling and synchronous rectification.

What is the gate threshold voltage range for IRFU120, and how does it affect drive compatibility?

The IRFU120 has a gate threshold voltage V_GS(th) of 2.0–4.0 V at I_D = 250 μA. This range ensures compatibility with standard 5 V and 10 V logic-level gate drivers while providing sufficient margin against noise-induced turn-on in noisy industrial environments.

Can IRFU120 be used in avalanche mode, and what are the safe operating limits?

Yes, IRFU120 is repetitively avalanche-rated with I_AR = 7.7 A and E_AR = 4.2 mJ per pulse, and single-pulse E_AS = 210 mJ. Safe operation requires limiting pulse width per Fig. 11, maintaining T_J ≤ 150 °C, and using appropriate gate drive to avoid secondary breakdown.

What is the thermal resistance from junction to ambient for IRFU120 when mounted on a standard PCB?

When mounted on a 1" square FR-4 PCB, IRFU120 exhibits R_thJA = 50 °C/W. This value assumes no external heatsink and defines the thermal bottleneck for natural-convection cooling in compact power modules and adapters.

IRFU120 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 100 V

Current - Continuous Drain (Id) @ 25°C:: 7.7A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 270mOhm @ 4.6A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 16 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 360 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 2.5W (Ta), 42W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-251AA

IRFU120 FAQ

1.How can I place an order for IRFU120 through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFU120 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 IRFU120 reliable?

The price and inventory of IRFU120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFU120 is usually 5 days.

3.What payment methods are accepted for IRFU120?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFU120 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFU120?

IRFU120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFU120 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 IRFU120?

For technical support, including IRFU120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFU120 requirements.

6.How does Aetrix verify that IRFU120 is sourced from the original manufacturer or authorized distributors?

All IRFU120 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 IRFU120 meets industry standards.

7.What is the process for return or replacement of IRFU120?

All IRFU120 units undergo pre-shipment inspection (PSI). If there is an issue with IRFU120, 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 IRFU120 part is unused and in its original packaging.

Return procedure for IRFU120:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …