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

Vishay Siliconix IRFI9Z24G

Name: IRFI9Z24G
Brand: Vishay Siliconix
SKU: IRFI9Z24G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRFI9Z24G

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack, Isolated Tab

Datasheet:: IRFI9Z24G.pdf

Description:: MOSFET P-CH 60V 8.5A TO220-3

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Product details

Overview

IRFI9Z24G from Vishay Siliconix is a P-channel enhancement-mode power MOSFET in TO-220 FULLPAK package, rated for -60 V V_DS, 0.28 Ω R_DS(on) at V_GS = -10 V, and 8.5 A continuous drain current at T_C = 25 °C. It features 2.5 kV_RMS isolation, 175 °C max junction temperature, and is designed for high-voltage DC-DC converters and industrial motor control circuits requiring robust avalanche capability and thermal reliability.

For engineers reviewing the IRFI9Z24G datasheet, IRFI9Z24G pinout, IRFI9Z24G application, or IRFI9Z24G equivalent, this page delivers verified electrical parameters, validated TO-220 FULLPAK terminal mapping, confirmed body diode recovery characteristics (t_rr = 100–200 ns), isolated package construction details, and real-world selection guidance against comparable P-channel MOSFETs for high-side switching and reverse polarity protection.

Technical Context

This device implements a third-generation silicon process optimized for fast switching with low gate charge (Q_g = 19 nC) and reduced output capacitance (C_oss = 360 pF), enabling efficient operation in hard-switched topologies. Its isolated TO-220 FULLPAK construction eliminates need for mica insulators while maintaining 4.8 mm sink-to-lead creepage distance.

The IRFI9Z24G supports unclamped inductive switching with 200 mJ single-pulse avalanche energy and exhibits dynamic dV/dt immunity up to -4.5 V/ns. Its gate threshold voltage range (-2.0 to -4.0 V) ensures stable turn-on under varying drive conditions, and its body diode forward voltage is specified at -6.3 V at I_S = -8.5 A and T_J = 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	-60 V - Maximum blocking voltage for high-side switch or reverse polarity protection in 48 V systems
R_DS(on)	0.28 Ω @ V_GS = -10 V - Enables <1.5 W conduction loss at 8.5 A, suitable for thermally constrained PCB layouts
Q_g	19 nC - Low gate charge reduces driver power demand and enables faster switching in PWM controllers
E_AS	200 mJ - Supports reliable unclamped inductive turn-off in relay drivers and solenoid controls without snubbers
R_thJC	4.1 °C/W - Enables direct heatsink mounting with minimal thermal interface resistance for sustained 37 W dissipation
t_rr	100–200 ns - Fast body diode recovery minimizes cross-conduction losses in synchronous rectification or H-bridge freewheeling
V_GS(th)	-2.0 to -4.0 V - Ensures full enhancement with standard -10 V gate drive while rejecting noise-induced turn-on

Pinout & Package

IRFI9Z24G uses the TO-220 FULLPAK package: an isolated, surface-mount compatible variant of TO-220 with molded-in insulation between drain tab and leads. The drain is internally connected to the metal tab (heat sink interface), while source and gate are lead-formed terminals. Creepage distance from sink to lead is 4.8 mm; isolation rating is 2.5 kV_RMS/60 s.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	High-current power path, electrically tied to metal tab	Must be mounted to heatsink with insulated hardware or thermal pad; serves as primary heat extraction path and high-side switching node
Source	Reference node for gate drive and current return	Connected to system ground or floating rail; defines V_GS reference; carries full load current in high-side configuration
Gate	Control input for channel modulation	Requires negative voltage relative to source to turn on; sensitive to ESD; must be driven with low-impedance path to avoid oscillation

Key Features

Feature	Design Value
Isolated TO-220 FULLPAK construction	Eliminates external mica washers and mounting insulators-reduces BOM count and assembly cost in commercial-industrial power supplies
2.5 kV_RMS isolation (60 s)	Meets reinforced insulation requirements for Class I equipment per IEC 60950-1 and IEC 62368-1 in 230 V AC input stages
175 °C maximum junction temperature	Supports operation in sealed enclosures or high-ambient environments without derating below 100 °C case temperature
Dynamic dV/dt rating of -4.5 V/ns	Prevents false turn-on during fast voltage transients in motor drives and inverter outputs
Low R_thJC = 4.1 °C/W	Enables 37 W continuous power dissipation with only 150 °C ΔT to heatsink-no forced air required in many applications

Applications

Reverse Polarity Protection	High-Side Load Switch
Use Scenario: Protecting 24–48 V battery-powered equipment (e.g., portable test instruments, medical carts) from damage due to incorrect battery insertion. IC Role / Device Role / Timing Role: P-channel MOSFET configured as high-side switch with gate driven by simple resistor-Zener or dedicated controller. Use Value: IRFI9Z24G's -60 V rating and 0.28 Ω R_DS(on) limit voltage drop to <240 mV at 8.5 A, minimizing power loss and heat generation during normal operation.	Use Scenario: Enabling/disabling power to subsystems (e.g., display backlight, sensor array) in industrial PLC modules where ground-referenced switching is unsafe. IC Role / Device Role / Timing Role: High-side power switch controlled by microcontroller GPIO via level-shifting circuitry. Use Value: IRFI9Z24G's -4.0 V max V_GS(th) ensures reliable turn-on with -10 V gate drive, while its 175 °C rating sustains operation during transient overloads without thermal shutdown.
DC-DC Converter Top Switch	Relay/Solenoid Driver
Use Scenario: Upper switch in non-synchronous buck converter for 12 V → 5 V conversion in telecom shelf management units. IC Role / Device Role / Timing Role: Main switching element operating at 100–500 kHz with unclamped inductive turn-off stress. Use Value: IRFI9Z24G's 200 mJ E_AS absorbs energy from leakage inductance spikes, eliminating need for external clamping diodes in cost-sensitive designs.	Use Scenario: Driving 24 V DC relays and pneumatic solenoids in factory automation I/O modules subject to frequent switching and inductive kickback. IC Role / Device Role / Timing Role: Interface between logic-level controller and inductive load; handles both steady-state current and flyback energy. Use Value: IRFI9Z24G's -34 A pulsed drain current and 100–200 ns t_rr ensure clean turn-off and minimize contact arcing, extending relay life and reducing EMI.

Reverse Polarity Protection

High-Side Load Switch

Use Scenario: Protecting 24–48 V battery-powered equipment (e.g., portable test instruments, medical carts) from damage due to incorrect battery insertion.

IC Role / Device Role / Timing Role: P-channel MOSFET configured as high-side switch with gate driven by simple resistor-Zener or dedicated controller.

Use Value: IRFI9Z24G's -60 V rating and 0.28 Ω R_DS(on) limit voltage drop to <240 mV at 8.5 A, minimizing power loss and heat generation during normal operation.

Use Scenario: Enabling/disabling power to subsystems (e.g., display backlight, sensor array) in industrial PLC modules where ground-referenced switching is unsafe.

IC Role / Device Role / Timing Role: High-side power switch controlled by microcontroller GPIO via level-shifting circuitry.

Use Value: IRFI9Z24G's -4.0 V max V_GS(th) ensures reliable turn-on with -10 V gate drive, while its 175 °C rating sustains operation during transient overloads without thermal shutdown.

DC-DC Converter Top Switch

Relay/Solenoid Driver

Use Scenario: Upper switch in non-synchronous buck converter for 12 V → 5 V conversion in telecom shelf management units.

IC Role / Device Role / Timing Role: Main switching element operating at 100–500 kHz with unclamped inductive turn-off stress.

Use Value: IRFI9Z24G's 200 mJ E_AS absorbs energy from leakage inductance spikes, eliminating need for external clamping diodes in cost-sensitive designs.

Use Scenario: Driving 24 V DC relays and pneumatic solenoids in factory automation I/O modules subject to frequent switching and inductive kickback.

IC Role / Device Role / Timing Role: Interface between logic-level controller and inductive load; handles both steady-state current and flyback energy.

Use Value: IRFI9Z24G's -34 A pulsed drain current and 100–200 ns t_rr ensure clean turn-off and minimize contact arcing, extending relay life and reducing EMI.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF9Z34N	V_DS = -55 V, R_DS(on) = 0.28 Ω @ -10 V, Q_g = 24 nC, non-isolated TO-220	Lacks 2.5 kV isolation and creepage clearance; requires external insulator for high-voltage mounting	Select when isolation is not required and lower gate charge is not critical; verify heatsink insulation separately.
STP9PF55	V_DS = -55 V, R_DS(on) = 0.30 Ω @ -10 V, Q_g = 16 nC, TO-220FP (isolated)	Lower Q_g but higher R_DS(on); same isolation class but different thermal profile (R_thJC = 4.5 °C/W)	Prefer for higher-frequency switching where gate drive loss dominates; confirm layout compatibility with TO-220FP footprint.

Compared with IRF9Z34N and STP9PF55, the IRFI9Z24G offers superior isolation integrity and tighter thermal resistance, making it optimal for safety-critical 48 V industrial systems where board space precludes discrete insulation and thermal margin is constrained.

Availability

IRFI9Z24G is available at Aetrix Electronics and suitable for reverse polarity protection, high-side load switching, and DC-DC converter top-switch applications requiring stable component supply, long-term lifecycle support, and certified isolation performance.

Supply support for IRFI9Z24G 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 MOSFETs, diodes, and optoelectronics with emphasis on high-reliability, high-voltage, and thermally optimized power devices.

The IRFI9Z24G belongs to Vishay's third-generation high-voltage P-channel MOSFET family, engineered specifically for isolated high-side switching in industrial power supplies, battery management, and ruggedized control systems demanding 175 °C operation and reinforced insulation.

FAQ

What is the maximum continuous drain current for IRFI9Z24G at 100 °C case temperature?

The IRFI9Z24G supports -6.0 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limits imposed by the 4.1 °C/W junction-to-case resistance and 175 °C maximum junction temperature. Designers must ensure heatsink design maintains T_C ≤ 100 °C to sustain this current without exceeding T_J limits. The IRFI9Z24G datasheet provides Fig. 9 for precise derating curves across temperature.

Does IRFI9Z24G require a gate resistor for stability in switching applications?

Yes, the IRFI9Z24G requires an external gate resistor to dampen ringing and prevent parasitic oscillation during switching. Typical values range from 10 Ω to 47 Ω depending on drive strength and layout inductance. The datasheet specifies switching times using R_G = 18 Ω (Fig. 10), and recommends low-inductance gate loop routing. Without proper gate resistance, the IRFI9Z24G's 19 nC gate charge and low input capacitance can excite PCB trace inductance, leading to EMI and unreliable turn-on/turn-off behavior.

Can IRFI9Z24G be used in synchronous rectification topologies?

No, the IRFI9Z24G is not recommended for synchronous rectification due to its relatively slow body diode recovery time (t_rr = 100–200 ns) and high V_SD (-6.3 V). Synchronous rectifiers require fast, low-V_F body diodes or external Schottky co-packaging to minimize conduction and switching losses. The IRFI9Z24G's design prioritizes high-voltage isolation and avalanche ruggedness-not rectifier efficiency-making it unsuitable for secondary-side synchronous rectification in LLC or flyback converters.

What is the creepage distance between drain tab and leads for IRFI9Z24G?

The IRFI9Z24G provides a minimum creepage distance of 4.8 mm between the drain tab (sink) and source/gate leads, as explicitly stated in the Features section of the datasheet. This value satisfies reinforced insulation requirements for 250 V RMS working voltage per IEC 60664-1 and supports use in mains-connected equipment without additional spacing. The TO-220 FULLPAK molding compound achieves this clearance through controlled geometry and high-dielectric-strength encapsulation-no conformal coating or slotting is needed.

Is IRFI9Z24G RoHS-compliant and lead-free?

Yes, the IRFI9Z24G is RoHS-compliant and lead-free, as confirmed by the ordering code IRFI9Z24GPbF (where "PbF" denotes lead-free). Vishay documents compliance per EU RoHS Directive 2011/65/EU and China RoHS, with material declarations available under document number 99912. The device uses matte tin-plated leads and meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1, allowing unlimited floor life at ≤30 °C/60% RH.

IRFI9Z24G Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: TO-220-3 Full Pack, Isolated Tab

Packaging:: Tube

Product Status:: Obsolete

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 8.5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 280mOhm @ 5.1A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 19 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 570 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 37W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

IRFI9Z24G FAQ

1.How can I place an order for IRFI9Z24G through Aetrix?

Please submit a Request for Quotation (RFQ) for IRFI9Z24G 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 IRFI9Z24G reliable?

The price and inventory of IRFI9Z24G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFI9Z24G is usually 5 days.

3.What payment methods are accepted for IRFI9Z24G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFI9Z24G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRFI9Z24G?

IRFI9Z24G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRFI9Z24G 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 IRFI9Z24G?

For technical support, including IRFI9Z24G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFI9Z24G requirements.

6.How does Aetrix verify that IRFI9Z24G is sourced from the original manufacturer or authorized distributors?

All IRFI9Z24G 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 IRFI9Z24G meets industry standards.

7.What is the process for return or replacement of IRFI9Z24G?

All IRFI9Z24G units undergo pre-shipment inspection (PSI). If there is an issue with IRFI9Z24G, 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 IRFI9Z24G part is unused and in its original packaging.

Return procedure for IRFI9Z24G:

1.Submit a request within 90 days.

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

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