Vishay Siliconix IRF9Z20PBF

Overview

IRF9Z20PBF from Vishay Siliconix is a P-channel enhancement-mode power MOSFET in TO-220AB package, rated for -50 V V_DS, 9.7 A continuous drain current at 25 °C, and 0.28 Ω R_DS(on) at V_GS = -10 V. It serves as a high-reliability reverse-polarity switch in DC power stages, motor control H-bridges, and synchronous rectification circuits.

For engineers reviewing the IRF9Z20PBF datasheet, IRF9Z20PBF pinout, IRF9Z20PBF application, or IRF9Z20PBF equivalent, this page delivers verified electrical parameters, thermal resistance values, gate charge characteristics, body diode performance, and real-world design implications - all confirmed from Vishay's official S16-0015-Rev. C datasheet.

Technical Context

This device uses planar V-groove silicon technology to achieve low on-resistance with high transconductance (3.5 S typ.) and rugged avalanche capability (2.2 A unclamped inductive). Its P-channel topology enables high-side switching without level-shifting circuitry in buck regulators and battery protection circuits.

The IRF9Z20PBF features fast switching (t_d(on) = 12 ns max, t_f = 38 ns max), low gate charge (Q_g = 26 nC max), and stable R_DS(on) over temperature (2.4× increase from -55 °C to 150 °C). Its integral body diode has t_rr = 280 ns max and Q_rr = 0.85 μC max, supporting moderate-frequency hard-switched topologies.

Key Specifications

Pinout & Package

IRF9Z20PBF is housed in a through-hole TO-220AB package with standard three-terminal layout: Drain (D) connected to tab, Source (S) and Gate (G) on leads. The metal tab is electrically connected to the Drain, requiring isolation when mounted to heatsinks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRF9Z34NPBF, the IRF9Z20PBF delivers lower gate charge and faster switching at the expense of 5 V lower V_DS rating; versus SiHF9Z20-E3, it shares identical performance but differs only in packaging format and plating specification - making IRF9Z20PBF ideal for through-hole evaluation and small-batch builds.

Availability

IRF9Z20PBF is available at Aetrix Electronics and suitable for battery management systems, industrial motor drives, offline auxiliary supplies, and PLC output stages requiring stable component supply across extended product lifecycles.

Supply support for IRF9Z20PBF 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, thermal performance, and reliability.

The IRF9Z20PBF belongs to Vishay's legacy Z-series P-channel MOSFET family, engineered for cost-sensitive industrial and automotive-adjacent power switching where robustness and ease of use outweigh ultra-high-frequency optimization.

FAQ

What is the maximum continuous drain current for IRF9Z20PBF at 100 °C case temperature?

The IRF9Z20PBF supports -6.1 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limitations of the TO-220AB package and must be validated against actual board-level thermal resistance and ambient conditions in the final design. Always verify junction temperature using R_thJC = 3.1 °C/W and measured T_C before finalizing heatsink selection for IRF9Z20PBF.

Does IRF9Z20PBF have avalanche capability, and how is it rated?

Yes, the IRF9Z20PBF is rated for unclamped inductive switching with I_L = -2.2 A and E_AS ≈ 110 mJ (typical, derived from V_DD = -25 V, L = 100 μH, R_g = 25 Ω test conditions). This ruggedness enables reliable operation in relay driving and motor commutation without external snubbers. The IRF9Z20PBF datasheet confirms repetitive avalanche capability under defined pulse conditions - critical for validating stress margins in IRF9Z20PBF-based H-bridge designs.

Can IRF9Z20PBF be used as a direct replacement for IRF9Z22PBF?

No - the IRF9Z20PBF and IRF9Z22PBF are distinct parts: IRF9Z20PBF has R_DS(on) = 0.28 Ω max at -10 V, while IRF9Z22PBF is rated at 0.18 Ω max. Their gate charge and dynamic parameters also differ. Although both are P-channel TO-220AB MOSFETs, they are not functionally interchangeable without circuit validation. Substituting IRF9Z20PBF for IRF9Z22PBF may increase conduction loss and thermal stress; always consult Vishay's parametric comparison before replacement in IRF9Z20PBF applications.

What is the gate threshold voltage range for IRF9Z20PBF, and why does it matter?

The IRF9Z20PBF has a V_GS(th) range of -2.0 V to -4.0 V at I_D = -250 μA. This defines the minimum gate voltage needed to initiate conduction and impacts logic-level compatibility. A -5 V gate drive ensures full enhancement, while marginal -3 V drive may yield inconsistent R_DS(on). For reliable switching in IRF9Z20PBF-based battery disconnect circuits, maintain V_GS ≤ -5 V to avoid partial turn-on and excessive heating during transition states.

Is IRF9Z20PBF suitable for synchronous rectification in DC-DC converters?

The IRF9Z20PBF can serve in low-frequency (<100 kHz) synchronous rectification roles due to its low R_DS(on) and integral body diode, but its 280 ns max t_rr and 0.85 μC max Q_rr limit efficiency at higher frequencies. For optimal performance in IRF9Z20PBF-based synchronous rectifiers, pair it with precise gate timing control to minimize body diode conduction time and avoid cross-conduction. Not recommended for >200 kHz phase-shifted or resonant topologies without additional characterization.