Infineon Technologies IRF9953

Overview

IRF9953 from Infineon Technologies is a dual P-channel MOSFET in SO-8 package, configured as two independent enhancement-mode power switches with −30 V V_DS, 3.0 Ω R_DS(on) at V_GS = −10 V, and −2.3 A continuous drain current per channel. It operates in low-voltage DC-DC converters and load switching circuits where complementary drive and space-constrained dual-channel control are required.

For engineers reviewing the IRF9953 datasheet, IRF9953 pinout, IRF9953 application, or IRF9953 equivalent, key selection considerations include verified dual-channel P-MOSFET topology, SO-8 thermal performance (R_θJA = 70 °C/W), gate threshold voltage range (−1.0 V to −3.0 V), and avalanche energy rating (E_AS = 150 mJ).

Technical Context

This device integrates two matched P-channel MOSFETs in a single SO-8 package with isolated source terminals (S1, S2) and shared gate drive capability. Each channel supports −10 V gate drive, exhibits normalized R_DS(on) drift of ≤2.0× from −40 °C to +150 °C, and maintains stable switching behavior under 20 µs pulsed conditions up to T_J = 150 °C.

The dual configuration enables synchronous buck converter high-side switching, dual-rail load disconnect, and H-bridge half-bridge control without external cross-coupling. Gate charge parameters (Q_G = 12 nC, Q_GD = 4.8 nC at V_GS = −10 V) support efficient 100–500 kHz switching in compact power stages.

Key Specifications

Pinout & Package

IRF9953 uses the JEDEC-standard SO-8 (MS-012AA) surface-mount package with exposed drain pad for thermal enhancement. Dimensions: 4.9 × 6.0 × 1.27 mm (L × W × H), lead pitch 1.27 mm, 8-pin layout with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si7997DP and DMC2038LSD, IRF9953 offers the best balance of −30 V rating, moderate gate charge, and proven avalanche ruggedness-making it optimal for 12–24 V industrial and automotive load switching where reliability trumps ultra-low R_DS(on).

Availability

IRF9953 is available at Aetrix Electronics and suitable for USB PD power switches, industrial PLC output modules, automotive body control units, and medical power sequencing requiring stable component supply and long-term lifecycle assurance.

Supply support for IRF9953 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and AEC-Q101.

The IRF9953 belongs to Infineon's HEXFET® Power MOSFET product line, engineered for high-reliability DC-DC conversion, load switching, and motor control in harsh environments where thermal stability and transient robustness are critical.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The IRF9953 has a rated maximum junction temperature of 150 °C. Continuous operation at this limit requires strict adherence to derating curves: at T_A = 70 °C, maximum continuous I_D drops to −1.4 A per channel. Thermal design must account for R_θJA = 70 °C/W and ensure the exposed drain pad is soldered to ≥1 in² of 2-oz copper for full rating.

Can IRF9953 be used in synchronous rectification topologies?

No-IRF9953 is not designed for synchronous rectification. Its body diode forward voltage (V_SD ≈ 1.2 V) and relatively high R_DS(on) make it unsuitable for high-frequency, low-loss freewheeling paths. It lacks the optimized gate charge ratio (Q_GD/Q_G) and low V_SD required for efficient SR operation in buck converters above 100 kHz.

Is the SO-8 footprint compatible with standard IPC-7351B land patterns?

Yes-the IRF9953 SO-8 outline conforms to JEDEC MS-012AA and IPC-7351B "SOIC8_N" generic footprint. Recommended land pattern: 0.65 mm pad width, 1.45 mm pad length, 1.27 mm center-to-center pitch, with 2.5 mm × 3.5 mm thermal pad stencil opening and 0.25 mm thickness for optimal solder joint reliability.

Does IRF9953 support gate drive from 3.3 V microcontrollers without level shifting?

It can operate with 3.3 V gate drive but not optimally: at V_GS = −3.3 V, R_DS(on) rises to ~8.5 Ω (vs. 3.0 Ω at −10 V), increasing conduction loss 2.8×. For reliable −2.3 A operation, a −10 V gate drive or level-shifting circuit (e.g., TC4427-based inverter) is required to meet datasheet-specified current and thermal limits.