Skyworks Solutions Inc. SI8235AB-ASR

Overview

SI8235AB-ASR from Skyworks Solutions is a dual-channel isolated gate driver IC with 4.0 A peak output current per channel, 2.5 kVRMS input-to-output isolation, and TTL-compatible dual-input (VIA/VIB) logic interface. It operates across –40°C to +125°C, supports up to 8 MHz switching frequency, and is designed for high-reliability isolated MOSFET/IGBT drive in automotive onboard chargers and industrial inverters.

For engineers reviewing the SI8235AB-ASR datasheet, SI8235AB-ASR pinout, SI8235AB-ASR application, or SI8235AB-ASR equivalent, this page delivers verified specifications, package mapping, functional truth table behavior, automotive-grade qualification evidence (AEC-Q100), and real-world design context for half-bridge and dual-switch topologies.

Technical Context

The SI8235AB-ASR implements two fully independent isolated channels using Skyworks' proprietary silicon RF isolation barrier, enabling operation with separate or common grounds on output sides. Each channel features undervoltage lockout (UVLO) monitoring on VDDA and VDDB independently, with 5 V UVLO threshold and fast 45 ns propagation delay (typical).

As a dual-driver variant (not HS/LS), it lacks programmable dead time and overlap protection-outputs respond immediately to input transitions without internal delay. Its TTL-compatible VIA/VIB inputs include >400 mV hysteresis, and the DISABLE pin forces both outputs low when asserted, with tSD ≤ 100 ns and tRESTART ≤ 7 µs after release.

Key Specifications

Pinout & Package

SI8235AB-ASR is housed in a RoHS-compliant SOIC-16 narrow body package (5.3 mm × 10.3 mm, 1.27 mm pitch) with reinforced creepage for 2.5 kVRMS isolation. Pin 1 is marked with a dot; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel isolated gate driver applications.

Compared with Si8235AD-ASR, SI8235AB-ASR reduces board area and cost while maintaining identical functionality for 2.5 kVRMS-rated systems; versus UCC5390SCDR, it provides superior output current and independent UVLO but omits Miller clamping - requiring external diodes in SiC designs.

Availability

SI8235AB-ASR is available at Aetrix Electronics and suitable for automotive onboard chargers, battery management systems, and solar inverters requiring stable component supply with long-term lifecycle assurance and automotive-grade traceability.

Supply support for SI8235AB-ASR 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

Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, isolation, and precision timing technologies.

The Si823x family was engineered specifically for high-reliability isolated gate drive in automotive electrification and industrial power conversion, emphasizing robustness, fast timing, and AEC-Q100-compliant manufacturing.

FAQ

What is the isolation voltage rating of the SI8235AB-ASR?

The SI8235AB-ASR has a certified 2.5 kVRMS input-to-output isolation rating per UL1577, validated for one-minute withstand testing. This rating applies to the SOIC-16 narrow-body package and supports reinforced insulation in systems up to 400 VAC working voltage, meeting IEC 62368-1 and IEC 60601-1 (2 MOPP) safety standards. The isolation barrier uses Skyworks' proprietary silicon RF technology, not optocoupler-based construction.

Does the SI8235AB-ASR support programmable dead time?

No, the SI8235AB-ASR does not support programmable dead time or overlap protection. As a dual-driver variant (not high-side/low-side), it lacks the DT pin and internal logic for controlled transition delays. Inputs VIA and VIB directly control outputs VOA and VOB with immediate response - no intentional delay is inserted between channel transitions. For dead-time-critical topologies, SI8233AB-ASR or SI8234AB-ASR should be selected instead.

What are the UVLO thresholds for the SI8235AB-ASR?

The SI8235AB-ASR features independent undervoltage lockout (UVLO) on all three supply rails: VDDI has a 5 V threshold (±5%), while VDDA and VDDB each have a 5 V UVLO threshold with hysteresis. When any supply falls below its UVLO– level, the corresponding functional block disables - VDDI UVLO halts input-side operation, and VDDA/VDDB UVLO forces VOA/VOB low. This ensures fail-safe behavior in multi-rail power systems.

Is the SI8235AB-ASR pin-compatible with other Si823x variants?

The SI8235AB-ASR shares the same SOIC-16 narrow-body pinout with all Si823x variants in that package family, including SI8235BB-ASR and SI8235CB-ASR. However, pin compatibility does not imply functional equivalence: SI8235AB-ASR uses 5 V UVLO and 2.5 kVRMS isolation, whereas SI8235BB-ASR has 8 V UVLO and SI8235CB-ASR is in LGA-14. Always verify UVLO, isolation rating, and package type before substitution.

What automotive qualifications does the SI8235AB-ASR hold?

The SI8235AB-ASR is AEC-Q100 qualified to Grade 1 (–40°C to +125°C ambient), manufactured using full automotive process flows with zero-defect methodology, AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations. Its top marking includes an automotive manufacturing code (first character N–Z), and it is explicitly listed in Skyworks' automotive OPN table as SI8235AB-ASR - confirming its status as a production-ready automotive-grade device.