Skyworks Solutions Inc. SI8235AB-C-IMR

Overview

SI8235AB-C-IMR from Silicon Labs is a dual-channel isolated gate driver IC with 4.0 A peak output current per channel, 5 kVRMS input-to-output isolation (wide-body SOIC-16), 60 ns max propagation delay, and programmable dead time control. It operates across –40 to +125 °C and drives high-side/low-side or dual MOSFET/IGBT configurations in industrial inverters and motor control systems.

For engineers reviewing the SI8235AB-C-IMR datasheet, SI8235AB-C-IMR pinout, SI8235AB-C-IMR application, or SI8235AB-C-IMR equivalent, key selection criteria include its dual-driver topology (non-overlap logic), 4.0 A sink/source capability, reinforced insulation certification (UL/VDE/CSA/CQC), 2.5–5.5 V input supply range, and compatibility with 12–24 V gate drive rails.

Technical Context

The SI8235AB-C-IMR implements two independent RF-modulated isolated channels using Silicon Labs' proprietary silicon isolation barrier-no optocoupler or transformer required. Each channel features TTL-compatible inputs with 400 mV hysteresis and supports individual control via VIA/VIB pins.

It delivers 4.0 A peak sink and 2.0 A peak source current per output, with output resistance of 1.0 Ω (sink) and 2.7 Ω (source) at 12 V. Propagation delay is tightly controlled at ≤60 ns (max), pulse width distortion ≤5.6 ns, and common-mode transient immunity ≥45 kV/µs.

Key Specifications

Pinout & Package

SI8235AB-C-IMR is housed in a RoHS-compliant wide-body SOIC-16 package (10.3 mm × 10.3 mm, 2.54 mm pitch) with creepage/clearance ≥8.0 mm and 5 kVRMS isolation rating. Pin 1 is marked with a dot; pins 1–8 form the input side, pins 9–16 the isolated output side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8235AB-C-IMR, Si8235AD-C-IMR trades isolation robustness for lower cost and smaller footprint, while UCC5350MCDWVR adds Miller clamping at the expense of missing VDE certification-making SI8235AB-C-IMR optimal for safety-critical 5 kVRMS-requiring applications like grid-tied inverters and EV chargers.

Availability

SI8235AB-C-IMR is available at Aetrix Electronics and suitable for industrial motor drives, solar inverters, and EV onboard chargers requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for SI8235AB-C-IMR 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

Silicon Labs is a fabless semiconductor company specializing in precision timing, isolation, and mixed-signal ICs for industrial, automotive, and communications markets.

The Si823x product line delivers high-speed, high-isolation gate drivers targeting high-reliability power conversion systems-including inverters, UPS, motor drives, and EV infrastructure-where safety certification, timing accuracy, and noise immunity are critical.

FAQ

What is the isolation voltage rating of the SI8235AB-C-IMR?

The SI8235AB-C-IMR is rated for 5 kVRMS input-to-output isolation per UL 1577 (1 minute test), verified on the wide-body SOIC-16 package. This corresponds to reinforced insulation per IEC 60747-5-5 (VDE 0884-5), with minimum creepage and clearance of 8.0 mm. The device is production-tested to 6.0 kVRMS for 1 second, ensuring margin for long-term reliability in harsh environments.

Does the SI8235AB-C-IMR support programmable dead time?

Yes, the SI8235AB-C-IMR supports programmable dead time via an external resistor (RDT) connected to the DT pin. Dead time is adjustable from 70 ns (RDT = 6 kΩ) to 900 ns (RDT = 100 kΩ), with maximum RDT value limited to 220 kΩ. This feature enables precise shoot-through prevention in half-bridge and full-bridge topologies without firmware overhead.

What are the input logic thresholds for the SI8235AB-C-IMR?

The SI8235AB-C-IMR features TTL-compatible inputs with a logic high threshold (VIH) of ≥2.0 V and logic low threshold (VIL) of ≤0.8 V, plus 400 mV typical hysteresis. This ensures robust noise immunity against ground bounce and EMI in industrial control environments, and direct interfacing with 3.3 V or 5 V microcontrollers without external level shifters.

Can the SI8235AB-C-IMR drive both high-side and low-side switches simultaneously?

No-the SI8235AB-C-IMR is a dual-driver variant (not HS/LS), meaning both channels operate independently with no built-in overlap protection or complementary logic. For high-side/low-side control with automatic dead time, Silicon Labs offers the SI8233AB-C-IMR (4 A HS/LS) or SI8234AB-C-IMR (4 A PWM-input HS/LS). SI8235AB-C-IMR requires external logic to coordinate timing.

What safety certifications does the SI8235AB-C-IMR hold?

The SI8235AB-C-IMR holds UL 1577 (5 kVRMS), VDE 0884-5 (IEC 60747-5-5), CSA Component Acceptance Notice 5A (IEC 61010-1/60950-1/60601-1), and CQC GB4943.1 certifications. These cover reinforced insulation for industrial, medical, and consumer power systems up to 600 VRMS working voltage, with full documentation traceable to Silicon Labs' certification files E257455, 5006301-4880-0001, and V2012CQC001041.