Skyworks Solutions Inc. SI8235AD-C-ISR

Overview

SI8235AD-C-ISR 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 package), 60 ns max propagation delay, and operation across –40 to +125 °C. It serves as a reinforced-isolation replacement for optocoupler-based gate drivers in high-reliability IGBT/MOSFET half-bridge and dual-switch topologies.

For engineers reviewing the SI8235AD-C-ISR datasheet, SI8235AD-C-ISR pinout, SI8235AD-C-ISR application, or SI8235AD-C-ISR equivalent, this page delivers verified electrical specs, safety-certified isolation ratings, thermal derating data, programmable dead-time configuration, and real-world motor control and inverter use cases - all validated against Silicon Labs Rev. 1.5 documentation.

Technical Context

The SI8235AD-C-ISR implements RF-based on/off keying across a silicon-die isolation barrier, enabling robust noise immunity (>45 kV/µs CMTI) without startup initialization or external clocking. Its dual independent channels operate with separate input-side (VDDI) and driver-side (VDDA/VDDB) supplies, supporting grounded or floating output configurations.

Unlike HS/LS variants (e.g., SI8233), the SI8235AD-C-ISR lacks overlap protection and programmable dead time - confirmed by Table 9 (Si823x Family Overview) and truth table behavior showing immediate output transitions. It accepts TTL-compatible inputs (VIA/VIB) with 400 mV hysteresis and supports up to 8 MHz switching frequency.

Key Specifications

Pinout & Package

SI8235AD-C-ISR uses a 16-pin wide-body SOIC (WBSOIC-16) package with creepage/clearance ≥8.0 mm and 5 kVRMS isolation rating. Pin functions are electrically isolated between input (Pins 1–8) and output (Pins 9–16) sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8235BD-C-ISR, the SI8235AD-C-ISR provides higher isolation voltage for demanding industrial mains-connected equipment; compared with ADUM4223BRIZ, it delivers double the peak current and integrated disable functionality essential for functional safety architectures.

Availability

SI8235AD-C-ISR is available at Aetrix Electronics and suitable for motor control systems, solar inverters, and isolated DC-DC power supplies requiring stable component supply, long-term lifecycle assurance, and full regulatory compliance documentation.

Supply support for SI8235AD-C-ISR 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 high-performance analog-intensive mixed-signal ICs for timing, isolation, wireless, and MCU applications.

The SI823x product line was designed specifically for replacing optocoupler-based gate drivers in high-reliability power conversion systems, emphasizing robust isolation, low propagation delay, and AEC-Q100 qualification for automotive and industrial use.

FAQ

What is the isolation voltage rating of the SI8235AD-C-ISR?

The SI8235AD-C-ISR is rated for 5 kVRMS input-to-output isolation (1 minute, UL 1577), achieved via its wide-body SOIC-16 package with ≥8.0 mm creepage and clearance. This corresponds to 600 VRMS reinforced working voltage per IEC 60950-1 and IEC 60747-5-5, making it suitable for mains-connected industrial equipment and automotive traction inverters.

Does the SI8235AD-C-ISR support programmable dead time?

No, the SI8235AD-C-ISR does not support programmable dead time or overlap protection. As confirmed in Table 9 (Si823x Family Overview) and Section 3.3.2, only HS/LS variants (SI8230/1/3/4) include DT control and overlap logic. The SI8235AD-C-ISR is a dual-driver variant with immediate output transitions and no internal dead-time circuitry.

What is the maximum switching frequency supported by the SI8235AD-C-ISR?

The SI8235AD-C-ISR supports up to 8 MHz switching frequency, as specified in the "Features" section of the datasheet. This capability is enabled by its 60 ns maximum propagation delay, 12 ns typical rise/fall times (CL = 200 pF), and low pulse-width distortion (<5.6 ns), allowing clean PWM edge fidelity in high-frequency resonant and soft-switching topologies.

Can the SI8235AD-C-ISR drive both high-side and low-side switches in a half-bridge?

No - the SI8235AD-C-ISR is a dual-channel driver with independent outputs (VOA/VOB), but it lacks built-in high-side/low-side logic coordination, overlap protection, or complementary input decoding. It can drive two separate switches (e.g., two low-side MOSFETs or two isolated half-bridges), but not a single half-bridge pair requiring complementary timing. For HS/LS control, SI8233AD-C-ISR or SI8234AD-C-ISR must be used.

What safety certifications apply to the SI8235AD-C-ISR?

The SI8235AD-C-ISR holds UL 1577 (5000 Vrms), CSA Component Acceptance Notice 5A (IEC 60950-1/61010-1/60601-1), VDE IEC 60747-5-5, and CQC GB4943.1 certifications. All apply to the 5 kVRMS-rated wide-body SOIC-16 variant (SI8235AD-C-ISR), with reinforced insulation ratings validated per DIN EN 60747-5-5 and IEC 60664-1.