Skyworks Solutions Inc. SI8234AD-C-ISR

Overview

SI8234AD-C-ISR from Silicon Labs is a 4.0 A peak-output, high-side/low-side isolated gate driver with 5 kVRMS input-to-output isolation, 60 ns max propagation delay, and programmable dead time. It features PWM input architecture, operates from 6.5–24 V driver supply, and targets IGBT/MOSFET gate drive in solar inverters and motor control systems.

For engineers reviewing the SI8234AD-C-ISR datasheet, SI8234AD-C-ISR pinout, SI8234AD-C-ISR application, or SI8234AD-C-ISR equivalent, key selection criteria include its 4.0 A sink/source capability, 5 kVRMS reinforced insulation (UL/VDE/CSA/CQC certified), 8 MHz switching support, overlap protection, and SOIC-16 wide-body package compatibility with industrial temperature range (–40 to +125 °C).

Technical Context

The SI8234AD-C-ISR implements RF-based on/off keying across a silicon isolation barrier for robust noise immunity and zero initialization latency. Its dual-channel architecture supports independent high-side and low-side gate drive with integrated dead-time control via external resistor (70–900 ns range) and automatic overlap protection.

It uses TTL-compatible PWM input with >400 mV hysteresis, supports 2.7–5.5 V input supply, and features undervoltage lockout on both input (VDDIUV+ = 4.0 V typ.) and driver supplies (selectable 5/8/10/12.5 V thresholds). Common-mode transient immunity exceeds 45 kV/µs at 1500 VCM.

Key Specifications

Pinout & Package

SI8234AD-C-ISR is housed in a RoHS-compliant SOIC-16 wide-body package (WBSOIC-16) with 8.0 mm creepage/clearance and 5 kVRMS isolation rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side/low-side isolated gate drive applications.

Compared with Si8234BD-C-ISR and UCC21540DWPR, the SI8234AD-C-ISR uniquely combines 5 kVRMS isolation, single-PWM-input operation, hardware-programmable dead time, and overlap protection in one SOIC-16 wide-body package - reducing design complexity and component count in safety-critical power stages.

Availability

SI8234AD-C-ISR is available at Aetrix Electronics and suitable for solar inverters, industrial motor drives, and isolated DC-DC power supplies requiring stable component supply, long-term lifecycle support, and certified reinforced insulation.

Supply support for SI8234AD-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 precision timing, isolation, and mixed-signal ICs for industrial, automotive, and communications markets.

The Si823x family was designed specifically for high-reliability isolated gate driving in high-noise, high-dV/dt power conversion systems - emphasizing robustness, programmable timing control, and global safety certification compliance.

FAQ

What is the maximum switching frequency supported by the SI8234AD-C-ISR?

The SI8234AD-C-ISR supports up to 8 MHz switching frequency, enabled by its 60 ns maximum propagation delay, <5.6 ns pulse-width distortion, and 12 ns typical rise/fall times (CL = 200 pF). This makes it suitable for high-frequency resonant topologies like LLC and GaN-based converters where timing precision is critical. The SI8234AD-C-ISR maintains consistent performance across –40 to +125 °C ambient conditions.

Does the SI8234AD-C-ISR require external components for dead time configuration?

Yes - dead time is set externally using a single resistor (R_DT) connected between the DT pin and VDDI. Values from 6 kΩ to 220 kΩ program dead time from 70 ns to 900 ns. No capacitors or active components are needed. The SI8234AD-C-ISR integrates overlap protection logic that automatically disables outputs if both HS and LS commands coincide, ensuring fail-safe operation regardless of R_DT value.

What safety certifications apply to the SI8234AD-C-ISR?

The SI8234AD-C-ISR holds UL1577 (5000 Vrms, 1 min), CSA Component Notice 5A (IEC 60950-1/61010-1/60601-1), VDE IEC 60747-5-5 and EN 60950-1 (reinforced insulation), and CQC GB4943.1 certifications. These apply specifically to the WBSOIC-16 package variant and confirm 5 kVRMS isolation, 891 V_peak working voltage, and pollution degree 2 compliance - validated per DIN EN 60747-5-5 test protocols.

Can the SI8234AD-C-ISR drive both IGBTs and SiC MOSFETs?

Yes - the SI8234AD-C-ISR's 4.0 A peak sink/source current, 1.0 Ω typical sink resistance, and 2.7 Ω typical source resistance enable direct drive of medium-power IGBTs (Q_G ≤ 150 nC) and discrete SiC MOSFETs (Q_G ≤ 50 nC) at 24 V gate supply. Its 45 kV/µs CMTI and fast 60 ns propagation ensure reliable operation in high-dV/dt SiC half-bridges. Layout best practices (short gate loops, local decoupling) remain essential for optimal switching performance of the SI8234AD-C-ISR.

How does the SI8234AD-C-ISR handle undervoltage conditions on its power supplies?

The SI8234AD-C-ISR implements independent undervoltage lockout (UVLO) on all three supply domains: VDDI (trip at 4.0 V typ., 250 mV hysteresis), and selectable VDDA/VDDB thresholds (5/8/10/12.5 V). When any supply drops below UVLO, outputs force low and remain latched until recovery. This prevents partial turn-on of power devices. The SI8234AD-C-ISR also features internal disable functionality via the DISABLE pin, allowing system-level fault shutdown independent of supply status.