Skyworks Solutions Inc. SI8232BB-B-IS1R

Overview

SI8232BB-B-IS1R from Silicon Laboratories is a dual-channel isolated gate driver IC with 0.5 A peak output current per channel, 5 kVRMS input-to-output isolation (wide-body SOIC-16), 60 ns max propagation delay, and operation across –40 to +125 °C. It serves as a robust replacement for optocoupler-based gate drive in half-bridge MOSFET/IGBT control circuits.

For engineers reviewing the SI8232BB-B-IS1R datasheet, SI8232BB-B-IS1R pinout, SI8232BB-B-IS1R application, or SI8232BB-B-IS1R equivalent, key selection criteria include its dual independent isolated outputs, absence of programmable dead time or overlap protection (unlike HS/LS variants), TTL-compatible inputs with 400 mV hysteresis, and compatibility with 2.7–5.5 V input supply and 6.5–24 V driver supplies.

Technical Context

The SI8232BB-B-IS1R implements RF-based on/off keying across a silicon isolation barrier-eliminating startup initialization and providing superior CMTI (>45 kV/µs) versus optical or capacitive alternatives. Each channel operates independently with no internal cross-coupling, enabling asynchronous dual-drive configurations.

It lacks integrated dead-time control or overlap protection logic (per Table 9), distinguishing it from Si8230/1/3/4 family members. Input logic states directly map to output states with no internal timing constraints-enabling immediate edge response and deterministic dual-channel switching without interlock delays.

Key Specifications

Pinout & Package

SI8232BB-B-IS1R is housed in a RoHS-compliant 16-pin wide-body SOIC package (WBSOIC-16) with 8.0 mm creepage/clearance, rated for 5 kVRMS isolation. Pin assignments are validated per Silicon Labs Rev. 1.5 datasheet Section 5 ("Pin Descriptions") and Figure 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si8232BB-B-IS and ADuM4223BRIZ, SI8232BB-B-IS1R uniquely delivers 5 kVRMS certified isolation in a dual-driver configuration without dead-time logic - making it optimal for space-constrained, high-safety industrial inverters where deterministic dual-channel timing is critical and external dead-time generation is preferred.

Availability

SI8232BB-B-IS1R is available at Aetrix Electronics and suitable for motor control systems, isolated dc-dc power supplies, solar inverters, and lighting control systems requiring stable component supply, long-term lifecycle support, and certified high-voltage isolation.

Supply support for SI8232BB-B-IS1R 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 Laboratories is a fabless semiconductor company specializing in precision timing, isolation, and mixed-signal ICs for industrial, automotive, and communications markets.

The Si823x product line was designed specifically for high-reliability isolated gate drive in power conversion systems - emphasizing robustness against CMTI, extended temperature operation, and regulatory compliance across global safety standards.

FAQ

What is the isolation voltage rating of the SI8232BB-B-IS1R?

The SI8232BB-B-IS1R is rated for 5 kVRMS input-to-output isolation per UL 1577, validated for 1 minute. This rating applies exclusively to the wide-body SOIC-16 package (WBSOIC-16) used in this variant. The isolation barrier is based on Silicon Labs' proprietary silicon-dielectric technology, not optical coupling.

Does the SI8232BB-B-IS1R support programmable dead time?

No, the SI8232BB-B-IS1R does not include programmable dead time or overlap protection circuitry. As confirmed in Table 9 of the Si823x datasheet, these features are exclusive to high-side/low-side variants (e.g., Si8230/1/3/4). SI8232BB-B-IS1R provides two fully independent isolated channels with direct input-to-output mapping and no internal timing interlocks.

What are the valid supply voltage ranges for SI8232BB-B-IS1R inputs and outputs?

The SI8232BB-B-IS1R requires VDDI = 2.7–5.5 V on the input side and supports VDDA/VDDB = 6.5–24 V on each output side. These are independent supply domains. Operation outside these ranges - including exceeding 24 V on VDDA/VDDB or applying <2.7 V to VDDI - violates absolute maximum ratings and may cause permanent damage or functional failure.

Can SI8232BB-B-IS1R drive IGBTs directly?

Yes, the SI8232BB-B-IS1R can directly drive small-to-medium IGBTs requiring ≤0.5 A peak gate current. Its 0.5 A sink capability (per Table 1) and low R_ON(SINK) of 5.0 Ω support gate charge delivery for IGBTs with Q_G ≤ 25 nC at 15–20 V V_GE. For larger IGBTs, external gate buffers are recommended to maintain switching speed and reduce driver thermal stress.

Is SI8232BB-B-IS1R qualified for automotive applications?

No, SI8232BB-B-IS1R is not AEC-Q100 qualified. While the broader Si823x family includes AEC-Q100 qualified variants (e.g., Si823x-AQ series), the SI8232BB-B-IS1R part number is specified for industrial temperature range (–40 to +125 °C) and carries no automotive qualification documentation. Use only in non-automotive applications unless re-qualified per customer-specific requirements.