Skyworks Solutions Inc. SI8220BB-A-IS

Overview

SI8220BB-A-IS from Skyworks Solutions is a 2.5 A peak-output isolated gate driver with opto-emulator input, 5.0 kVRMS isolation rating (UL 1577), 60 ns max propagation delay, and –40 to +125 °C operating range. It replaces HCPL-3120/HCPL-0302 in IGBT/MOSFET gate drive circuits for industrial inverters and UPS systems.

For engineers reviewing the SI8220BB-A-IS datasheet, SI8220BB-A-IS pinout, SI8220BB-A-IS application, or SI8220BB-A-IS equivalent, key selection criteria include its 5.0 kVRMS reinforced insulation, UVLO hysteresis of 1000 mV (12.5 V threshold), 30 kV/µs CMTI, and SOIC-8 narrow-body package compatibility with legacy opto-driver footprints.

Technical Context

The SI8220BB-A-IS implements RF-based on/off keying across a silicon isolation barrier-replacing LED/photodiode coupling-to deliver propagation delay independent of input current, tighter part-to-part matching (14× vs. opto), and stable performance over temperature and lifetime. Its input emulates an LED but requires only 5–20 mA forward current.

Internally, it integrates under-voltage lockout with 12.5 V turn-on threshold (VDDUV+ = 12.4–14.8 V) and 1000 mV hysteresis, output driver stages capable of 2.5 A sink/source peak current, and robust transient immunity (30 kV/µs common-mode dv/dt). The device operates with VDD = 6.5–24 V and supports gate drive for high-side or low-side switching topologies.

Key Specifications

Pinout & Package

SI8220BB-A-IS is housed in an ROHS-compliant SOIC-8 narrow-body package (5.3 mm width, 5.0 mm body length), with creepage/clearance ≥4.01 mm / 4.9 mm and 100 °C/W junction-to-air thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HCPL-3120, SI8220BB-A-IS delivers 8× faster propagation, eliminates LED degradation, and supports 100 kHz+ switching; versus Si8233AD-A-IS, it offers single-channel simplicity and lower BOM count where dual drive is unnecessary.

Availability

SI8220BB-A-IS is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies, and solar inverters requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for SI8220BB-A-IS 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, timing, and isolation technologies.

The Si8220 family was designed specifically for high-reliability, high-speed isolated gate driving in industrial and automotive power conversion systems-replacing aging optocouplers with silicon-based isolation.

FAQ

What is the isolation voltage rating of the SI8220BB-A-IS and which safety standards does it meet?

The SI8220BB-A-IS has a 5.0 kVRMS isolation rating per UL 1577 (1 minute), certified to CSA Component Notice 5A, VDE IEC 60747-5-5, and CQC GB4943.1. It supports up to 600 VRMS reinforced insulation working voltage per IEC 60950-1 and IEC 60601-1, making it suitable for medical and industrial safety-critical applications. This rating applies specifically to the SI8220BB-A-IS variant.

Does the SI8220BB-A-IS require external components for stable operation?

Yes-the SI8220BB-A-IS requires local decoupling: a 0.1 µF ceramic capacitor between VDD (pin 4) and VSS (pin 3), plus a 10 µF bulk capacitor nearby. Input current limiting (e.g., series resistor) is needed if driving from >20 mA sources. No bootstrap diodes, level shifters, or external UVLO circuitry is required-the SI8220BB-A-IS integrates all essential functions internally.

Can the SI8220BB-A-IS replace HCPL-3120 directly on existing PCBs?

Yes-the SI8220BB-A-IS uses the same SOIC-8 narrow-body footprint and pinout as HCPL-3120 (ANODE, CATHODE, VSS, VDD, VO, VSS, NC, NC), enabling drop-in replacement. However, input current should be limited to ≤20 mA, and VDD must stay ≤24 V. Layout changes are not required, but decoupling capacitor placement should follow Skyworks' recommended proximity guidelines for optimal noise immunity.

What is the maximum switching frequency supported by the SI8220BB-A-IS?

The SI8220BB-A-IS supports switching frequencies up to 2 MHz in gate drive applications, constrained primarily by external gate capacitance and layout parasitics-not internal timing. At CL = 200 pF, its 20 ns output fall time and 60 ns max propagation delay enable reliable operation at 500 kHz–1 MHz in SiC/GaN half-bridges. Thermal limits (1.2 W max PD) govern sustained high-frequency use in compact enclosures.

How does the UVLO function behave during power-up and brownout conditions for the SI8220BB-A-IS?

During power-up, the SI8220BB-A-IS holds VO low until VDD rises above 12.4 V (min) and remains above that threshold for ≥40 µs (tSTART). During brownout, VO is forced low when VDD falls below 11.6 V (min), with 1000 mV hysteresis preventing chatter. This behavior is fully specified in the SI8220BB-A-IS datasheet Figures 12 and Table 1, ensuring predictable gate control across line sags and soft-start sequences.