SI8421AB-C-IS

SI8421AB-C-IS is a dual-channel isolated gate driver. It provides galvanic isolation between a logic input side and an isolated output stage that drives two MOSFETs/IGBTs. Each channel has a logic input and a corresponding gate-drive output (totem-pole) with fast transitions. The device includes features such as undervoltage lockout and protected turn-on/turn-off to prevent shoot-through and faults. It’s intended for isolated power stages in converters, motor drives, inverters, and other high-voltage power electronics where the controller is isolated from the high-voltage side. The “C-IS” suffix indicates the isolation/packaging variant (industrial/coated options). Typical specs (from the datasheet) cover Viso isolation rating, operating temperature range, and an 8-pin package (SO-8). For exact electrical figures (thresholds, propagation delay, rise/fall times, UVLO values), consult the official datasheet.

Equivalents depend on isolation rating, speed and channel count. For a dual-channel digital isolator like SI8421AB-C-IS, common cross-refs include:
- TI ISO7720/7721 and ISO7840/7842
- Broadcom/Avago HCPL-7800/7802 and HCPL-7840/7842
- Analog Devices ADuM7440/7441 and ADuM1250/1251
- Onsemi NCV7800-series
- Silicon Labs SI8420/8422/8423 (same family)
Confirm specs (Viso, speed, package) for exact match.

Si8421AB-C-IS is Silicon Labs’ isolated digital isolator (iCoupler family). Key features (typical):
- Galvanic isolation between two logic domains (barrier protection)
- Industrial-temperature device (wide operating temp range)
- Compatible with 3.3 V and 5 V logic on both sides
- High-speed digital data transfer across the barrier (fast propagation)
- High common-mode transient immunity (CMTI) for robustness against transients
- Low power consumption
- ESD/short-circuit protection on I/O
- Available in compact packaging options (e.g., 8-pin package)
- Includes safety/compliance readiness (UL/IEC style certifications) per family
Note: exact numbers (isolation voltage, data rate, propagation delay, CMTI, power, temp range, and packaging) vary by revision. Please consult the latest datasheet for precise specifications.

Pin count: 16 pins (SOIC-16 package). Function: Quad-channel digital isolator; four unidirectional data channels across a galvanic isolation barrier (input side to output side) with separate supply pins on each side.

Manufacturer: Silicon Labs (Silicon Laboratories), commonly known as Silicon Labs.
What kind of company: A US-based fabless semiconductor company that designs and markets mixed-signal ICs, including digital isolators, microcontrollers, wireless/IoT chips, and related analog products.

SI8421AB-C-IS is a multi-channel digital isolator used to provide galvanic isolation for high-noise/high-voltage environments. Key application areas include:
- Isolated interfaces between microcontrollers and high-voltage/power electronics
- Isolated data paths (SPI, I2C, UART) for controllers and peripherals
- Industrial automation and PLCs (sensors, actuators, I/O isolation)
- Motor control, servo drives, and inverters
- Power electronics front-ends (SMPS, UPS, solar inverters) requiring isolated control signals
- Measurement/instrumentation systems in harsh environments
It enables safe, reliable data transfer across isolation barriers in demanding industrial/energy applications.

I don’t have web access to verify that part number. Please paste the SI8421AB‑C‑IS datasheet or allow me to look it up and I’ll confirm the exact package type.