SI8261BBC-ASR

SI8261BBC-ASR is Silicon Labs’ isolated digital interface device (digital isolator) in an 8-pin BBC package. It provides galvanic isolation between a microcontroller-side (A-side) and a separate domain (B-side) to protect the microcontroller from high voltage and noise.
Key points
- Two isolated data channels with a host interface (SPI-like) to the MCU
- Independent supply rails for each side (3.3V/5V logic common)
- High isolation voltage (typical up to several kV RMS, suitable for safety-critical applications)
- Low propagation delay and good common-mode transient immunity
- Wide operating temperature range (typical for industrial parts)
- Packaging code BBC; ASR denotes specific packaging/reel options
Typical applications
- Motor drives, inverters, and other power/electronics isolated I/O
- Industrial automation and PLCs
- Medical equipment requiring electrical isolation
Note: ASR suffix indicates packaging/reel option; always verify exact electrical specs (isolation rating, data rate, and side definitions) in the current datasheet for SI8261BBC-ASR.

8-pin surface-mount SOIC (SOP-8) package.

- Pin count: 8 pins (8-pin package, e.g., SOIC-8)
- Function: Single-channel isolated digital isolator; provides galvanic isolation between two sides with separate supply pins, transferring a logic signal across the isolation barrier (logic-compatible interface).

- Manufacturer: Silicon Labs (Silicon Laboratories, Inc.)
- What kind of company: A US-based fabless semiconductor company that designs and sells ICs for embedded systems (including isolation, wireless, sensors, and related products).

Applications of SI8261BBC-ASR include:
- Isolated gate drive for MOSFETs/IGBTs in motor drives, inverters, and switch‑mode power supplies
- Isolated signaling between HV and LV domains in industrial automation and PLCs
- HV sensing and measurement interfaces
- Battery management systems (BMS) for energy storage
- Solar inverters and uninterruptible power supplies (UPS)
- General galvanic-isolation needs between control electronics and high‑voltage/high‑power sections

There isn’t an exact one‑to‑one cross for SI8261BBC-ASR. Closest options are:
- Silicon Labs Si826x family (e.g., Si8260, Si8262, Si8263) for similar isolation-logic/driving functions.
- Other vendors’ isolated-gate/driver devices such as Broadcom HCPL series, Analog Devices iCoupler ADuM1250/1251, or TI ISO families, depending on required voltage, channels, and package.
For a precise cross, use Digi-Key/Mouser cross-reference with your specs (isolation voltage, channels, package).