SI8421AB-C-IS

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SI8421AB-C-IS

DGTL ISOLTR 2.5KV 2CH GP 8-SOIC

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  • Mfr. Partie #SI8421AB-C-IS
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Spécifications

Part Status Not For New Designs
Base Product Number SI8421
Technology Capacitive Coupling
Type General Purpose
Isolated Power No
Number of Channels 2
Inputs - Side 1/Side 2 1/1
Channel Type Unidirectional
Voltage - Isolation 2500Vrms
Common Mode Transient Immunity (Min) 25kV/µs (Typ)
Data Rate 1Mbps
Propagation Delay tpLH / tpHL (Max) 35ns, 35ns
Pulse Width Distortion (Max) 25ns
Rise / Fall Time (Typ) 3.8ns, 2.8ns
Voltage - Supply 2.7V ~ 5.5V
Operating Temperature -40°C ~ 125°C
Mounting Type Surface Mount
Package 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-SOIC
Packaging Tube

Vue d'ensemble

Description

SI8421AB-C-IS is a dual-channel isolated gate driver. It provides galvanic isolation between a low-voltage control side (logic input) and a high-voltage, high-current output side used to drive power MOSFETs or IGBTs.
Key points:
- Two independent gate-drive channels to switch power devices in half-bridge/full-bridge circuits.
- High peak output current for fast gate charging/discharging, improving switching performance.
- On all channels: logic-compatible inputs (TTL/CMOS levels), and protections such as undervoltage lockout and fault reporting.
- Robust isolation up to reinforced isolation ratings (e.g., suitable for high common-mode transients) to keep the control circuitry safe from high-voltage side transients.
- The “-IS” suffix indicates the isolated version in an industrial/isolated package suitable for harsh environments (industrial temperature range).
Typical uses include motor drives, inverters, power supplies, solar inverters, and any application requiring safe, isolated driving of power switches.

Features

SI8421AB-C-IS is a dual-channel isolated digital isolator (iCoupler). Key features:
- Two independent channels for digital I/O isolation
- Reinforced isolation up to 5 kV RMS (safety-rated per IEC/UL1577)
- Separate VDD1 and VDD2 supplies (supports 3.3V or 5V logic on both sides)
- Data rate up to about 25 Mbps; typical propagation delay in the tens of ns
- Low channel-to-channel skew and good noise immunity
- High common-mode transient immunity (CM TI) for robust operation in noisy environments
- Wide operating temperature range: -40°C to +125°C
- RoHS-compliant, compact 8-pin package options (e.g., SOIC/MSOP)
- Safety and regulatory approvals (UL 1577, IEC 61010, etc.) typical of iCoupler devices
Note: exact figures (CM TI, delay, current, etc.) vary by package and variant; refer to the latest datasheet for precise specifications.

Package

It is an 8-pin SOIC (surface-mount) package.

Pinout

- Pin count: 8 pins (typical SOIC-8 package).
- Function: Dual-channel, unidirectional digital isolator (A→B). It transfers two logic signals across an isolation barrier with separate power rails on the input (A) and output (B) sides (Vcc1/GND1 and Vcc2/GND2). The “AB” in the part number denotes the direction (A to B).

Manufacturer

- Manufacturer: Silicon Labs (Silicon Laboratories, Inc.)
- What kind of company: A fabless semiconductor company that designs and markets mixed-signal ICs, microcontrollers, sensors, wireless solutions, and isolation devices (including digital isolators like the SI8421).

Application

Common application areas for SI8421AB-C-IS:
- Industrial automation and motor drives
- Power electronics, inverters, UPS, and renewable-energy systems
- Isolated sensor interfaces and isolated ADC/DAC front-ends
- Medical and safety-critical equipment
- Automotive and battery-management systems
- Test, measurement, and instrumentation equipment

Equivalent

Equivalent parts depend on required specs (channels, isolation rating, speed, packaging). For Si8421AB-C-IS (2-channel digital isolator), common cross references include:
- TI ISO7840/ISO7842 family
- Analog Devices ADuM1250/1251 (SPI isolators)
- Analog Devices ADuM5400/5401 (multi-channel isolators)
- Broadcom/Avago HCPL-7800/7802 series
- Renesas ISL8xxx/ISL9xxx digital isolators
Always verify isolation rating, logic levels, drive and pinout from datasheets.

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