Skyworks Solutions Inc. SI8271DB-IS

Overview

SI8271DB-IS from Skyworks Solutions is a single-channel isolated gate driver IC designed for high-reliability MOSFET/IGBT/SiC/GaN power switch control in high-noise, high-dV/dt environments. It delivers 4 A peak output current, 60 ns max propagation delay, 200 kV/µs common-mode transient immunity (CMTI), and operates across –40 to +125 °C with 2.5–5.5 V input supply and 4.2–30 V driver supply. It is widely deployed in solar inverters and motor drives requiring robust isolation and precise timing.

For engineers reviewing the SI8271DB-IS datasheet, SI8271DB-IS pinout, SI8271DB-IS application, or SI8271DB-IS equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world application mappings, and two rigorously cross-checked alternative parts - all aligned to Skyworks' official Si827x family documentation and safety-certified specifications.

Technical Context

The SI8271DB-IS implements a single-channel RF-based isolation architecture with a semiconductor die-to-die barrier, enabling 2.5 kVRMS withstand voltage per UL1577 and eliminating LED aging and temperature drift inherent in optocouplers. Its TTL-compatible input features >400 mV hysteresis and supports individual digital control via VI pin.

It integrates independent UVLO monitoring on both input (VDDI) and output (VDD) sides, forces VO+ and VO− into high-impedance or low states during fault conditions, and includes a dedicated EN pin that unconditionally pulls outputs low within tSD when asserted. The driver supports separate pull-up/pull-down outputs for slew rate control and operates without initialization or configuration.

Key Specifications

Pinout & Package

SI8271DB-IS is housed in an 8-pin SOIC package with wide creepage/clearance for reinforced isolation. Pin assignments are validated per Skyworks' official Si8271 pinout diagram and Table 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si8271AD-IS, SI8271DB-IS provides lower propagation delay and no deglitch-induced latency; compared with UCC5390SCD, it delivers superior noise immunity, automotive qualification, and dual-sided UVLO - making it optimal for safety-critical, high-reliability power systems.

Availability

SI8271DB-IS is available at Aetrix Electronics and suitable for solar power inverters, traction motor drives, and onboard chargers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for SI8271DB-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, isolation, and precision timing technologies.

The Si827x product line was engineered specifically for high-reliability isolated gate driving in power conversion systems - targeting automotive traction inverters, renewable energy inverters, and industrial motor drives demanding best-in-class CMTI and lifetime stability.

FAQ

What is the maximum operating temperature range for the SI8271DB-IS?

The SI8271DB-IS is rated for continuous operation from –40 °C to +125 °C ambient temperature. This range is validated per AEC-Q100 Grade 1 requirements and supports deployment in under-hood automotive applications and industrial enclosures without forced cooling. The device's silicon isolation technology maintains timing stability and CMTI performance across this full range, unlike optocouplers whose CTR degrades above 85 °C. SI8271DB-IS thermal design must ensure junction temperature remains ≤150 °C under worst-case load and ambient conditions.

Does the SI8271DB-IS support both high-side and low-side gate driving configurations?

Yes, the SI8271DB-IS supports both high-side and low-side gate driving via its separate VO+ (pull-high) and VO− (pull-low) outputs. When used in a half-bridge, VO+ drives the gate of the high-side switch (e.g., via bootstrap or isolated supply), while VO− sinks current from the low-side switch gate. The outputs are fully isolated from the input side (VI, VDDI, GNDI), enabling direct connection to floating high-side nodes up to 1500 V DC. No external level shifters or transformers are needed - the isolation barrier handles the potential difference inherently.

What safety certifications does the SI8271DB-IS hold?

The SI8271DB-IS carries UL recognition per UL1577 (2500 VRMS for one minute), CSA certification to 62368-1 (basic insulation), VDE conformity to 60747-17 (basic insulation), and CQC approval to GB4943.1 (basic insulation). All certifications apply to the 8-pin SOIC package variant and validate reinforced insulation capability. These approvals support compliance with IEC 62368-1, IEC 60747-5-5, and regional safety standards for industrial and automotive end equipment - including onboard chargers and solar inverters requiring double insulation.

How does the EN (enable) pin function on the SI8271DB-IS?

The EN pin on the SI8271DB-IS is an active-high enable input that unconditionally forces both VO+ and VO− into a low-output state when pulled low, regardless of the VI input state or power supply conditions. Device operation resumes within tRESTART (typically <1 µs) after EN returns high, provided VDDI and VDD are above their respective UVLO thresholds. If VDDI is below UVLO, EN has no effect - outputs remain in their default safe state. This behavior enables fail-safe system-level shutdown in fault conditions such as overtemperature or overvoltage detection.

What is the purpose of separate VO+ and VO− outputs on the SI8271DB-IS?

The separate VO+ and VO− outputs on the SI8271DB-IS allow independent gate resistor placement to optimize turn-on (via VO+) and turn-off (via VO−) slew rates - critical for minimizing switching losses and EMI in SiC and GaN power stages. Unlike single-output drivers, this architecture avoids compromise between rise/fall time control and enables asymmetric gate drive tuning. For example, a smaller resistor on VO+ speeds up turn-on for reduced conduction loss, while a larger resistor on VO− slows turn-off to limit dv/dt stress on the power device and bus capacitance.