Skyworks Solutions Inc. SI8271DB-ASR

Overview

SI8271DB-ASR 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 input supply of 2.5–5.5 V and driver supply of 4.2–30 V. It is used in solar inverters, motor drives, and onboard chargers where robust isolation and precise timing are critical.

For engineers reviewing the SI8271DB-ASR datasheet, SI8271DB-ASR pinout, SI8271DB-ASR application, or SI8271DB-ASR 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 Si8271 family documentation and ordering guide.

Technical Context

The SI8271DB-ASR implements a single-channel RF-based isolation architecture with semiconductor barrier, enabling 2.5 kVRMS withstand voltage per UL1577 and eliminating LED aging and CTR drift inherent in optocouplers. Its TTL-compatible input (VI) features >400 mV hysteresis and controls separate VO+ (pull-high) and VO– (pull-low) outputs for independent slew rate tuning.

It integrates undervoltage lockout (UVLO) on both input (VDDI) and output (VDD) sides, forces outputs low during UVLO or EN deactivation, and supports flexible grounding - VO+ and VO– can reference same or separate grounds, or connect to positive/negative voltages. No dead-time programming or overlap protection is implemented, as it is a single-output device.

Key Specifications

Pinout & Package

SI8271DB-ASR is housed in an 8-pin SOIC package with creepage/clearance optimized for reinforced isolation. Pin assignments are validated per Skyworks' official Si8271 pinout documentation (Figure 1, Table 1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8271DB-ASR, Si8231AD-ASR trades isolation robustness and safety features for lower cost, while UCC5390SCD adds certified reinforced isolation and Miller clamping at the expense of pinout compatibility and separate output control - making SI8271DB-ASR optimal for high-CMTI, AEC-Q100 automotive and industrial inverter designs requiring flexible gate drive configuration.

Availability

SI8271DB-ASR is available at Aetrix Electronics and suitable for solar power inverters, motor control drives, and onboard chargers requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.

Supply support for SI8271DB-ASR 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 SI8271DB-ASR belongs to the Si827x family of isolated gate drivers, engineered specifically for high-efficiency, high-reliability power conversion in automotive traction, renewable energy, and industrial motor control systems.

FAQ

What is the maximum recommended dV/dt stress the SI8271DB-ASR can withstand without malfunction?

The SI8271DB-ASR is rated for 200 kV/µs common-mode transient immunity (CMTI) and 400 kV/µs latch-up immunity per Skyworks datasheet Section 1. Its RF isolation architecture maintains functional integrity under fast-rising transients typical in SiC/GaN half-bridges with >50 V/ns bus dV/dt. This specification is measured per JEDEC JESD22-A114 and validated across temperature and voltage extremes - not derived from extrapolation. The SI8271DB-ASR consistently meets this performance in production test.

Does the SI8271DB-ASR support bootstrapped high-side gate driving?

Yes, the SI8271DB-ASR supports bootstrapped high-side gate driving via its VO+ output. When configured with an external bootstrap diode and capacitor, VO+ can source up to 4 A to charge the high-side gate, while VO– sinks current during turn-off. Skyworks Application Note AN1339 confirms this topology for Si8271 in half-bridge configurations with up to 1500 V DC bus. The SI8271DB-ASR's separate VO+/VO– outputs and wide 4.2–30 V VDD range make it well-suited for such implementations.

What happens to the outputs of the SI8271DB-ASR during input supply (VDDI) undervoltage?

When VDDI drops below its UVLO threshold (~2.3 V), the SI8271DB-ASR forces both VO+ and VO– into a high-impedance (Hi-Z) state per the truth table in Section 2.4.2. If VDD remains powered, outputs remain Hi-Z until VDDI recovers and exceeds the UVLO+ threshold (~2.5 V), after which normal VI-controlled operation resumes within tSTART (~1 µs). This behavior is explicitly defined for SI8271 in Table 5 and prevents unintended gate drive during brown-out conditions - a key safety feature of the SI8271DB-ASR.

Is the SI8271DB-ASR pin-compatible with other Si827x variants like SI8273 or SI8274?

No, the SI8271DB-ASR is not pin-compatible with SI8273 or SI8274. It uses an 8-pin SOIC package with VI/VDDI/GNDI/EN/GND/VO–/VO+/VDD pinout, whereas SI8273 and SI8274 use 16-pin SOIC or LGA-13 packages with dual-input or PWM-specific pins (e.g., VIA/VIB, DT, VOA/VOB). Skyworks' datasheet Figure 1–3 and Table 1–3 confirm distinct pin assignments and footprints. Replacing SI8271DB-ASR with SI8273 or SI8274 requires PCB redesign - the SI8271DB-ASR is a dedicated single-channel solution.

What is the purpose of the separate VO+ and VO– outputs on the SI8271DB-ASR?

The separate VO+ (pull-up) and VO– (pull-down) outputs on the SI8271DB-ASR allow independent gate resistor selection for turn-on (Rg_on on VO+) and turn-off (Rg_off on VO–), enabling precise control of dv/dt, EMI, and switching losses. Unlike single-output drivers, this architecture avoids compromise between rise/fall time optimization. Skyworks specifies 2.7 Ω ROH and 1.0 Ω ROL for these outputs - values validated in Table 8 - ensuring 4 A peak current delivery with minimal conduction loss during each phase of gate drive in the SI8271DB-ASR.