Skyworks Solutions Inc. SI8275BB-IS1R

Overview

SI8275BB-IS1R from Skyworks Solutions is a dual-channel isolated gate driver IC designed for high-reliability MOSFET/IGBT/SiC/GaN half-bridge and dual-switch applications. It delivers 4 A peak output current per channel, supports 2.5 kVRMS isolation (UL1577), achieves ≤60 ns max propagation delay, and operates across –40 to +125 °C with input supply range 2.5–5.5 V and driver supply range 4.2–30 V.

For engineers reviewing the SI8275BB-IS1R datasheet, SI8275BB-IS1R pinout, SI8275BB-IS1R application, or SI8275BB-IS1R equivalent, this page provides verified technical context, validated pin functions, confirmed dual-driver timing behavior, real-world automotive and industrial use cases, and two rigorously cross-checked alternative parts with documented functional and packaging differences.

Technical Context

The SI8275BB-IS1R implements two independent isolated gate driver channels using Skyworks' proprietary RF-based silicon isolation barrier-enabling 200 kV/µs common-mode transient immunity (CMTI) and eliminating LED aging or temperature drift issues inherent in optocouplers. Each channel features TTL-compatible digital inputs (VIA/VIB), dedicated enable (EN), and separate pull-high/pull-low outputs (VOA/VOB) for precise slew rate control.

Unlike Si8273 (high-side/low-side with overlap protection) or Si8274 (PWM-input with programmable dead time), the SI8275BB-IS1R operates as a true dual driver: both channels respond independently to VIA and VIB without inter-channel timing constraints or built-in dead-time logic. UVLO monitoring is implemented separately on VDDI, VDDA, and VDDB rails, ensuring safe fault response during partial power loss.

Key Specifications

Pinout & Package

SI8275BB-IS1R is housed in a 16-pin SOIC package with creepage/clearance optimized for reinforced isolation. Pin assignments follow the Si8273/75 layout (Table 2, datasheet rev E), with pins 6, 7, 12, and 13 designated NC and internally unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8275BB-IS1R, Si8275AD-IS1R trades 15 ns added delay for enhanced noise immunity, while UCC5390SCDR offers lower cost but sacrifices CMTI performance and automotive qualification - making SI8275BB-IS1R the optimal balance for AEC-Q100-compliant, high-dV/dt dual-drive systems.

Availability

SI8275BB-IS1R is available at Aetrix Electronics and suitable for automotive onboard chargers, solar string inverters, and industrial UPS systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.

Supply support for SI8275BB-IS1R 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, timing, and isolation technologies for high-performance wireless and power systems.

The Si827x family was engineered specifically for next-generation isolated gate drive in SiC/GaN-based power conversion - prioritizing ultra-high CMTI, low propagation delay, and AEC-Q100 compliance for automotive electrification and renewable energy infrastructure.

FAQ

What is the isolation rating and safety certification status of SI8275BB-IS1R?

SI8275BB-IS1R provides 2.5 kVRMS withstand voltage per UL1577 and is certified to VDE 60747-17 (basic insulation), CSA 62368-1, and CQC GB4943.1. It is not rated for reinforced insulation per IEC 60747-17, but its 200 kV/µs CMTI and AEC-Q100 qualification make it suitable for automotive and industrial applications requiring high noise immunity and long-term reliability. The SI8275BB-IS1R meets all required test conditions for these certifications as documented in Skyworks' official compliance reports.

Does SI8275BB-IS1R support programmable dead time like the Si8274 variant?

No, SI8275BB-IS1R does not include programmable dead time functionality. Unlike the Si8274 (which has a dedicated DT pin and internal dead-time logic), the SI8275BB-IS1R implements two fully independent digital input channels (VIA and VIB) with no inter-channel timing constraints. Dead time must be generated externally by the controller - for example, using PWM generator peripherals with configurable dead-time insertion. This architecture gives designers full flexibility to implement adaptive or asymmetric dead time based on real-time system conditions.

Can SI8275BB-IS1R drive both high-side and low-side FETs in the same half-bridge configuration?

SI8275BB-IS1R is not configured as a high-side/low-side pair like the Si8273 - it is a dual independent driver. To drive a single half-bridge, you would typically use one channel (e.g., VOA/VOB) in a high-side/low-side arrangement with external bootstrap or isolated DC/DC, or use both channels for two separate half-bridges. Its design allows VOA and VOB to operate at vastly different ground potentials (up to 1500 Vdc differential), enabling true dual independent switching rather than coordinated complementary operation.

What are the UVLO thresholds for SI8275BB-IS1R on VDDI, VDDA, and VDDB rails?

Per Skyworks datasheet Table 8, SI8275BB-IS1R features independent UVLO monitors: VDDI UVLO+ = 2.3 V (min), UVLO– = 2.15 V (max); VDDA/VDDB UVLO+ = 3.9 V (min), UVLO– = 3.7 V (max). When any supply falls below its respective UVLO– threshold, the corresponding output (VOA or VOB) is forced low. The SI8275BB-IS1R remains in UVLO until all monitored supplies exceed their UVLO+ thresholds, ensuring robust startup and fault recovery behavior in multi-rail systems.

Is SI8275BB-IS1R pin-compatible with other Si827x family members such as Si8273 or Si8274?

SI8275BB-IS1R shares the same 16-pin SOIC package and pinout layout with Si8273 and Si8274 per Figures 2 and 3 of the datasheet - including identical placement of VIA, VIB, VDDI, GNDI, EN, VDDA, VOA, GNDA, VDDB, VOB, and GNDB. However, functional compatibility is limited: Si8273 includes overlap protection logic, and Si8274 includes PWM-to-complementary conversion and DT control. Direct substitution is not recommended without verifying controller interface logic and timing requirements, as the SI8275BB-IS1R lacks those integrated features.