Skyworks Solutions Inc. SI88620BD-ASR

Overview

SI88620BD-ASR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W peak output power and supporting 0–100 Mbps data rates with 18 ns typical propagation delay. It features reinforced isolation rated at 5000 VRMS, AEC-Q100 qualification, and operates across –40 to +125 °C for automotive and industrial power conversion and signal isolation.

For engineers reviewing the SI88620BD-ASR datasheet, SI88620BD-ASR pinout, SI88620BD-ASR application, or SI88620BD-ASR equivalent, this device enables compact isolated power + signal transfer in high-noise motor control, EV battery management, and PLC I/O modules - with external FET drive (ESW), programmable soft-start (SS), and frequency control (SH_FC) for EMI-sensitive designs.

Technical Context

The SI88620BD-ASR implements two unidirectional RF-based digital isolation channels using capacitive silicon dioxide barriers, with on-off keying modulation for superior noise immunity and magnetic field rejection. Its isolated DC-DC converter uses peak current mode control with secondary-side voltage sensing via VSNS and closed-loop feedback transmitted across the barrier.

This variant belongs to the Si8862x family configured for high-voltage-to-low-voltage operation (e.g., 24 V input to 3.3/5 V isolated output), requiring external NMOS switch (driven by ESW), current sense resistor (RSN), and transformer. It supports programmable switching frequency (200–800 kHz) and soft-start timing via external RC on SH_FC and SS pins.

Key Specifications

Pinout & Package

SI88620BD-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch) with creepage/clearance ≥8.3 mm for reinforced insulation compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel isolated DC-DC applications.

Compared with ADUM6210ARWZ and ISO7821FDWWR, SI88620BD-ASR uniquely combines 5 W isolated power delivery, 24 V input capability via ESW-driven external FET, and AEC-Q100 qualification - making it the only option among the three that satisfies high-power automotive and industrial isolated supply + signal requirements in a single SOIC-20 package.

Availability

SI88620BD-ASR is available at Aetrix Electronics and suitable for industrial motor drives, EV battery management systems, and renewable energy inverters requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.

Supply support for SI88620BD-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, timing, and isolation technologies for wireless, automotive, and industrial markets.

The Si8862x product line is designed specifically for high-reliability isolated power + signal transfer in automotive and industrial applications where 24 V primary-side operation, AEC-Q100 compliance, and programmable DC-DC control are mandatory.

FAQ

What is the maximum isolated output power of the SI88620BD-ASR?

The SI88620BD-ASR supports up to 5 W peak isolated output power when used with an external NMOS switch driven by the ESW pin and appropriate transformer (e.g., UMEC UTB02250s). Average continuous output is 2 W at 5 V, sufficient to power isolated microcontrollers, gate drivers, and analog circuitry without auxiliary supplies.

Does the SI88620BD-ASR require external components for DC-DC operation?

Yes, the SI88620BD-ASR requires external components for DC-DC operation: an external NMOS transistor (driven by ESW), current sense resistor (RSN), transformer (e.g., Coilcraft TA7618-AL), rectifying diode, output capacitor, and compensation network (RCOMP + CCOMP on COMP pin). These enable its high-voltage-to-low-voltage conversion capability.

What isolation certifications does the SI88620BD-ASR hold?

The SI88620BD-ASR is certified to UL 1577 (5000 VRMS, 1 min), CSA 62368-1 (reinforced insulation), VDE 62368-1, and CQC GB4943.1. It also meets VDE 60747-17 basic insulation (pending) and carries AEC-Q100 Grade 1 qualification for automotive use.

Can the SI88620BD-ASR operate with a 24 V input supply?

Yes, the SI88620BD-ASR is specifically designed for high-voltage-to-low-voltage configurations, including 24 V input to 3.3 V or 5 V isolated output. This is achieved using the ESW pin to drive an external NMOS switch and the RSN pin for primary-side current sensing - per Figure 9 in the datasheet.

How does the soft-start function work on the SI88620BD-ASR?

The SI88620BD-ASR implements programmable soft-start via an external capacitor connected to the SS pin. This capacitor controls the internal timer that ramps up DC-DC output voltage gradually, limiting inrush current into downstream loads and preventing system-level brownouts during power-up sequences.