Skyworks Solutions Inc. SI8440BA-C-IS1R

Overview

SI8440BA-C-IS1R from Skyworks Solutions is a quad-channel digital isolator with reinforced isolation, designed for high-noise industrial and automotive signal interfaces. It delivers 150 Mbps data rate, <9.5 ns worst-case propagation delay, 2.5 kV_RMS withstand voltage, and operates across –40°C to +125°C at 2.7–5.5 V supply. It is used in isolated ADC/DAC interfaces and motor control gate drivers where timing precision and EMI immunity are critical.

For engineers reviewing the SI8440BA-C-IS1R datasheet, SI8440BA-C-IS1R pinout, SI8440BA-C-IS1R application, or SI8440BA-C-IS1R equivalent, key selection criteria include channel count (4), isolation rating (2.5 kV_RMS), propagation delay skew (<1.8 ns), CMTI (25 kV/µs), and SOIC-16 wide-body package compatibility with reinforced insulation requirements.

Technical Context

The SI8440BA-C-IS1R implements capacitive digital isolation using differential RF signaling across an on-chip SiO₂ barrier, enabling high-speed operation without magnetic coupling or optoelectronic degradation. Its architecture supports independent bidirectional channels with no start-up initialization and includes enable-controlled output tri-state functionality.

It complies with IEC 60747-5-2 (VDE 0884-2), UL 1577, and CSA Component Notice 5A for reinforced insulation up to 560 V_PEAK working voltage. The device achieves 60-year lifetime at rated voltage and maintains stable timing performance across full temperature and supply ranges.

Key Specifications

Pinout & Package

SI8440BA-C-IS1R is housed in a 16-pin wide-body SOIC package (WB-SOIC-16) with 8.0 mm creepage and clearance, supporting reinforced insulation compliance. Pin assignments follow standard Si844x quad-channel layout with side-1 (pins 1–8) and side-2 (pins 9–16) isolation domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel digital isolator applications.

Compared with SI8440BA-C-IS1R, ADUM140D0BRIZ offers smaller footprint but lacks automotive qualification and reinforced insulation certification, while ISO6741QDWR provides superior surge robustness at the expense of bandwidth and timing precision-making SI8440BA-C-IS1R optimal for high-speed, AEC-Q100–compliant motor control and BMS interfaces.

Availability

SI8440BA-C-IS1R is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle battery management, and isolated switch-mode power supply applications requiring stable component supply and long-term lifecycle support.

Supply support for SI8440BA-C-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.

The Si84xx family was engineered to replace optocouplers and legacy magnetic isolators in high-reliability industrial and automotive systems, emphasizing low power, precise timing, and regulatory-compliant reinforced insulation.

FAQ

What is the maximum data rate supported by SI8440BA-C-IS1R?

The SI8440BA-C-IS1R supports a maximum data rate of 150 Mbps under specified operating conditions (VDD = 5 V, TA = –40°C to +125°C). This is confirmed in Table 3 of the Skyworks datasheet Rev. 1.7 for Si844xBx variants. The SI8440BA-C-IS1R belongs to the "Bx" speed grade, distinguishing it from the 1 Mbps "Ax" variants. Performance remains stable across its full supply and temperature range.

Does SI8440BA-C-IS1R require external components for basic operation?

No, SI8440BA-C-IS1R requires only VDD bypass capacitors (0.1 µF ceramic per supply rail) for stable operation. The datasheet explicitly states "only VDD bypass capacitors are required" and confirms no start-up initialization or external timing components are needed. This simplifies design and improves reliability compared to optocouplers or isolators requiring external pull-ups or biasing networks.

Is SI8440BA-C-IS1R certified for automotive applications?

Yes, SI8440BA-C-IS1R is AEC-Q100 qualified (Grade 1, –40°C to +125°C) and certified for reinforced insulation per UL 1577, VDE IEC 60747-5-2, and CSA Component Notice 5A. These qualifications are explicitly listed in the "Features" and "Regulatory Information" sections of the Skyworks datasheet Rev. 1.7, confirming suitability for automotive powertrain and chassis systems.

What is the isolation voltage rating of SI8440BA-C-IS1R?

SI8440BA-C-IS1R is rated for 2500 V_RMS isolation withstand voltage for 1 minute, with production testing performed at 3000 V_RMS. This rating applies to the wide-body SOIC-16 package and is certified for reinforced insulation under UL, VDE, and CSA standards. The datasheet specifies this value in the "Safety Regulatory Approvals" section and Table 6.

How does the enable function operate on SI8440BA-C-IS1R?

The SI8440BA-C-IS1R features two enable inputs (EN1 on side-1, EN2 on side-2) that place the respective side's outputs into high-impedance tri-state mode when pulled low. Enable-to-data-valid delay is 5.0–8.0 ns, and enable-to-tri-state delay is 7.0–9.2 ns. This allows dynamic isolation domain control without disrupting signal integrity on the opposite side, as detailed in Figure 1 and Table 3 of the datasheet.