SI8440AB-C-IS1 Equivalent & Substitute Parts

Part Overview

The SI8440AB-C-IS1 is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 2500Vrms isolation voltage across 4 channels with 1Mbps data rate and 25kV/µs common mode transient immunity. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing system support, maintenance, and legacy design continuity where new component selection is not feasible.

Substiute Parts

SI8440AB-C-IS1

Skyworks Solutions Inc.In Stock: 1102SI8440AB-C-IS1 Datasheet

Current PartRFQ

SI8430AB-D-IS1

Skyworks Solutions Inc.In Stock: 1829SI8430AB-D-IS1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8440AB-C-IS1 is determined by the following critical parameters:

• Isolation Voltage: Must be 2500Vrms or higher
• Technology: Capacitive coupling architecture
• Package: 16-SOIC form factor with identical pin pitch and dimensions
• Supply Voltage Range: 2.7V ~ 5.5V compatibility
• Operating Temperature Range: -40°C ~ 125°C minimum
• Data Rate: 1Mbps minimum performance
• Common Mode Transient Immunity: 25kV/µs or greater

The SI8430AB-D-IS1 qualifies as a parametric equivalent based on these criteria. The primary difference is channel count (3 channels versus 4 channels), which represents a functional reduction rather than a performance degradation in isolation, timing, or electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SI8430AB-D-IS1 is a valid substitute for the SI8440AB-C-IS1 in applications where only three isolation channels are required. Both devices share identical electrical performance characteristics, isolation voltage ratings, timing specifications, and package geometry. The SI8430AB-D-IS1 carries ROHS3 compliance and REACH unaffected status, providing additional regulatory alignment for new production environments.

Selection between these parts depends solely on circuit requirements for channel count. If the application design utilizes all four channels of the SI8440AB-C-IS1, the SI8430AB-D-IS1 cannot serve as a direct replacement without circuit modification. Conversely, if only three channels are active or required, the SI8430AB-D-IS1 provides equivalent isolation, timing, and thermal performance with superior compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can the SI8430AB-D-IS1 replace the SI8440AB-C-IS1 in all applications?

A: No. The SI8430AB-D-IS1 has three isolation channels compared to four in the SI8440AB-C-IS1. Substitution is valid only if the circuit design requires three or fewer isolated channels. Applications utilizing all four channels require the four-channel variant or circuit redesign.

Q: Are the isolation voltage and timing specifications identical?

A: Yes. Both devices provide 2500Vrms isolation voltage, 25kV/µs common mode transient immunity, 1Mbps data rate, and identical propagation delay and pulse width distortion specifications. Electrical performance is equivalent.

Q: Is the package footprint identical?

A: Yes. Both parts use the 16-SOIC (0.154", 3.90mm Width) package with identical pin pitch and dimensions. PCB layout and footprint files require no modification.

Q: What is the difference in compliance status?

A: The SI8430AB-D-IS1 carries explicit ROHS3 compliance and REACH unaffected certifications. The SI8440AB-C-IS1 product status is "Not For New Designs." For new production or regulated environments, the SI8430AB-D-IS1 offers superior compliance documentation.

Q: Can I use the SI8430AB-D-IS1 if my design only uses two channels?

A: Yes. The SI8430AB-D-IS1 provides three channels, so applications requiring two or fewer channels can utilize this substitute without functional limitation.

Q: Are supply voltage and operating temperature ranges the same?

A: Yes. Both devices operate across 2.7V to 5.5V supply voltage and -40°C to 125°C temperature range with identical MSL rating of 2 (1 Year).