SI8631ED-ASR Equivalent & Substitute Parts

Part Overview

The SI8631ED-ASR is a general purpose digital isolator manufactured by Skyworks Solutions Inc., designed for automotive applications with 5000Vrms isolation rating. This 3-channel capacitive coupling isolator operates at 150Mbps data rate with 60kV/µs common mode transient immunity and is packaged in 16-SOIC surface mount configuration. The part is active in production status and qualified to AEC-Q100 automotive standards. Substitute parts are identified when channel configuration, packaging format, or CMTI specifications differ while maintaining core isolation voltage and data rate performance.

Key Parameters

Parameter	SI8631ED-ASR
Manufacturer	Skyworks Solutions Inc.
Technology	Capacitive Coupling
Type	General Purpose
Number of Channels	3
Inputs - Side 1/Side 2	2/1
Voltage - Isolation	5000Vrms
Common Mode Transient Immunity (Min)	60kV/µs
Data Rate	150Mbps
Propagation Delay tpLH / tpHL (Max)	13ns / 13ns
Pulse Width Distortion (Max)	4.5ns
Voltage - Supply	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package / Case	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Packaging Format	Tape & Reel (TR)
Grade	Automotive
Qualification	AEC-Q100
Moisture Sensitivity Level (MSL)	2A (4 Weeks)

Substitute Part Grouping Explanation

Substitute parts for SI8631ED-ASR are identified based on the following criteria:

Primary Substitution Criteria:

Isolation voltage: 5000Vrms (maintained across all substitutes)
Data rate: 150Mbps (maintained across all substitutes)
Package type: 16-SOIC (0.295", 7.50mm Width) (maintained across all substitutes)
Supply voltage range: 2.5V ~ 5.5V (maintained across all substitutes)
Operating temperature: -40°C ~ 125°C (maintained across all substitutes)
Mounting type: Surface Mount (maintained across all substitutes)

Substitution Variations:

Channel configuration: SI8631ED-ASR features 3 channels (2 inputs on Side 1, 1 input on Side 2). Substitutes with 2-channel configurations (SI8620, SI8621, SI8622 series) are listed as alternatives for applications requiring fewer channels.
Common Mode Transient Immunity (CMTI): SI8631ED-ASR specifies 60kV/µs minimum CMTI. Substitute parts specify 35kV/µs minimum CMTI, representing a reduced performance specification.
Packaging format: SI8631ED-ASR is supplied in Tape & Reel (TR) format. Substitutes include both Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging options.
Input channel distribution: SI8621 and SI8622 series feature 1/1 input distribution (1 input on Side 1, 1 input on Side 2), while SI8620 series features 2/0 distribution (2 inputs on Side 1, 0 inputs on Side 2).

Parameter Comparison

Part Number	Channels	Inputs (Side 1/Side 2)	CMTI (Min)	Packaging	Inventory (Pcs)	Product Status
SI8631ED-ASR	3	2/1	60kV/µs	Tape & Reel (TR)	834	Active
SI8631ED-B-ISR	3	2/1	35kV/µs	Tape & Reel (TR)	25200	Active
SI8631BD-B-ISR	3	2/1	35kV/µs	Cut Tape (CT) & Digi-Reel®	9400	Active
SI8620ED-B-ISR	2	2/0	35kV/µs	Tape & Reel (TR)	18950	Active
SI8620BD-B-ISR	2	2/0	35kV/µs	Cut Tape (CT) & Digi-Reel®	22900	Active
SI8621ED-B-ISR	2	1/1	35kV/µs	Tape & Reel (TR)	15588	Active
SI8621BD-B-ISR	2	1/1	35kV/µs	Tape & Reel (TR)	4900	Active
SI8622BD-B-ISR	2	1/1	35kV/µs	Tape & Reel (TR)	15400	Active

Engineering Selection Recommendations

Direct Substitutes (Same Channel Configuration):

SI8631ED-B-ISR and SI8631BD-B-ISR maintain the 3-channel configuration with 2/1 input distribution identical to SI8631ED-ASR. Both parts are active in production status. SI8631ED-B-ISR is supplied in Tape & Reel format matching the original packaging specification. SI8631BD-B-ISR is supplied in Cut Tape & Digi-Reel® format. The primary difference is CMTI specification: both substitutes specify 35kV/µs minimum versus 60kV/µs for the original part. Both substitute parts carry RoHS3 compliance and REACH unaffected status.

Channel-Reduced Alternatives:

SI8620, SI8621, and SI8622 series parts provide 2-channel configurations suitable for applications requiring fewer isolation channels than the 3-channel SI8631ED-ASR. These parts maintain 5000Vrms isolation voltage, 150Mbps data rate, and identical package dimensions. SI8620 series (SI8620ED-B-ISR, SI8620BD-B-ISR) features 2/0 input distribution. SI8621 and SI8622 series (SI8621ED-B-ISR, SI8621BD-B-ISR, SI8622BD-B-ISR) feature 1/1 input distribution. All 2-channel alternatives specify 35kV/µs minimum CMTI.

Packaging Format Selection:

For Tape & Reel (TR) format requirements, select SI8631ED-B-ISR, SI8620ED-B-ISR, SI8621ED-B-ISR, or SI8622BD-B-ISR. For Cut Tape (CT) & Digi-Reel® format, select SI8631BD-B-ISR, SI8620BD-B-ISR, or SI8621BD-B-ISR.

All substitute parts are active in production status and carry AEC-Q100 automotive qualification equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can SI8631ED-B-ISR directly replace SI8631ED-ASR?

A: SI8631ED-B-ISR maintains identical channel configuration (3 channels, 2/1 input distribution), isolation voltage (5000Vrms), data rate (150Mbps), package type (16-SOIC), and supply voltage range (2.5V ~ 5.5V). The CMTI specification differs: SI8631ED-B-ISR specifies 35kV/µs minimum versus 60kV/µs for SI8631ED-ASR. Both parts are active in production and carry AEC-Q100 qualification. Packaging format is identical (Tape & Reel).

Q: What is the difference between SI8631ED-B-ISR and SI8631BD-B-ISR?

A: Both parts feature identical electrical specifications: 3 channels, 2/1 input distribution, 5000Vrms isolation, 150Mbps data rate, and 35kV/µs CMTI. The difference is packaging format: SI8631ED-B-ISR is supplied in Tape & Reel (TR) format, while SI8631BD-B-ISR is supplied in Cut Tape (CT) & Digi-Reel® format. Both are active in production status.

Q: Can I use a 2-channel part (SI8620, SI8621, SI8622) to replace the 3-channel SI8631ED-ASR?

A: 2-channel parts are suitable only for applications requiring fewer than 3 isolation channels. SI8620 series provides 2/0 input distribution. SI8621 and SI8622 series provide 1/1 input distribution. All maintain 5000Vrms isolation voltage, 150Mbps data rate, and 16-SOIC package dimensions. CMTI specification is 35kV/µs minimum for all 2-channel alternatives.

Q: What does the CMTI difference (60kV/µs vs. 35kV/µs) mean for my application?

A: Common Mode Transient Immunity (CMTI) specifies the maximum rate of change of common mode voltage that the isolator can tolerate without introducing errors. SI8631ED-ASR specifies 60kV/µs, while substitute parts specify 35kV/µs. Applications with slower common mode transient rates can use substitute parts. Applications requiring 60kV/µs CMTI performance must use SI8631ED-ASR or equivalent high-CMTI variants.

Q: Are all substitute parts AEC-Q100 qualified?

A: SI8631ED-ASR carries AEC-Q100 automotive qualification. Substitute parts SI8631ED-B-ISR and SI8631BD-B-ISR maintain identical automotive qualification. 2-channel alternatives (SI8620, SI8621, SI8622 series) are active in production status with RoHS3 compliance and REACH unaffected status. Verify specific automotive qualification requirements with component datasheets for 2-channel alternatives.

Q: What is the inventory status for substitute parts?

A: SI8631ED-ASR has 834 pcs in stock. SI8631ED-B-ISR has 25200 pcs available. SI8631BD-B-ISR has 9400 pcs available. 2-channel alternatives range from 4900 to 22900 pcs in stock. Inventory levels support high-volume production requirements.

Q: Do substitute parts have the same moisture sensitivity level?

A: SI8631ED-ASR specifies MSL 2A (4 Weeks). All substitute parts (SI8631ED-B-ISR, SI8631BD-B-ISR, SI8620 series, SI8621 series, SI8622 series) specify identical MSL 2A (4 Weeks) moisture sensitivity level.

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