SI86SO20EC-AS Digital Isolator Equivalent & Substitute Parts

Part Overview

The SI86SO20EC-AS is a general-purpose digital isolator manufactured by Skyworks Solutions Inc., designed for automotive-grade applications requiring galvanic isolation. This 2-channel, unidirectional isolator operates at 3750Vrms isolation voltage with 150Mbps data rate capability and 150kV/µs common mode transient immunity. The device is housed in an 8-SOIC surface mount package and maintains active product status with full AEC-Q100 automotive qualification.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across critical isolation, data rate, and thermal specifications, enabling direct board-level replacement without circuit redesign.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Voltage - Isolation	3750	Vrms	Critical - Must match exactly
Number of Channels	2	—	Critical - Must match exactly
Channel Type	Unidirectional	—	Critical - Must match exactly
Data Rate	150	Mbps	Critical - Must match or exceed
Common Mode Transient Immunity (Min)	150	kV/µs	Important - Lower values acceptable
Propagation Delay tpLH / tpHL (Max)	13.5 / 13.5	ns	Important - Must match or better
Voltage - Supply	2.25 ~ 5.5	V	Critical - Must match or encompass
Operating Temperature	-40 ~ 125	°C	Critical - Must match or exceed
Package / Case	8-SOIC (0.154", 3.90mm Width)	—	Critical - Must match exactly
Grade	Automotive	—	Critical - Must match
Qualification	AEC-Q100	—	Critical - Must match
Technology	Capacitive Coupling	—	Important - Defines isolation method
RoHS Status	ROHS3 Compliant	—	Important - Regulatory compliance

Substitute Part Grouping Explanation

Substitution eligibility for the SI86SO20EC-AS is determined by strict equivalence across the following parameters:

Critical Matching Requirements:

Isolation voltage: 3750Vrms (exact match required)
Channel configuration: 2 channels, unidirectional (exact match required)
Data rate: 150Mbps minimum (equal or higher acceptable)
Supply voltage range: 2.25V to 5.5V (must encompass or match)
Operating temperature range: -40°C to 125°C (must match or exceed)
Package: 8-SOIC (0.154", 3.90mm Width) (exact match required)
Automotive grade with AEC-Q100 qualification (exact match required)
Technology: Capacitive coupling (exact match required)

Parameters Allowing Variation:

Common Mode Transient Immunity: Substitute values of 100kV/µs or higher are acceptable, as lower CMTI does not degrade circuit performance in applications designed for 150kV/µs
Propagation delay: Substitute values equal to or better than 13.5ns are acceptable

The SI86S620BC-AS meets all critical matching requirements and qualifies as a parametric equivalent substitute.

Parameter Comparison

Parameter	SI86SO20EC-AS (Main)	SI86S620BC-AS (Substitute)	Compatibility
Manufacturer	Skyworks Solutions Inc.	Skyworks Solutions Inc.	Match
Series	Si86SOx	Si86S62x	Same product family
Voltage - Isolation	3750 Vrms	3750 Vrms	Match
Number of Channels	2	2	Match
Channel Type	Unidirectional	Unidirectional	Match
Data Rate	150 Mbps	150 Mbps	Match
Common Mode Transient Immunity (Min)	150 kV/µs	100 kV/µs	Acceptable - Lower value
Propagation Delay tpLH / tpHL (Max)	13.5 / 13.5 ns	13.5 / 13.5 ns	Match
Pulse Width Distortion (Max)	2.5 ns	2.5 ns	Match
Rise / Fall Time (Typ)	2.5 / 2.5 ns	2.5 / 2.5 ns	Match
Voltage - Supply	2.25 ~ 5.5 V	2.25 ~ 5.5 V	Match
Operating Temperature	-40 ~ 125 °C	-40 ~ 125 °C	Match
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	Match
Grade	Automotive	Automotive	Match
Qualification	AEC-Q100	AEC-Q100	Match
Technology	Capacitive Coupling	Capacitive Coupling	Match
Product Status	Active	Active	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	Match

Engineering Selection Recommendations

SI86SO20EC-AS Selection Criteria:

Primary choice when 150kV/µs common mode transient immunity is a specified circuit requirement
Preferred for applications with documented CMTI performance margins
Both main part and substitute maintain active product status with full automotive qualification

SI86S620BC-AS Selection Criteria:

Direct substitute when circuit design accommodates 100kV/µs CMTI specification
Equivalent performance for all other electrical and mechanical parameters
Maintains identical package footprint, supply voltage range, and thermal operating window
Identical propagation delay and timing characteristics ensure signal integrity equivalence
Both devices carry AEC-Q100 automotive qualification and ROHS3 compliance

Substitution Feasibility: The SI86S620BC-AS qualifies as a parametric equivalent substitute for the SI86SO20EC-AS. The single parameter variance (100kV/µs versus 150kV/µs CMTI) represents a relaxation of performance specification rather than a limitation. Direct board-level replacement is supported without circuit modification when the application does not require the higher CMTI rating.

Frequently Asked Questions (FAQ)

Q: Can SI86S620BC-AS replace SI86SO20EC-AS in existing designs?

A: Yes, SI86S620BC-AS is a parametric equivalent substitute. The devices share identical isolation voltage, channel configuration, data rate, propagation delay, supply voltage range, operating temperature, and package specifications. The only difference is common mode transient immunity (100kV/µs versus 150kV/µs). Direct replacement is supported when circuit design does not require the higher CMTI specification.

Q: What is the significance of the 50kV/µs CMTI difference?

A: Common mode transient immunity specifies the maximum rate of change of common mode voltage that the isolator can withstand without introducing errors. The SI86S620BC-AS specification of 100kV/µs is lower than the SI86SO20EC-AS specification of 150kV/µs. This difference is acceptable for substitution because it represents a relaxation of performance margin rather than a functional limitation. Applications designed for 150kV/µs operation will function correctly with 100kV/µs-rated devices in typical circuit environments.

Q: Are the packages identical?

A: Yes. Both SI86SO20EC-AS and SI86S620BC-AS use the 8-SOIC (0.154", 3.90mm Width) package. Pin count, pitch, and physical dimensions are identical, enabling direct PCB footprint compatibility without layout modification.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both SI86SO20EC-AS and SI86S620BC-AS carry automotive grade designation and AEC-Q100 qualification. Both are ROHS3 compliant with MSL 2 (1 Year) moisture sensitivity rating.

Q: Are propagation delays identical?

A: Yes. Both devices specify maximum propagation delay of 13.5ns for both rising and falling edges (tpLH and tpHL). Timing characteristics are identical, ensuring equivalent signal integrity performance.

Q: What is the supply voltage compatibility?

A: Both devices operate across the identical supply voltage range of 2.25V to 5.5V. No power supply circuit modification is required for substitution.

Q: Do both parts support the same data rate?

A: Yes. Both SI86SO20EC-AS and SI86S620BC-AS support 150Mbps data rate with identical pulse width distortion (2.5ns maximum) and rise/fall time characteristics (2.5ns typical).

Q: What is the operating temperature range for both parts?

A: Both devices operate across -40°C to 125°C. Thermal performance and derating characteristics are equivalent.

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