IS126 Optoisolator Transistor Output Equivalent & Substitute Parts

Part Overview

The IS126 is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This surface mount component provides galvanic isolation at 3750Vrms with a single channel configuration, supporting both AC and DC input types. The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance, isolation voltage, output characteristics, and package compatibility are maintained across the specified parameter range.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Current Transfer Ratio (Min)	20% @ 1mA
Current Transfer Ratio (Max)	400% @ 1mA
Output Type	Transistor
Voltage - Output (Max)	35V
Current - Output / Channel	50mA
Rise / Fall Time (Typ)	4µs, 3µs
Vce Saturation (Max)	200mV
Operating Temperature	-55°C ~ 100°C
Package / Case	4-SMD, Gull Wing
Mounting Type	Surface Mount
Input Type	AC, DC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The HCPL-354-000E qualifies as a parametric equivalent to the IS126 based on the following substitution criteria:

Isolation voltage matches at 3750Vrms, ensuring equivalent galvanic separation capability. Single channel configuration is maintained. Current transfer ratio specifications are identical: 20% minimum and 400% maximum at 1mA input current. Output stage characteristics are equivalent: 35V maximum output voltage, 50mA maximum output current per channel, and 200mV maximum Vce saturation. Rise and fall times are identical at 4µs and 3µs respectively. Both devices support AC and DC input types. Operating temperature range is identical at -55°C to 100°C. Package configuration is 4-SMD Gull Wing for both parts. Both devices maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Mounting type is surface mount for both components.

Parameter Comparison

Parameter	IS126 (Isocom)	HCPL-354-000E (Broadcom)	Match Status
Voltage - Isolation	3750Vrms	3750Vrms	Equivalent
Number of Channels	1	1	Equivalent
Current Transfer Ratio (Min)	20% @ 1mA	20% @ 1mA	Equivalent
Current Transfer Ratio (Max)	400% @ 1mA	400% @ 1mA	Equivalent
Output Type	Transistor	Transistor	Equivalent
Voltage - Output (Max)	35V	35V	Equivalent
Current - Output / Channel	50mA	50mA	Equivalent
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	Equivalent
Vce Saturation (Max)	200mV	200mV	Equivalent
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	Equivalent
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Input Type	AC, DC	AC, DC	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Both the IS126 and HCPL-354-000E maintain Active product status with full ROHS3 compliance and REACH unaffected classification. Selection between these components is based on availability and supply chain requirements rather than electrical or mechanical performance differences. The HCPL-354-000E is supplied in Cut Tape and Digi-Reel packaging, while the IS126 is supplied in Tape & Reel format. Both components are suitable for applications requiring 3750Vrms isolation with transistor output in surface mount 4-SMD Gull Wing packages. Compliance certifications (ECCN EAR99, HTSUS 8541.49.8000) are identical for both parts.

Frequently Asked Questions (FAQ)

Q: Can the HCPL-354-000E directly replace the IS126 in existing designs?

A: Yes. All electrical parameters, isolation voltage, output characteristics, operating temperature range, and package configuration are equivalent. Surface mount assembly compatibility is maintained.

Q: Are there differences in packaging that affect component handling?

A: The IS126 is supplied in Tape & Reel format, while the HCPL-354-000E is supplied in Cut Tape and Digi-Reel format. Both are surface mount compatible with identical 4-SMD Gull Wing package dimensions.

Q: Do both parts support the same input signal types?

A: Yes. Both the IS126 and HCPL-354-000E support AC and DC input types with identical current transfer ratio specifications.

Q: What is the isolation voltage capability for both parts?

A: Both components provide 3750Vrms galvanic isolation, suitable for high-voltage isolation applications.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, classified under ECCN EAR99, and carry the same HTSUS code 8541.49.8000.

Q: What is the maximum output current capability?

A: Both parts support 50mA maximum output current per channel with 35V maximum output voltage and 200mV maximum Vce saturation.

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