IS357D Optoisolator Transistor Output Equivalent & Substitute Parts

Part Overview

The IS357D is an active optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 4-pin surface mount device provides 3750Vrms isolation with a single channel configuration, designed for DC input applications requiring galvanic isolation in industrial and consumer electronics. The part is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance, isolation voltage, output characteristics, and mounting compatibility are maintained across the specified parameter range.

Key Parameters

Parameter	Value
Manufacturer Part Number	IS357D
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	3750Vrms
Current Transfer Ratio (Min)	300% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	200mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the IS357D are qualified based on strict electrical and mechanical parameter equivalence. The substitution criteria are:

Voltage - Isolation: 3750Vrms (exact match required)
Number of Channels: 1 (single channel configuration)
Output Type: Transistor (DC switching output)
Current Transfer Ratio: 300% minimum @ 5mA (minimum performance threshold)
Voltage - Output (Max): 80V (maximum collector voltage rating)
Current - Output / Channel: 50mA (maximum output current)
Vce Saturation (Max): 200mV (saturation voltage specification)
Operating Temperature: -55°C ~ 100°C (temperature range)
Mounting Type: Surface Mount (PCB assembly compatibility)
Input Type: DC (input signal type)
RoHS Status: ROHS3 Compliant (environmental compliance)

All substitute parts listed maintain these core parameters within the specified tolerances, ensuring functional and electrical interchangeability in applications designed for the IS357D.

Parameter Comparison

Parameter	IS357D	IS121D	IS181D	IS2701-1D	HCPL-181-00DE	HCPL-181-06DE
Manufacturer	Isocom	Isocom	Isocom	Isocom	Broadcom	Broadcom
Number of Channels	1	1	1	1	1	1
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Current Transfer Ratio (Min)	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	200mV	200mV	200mV	200mV	200mV	200mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status with ROHS3 compliance and REACH unaffected classification. Selection between IS357D and substitute optoisolators should be based on:

Isocom Components 2004 LTD parts (IS121D, IS181D, IS2701-1D) provide direct manufacturer equivalence with identical electrical specifications and packaging configurations. These parts differ only in series designation and packaging format (Tape & Reel versus Cut Tape & Digi-Reel).

Broadcom Limited parts (HCPL-181-00DE, HCPL-181-06DE) offer cross-manufacturer substitution with equivalent electrical performance and compliance certifications. These parts utilize 4-Mini-Flat packaging format while maintaining identical electrical characteristics and operating parameters.

Packaging format differences between Gull Wing (IS357D, IS121D, IS2701-1D, IS181D) and 4-Mini-Flat (HCPL-181-00DE, HCPL-181-06DE) require PCB footprint verification prior to implementation. All parts maintain surface mount assembly compatibility and identical lead spacing within their respective package families.

Frequently Asked Questions (FAQ)

Q: Can IS121D replace IS357D directly on the same PCB?

A: IS121D is electrically equivalent to IS357D with identical isolation voltage (3750Vrms), current transfer ratio (300-600% @ 5mA), output voltage (80V max), and output current (50mA). Both use 4-SMD Gull Wing packaging. Substitution is valid provided PCB footprint and assembly process are compatible with the specific part series.

Q: What is the difference between IS181D and IS357D?

A: IS181D and IS357D are electrically equivalent optoisolators with identical isolation voltage, current transfer ratio, output specifications, and operating temperature range. IS181D is supplied in Cut Tape & Digi-Reel packaging format, while IS357D is supplied in Tape & Reel format. Both use 4-SMD Gull Wing package configuration.

Q: Are Broadcom HCPL-181 parts compatible with Isocom IS357D?

A: HCPL-181-00DE and HCPL-181-06DE are electrically equivalent to IS357D with matching isolation voltage (3750Vrms), current transfer ratio (300-600% @ 5mA), output characteristics (80V, 50mA), and operating temperature (-55°C to 100°C). The primary difference is packaging format: HCPL-181 parts use 4-Mini-Flat configuration while IS357D uses 4-SMD Gull Wing. PCB footprint compatibility must be verified before substitution.

Q: What parameters must remain constant for optoisolator substitution?

A: Critical parameters for substitution equivalence are isolation voltage (3750Vrms), number of channels (1), output type (transistor), current transfer ratio minimum (300% @ 5mA), maximum output voltage (80V), maximum output current (50mA), and saturation voltage (200mV max). Operating temperature range (-55°C to 100°C) and compliance certifications (ROHS3) must also be maintained.

Q: Can I use HCPL-181-06DE if my design specifies IS357D?

A: HCPL-181-06DE provides electrical equivalence to IS357D across all specified parameters. However, packaging format differs (4-Mini-Flat versus 4-SMD Gull Wing), requiring PCB footprint redesign. Verify component placement, lead spacing, and assembly process compatibility before implementation.

Q: What is the inventory status of substitute parts?

A: IS121D has 42,600 units in stock. IS181D has 2,580 units. IS2701-1D has 4,400 units. HCPL-181-00DE has 44,400 units. HCPL-181-06DE has 1,240 units. IS357D has 5,400 units in stock.

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