IS357C Optoisolator Transistor Output Equivalent & Substitute Parts

Part Overview

The IS357C is an active optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 4-pin surface mount device provides 3750Vrms isolation voltage with a single channel configuration, designed for DC input applications requiring galvanic isolation. The part is currently in active production status with 45,200 units in stock. Substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the optoisolator transistor output category.

Key Parameters

Parameter	Value
Manufacturer Part Number	IS357C
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	3750Vrms
Current Transfer Ratio (Min)	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 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 IS357C are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Voltage - Isolation: 3750Vrms (exact match required)
Number of Channels: 1 (exact match required)
Current Transfer Ratio: 200% minimum @ 5mA (exact match required)
Output Type: Transistor (exact match required)
Voltage - Output (Max): 80V (exact match required)
Current - Output / Channel: 50mA (exact match required)
Vce Saturation (Max): 200mV (exact match required)
Operating Temperature: -55°C ~ 100°C (exact match required)
Mounting Type: Surface Mount (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

All identified substitute parts meet these electrical and mechanical criteria. Variations in packaging format (4-SMD Gull Wing, 4-Mini-Flat, 4-SO) and supplier device package designations are permitted within the same functional category.

Parameter Comparison

Parameter	IS357C	IS121C	IS181C	IS2701-1C	HCPL-181-00CE	HCPL-181-06CE
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)	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 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
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
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
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)
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Input Type	DC	DC	DC	DC	DC	DC
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed maintain active production status and ROHS3 compliance, ensuring long-term availability and regulatory conformance. Selection between IS357C and its substitutes should be based on:

Isocom Components 2004 LTD series (IS357C, IS121C, IS181C, IS2701-1C) offer consistent supply from a single manufacturer with identical electrical specifications and REACH unaffected status.

Broadcom Limited HCPL-181 series (HCPL-181-00CE, HCPL-181-06CE) provides cross-manufacturer equivalence with identical electrical performance and compliance certifications. HCPL-181-06CE maintains higher inventory availability (35,300 units) compared to HCPL-181-00CE (1,174 units).

Packaging format differences (4-SMD Gull Wing vs. 4-Mini-Flat vs. 4-SO) require PCB layout verification to ensure mechanical fit within the target application.

Frequently Asked Questions (FAQ)

Q: Can IS121C be used as a direct replacement for IS357C?

A: Yes. IS121C meets all electrical and mechanical requirements: 3750Vrms isolation, 1 channel, 200-400% current transfer ratio @ 5mA, 80V maximum output voltage, 50mA output current, 200mV maximum Vce saturation, -55°C to 100°C operating range, surface mount configuration, and ROHS3 compliance. Both use 4-SMD Gull Wing packaging.

Q: What is the difference between HCPL-181-00CE and HCPL-181-06CE?

A: Both parts are electrically identical with matching isolation voltage, current transfer ratio, output specifications, and operating temperature range. The primary difference is the supplier device package designation: HCPL-181-00CE uses 4-Mini-Flat packaging while HCPL-181-06CE uses 4-SO packaging. PCB layout compatibility must be verified for each package type.

Q: Are Isocom and Broadcom optoisolators interchangeable in the same circuit?

A: Yes, provided the package format is compatible with the PCB design. All listed Isocom (IS357C, IS121C, IS181C, IS2701-1C) and Broadcom (HCPL-181-00CE, HCPL-181-06CE) parts share identical electrical specifications, isolation voltage, current transfer characteristics, output voltage and current ratings, saturation voltage, and operating temperature range.

Q: Which substitute part has the best inventory availability?

A: HCPL-181-06CE maintains the highest inventory level at 35,300 units. IS357C and IS181C each have approximately 45,000+ units available. IS2701-1C has limited availability at 4,300 units.

Q: Do all substitute parts comply with RoHS and REACH regulations?

A: Yes. All listed parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement.

Q: Can package format be changed during production?

A: Package format changes require PCB layout modification and design verification. While electrical specifications remain identical across 4-SMD Gull Wing, 4-Mini-Flat, and 4-SO packages, physical dimensions and pin configurations differ. Design review is necessary before implementing package substitutions.

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