IS181 Optoisolator Transistor Output Equivalent & Substitute Parts

Part Overview

The IS181 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 transistor output configuration. The part is currently in active production status with 2750 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the isolation voltage, current transfer ratio, output specifications, and package compatibility requirements.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	200mV
Rise / Fall Time (Typ)	4µs, 3µs
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the IS181 are qualified based on strict equivalence of the following critical parameters:

Voltage - Isolation: 3750Vrms
Number of Channels: 1
Current Transfer Ratio range: 50% to 600% @ 5mA
Output Type: Transistor
Voltage - Output (Max): 80V
Current - Output / Channel: 50mA
Vce Saturation (Max): 200mV
Rise / Fall Time: 4µs, 3µs
Operating Temperature: -55°C ~ 100°C
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts maintain these electrical and mechanical specifications. Packaging format differences (Tape & Reel versus Cut Tape & Digi-Reel) do not affect functional equivalence.

Parameter Comparison

Parameter	IS181	IS121	IS357	HCPL-181-060E
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Broadcom Limited
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA
Vce Saturation (Max)	200mV	200mV	200mV	200mV
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Operating Temperature	-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
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Inventory (Pcs)	2750	5592	6920	3230

Engineering Selection Recommendations

All substitute parts—IS121, IS357, and HCPL-181-060E—are qualified equivalents to the IS181 based on identical electrical specifications and compliance certifications. Selection between these parts is determined by:

Manufacturer Continuity: IS121 and IS357 maintain supply from Isocom Components 2004 LTD, the original IS181 manufacturer. HCPL-181-060E is supplied by Broadcom Limited and represents a cross-manufacturer equivalent.

Packaging Format: IS181 and IS121 are supplied in Tape & Reel format. IS357 and HCPL-181-060E are supplied in Cut Tape & Digi-Reel format. Packaging selection depends on assembly line requirements and order quantity.

Inventory Availability: IS357 has the highest stock level at 6920 units, followed by IS121 at 5592 units, HCPL-181-060E at 3230 units, and IS181 at 2750 units.

Regulatory Compliance: All parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.49.8000. All maintain MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can IS121 be used as a direct replacement for IS181?

A: Yes. IS121 is a parametric equivalent with identical electrical specifications, isolation voltage, current transfer ratio, output characteristics, and operating temperature range. Both are supplied by Isocom Components 2004 LTD in 4-SMD Gull Wing packages with Tape & Reel packaging.

Q: What is the difference between IS357 and IS181?

A: IS357 and IS181 are electrically equivalent across all critical parameters. The primary difference is packaging format: IS181 is supplied in Tape & Reel, while IS357 is supplied in Cut Tape & Digi-Reel format. Both use 4-SMD Gull Wing package geometry.

Q: Is HCPL-181-060E compatible with IS181 in circuit design?

A: Yes. HCPL-181-060E maintains all electrical specifications required for IS181 substitution, including 3750Vrms isolation, 50-600% current transfer ratio, 80V maximum output voltage, and 50mA output current. The manufacturer is Broadcom Limited rather than Isocom Components 2004 LTD, but functional equivalence is maintained.

Q: Does packaging format affect circuit performance?

A: No. Tape & Reel and Cut Tape & Digi-Reel formats are supply chain packaging methods only. The 4-SMD Gull Wing package geometry and electrical performance remain identical across all substitute parts.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. IS121, IS357, and HCPL-181-060E are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching IS181 compliance status.

Q: Which substitute part should be selected for new designs?

A: Selection is based on supply chain requirements, packaging format preference, and inventory availability. All parts are active production items with equivalent electrical performance and regulatory compliance.

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