IS281J Optoisolator Transistor Output - Equivalent & Substitute Parts

Part Overview

The IS281J is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 4-pin surface mount component provides galvanic isolation up to 3750Vrms with a single channel configuration. The device is classified as Active product status and is suitable for applications requiring DC input isolation with transistor switching output. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter range.

Substiute Parts

IS281J

Isocom Components 2004 LTDIn Stock: 865IS281J Datasheet

Current PartRFQ

IS2801-1

Isocom Components 2004 LTDIn Stock: 45263IS2801-1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IS281J is determined by strict equivalence across the following critical parameters:

• Voltage - Isolation: 3750Vrms
• Number of Channels: 1
• Output Type: Transistor
• Current Transfer Ratio range: 50% to 600% @ 5mA
• Voltage - Output (Max): 80V
• Current - Output / Channel: 50mA
• Vce Saturation (Max): 200mV
• Package / Case: 4-SOIC (0.173", 4.40mm Width)
• Operating Temperature: -55°C ~ 110°C
• Input Type: DC
• Mounting Type: Surface Mount

The IS2801-1 meets all specified electrical and mechanical parameters and is classified as a parametric equivalent. Both parts share identical isolation voltage, channel configuration, output characteristics, and thermal operating range. Package dimensions and mounting specifications are equivalent.

Parameter Comparison

Engineering Selection Recommendations

The IS2801-1 is a direct parametric equivalent to the IS281J. Both components are manufactured by Isocom Components 2004 LTD and maintain identical electrical specifications, mechanical packaging, and regulatory compliance status. Selection between these parts is based on availability and inventory considerations rather than technical performance differences.

Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints for either component. Product status for both parts is Active, confirming ongoing manufacturing support and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can IS2801-1 be used as a direct replacement for IS281J?

A: Yes. The IS2801-1 meets all electrical and mechanical specifications of the IS281J. Isolation voltage, channel configuration, output characteristics, current transfer ratio range, operating temperature, and package dimensions are identical across both parts.

Q: Are there any differences in isolation voltage between these parts?

A: No. Both IS281J and IS2801-1 provide 3750Vrms isolation voltage. This parameter is identical and is a primary criterion for substitution compatibility.

Q: Do both parts use the same package?

A: Yes. Both components use the 4-SOIC package with 0.173" width (4.40mm). Surface mount orientation and PCB footprint compatibility are maintained.

Q: What is the current transfer ratio specification for these optoisolators?

A: Both parts specify a current transfer ratio range of 50% to 600% at 5mA input current. This range defines the optical coupling efficiency between the LED input and transistor output stages.

Q: Are there any compliance or regulatory differences?

A: No. Both IS281J and IS2801-1 are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is rated as 1 (Unlimited) for both parts, indicating no special handling requirements.

Q: What is the maximum output current for these devices?

A: The maximum output current per channel is 50mA for both IS281J and IS2801-1. This specification applies to the transistor output stage.

Q: What operating temperature range is supported?

A: Both parts operate across -55°C to 110°C. This temperature range applies to all electrical specifications and performance guarantees.