4N28SM Optoisolator - Equivalent & Substitute Parts

Part Overview

The 4N28SM is a single-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation between input and output circuits using a 6-pin surface mount package. The device is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across isolation voltage, current transfer ratio, output specifications, and package configuration.

Substiute Parts

4N28SM

Isocom Components 2004 LTDIn Stock: 28624N28SM Datasheet

Current PartRFQ

4N28XSM

Isocom Components 2004 LTDIn Stock: 7594N28XSM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 4N28XSM qualifies as a parametric equivalent substitute for the 4N28SM based on strict alignment of critical electrical and mechanical parameters. Substitution eligibility is determined by matching the following specifications:

• Single-channel configuration with transistor output topology
• Isolation voltage of 7.5Vpk
• Minimum current transfer ratio of 10% @ 10mA
• Maximum output voltage of 30V
• Output current capability of 50mA per channel
• Maximum Vce saturation of 500mV
• Operating temperature range of -55°C to 100°C
• 6-pin surface mount package with gull wing lead configuration
• RoHS3 compliance and REACH unaffected status

Both parts maintain identical electrical performance characteristics and physical packaging specifications, enabling direct substitution in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N28SM and 4N28XSM maintain Active product status with full regulatory compliance. Selection between these parts is based on availability and inventory considerations rather than electrical or mechanical differentiation. The 4N28SM currently maintains higher inventory levels at 2782 pieces, while the 4N28XSM has 709 pieces available. Both components satisfy RoHS3 compliance requirements and carry MSL Level 1 designation, indicating no moisture sensitivity constraints during storage and handling. REACH compliance status is identical across both parts, with no restricted substances of concern.

Frequently Asked Questions (FAQ)

Q: Can the 4N28XSM directly replace the 4N28SM in existing circuit designs?

A: Yes. All electrical parameters, output characteristics, and package specifications are identical. No circuit modifications or PCB layout changes are required for substitution.

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

A: No. Both parts provide 7.5Vpk isolation voltage with identical current transfer ratio specifications of 10% minimum at 10mA input current.

Q: Do these parts have different moisture sensitivity requirements?

A: No. Both components carry MSL Level 1 designation, indicating unlimited shelf life without moisture sensitivity constraints.

Q: Are there compliance or regulatory differences between the 4N28SM and 4N28XSM?

A: No. Both parts maintain identical RoHS3 compliance status and REACH unaffected designation. No additional certifications or compliance documentation variations exist.

Q: What is the maximum output current capability for both parts?

A: Both the 4N28SM and 4N28XSM support 50mA maximum output current per channel with 30V maximum output voltage rating.

Q: Are the package configurations identical?

A: Yes. Both parts use 6-pin surface mount packages with gull wing lead configuration, enabling direct PCB footprint compatibility.