4N38ASM Equivalent & Substitute Parts

Part Overview

The 4N38ASM is a single-channel optoisolator with transistor output and base connection, manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation between input and output circuits with a 7.5Vpk isolation voltage rating. The part is currently active in production and widely used in applications requiring DC input signal isolation with transistor-based output control. Alternative part numbers within the same series are available to support supply chain flexibility and inventory optimization.

Substiute Parts

4N38ASM

Isocom Components 2004 LTDIn Stock: 8424N38ASM Datasheet

Current PartRFQ

4N38AXSM

Isocom Components 2004 LTDIn Stock: 11264N38AXSM Datasheet

Parametric EquivalentRFQ

4N38XSM

Isocom Components 2004 LTDIn Stock: 10214N38XSM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 4N38ASM has two parametric equivalents within the 4N38 series: 4N38AXSM and 4N38XSM. These parts are classified as substitutes based on identical electrical and mechanical specifications across all critical parameters that define functional compatibility:

Key Parameters for Substitution Equivalence:

• Single-channel configuration with transistor output and base connection
• Isolation voltage: 7.5Vpk
• Current transfer ratio minimum: 20% @ 10mA
• Maximum output voltage: 80V
• Maximum output current per channel: 50mA
• Forward voltage (Typ): 1.2V
• Maximum DC forward current: 60mA
• Vce saturation (Max): 1V
• Rise and fall time: 2µs each
• Operating temperature range: -55°C ~ 100°C
• Surface mount package: 6-SMD, Gull Wing
• Compliance certifications: ROHS3 Compliant, REACH Unaffected

All three part numbers share identical electrical performance characteristics and mechanical form factors, making them direct functional equivalents for circuit design and PCB layout purposes.

Parameter Comparison

Engineering Selection Recommendations

All three part numbers—4N38ASM, 4N38AXSM, and 4N38XSM—are active production components from Isocom Components 2004 LTD with identical electrical specifications and mechanical packaging. Selection between these equivalents should be based on supply chain availability and inventory status rather than technical performance differences.

Both 4N38AXSM and 4N38XSM are direct functional replacements for 4N38ASM in any circuit application. All parts maintain ROHS3 compliance and REACH unaffected status, supporting regulatory requirements for industrial and commercial applications. The 6-SMD Gull Wing package format is consistent across all variants, ensuring PCB layout compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can 4N38AXSM and 4N38XSM be used interchangeably with 4N38ASM?

A: Yes. All three part numbers share identical electrical characteristics, isolation voltage, output current ratings, and mechanical packaging. They are direct functional equivalents and can be substituted without circuit redesign or PCB layout changes.

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

A: No. All three variants maintain 7.5Vpk isolation voltage and 50mA maximum output current per channel. Current transfer ratio, forward voltage, and saturation characteristics are identical across all part numbers.

Q: Do all three parts meet the same compliance standards?

A: Yes. 4N38ASM, 4N38AXSM, and 4N38XSM are all ROHS3 compliant and REACH unaffected. Moisture sensitivity level is 1 (Unlimited) for all variants.

Q: Is the 6-SMD Gull Wing package identical for all three parts?

A: Yes. Package and case specifications are identical, ensuring direct PCB compatibility without layout modifications.

Q: What is the operating temperature range for these optoisolators?

A: All three parts operate across -55°C to 100°C, supporting industrial and extended temperature applications.

Q: Can these parts be used in high-speed switching applications?

A: Yes. Rise and fall times of 2µs for all variants support switching applications within this timing specification.