4N27SM Optoisolator - Equivalent & Substitute Parts

Part Overview

The 4N27SM 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 light-coupled interface. 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

4N27SM

Isocom Components 2004 LTDIn Stock: 164594N27SM 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 to the 4N27SM based on the following substitution criteria:

Electrical Parameters Match:

• Voltage - Isolation: 7.5Vpk (identical)
• Current Transfer Ratio (Min): 10% @ 10mA (identical)
• Output Type: Transistor with Base (identical)
• Voltage - Output (Max): 30V (identical)
• Current - Output / Channel: 50mA (identical)
• Vce Saturation (Max): 500mV (identical)
• Operating Temperature: -55°C ~ 100°C (identical)

Mechanical Parameters Match:

• Package / Case: 6-SMD, Gull Wing (identical)
• Input Type: DC (identical)

Compliance Parameters Match:

• RoHS Status: ROHS3 Compliant (identical)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (identical)
• REACH Status: REACH Unaffected (identical)

The 4N28XSM belongs to the 4N28 series while the main part is 4N27 series. Both devices maintain identical electrical and mechanical specifications within the allowed parameters for this optoisolator category.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N27SM and 4N28XSM maintain Active product status with identical compliance certifications. The 4N27SM has higher inventory availability (16400 Pcs) compared to the 4N28XSM (709 Pcs). Selection between these parts should be based on supply chain requirements and lead time considerations. Both parts satisfy RoHS3 compliance and REACH unaffected requirements for regulated applications. The identical electrical and mechanical parameters ensure functional interchangeability within the specified operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the 4N28XSM directly replace the 4N27SM in existing designs?

A: Yes. The 4N28XSM provides identical electrical performance across all specified parameters including isolation voltage, current transfer ratio, output voltage and current ratings, and saturation characteristics. Both devices use the same 6-SMD Gull Wing package configuration.

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

A: No. Both the 4N27SM and 4N28XSM maintain 7.5Vpk isolation voltage specification.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 Compliant, REACH Unaffected, and carry identical Moisture Sensitivity Level (MSL) rating of 1 (Unlimited).

Q: What is the difference between the 4N27 and 4N28 series designation?

A: The series designation reflects internal product line organization within Isocom Components 2004 LTD. Within the allowed electrical and mechanical parameters specified for this optoisolator category, both series maintain equivalent performance characteristics.

Q: Are the rise and fall times identical?

A: Yes. Both parts specify 2µs rise time and 2µs fall time.

Q: Can these parts be used interchangeably in surface mount applications?

A: Yes. Both parts use identical 6-SMD Gull Wing surface mount packaging and can be placed using the same assembly processes and equipment.