4N27G Optoisolator - Equivalent & Substitute Parts

Part Overview

The 4N27G is a single-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 6-DIP through-hole component provides galvanic isolation with a 7.5Vpk isolation voltage rating and is designed for DC input applications requiring transistor-based output control. The part is currently in active production status with 1055 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the specified tolerances for this optoisolator category.

Substiute Parts

4N27G

Isocom Components 2004 LTDIn Stock: 10774N27G Datasheet

Current PartRFQ

4N27XG

Isocom Components 2004 LTDIn Stock: 11704N27XG Datasheet

Parametric EquivalentRFQ

4N28XG

Isocom Components 2004 LTDIn Stock: 8254N28XG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N27G are identified based on strict equivalence of the following critical parameters:

• Single channel configuration (Number of Channels = 1)
• Isolation voltage rating (7.5Vpk)
• Current transfer ratio minimum specification (10% @ 10mA)
• Transistor output with base connection
• Maximum output voltage (30V)
• Maximum output current per channel (50mA)
• Maximum Vce saturation (500mV)
• Operating temperature range (-55°C ~ 100°C)
• 6-DIP through-hole package format (0.400", 10.16mm)
• ROHS3 compliance and REACH unaffected status

The 4N27XG and 4N28XG meet all these electrical and mechanical criteria and are therefore classified as parametric equivalents.

Parameter Comparison

Engineering Selection Recommendations

All three parts—4N27G, 4N27XG, and 4N28XG—maintain active production status and full ROHS3 compliance with REACH unaffected designation. Selection between these optoisolators should be based on availability and inventory levels. The 4N27XG offers the highest current inventory at 1088 units, followed by the 4N27G at 1055 units, and the 4N28XG at 812 units. All parts are suitable for direct substitution in applications requiring single-channel optoisolation with the specified electrical and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 4N27XG be used as a direct replacement for the 4N27G?

A: Yes. The 4N27XG is a parametric equivalent with identical electrical specifications, isolation voltage, output current rating, and 6-DIP package format. Both parts are manufactured by Isocom Components 2004 LTD and maintain the same performance characteristics.

Q: What is the difference between the 4N27G and 4N28XG?

A: Both parts are functionally equivalent across all critical electrical and mechanical parameters. The primary distinction is the series designation (4N27 versus 4N28), which does not affect substitutability. All specified parameters including isolation voltage, current transfer ratio, output voltage/current ratings, and package format are identical.

Q: Are these parts compatible with through-hole PCB designs?

A: Yes. All three parts feature through-hole mounting in a 6-DIP package with 0.400" (10.16mm) spacing, suitable for standard through-hole PCB assembly processes.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. The 4N27G, 4N27XG, and 4N28XG are all ROHS3 compliant and REACH unaffected, meeting the same environmental and regulatory standards.

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

A: All three parts operate across the temperature range of -55°C to 100°C, providing consistent performance across industrial and commercial applications.