4N28G Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N28G 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-DIP through-hole 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 the same product category, enabling direct replacement in circuit designs without performance degradation.

Substiute Parts

4N28G

Isocom Components 2004 LTDIn Stock: 7104N28G 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 4N28G are identified based on strict parametric equivalence across the following critical specifications:

• Single-channel configuration (Number of Channels: 1)
• Isolation voltage rating (7.5Vpk)
• Minimum current transfer ratio (10% @ 10mA)
• Transistor output with base connection
• Maximum output voltage (30V)
• Output current capability (50mA per channel)
• Vce saturation characteristic (500mV maximum)
• Operating temperature range (-55°C ~ 100°C)
• 6-DIP through-hole package format (0.400", 10.16mm)
• RoHS3 compliance and REACH unaffected status

All substitute parts maintain identical electrical performance and mechanical compatibility, enabling direct circuit board replacement.

Parameter Comparison

Engineering Selection Recommendations

All three optoisolator models (4N28G, 4N27XG, 4N28XG) maintain Active product status with full RoHS3 compliance and REACH unaffected designation. Selection between these parts is based on availability and inventory levels rather than electrical or mechanical differentiation. The 4N27XG variant offers 1088 units in stock, the 4N28XG provides 812 units, and the 4N28G maintains 678 units. All parts are supplied in tube packaging through the same manufacturer, ensuring consistent quality and certification across substitution choices.

Frequently Asked Questions (FAQ)

Q: Can 4N27XG and 4N28XG be used interchangeably with 4N28G?

A: Yes. All three parts share identical electrical specifications including isolation voltage, current transfer ratio, output voltage rating, output current capability, and saturation characteristics. The 6-DIP through-hole package format is identical across all variants, enabling direct board-level substitution without circuit modification.

Q: Are there any compliance differences between substitute parts?

A: No. All substitute parts maintain RoHS3 compliance, REACH unaffected status, and identical moisture sensitivity level (MSL 1 - Unlimited). Regulatory and environmental certifications are equivalent across the 4N28G, 4N27XG, and 4N28XG.

Q: What determines substitution eligibility for these optoisolators?

A: Substitution is determined by matching critical parameters: single-channel configuration, 7.5Vpk isolation voltage, 10% minimum current transfer ratio at 10mA input, transistor output with base connection, 30V maximum output voltage, 50mA output current per channel, 500mV maximum Vce saturation, -55°C to 100°C operating temperature range, and 6-DIP through-hole package format.

Q: Are there any package or pinout differences?

A: No. All substitute parts use the identical 6-DIP (0.400", 10.16mm) through-hole package with matching pinout configuration. Direct PCB replacement is supported without layout modification.

Q: What is the basis for selecting between available substitutes?

A: Selection is based on inventory availability and supply chain requirements. The 4N27XG, 4N28XG, and 4N28G are parametrically equivalent and functionally interchangeable. Procurement decisions should consider stock levels and lead time requirements from the supplier.