4N22 Optoisolator Transistor with Base Output - Equivalent & Substitute Parts

Part Overview

The 4N22 is an optoisolator transistor with base output designed for high-voltage isolation applications. This component provides 1000VDC isolation between input and output circuits with a single channel configuration. The part is currently active in production and widely used in industrial control, power management, and signal isolation circuits where galvanic isolation is required. Substitute parts are identified to support design flexibility, inventory management, and supply chain continuity.

Substiute Parts

4N22

TT Electronics/Optek TechnologyIn Stock: 10994N22 Datasheet

Current PartRFQ

4N22A

TT Electronics/Optek TechnologyIn Stock: 10454N22A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N22 are identified based on strict parametric equivalence across the following critical criteria:

• Voltage isolation rating: 1000VDC
• Number of channels: 1
• Output configuration: Transistor with Base
• Current transfer ratio minimum: 25% @ 10mA
• Maximum output voltage: 35V
• Maximum output current per channel: 50mA
• Package type: TO-78-6 Metal Can
• Operating temperature range: -65°C ~ 125°C
• Input type: DC
• Mounting method: Through Hole

All substitute parts listed maintain identical electrical performance specifications and physical packaging, ensuring direct functional interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N22 and 4N22A are active production parts manufactured by TT Electronics/Optek Technology with identical electrical and mechanical specifications. Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for industrial applications.

Selection between these parts should be based on availability and supply chain considerations. The 4N22A is a direct parametric equivalent suitable for applications where the primary 4N22 is unavailable. No performance degradation or functional compromise occurs when substituting between these parts in circuit designs that meet the specified electrical and thermal operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the 4N22A be used as a direct replacement for the 4N22?

A: Yes. The 4N22A is a parametric equivalent with identical isolation voltage (1000VDC), current transfer ratio (25% @ 10mA), output voltage rating (35V), output current capability (50mA), and package configuration (TO-78-6 Metal Can). Both parts are active production components from the same manufacturer.

Q: What are the critical parameters that define substitutability for this optoisolator?

A: Substitutability is determined by: isolation voltage rating, number of channels, output transistor configuration with base connection, current transfer ratio minimum specification, maximum output voltage and current ratings, operating temperature range, and TO-78-6 Metal Can package type. All these parameters must match exactly for functional equivalence.

Q: Are there any compliance or certification differences between the 4N22 and 4N22A?

A: No. Both parts carry identical ROHS3 compliance status and REACH unaffected designation. Both are rated for the same operating temperature range (-65°C ~ 125°C) and moisture sensitivity level (MSL 1 - Unlimited).

Q: What is the significance of the TO-78-6 Metal Can package for this component?

A: The TO-78-6 Metal Can package is a through-hole mounted configuration with six leads. This package type is critical for substitution compatibility as it determines PCB layout, lead spacing, and mounting hole requirements. Only parts with identical TO-78-6 Metal Can packaging can be directly substituted without circuit board redesign.

Q: Can this optoisolator be used in applications requiring isolation voltages higher than 1000VDC?

A: No. The 4N22 and 4N22A are rated for 1000VDC isolation maximum. Applications requiring higher isolation voltages require different component selection.