4N26 Optoisolator Transistor Output - Equivalent & Substitute Parts

Part Overview

The 4N26 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 rated isolation voltage of 7.5Vpk. The device is classified as Active status and is suitable for applications requiring DC input signal isolation with transistor-based output control. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges.

Substiute Parts

4N26

Isocom Components 2004 LTDIn Stock: 5218484N26 Datasheet

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4N25-000E

Broadcom LimitedIn Stock: 30614N25-000E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N26 optoisolator is determined by the following critical parameters:

• Single Channel Configuration: Substitute parts must maintain 1-channel architecture
• Transistor Output with Base: Output stage must include base connection for external control
• Package Compatibility: 6-DIP through-hole mounting with 0.300" (7.62mm) pitch
• DC Input Type: Input signal processing must support DC operation
• Current Transfer Ratio: Minimum 20% @ 10mA specification must be met or exceeded
• Output Voltage Rating: Maximum output voltage capability of 30V or higher
• Output Current Capability: Minimum 50mA per channel
• Vce Saturation: Maximum 500mV specification
• Operating Temperature Range: -55°C to 100°C minimum coverage
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status

The 4N25-000E qualifies as a substitute based on matching all critical parameters while offering enhanced isolation voltage (2500Vrms vs 7.5Vpk) and increased output current capability (100mA vs 50mA).

Parameter Comparison

Engineering Selection Recommendations

Both the 4N26 and 4N25-000E maintain Active product status, ensuring continued availability and manufacturing support. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

The 4N25-000E substitute provides superior isolation voltage performance (2500Vrms compared to 7.5Vpk) and increased output current capacity (100mA versus 50mA), making it suitable for applications requiring higher isolation ratings or greater load-driving capability. The slightly increased rise and fall times (3µs versus 2µs) remain within acceptable switching performance for most DC isolation applications.

Selection between these parts should be based on specific application requirements for isolation voltage and output current demands, with both components offering equivalent functional compatibility within the 6-DIP through-hole package format.

Frequently Asked Questions (FAQ)

Q: Can the 4N25-000E directly replace the 4N26 in existing PCB designs?

A: Yes. Both components use identical 6-DIP (0.300", 7.62mm) through-hole packaging and pin configuration for transistor output with base connection. No PCB layout modifications are required for mechanical compatibility.

Q: What is the primary difference between these optoisolators?

A: The 4N25-000E provides significantly higher isolation voltage (2500Vrms versus 7.5Vpk) and greater output current capability (100mA versus 50mA). Both maintain identical current transfer ratio specifications and output voltage ratings.

Q: Are there any switching speed differences between these parts?

A: The 4N26 exhibits faster rise and fall times (2µs) compared to the 4N25-000E (3µs). For applications with strict timing requirements below 3µs, the 4N26 should be retained. For most standard DC isolation applications, this difference is not functionally significant.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the 4N26 and 4N25-000E are ROHS3 compliant and REACH unaffected, meeting current electronic component regulatory requirements.

Q: Which part should be selected for high-voltage isolation applications?

A: The 4N25-000E is specified for 2500Vrms isolation, making it suitable for applications requiring enhanced galvanic isolation. The 4N26 is rated for 7.5Vpk isolation and should be used only in applications matching this specification.

Q: Are both components available in the same packaging format?

A: Yes. Both the 4N26 and 4N25-000E are supplied in 6-DIP through-hole packages with 0.300" (7.62mm) pitch, ensuring identical mechanical compatibility and PCB mounting procedures.