H11A2 Optoisolator Equivalent & Substitute Parts

Part Overview

The H11A2 is a 5000Vrms optoisolator transistor with base output in a 6-DIP package manufactured by Lite-On Inc. This component provides galvanic isolation for DC input signals with transistor output capability. The H11A2 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across isolation voltage, channel configuration, package type, and output characteristics.

Substiute Parts

H11A2

Lite-On Inc.In Stock: 1528H11A2 Datasheet

Current PartRFQ

4N26M

onsemiIn Stock: 509034N26M Datasheet

MFR RecommendedRFQ

H11A2-V

Everlight Electronics Co LtdIn Stock: 1257H11A2-V Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the H11A2 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Single channel configuration (1 channel required)
• 6-DIP through-hole package format
• Transistor output with base connection
• DC input type
• Isolation voltage rating of 5000Vrms or higher
• Current transfer ratio minimum of 20% @ 10mA
• Operating temperature range encompassing -55°C to 100°C

Substitute Parts Identified:

1. H11A2-V (Everlight Electronics Co Ltd) - Direct form, fit, and function equivalent with identical isolation voltage (5000Vrms) and matching base electrical characteristics.

2. 4N26M (onsemi) - Functional substitute with lower isolation voltage (4170Vrms) but matching channel count, package, output type, and current transfer ratio specification.

Parameter Comparison

Engineering Selection Recommendations

H11A2-V (Everlight Electronics Co Ltd) is the primary substitute for the obsolete H11A2. Both parts share identical isolation voltage (5000Vrms), matching electrical specifications, and equivalent thermal operating range. H11A2-V is ROHS3 compliant and currently in active production status. The higher maximum output voltage (80V vs 30V) provides additional design margin without affecting compatibility in applications rated for 30V operation.

4N26M (onsemi) is a functional alternative when isolation voltage requirements permit operation at 4170Vrms. This part maintains matching channel count, package format, output type, and current transfer ratio. The 4N26M is ROHS3 compliant and REACH unaffected. The lower isolation rating and slightly higher Vce saturation (500mV vs 400mV) must be evaluated against specific application requirements. The operating temperature minimum of -40°C (versus -55°C for H11A2) may limit use in extended low-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can H11A2-V directly replace H11A2 in existing designs?

A: Yes. H11A2-V maintains identical isolation voltage (5000Vrms), current transfer ratio (20% @ 10mA), output type (transistor with base), and 6-DIP package configuration. Pin-for-pin compatibility is established across all critical electrical parameters.

Q: What are the limitations of using 4N26M as a substitute?

A: The 4N26M operates at 4170Vrms isolation voltage, which is lower than the H11A2 specification of 5000Vrms. Applications requiring the full 5000Vrms isolation rating cannot use 4N26M. Additionally, the minimum operating temperature is -40°C rather than -55°C, and Vce saturation is 500mV versus 400mV.

Q: Are both substitute parts available in the same packaging?

A: Yes. Both H11A2-V and 4N26M are supplied in 6-DIP (0.300", 7.62mm) through-hole packages, matching the original H11A2 package specification.

Q: What compliance certifications apply to substitute parts?

A: H11A2-V and 4N26M are both ROHS3 compliant. H11A2-V has moisture sensitivity level 1 (unlimited). 4N26M is REACH unaffected and has no moisture sensitivity classification.

Q: How do the forward voltage characteristics compare?

A: H11A2 and H11A2-V both specify 1.2V typical forward voltage. 4N26M specifies 1.18V typical forward voltage. All three parts share the same maximum DC forward current rating of 60mA.