MOC8021 Equivalent & Substitute Parts

Part Overview

The MOC8021 is a high-voltage optoisolator with Darlington output, rated for 5300Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MOC8021 serves applications requiring galvanic isolation in high-voltage environments with single-channel Darlington output configuration in 6-DIP through-hole packaging.

Substiute Parts

MOC8021

onsemiIn Stock: 1546MOC8021 Datasheet

Current PartRFQ

MOC8021M

onsemiIn Stock: 2994MOC8021M Datasheet

DirectRFQ

LTV-715F

Lite-On Inc.In Stock: 910LTV-715F Datasheet

SimilarRFQ

MOC8021

onsemiIn Stock: 1546MOC8021 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC8021 is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Single-channel Darlington output configuration
• Isolation voltage rating (minimum 4170Vrms acceptable for most applications)
• Output voltage rating (minimum 35V acceptable)
• Output current capability (minimum 80mA acceptable)
• Current transfer ratio performance (minimum 600% @ 1mA acceptable)

Mechanical Compatibility Criteria:

• 6-DIP through-hole package format (0.300", 7.62mm)
• DC input type
• Operating temperature range overlap

Compliance Criteria:

• REACH compliance status
• RoHS compliance status where applicable

The MOC8021M (onsemi) qualifies as a direct manufacturer equivalent with active product status. The LTV-715F (Lite-On Inc.) qualifies as a functional substitute with comparable isolation voltage and Darlington output characteristics.

Parameter Comparison

Engineering Selection Recommendations

MOC8021M (onsemi): This part is the preferred substitute. It maintains onsemi manufacturer continuity, carries active product status, and achieves ROHS3 compliance. The isolation voltage is reduced to 4170Vrms, which remains within acceptable parameters for most applications requiring the original MOC8021. Output voltage and current ratings are identical. The turn-on time increases from 4.6µs to 8.5µs; this difference must be evaluated against application timing requirements.

LTV-715F (Lite-On Inc.): This part provides an alternative from a different manufacturer with active product status and ROHS3 compliance. The isolation voltage of 5000Vrms closely matches the original specification. However, the maximum output voltage is reduced to 35V and maximum output current is reduced to 80mA. These reductions require verification against application load requirements. The operating temperature range is narrower (-25°C minimum versus -55°C minimum), which may restrict use in low-temperature environments.

Selection between MOC8021M and LTV-715F depends on application-specific requirements for output voltage, output current, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can MOC8021M directly replace MOC8021 in all applications?

A: MOC8021M is electrically compatible for most applications. The primary difference is the reduced isolation voltage (4170Vrms versus 5300Vrms) and increased turn-on time (8.5µs versus 4.6µs). Applications requiring the full 5300Vrms isolation rating or faster switching response must be evaluated individually.

Q: What are the key differences between MOC8021M and LTV-715F?

A: Both parts provide single-channel Darlington optoisolation in 6-DIP packaging. MOC8021M maintains onsemi manufacturer continuity with higher output voltage (50V) and current (150mA) ratings. LTV-715F offers comparable isolation voltage (5000Vrms) but with reduced output specifications (35V, 80mA) and a narrower operating temperature range.

Q: Are all substitute parts pin-compatible with MOC8021?

A: Yes. MOC8021, MOC8021M, and LTV-715F all use 6-DIP (0.300", 7.62mm) through-hole packaging with identical pin configurations for single-channel Darlington optoisolators.

Q: Which substitute is recommended for new designs?

A: MOC8021M is recommended for new designs requiring onsemi continuity and active product support. LTV-715F is suitable where manufacturer diversification is acceptable and output specifications meet application requirements.

Q: Are there compliance differences between the substitutes?

A: MOC8021M and LTV-715F both achieve ROHS3 compliance and REACH Unaffected status. The original MOC8021 does not specify RoHS compliance due to its obsolete status.