V320LT20AP Equivalent & Substitute Parts

Part Overview

The V320LT20AP is a 510 V, 4.5 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc. in the LT series. This through-hole disc component (14mm) is designed for transient voltage protection applications requiring high surge current capacity and energy absorption. The part is currently in active production status with 671 units available in new original inventory. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product category, enabling component sourcing flexibility while preserving circuit performance specifications.

Substiute Parts

V320LT20AP

Littelfuse Inc.In Stock: 775V320LT20AP Datasheet

Current PartRFQ

V320LS20AP

Littelfuse Inc.In Stock: 3695V320LS20AP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The V320LS20AP is identified as a parametric equivalent to the V320LT20AP based on the following substitution criteria:

Electrical Parameters (Identical):

• Maximum AC Volts: 320 V
• Maximum DC Volts: 420 V
• Varistor Voltage Range: 459 V (Min) to 561 V (Max), with 510 V typical
• Current - Surge: 4.5 kA
• Energy Absorption: 80 J
• Capacitance @ 1 MHz: 380 pF
• Number of Circuits: 1

Mechanical Parameters (Identical):

• Mounting Type: Through Hole
• Package / Case: Disc 14mm
• Packaging: Cut Tape (CT)

Environmental & Compliance (Identical):

• Operating Temperature: -55°C to 85°C
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected

The only difference between the main part and substitute is the internal series designation (LT versus LS), which does not affect electrical performance or mechanical compatibility. Both parts maintain identical functional specifications for transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

Both the V320LT20AP and V320LS20AP are active production components from Littelfuse Inc. with full ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on inventory availability and lead time requirements. The V320LS20AP currently has higher inventory availability (3633 units) compared to the V320LT20AP (671 units), making it a viable alternative when supply constraints exist. Both parts are suitable for direct substitution in through-hole PCB applications requiring 510 V transient voltage suppression with 4.5 kA surge current capacity. No performance degradation or functional compromise occurs when substituting between these two part numbers.

Frequently Asked Questions (FAQ)

Q: Can the V320LS20AP be used as a direct replacement for the V320LT20AP?

A: Yes. All electrical parameters, mechanical specifications, and environmental ratings are identical. The parts differ only in internal series designation (LT versus LS) and are functionally interchangeable in circuit applications.

Q: Are there any PCB layout or mounting considerations when substituting between these parts?

A: No. Both parts use identical through-hole mounting with 14mm disc packaging. PCB footprints, lead spacing, and soldering procedures remain unchanged.

Q: Do both parts meet the same compliance and regulatory requirements?

A: Yes. Both the V320LT20AP and V320LS20AP are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). No additional qualification or testing is required when substituting between these parts.

Q: What is the operating temperature range for both parts?

A: Both parts operate across the identical temperature range of -55°C to 85°C (TA), ensuring consistent performance across environmental conditions.

Q: Are there differences in surge current handling or energy absorption between these parts?

A: No. Both parts are rated for 4.5 kA surge current and 80 J energy absorption. Transient voltage suppression performance is equivalent.