EPS15 Equivalent & Substitute Parts

Part Overview

The EPS15 is a Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose transient voltage protection applications. This bidirectional zener diode operates with a 15V reverse standoff voltage and provides 26V clamping at peak pulse current. The component is housed in an axial through-hole package (A, Axial) and is currently in active product status with 995 units in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be achieved within the specified parameter ranges for TVS diode applications. Substitution becomes necessary when the primary part reaches end-of-life status, inventory constraints occur, or alternative sourcing is required while maintaining circuit protection specifications.

Substiute Parts

EPS15

Microchip TechnologyIn Stock: 1103EPS15 Datasheet

Current PartRFQ

1.5KE18A

Taiwan Semiconductor CorporationIn Stock: 33821.5KE18A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EPS15 is evaluated based on the following critical electrical and mechanical parameters:

Voltage Parameters: The reverse standoff voltage, breakdown voltage minimum, and clamping voltage maximum must fall within acceptable tolerance ranges to ensure equivalent transient suppression performance. The EPS15 operates at 15V standoff with 26V maximum clamping.

Current Handling: Peak pulse current capacity determines the diode's ability to suppress transient events. The EPS15 handles 33.9A at 8/20µs pulse duration.

Power Dissipation: Peak pulse power rating of 150W establishes the thermal stress limit during transient events.

Package Compatibility: Through-hole axial mounting is required for mechanical fit and circuit board integration.

Diode Type: Zener-type TVS diodes with single-channel bidirectional or unidirectional configurations are functionally equivalent for general-purpose protection applications.

The substitute part 1.5KE18A meets these criteria with comparable voltage ratings (15.3V standoff, 25.5V clamping), higher current capacity (60A), and superior power handling (1500W), while maintaining through-hole axial package compatibility.

Parameter Comparison

Engineering Selection Recommendations

EPS15 Selection Criteria: The EPS15 remains the primary choice for applications requiring bidirectional transient suppression with the specified voltage and current parameters. This part is active in production status and maintains RoHS non-compliant designation. Selection is appropriate when bidirectional protection is mandatory and the 150W peak pulse power rating is sufficient for the application.

1.5KE18A Selection Criteria: The 1.5KE18A substitute provides enhanced performance characteristics with 60A peak pulse current capacity and 1500W peak pulse power rating, representing a 10-fold increase in power handling. This part achieves ROHS3 compliance and maintains active product status. The substitute is suitable for applications where unidirectional protection is acceptable and higher transient energy absorption is beneficial. The operating temperature range extends to -55°C minimum, which is 10°C higher than the EPS15 minimum specification.

Compliance Considerations: The 1.5KE18A offers ROHS3 compliance, whereas the EPS15 is RoHS non-compliant. Both parts are REACH Unaffected and classified under ECCN EAR99 and HTSUS 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can the 1.5KE18A directly replace the EPS15 in all applications?

A: The 1.5KE18A provides equivalent voltage protection with superior current and power handling. However, the EPS15 is bidirectional while the 1.5KE18A is unidirectional. Direct substitution is valid only when the application circuit topology permits unidirectional protection. Verify circuit polarity requirements before substitution.

Q: What is the difference between bidirectional and unidirectional TVS diodes?

A: Bidirectional TVS diodes (EPS15) suppress transients in both polarities and are used in AC circuits or applications with undefined polarity. Unidirectional TVS diodes (1.5KE18A) suppress transients in one direction only and are used in DC circuits with defined polarity. Application circuit design determines which type is appropriate.

Q: Are the package dimensions compatible between EPS15 and 1.5KE18A?

A: Both parts use through-hole axial packages. The EPS15 uses package A (Axial), while the 1.5KE18A uses DO-201AA/DO-27 (Axial). Both are axial through-hole configurations suitable for standard PCB mounting. Physical lead spacing should be verified against PCB pad layout before assembly.

Q: What is the significance of the higher power rating on the 1.5KE18A?

A: The 1.5KE18A peak pulse power rating of 1500W versus the EPS15 rating of 150W indicates superior thermal capacity during transient suppression events. This allows the 1.5KE18A to absorb higher-energy transients without thermal degradation. Applications with severe transient environments benefit from this enhanced rating.

Q: Does the operating temperature range difference affect substitution?

A: The EPS15 operates from -65°C to 175°C, while the 1.5KE18A operates from -55°C to 175°C. The 1.5KE18A has a 10°C higher minimum operating temperature. Substitution is valid for applications operating above -55°C. Applications requiring operation below -55°C must retain the EPS15.

Q: What does RoHS compliance mean for component selection?

A: ROHS3 compliance (1.5KE18A) indicates the part meets Restriction of Hazardous Substances regulations and contains no restricted materials. RoHS non-compliant parts (EPS15) may contain restricted substances. Selection depends on regulatory requirements for the end application and geographic market.