SA13ARL Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA13ARL is a unidirectional Zener-type transient voltage suppressor manufactured by onsemi, designed for general-purpose overvoltage protection in through-hole axial configurations. This component features a 13V reverse standoff voltage with a 21.5V maximum clamping voltage and 23.2A peak pulse current capability. The SA13ARL is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and component procurement.

Substiute Parts

SA13ARL

onsemiIn Stock: 865SA13ARL Datasheet

Current PartRFQ

SA13A

Fairchild SemiconductorIn Stock: 2531SA13A Datasheet

DirectRFQ

1N8156

Microchip TechnologyIn Stock: 10341N8156 Datasheet

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P5KE13A-AP

Micro Commercial CoIn Stock: 867P5KE13A-AP Datasheet

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P5KE13A-BP

Micro Commercial CoIn Stock: 847P5KE13A-BP Datasheet

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P5KE13A-TP

Micro Commercial CoIn Stock: 769P5KE13A-TP Datasheet

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P6KE15A

Fairchild SemiconductorIn Stock: 35449P6KE15A Datasheet

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SLD13U-017

Littelfuse Inc.In Stock: 697SLD13U-017 Datasheet

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SLD13U-017-B

Littelfuse Inc.In Stock: 932SLD13U-017-B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SA13ARL is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 13V
• Voltage - Clamping (Max) @ Ipp: 21.5V
• Unidirectional Zener configuration
• Through-hole axial or DO-15 package compatibility
• Peak pulse current capability: minimum 23.2A

Substitute Categories:

Direct Electrical Equivalents (Identical Clamping Voltage & Current): Parts meeting all primary criteria with matching 21.5V clamping and 23.2A+ peak pulse current.

Electrical Equivalents with Enhanced Performance: Parts with identical standoff and clamping voltages but higher peak pulse current ratings, suitable for applications requiring additional transient energy dissipation margin.

Similar Voltage Class with Reduced Current Rating: Parts with matching 13V standoff and 21.5V clamping but lower peak pulse current, applicable only where circuit transient energy is lower than the original design specification.

Higher Voltage Class Alternatives: Parts with slightly lower standoff voltage (12.8V) but comparable clamping characteristics, usable only where the 0.2V tolerance is acceptable within system design margins.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for Pin-Compatible Replacement):

The P5KE13A series (P5KE13A-AP, P5KE13A-BP, P5KE13A-TP) manufactured by Micro Commercial Co provide direct electrical equivalence to the SA13ARL with identical 13V standoff, 21.5V clamping, and 23.2A peak pulse current. All three variants are active products with extended operating temperature range (-65°C ~ 175°C) compared to the original -55°C ~ 150°C specification. These parts are suitable for direct board-level substitution in DO-15 package configurations.

Tier 2 - Enhanced Performance Substitutes:

The SLD13U-017 and SLD13U-017-B from Littelfuse Inc. maintain identical voltage specifications (13V standoff, 21.5V clamping) while providing significantly higher peak pulse current (237.2A) and power dissipation (5000W). These parts are AEC-Q101 qualified automotive-grade components in active production status. The P600 package requires mechanical accommodation but offers superior transient energy handling. Selection is appropriate where circuit transient energy exceeds the original 500W specification or where automotive-grade qualification is required.

Tier 3 - Functional Alternatives with Trade-offs:

The SA13A from Fairchild Semiconductor provides near-identical electrical performance (23.7A peak pulse) with extended temperature range but is also obsolete. The 1N8156 from Microchip Technology is active but exhibits reduced peak pulse current (6.73A) and power dissipation (150W), making it unsuitable for applications requiring the full 23.2A transient capability. The P6KE15A from Fairchild Semiconductor offers enhanced current (29A) and power (600W) but operates at a lower standoff voltage (12.8V), introducing a 0.2V tolerance deviation.

Compliance Considerations:

The P5KE13A series and SLD13U-017/SLD13U-017-B variants are ROHS3 compliant or REACH unaffected, supporting modern procurement requirements. The original SA13ARL is RoHS non-compliant, making active-status substitutes preferable for new designs and long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the P5KE13A series directly replace the SA13ARL without circuit modification?

A: Yes. The P5KE13A-AP, P5KE13A-BP, and P5KE13A-TP variants provide identical electrical specifications (13V standoff, 21.5V clamping, 23.2A peak pulse) and are available in DO-15 package compatible with the original axial configuration. No circuit redesign is required.

Q: What is the difference between P5KE13A-AP, P5KE13A-BP, and P5KE13A-TP?

A: All three variants share identical electrical specifications and package configuration. The suffix designations (-AP, -BP, -TP) indicate different manufacturing or distribution batches from Micro Commercial Co. Selection among these variants is based on availability and procurement source preference, with no functional difference in circuit performance.

Q: Why would I select the SLD13U-017 over the P5KE13A series?

A: The SLD13U-017 is selected when circuit transient energy exceeds 500W or when automotive-grade AEC-Q101 qualification is required. The 237.2A peak pulse current and 5000W power rating provide significantly higher transient energy margin. The P600 package requires mechanical accommodation on the PCB but is standard for high-energy suppression applications.

Q: Is the 1N8156 a suitable replacement?

A: The 1N8156 is not recommended as a direct replacement. While it maintains the 13V standoff voltage, its peak pulse current (6.73A) and power dissipation (150W) are substantially lower than the SA13ARL specification (23.2A, 500W). Use only in applications where transient energy is confirmed to be below 150W.

Q: Can I use the P6KE15A as a substitute?

A: The P6KE15A is a functional alternative only where the 0.2V lower standoff voltage (12.8V vs. 13V) is acceptable within system design margins. It offers enhanced current (29A) and power (600W) but introduces a voltage tolerance deviation. Verify circuit protection thresholds before selection.

Q: What is the significance of the P600 package used by SLD13U-017?

A: The P600 package is a larger through-hole axial format designed for high-energy transient suppression. It requires PCB footprint accommodation different from the standard DO-15 package but provides superior thermal and current handling characteristics. Mechanical compatibility with existing board layouts must be confirmed.

Q: Are there temperature range considerations when substituting?

A: The SA13ARL operates to 150°C maximum junction temperature. Most active substitutes (P5KE13A series, SLD13U-017, P6KE15A) extend to 175°C, providing additional thermal margin. The 1N8156 also reaches 175°C. If the application operates near the original 150°C limit, the extended range of substitutes provides design headroom.

Q: Which substitute offers the best long-term supply chain stability?

A: The P5KE13A series from Micro Commercial Co and the SLD13U-017/SLD13U-017-B from Littelfuse Inc. are both active products with established manufacturing and distribution networks. The Littelfuse SLD series includes automotive-grade qualification, supporting extended product lifecycle in automotive and industrial applications.