SA13ARLG Equivalent & Substitute Parts

Part Overview

The SA13ARLG is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This axial-lead, through-hole component operates with a 13V reverse standoff voltage and provides 21.5V clamping at peak pulse current. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs requiring similar electrical performance characteristics.

Substiute Parts

SA13ARLG

Littelfuse Inc.In Stock: 1178SA13ARLG Datasheet

Current PartRFQ

SA13A

Fairchild SemiconductorIn Stock: 2531SA13A Datasheet

DirectRFQ

SLD13U-017

Littelfuse Inc.In Stock: 697SLD13U-017 Datasheet

MFR RecommendedRFQ

SLD13U-017-B

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

MFR RecommendedRFQ

1N8156

Microchip TechnologyIn Stock: 10341N8156 Datasheet

MFR RecommendedRFQ

P5KE13A-AP

Micro Commercial CoIn Stock: 867P5KE13A-AP Datasheet

MFR RecommendedRFQ

P5KE13A-BP

Micro Commercial CoIn Stock: 847P5KE13A-BP Datasheet

MFR RecommendedRFQ

P5KE13A-TP

Micro Commercial CoIn Stock: 769P5KE13A-TP Datasheet

MFR RecommendedRFQ

P6KE15A

Fairchild SemiconductorIn Stock: 35449P6KE15A Datasheet

MFR RecommendedRFQ

SA13A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 894SA13A-E3/54 Datasheet

MFR RecommendedRFQ

SA13AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 742SA13AHE3/54 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SA13ARLG is determined by matching the following critical electrical parameters:

• Voltage - Reverse Standoff: 13V (±tolerance)
• Voltage - Clamping (Max) @ Ipp: 21.5V
• Current - Peak Pulse (10/1000µs): minimum 23.2A
• Power - Peak Pulse: minimum 500W
• Mounting Type: Through Hole
• Package compatibility: DO-204AC (DO-15) or equivalent axial form factor
• Type: Zener diode, unidirectional

Substitute parts are grouped into two categories based on electrical performance and product status:

Category 1: Direct Electrical Equivalents (500W class) Parts matching the original 500W power rating and 23.2A peak pulse current specification with identical voltage parameters.

Category 2: Enhanced Performance Alternatives (5kW class) Parts with superior power handling (5000W) and significantly higher peak pulse current (237.2A) while maintaining identical voltage specifications. These provide upgraded protection capability for the same voltage class.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents)

The P5KE13A series (P5KE13A-AP, P5KE13A-BP, P5KE13A-TP) from Micro Commercial Co provide the most direct electrical equivalence to the SA13ARLG. These parts maintain identical voltage parameters (13V standoff, 21.5V clamping) and peak pulse current (23.2A) with 500W power rating. All three variants are active products with extended operating temperature ranges (-65°C to 175°C), offering improved thermal performance over the original part. Selection among the three variants depends on packaging requirements (AP, BP, TP designations indicate different packaging configurations).

The SA13A-E3/54 and SA13AHE3/54 from Vishay General Semiconductor provide equivalent electrical performance with 23.3A peak pulse current and active product status. SA13AHE3/54 includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Enhanced Performance Alternative

The SLD13U-017 and SLD13U-017-B from Littelfuse Inc. maintain identical voltage specifications while providing significantly enhanced power handling (5000W versus 500W) and peak pulse current capability (237.2A versus 23.2A). Both variants are active products with AEC-Q101 automotive qualification. The P600 package differs from the original DO-204AC form factor; mechanical fit verification is required before selection. These parts are suitable for applications requiring higher transient energy absorption.

Limited Compatibility Option

The 1N8156 from Microchip Technology is an active product with matching 13V standoff voltage but provides substantially reduced peak pulse current (6.73A) and power rating (150W). This part is suitable only for applications with lower transient energy requirements and is not recommended as a direct replacement for the SA13ARLG in circuits designed for 23.2A peak pulse protection.

The P6KE15A from Fairchild Semiconductor operates at a slightly lower standoff voltage (12.8V) with marginally lower clamping voltage (21.2V) but provides higher peak pulse current (29A) and power rating (600W). This part is suitable for applications where the slightly lower voltage threshold is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I use the P5KE13A series as a direct replacement for the SA13ARLG?

A: Yes. The P5KE13A-AP, P5KE13A-BP, and P5KE13A-TP variants from Micro Commercial Co provide identical electrical performance with 13V standoff voltage, 21.5V clamping voltage, and 23.2A peak pulse current. All three are active products. Verify packaging compatibility with your circuit board layout, as the DO-15 package is standard for these parts.

Q: What is the difference between the P5KE13A variants (AP, BP, TP)?

A: The AP, BP, and TP designations indicate different packaging and tape configurations for the same electrical component. Selection depends on your procurement and assembly requirements. Consult the specific datasheet for packaging details.

Q: Should I use the SLD13U-017 instead of the P5KE13A series?

A: The SLD13U-017 is suitable if your application requires higher transient energy absorption (5000W versus 500W) or higher peak pulse current handling (237.2A versus 23.2A). However, the P600 package differs from the original DO-204AC form factor. Verify mechanical compatibility with your circuit board before selection. For standard 500W applications, the P5KE13A series is the more direct replacement.

Q: Is the 1N8156 a suitable replacement?

A: The 1N8156 maintains the 13V standoff voltage but provides only 6.73A peak pulse current and 150W power rating. This part is suitable only for applications with significantly lower transient energy requirements and is not recommended as a direct replacement for circuits designed for 23.2A protection.

Q: What is the difference between SA13A-E3/54 and SA13AHE3/54?

A: Both parts provide identical electrical performance (13V standoff, 21.5V clamping, 23.3A peak pulse current). The SA13AHE3/54 includes AEC-Q101 automotive qualification and is supplied in Tape & Reel packaging. The SA13A-E3/54 is supplied in Cut Tape packaging. Select based on your packaging and qualification requirements.

Q: Can I use the P6KE15A as a replacement?

A: The P6KE15A operates at a slightly lower standoff voltage (12.8V) and clamping voltage (21.2V) compared to the SA13ARLG (13V and 21.5V respectively). This part is suitable only if your circuit design tolerates the lower voltage threshold. The higher peak pulse current (29A) and power rating (600W) provide enhanced protection capability.

Q: Are all substitute parts RoHS compliant?

A: The P5KE13A series, SA13A-E3/54, SA13AHE3/54, and SLD13U-017 variants are ROHS3 compliant. The 1N8156 is RoHS non-compliant. Verify compliance requirements for your application before final selection.

Q: What operating temperature range should I consider?

A: The SA13ARLG operates from -55°C to 150°C. Most substitute parts extend this range to -55°C or -65°C minimum and 175°C maximum, providing improved thermal performance. The P6KE15A operates from -50°C to 175°C. Verify that the selected part meets your application's temperature requirements.