SLD8S13A Equivalent & Substitute Parts

Part Overview

The SLD8S13A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for automotive-grade transient protection applications. This component features a 13V reverse standoff voltage with a 21.5V maximum clamping voltage and 326A peak pulse current capability in a surface mount SMTO-263 package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Substiute Parts

SLD8S13A

Littelfuse Inc.In Stock: 1181SLD8S13A Datasheet

Current PartRFQ

SLD13U-017

Littelfuse Inc.In Stock: 697SLD13U-017 Datasheet

MFR RecommendedRFQ

SLD8S14A

Littelfuse Inc.In Stock: 1762SLD8S14A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SLD8S13A 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 channel configuration
• Automotive grade qualification (AEC-Q101)
• Operating temperature range: -55°C ~ 175°C (TJ)
• RoHS3 compliance

Substitute Parts Identified:

SLD8S14A maintains identical mounting technology (surface mount SMTO-263 package) and series lineage (SLD8S). This part operates at a higher voltage rating (14V reverse standoff, 23.2V clamping) with comparable peak pulse power (7000W) and active product status.

SLD13U-017 provides electrical equivalence at the specified voltage ratings (13V reverse standoff, 21.5V clamping) with active product status and full automotive qualification. This part differs in mounting technology (through-hole P600 package) and peak pulse current capacity (237.2A versus 326A).

Parameter Comparison

Engineering Selection Recommendations

SLD8S14A is the preferred direct substitute for surface mount applications. Both parts share identical package geometry (SMTO-263), mounting technology, and peak pulse power rating (7000W). The SLD8S14A maintains active product status and full AEC-Q101 automotive qualification. The voltage rating differential (14V standoff versus 13V) represents a higher protection threshold suitable for applications tolerating increased clamping voltage.

SLD13U-017 provides exact electrical equivalence at the original voltage specifications (13V standoff, 21.5V clamping) with active product status and AEC-Q101 qualification. Selection of this part requires PCB redesign to accommodate through-hole mounting (P600 package) in place of surface mount technology. Peak pulse current capacity is reduced to 237.2A and peak pulse power to 5000W.

Both substitute parts maintain automotive-grade classification and ROHS3 compliance, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can SLD8S14A directly replace SLD8S13A on existing PCBs?

A: Yes, for surface mount applications. Both parts use identical SMTO-263 package geometry and footprint. The higher voltage rating (14V standoff, 23.2V clamping) provides increased protection margin in the same physical form factor.

Q: What are the key differences between SLD8S14A and SLD13U-017?

A: SLD8S14A maintains surface mount SMTO-263 packaging with 7000W peak pulse power and 301A peak pulse current. SLD13U-017 uses through-hole P600 axial packaging with 5000W peak pulse power and 237.2A peak pulse current. SLD13U-017 matches the original voltage specifications exactly (13V standoff, 21.5V clamping), while SLD8S14A operates at higher voltage ratings.

Q: Is PCB redesign required to use SLD13U-017?

A: Yes. SLD13U-017 requires through-hole mounting in contrast to the surface mount SMTO-263 package of the original SLD8S13A. PCB layout modification is necessary.

Q: Do all substitute parts maintain automotive qualification?

A: Yes. Both SLD8S14A and SLD13U-017 carry AEC-Q101 automotive qualification and ROHS3 compliance, matching the original part's regulatory status.

Q: Which substitute part should be selected for new designs?

A: Selection depends on mounting technology requirements. For surface mount applications, SLD8S14A is the direct package equivalent. For through-hole applications or designs requiring exact voltage matching at the original specifications, SLD13U-017 is appropriate.