SLD22-018 Equivalent & Substitute Parts

Part Overview

The SLD22-018 is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for through-hole applications in automotive-grade circuits. This bidirectional Zener diode provides transient overvoltage protection with a 22V reverse standoff voltage and 35.5V maximum clamping voltage at peak pulse current. The part is actively produced and maintains AEC-Q101 automotive qualification with ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design standardization, or supply chain optimization.

Substiute Parts

SLD22-018

Littelfuse Inc.In Stock: 1557SLD22-018 Datasheet

Current PartRFQ

5KP22CA

Littelfuse Inc.In Stock: 44435KP22CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SLD22-018 is based on strict equivalence across the following critical parameters:

Voltage specifications: Reverse standoff voltage of 22V, breakdown voltage minimum of 24V or greater, and maximum clamping voltage of 35.5V at peak pulse current establish the protection threshold and response characteristics.

Current and power ratings: Peak pulse current of 143.7A at 10/1000µs pulse duration and peak pulse power of 5000W (5kW) define the transient energy dissipation capability.

Package and mounting: P600 axial through-hole package ensures mechanical and electrical compatibility with existing PCB designs.

Environmental and compliance specifications: Operating temperature range of -55°C to 175°C, automotive grade classification, AEC-Q101 qualification, and ROHS3 compliance ensure suitability for automotive applications.

The 5KP22CA meets all these criteria and is identified as a manufacturer-recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the SLD22-018 and 5KP22CA are active production parts from Littelfuse Inc. with identical electrical performance specifications and mechanical compatibility. Selection between these parts is determined by availability and supply chain requirements rather than technical differentiation.

The 5KP22CA is designated as the manufacturer-recommended substitute and carries equivalent automotive-grade qualification and AEC-Q101 certification. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for automotive applications.

Direct substitution is permissible without circuit redesign or re-qualification when transitioning between these part numbers.

Frequently Asked Questions (FAQ)

Q: Can the 5KP22CA replace the SLD22-018 in existing designs?

A: Yes. Both parts share identical voltage ratings (22V reverse standoff, 35.5V clamping), current specifications (143.7A peak pulse), power dissipation (5kW), temperature range (-55°C to 175°C), and P600 axial through-hole package. No circuit modifications are required.

Q: Are there differences in automotive qualification between these parts?

A: No. Both parts carry AEC-Q101 qualification and automotive-grade classification, meeting identical regulatory requirements for automotive applications.

Q: What is the significance of the P600 package specification?

A: The P600 axial package defines the physical form factor and electrical connection method. Both substitute parts use this identical package, ensuring mechanical fit and PCB compatibility without layout changes.

Q: Do these parts have different compliance certifications?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited), ensuring equivalent environmental and regulatory compliance.

Q: What determines whether a part qualifies as a substitute?

A: Substitution is based on matching reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, power dissipation, operating temperature range, package type, and compliance certifications. All these parameters must align for direct substitution without design changes.