SLD26-018-B Equivalent & Substitute Parts

Part Overview

The SLD26-018-B is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in electronic circuits. This through-hole component operates with a 26V reverse standoff voltage and provides 5000W peak pulse power dissipation. The part is actively produced and carries AEC-Q101 automotive qualification, making it suitable for automotive and industrial applications requiring reliable surge suppression. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility to ensure seamless circuit performance.

Substiute Parts

SLD26-018-B

Littelfuse Inc.In Stock: 787SLD26-018-B Datasheet

Current PartRFQ

5KP26CA

Diotec SemiconductorIn Stock: 42065KP26CA Datasheet

MFR RecommendedRFQ

5KP26CA-TP

Micro Commercial CoIn Stock: 10955KP26CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLD26-018-B are qualified based on the following critical parameters that determine functional equivalence:

• Voltage - Reverse Standoff: 26V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 42.1V (exact match required)
• Power - Peak Pulse: 5000W (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: P600 or R-6 Axial (mechanically compatible)
• Type: Zener, Bidirectional (functional equivalence)
• RoHS Status: ROHS3 Compliant (regulatory compliance)

The identified substitutes maintain electrical performance within the specified transient voltage suppression parameters while offering alternative packaging formats and manufacturer options.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and ROHS3 compliance, ensuring regulatory alignment for new designs and production environments.

The SLD26-018-B carries AEC-Q101 automotive qualification, designating it for automotive-grade applications. The 5KP26CA and 5KP26CA-TP substitutes do not list automotive qualification in the provided specifications.

For applications requiring automotive-grade components with AEC-Q101 certification, the SLD26-018-B remains the specified choice. For general industrial applications where automotive qualification is not mandated, the 5KP26CA (Diotec, P600 package) and 5KP26CA-TP (Micro Commercial Co, R-6 package) provide electrical equivalence with matching voltage and power ratings.

Package selection between P600 and R-6 axial formats depends on circuit board layout and mechanical mounting constraints. Both packages accommodate through-hole mounting with compatible lead spacing for standard PCB hole patterns.

Frequently Asked Questions (FAQ)

Q: Can the 5KP26CA substitute for the SLD26-018-B in automotive applications?

A: The 5KP26CA matches all critical electrical parameters (26V standoff, 42.1V clamping, 5000W power). However, the SLD26-018-B carries AEC-Q101 automotive qualification while the 5KP26CA does not list this certification. For automotive applications requiring AEC-Q101 compliance, the SLD26-018-B is the specified part.

Q: What is the difference between the P600 and R-6 package formats?

A: Both P600 and R-6 are axial through-hole packages for TVS diodes. The difference lies in physical dimensions and lead spacing. Package selection depends on PCB layout requirements and mechanical mounting specifications. Verify footprint compatibility with your circuit board design before substitution.

Q: Are the operating temperature ranges compatible across all three parts?

A: The SLD26-018-B and 5KP26CA-TP operate across -55°C to 175°C. The 5KP26CA operates across -50°C to 175°C, providing a 5°C narrower lower temperature range. For applications requiring operation below -50°C, the SLD26-018-B or 5KP26CA-TP are appropriate selections.

Q: What is the significance of the 121.1A versus 119A peak pulse current difference?

A: Both values fall within the 10/1000µs pulse waveform specification for TVS diodes. The 2.1A difference represents less than 2% variation and does not affect functional equivalence for transient suppression applications. Both parts dissipate the same 5000W peak pulse power.

Q: Can I use these parts interchangeably in existing designs?

A: Electrical substitution is valid based on matching voltage and power parameters. Mechanical substitution requires verification of package compatibility (P600 versus R-6) with existing PCB footprints. Automotive applications must maintain AEC-Q101 qualification requirements.