SLD18-018-B Equivalent & Substitute Parts

Part Overview

The SLD18-018-B is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for through-hole mounting in P600 axial package configuration. This component operates with an 18V reverse standoff voltage and provides 5000W peak pulse power protection. The part maintains active product status and carries AEC-Q101 automotive qualification with ROHS3 compliance. Substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the TVS diode category.

Substiute Parts

SLD18-018-B

Littelfuse Inc.In Stock: 1065SLD18-018-B Datasheet

Current PartRFQ

5KP18CA

Diotec SemiconductorIn Stock: 61755KP18CA Datasheet

MFR RecommendedRFQ

15KP18CA-TP

Micro Commercial CoIn Stock: 129215KP18CA-TP Datasheet

MFR RecommendedRFQ

5KP18CA-TP

Micro Commercial CoIn Stock: 16475KP18CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLD18-018-B are qualified based on the following electrical and mechanical criteria:

Primary Matching Parameters:

• Voltage - Reverse Standoff: 18V
• Voltage - Breakdown (Min): 20V
• Type: Zener, Bidirectional
• Mounting Type: Through Hole
• Power - Peak Pulse: 5000W or higher
• RoHS Status: ROHS3 Compliant
• Operating Temperature Range: Minimum -55°C to 175°C

Package Compatibility: Substitutes may use alternative axial package designations (P600 or R-6) provided mechanical fit and lead configuration remain compatible with through-hole mounting applications.

Three substitute parts meet these criteria with active product status and full compliance documentation.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain active product status with ROHS3 compliance certification. Selection between substitutes depends on application-specific requirements:

5KP18CA (Diotec Semiconductor): Matches the SLD18-018-B in voltage clamping (29.2V), peak pulse power (5000W), and P600 package configuration. Peak pulse current specification (171A) is within 2% of the main part. Operating temperature minimum is -50°C versus -55°C for the main part. Suitable for applications where the -50°C lower limit is acceptable.

5KP18CA-TP (Micro Commercial Co): Provides identical electrical specifications (18V standoff, 29.2V clamping, 5000W peak pulse) with full temperature range (-55°C to 175°C) matching the main part. Package configuration uses R-6 axial instead of P600. Suitable where R-6 package footprint is compatible with board layout.

15KP18CA-TP (Micro Commercial Co): Maintains 18V standoff and 20V breakdown voltage with enhanced power rating (15000W versus 5000W). Voltage clamping is 30.9V, representing a 1.7V increase over the main part specification. R-6 package configuration. Suitable for applications requiring higher transient energy absorption capacity with acceptable clamping voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can 5KP18CA replace SLD18-018-B in all applications? A: 5KP18CA is electrically equivalent with matching 18V standoff, 29.2V clamping, and 5000W power rating. The primary difference is operating temperature minimum (-50°C versus -55°C). Substitution is valid for applications operating above -50°C. Package compatibility (P600) is identical.

Q: What is the difference between 5KP18CA-TP and 5KP18CA? A: Both parts are manufactured by different suppliers (5KP18CA by Diotec, 5KP18CA-TP by Micro Commercial Co) with identical electrical specifications. The primary difference is packaging format: 5KP18CA is supplied in Tape & Reel, while 5KP18CA-TP is supplied in Cut Tape. Electrical performance and package case (P600 versus R-6) differ between manufacturers.

Q: When should 15KP18CA-TP be selected over 5KP18CA-TP? A: 15KP18CA-TP provides three times the peak pulse power rating (15000W versus 5000W) with a slightly higher clamping voltage (30.9V versus 29.2V). Selection depends on transient energy requirements. If the application experiences transient pulses exceeding 5000W, the 15KP18CA-TP is required. The 1.7V clamping voltage increase must be verified as acceptable for the protected circuit.

Q: Are package differences between P600 and R-6 significant for substitution? A: Both P600 and R-6 are axial through-hole packages. Physical dimensions and lead spacing differ. Substitution requires verification that the alternative package fits the PCB footprint and mounting holes. Electrical performance is independent of package designation.

Q: Do all substitute parts meet automotive qualification requirements? A: The main part SLD18-018-B carries AEC-Q101 automotive qualification. Substitute parts 5KP18CA, 5KP18CA-TP, and 15KP18CA-TP do not list AEC-Q101 qualification in provided specifications. For automotive applications requiring AEC-Q101 certification, qualification status must be verified with manufacturers before substitution.

Q: What is the impact of the -50°C lower operating limit on 5KP18CA? A: The 5KP18CA operating range is -50°C to 175°C versus -55°C to 175°C for SLD18-018-B. This represents a 5°C reduction in minimum operating temperature. Substitution is valid only for applications where ambient and junction temperatures remain above -50°C throughout operation.