SLD18U-017 Equivalent & Substitute Parts

Part Overview

The SLD18U-017 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in electronic circuits. This component features an 18V reverse standoff voltage with a 29.2V maximum clamping voltage and 174.7A peak pulse current capability. The device is classified as Active product status and carries AEC-Q101 automotive qualification, making it suitable for automotive and industrial applications requiring reliable surge protection. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and compliance certifications to ensure functional interchangeability in circuit designs.

Substiute Parts

SLD18U-017

Littelfuse Inc.In Stock: 1155SLD18U-017 Datasheet

Current PartRFQ

5KP18A

Diotec SemiconductorIn Stock: 42185KP18A Datasheet

DirectRFQ

5KP18A-TP

Micro Commercial CoIn Stock: 20485KP18A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLD18U-017 are qualified based on the following critical parameters that determine functional interchangeability:

• Voltage - Reverse Standoff (Typ): 18V
• Voltage - Clamping (Max) @ Ipp: 29.2V
• Power - Peak Pulse: 5000W
• Type: Zener, Unidirectional
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant

The identified substitutes (5KP18A and 5KP18A-TP) match these core electrical and mechanical parameters. Both maintain the same voltage protection characteristics, peak pulse power rating, and through-hole mounting configuration. All substitutes comply with ROHS3 requirements and are classified as Active product status, ensuring availability and continued support.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain Active product status, ensuring continued manufacturing support and component availability. The SLD18U-017 carries AEC-Q101 automotive qualification, which is the highest qualification level among the group. The 5KP18A and 5KP18A-TP substitutes do not list automotive qualification but are ROHS3 compliant and Active status.

For applications requiring automotive-grade components with AEC-Q101 certification, the SLD18U-017 remains the primary choice. For general-purpose industrial applications where automotive qualification is not mandated, the 5KP18A (Diotec) and 5KP18A-TP (Micro Commercial Co) provide equivalent electrical performance with identical voltage protection characteristics and power ratings.

The 5KP18A-TP operates across the same temperature range as the SLD18U-017 (-55°C to 175°C), while the 5KP18A operates from -50°C to 175°C, which may be a consideration for extreme low-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the 5KP18A be used as a direct replacement for the SLD18U-017?

A: The 5KP18A matches all critical electrical parameters (18V standoff, 29.2V clamping, 5000W peak pulse power) and mounting type (through-hole P600 axial package). However, the SLD18U-017 carries AEC-Q101 automotive qualification while the 5KP18A does not. Selection depends on whether automotive certification is required for your application.

Q: What is the difference between the 5KP18A and 5KP18A-TP?

A: Both parts share identical electrical specifications (18V standoff, 29.2V clamping, 5000W power rating). The primary differences are manufacturer (Diotec vs. Micro Commercial Co), packaging format (Tape & Reel vs. Cut Tape), and operating temperature range (5KP18A-TP matches the SLD18U-017 at -55°C to 175°C, while 5KP18A operates from -50°C to 175°C).

Q: Are all substitute parts ROHS3 compliant?

A: Yes, the SLD18U-017, 5KP18A, and 5KP18A-TP are all ROHS3 compliant, meeting environmental and hazardous substance restrictions.

Q: What is the significance of the P600 and R-6 package designations?

A: Both P600 and R-6 are axial through-hole package formats for TVS diodes. The SLD18U-017 uses P600 packaging, while the 5KP18A-TP uses R-6 packaging. Both are mechanically compatible with standard through-hole PCB layouts, though specific footprint verification is recommended during design integration.

Q: Can I use these parts interchangeably in high-temperature automotive applications?

A: The SLD18U-017 and 5KP18A-TP both support the full -55°C to 175°C operating range. The 5KP18A has a minimum operating temperature of -50°C. For applications requiring the full -55°C range, the SLD18U-017 or 5KP18A-TP are appropriate selections. For automotive applications, the SLD18U-017 with AEC-Q101 qualification is the recommended choice.