SLD40-018-B Equivalent & Substitute Parts

Part Overview

The SLD40-018-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 40V reverse standoff voltage and provides 5000W peak pulse power dissipation. The part maintains Active product status and carries AEC-Q101 automotive qualification, making it suitable for demanding industrial and automotive applications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

SLD40-018-B

Littelfuse Inc.In Stock: 874SLD40-018-B Datasheet

Current PartRFQ

5KP40CA

Diotec SemiconductorIn Stock: 42335KP40CA Datasheet

DirectRFQ

5KP40CA-TP

Micro Commercial CoIn Stock: 14905KP40CA-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLD40-018-B are qualified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 40V
• Voltage - Clamping (Max) @ Ipp: 64.5V
• Power - Peak Pulse: 5000W
• Bidirectional Channels: 1
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant

The identified substitutes (5KP40CA and 5KP40CA-TP) meet these core electrical specifications and compliance requirements. Variations in peak pulse current (78A vs. 79.1A), packaging format (Tape & Reel vs. Bulk, Cut Tape vs. Bulk), and package case designation (P600 vs. R-6) do not prevent functional equivalence when the primary voltage and power ratings align.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain Active product status and ROHS3 compliance, supporting long-term availability and regulatory adherence. The SLD40-018-B carries AEC-Q101 automotive qualification, which is not explicitly stated for the substitute parts in the provided data. When automotive-grade qualification is a circuit requirement, the SLD40-018-B remains the primary selection. For general-purpose applications where automotive qualification is not mandated, the 5KP40CA and 5KP40CA-TP substitutes provide equivalent electrical performance at the specified voltage and power ratings. Package case differences (P600 vs. R-6) and packaging formats (Bulk, Tape & Reel, Cut Tape) do not affect electrical function and should be selected based on procurement and assembly workflow requirements.

Frequently Asked Questions (FAQ)

Q: Can 5KP40CA replace SLD40-018-B in automotive applications?

A: The 5KP40CA meets the core electrical specifications (40V standoff, 64.5V clamping, 5000W power). However, the SLD40-018-B carries AEC-Q101 automotive qualification. Use 5KP40CA only if automotive qualification is not a circuit requirement.

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

A: Both are axial through-hole packages for TVS diodes. P600 and R-6 designate different physical case geometries. Selection depends on PCB footprint design and assembly equipment compatibility. Electrical performance is equivalent.

Q: Why does 5KP40CA-TP show no peak pulse current value?

A: The provided data does not include the peak pulse current specification for 5KP40CA-TP. The part meets the 5000W power rating and 64.5V clamping voltage, which are the primary substitution criteria. Consult the manufacturer datasheet for complete current specifications if required for detailed circuit analysis.

Q: Are there packaging format restrictions for substitution?

A: No. Bulk, Tape & Reel (TR), and Cut Tape (CT) packaging formats are procurement and assembly options only. They do not affect electrical equivalence. Select based on your supply chain and manufacturing process requirements.

Q: What is the temperature range difference between these parts?

A: SLD40-018-B and 5KP40CA-TP operate from -55 to 175°C. The 5KP40CA operates from -50 to 175°C. For applications requiring operation below -50°C, use SLD40-018-B or 5KP40CA-TP.