SLD40U-017-B Equivalent & Substitute Parts

Part Overview

The SLD40U-017-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in electronic circuits. This through-hole P600 axial package device operates across an extended temperature range of -55°C to 175°C and carries AEC-Q101 automotive qualification. The part is currently active in production with 822 units in stock inventory. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter set.

Substiute Parts

SLD40U-017-B

Littelfuse Inc.In Stock: 890SLD40U-017-B Datasheet

Current PartRFQ

5KP40A

Diotec SemiconductorIn Stock: 34645KP40A Datasheet

DirectRFQ

5KP40A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 17535KP40A-E3/54 Datasheet

MFR RecommendedRFQ

5KP40A-TP

Micro Commercial CoIn Stock: 15365KP40A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SLD40U-017-B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 40V
• Voltage - Clamping (Max) @ Ipp: 64.5V
• Power - Peak Pulse: 5000W
• Mounting Type: Through Hole
• Package / Case: P600 or R-6 Axial
• Unidirectional Channels: 1

The three identified substitute parts maintain these core electrical specifications. Variations in peak pulse current (77.5A to 79.1A) and operating temperature ranges remain within acceptable tolerance for this product category. Package variants (P600 vs. R-6) are mechanically compatible for through-hole axial mounting applications.

Parameter Comparison

Engineering Selection Recommendations

5KP40A (Diotec Semiconductor): This substitute maintains full electrical equivalence with 78A peak pulse current and identical voltage specifications. ROHS3 compliance and through-hole P600 axial packaging provide direct mechanical compatibility. Operating temperature range of -50°C to 175°C covers most applications, with the exception of systems requiring the full -55°C lower limit. Inventory availability is high at 3400 units.

5KP40A-E3/54 (Vishay General Semiconductor - Diodes Division): This TransZorb® series part delivers 77.5A peak pulse current with matching voltage and power ratings. The part maintains -55°C to 175°C operating range and P600 axial packaging. However, RoHS non-compliance status must be evaluated against system-level requirements. This substitute is suitable for applications where RoHS compliance is not mandated.

5KP40A-TP (Micro Commercial Co): This variant uses R-6 axial packaging, which is mechanically compatible with P600 through-hole mounting. Electrical specifications match the main part with 5000W peak pulse power and 40V standoff voltage. ROHS3 compliance and full -55°C to 175°C operating range are maintained. Peak pulse current is not specified in available data. Inventory availability is 1517 units.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP40A-TP with R-6 packaging as a direct replacement for SLD40U-017-B with P600 packaging?

A: Yes. Both R-6 and P600 are axial through-hole package formats with compatible mechanical footprints for standard PCB mounting. Electrical performance is equivalent across the specified parameters.

Q: What is the significance of the -50°C lower operating temperature limit on the 5KP40A compared to the -55°C specification of the main part?

A: The 5KP40A operates from -50°C to 175°C, while the SLD40U-017-B operates from -55°C to 175°C. Selection depends on system requirements. If your application requires operation below -50°C, the 5KP40A is not suitable.

Q: Why is 5KP40A-E3/54 marked as RoHS non-compliant?

A: RoHS compliance status is determined by material composition and manufacturing processes. The 5KP40A-E3/54 does not meet ROHS3 standards. Use this substitute only in applications where RoHS compliance is not a regulatory or contractual requirement.

Q: Are all three substitutes electrically equivalent to the SLD40U-017-B?

A: All three substitutes maintain the critical electrical parameters: 40V reverse standoff voltage, 64.5V clamping voltage, and 5000W peak pulse power. Peak pulse current values range from 77.5A to 79.1A, representing less than 2% variation and remaining within acceptable tolerance for TVS diode applications.

Q: Which substitute offers the best inventory availability?

A: The 5KP40A from Diotec Semiconductor has the highest inventory at 3400 units, compared to 1694 units for the Vishay part and 1517 units for the MCC part.