5KP12-B Equivalent & Substitute Parts

Part Overview

The 5KP12-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection applications. This component features a 12V reverse standoff voltage with a 20.9V maximum clamping voltage and 5000W peak pulse power rating in a through-hole P600 axial package. The 5KP12-B is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

5KP12-B

LittelfuseIn Stock: 12025KP12-B Datasheet

Current PartRFQ

5KP12A

Littelfuse Inc.In Stock: 45015KP12A Datasheet

DirectRFQ

5KP12A-B

Littelfuse Inc.In Stock: 12115KP12A-B Datasheet

DirectRFQ

SLD12U-017-B

Littelfuse Inc.In Stock: 1171SLD12U-017-B Datasheet

MFR RecommendedRFQ

5KP12E3/TR13

Microchip TechnologyIn Stock: 10465KP12E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5KP12-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 12V (exact match required)
• Unidirectional Channels: 1 (single channel configuration)
• Power - Peak Pulse: 5000W (5kW) (exact match required)
• Mounting Type: Through Hole (mechanical compatibility)
• Package / Case: P600, Axial (physical form factor)
• Operating Temperature Range: -55°C ~ 175°C (TJ) (thermal compatibility)
• Type: Zener (device technology)

Substitute parts must maintain identical standoff voltage, peak pulse power rating, and package configuration. Variations in clamping voltage (within the same voltage class) and peak pulse current are acceptable provided the core electrical protection characteristics remain functionally equivalent for the intended application.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status, Littelfuse Manufacturer)

The 5KP12A-B and 5KP12A are direct functional equivalents to the obsolete 5KP12-B. Both maintain the 12V reverse standoff voltage, 5000W peak pulse power rating, and P600 axial through-hole package. The 5KP12A-B is supplied in bulk packaging, while the 5KP12A is available in cut tape format. Both are ROHS3 compliant and carry REACH Unaffected status. The primary difference is clamping voltage: 5KP12A variants clamp at 19.9V compared to the original 20.9V specification. This 1V reduction remains within acceptable transient suppression tolerances for general-purpose applications.

Manufacturer-Recommended Substitute (Automotive Grade)

The SLD12U-017-B is a Littelfuse manufacturer-recommended substitute with automotive-grade qualification (AEC-Q101). It maintains identical electrical specifications to the 5KP12A-B (12V standoff, 19.9V clamping, 5000W peak pulse) and P600 axial package configuration. This part is suitable for applications requiring automotive-grade component certification.

Alternative Substitute (Cross-Manufacturer)

The 5KP12E3/TR13, manufactured by Microchip Technology, provides functional equivalence with a 22V maximum clamping voltage and 227A peak pulse current. While the clamping voltage is 2.1V higher than the original specification, this part maintains the 12V standoff voltage, 5000W peak pulse power, and P600 axial package. This option is available in tape and reel packaging and is ROHS3 compliant with REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 5KP12-B with 5KP12A-B?

A: Yes. Both parts share identical reverse standoff voltage (12V), peak pulse power (5000W), operating temperature range (-55°C to 175°C), and P600 axial through-hole package. The 5KP12A-B is active and in stock, making it the primary replacement for the obsolete 5KP12-B. The clamping voltage difference (19.9V vs. 20.9V) is within acceptable tolerance for general-purpose transient suppression.

Q: What is the difference between 5KP12A and 5KP12A-B?

A: Both parts are electrically identical with matching 12V standoff voltage, 19.9V clamping voltage, and 5000W peak pulse power. The difference is packaging: 5KP12A is supplied in cut tape (CT) format for automated assembly, while 5KP12A-B is supplied in bulk. Select based on your procurement and assembly requirements.

Q: Is SLD12U-017-B suitable for automotive applications?

A: Yes. The SLD12U-017-B carries AEC-Q101 automotive qualification and is designated as automotive-grade. It maintains the same electrical specifications as 5KP12A-B and is suitable for automotive transient voltage protection circuits.

Q: Why does 5KP12E3/TR13 have a higher clamping voltage (22V)?

A: The 5KP12E3/TR13 is manufactured by Microchip Technology and exhibits a 22V maximum clamping voltage compared to the 20.9V original specification. This 2V variance remains within the same voltage protection class and is acceptable for general-purpose applications. The part maintains the critical 12V standoff voltage and 5000W peak pulse power rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (5KP12A-B, 5KP12A, SLD12U-017-B, and 5KP12E3/TR13) are ROHS3 compliant and suitable for applications requiring environmental compliance.

Q: Can I use these substitutes in existing PCB designs without modification?

A: Yes. All substitute parts use the P600 axial through-hole package with identical mechanical dimensions and pin configuration. No PCB layout modifications are required for direct substitution.