3KP54-B Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The 3KP54-B is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This part operates with a 54V reverse standoff voltage and delivers 3000W peak pulse power with a maximum clamping voltage of 91.46V at peak pulse current. The 3KP54-B is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	54V
Voltage - Breakdown (Min)	56.84V
Voltage - Clamping (Max) @ Ipp	91.46V
Current - Peak Pulse (10/1000µs)	34.4A
Power - Peak Pulse	3000W
Operating Temperature Range	-55°C to 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 3KP54-B is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff: 54V (exact match required)
Voltage - Breakdown (Min): 56.84V to 60.3V (acceptable range)
Mounting Type: Through Hole (required)
Package / Case: P600 or R-6 Axial (mechanically compatible)
Unidirectional Channels: 1 (required)
Type: Zener (required)
Operating Temperature Range: -55°C to 175°C (required)

Power Rating Consideration: Substitute parts are grouped by peak pulse power capacity. The 3KP54-B operates at 3000W. Substitutes rated at 3000W, 5000W, or 15000W are electrically valid, as higher power ratings provide equivalent or superior transient suppression capability without compromising circuit protection.

Voltage Clamping Tolerance: The 3KP54-B specifies 91.46V maximum clamping voltage. Substitute parts with clamping voltages between 87.1V and 87.7V represent tighter clamping performance and are acceptable for applications requiring improved transient suppression.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status
3KP54-B	Littelfuse Inc.	54V	56.84V	91.46V	34.4A	3000W	P600, Axial	Obsolete
3KP54A-TP	Micro Commercial Co	54V	60V	87.1V	34.4A	3000W	R-6, Axial	Active
5KP54A-B	Littelfuse	54V	60V	87.1V	58.6A	5000W	P600, Axial	Active
5KP54A-TP	Micro Commercial Co	54V	60V	87.1V	—	5000W	R-6, Axial	Active
5KP54A-E3/54	Vishay General Semiconductor - Diodes Division	54V	60V	87.1V	57.4A	5000W	P600, Axial	Active
5KP54A-E3/73	Vishay General Semiconductor - Diodes Division	54V	60V	87.1V	57.4A	5000W	P600, Axial	Active
5KP54AHE3/54	Vishay General Semiconductor - Diodes Division	54V	60V	87.1V	57.4A	5000W	P600, Axial	Active
5KP54AHE3/73	Vishay General Semiconductor - Diodes Division	54V	60V	87.1V	57.4A	5000W	P600, Axial	Active
15KP54A-TP	Micro Commercial Co	54V	60V	87.5V	—	15000W	R-6, Axial	Active
15KPA54AE3/TR13	Microchip Technology	54V	60.3V	87.7V	172.2A	15000W	P600, Axial	Active

Engineering Selection Recommendations

Direct Replacement (Same Power Rating): The 3KP54A-TP (Micro Commercial Co) provides the most direct electrical equivalent with matching 3000W peak pulse power, 54V reverse standoff voltage, and identical peak pulse current of 34.4A. This part is active and ROHS3 compliant. Package compatibility requires verification: the 3KP54-B uses P600 axial packaging, while 3KP54A-TP uses R-6 axial packaging. Both are through-hole axial formats and are mechanically interchangeable in standard PCB layouts.

Enhanced Performance Substitutes (5000W Rating): The 5KP54A-B (Littelfuse), 5KP54A-TP (Micro Commercial Co), 5KP54A-E3/54, 5KP54A-E3/73, 5KP54AHE3/54, and 5KP54AHE3/73 (all Vishay) deliver 5000W peak pulse power with improved transient suppression capability. All maintain 54V reverse standoff voltage and are ROHS3 compliant. The Vishay variants (5KP54AHE3/54 and 5KP54AHE3/73) carry AEC-Q101 automotive qualification. These parts are suitable for applications requiring higher transient energy absorption without circuit redesign.

High-Power Substitutes (15000W Rating): The 15KP54A-TP (Micro Commercial Co) and 15KPA54AE3/TR13 (Microchip Technology) provide 15000W peak pulse power with 54V reverse standoff voltage. Both are active and ROHS3 compliant. The 15KPA54AE3/TR13 offers the highest peak pulse current (172.2A) and tightest clamping voltage (87.7V). These parts are specified for applications with severe transient environments or where design margin is critical.

Product Status Consideration: All identified substitutes carry Active product status, ensuring long-term availability and supply chain stability. The obsolete status of the 3KP54-B makes transition to an active substitute necessary for new production and ongoing component procurement.

Frequently Asked Questions (FAQ)

Q: Can I use a 5KP54A part as a direct replacement for the 3KP54-B? A: Yes. The 5KP54A series maintains the critical 54V reverse standoff voltage and through-hole axial mounting. The higher 5000W power rating provides equivalent or superior transient suppression. Verify PCB layout compatibility with the specific package variant (P600 or R-6).

Q: What is the difference between P600 and R-6 axial packages? A: Both are through-hole axial formats used for TVS diodes. P600 and R-6 are mechanically interchangeable in standard PCB footprints. Verify lead diameter and spacing with your PCB design specifications.

Q: Does the 3KP54A-TP have the same electrical performance as the 3KP54-B? A: The 3KP54A-TP matches the 3KP54-B in reverse standoff voltage (54V), peak pulse current (34.4A), and power rating (3000W). The clamping voltage is slightly lower (87.1V vs. 91.46V), providing improved transient suppression. Both operate across -55°C to 175°C.

Q: Are Vishay 5KP54AHE3 parts suitable for automotive applications? A: Yes. The 5KP54AHE3/54 and 5KP54AHE3/73 variants carry AEC-Q101 automotive qualification and are rated for automotive-grade reliability. These parts are ROHS3 compliant and suitable for automotive transient protection circuits.

Q: Why would I choose a 15000W part over a 3000W part? A: Higher power ratings provide greater transient energy absorption capability, extending component life in high-stress environments and improving circuit reliability margins. Selection depends on application transient severity and design requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All identified substitute parts carry ROHS3 compliance status, meeting environmental and regulatory requirements equivalent to the 3KP54-B.

Q: What is the inventory status of these substitutes? A: All substitute parts listed are in active production with confirmed new original inventory availability, ranging from 765 to 27,900 pieces across multiple suppliers and distributors.

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