5KP45A-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP45A-B is an active Littelfuse Inc. Transient Voltage Suppressor (TVS) diode designed for general-purpose transient protection applications. This unidirectional zener TVS diode features a 45V reverse standoff voltage with a 72.7V maximum clamping voltage and 70.2A peak pulse current capability. The device is housed in a P600 axial through-hole package and is ROHS3 compliant with unlimited moisture sensitivity rating. Substitute parts are identified based on electrical parameter compatibility and mechanical package interchangeability within the TVS diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	45	V
Voltage - Breakdown (Min)	50	V
Voltage - Clamping (Max) @ Ipp	72.7	V
Current - Peak Pulse (10/1000µs)	70.2	A
Power - Peak Pulse	5000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	P600, Axial	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitute parts for the 5KP45A-B are categorized based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 40.2V to 45V
Voltage - Clamping (Max) @ Ipp: 64.8V to 72.7V
Current - Peak Pulse: 21.7A to 70.2A
Power - Peak Pulse: 1500W to 5000W
Mounting Type: Through Hole
Package Type: Axial configuration (P600, DO-201AA, DO-27, R-6)
Type: Zener unidirectional TVS diode
Operating Temperature: -55°C to 175°C

Grouping Logic:

Group 1 (Direct Packaging Equivalents): Parts with identical P600 package and matching electrical specifications
Group 2 (Alternative Axial Packages): Parts with different axial package designations (DO-201, R-6) but compatible electrical parameters
Group 3 (Lower Power Rating Alternatives): Parts with reduced peak pulse power (1500W) suitable for applications with lower transient energy requirements

Parameter Comparison

Parameter	5KP45A-B (Main)	5KP45A	5KP45A-TP	1.5KE47A	1.5KE51A	P6KE51A
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	Taiwan Semiconductor Corporation	Meritek	Fairchild Semiconductor
Voltage - Reverse Standoff (Typ)	45V	45V	45V	40.2V	-	-
Voltage - Breakdown (Min)	50V	50V	50V	44.7V	48.5V	-
Voltage - Clamping (Max) @ Ipp	72.7V	72.7V	72.7V	64.8V	70.1V	-
Current - Peak Pulse (10/1000µs)	70.2A	70.2A	-	24A	21.7A	-
Power - Peak Pulse	5000W	5000W	5000W	1500W	1500W	-
Operating Temperature	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	P600, Axial	P600, Axial	R-6, Axial	DO-201AA, DO-27, Axial	Axial	-
Type	Zener	Zener	Zener	Zener	Zener	-
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	-

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Mechanical Specifications):

The 5KP45A (Littelfuse Inc., Cut Tape packaging) and 5KP45A-TP (Micro Commercial Co, Cut Tape packaging) are direct electrical equivalents to the 5KP45A-B. Both maintain identical voltage ratings (45V reverse standoff, 72.7V clamping), peak pulse current (70.2A), and power dissipation (5000W). All three parts are ROHS3 compliant with MSL 1 rating. The primary difference is packaging format: 5KP45A-B is supplied in Bulk, 5KP45A in Cut Tape, and 5KP45A-TP in Cut Tape. These parts are mechanically and electrically interchangeable for through-hole PCB assembly applications.

Alternative Substitutes (Reduced Power Rating):

The 1.5KE47A (Taiwan Semiconductor Corporation) and 1.5KE51A (Meritek) are lower-power alternatives with 1500W peak pulse rating versus 5000W for the main part. These devices operate within compatible voltage ranges (40.2V to 48.5V reverse standoff, 64.8V to 70.1V clamping) and maintain the same operating temperature range (-55°C to 175°C). Peak pulse current is reduced to 21.7A to 24A. These substitutes are suitable for applications with lower transient energy requirements and are ROHS3 compliant with MSL 1 rating.

Limited Data Availability:

The P6KE51A (Fairchild Semiconductor) is listed as a manufacturer-recommended substitute but contains insufficient electrical parameter data in the provided specifications for detailed compatibility assessment. This part should be cross-referenced with the manufacturer's datasheet before selection.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP45A or 5KP45A-TP as direct replacements for 5KP45A-B?

A: Yes. Both parts are electrical and mechanical equivalents with identical voltage ratings, peak pulse current, and power dissipation. The difference is packaging format (Bulk versus Cut Tape). All three are ROHS3 compliant with MSL 1 rating and suitable for through-hole assembly.

Q: What is the difference between the 5KP45A-B and the 1.5KE47A or 1.5KE51A?

A: The primary difference is power dissipation capability. The 5KP45A-B handles 5000W peak pulse power, while the 1.5KE series handles 1500W. The 1.5KE series also has lower peak pulse current (21.7A to 24A versus 70.2A). Voltage ratings are similar but not identical. Use the 1.5KE series only if your application requires lower transient energy protection.

Q: Are the different axial package types (P600, DO-201, R-6) mechanically interchangeable?

A: All listed substitute parts use axial through-hole packages suitable for PCB mounting. However, physical dimensions vary between P600, DO-201AA, DO-27, and R-6 packages. Verify PCB footprint compatibility before substitution. Consult package datasheets for exact lead spacing and body dimensions.

Q: Do all substitute parts meet the same compliance standards?

A: The 5KP45A, 5KP45A-TP, and 1.5KE47A are confirmed ROHS3 compliant with MSL 1 (Unlimited) rating. The 1.5KE51A has MSL 1 rating but ROHS status is not specified in the provided data. The P6KE51A has insufficient compliance data. Verify compliance documentation with the supplier before final selection.

Q: What is the inventory status of these substitute parts?

A: 5KP45A-B: 886 Pcs; 5KP45A: 3006 Pcs; 5KP45A-TP: 1215 Pcs; 1.5KE47A: 36829 Pcs; 1.5KE51A: 1529 Pcs; P6KE51A: 18576 Pcs. Inventory levels are subject to change. Confirm availability with your supplier.

Q: Can I substitute a lower-power TVS diode in a design originally specified for 5KP45A-B?

A: Only if your circuit analysis confirms that the lower peak pulse power (1500W) and reduced peak pulse current (21.7A to 24A) are sufficient for the transient protection requirements. The 1.5KE series is suitable for applications with lower energy transients. Consult your circuit design specifications and transient source characteristics before substitution.

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