5KP48-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP48-B is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole P600 axial package device provides 5000W peak pulse power handling with a 48V reverse standoff voltage rating. The 5KP48-B is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP48-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	48V
Voltage - Breakdown (Min)	50.49V
Voltage - Clamping (Max) @ Ipp	81.27V
Power - Peak Pulse	5000W (5kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 5KP48-B is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage of 48V ±tolerance
Power Handling: Peak pulse power of 5000W (5kW) minimum
Package Type: Through-hole axial configuration (P600 or equivalent mechanical form factor)
Unidirectional Operation: Single channel Zener-type TVS diode
Temperature Range: Operating range of -55°C to 175°C
Compliance: ROHS3 compliance required

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Mechanical Equivalents (P600 Package, 5kW Power Rating) These parts maintain identical package form factor and power rating with 48V standoff voltage specifications.

Category B - Functional Equivalents (Alternative Packages, Lower Power Ratings) These parts provide equivalent voltage protection but with different package types or reduced power ratings, suitable for applications with less stringent power dissipation requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Operating Temperature	RoHS Status
5KP48-B	Littelfuse Inc.	Obsolete	48V	50.49V	81.27V	5000W	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
5KP48A	Littelfuse Inc.	Active	48V	53.3V	77.4V	5000W	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
5KP48A-B	Littelfuse	Active	48V	53.3V	77.4V	5000W	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
5KP48AHE3/54	Vishay General Semiconductor - Diodes Division	Active	48V	53.3V	77.4V	5000W	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
5KP48E3/TR13	Microchip Technology	Active	48V	53.3V	85.5V	5000W	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
30KP48A-TP	Micro Commercial Co	Active	48V	53.6V	81.6V	30000W	R-6, Axial	-55°C ~ 175°C	ROHS3 Compliant
1.5KE47A	Taiwan Semiconductor Corporation	Active	40.2V	44.7V	64.8V	1500W	DO-201AA, Axial	-55°C ~ 175°C	ROHS3 Compliant
1.5KE51A	Meritek	Active	N/A	48.5V	70.1V	1500W	DO-201, Axial	-55°C ~ 175°C	N/A
P6KE51A	Fairchild Semiconductor	Active	N/A	N/A	N/A	N/A	N/A	N/A	N/A
P6KE56A-TP	Micro Commercial Co	Active	47.8V	53.2V	77V	600W	DO-204AC, Axial	-55°C ~ 175°C	N/A

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

The 5KP48A, 5KP48A-B, 5KP48AHE3/54, and 5KP48E3/TR13 are active products from established manufacturers with identical or superior electrical specifications. All maintain the P600 axial package form factor, 5000W power rating, 48V standoff voltage, and -55°C to 175°C operating temperature range. All are ROHS3 compliant. The 5KP48AHE3/54 carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Secondary Substitutes (Power-Rated Alternatives)

The 30KP48A-TP provides 30kW peak pulse power handling with identical voltage specifications and R-6 axial package configuration. This part is suitable for applications requiring enhanced power dissipation capability beyond the original 5kW rating.

Limited Substitutes (Reduced Power or Voltage Deviation)

The 1.5KE47A and 1.5KE51A provide reduced power ratings (1500W) with DO-201 axial packages. The 1.5KE47A operates at 40.2V standoff voltage, representing a voltage deviation from the 48V specification. These parts are suitable only for applications with lower power dissipation requirements and where voltage tolerance permits.

The P6KE56A-TP operates at 47.8V standoff voltage with 600W power rating and DO-15 package, representing significant deviations in both power and package form factor.

Frequently Asked Questions (FAQ)

Q: Can the 5KP48A directly replace the 5KP48-B?

A: Yes. The 5KP48A is an active product from Littelfuse Inc. with identical 48V standoff voltage, 5000W power rating, P600 axial package, and -55°C to 175°C operating temperature range. The primary difference is the clamping voltage specification (77.4V vs. 81.27V), which remains within acceptable protection parameters for general-purpose applications.

Q: What is the difference between 5KP48A and 5KP48A-B?

A: Both parts are electrically identical with 48V standoff voltage, 5000W power rating, and P600 package. The suffix "-B" indicates bulk packaging, while 5KP48A is supplied in cut tape. Selection depends on procurement and assembly requirements.

Q: Is the 30KP48A-TP a suitable replacement?

A: The 30KP48A-TP maintains 48V standoff voltage and axial configuration but uses an R-6 package instead of P600 and provides 30kW power rating. It is suitable for applications requiring higher power dissipation. Mechanical form factor differences must be verified for PCB compatibility.

Q: Can lower-power alternatives like 1.5KE47A be used?

A: The 1.5KE47A operates at 40.2V standoff voltage with 1500W power rating and DO-201 package. Substitution is limited to applications where the lower voltage rating and power handling are acceptable. Voltage tolerance and thermal design must be re-evaluated.

Q: What compliance certifications are critical for selection?

A: ROHS3 compliance is standard across active substitutes. The 5KP48AHE3/54 carries AEC-Q101 automotive qualification for applications requiring automotive-grade reliability. Verify compliance requirements for your specific application.

Q: Does package form factor affect substitution?

A: Yes. The original 5KP48-B uses P600 axial package. Direct mechanical replacements maintain P600 configuration. Alternatives with different packages (R-6, DO-201, DO-15) require PCB layout verification and may not be pin-compatible without mechanical adaptation.

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