3KP150-B Equivalent & Substitute Parts

Part Overview

The 3KP150-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse, rated for 150V reverse standoff voltage with a 255.15V maximum clamping voltage at 12.3A peak pulse current. This component is designed for general-purpose transient voltage suppression in through-hole P600 axial package configuration. The 3KP150-B is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Suitable alternatives maintain the 150V standoff voltage specification while offering improved performance characteristics or active product status.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	150V
Voltage - Breakdown (Min)	158.4V
Voltage - Clamping (Max) @ Ipp	255.15V
Current - Peak Pulse (10/1000µs)	12.3A
Power - Peak Pulse	3000W (3kW)
Type	Zener
Unidirectional Channels	1
Mounting Type	Through Hole
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 3KP150-B are selected based on the following critical parameters that determine functional equivalence:

Voltage - Reverse Standoff: 150V (all substitutes maintain this specification)
Type: Zener, unidirectional configuration
Mounting Type: Through Hole
Operating Temperature Range: -55°C ~ 175°C (TJ)
RoHS3 Compliance: Required for environmental and regulatory compatibility

Substitutes are grouped into two categories based on package configuration and power rating:

Category 1: P600 Axial Package (Direct Package Match)

5KP150A-B (Littelfuse, Active)
5KP150A-E3/54 (Vishay, Active)

Category 2: R-6 Axial Package (Alternative Package)

5KP150A-TP (Micro Commercial Co, Active)
30KP150A-TP (Micro Commercial Co, Active)
BZW50-150 (STMicroelectronics, Active)

Category 3: Higher Power Rating (Microchip)

15KPA150AE3/TR13 (Microchip Technology, Active)

All substitutes maintain the 150V reverse standoff voltage and general-purpose transient suppression application profile. Differences in clamping voltage, peak pulse current, and power dissipation capacity reflect design variations within the 150V TVS diode family.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	RoHS Status
3KP150-B	Littelfuse	Obsolete	150V	255.15V	12.3A	3000W (3kW)	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
5KP150A-B	Littelfuse Inc.	Active	150V	243V	21A	5000W (5kW)	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
5KP150A-E3/54	Vishay General Semiconductor - Diodes Division	Active	150V	243V	20.6A	5000W (5kW)	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
5KP150A-TP	Micro Commercial Co	Active	150V	243V	—	5000W (5kW)	R-6, Axial	-55°C ~ 175°C	ROHS3 Compliant
30KP150A-TP	Micro Commercial Co	Active	150V	233.4V	—	30000W (30kW)	R-6, Axial	-55°C ~ 175°C	ROHS3 Compliant
15KPA150AE3/TR13	Microchip Technology	Active	150V	241.9V	62.4A	15000W (15kW)	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant
BZW50-150	STMicroelectronics	Active	150V	343V	175A (8/20µs)	5000W (5kW)	R-6, Axial	—	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (P600 Package Compatibility): The 5KP150A-B and 5KP150A-E3/54 are the primary substitutes for the 3KP150-B, both maintaining P600 axial package configuration. Both parts are active products with ROHS3 compliance and identical operating temperature ranges. The 5KP150A-B offers higher peak pulse current (21A) and power dissipation (5kW) compared to the original 3KP150-B (12.3A, 3kW), providing improved transient suppression capability within the same package footprint. The 5KP150A-E3/54 from Vishay delivers comparable performance with 20.6A peak pulse current and 5kW power rating.

For Enhanced Performance (Higher Power Dissipation): The 15KPA150AE3/TR13 from Microchip Technology maintains P600 package compatibility while providing significantly higher peak pulse current (62.4A) and power dissipation (15kW). This option is suitable for applications requiring greater transient energy absorption.

For Alternative Package Configurations (R-6 Axial): The 5KP150A-TP and 30KP150A-TP from Micro Commercial Co, and BZW50-150 from STMicroelectronics offer R-6 axial package alternatives. The 30KP150A-TP provides the highest power dissipation rating (30kW) among all substitutes. The BZW50-150 features the highest peak pulse current specification (175A at 8/20µs pulse width) and includes capacitance data (1700pF @ 1MHz).

All substitute parts maintain the 150V reverse standoff voltage specification and are ROHS3 compliant, ensuring regulatory compatibility with the original 3KP150-B.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP150A-B as a direct replacement for 3KP150-B? A: Yes. The 5KP150A-B maintains the same 150V reverse standoff voltage, P600 axial package configuration, and operating temperature range (-55°C ~ 175°C). The 5KP150A-B offers higher peak pulse current (21A vs. 12.3A) and power dissipation (5kW vs. 3kW), making it a functionally superior substitute with improved transient suppression capability.

Q: What is the difference between P600 and R-6 package options? A: P600 and R-6 are both axial through-hole package configurations for TVS diodes. The primary difference lies in physical dimensions and lead spacing. P600 is the original package for the 3KP150-B. R-6 alternatives (5KP150A-TP, 30KP150A-TP, BZW50-150) provide equivalent electrical performance but require PCB layout verification to confirm mechanical compatibility.

Q: Why does BZW50-150 have a higher clamping voltage (343V) than the 3KP150-B (255.15V)? A: Clamping voltage variation within the 150V TVS diode family reflects different internal design parameters and peak pulse current specifications. BZW50-150 is rated for 175A peak pulse current (8/20µs pulse width), compared to 3KP150-B at 12.3A (10/1000µs). Higher peak pulse current capability typically results in higher clamping voltage at rated current. Selection should be based on application transient waveform characteristics and circuit protection requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed (5KP150A-B, 5KP150A-E3/54, 5KP150A-TP, 30KP150A-TP, 15KPA150AE3/TR13, and BZW50-150) are ROHS3 compliant, matching the environmental compliance status of the original 3KP150-B.

Q: What is the significance of the 3KP150-B being classified as obsolete? A: Obsolete status indicates that Littelfuse has discontinued production of the 3KP150-B. Active substitute parts ensure continued availability for new designs and production requirements. All recommended substitutes maintain equivalent electrical specifications and are currently in active production.

Q: Can I use 30KP150A-TP for applications requiring only 3kW power dissipation? A: Yes. The 30KP150A-TP is rated for 30kW peak pulse power, which exceeds the 3kW requirement of the original 3KP150-B. Higher power rating provides additional design margin and transient suppression capability. However, verify that the R-6 package configuration is mechanically compatible with your PCB layout, as it differs from the original P600 package.

Q: What is the difference between 10/1000µs and 8/20µs pulse width specifications? A: These represent different standard test pulse waveforms used to characterize TVS diode performance. The 10/1000µs waveform (used for 3KP150-B, 5KP150A series) represents a slower transient event, while the 8/20µs waveform (used for BZW50-150) represents a faster transient. Peak pulse current values are specific to their respective waveforms and are not directly comparable between different pulse width standards.

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