5KP180-B Equivalent & Substitute Parts

Part Overview

The 5KP180-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional zener diode features a 180V reverse standoff voltage with a 306.6V maximum clamping voltage and 5000W peak pulse power rating in a through-hole P600 axial package. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active product lines that maintain electrical and mechanical compatibility for circuit protection applications.

Key Parameters

Parameter	5KP180-B
Manufacturer	Littelfuse Inc.
Type	Zener TVS Diode
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	180V
Voltage - Breakdown (Min)	189.45V
Voltage - Clamping (Max) @ Ipp	306.6V
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 5KP180-B is determined by the following critical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 180V nominal
Unidirectional operation (single channel)
Through-hole axial mounting configuration
Zener diode type for transient suppression
General-purpose application compatibility
ROHS3 compliance

Acceptable Variation Ranges:

Clamping voltage: 292V to 328V (within transient protection envelope)
Peak pulse power: 600W to 5000W (lower ratings acceptable for reduced energy events)
Operating temperature: -50°C to -55°C minimum; 175°C maximum
Package variants: P600 (5mm lead spacing), DO-201 (DO-27), DO-15 (DO-204AC) axial packages

Substitutes are grouped by electrical performance tier and package type. Direct replacements maintain 5000W power rating and P600 packaging. Secondary alternatives offer reduced power dissipation (1500W or 600W) with different package geometries but equivalent voltage protection characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
5KP180-B	Littelfuse Inc.	180V	306.6V	5000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP180A	Littelfuse Inc.	180V	292V	5000W	P600, Axial	Active	ROHS3 Compliant
5KP180A-B	Littelfuse Inc.	180V	292V	5000W	P600, Axial	Active	ROHS3 Compliant
1.5KE180A	Taiwan Semiconductor Corporation	154V	246V	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
1.5KE200A	Taiwan Semiconductor Corporation	171V	274V	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
1.5KE220A	Taiwan Semiconductor Corporation	185V	328V	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
P6KE180A	Fairchild Semiconductor	154V	246V	600W	DO-204AC, DO-15, Axial	Active	Not specified
P6KE200A	Fairchild Semiconductor	171V	274V	600W	DO-204AC, DO-15, Axial	Active	Not specified
P6KE220A	Fairchild Semiconductor	185V	328V	600W	DO-204AC, DO-15, Axial	Active	Not specified

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended): 5KP180A and 5KP180A-B are the primary substitutes. Both are active products from Littelfuse Inc. with identical 180V reverse standoff voltage, 5000W peak pulse power, and P600 axial packaging. The clamping voltage of 292V is within acceptable transient protection parameters. Both maintain ROHS3 compliance and -55°C to 175°C operating temperature range. 5KP180A is available in cut tape packaging with 300,400 units in stock; 5KP180A-B is available in bulk with 958 units in stock.

Tier 2 - Voltage-Matched Alternatives (1500W Class): 1.5KE180A, 1.5KE200A, and 1.5KE220A from Taiwan Semiconductor Corporation are active products with reduced power dissipation (1500W) and different package geometry (DO-201). These parts maintain through-hole axial mounting and ROHS3 compliance. 1.5KE180A provides the closest voltage match at 154V standoff with 246V clamping. 1.5KE200A and 1.5KE220A offer higher voltage ratings (171V and 185V standoff respectively) suitable for applications requiring elevated protection thresholds. All three are in active production with substantial inventory availability.

Tier 3 - Reduced Power Alternatives (600W Class): P6KE180A, P6KE200A, and P6KE220A from Fairchild Semiconductor are active products with 600W peak pulse power and DO-15 (DO-204AC) axial packaging. These parts are suitable for lower-energy transient events and space-constrained applications. P6KE180A matches the 154V standoff voltage with 246V clamping. P6KE200A and P6KE220A provide 171V and 185V standoff ratings respectively. All maintain through-hole mounting and general-purpose application compatibility.

Selection should prioritize Tier 1 substitutes for direct electrical and mechanical compatibility. Tier 2 and Tier 3 alternatives are acceptable where reduced power dissipation requirements or package constraints permit.

Frequently Asked Questions (FAQ)

Q: Can 5KP180A directly replace 5KP180-B without circuit modification? A: Yes. Both parts share identical 180V reverse standoff voltage, 5000W peak pulse power rating, and P600 axial through-hole packaging. The 292V clamping voltage of 5KP180A is within acceptable transient suppression parameters for the 306.6V specification of 5KP180-B.

Q: What is the difference between 5KP180A and 5KP180A-B? A: Both are electrically identical with 180V standoff, 292V clamping, and 5000W power rating in P600 packaging. The difference is packaging format: 5KP180A is supplied in cut tape; 5KP180A-B is supplied in bulk. Selection depends on procurement and assembly requirements.

Q: Can 1.5KE series parts substitute for 5KP180-B? A: 1.5KE series parts are functionally compatible for transient voltage suppression but with reduced power dissipation (1500W versus 5000W) and different package geometry (DO-201 versus P600). They are suitable where circuit energy levels are lower and package space permits axial lead reconfiguration. 1.5KE180A, 1.5KE200A, and 1.5KE220A provide voltage ratings spanning 154V to 185V standoff.

Q: Are P6KE series parts suitable replacements? A: P6KE series parts provide transient suppression with 600W power dissipation and DO-15 packaging. They are acceptable for applications with lower transient energy requirements and where smaller package geometry is advantageous. Voltage ratings (154V to 185V standoff) align with 5KP180-B protection envelope.

Q: What packaging considerations apply when substituting with 1.5KE or P6KE series? A: 5KP180-B uses P600 axial packaging (5mm lead spacing). 1.5KE series uses DO-201 (DO-27) axial packaging with different lead spacing. P6KE series uses DO-15 (DO-204AC) axial packaging with smaller form factor. PCB layout and lead hole spacing must accommodate the selected package geometry. All maintain through-hole mounting compatibility.

Q: Are all substitute parts ROHS3 compliant? A: 5KP180A, 5KP180A-B, and all 1.5KE series parts are confirmed ROHS3 compliant. P6KE series compliance status is not specified in available documentation.

Q: Which substitute offers the best inventory availability? A: P6KE200A has the highest inventory level at 165,200 units. 5KP180A offers 300,400 units in cut tape format. 1.5KE200A and 1.5KE220A provide 14,154 and 4,200 units respectively.

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