5KP170C-B Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The 5KP170C-B is a Littelfuse 5000W bidirectional Zener TVS diode designed for general-purpose transient voltage suppression applications. With a reverse standoff voltage of 170V and maximum clamping voltage of 288.75V, this component provides protection in through-hole P600 axial package configuration. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP170C-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	179.1V
Voltage - Clamping (Max) @ Ipp	288.75V
Power - Peak Pulse	5000W (5kW)
Mounting Type	Through Hole
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 5KP170C-B is determined by the following critical parameters:

Primary Substitution Criteria:

Reverse standoff voltage within the 170V specification
Bidirectional Zener type configuration
Through-hole axial mounting capability
Operating temperature range of -55°C to 175°C minimum
ROHS3 compliance

Substitution Groups:

Group 1: Direct Series Equivalents (5KP Series, P600 Package) Parts 5KP170CA and 5KP170CA-B maintain identical reverse standoff voltage (170V), same package (P600), and equivalent power rating (5000W). These differ only in packaging format (Cut Tape vs. Bulk) and represent the closest functional equivalents with active product status.

Group 2: Lower Power Alternatives (1.5KE Series, DO-201 Package) Parts 1.5KE180CA, 1.5KE200CA, and 1.5KE220CA provide reduced peak pulse power (1500W) in DO-201 axial package. These maintain comparable reverse standoff voltages (154V–185V) and clamping characteristics but operate at lower power dissipation levels.

Group 3: Reduced Power Alternatives (P4KE and P6KE Series) Parts P4KE180CA (400W) and P6KE200CA (600W) offer further power reduction with different package configurations (DO-204AL and DO-15 respectively). These are suitable for lower-energy transient suppression requirements.

Group 4: Alternative Manufacturers (Comchip Technology, Micro Commercial Co) Parts 1.5KE180CA-G, 1.5KE180CA-HF, and 1.5KE180CA-TP provide equivalent electrical characteristics from alternative suppliers with maintained compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
5KP170C-B	Littelfuse Inc.	170V	179.1V	288.75V	5000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP170CA	Littelfuse Inc.	170V	189V	275V	5000W	P600, Axial	Active	ROHS3 Compliant
5KP170CA-B	Littelfuse Inc.	170V	189V	275V	5000W	P600, Axial	Active	ROHS3 Compliant
1.5KE180CA	Taiwan Semiconductor Corporation	154V	171V	246V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
1.5KE200CA	Taiwan Semiconductor Corporation	171V	190V	274V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
1.5KE220CA	Taiwan Semiconductor Corporation	185V	209V	328V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
P4KE180CA	Taiwan Semiconductor Corporation	154V	171V	246V	400W	DO-204AL, Axial	Active	ROHS3 Compliant
P6KE200CA	Fairchild Semiconductor	171V	190V	274V	600W	DO-204AC, Axial	Active	Not specified
1.5KE180CA-G	Comchip Technology	154V	171V	246V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
1.5KE180CA-HF	Comchip Technology	154V	171V	246V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
1.5KE180CA-TP	Micro Commercial Co	154V	171V	246V	1500W	DO-201AE, Axial	Active	Not specified

Engineering Selection Recommendations

Primary Selection (Direct Replacement): 5KP170CA or 5KP170CA-B are the recommended primary substitutes. Both maintain identical reverse standoff voltage (170V), equivalent power rating (5000W), and P600 axial package configuration. Both parts carry active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Secondary Selection (Same Power Class, Alternative Package): 1.5KE180CA, 1.5KE200CA, and 1.5KE220CA from Taiwan Semiconductor Corporation provide equivalent 1500W power suppression in DO-201 axial packages. These are suitable when P600 package availability is constrained. All three maintain active status and ROHS3 compliance.

Tertiary Selection (Reduced Power Requirements): P4KE180CA and P6KE200CA are applicable only when circuit design permits lower peak pulse power dissipation (400W and 600W respectively). These represent power-reduced alternatives with different package formats.

Alternative Manufacturer Options: 1.5KE180CA-G, 1.5KE180CA-HF (Comchip Technology), and 1.5KE180CA-TP (Micro Commercial Co) provide equivalent electrical performance from alternative suppliers. 1.5KE180CA-TP includes automotive-grade qualification and telecom application certification.

Frequently Asked Questions (FAQ)

Q: Can 5KP170CA directly replace 5KP170C-B without circuit modification? A: Yes. Both parts maintain 170V reverse standoff voltage, 5000W peak pulse power, and P600 axial package. The primary difference is product status (active vs. obsolete) and minor clamping voltage variation (275V vs. 288.75V), which falls within normal design tolerance for TVS applications.

Q: What is the key difference between 5KP170CA and 1.5KE180CA? A: The 5KP170CA operates at 5000W peak pulse power in P600 package, while 1.5KE180CA operates at 1500W in DO-201 package. Selection depends on circuit power dissipation requirements and available board space for different package geometries.

Q: Are all substitute parts ROHS3 compliant? A: Most substitutes listed carry ROHS3 compliance. P6KE200CA and 1.5KE180CA-TP do not specify RoHS status in available documentation. Verify compliance requirements with your procurement specifications before selection.

Q: Can lower-power alternatives (P4KE, P6KE series) be used in high-energy transient environments? A: No. These parts are rated for 400W and 600W respectively, compared to the original 5000W specification. Use only when circuit analysis confirms transient energy levels remain within the lower power rating.

Q: What is the operating temperature difference between substitute options? A: Most parts operate -55°C to 175°C. Comchip Technology variants (1.5KE180CA-G, 1.5KE180CA-HF) operate -55°C to 150°C, providing 25°C lower maximum junction temperature. Verify thermal requirements before selection.

Q: Does package change from P600 to DO-201 affect circuit performance? A: Package change does not affect electrical performance but impacts PCB layout, lead length, and mechanical mounting. Both are through-hole axial configurations suitable for standard component placement. Verify footprint compatibility with existing board design.

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