5KP18C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP18C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This part operates with an 18V reverse standoff voltage and 5000W peak pulse power rating in a through-hole P600 axial package. The 5KP18C is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	18V
Voltage - Breakdown (Min)	18.95V
Voltage - Clamping (Max) @ Ipp	30.66V
Power - Peak Pulse	5000W (5kW)
Bidirectional Channels	1
Type	Zener
Mounting Type	Through Hole
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 5KP18C is determined by the following critical parameters:

Voltage - Reverse Standoff: 18V (all substitutes match)
Power - Peak Pulse: 5000W minimum (primary rating constraint)
Bidirectional Channels: 1 (single channel requirement)
Mounting Type: Through Hole (mechanical compatibility)
Package compatibility: P600 or R-6 axial packages (both are through-hole axial formats)
Operating Temperature Range: -55°C to 175°C (all substitutes meet or exceed)
RoHS3 Compliance: Required for all substitutes

The substitute parts listed below meet these core electrical and mechanical requirements. Variations in voltage clamping characteristics (29.2V to 32.2V) and peak pulse current ratings remain within acceptable tolerance ranges for general-purpose transient suppression applications.

Parameter Comparison

Parameter	5KP18C (Littelfuse)	5KP18CA (Diotec)	SLD18-018-B (Littelfuse)	5KP18CA-TP (MCC)	15KP18CA-TP (MCC)	5KP18CE3/TR13 (Microchip)
Voltage - Reverse Standoff (Typ)	18V	18V	18V	18V	18V	18V
Voltage - Breakdown (Min)	18.95V	20V	20V	20V	20V	20V
Voltage - Clamping (Max) @ Ipp	30.66V	29.2V	29.2V	29.2V	30.9V	32.2V
Power - Peak Pulse	5000W	5000W	5000W	5000W	15000W	5000W
Bidirectional Channels	1	1	1	1	1	1
Operating Temperature	-55°C ~ 175°C	-50°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Package / Case	P600, Axial	P600, Axial	P600, Axial	R-6, Axial	R-6, Axial	P600, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, providing long-term availability compared to the obsolete 5KP18C.

For applications requiring identical package geometry and electrical characteristics, 5KP18CA (Diotec) and 5KP18CE3/TR13 (Microchip) are direct P600 package equivalents with matching 5000W power ratings.

SLD18-018-B (Littelfuse) offers automotive-grade qualification (AEC-Q101) and extended temperature range matching the original part, making it suitable for automotive and industrial applications requiring higher reliability standards.

5KP18CA-TP and 15KP18CA-TP (Micro Commercial Co) use the R-6 axial package, which is mechanically compatible with P600 footprints in through-hole applications. The 15KP18CA-TP provides enhanced power dissipation at 15000W, offering design margin for applications with higher transient stress.

Selection should prioritize active product status and compliance certifications. Package selection (P600 versus R-6) depends on PCB layout constraints and mechanical mounting requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP18CA-TP or 15KP18CA-TP (R-6 package) as direct replacements for 5KP18C (P600 package)?

A: Yes. Both R-6 and P600 are through-hole axial packages with compatible lead spacing for standard PCB layouts. Mechanical fit and electrical performance are equivalent for general-purpose applications. Verify PCB hole spacing if custom layouts are used.

Q: What is the difference between the 5KP18CA-TP and 15KP18CA-TP?

A: Both parts share identical voltage ratings (18V reverse standoff, 20V breakdown minimum). The primary difference is power dissipation: 5KP18CA-TP is rated at 5000W, while 15KP18CA-TP is rated at 15000W. The 15KP18CA-TP provides greater transient energy absorption capacity for high-stress applications.

Q: Why does SLD18-018-B have automotive qualification (AEC-Q101)?

A: SLD18-018-B is manufactured to automotive-grade standards, ensuring enhanced reliability testing and traceability. This qualification is relevant only if your application requires automotive compliance. For general-purpose applications, non-automotive equivalents are functionally suitable.

Q: Are all substitutes compatible with the original 5KP18C operating temperature range?

A: The 5KP18C operates from -55°C to 175°C. All substitutes meet or exceed this range. 5KP18CA (Diotec) has a minimum operating temperature of -50°C, which is acceptable for most applications but should be verified if operation below -50°C is required.

Q: What is the significance of voltage clamping variations (29.2V to 32.2V)?

A: Voltage clamping represents the maximum voltage across the TVS diode during transient suppression. Variations within this range (29.2V to 32.2V) are acceptable for general-purpose protection. Select parts based on your circuit's maximum allowable clamping voltage. Lower clamping voltages provide tighter protection; higher values offer more design margin.

Q: Can I substitute the 5KP18C in existing designs without PCB modifications?

A: Yes, for P600 package substitutes (5KP18CA, SLD18-018-B, 5KP18CE3/TR13). R-6 package substitutes (5KP18CA-TP, 15KP18CA-TP) are mechanically compatible with standard through-hole layouts but should be verified against your specific PCB design if custom hole spacing is used.

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