5KP40CA-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 5KP40CA-B is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole P600 axial package component operates across a temperature range of -55°C to 175°C and maintains Active product status. Equivalent and substitute parts are identified based on matching electrical characteristics including reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation ratings, as well as compatible package configurations for through-hole mounting.

Key Parameters

Parameter	5KP40CA-B
Manufacturer	Littelfuse Inc.
Type	Zener TVS Diode
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V
Current - Peak Pulse (10/1000µs)	79.1A
Power - Peak Pulse	5000W (5kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 5KP40CA-B are categorized based on electrical parameter compatibility and package type. The primary substitution criteria are:

Critical Electrical Parameters:

Voltage - Reverse Standoff (Typ): 40V ±5% tolerance range
Voltage - Clamping (Max) @ Ipp: 64.5V ±5% tolerance range
Power - Peak Pulse: 5000W (5kW) or compatible lower-power alternatives for reduced current applications
Current - Peak Pulse (10/1000µs): 79.1A or compatible ratings

Package Compatibility:

Primary: P600 axial package (direct mechanical and electrical equivalent)
Secondary: DO-201 axial package (compatible through-hole mounting with different form factor)
Tertiary: DO-15 axial package (compatible through-hole mounting for lower-power applications)

Substitutes are grouped into three categories: direct equivalents (P600 package, 5kW power rating), medium-power alternatives (DO-201 package, 1.5kW power rating), and lower-power alternatives (DO-15 package, 600W power rating).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	RoHS Status	Product Status
5KP40CA-B	Littelfuse Inc.	40V	64.5V	79.1A	5000W	P600, Axial	-55°C ~ 175°C	ROHS3 Compliant	Active
5KP40CA	Diotec Semiconductor	40V	64.5V	78A	5000W	P600, Axial	-50°C ~ 175°C	ROHS3 Compliant	Active
5KP40CA-TP	Micro Commercial Co	40V	64.5V	-	5000W	R-6, Axial	-55°C ~ 175°C	ROHS3 Compliant	Active
1.5KE47CA	Diotec Semiconductor	40.2V	64.8V	24A	1500W	DO-201AA, DO-27, Axial	-50°C ~ 175°C	Not applicable	Active
1.5KE51CA	Taiwan Semiconductor Corporation	43.6V	70.1V	22A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	ROHS3 Compliant	Active
1.5KE56CA	Taiwan Semiconductor Corporation	47.8V	77V	20A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	ROHS3 Compliant	Active
P6KE47CA	Diotec Semiconductor	40.2V	64.8V	9.7A	600W	DO-204AC, DO-15, Axial	-50°C ~ 175°C	ROHS3 Compliant	Active
P6KE51CA	Taiwan Semiconductor Corporation	43.6V	70.1V	8.6A	600W	DO-204AC, DO-15, Axial	-	ROHS3 Compliant	Active
P6KE56CA	Taiwan Semiconductor Corporation	47.8V	77V	7.8A	600W	DO-204AC, DO-15, Axial	-	ROHS3 Compliant	Active
SA48CA	Taiwan Semiconductor Corporation	48V	77.4V	6.7A	500W	DO-204AC, DO-15, Axial	-55°C ~ 175°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Equivalents (P600 Package, 5kW Rating): The 5KP40CA manufactured by Diotec Semiconductor provides direct electrical and mechanical equivalence to the 5KP40CA-B. Both maintain identical reverse standoff voltage (40V), clamping voltage (64.5V), and power dissipation (5000W). The Diotec variant operates across -50°C to 175°C, which is acceptable for most applications requiring the -55°C lower limit only in extreme cold environments. The 5KP40CA-TP from Micro Commercial Co offers identical electrical specifications with R-6 package configuration, maintaining full temperature range (-55°C to 175°C) and ROHS3 compliance.

Medium-Power Alternatives (DO-201 Package, 1.5kW Rating): The 1.5KE series TVS diodes (1.5KE47CA, 1.5KE51CA, 1.5KE56CA) provide reduced power dissipation (1500W) suitable for applications with lower transient energy requirements. These parts maintain through-hole axial mounting compatibility via DO-201 package. The 1.5KE47CA from Diotec Semiconductor matches the 40V reverse standoff voltage with 64.8V clamping voltage. The 1.5KE51CA and 1.5KE56CA from Taiwan Semiconductor Corporation offer higher voltage ratings (43.6V and 47.8V standoff respectively) with corresponding clamping voltages of 70.1V and 77V. All 1.5KE variants maintain ROHS3 compliance and Active product status.

Lower-Power Alternatives (DO-15 Package, 600W Rating): The P6KE series (P6KE47CA, P6KE51CA, P6KE56CA) and SA48CA provide 600W or 500W power dissipation in compact DO-15 package configuration. These are suitable for lower-current transient protection applications. The P6KE47CA matches the 40V standoff voltage with 64.8V clamping. The P6KE51CA and P6KE56CA offer 43.6V and 47.8V standoff voltages respectively. The SA48CA provides 48V standoff with 77.4V clamping and 500W power rating. All maintain ROHS3 compliance and Active status.

All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can I use a lower-power TVS diode (1.5kW or 600W) as a substitute for the 5KP40CA-B (5kW)?

A: Lower-power substitutes are applicable only when the application's transient energy is confirmed to be within the substitute's power rating. The 5KP40CA-B's 5kW rating accommodates higher transient energy pulses. Substitution with 1.5KE or P6KE series requires verification that peak pulse current and energy do not exceed the substitute's specifications.

Q: What is the difference between P600, DO-201, and DO-15 packages?

A: P600 is a larger axial package rated for 5kW power dissipation. DO-201 (DO-27) is a medium axial package rated for 1.5kW. DO-15 (DO-204AC) is a smaller axial package rated for 600W or 500W. All are through-hole mounting types with different physical dimensions and thermal dissipation capabilities. Package selection depends on available PCB space and power dissipation requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed maintain ROHS3 compliance or equivalent regulatory status. The 1.5KE47CA from Diotec Semiconductor shows "Not applicable" RoHS status; verify current compliance status with the manufacturer for applications requiring explicit ROHS3 certification.

Q: What is the significance of reverse standoff voltage tolerance?

A: Reverse standoff voltage determines the maximum voltage the TVS diode can withstand without conducting. The 5KP40CA-B specifies 40V typical. Substitutes with 40.2V (1.5KE47CA, P6KE47CA) or higher (43.6V, 47.8V, 48V) remain within acceptable tolerance for 40V protection circuits. Higher standoff voltages provide slightly increased protection margin but may not trigger as quickly in marginal overvoltage conditions.

Q: Can I substitute a 5KP40CA-B with a part having different clamping voltage?

A: Clamping voltage determines the maximum voltage across the protected circuit during transient suppression. The 5KP40CA-B clamps at 64.5V maximum. Substitutes with higher clamping voltages (70.1V, 77V, 77.4V) allow higher transient voltages to reach the protected circuit. Substitutes with identical or lower clamping voltages are preferred. Verify the protected circuit's voltage tolerance before selecting a substitute with different clamping characteristics.

Q: What operating temperature range should I consider for substitute selection?

A: The 5KP40CA-B operates from -55°C to 175°C. Most substitutes maintain this range or -50°C to 175°C. The -55°C lower limit is critical only for applications in extreme cold environments. Substitutes with -50°C minimum are acceptable for standard industrial and commercial applications. Verify application requirements before selecting parts with limited temperature ranges.

Q: Are there any mechanical compatibility issues when switching between package types?

A: Yes. P600, DO-201, and DO-15 packages have different physical dimensions and lead spacing. PCB footprints must match the selected package. P600 to DO-201 or DO-15 substitution requires PCB redesign or use of adapter components. Direct package-to-package substitution (P600 to P600, DO-201 to DO-201, DO-15 to DO-15) requires no PCB modification.

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