5KP40C-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP40C-B is a bidirectional Zener TVS diode manufactured by Littelfuse Inc., designed for transient voltage suppression in general-purpose applications. Featuring a 40V reverse standoff voltage and 5000W peak pulse power rating in a P600 axial through-hole package, this component provides protection against voltage transients in electronic circuits.

The 5KP40C-B is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with active product status, offering comparable electrical performance and mechanical compatibility for circuit protection applications.

Key Parameters

Parameter	5KP40C-B
Manufacturer	Littelfuse Inc.
Type	Zener TVS Diode
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	42.08V
Voltage - Clamping (Max) @ Ipp	67.73V
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 5KP40C-B is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 40V ±5%
Voltage - Clamping (Max) @ Ipp: 64.5V to 67.73V range
Power - Peak Pulse: 5000W (5kW)
Bidirectional Channels: 1
Mounting Type: Through Hole
Package / Case: P600, Axial

Secondary Compatibility Factors:

Operating Temperature Range: -55°C minimum to 175°C maximum
RoHS3 Compliance
Type: Zener TVS Diode

Substitute parts are grouped into two categories based on package compatibility:

Category 1 - P600 Axial Package (Direct Mechanical Replacement): Parts maintaining identical P600 axial form factor with 5000W power rating enable direct board-level substitution without layout modifications.

Category 2 - Reduced Power Rating Alternatives (DO-201 and DO-15 Packages): Parts with lower power ratings (1500W or 600W) in alternative packages (DO-201, DO-15) provide electrical protection at reduced transient energy levels and require circuit board redesign for mechanical accommodation.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status	RoHS Status
5KP40C-B	Littelfuse Inc.	40V	42.08V	67.73V	5000W	P600, Axial	-55°C ~ 175°C	Obsolete	ROHS3 Compliant
5KP40CA	Diotec Semiconductor	40V	44.4V	64.5V	5000W	P600, Axial	-50°C ~ 175°C	Active	ROHS3 Compliant
5KP40CA-B	Littelfuse Inc.	40V	44.4V	64.5V	5000W	P600, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
SLD40-018-B	Littelfuse Inc.	40V	44.4V	64.5V	5000W	P600, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5KE47CA	Diotec Semiconductor	40.2V	44.7V	64.8V	1500W	DO-201AA, Axial	-50°C ~ 175°C	Active	Not applicable
1.5KE51CA	Taiwan Semiconductor Corporation	43.6V	48.5V	70.1V	1500W	DO-201AA, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5KE56CA	Taiwan Semiconductor Corporation	47.8V	53.2V	77V	1500W	DO-201AA, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
P6KE47CA	Diotec Semiconductor	40.2V	44.7V	64.8V	600W	DO-204AC, Axial	-50°C ~ 175°C	Active	ROHS3 Compliant
P6KE51CA	Taiwan Semiconductor Corporation	43.6V	48.5V	70.1V	600W	DO-204AC, Axial	Not specified	Active	ROHS3 Compliant
SA48CA	Taiwan Semiconductor Corporation	48V	53.3V	77.4V	500W	DO-204AC, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1N6124	Semtech Corporation	42.6V	50.4V	80.7V	500W	Axial	-65°C ~ 175°C	Discontinued	Not specified

Engineering Selection Recommendations

Direct Replacement (P600 Package, 5000W Rating):

The 5KP40CA-B (Littelfuse Inc.) and SLD40-018-B (Littelfuse Inc.) are the primary direct replacements for the 5KP40C-B. Both maintain identical package geometry, power rating, and operating temperature range (-55°C to 175°C). The 5KP40CA-B is available in active production status with ROHS3 compliance and equivalent electrical performance. The SLD40-018-B offers automotive-grade qualification (AEC-Q101) for applications requiring enhanced reliability specifications.

The 5KP40CA (Diotec Semiconductor) provides equivalent electrical performance in the P600 package with 5000W power rating and ROHS3 compliance. Operating temperature range is -50°C to 175°C, which is acceptable for most general-purpose applications but does not extend to the -55°C minimum of the original part.

Alternative Substitutes (Reduced Power Rating):

The 1.5KE47CA and 1.5KE51CA (1500W rating, DO-201 package) and P6KE47CA and P6KE51CA (600W rating, DO-15 package) are suitable only for applications where transient energy levels are lower than the original 5000W specification. These parts require circuit board layout modifications due to different package form factors. Selection among these alternatives depends on the specific transient energy profile of the application.

The 1.5KE56CA (Taiwan Semiconductor Corporation) includes automotive-grade qualification (AEC-Q101) and operates across the full -55°C to 175°C temperature range with ROHS3 compliance.

Discontinued Parts:

The 1N6124 (Semtech Corporation) is discontinued at DiGi Electronics and should not be selected for new designs or long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can the 5KP40CA-B directly replace the 5KP40C-B without board modifications?

A: Yes. The 5KP40CA-B maintains identical P600 axial package geometry, 5000W power rating, and -55°C to 175°C operating temperature range. No circuit board layout changes are required for mechanical or electrical accommodation.

Q: What is the difference between the 5KP40CA and 5KP40CA-B?

A: The 5KP40CA is supplied in Tape & Reel (TR) packaging by Diotec Semiconductor with a -50°C to 175°C operating temperature range. The 5KP40CA-B is supplied in Bulk packaging by Littelfuse Inc. with a -55°C to 175°C operating temperature range. Electrical performance is equivalent. Selection depends on packaging requirements and minimum operating temperature specifications.

Q: Why do the 1.5KE and P6KE series parts have lower power ratings?

A: The 1.5KE series (1500W) and P6KE series (600W) are designed for lower transient energy applications. These parts use different package geometries (DO-201 and DO-15 respectively) that dissipate less peak pulse power than the P600 package. Selection of these alternatives requires verification that the application's transient energy profile does not exceed the specified power rating.

Q: Is the SLD40-018-B suitable for automotive applications?

A: Yes. The SLD40-018-B carries AEC-Q101 automotive qualification and is rated for -55°C to 175°C operation with ROHS3 compliance. It is suitable for automotive and industrial applications requiring enhanced reliability specifications.

Q: What is the impact of voltage clamping differences between substitute parts?

A: Voltage clamping values (64.5V to 80.7V across the substitute list) determine the maximum voltage transient suppression level. The 5KP40C-B specifies 67.73V clamping. Substitute parts with clamping values within ±5% (64.2V to 71.1V) provide equivalent transient suppression. Parts with higher clamping values (such as 1.5KE56CA at 77V or 1N6124 at 80.7V) allow higher voltage transients to pass through and should be selected only if the application circuit can tolerate these higher voltage levels.

Q: Can I use a lower power-rated part (1500W or 600W) in place of the 5000W 5KP40C-B?

A: Only if the application's transient energy profile is confirmed to be below the substitute part's power rating. The 5000W rating of the original part indicates the circuit experiences transient pulses up to 5000W. Using a lower-rated part in a 5000W environment will result in component failure. Substitution with reduced power ratings requires detailed analysis of the actual transient energy in the application.

Q: Are all substitute parts RoHS3 compliant?

A: Most substitute parts listed are ROHS3 compliant. The 1.5KE47CA (Diotec Semiconductor) and 1N6124 (Semtech Corporation) do not specify RoHS3 compliance status. For applications requiring RoHS3 certification, select from parts explicitly marked as ROHS3 Compliant.

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