5KP40C Equivalent & Substitute Parts

Part Overview

The 5KP40C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 40V reverse standoff voltage with 5000W peak pulse power handling. This P600 axial package component is designed for general-purpose transient voltage protection applications. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	42.08V
Voltage - Clamping (Max) @ Ipp	67.73V
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 5KP40C is determined by the following critical parameters:

Primary Matching Criteria:

Reverse standoff voltage: 40V nominal
Power rating: 5000W peak pulse capability
Package type: P600 axial through-hole
Bidirectional operation: Single channel
Type: Zener TVS diode

Secondary Compatibility Factors:

Voltage clamping characteristics within acceptable range
Operating temperature range coverage
RoHS3 compliance
Product status (active preferred for obsolete parts)

Substitute parts are grouped into two categories: direct P600 package replacements and alternative package options with comparable electrical performance.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse Power	Package	Status
5KP40C	Littelfuse Inc.	40	42.08	67.73	5000W	P600	Obsolete
5KP40CA	Diotec Semiconductor	40	44.4	64.5	5000W	P600	Active
5KP40CE3/TR13	Microchip Technology	40	44.4	71.4	5000W	P600	Active
SLD40-018-B	Littelfuse Inc.	40	44.4	64.5	5000W	P600	Active
1.5KE51CA	Taiwan Semiconductor Corporation	43.6	48.5	70.1	1500W	DO-201	Active
1.5KE56CA	Taiwan Semiconductor Corporation	47.8	53.2	77	1500W	DO-201	Active
P6KE47CA	Diotec Semiconductor	40.2	44.7	64.8	600W	DO-15	Active
P6KE51CA	Taiwan Semiconductor Corporation	43.6	48.5	70.1	600W	DO-15	Active
SA48CA	Taiwan Semiconductor Corporation	48	53.3	77.4	500W	DO-15	Active
P4KE56CA-TP	Micro Commercial Co	47.8	53.2	77	400W	DO-41	Active
1N6124	Semtech Corporation	42.6	50.4	80.7	500W	Axial	Discontinued

Engineering Selection Recommendations

Direct Replacements (P600 Package, 5000W Rating):

The 5KP40CA (Diotec Semiconductor), 5KP40CE3/TR13 (Microchip Technology), and SLD40-018-B (Littelfuse Inc.) are direct functional equivalents. All maintain 40V reverse standoff voltage, 5000W peak pulse power, and P600 axial packaging. These parts are active products with ROHS3 compliance. The SLD40-018-B carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Alternative Package Options:

For applications where package constraints permit, the 1.5KE51CA and 1.5KE56CA (Taiwan Semiconductor Corporation, DO-201 package) provide active alternatives with comparable voltage characteristics. These parts operate at reduced power ratings (1500W) and require circuit redesign consideration. Both maintain -55°C to 175°C operating temperature range and ROHS3 compliance.

The P6KE47CA and P6KE51CA (DO-15 package) offer further size reduction with 600W power ratings. The SA48CA (Taiwan Semiconductor Corporation, DO-15 package) provides the smallest footprint at 500W rating.

Avoid:

The 1N6124 (Semtech Corporation) is discontinued at DiGi Electronics and should not be selected for new designs despite electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP40CA as a direct replacement for 5KP40C?

A: Yes. The 5KP40CA maintains identical reverse standoff voltage (40V), peak pulse power (5000W), and P600 axial package. Electrical parameters fall within acceptable substitution range. The part is active and ROHS3 compliant.

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

A: P600 and DO-201 are both through-hole axial packages but differ in physical dimensions and lead spacing. They are not mechanically interchangeable on the same PCB. DO-201 parts require board redesign if substituting for P600 originals.

Q: Why do some substitutes have lower power ratings?

A: Parts like the 1.5KE series (1500W) and P6KE series (600W) represent different product lines with reduced power handling. Selection depends on actual circuit transient energy requirements. Lower-rated parts may be insufficient for high-energy transient events.

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

A: Yes. The SLD40-018-B carries AEC-Q101 qualification and automotive-grade designation, making it appropriate for automotive transient protection circuits.

Q: Can I substitute a 43.6V part for a 40V application?

A: Substitution depends on circuit margin requirements. Parts like 1.5KE51CA (43.6V standoff) operate at higher voltage thresholds. This may be acceptable if the application tolerates delayed clamping, but requires circuit analysis to confirm adequate protection margins.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended substitutes maintain this compliance.

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