3KP26C Equivalent & Substitute Parts

Part Overview

The 3KP26C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional zener diode features a 26V reverse standoff voltage with a 44.21V maximum clamping voltage and 71.3A peak pulse current capability in a P600 axial package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	26V
Voltage - Breakdown (Min)	27.36V
Voltage - Clamping (Max) @ Ipp	44.21V
Current - Peak Pulse (10/1000µs)	71.3A
Power - Peak Pulse	3000W
Mounting Type	Through Hole
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
Type	Zener
Bidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the 3KP26C are grouped based on the following critical electrical and mechanical parameters that determine functional equivalence:

Primary Matching Criteria:

Voltage - Reverse Standoff: 26V (exact match required)
Voltage - Breakdown (Min): 27.36V to 28.9V (acceptable range)
Type: Zener, Bidirectional
Bidirectional Channels: 1
Applications: General Purpose
Mounting Type: Through Hole

Secondary Considerations:

Package / Case: P600 axial or DO-204AC (DO-15) axial
Operating Temperature Range: -55°C to 175°C minimum
RoHS3 Compliance

The substitute parts are divided into two categories based on power handling capability and package compatibility:

Category 1 - Higher Power Rating (P600 Package): 5KP26CA offers increased peak pulse power (5000W) while maintaining the same standoff voltage and package form factor.

Category 2 - Lower Power Rating (DO-204AC/DO-15 Package): SA26CA-B and SA26CA-TP provide reduced peak pulse power (500W) with a smaller axial package footprint, suitable for applications with lower transient energy requirements.

Parameter Comparison

Parameter	3KP26C (Main)	5KP26CA	SA26CA-B	SA26CA-TP
Manufacturer	Littelfuse Inc.	Diotec Semiconductor	Littelfuse	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	26V	26V	26V	26V
Voltage - Breakdown (Min)	27.36V	28.9V	28.9V	28.9V
Voltage - Clamping (Max) @ Ipp	44.21V	42.1V	42.1V	42.1V
Current - Peak Pulse (10/1000µs)	71.3A	119A	12.1A	12.1A
Power - Peak Pulse	3000W	5000W	500W	500W
Type	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1
Package / Case	P600, Axial	P600, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature	-55°C ~ 175°C	-50°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Power Class): The 5KP26CA is the primary substitute when PCB layout and package footprint must remain unchanged. It maintains the P600 axial package and exceeds the original 3000W power rating with 5000W capability. Both parts share identical standoff voltage specifications and are ROHS3 compliant. The 5KP26CA is currently in active production status with higher inventory availability.

For Space-Constrained or Lower-Power Applications: The SA26CA-B (Littelfuse) and SA26CA-TP (Micro Commercial Co) are suitable substitutes when reduced transient energy handling is acceptable. These parts use the smaller DO-204AC (DO-15) axial package with 500W peak pulse power rating. Both maintain the 26V standoff voltage and -55°C to 175°C operating temperature range. SA26CA-B carries ROHS3 compliance and REACH Unaffected status. SA26CA-TP status for REACH compliance is not specified in available documentation.

Compliance Considerations: All substitute parts maintain ROHS3 compliance. The 5KP26CA requires REACH information upon request. SA26CA-B is REACH Unaffected. Selection should account for specific regulatory requirements in the target application region.

Frequently Asked Questions (FAQ)

Q: Can the 5KP26CA directly replace the 3KP26C without circuit modification? A: Yes, the 5KP26CA is a direct replacement for the 3KP26C. Both use the P600 axial package, maintain 26V standoff voltage, and are rated for general-purpose transient suppression. The 5KP26CA's higher 5000W power rating provides additional margin over the original 3000W specification.

Q: What is the key difference between the 5KP26CA and SA26CA-B substitutes? A: The primary differences are package size and power rating. The 5KP26CA uses the P600 package with 5000W peak pulse power and 119A peak current. The SA26CA-B uses the smaller DO-204AC (DO-15) package with 500W peak pulse power and 12.1A peak current. Package selection depends on PCB layout constraints and transient energy requirements.

Q: Are SA26CA-B and SA26CA-TP interchangeable? A: Both parts share identical electrical specifications (26V standoff, 42.1V clamping, 12.1A peak current, 500W power rating) and use the DO-15 package. The primary difference is manufacturer: SA26CA-B is from Littelfuse with confirmed ROHS3 compliance and REACH Unaffected status, while SA26CA-TP is from Micro Commercial Co with REACH status not specified.

Q: What is the operating temperature range compatibility? A: The 3KP26C, SA26CA-B, and SA26CA-TP all operate from -55°C to 175°C. The 5KP26CA operates from -50°C to 175°C, which is acceptable for most applications but has a 5°C higher minimum temperature limit.

Q: Can I use a substitute part with lower peak pulse power in my application? A: Substitution with lower power-rated parts (SA26CA-B or SA26CA-TP at 500W) is only valid if your circuit's transient energy does not exceed the substitute's rating. The original 3KP26C is rated for 3000W; using a 500W part requires confirmation that actual transient events remain below this threshold.

Q: Are all substitute parts currently available? A: Yes. The 5KP26CA has 4100 units in stock, SA26CA-B has 886 units, and SA26CA-TP has 1078 units available as new original inventory.

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