Equivalent & Substitute Parts for 3KP26C-B TVS Diode

Part Overview

The 3KP26C-B is a Littelfuse transient voltage suppressor (TVS) diode in the 3KP series, designed for general-purpose overvoltage protection applications. This through-hole axial component features a 26V reverse standoff voltage and 3000W peak pulse power rating. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and component procurement.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the 3KP26C-B is determined by the following critical parameters:

Reverse Standoff Voltage: Must be 26V (all substitutes maintain this specification)
Breakdown Voltage Range: 27.36V to 28.9V (acceptable tolerance band)
Clamping Voltage: 42.1V to 44.21V (acceptable range for circuit protection)
Peak Pulse Current: 71.3A minimum (3KP26CA-TP matches exactly; higher ratings acceptable)
Peak Pulse Power: 3000W minimum (5KP series provides 5000W; 15KP series provides 15000W)
Operating Temperature: -55°C to 175°C (all substitutes support this range)
Mounting Type: Through-hole axial configuration
Bidirectional Channels: Single channel (all substitutes are single-channel)

Substitutes are grouped by package type (P600/R-6 axial vs. DO-204AC/DO-15 axial) and power rating capability. Higher power-rated devices (5KP and 15KP series) provide enhanced transient suppression capacity while maintaining voltage specifications.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamp Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Status
3KP26C-B	Littelfuse	26	27.36	44.21	71.3	3000	P600	Obsolete
5KP26CA-B	Littelfuse Inc.	26	28.9	42.1	121.1	5000	P600	Active
3KP26CA-TP	Micro Commercial Co	26	28.9	42.1	71.3	3000	R-6	Active
5KP26CA-TP	Micro Commercial Co	26	28.9	42.1	—	5000	R-6	Active
5KP26CA-G	Comchip Technology	26	28.9	42.1	118.76	5000	R-6	Active
15KP26CA-TP	Micro Commercial Co	26	28.9	44	347	15000	R-6	Active
SA26CA-B	Littelfuse	26	28.9	42.1	12.1	500	DO-204AC	Active
SA26CA-TP	Micro Commercial Co	26	28.9	42.1	12.1	500	DO-15	Active
SA26CA	Taiwan Semiconductor Corporation	26	28.9	54.6	12.4	500	DO-204AC	Active

Engineering Selection Recommendations

Direct Package Replacement (P600 Axial)

5KP26CA-B (Littelfuse) is the primary substitute for P600 package compatibility. It maintains the same manufacturer lineage, package form factor, and operating temperature range (-55°C to 175°C). The 5KP26CA-B provides enhanced peak pulse current (121.1A vs. 71.3A) and power rating (5000W vs. 3000W), offering improved transient suppression margin. Both parts are ROHS3 compliant with MSL 1 rating.

Alternative Package Options (R-6 Axial)

3KP26CA-TP (Micro Commercial Co) provides identical electrical performance to the original 3KP26C-B (71.3A peak pulse current, 3000W power rating) in an R-6 package. This option is suitable when P600 package availability is constrained. 5KP26CA-TP and 5KP26CA-G offer higher power ratings (5000W) in R-6 packages for applications requiring enhanced transient suppression.

Higher Power Rating Option

15KP26CA-TP (Micro Commercial Co) in R-6 package provides 15000W peak pulse power with 347A peak pulse current. This part is appropriate for high-energy transient environments where the original 3000W rating is insufficient.

Lower Power Alternative (DO-15 Package)

SA26CA-B and SA26CA-TP are lower-power alternatives (500W, 12.1A) in DO-204AC/DO-15 packages. These parts are suitable only for applications with reduced transient energy requirements and are not recommended as direct replacements for the 3KP26C-B in high-current protection circuits.

All substitute parts maintain the 26V reverse standoff voltage, -55°C to 175°C operating temperature range, and ROHS3 compliance required for equivalent functionality.

Frequently Asked Questions (FAQ)

Q: Can 5KP26CA-B replace 3KP26C-B in my circuit?

A: Yes. Both parts share identical reverse standoff voltage (26V), breakdown voltage range (27.36V–28.9V), and operating temperature specifications (-55°C to 175°C). The 5KP26CA-B provides higher peak pulse current (121.1A vs. 71.3A) and power rating (5000W vs. 3000W), making it a direct upgrade. The P600 package form factor is identical, enabling direct board-level substitution.

Q: What is the difference between P600 and R-6 packages?

A: Both are through-hole axial packages for TVS diodes. P600 and R-6 are equivalent form factors with identical lead spacing and mounting characteristics. The primary difference is manufacturer designation. Parts in either package can be used interchangeably on PCBs designed for axial through-hole components.

Q: Why do some substitutes have higher peak pulse current ratings?

A: The 5KP and 15KP series are designed for higher transient energy suppression. A 5KP26CA-B rated for 121.1A peak pulse current can handle larger transient events than the 3KP26C-B (71.3A). Using a higher-rated part provides additional protection margin without affecting normal circuit operation, as the clamping voltage remains within the same specification band (42.1V–44.21V).

Q: Are SA26CA parts suitable replacements?

A: SA26CA parts (500W, 12.1A) are not recommended as direct replacements for the 3KP26C-B in circuits designed for 3000W transient suppression. These lower-power devices are suitable only for applications with significantly reduced transient energy requirements. The DO-204AC/DO-15 package is also physically different from the P600 package.

Q: Do all substitutes meet RoHS and REACH compliance?

A: All listed substitutes are ROHS3 compliant. REACH status varies by manufacturer: Littelfuse, Micro Commercial Co, and Comchip Technology parts are REACH Unaffected. Taiwan Semiconductor Corporation parts are also REACH Unaffected. Verify specific compliance documentation with your supplier for regulatory requirements.

Q: What is the operating temperature range for substitutes?

A: All primary substitutes (5KP26CA-B, 3KP26CA-TP, 5KP26CA-TP, SA26CA-B, SA26CA-TP) operate from -55°C to 175°C, matching the original 3KP26C-B specification. The 5KP26CA-G (Comchip) operates from -55°C to 150°C, which is acceptable for most applications but has a narrower upper temperature limit.

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