5KP26 Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The 5KP26 is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 26V reverse standoff voltage rating with 5000W peak pulse power handling capability in a through-hole P600 axial package. The 5KP26 is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, power dissipation, and thermal operating ranges while accommodating packaging variations.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	26	V
Voltage - Breakdown (Min)	27.36	V
Voltage - Clamping (Max) @ Ipp	44.21	V
Power - Peak Pulse	5000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP26 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 26V
Voltage - Breakdown (Min): 28.9V or higher
Voltage - Clamping (Max) @ Ipp: 42.1V to 46.6V range
Power - Peak Pulse: 5000W
Operating Temperature Range: -55°C to 175°C (TJ)
Type: Zener, Unidirectional
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories: direct electrical equivalents with identical P600 packaging, and functionally equivalent parts with alternative axial packages (R-6). All substitutes maintain the 26V standoff voltage, 5000W power rating, and full operating temperature range. Clamping voltage variations (42.1V to 46.6V) remain within acceptable protection thresholds for general-purpose applications. Packaging differences do not affect electrical performance but may require mechanical board layout adjustments.

Parameter Comparison

Parameter	5KP26	5KP26A	SLD26U-017-B	5KP26A-TP	5KP26E3/TR13
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	26V	26V	26V	26V	26V
Voltage - Breakdown (Min)	27.36V	28.9V	28.9V	28.9V	28.9V
Voltage - Clamping (Max) @ Ipp	44.21V	42.1V	42.1V	42.1V	46.6V
Current - Peak Pulse (10/1000µs)	—	121.1A	121.1A	—	107A
Power - Peak Pulse	5000W	5000W	5000W	5000W	5000W
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	P600, Axial	P600, Axial	P600, Axial	R-6, Axial	P600, Axial
Packaging Type	Tape & Reel (TR)	Cut Tape (CT)	Bulk	Cut Tape (CT)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

5KP26A (Littelfuse Inc.) — Active status direct equivalent with P600 packaging. Identical mechanical fit and electrical performance. Available in Cut Tape packaging for component-level procurement. Recommended as primary substitute for direct board replacement.

SLD26U-017-B (Littelfuse Inc.) — Active status equivalent with automotive-grade qualification (AEC-Q101) and REACH compliance documentation. P600 packaging maintains mechanical compatibility. Bulk packaging suitable for high-volume manufacturing. Recommended for applications requiring automotive-grade certification.

5KP26A-TP (Micro Commercial Co) — Active status equivalent with R-6 axial package. Electrical parameters match 5KP26A. Package footprint differs from original P600; board layout modification required. Recommended when R-6 package availability or cost considerations justify mechanical redesign.

5KP26E3/TR13 (Microchip Technology) — Active status equivalent with P600 packaging and Tape & Reel format. Clamping voltage 46.6V represents upper tolerance range; acceptable for general-purpose protection. Recommended for high-volume automated assembly requiring reel packaging.

Frequently Asked Questions (FAQ)

Q: Can 5KP26A directly replace 5KP26 without board modifications? A: Yes. 5KP26A maintains identical P600 axial package geometry, voltage ratings, power dissipation, and operating temperature range. No board layout changes required.

Q: What is the significance of clamping voltage variation between substitutes? A: Clamping voltage (42.1V to 46.6V) determines transient peak voltage at the protected circuit. All substitutes remain within acceptable protection thresholds for 26V standoff applications. Selection depends on specific circuit overvoltage tolerance specifications.

Q: Is SLD26U-017-B suitable for non-automotive applications? A: Yes. AEC-Q101 automotive qualification indicates enhanced reliability screening. This part is functionally equivalent for general-purpose applications and offers additional quality assurance documentation.

Q: Does packaging type (Tape & Reel vs. Cut Tape vs. Bulk) affect electrical performance? A: No. Packaging type affects procurement, handling, and assembly processes only. Electrical characteristics remain identical across all packaging formats for the same part number.

Q: Can 5KP26A-TP be used as a direct substitute despite R-6 package differences? A: Electrical substitution is valid. Mechanical substitution requires board redesign to accommodate R-6 package footprint. Evaluate cost-benefit of layout modification against component availability.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitutes maintain ROHS3 Compliant status, meeting environmental and hazardous substance restrictions.

Q: What is the inventory status for each substitute? A: 5KP26A: 4605 pcs; SLD26U-017-B: 684 pcs; 5KP26A-TP: 1143 pcs; 5KP26E3/TR13: 704 pcs. Availability subject to current stock levels.

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