Equivalent & Substitute Parts for 5KP14-B TVS Diode

Part Overview

The 5KP14-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 14V reverse standoff voltage, 24.36V maximum clamping voltage, and 5000W peak pulse power rating in a through-hole P600 axial package. The 5KP14-B is currently listed as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	14	V
Voltage - Breakdown (Min)	14.76	V
Voltage - Clamping (Max) @ Ipp	24.36	V
Power - Peak Pulse	5000	W
Type	Zener	—
Unidirectional Channels	1	—
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Operating Temperature Range	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 5KP14-B is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Reverse standoff voltage: 14V (all substitutes maintain this specification)
Breakdown voltage minimum: 14.76V to 15.6V range (acceptable variance for TVS diodes)
Peak pulse power rating: 5000W (all substitutes maintain this specification)
Zener type, unidirectional configuration: required for functional equivalence
Through-hole mounting: required for board-level compatibility
Operating temperature range: -55°C to 175°C (primary range; -55°C to 150°C acceptable for limited applications)
RoHS3 compliance: required for regulatory alignment

Package Considerations: Substitutes are grouped by package type: P600 axial (direct mechanical equivalent) and R-6 axial (alternative through-hole package with similar form factor). Both packages are through-hole configurations suitable for the same PCB footprints with minor mechanical adjustments.

Clamping Voltage Variance: The 5KP14-B specifies 24.36V maximum clamping voltage. Substitute parts range from 23.2V to 25.8V clamping voltage. This variance is within acceptable TVS diode design tolerances and does not preclude substitution for general-purpose overvoltage protection applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package / Case	Operating Temp (°C)	Product Status
5KP14-B	Littelfuse Inc.	14	14.76	24.36	—	5000	P600, Axial	-55 to 175	Obsolete
5KP14A-B	Littelfuse Inc.	14	15.6	23.2	219.8	5000	P600, Axial	-55 to 175	Active
5KP14A	Littelfuse Inc.	14	15.6	23.2	219.8	5000	P600, Axial	-55 to 175	Active
SLD14U-017-B	Littelfuse Inc.	14	15.6	23.2	219.8	5000	P600, Axial	-55 to 175	Active
5KP14A-G	Comchip Technology	14	15.6	23.2	215.52	5000	R-6, Axial	-55 to 150	Active
5KP14A-TP	Micro Commercial Co	14	15.6	23.2	215	5000	R-6, Axial	-55 to 175	Active
5KP14AE3/TR13	Microchip Technology	14	15.6	23.2	216	5000	P600, Axial	-55 to 175	Active
5KP14E3/TR13	Microchip Technology	14	15.6	25.8	194	5000	P600, Axial	-55 to 175	Active

Engineering Selection Recommendations

Primary Substitutes (Littelfuse Inc., P600 Package): The 5KP14A, 5KP14A-B, and 5KP14AE3/TR13 are direct electrical and mechanical equivalents manufactured by Littelfuse Inc. in the P600 axial package. All three maintain the 14V reverse standoff voltage, 5000W peak pulse power rating, and -55°C to 175°C operating temperature range. These parts are active products with ROHS3 compliance and are recommended as primary replacements for the obsolete 5KP14-B.

Automotive-Grade Alternative (Littelfuse Inc., P600 Package): The SLD14U-017-B is an automotive-qualified TVS diode (AEC-Q101) in the P600 axial package with identical electrical specifications to the 5KP14A series. This part is suitable for applications requiring automotive-grade component qualification and traceability.

Alternative Package Options (R-6 Axial): The 5KP14A-G (Comchip Technology) and 5KP14A-TP (Micro Commercial Co) provide equivalent electrical performance in the R-6 through-hole axial package. The R-6 package is mechanically compatible with standard through-hole PCB footprints designed for axial components. The 5KP14A-G operates to 150°C maximum junction temperature; the 5KP14A-TP operates to 175°C. Selection between these alternatives depends on thermal environment requirements and PCB layout constraints.

Higher Clamping Voltage Option: The 5KP14E3/TR13 (Microchip Technology) provides a 25.8V maximum clamping voltage compared to the 5KP14-B specification of 24.36V. This part is suitable for applications where slightly elevated clamping voltage is acceptable and provides additional design margin for transient suppression.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 5KP14-B with any of the listed alternatives without PCB modification?

A: Yes, for P600 axial package substitutes (5KP14A, 5KP14A-B, 5KP14AE3/TR13, SLD14U-017-B). These parts are mechanically and electrically equivalent and require no PCB footprint changes. R-6 package alternatives (5KP14A-G, 5KP14A-TP) are also through-hole axial components but may require minor PCB layout verification due to package dimensional differences.

Q: What is the significance of the clamping voltage difference between 5KP14-B (24.36V) and 5KP14A (23.2V)?

A: Both values fall within the acceptable operating range for 14V standoff TVS diodes. The 5KP14A provides lower clamping voltage, which offers more aggressive transient suppression. The 5KP14E3/TR13 provides higher clamping voltage (25.8V) for applications requiring less aggressive clamping. Selection depends on specific circuit protection requirements.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes, all active substitute parts listed are ROHS3 compliant. The 5KP14-B was also ROHS3 compliant, ensuring regulatory continuity in replacement.

Q: What is the difference between the 5KP14A and 5KP14AE3/TR13?

A: Both parts are electrically identical with 14V standoff voltage, 23.2V clamping voltage, and 5000W peak pulse power. The primary difference is packaging: 5KP14A is supplied in cut tape (CT), while 5KP14AE3/TR13 is supplied in tape and reel (TR). Selection depends on procurement and assembly requirements.

Q: Can I use the SLD14U-017-B in non-automotive applications?

A: Yes. The SLD14U-017-B is an automotive-qualified part (AEC-Q101) but is electrically and mechanically suitable for general-purpose applications. Automotive qualification indicates enhanced quality and traceability standards, making it acceptable for any application requiring the 14V/5000W TVS specification.

Q: What is the operating temperature limitation of the 5KP14A-G compared to other substitutes?

A: The 5KP14A-G operates to 150°C maximum junction temperature, compared to 175°C for most other substitutes. This 25°C difference may be significant in high-temperature environments. For applications operating above 150°C, select alternatives with 175°C ratings (5KP14A, 5KP14A-B, 5KP14AE3/TR13, 5KP14E3/TR13, 5KP14A-TP).

Q: Are there any compliance or certification differences between manufacturers?

A: All listed substitutes maintain ROHS3 compliance. The SLD14U-017-B additionally carries AEC-Q101 automotive qualification. All parts are REACH unaffected or compliant. No other significant compliance differences exist among the listed alternatives.

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