Equivalent & Substitute Parts for 5KP30-B TVS Diode

Part Overview

The 5KP30-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This part features a 30V reverse standoff voltage rating and 5000W peak pulse power handling capability in a through-hole P600 axial package. The 5KP30-B is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP30-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	30V
Voltage - Breakdown (Min)	31.55V
Voltage - Clamping (Max) @ Ipp	50.82V
Power - Peak Pulse	5000W (5kW)
Operating Temperature Range	-55°C to 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 5KP30-B is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage of 30V (±tolerance per manufacturer specification)
Package Type: Through-hole axial configuration (P600 or equivalent mechanical form factor)
Power Rating: 5000W peak pulse power handling
Unidirectional Operation: Single-channel Zener TVS diode
Temperature Range: Operating range of -55°C to 175°C or better
Compliance: ROHS3 compliance required

Substitute parts are grouped into two categories based on package compatibility:

Category A - P600 Package (Direct Mechanical Substitutes): Parts maintaining the identical P600 axial package form factor, enabling direct board-level replacement without layout modification.

Category B - Alternative Packages (Functional Equivalents): Parts with different mechanical packages (DO-204AC, R-6) that provide electrical equivalence but require package-specific mounting considerations.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status	RoHS Status
5KP30-B	Littelfuse Inc.	30V	31.55V	50.82V	5000W	P600, Axial	-55°C to 175°C	Obsolete	ROHS3 Compliant
5KP30A	Diotec Semiconductor	30V	33.3V	48.4V	5000W	P600, Axial	-50°C to 175°C	Active	ROHS3 Compliant
5KP30A-B	Littelfuse Inc.	30V	33.3V	48.4V	5000W	P600, Axial	-55°C to 175°C	Active	ROHS3 Compliant
5KP30E3/TR13	Microchip Technology	30V	33.3V	54.6V	5000W	P600, Axial	-55°C to 175°C	Active	ROHS3 Compliant
SLD30U-017-B	Littelfuse Inc.	30V	33.3V	48.4V	5000W	P600, Axial	-55°C to 175°C	Active	ROHS3 Compliant
5KP30A-TP	Micro Commercial Co	30V	33.3V	48.4V	5000W	R-6, Axial	-55°C to 175°C	Active	ROHS3 Compliant
30KP30A-TP	Micro Commercial Co	30V	34.61V	55.2V	30000W	R-6, Axial	-55°C to 175°C	Active	ROHS3 Compliant
SA30A	Taiwan Semiconductor Corporation	30V	33.3V	64.3V	500W	DO-204AC (DO-15), Axial	-55°C to 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (P600 Package - Direct Replacement)

The following parts provide direct mechanical and electrical substitution for the 5KP30-B:

5KP30A-B (Littelfuse Inc.): Active product status with identical temperature range (-55°C to 175°C) and P600 package. Maintains Littelfuse manufacturing continuity. Clamping voltage of 48.4V is within acceptable tolerance band relative to the original 50.82V specification.
5KP30E3/TR13 (Microchip Technology): Active product with P600 package and full temperature range support. Clamping voltage of 54.6V provides closer alignment to the original 50.82V specification. Suitable for applications requiring tighter voltage control.
SLD30U-017-B (Littelfuse Inc.): Active automotive-grade part with AEC-Q101 qualification. Maintains P600 package compatibility and full temperature range. Recommended for automotive or mission-critical applications requiring enhanced reliability documentation.

Secondary Substitutes (Alternative Packages)

5KP30A-TP (Micro Commercial Co): Active product with R-6 package. Electrical parameters match 5KP30A-B. Requires board layout modification due to different mechanical form factor.
30KP30A-TP (Micro Commercial Co): Active product with significantly higher power rating (30kW vs. 5kW). R-6 package requires layout modification. Select only if application requires enhanced transient energy absorption beyond 5kW specification.

Not Recommended for Direct Substitution

SA30A (Taiwan Semiconductor Corporation): While electrically compatible at the 30V standoff level, the DO-204AC package differs mechanically from P600, and the 500W power rating is substantially lower than the 5kW requirement. Suitable only for lower-power applications.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP30A-B as a direct replacement for 5KP30-B?

A: Yes. The 5KP30A-B maintains identical package (P600), power rating (5000W), temperature range (-55°C to 175°C), and voltage standoff (30V). The clamping voltage difference (48.4V vs. 50.82V) falls within normal manufacturing tolerance for this device category and does not affect functional compatibility in general-purpose overvoltage protection circuits.

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 differ in physical dimensions and lead spacing. Direct board-level substitution between these packages requires PCB layout modification. Verify footprint compatibility before selecting R-6 alternatives.

Q: Why is SA30A listed as a substitute if the power rating is only 500W?

A: SA30A is electrically equivalent at the 30V voltage rating but is functionally suitable only for lower-power transient suppression applications. It is not recommended as a substitute for the 5KP30-B in circuits requiring 5000W peak pulse handling. Use SA30A only if your application's actual transient energy requirement is below 500W.

Q: Is the SLD30U-017-B automotive-qualified version suitable for non-automotive applications?

A: Yes. Automotive-grade parts (AEC-Q101 qualified) meet or exceed general industrial reliability standards. The SLD30U-017-B can be used in any application where the 5KP30-B was specified, with the added benefit of enhanced qualification documentation.

Q: What does "clamping voltage" mean, and why does it vary between substitutes?

A: Clamping voltage is the maximum voltage across the TVS diode during transient suppression at peak pulse current. Variation between parts (48.4V to 55.2V in this group) reflects different internal junction designs and manufacturing processes. All listed substitutes maintain the 30V standoff specification and provide adequate overvoltage protection within their respective clamping ranges.

Q: Can I use 30KP30A-TP instead of 5KP30A-TP for higher transient protection?

A: The 30KP30A-TP has a 30kW power rating versus 5kW for standard 5KP series parts. Use this part only if your circuit analysis confirms transient energy exceeds 5kW. Oversizing the power rating unnecessarily increases component cost and may affect circuit response characteristics.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the environmental compliance requirement of the original 5KP30-B.

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