Equivalent & Substitute Parts for 3KP30A-B TVS Diode

Part Overview

The 3KP30A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 30V reverse standoff voltage with a 48.4V maximum clamping voltage and 62A peak pulse current capability in a through-hole 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	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	48.4	V
Current - Peak Pulse (10/1000µs)	62	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the 3KP30A-B is determined by the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 30V and breakdown voltage minimum of 33.3V must be maintained
Clamping Voltage Compatibility: Maximum clamping voltage at peak pulse current must not exceed 48.4V to ensure circuit protection integrity
Package Compatibility: Through-hole axial mounting with P600 or equivalent package footprint
Thermal Performance: Operating temperature range of -55°C to 175°C
Diode Type: Unidirectional Zener TVS configuration

Substitute parts are grouped into two categories based on manufacturer and packaging:

Littelfuse Series Substitutes (5KP30A-B, 3KP30A-TP): Same manufacturer, identical voltage ratings, compatible through-hole packages with variations in peak pulse current and power dissipation
Micro Commercial Co Substitutes (30KP30A-TP, 3KP30A-TP): Alternative manufacturer, identical voltage ratings, R-6 axial package with enhanced power handling capabilities

Parameter Comparison

Parameter	3KP30A-B (Main)	5KP30A-B	30KP30A-TP	3KP30A-TP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	30V	30V	30V	30V
Voltage - Breakdown (Min)	33.3V	33.3V	34.61V	33.3V
Voltage - Clamping (Max) @ Ipp	48.4V	48.4V	55.2V	48.4V
Current - Peak Pulse (10/1000µs)	62A	105.4A	—	—
Power - Peak Pulse	3000W	5000W	30000W	3000W
Operating Temperature	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	P600, Axial	P600, Axial	R-6, Axial	R-6, Axial
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

5KP30A-B is the primary direct substitute for the 3KP30A-B. Both parts share identical voltage ratings (30V standoff, 33.3V breakdown minimum, 48.4V clamping maximum), the same through-hole P600 axial package, and equivalent thermal performance. The 5KP30A-B is manufactured by Littelfuse Inc. with active product status and ROHS3 compliance. The increased peak pulse current (105.4A versus 62A) and power dissipation (5000W versus 3000W) provide enhanced transient protection capability without compromising circuit compatibility.

3KP30A-TP (Micro Commercial Co) is a functional equivalent with identical voltage and power specifications to the original 3KP30A-B. This part maintains the 30V standoff voltage, 33.3V breakdown minimum, and 48.4V clamping voltage. The R-6 axial package is mechanically compatible with P600 footprints in through-hole applications. Active product status and ROHS3 compliance ensure long-term availability and regulatory compliance.

30KP30A-TP (Micro Commercial Co) is suitable for applications requiring enhanced transient protection. While maintaining the 30V standoff voltage specification, this part exhibits a higher clamping voltage (55.2V) and significantly increased power dissipation capability (30000W). This substitute is appropriate only when circuit design permits the higher clamping voltage threshold.

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the 5KP30A-B directly replace the 3KP30A-B in existing designs?

A: Yes. The 5KP30A-B maintains identical voltage ratings and package compatibility. The increased current and power ratings provide equivalent or superior protection without requiring circuit redesign.

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 mechanically compatible in standard through-hole PCB layouts. Component lead spacing and footprint dimensions are equivalent for practical substitution purposes.

Q: Why does the 30KP30A-TP have a higher clamping voltage (55.2V) than the original part (48.4V)?

A: The 30KP30A-TP is rated for significantly higher power dissipation (30000W versus 3000W). The higher clamping voltage is a characteristic of this higher-power device class. Substitution is valid only if circuit protection thresholds permit this voltage level.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 5KP30A-B, 30KP30A-TP, and 3KP30A-TP are all ROHS3 compliant with MSL 1 rating, matching the original 3KP30A-B specifications.

Q: What is the impact of the obsolete status of the 3KP30A-B?

A: The original part is no longer manufactured. All listed substitutes have active product status, ensuring continued availability for new designs and replacement applications. Existing inventory of the 3KP30A-B should be transitioned to active substitute parts.

Q: Can I use the 3KP30A-TP as a direct replacement?

A: Yes. The 3KP30A-TP maintains identical voltage and power specifications to the original 3KP30A-B. The R-6 package is mechanically compatible with P600 footprints in through-hole applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message