Equivalent & Substitute Parts for 3KP30-B TVS Diode

Part Overview

The 3KP30-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 30V reverse standoff voltage with a 50.82V maximum clamping voltage and 62A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for circuit protection requirements.

Key Parameters

Parameter	3KP30-B
Voltage - Reverse Standoff (Typ)	30V
Voltage - Breakdown (Min)	31.55V
Voltage - Clamping (Max) @ Ipp	50.82V
Current - Peak Pulse (10/1000µs)	62A
Power - Peak Pulse	3000W
Operating Temperature	-55°C ~ 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 of the 3KP30-B is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage must be 30V with breakdown voltage between 31.55V and 34.61V
Package Type: Through-hole axial configuration (P600 or R-6 packages acceptable)
Mounting: Through-hole technology for PCB compatibility
Temperature Range: Operating range of -55°C to 175°C (TJ)
Compliance: ROHS3 compliance required
Diode Type: Unidirectional Zener TVS diode

Substitute parts are grouped by power dissipation capability (3kW, 5kW, 15kW, and 30kW ratings) and peak pulse current handling. Parts with higher power ratings and peak pulse currents provide enhanced protection margins while maintaining the same voltage characteristics and package footprint compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Package / Case	Product Status
3KP30-B	Littelfuse Inc.	30V	31.55V	50.82V	62A	3000W	P600, Axial	Obsolete
5KP30A-B	Littelfuse Inc.	30V	33.3V	48.4V	105.4A	5000W	P600, Axial	Active
5KP30A-E3/54	Vishay General Semiconductor	30V	33.3V	48.4V	103A	5000W	P600, Axial	Active
5KP30A-TP	Micro Commercial Co	30V	33.3V	48.4V	—	5000W	R-6, Axial	Active
5KP30AHE3/54	Vishay General Semiconductor	30V	33.3V	48.4V	103A	5000W	P600, Axial	Active
5KP30AHE3/73	Vishay General Semiconductor	30V	33.3V	48.4V	103A	5000W	P600, Axial	Active
15KP30A-TP	Micro Commercial Co	30V	33.3V	50.7V	—	15000W	R-6, Axial	Active
15KPA30AE3/TR13	Microchip Technology	30V	34.61V	50.7V	297.8A	15000W	P600, Axial	Active
15KPA30E3/TR13	Microchip Technology	30V	31.59V	—	—	15000W	P600, Axial	Active
30KP30A-TP	Micro Commercial Co	30V	34.61V	55.2V	—	30000W	R-6, Axial	Active

Engineering Selection Recommendations

Direct Replacement (P600 Package, Same Footprint):

The 5KP30A-B, 5KP30A-E3/54, 5KP30AHE3/54, and 5KP30AHE3/73 are pin-compatible replacements in the P600 axial package. These parts maintain identical reverse standoff voltage (30V) and clamping voltage characteristics (48.4V) while providing increased peak pulse current (103–105.4A) and power dissipation (5000W). All are ROHS3 compliant and active products from established manufacturers.

Enhanced Protection (P600 Package):

The 15KPA30AE3/TR13 and 15KPA30E3/TR13 offer significantly higher power dissipation (15000W) in the same P600 package footprint. These Microchip Technology parts maintain 30V reverse standoff voltage and are suitable for applications requiring greater transient energy absorption while preserving mechanical compatibility.

Alternative Package (R-6 Axial):

The 5KP30A-TP and 15KP30A-TP use the R-6 axial package instead of P600. These parts are mechanically compatible with through-hole PCB designs but require verification of board layout spacing. The 5KP30A-TP provides 5000W protection, while 15KP30A-TP delivers 15000W capability.

Automotive Grade Option:

The 5KP30AHE3/54 and 5KP30AHE3/73 are AEC-Q101 qualified automotive-grade variants suitable for applications requiring automotive reliability standards while maintaining identical electrical performance to commercial-grade 5KP30A-E3/54.

Frequently Asked Questions (FAQ)

Q: Can I use a 5KP30A series part as a direct replacement for the 3KP30-B?

A: Yes. The 5KP30A series maintains the same 30V reverse standoff voltage and similar clamping voltage (48.4V vs. 50.82V). The P600 package variants (5KP30A-B, 5KP30A-E3/54, 5KP30AHE3/54, 5KP30AHE3/73) are pin-compatible and footprint-compatible. The increased peak pulse current (103–105.4A vs. 62A) and power rating (5000W vs. 3000W) provide enhanced protection margins.

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

A: Both are through-hole axial packages for the same voltage class. P600 and R-6 differ in physical dimensions and lead spacing. Verify PCB layout compatibility before selecting R-6 variants (5KP30A-TP, 15KP30A-TP, 30KP30A-TP). P600 packages (5KP30A-B, 5KP30A-E3/54, 15KPA30AE3/TR13, 15KPA30E3/TR13) provide direct mechanical compatibility with existing 3KP30-B footprints.

Q: Are higher power-rated parts (15kW, 30kW) backward compatible?

A: Yes. The 15KPA30AE3/TR13, 15KPA30E3/TR13, and 30KP30A-TP maintain the same 30V reverse standoff voltage and are electrically compatible. Higher power ratings indicate greater transient energy absorption capability without affecting normal circuit operation. Verify PCB thermal management if upgrading to 15kW or 30kW variants.

Q: Which substitute offers the closest electrical match to the 3KP30-B?

A: The 15KPA30AE3/TR13 provides the closest clamping voltage match (50.7V vs. 50.82V) while maintaining P600 package compatibility. This Microchip Technology part is active, ROHS3 compliant, and offers 15000W power dissipation with 297.8A peak pulse current.

Q: Can I use automotive-grade parts in non-automotive applications?

A: Yes. The 5KP30AHE3/54 and 5KP30AHE3/73 are AEC-Q101 qualified but function identically to commercial-grade equivalents in non-automotive circuits. These parts provide additional reliability assurance without performance trade-offs.

Q: What compliance certifications apply to all substitute parts?

A: All listed substitute parts are ROHS3 compliant. Microchip Technology variants (15KPA30AE3/TR13, 15KPA30E3/TR13) and Vishay parts (5KP30A-E3/54, 5KP30AHE3/54, 5KP30AHE3/73) carry REACH Unaffected status. All parts operate across the -55°C to 175°C temperature range.

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