5KP48C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP48C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 48V reverse standoff voltage, 5000W peak pulse power rating, and through-hole P600 axial packaging. The 5KP48C is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the 48V voltage class while accommodating variations in package types, power ratings, and clamping characteristics.

Key Parameters

Parameter	5KP48C Value	Unit
Voltage - Reverse Standoff (Typ)	48	V
Voltage - Breakdown (Min)	50.49	V
Voltage - Clamping (Max) @ Ipp	81.27	V
Power - Peak Pulse	5000	W
Bidirectional Channels	1	—
Type	Zener	—
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Operating Temperature	-55 to 175	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution for the 5KP48C is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 48V nominal class
Voltage - Breakdown (Min): Range 50.49V to 53.6V acceptable
Voltage - Clamping (Max) @ Ipp: 77.4V to 85.5V acceptable
Bidirectional Channels: 1 (single channel required)
Type: Zener diode
Applications: General Purpose

Secondary Compatibility Factors:

Power - Peak Pulse: 5000W or higher (5kW minimum for direct replacement)
Mounting Type: Through Hole
Operating Temperature: -50°C to 175°C minimum range
RoHS Status: ROHS3 Compliant preferred

Package Considerations: Substitutes are grouped by package type: P600 axial (direct mechanical replacement), DO-201 axial (voltage-compatible alternative), DO-15 axial (reduced power rating alternative), and R-6 axial (high-power alternative). Package selection depends on circuit board layout constraints and thermal management requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Power - Peak Pulse (W)	Package / Case	Product Status
5KP48C	Littelfuse Inc.	48	50.49	81.27	5000	P600, Axial	Obsolete
5KP48CA	Diotec Semiconductor	48	53.3	77.4	5000	P600, Axial	Active
5KP48CE3/TR13	Microchip Technology	48	53.3	85.5	5000	P600, Axial	Active
30KP48CA-TP	Micro Commercial Co	48	53.6	81.6	30000	R-6, Axial	Active
1.5KE56CA	Taiwan Semiconductor Corporation	47.8	53.2	77	1500	DO-201AA, Axial	Active
1.5KE51CA	Taiwan Semiconductor Corporation	43.6	48.5	70.1	1500	DO-201AA, Axial	Active
1.5KE47CA	Diotec Semiconductor	40.2	44.7	64.8	1500	DO-201AA, Axial	Active
P6KE51CA	Taiwan Semiconductor Corporation	43.6	48.5	70.1	600	DO-204AC, Axial	Active
P6KE47CA	Diotec Semiconductor	40.2	44.7	64.8	600	DO-204AC, Axial	Active
SA48CA	Taiwan Semiconductor Corporation	48	53.3	77.4	500	DO-204AC, Axial	Active
1N6124	Semtech Corporation	42.6	50.4	80.7	500	Axial	Discontinued

Engineering Selection Recommendations

Direct Replacement (Same Package, Same Power Rating):

5KP48CA (Diotec Semiconductor) and 5KP48CE3/TR13 (Microchip Technology) are active production alternatives in P600 axial packaging with 5000W peak pulse power. Both maintain the 48V voltage class and are ROHS3 compliant. 5KP48CA offers 77.4V clamping voltage; 5KP48CE3/TR13 provides 85.5V clamping voltage. Selection between these depends on clamping voltage tolerance requirements for the protected circuit.

High-Power Alternative (Enhanced Dissipation):

30KP48CA-TP (Micro Commercial Co) provides 30kW peak pulse power in R-6 axial packaging, maintaining 48V voltage class and ROHS3 compliance. This option is suitable for applications requiring enhanced transient energy absorption beyond the 5kW specification.

Reduced Power Alternatives (Lower Dissipation Requirements):

1.5KE56CA (Taiwan Semiconductor Corporation) maintains closest voltage alignment to 5KP48C (47.8V standoff) with 1500W power rating in DO-201 packaging. This part is AEC-Q101 qualified for automotive applications and ROHS3 compliant.

Compact Package Alternatives (Space-Constrained Designs):

SA48CA (Taiwan Semiconductor Corporation) and P6KE51CA (Taiwan Semiconductor Corporation) offer DO-15 (DO-204AC) compact axial packaging with 48V and 43.6V standoff voltages respectively. These are suitable for applications where board space is limited, though power dissipation is reduced to 500W and 600W respectively.

Avoid:

1N6124 (Semtech Corporation) is discontinued at DiGi Electronics and should not be selected for new designs despite active inventory availability.

Frequently Asked Questions (FAQ)

Q: Can 5KP48CA directly replace 5KP48C in existing designs?

A: Yes. 5KP48CA maintains identical P600 axial packaging, 48V voltage class, and 5000W power rating. The primary difference is clamping voltage (77.4V vs 81.27V), which is within acceptable tolerance for most general-purpose protection circuits. Verify circuit-specific clamping voltage requirements before substitution.

Q: What is the difference between P600 and DO-201 packaging?

A: P600 is a larger axial package designed for higher power dissipation (5000W). DO-201 is a smaller axial package suitable for 1500W applications. DO-201 parts cannot replace P600 parts in high-energy transient environments due to reduced thermal capacity.

Q: Why is 1.5KE47CA listed as a substitute if its voltage rating is 40.2V instead of 48V?

A: 1.5KE47CA is included because it was listed in the original 5KP48C substitute list. However, the 40.2V standoff voltage represents a significant deviation from the 48V class. This part should only be selected if circuit protection requirements specifically allow lower voltage thresholds.

Q: Is SA48CA suitable for high-energy transient protection?

A: SA48CA maintains 48V voltage class and ROHS3 compliance but is limited to 500W peak pulse power. It is suitable only for low-energy transient environments. For applications requiring 5000W dissipation, select 5KP48CA, 5KP48CE3/TR13, or 30KP48CA-TP.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended active substitutes are ROHS3 compliant, ensuring regulatory compliance for new designs.

Q: Can I use multiple lower-power parts in parallel to replace 5KP48C?

A: Parallel connection of TVS diodes is not recommended without detailed thermal and electrical analysis. Unequal current distribution and thermal coupling between devices can result in premature failure. Select a single part with appropriate power rating instead.

Q: What is the significance of Current - Peak Pulse (Ipp) in the parameter table?

A: Ipp defines the peak current the TVS diode can conduct during a transient event at specified clamping voltage. Higher Ipp values indicate greater transient current handling capacity. 5KP48C does not specify Ipp; active substitutes range from 6.2A to 65A depending on package and power rating.

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