5KP78CE3/TR13 Equivalent & Substitute Parts

Part Overview

The 5KP78CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This bidirectional Zener diode operates with a reverse standoff voltage of 78V and provides peak pulse power dissipation of 5000W. The component is housed in a P600 axial package and is rated for through-hole mounting with an operating temperature range of -55°C to 175°C. The part maintains Active product status and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching or compatible electrical characteristics, including reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current capability, and power dissipation ratings. Substitute parts may differ in peak pulse current capacity and clamping voltage within acceptable engineering tolerances while maintaining the same voltage class and package form factor.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	78	V
Breakdown Voltage (Min)	86.7	V
Clamping Voltage (Max) @ Ipp	139	V
Peak Pulse Current (10/1000µs)	36	A
Peak Pulse Power	5000	W
Package / Case	P600, Axial	—
Mounting Type	Through Hole	—
Operating Temperature Range	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 5KP78CE3/TR13 are grouped into two categories based on power dissipation capability and peak pulse current rating:

Category 1: Same Power Class (5kW) Parts maintaining 5000W peak pulse power dissipation with 78V reverse standoff voltage. These substitutes operate within the same thermal and electrical envelope as the original part.

Category 2: Higher Power Class (15kW and 30kW) Parts with elevated peak pulse power ratings (15000W and 30000W) while maintaining the same 78V reverse standoff voltage. These provide enhanced transient suppression capability for applications requiring greater energy absorption.

Key Parameters Determining Substitution:

Reverse Standoff Voltage: 78V (fixed across all substitutes)
Breakdown Voltage (Min): 86.7V to 87.1V (acceptable range)
Package / Case: P600 or R-6 axial through-hole
Bidirectional Channels: 1 (single channel)
Type: Zener diode
Operating Temperature: -55°C to 175°C
RoHS Status: ROHS3 Compliant

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	RoHS Status
5KP78CE3/TR13	Microchip Technology	78	86.7	139	36	5000	P600	ROHS3
5KP78CA	Littelfuse Inc.	78	86.7	126	40.5	5000	P600	ROHS3
5KP78CA-TP	Micro Commercial Co	78	86.7	126	—	5000	R-6	ROHS3
15KPA78CA	MDE Semiconductor Inc	78	87.1	126.1	119.7	15000	P600	ROHS3
15KPA78CA-B	Littelfuse Inc.	78	87.1	126.1	119.7	15000	P600	ROHS3
30KPA78CA	MDE Semiconductor Inc	78	87.1	129	234	30000	P600	ROHS3
30KPA78CA-B	Littelfuse Inc.	78	87.1	129	234.9	30000	P600	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Same Power Class): The 5KP78CA (Littelfuse Inc.) and 5KP78CA-TP (Micro Commercial Co) are direct substitutes maintaining identical 5000W peak pulse power dissipation. Both parts are ROHS3 compliant and operate within the same temperature range. The 5KP78CA is available in P600 package (standard axial), while 5KP78CA-TP uses R-6 package variant. Selection between these depends on specific board layout requirements and package compatibility.

For Enhanced Protection (Higher Power Class): The 15KPA78CA, 15KPA78CA-B, 30KPA78CA, and 30KPA78CA-B series provide increased transient suppression capability with 15kW and 30kW peak pulse power ratings respectively. These parts maintain the same 78V reverse standoff voltage and are suitable for applications requiring greater energy absorption. All higher-power substitutes are available in P600 package and are ROHS3 compliant.

Compliance Considerations: All substitute parts listed maintain ROHS3 compliance and operate across the -55°C to 175°C temperature range. Parts from Littelfuse Inc. (5KP78CA, 15KPA78CA-B, 30KPA78CA-B) carry REACH Unaffected status. Parts from MDE Semiconductor Inc. (15KPA78CA, 30KPA78CA) have REACH information available upon request. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can the 5KP78CA directly replace the 5KP78CE3/TR13? A: Yes. Both parts share identical reverse standoff voltage (78V), breakdown voltage (86.7V), peak pulse power (5000W), and P600 axial package. The 5KP78CA is manufactured by Littelfuse Inc. and is ROHS3 compliant. Clamping voltage differs slightly (126V vs. 139V), and peak pulse current is marginally higher (40.5A vs. 36A), both within acceptable engineering tolerance for the same power class.

Q: What is the difference between 5KP78CA and 15KPA78CA? A: The primary difference is peak pulse power dissipation: 5KP78CA provides 5000W while 15KPA78CA provides 15000W. Both maintain 78V reverse standoff voltage and P600 package. The 15KPA78CA series is suitable for applications requiring enhanced transient energy absorption. Peak pulse current increases from 40.5A to 119.7A accordingly.

Q: Are the 5KP78CA-TP and 5KP78CA interchangeable? A: Both parts are electrically equivalent with 78V reverse standoff voltage and 5000W peak pulse power. The primary difference is package form: 5KP78CA uses P600 package while 5KP78CA-TP uses R-6 package. Package selection depends on board layout and mounting requirements. Verify footprint compatibility before substitution.

Q: Can I use a 30KPA78CA-B in place of the 5KP78CE3/TR13? A: Yes, from an electrical standpoint. The 30KPA78CA-B maintains the same 78V reverse standoff voltage and operates across the same temperature range. However, it provides 30000W peak pulse power versus 5000W in the original part. This substitution is suitable only if the application circuit can accommodate the higher power rating without thermal or electrical complications. Verify thermal management and circuit design compatibility.

Q: What does the "-B" suffix indicate in part numbers like 15KPA78CA-B? A: The "-B" suffix indicates a variant designation from Littelfuse Inc. Parts with this suffix (15KPA78CA-B, 30KPA78CA-B) are functionally equivalent to their non-suffixed counterparts from MDE Semiconductor Inc. (15KPA78CA, 30KPA78CA) with matching electrical specifications and ROHS3 compliance.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed (5KP78CA, 5KP78CA-TP, 15KPA78CA, 15KPA78CA-B, 30KPA78CA, 30KPA78CA-B) are ROHS3 compliant. This ensures compatibility with environmental and regulatory requirements matching the original 5KP78CE3/TR13.

Q: What is the significance of the clamping voltage difference between parts? A: Clamping voltage (measured at peak pulse current) determines the maximum voltage the TVS diode allows across the protected circuit during transient events. The original 5KP78CE3/TR13 clamps at 139V maximum, while most substitutes clamp between 126V and 129V. Lower clamping voltage provides tighter voltage regulation but may require verification against circuit protection requirements. Ensure the substitute's clamping voltage is acceptable for the protected component's maximum voltage rating.

Q: Can I substitute based on packaging alone? A: No. Packaging (P600 vs. R-6) is a mechanical consideration only. Electrical parameters—reverse standoff voltage, breakdown voltage, peak pulse power, and current rating—must match or be compatible with application requirements. Always verify electrical specifications alongside package compatibility.

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