5KP6.5CA-B Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The 5KP6.5CA-B is an active-status, through-hole mounted transient voltage suppressor diode manufactured by Littelfuse Inc. in the 5KP series. This bidirectional zener TVS diode is designed for general-purpose overvoltage protection applications with a 6.5V reverse standoff voltage and 11.2V maximum clamping voltage at peak pulse current. The device is rated for 5000W peak pulse power dissipation and operates across the industrial temperature range of -55°C to 175°C. Finding equivalent and substitute parts is necessary when the original part is unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from different suppliers is needed to optimize inventory and cost management.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	6.5	V
Voltage - Breakdown (Min)	7.22	V
Voltage - Clamping (Max) @ Ipp	11.2	V
Current - Peak Pulse (10/1000µs)	455.4	A
Power - Peak Pulse	5000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 5KP6.5CA-B is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 6.5V nominal
Voltage - Clamping (Max) @ Ipp: 11.2V nominal
Power - Peak Pulse: 5000W minimum
Bidirectional Channels: 1
Type: Zener
Mounting Type: Through Hole
Operating Temperature Range: -55°C to 175°C minimum

Secondary Compatibility Factors:

Package / Case format (P600 axial preferred; alternative axial packages acceptable with mechanical verification)
Current - Peak Pulse rating (455.4A or higher acceptable)
RoHS3 compliance required
Product Status: Active

Substitute parts are grouped into two categories:

Category A — Direct Electrical Equivalents (Same Voltage Class, Same Power Rating): Parts with identical or equivalent reverse standoff voltage (6.5V), clamping voltage (11.2V), and 5000W power rating in P600 or compatible axial packages.

Category B — Functional Alternatives (Adjacent Voltage Classes, Lower Power Ratings): Parts with adjacent reverse standoff voltages (6.0V or 6.4V) and lower power ratings (400W to 600W) in alternative axial packages (DO-204AL, DO-204AC). These are suitable only when circuit design permits lower power dissipation capability and voltage tolerance adjustment.

Parameter Comparison

Part Number	Manufacturer	Vr Standoff (V)	Vc Clamp (V)	Ipp (A)	Power (W)	Package	Temp Range (°C)	RoHS
5KP6.5CA-B	Littelfuse Inc.	6.5	11.2	455.4	5000	P600, Axial	-55 to 175	ROHS3
5KP6.0CA	Littelfuse Inc.	6.0	10.3	495.1	5000	P600, Axial	-55 to 175	ROHS3
5KP6.5CA	Diotec Semiconductor	6.5	11.2	446	5000	P600, Axial	-50 to 175	ROHS3
5KP6.5CA-TP	Micro Commercial Co	6.5	11.2	—	5000	R-6, Axial	-55 to 175	ROHS3
SA6.0CA	Taiwan Semiconductor Corporation	6.0	10.3	50	500	DO-204AC (DO-15), Axial	-55 to 175	ROHS3
P4KE6.8CA	Taiwan Semiconductor Corporation	5.8	10.5	40	400	DO-204AL (DO-41), Axial	-55 to 175	ROHS3
P4KE7.5CA	Taiwan Semiconductor Corporation	6.4	11.3	37	400	DO-204AL (DO-41), Axial	-55 to 175	ROHS3
P6KE6.8CA	Taiwan Semiconductor Corporation	5.8	10.5	60	600	DO-204AC (DO-15), Axial	-55 to 175	ROHS3
P6KE7.5CA	Taiwan Semiconductor Corporation	6.4	11.3	55	600	DO-204AC (DO-15), Axial	-55 to 175	ROHS3
P6KE8.2CA	Taiwan Semiconductor Corporation	7.02	12.1	52	600	DO-204AC (DO-15), Axial	-55 to 175	ROHS3
1.5KE6V8CA	STMicroelectronics	5.8	13.4	746	1500	DO-201AA (DO-27), Axial	-55 to 175	ROHS3

Engineering Selection Recommendations

Direct Substitutes (Recommended for Pin-Compatible Replacement):

The 5KP6.5CA (Diotec Semiconductor) and 5KP6.5CA-TP (Micro Commercial Co) are direct electrical equivalents with identical reverse standoff voltage (6.5V) and clamping voltage (11.2V) specifications. Both maintain the 5000W power rating and through-hole axial mounting configuration. The 5KP6.5CA-TP uses an R-6 package variant instead of P600 but remains mechanically compatible for standard through-hole PCB applications. Both parts carry ROHS3 compliance and active product status. The 5KP6.5CA from Diotec operates at a minimum temperature of -50°C versus -55°C for the original part; this is acceptable for most industrial applications but should be verified against circuit requirements.

Functional Alternatives (Acceptable with Circuit Verification):

The 5KP6.0CA (Littelfuse Inc.) provides identical 5000W power rating and P600 package compatibility with a lower reverse standoff voltage of 6.0V and clamping voltage of 10.3V. This part is suitable when circuit design permits a 0.5V reduction in standoff voltage and 0.9V reduction in clamping voltage. The higher peak pulse current (495.1A) provides additional margin.

The SA6.0CA (Taiwan Semiconductor Corporation) matches the 6.0V standoff voltage and 10.3V clamping voltage but operates at reduced power (500W) in a DO-204AC (DO-15) package. This part is suitable only for applications where peak pulse power does not exceed 500W and where the smaller DO-15 package footprint is acceptable.

The P6KE series (P6KE6.8CA, P6KE7.5CA, P6KE8.2CA) from Taiwan Semiconductor Corporation provides 600W power rating in DO-204AC (DO-15) packages with voltage ratings spanning 5.8V to 7.02V standoff. These are suitable only for low-power transient suppression applications and are not recommended as direct replacements for 5000W applications.

The P4KE series (P4KE6.8CA, P4KE7.5CA) provides 400W power rating in DO-204AL (DO-41) packages. These are suitable only for applications with significantly reduced power dissipation requirements.

The 1.5KE6V8CA (STMicroelectronics) provides 1500W power rating in a DO-201AA (DO-27) package with a 5.8V standoff voltage. This part is not recommended as a direct substitute due to lower power rating and different package format.

All recommended substitutes maintain ROHS3 compliance, active product status, and through-hole mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can I use the 5KP6.0CA as a direct replacement for the 5KP6.5CA-B?

A: The 5KP6.0CA is electrically compatible for general-purpose transient suppression with the same 5000W power rating and P600 package. However, it operates at a lower reverse standoff voltage (6.0V versus 6.5V) and lower clamping voltage (10.3V versus 11.2V). This substitution is acceptable only if circuit design permits these voltage reductions. Verify that the protected circuit can tolerate the lower clamping voltage without exceeding component ratings.

Q: What is the difference between the 5KP6.5CA-B and 5KP6.5CA-TP?

A: Both parts are electrically identical with 6.5V standoff voltage, 11.2V clamping voltage, and 5000W power rating. The primary difference is packaging: 5KP6.5CA-B uses P600 package format (Bulk), while 5KP6.5CA-TP uses R-6 package format (Cut Tape). Both are through-hole axial devices and are mechanically compatible for standard PCB applications. The choice between them depends on manufacturing process requirements (bulk versus tape-and-reel).

Q: Can I use a P6KE or P4KE series part instead of the 5KP6.5CA-B?

A: The P6KE and P4KE series parts are not recommended as direct replacements. These parts operate at significantly lower power ratings (400W to 600W versus 5000W) and use different package formats (DO-204AL or DO-204AC versus P600). They are suitable only for low-power transient suppression applications. Using these parts in a 5000W application would result in inadequate power dissipation capability and potential device failure.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this document carry ROHS3 compliance certification, matching the compliance status of the original 5KP6.5CA-B part.

Q: What is the operating temperature range for substitute parts?

A: Most substitute parts operate across the full industrial temperature range of -55°C to 175°C, matching the original part. The exception is the 5KP6.5CA (Diotec Semiconductor), which operates from -50°C to 175°C. Verify that this reduced low-temperature specification is acceptable for your application before substitution.

Q: Can I substitute the 5KP6.5CA-B with the SA6.0CA?

A: The SA6.0CA is not recommended as a direct substitute. While it matches the 6.0V standoff voltage and 10.3V clamping voltage of the 5KP6.0CA, it operates at only 500W power rating versus the required 5000W. Additionally, it uses a DO-204AC (DO-15) package instead of P600, requiring PCB layout modification. This part is suitable only for low-power applications.

Q: What packaging formats are available for the 5KP6.5CA-B equivalent parts?

A: The primary equivalent parts are available in the following through-hole axial packages: P600 (5KP6.5CA-B, 5KP6.0CA), R-6 (5KP6.5CA-TP), and DO-204AC/DO-15 (SA6.0CA). All are through-hole mounted and suitable for standard PCB assembly. Package selection depends on manufacturing process compatibility and PCB footprint requirements.

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