5KP45CA-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP45CA-B is a bidirectional Zener transient voltage suppressor diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This through-hole P600 package device operates across a temperature range of -55°C to 175°C and maintains active product status with full RoHS3 compliance. Substitute parts are identified based on matching electrical performance parameters within the allowed tolerance ranges for reverse standoff voltage, clamping voltage, and peak pulse current specifications.

Key Parameters

Parameter	5KP45CA-B Value	Unit
Voltage - Reverse Standoff (Typ)	45	V
Voltage - Breakdown (Min)	50	V
Voltage - Clamping (Max) @ Ipp	72.7	V
Current - Peak Pulse (10/1000µs)	70.2	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 eligibility is determined by the following electrical parameters:

Voltage - Reverse Standoff (Typ): Acceptable range 40.2V to 48V
Voltage - Clamping (Max) @ Ipp: Acceptable range 64.8V to 77.4V
Current - Peak Pulse (10/1000µs): Acceptable range 6.7A to 70.2A
Power - Peak Pulse: Acceptable range 500W to 5000W
Type: Zener diode, bidirectional configuration
Mounting Type: Through Hole
Applications: General Purpose

Substitute parts are grouped into two categories based on package compatibility:

Category A - P600 Package (Direct Mechanical Fit): Parts maintaining the P600 axial package form factor.

Category B - Reduced Power Rating Packages (DO-201, DO-15): Parts with smaller package geometries and correspondingly lower power ratings, suitable for applications with reduced transient energy requirements.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Power - Peak Pulse (W)	Package	Operating Temp (°C)	RoHS Status
5KP45CA-B	Littelfuse	45	50	72.7	70.2	5000	P600	-55 to 175	ROHS3 Compliant
5KP45CA	Littelfuse Inc.	45	50	72.7	70.2	5000	P600	-55 to 175	ROHS3 Compliant
1.5KE47CA	Diotec Semiconductor	40.2	44.7	64.8	24	1500	DO-201	-50 to 175	Not applicable
1.5KE51CA	Taiwan Semiconductor Corporation	43.6	48.5	70.1	22	1500	DO-201	-55 to 175	ROHS3 Compliant
1.5KE56CA	Taiwan Semiconductor Corporation	47.8	53.2	77	20	1500	DO-201	-55 to 175	ROHS3 Compliant
P6KE47CA	Diotec Semiconductor	40.2	44.7	64.8	9.7	600	DO-15	-50 to 175	ROHS3 Compliant
P6KE51CA	Taiwan Semiconductor Corporation	43.6	48.5	70.1	8.6	600	DO-15	-55 to 175	ROHS3 Compliant
P6KE56CA	Taiwan Semiconductor Corporation	47.8	53.2	77	7.8	600	DO-15	-55 to 175	ROHS3 Compliant
SA48CA	Taiwan Semiconductor Corporation	48	53.3	77.4	6.7	500	DO-15	-55 to 175	ROHS3 Compliant

Engineering Selection Recommendations

5KP45CA (Littelfuse Inc.): Identical electrical and mechanical specifications to the 5KP45CA-B. Active product status with ROHS3 compliance and full temperature range support (-55°C to 175°C). Direct replacement maintaining P600 package form factor and 5000W peak pulse power rating.

1.5KE Series (Taiwan Semiconductor Corporation): 1.5KE51CA and 1.5KE56CA maintain active product status with ROHS3 compliance and full temperature range support. These DO-201 package devices provide reduced power dissipation (1500W) compared to the main part. Suitable for applications where transient energy levels are lower and package size reduction is acceptable. 1.5KE51CA provides closest voltage matching to the main part (43.6V reverse standoff, 70.1V clamping).

P6KE Series (Taiwan Semiconductor Corporation): P6KE51CA and P6KE56CA maintain active product status with ROHS3 compliance and full temperature range support. These DO-15 package devices provide further power reduction (600W) and smaller form factor. Applicable only to circuits with reduced transient energy requirements. P6KE51CA provides voltage characteristics closest to the main part (43.6V reverse standoff, 70.1V clamping).

SA48CA (Taiwan Semiconductor Corporation): Active product status with ROHS3 compliance and full temperature range support. DO-15 package with 500W peak pulse power rating. Reverse standoff voltage of 48V is at the upper boundary of the acceptable range.

1.5KE47CA (Diotec Semiconductor): Active product status with DO-201 package and 1500W power rating. Operating temperature range limited to -50°C to 175°C (does not extend to -55°C minimum). RoHS status not applicable.

P6KE47CA (Diotec Semiconductor): Active product status with DO-15 package and 600W power rating. Operating temperature range limited to -50°C to 175°C. RoHS status ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can 1.5KE51CA replace 5KP45CA-B in all applications?

A: 1.5KE51CA matches the reverse standoff voltage (43.6V) and clamping voltage (70.1V) within acceptable parameters. However, peak pulse current is reduced from 70.2A to 22A, and power dissipation is reduced from 5000W to 1500W. Substitution is valid only for circuits where transient energy levels do not exceed 1500W. Package change from P600 to DO-201 requires PCB layout modification.

Q: What is the difference between P6KE and 1.5KE series substitutes?

A: Both series provide reduced power ratings compared to the 5KP45CA-B. The 1.5KE series offers 1500W peak pulse power in DO-201 package, while P6KE series offers 600W peak pulse power in smaller DO-15 package. Voltage characteristics are comparable within each manufacturer's offerings. Selection depends on available transient energy and PCB space constraints.

Q: Is SA48CA suitable as a substitute?

A: SA48CA maintains reverse standoff voltage at 48V (upper boundary of acceptable range) and clamping voltage at 77.4V. Peak pulse current is reduced to 6.7A with 500W power rating. Substitution is valid only for low-energy transient protection applications. Package change from P600 to DO-15 requires PCB layout modification.

Q: Why do some substitutes have different operating temperature ranges?

A: Operating temperature range is a specified parameter for each part. 1.5KE47CA and P6KE47CA (Diotec Semiconductor) specify -50°C to 175°C, which does not extend to the -55°C minimum of the main part. These parts are unsuitable for applications requiring full -55°C to 175°C operation.

Q: Can I use a substitute with lower peak pulse current in a high-energy transient environment?

A: No. Peak pulse current rating indicates the maximum current the device can safely conduct during a transient event. Using a device with insufficient current rating will result in device failure or degraded performance. Application transient energy must not exceed the substitute part's power rating.

Q: What package considerations apply when selecting a substitute?

A: The main part uses P600 axial package. Substitutes using DO-201 or DO-15 packages have different physical dimensions and lead spacing. PCB layout and component placement must be modified accordingly. Mechanical fit verification is required before implementation.

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