5KP170A-B Equivalent & Substitute Parts

Part Overview

The 5KP170A-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This axial through-hole component operates across a wide temperature range (-55°C to 175°C) and is RoHS3 compliant. The part is currently active in production with 1088 units in stock.

Substitute parts are necessary when the original component becomes unavailable, when alternative packaging or performance characteristics better suit specific circuit requirements, or when supply chain optimization is needed while maintaining equivalent electrical protection.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	189V
Voltage - Clamping (Max) @ Ipp	275V
Current - Peak Pulse (10/1000µs)	18.5A
Power - Peak Pulse	5000W (5kW)
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 5KP170A-B is determined by the following critical parameters:

Voltage Parameters: Reverse standoff voltage, breakdown voltage minimum, and clamping voltage must fall within acceptable ranges to ensure equivalent overvoltage protection. The 5KP170A-B operates at 170V standoff with 275V maximum clamping.

Current and Power Ratings: Peak pulse current (18.5A) and peak pulse power (5kW) define the energy dissipation capability. Substitutes must maintain comparable or superior current handling to ensure adequate transient suppression.

Package and Mounting: The P600 axial through-hole package is a primary constraint. Substitutes in different packages (DO-201, DO-204AL, DO-15) represent alternative form factors with different current and power ratings.

Temperature Range: Operating temperature of -55°C to 175°C is standard across all listed substitutes.

Compliance: RoHS3 compliance and REACH unaffected status are maintained across all substitutes.

Substitutes are grouped into three categories based on power rating and package type: 5kW series (5KP180A), 1.5kW series (1.5KE180A, 1.5KE200A, 1.5KE220A), and 400W series (P4KE180A, P4KE200A, P4KE220A, P6KE180A, P6KE200A, P6KE220A).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	RoHS Status
5KP170A-B	Littelfuse Inc.	170V	275V	18.5A	5000W	P600, Axial	ROHS3 Compliant
5KP180A	Littelfuse Inc.	180V	292V	17.5A	5000W	P600, Axial	ROHS3 Compliant
1.5KE180A	Taiwan Semiconductor Corporation	154V	246V	6.4A	1500W	DO-201AA, DO-27, Axial	ROHS3 Compliant
1.5KE200A	Taiwan Semiconductor Corporation	171V	274V	5.7A	1500W	DO-201AA, DO-27, Axial	ROHS3 Compliant
1.5KE220A	Taiwan Semiconductor Corporation	185V	328V	4.8A	1500W	DO-201AA, DO-27, Axial	ROHS3 Compliant
P4KE180A	Taiwan Semiconductor Corporation	154V	246V	1.7A	400W	DO-204AL, DO-41, Axial	ROHS3 Compliant
P4KE200A	Good-Ark Semiconductor	171V	274V	1.5A	400W	DO-204AL, DO-41, Axial	ROHS3 Compliant
P4KE220A	Taiwan Semiconductor Corporation	185V	328V	1.3A	400W	DO-204AL, DO-41, Axial	ROHS3 Compliant
P6KE180A	Fairchild Semiconductor	154V	246V	2.5A	600W	DO-204AC, DO-15, Axial	Not specified
P6KE200A	Fairchild Semiconductor	171V	274V	2.2A	600W	DO-204AC, DO-15, Axial	Not specified
P6KE220A	Fairchild Semiconductor	185V	328V	1.9A	600W	DO-204AC, DO-15, Axial	Not specified

Engineering Selection Recommendations

Direct Equivalent (Same Package, Same Power Rating)

The 5KP180A is the closest substitute, maintaining the same P600 axial package and 5kW peak pulse power rating as the 5KP170A-B. Both are manufactured by Littelfuse Inc. and are RoHS3 compliant. The 5KP180A operates at a slightly higher reverse standoff voltage (180V vs. 170V) with marginally lower peak pulse current (17.5A vs. 18.5A), making it suitable for applications requiring protection in the 170–180V range.

Alternative Power Ratings with Voltage Compatibility

The 1.5KE series (1.5KE180A, 1.5KE200A, 1.5KE220A) provides 1500W peak pulse power in DO-201 axial packages. These parts are suitable for lower-energy transient environments where the full 5kW capability is not required. The 1.5KE200A most closely matches the 5KP170A-B voltage profile (171V standoff, 274V clamping) while reducing power dissipation requirements.

The P4KE series (P4KE180A, P4KE200A, P4KE220A) and P6KE series (P6KE180A, P6KE200A, P6KE220A) offer 400W and 600W ratings respectively in smaller DO-204AL and DO-15 packages. These are appropriate for space-constrained designs or lower-current transient suppression applications.

Compliance Considerations

All 1.5KE and P4KE series substitutes maintain RoHS3 compliance and REACH unaffected status. The P6KE series from Fairchild Semiconductor does not specify RoHS status in the provided data; verification with the manufacturer is necessary if RoHS3 compliance is a design requirement.

Voltage Matching Strategy

For applications requiring protection near 170V, select substitutes with reverse standoff voltage between 154V and 185V. The 1.5KE200A (171V) and P4KE200A (171V) provide the closest voltage alignment to the original 5KP170A-B specification.

Frequently Asked Questions (FAQ)

Q: Can I use the 5KP180A as a direct replacement for the 5KP170A-B?

A: Yes. Both parts share the same P600 axial package, 5kW peak pulse power rating, and operating temperature range. The 5KP180A operates at 180V reverse standoff compared to 170V on the original part. This 10V difference is within typical circuit tolerance margins for general-purpose overvoltage protection. Both are manufactured by Littelfuse Inc. and are RoHS3 compliant.

Q: What is the difference between the 5KP, 1.5KE, P4KE, and P6KE series?

A: These designations indicate power rating and package type. The 5KP series delivers 5kW in a P600 package. The 1.5KE series provides 1500W in a DO-201 package. The P4KE series offers 400W in a DO-204AL package. The P6KE series delivers 600W in a DO-15 package. Selection depends on available board space, transient energy levels, and current handling requirements.

Q: Can I substitute a lower-power part (P4KE or P6KE) for the 5KP170A-B?

A: Lower-power substitutes are only suitable if your circuit's transient energy is confirmed to be below their rated power dissipation. The 5KP170A-B is rated for 5kW peak pulse power. Using a 400W or 600W part in a 5kW environment will result in component failure. Verify transient energy requirements before selecting a lower-power alternative.

Q: Do all substitute parts have the same operating temperature range?

A: The 5KP170A-B, 5KP180A, 1.5KE series, and P4KE series all operate from -55°C to 175°C. The P6KE series operates from -50°C to 175°C, a 5°C narrower lower temperature limit. For applications requiring -55°C operation, avoid P6KE substitutes.

Q: Are the 1.5KE and P4KE parts suitable for the same applications as the 5KP170A-B?

A: These parts are suitable only for applications with lower transient energy requirements. The 1.5KE series handles 1500W and the P4KE series handles 400W, compared to 5kW for the 5KP170A-B. If your circuit experiences high-energy transients, these lower-power alternatives will not provide adequate protection. Confirm transient specifications before substitution.

Q: What is the significance of the voltage ratings (standoff, breakdown, clamping)?

A: Reverse standoff voltage is the maximum continuous voltage the diode can withstand without conducting. Breakdown voltage is the minimum voltage at which the diode begins to conduct. Clamping voltage is the maximum voltage across the diode during a transient pulse. For protection, the clamping voltage must be low enough to protect downstream components while the standoff voltage must exceed normal operating voltage.

Q: Can I use P4KE200A or 1.5KE200A if my circuit operates at 170V?

A: Yes, both parts have reverse standoff voltages (171V and 171V respectively) that accommodate 170V operation. However, verify that the peak pulse power rating matches your transient energy. The P4KE200A is rated for 400W and the 1.5KE200A for 1500W. If your circuit generates transients exceeding these levels, these parts will not provide adequate protection.

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