P4KE170A-B Equivalent & Substitute Parts

Part Overview

The P4KE170A-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates across a temperature range of -55°C to 175°C and is RoHS3 compliant. The part is currently active in production with 658 units in stock. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative packaging or performance requirements within the same functional category.

Substiute Parts

P4KE170A-B

Littelfuse Inc.In Stock: 713P4KE170A-B Datasheet

Current PartRFQ

1.5KE150A

Taiwan Semiconductor CorporationIn Stock: 304041.5KE150A Datasheet

MFR RecommendedRFQ

P4KE170A

Taiwan Semiconductor CorporationIn Stock: 1050P4KE170A Datasheet

MFR RecommendedRFQ

P6KE170A

Fairchild SemiconductorIn Stock: 15563P6KE170A Datasheet

MFR RecommendedRFQ

P6KE150A-TP

Micro Commercial CoIn Stock: 5168P6KE150A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes is determined by the following critical parameters: voltage rating (reverse standoff and breakdown), clamping voltage, peak pulse current capability, power dissipation, package compatibility, and thermal operating range. Substitute parts must maintain functional equivalence within the application's overvoltage protection requirements.

The identified substitute parts are grouped as follows:

Direct Equivalents (Same Voltage Rating - 145V Standoff):

• P4KE170A (Taiwan Semiconductor Corporation): Identical electrical specifications with different packaging (Tape & Reel vs. Bulk)
• P6KE170A (Fairchild Semiconductor): Same voltage rating and clamping voltage; higher peak pulse current (2.6A vs. 1.8A) and power rating (600W vs. 400W); different package (DO-15 vs. DO-41)

Lower Voltage Alternatives (128V Standoff):

• 1.5KE150A (Taiwan Semiconductor Corporation): Lower voltage rating (128V standoff, 143V breakdown); higher peak pulse current (7.6A) and power rating (1500W); different package (DO-201 vs. DO-41)
• P6KE150A-TP (Micro Commercial Co): Lower voltage rating (128V standoff, 143V breakdown); higher peak pulse current (2.9A) and power rating (600W); different package (DO-15 vs. DO-41)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Voltage Protection Level):

P4KE170A (Taiwan Semiconductor Corporation) is the closest equivalent, offering identical electrical performance with the same 145V reverse standoff voltage, 162V breakdown voltage, and 234V clamping voltage. The primary difference is packaging format (Tape & Reel vs. Bulk). This part is suitable for applications requiring the same protection threshold and is RoHS3 compliant with active product status.

P6KE170A (Fairchild Semiconductor) maintains the same voltage ratings but provides enhanced current handling (2.6A vs. 1.8A) and power dissipation (600W vs. 400W). The package differs (DO-15 vs. DO-41), requiring PCB layout adjustment. This part is appropriate for applications with higher transient current demands while maintaining the same voltage protection level.

For Lower Voltage Applications:

1.5KE150A (Taiwan Semiconductor Corporation) and P6KE150A-TP (Micro Commercial Co) both operate at 128V reverse standoff voltage, suitable only for applications where lower voltage protection is acceptable. These parts offer significantly higher current and power ratings. Package compatibility must be verified for PCB integration.

Compliance Considerations:

All recommended substitutes maintain RoHS3 compliance and active product status. Operating temperature ranges are consistent across all parts (-55°C to 175°C), with P6KE170A operating from -50°C minimum. Selection should prioritize parts with confirmed RoHS3 compliance for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can P4KE170A replace P4KE170A-B directly?

A: Yes. P4KE170A provides identical electrical specifications (145V standoff, 162V breakdown, 234V clamping, 1.8A peak pulse current, 400W power rating). The difference is packaging format: P4KE170A-B is supplied in Bulk, while P4KE170A is supplied in Tape & Reel. Both are through-hole DO-204AL (DO-41) packages and are functionally interchangeable.

Q: What is the difference between P6KE170A and P4KE170A-B?

A: Both maintain identical voltage ratings (145V standoff, 234V clamping). P6KE170A provides higher peak pulse current (2.6A vs. 1.8A) and power dissipation (600W vs. 400W). The package differs: P6KE170A uses DO-15 (DO-204AC) while P4KE170A-B uses DO-41 (DO-204AL). PCB footprint compatibility must be confirmed before substitution.

Q: Can lower voltage parts (1.5KE150A or P6KE150A-TP) be used as substitutes?

A: Lower voltage parts are suitable only if the application can tolerate 128V reverse standoff voltage instead of 145V. These parts offer higher current and power ratings but provide less overvoltage margin. Use only if circuit design permits the reduced voltage protection threshold.

Q: What package considerations apply to these substitutes?

A: P4KE170A-B and P4KE170A use DO-41 (DO-204AL) packages. P6KE170A and P6KE150A-TP use DO-15 (DO-204AC) packages. 1.5KE150A uses DO-27 (DO-201AA) package. Each package has different physical dimensions and PCB footprints. Verify mechanical compatibility with existing circuit board layouts before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: P4KE170A, 1.5KE150A, and P6KE150A-TP are confirmed RoHS3 compliant. P6KE170A compliance status is not specified in available documentation. Verify RoHS3 compliance with the manufacturer or distributor for regulated applications.

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

A: P4KE170A-B, P4KE170A, 1.5KE150A, and P6KE150A-TP operate from -55°C to 175°C (TJ). P6KE170A operates from -50°C to 175°C (TJ). For applications requiring -55°C minimum operation, P6KE170A may not be suitable.