P4KE350 Equivalent & Substitute Parts

Part Overview

The P4KE350 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 300V reverse standoff voltage, 506.1V maximum clamping voltage, and 400W peak pulse power rating in a DO-204AL (DO-41) through-hole axial package. The P4KE350 is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system designs and maintenance applications. Substitute parts must maintain compatibility across electrical performance parameters, mechanical form factor, and thermal operating range to ensure reliable circuit protection without redesign.

Substiute Parts

P4KE350

Littelfuse Inc.In Stock: 950P4KE350 Datasheet

Current PartRFQ

P4KE350A

Taiwan Semiconductor CorporationIn Stock: 4288P4KE350A Datasheet

DirectRFQ

1.5KE300A

Good-Ark SemiconductorIn Stock: 752741.5KE300A Datasheet

MFR RecommendedRFQ

1.5KE350A

Taiwan Semiconductor CorporationIn Stock: 124811.5KE350A Datasheet

MFR RecommendedRFQ

P6KE350A

Fairchild SemiconductorIn Stock: 24503P6KE350A Datasheet

MFR RecommendedRFQ

P4KE350A-AP

Micro Commercial CoIn Stock: 10041P4KE350A-AP Datasheet

MFR RecommendedRFQ

P4KE350A-BP

Micro Commercial CoIn Stock: 701P4KE350A-BP Datasheet

MFR RecommendedRFQ

P4KE350A-TP

Micro Commercial CoIn Stock: 1042P4KE350A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE350 are categorized based on the following critical electrical and mechanical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 300V
• Unidirectional Channels: 1
• Mounting Type: Through Hole
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Package compatibility: DO-204AL (DO-41) or equivalent axial through-hole form factors

Secondary Compatibility Parameters:

• Voltage - Breakdown (Min): 315V minimum
• Voltage - Clamping (Max) @ Ipp: Within acceptable circuit protection range
• Current - Peak Pulse (10/1000µs): 850mA or higher
• Power - Peak Pulse: 400W or higher
• RoHS3 Compliance and MSL rating

Substitutes are grouped into two categories: direct pin-compatible replacements (P4KE350A variants) and functionally equivalent alternatives with different power ratings or package sizes (1.5KE series and P6KE series).

Parameter Comparison

Engineering Selection Recommendations

Direct Pin-Compatible Substitutes (Preferred for Drop-In Replacement):

The P4KE350A series (P4KE350A, P4KE350A-AP, P4KE350A-BP, P4KE350A-TP) manufactured by Taiwan Semiconductor Corporation and Micro Commercial Co represent the closest electrical and mechanical equivalents. These parts maintain identical reverse standoff voltage (300V), equivalent clamping voltage (482V), matching peak pulse current (850mA–870mA), and identical power rating (400W). All variants use the DO-204AL (DO-41) axial through-hole package and operate across the same temperature range (-55°C ~ 175°C). The primary difference among P4KE350A variants is packaging format: Tape & Reel (TR), Tape & Box (TB), and Bulk. All P4KE350A variants are currently in active production status, ensuring long-term availability. ROHS3 compliance is confirmed for P4KE350A and P4KE350A-TP.

Higher Power Alternatives (For Enhanced Protection Requirements):

The 1.5KE350A and 1.5KE300A series offer increased power dissipation (1500W) and higher peak pulse current (3.2A–3.6A), suitable for applications requiring greater transient energy absorption. The 1.5KE350A maintains the 300V reverse standoff voltage and 482V clamping voltage of the original P4KE350, while the 1.5KE300A operates at 256V standoff with 414V clamping. These parts use larger through-hole packages (DO-201AA, DO-27, or DO-201AE) and require PCB layout modifications. Both are ROHS3 compliant and in active production.

Intermediate Power Alternative:

The P6KE350A (Fairchild Semiconductor) provides 600W power rating and 1.3A peak pulse current in a DO-204AC (DO-15) through-hole package. This part maintains 300V reverse standoff and 482V clamping voltage, offering a middle ground between the 400W P4KE350 and 1500W 1.5KE series. Operating temperature range is -50°C ~ 175°C (slightly reduced low-temperature limit). The DO-15 package is mechanically compatible with DO-41 footprints in most applications.

Selection Criteria Summary:

• For direct replacement without PCB modification: Select P4KE350A variants (Taiwan Semiconductor or Micro Commercial Co)
• For enhanced transient protection: Select 1.5KE350A or 1.5KE300A (requires package footprint verification)
• For intermediate power requirements: Select P6KE350A (verify DO-15 package compatibility)
• Verify RoHS3 compliance requirements for your application before final selection

Frequently Asked Questions (FAQ)

Q: Can I use P4KE350A as a direct replacement for P4KE350?

A: Yes. The P4KE350A maintains identical electrical specifications (300V standoff, 482V clamping, 850mA peak pulse, 400W power) and uses the same DO-204AL (DO-41) through-hole axial package. No PCB modifications are required. The primary difference is that P4KE350 is obsolete while P4KE350A variants are in active production.

Q: What is the difference between P4KE350A, P4KE350A-AP, P4KE350A-BP, and P4KE350A-TP?

A: These variants are electrically identical but differ in packaging format. P4KE350A-TP is supplied in Tape & Reel (TR) format for automated assembly. P4KE350A-AP uses Tape & Box (TB) packaging. P4KE350A-BP is supplied in Bulk format. P4KE350A without suffix designation indicates the base part number. Select based on your procurement and assembly requirements.

Q: Can I use 1.5KE350A instead of P4KE350?

A: Electrically, the 1.5KE350A is compatible (300V standoff, 482V clamping). However, it uses a larger DO-201AA or DO-27 through-hole package instead of the DO-41 package. PCB layout modifications are required. The 1.5KE350A offers higher power dissipation (1500W vs. 400W), which may be beneficial for high-energy transient environments but is not necessary for applications designed for the original P4KE350.

Q: What is the difference between 1.5KE350A and 1.5KE300A?

A: The 1.5KE350A operates at 300V reverse standoff with 482V clamping voltage. The 1.5KE300A operates at 256V reverse standoff with 414V clamping voltage. Select 1.5KE350A for 300V protection circuits and 1.5KE300A for lower voltage applications. Both offer 1500W power dissipation and 3.2A–3.6A peak pulse current.

Q: Is P6KE350A compatible with P4KE350?

A: The P6KE350A is electrically compatible (300V standoff, 482V clamping, 482V clamping voltage) but uses a DO-204AC (DO-15) through-hole package instead of DO-41. The DO-15 package is mechanically similar to DO-41 and compatible with most PCB footprints. The P6KE350A offers 600W power rating (vs. 400W for P4KE350) and 1.3A peak pulse current. Verify package footprint compatibility before selection.

Q: Are all substitute parts RoHS3 compliant?

A: RoHS3 compliance is confirmed for P4KE350A, P4KE350A-TP, 1.5KE350A, 1.5KE300A, and the original P4KE350. RoHS status is not specified for P4KE350A-AP, P4KE350A-BP, and P6KE350A in the provided data. Verify RoHS3 compliance with your supplier if this certification is required for your application.

Q: What is the operating temperature range for these TVS diodes?

A: All substitute parts operate across -55°C ~ 175°C (TJ) except P6KE350A, which operates across -50°C ~ 175°C. The reduced low-temperature limit of P6KE350A (-50°C vs. -55°C) may be a consideration for applications requiring full -55°C operation.

Q: Can I mix different substitute parts in the same circuit?

A: Yes, provided they meet the electrical requirements of your circuit. All listed substitutes maintain 300V reverse standoff voltage and are suitable for general-purpose overvoltage protection. However, for consistency and simplified inventory management, select a single part number for production designs.