P4KE56A-B Equivalent & Substitute Parts

Part Overview

The P4KE56A-B is an active-status Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional zener diode operates with a reverse standoff voltage of 47.8V and provides clamping at 77V maximum, making it suitable for circuit protection in industrial and commercial electronics. The through-hole DO-204AL (DO-41) axial package enables direct PCB integration. Equivalent and substitute parts are identified based on matching electrical performance parameters and compatible package specifications to support procurement flexibility and supply chain continuity.

Substiute Parts

P4KE56A-B

Littelfuse Inc.In Stock: 1138P4KE56A-B Datasheet

Current PartRFQ

P4KE56A

Taiwan Semiconductor CorporationIn Stock: 3501P4KE56A Datasheet

MFR RecommendedRFQ

SAC45

Littelfuse Inc.In Stock: 4625SAC45 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE56A-B are identified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): Determines the safe operating voltage threshold. Substitutes must maintain equivalent or compatible standoff voltage to ensure proper circuit protection.
• Voltage - Clamping (Max) @ Ipp: Defines the maximum transient voltage suppression level. This parameter must remain consistent across substitutes.
• Current - Peak Pulse (10/1000µs): Specifies the peak current handling capability during transient events. Substitutes with equal or higher ratings are acceptable.
• Power - Peak Pulse: Indicates the maximum dissipation capacity. Substitutes must meet or exceed this specification.
• Package / Case and Mounting Type: Physical compatibility with PCB layout and assembly processes. Through-hole axial packages (DO-204AL, DO-204AC) are interchangeable in footprint-compatible applications.
• Operating Temperature Range: Must support the same thermal operating window.
• Compliance Status (RoHS, REACH): Regulatory alignment for end-use applications.

Parameter Comparison

Engineering Selection Recommendations

P4KE56A (Taiwan Semiconductor Corporation) is the primary equivalent substitute. This part maintains identical electrical specifications (47.8V standoff, 77V clamping, 53.2V breakdown minimum) and operates within the same temperature range. The peak pulse current is marginally higher at 5.4A versus 5.3A, providing equivalent or superior transient suppression. Both parts use the DO-204AL (DO-41) package, ensuring direct mechanical and electrical compatibility. Both are ROHS3 compliant and active-status products, supporting long-term supply availability.

SAC45 (Littelfuse Inc.) is an alternative substitute with design trade-offs. This part operates at a lower reverse standoff voltage (45V) and breakdown minimum (50V), making it suitable only for applications where the lower voltage threshold is acceptable. The SAC45 offers higher peak pulse current (6.8A) and power dissipation (500W), beneficial for high-energy transient environments. The DO-204AC (DO-15) package differs from the DO-204AL, requiring PCB footprint verification before substitution. SAC45 is ROHS3 compliant and active-status.

Selection between P4KE56A and SAC45 depends on circuit voltage requirements and available PCB footprint compatibility. For direct replacement without design modification, P4KE56A is the preferred choice.

Frequently Asked Questions (FAQ)

Q: Can P4KE56A (Taiwan Semiconductor) be used as a direct replacement for P4KE56A-B (Littelfuse)?

A: Yes. Both parts share identical reverse standoff voltage (47.8V), breakdown voltage (53.2V), and clamping voltage (77V). The peak pulse current specification of P4KE56A is 5.4A compared to 5.3A in P4KE56A-B, representing equivalent or superior performance. Both use DO-204AL (DO-41) packages and operate across -55 to 175°C. Both are ROHS3 compliant and active-status products.

Q: Is SAC45 a suitable substitute for P4KE56A-B?

A: SAC45 is a conditional substitute. It maintains the same 77V clamping voltage and operating temperature range, but operates at a lower reverse standoff voltage (45V vs. 47.8V) and breakdown minimum (50V vs. 53.2V). SAC45 is appropriate only if the circuit design tolerates lower voltage thresholds. The DO-204AC (DO-15) package differs from DO-204AL (DO-41), requiring PCB footprint compatibility verification. SAC45 offers higher current (6.8A) and power (500W) ratings, beneficial for high-energy transient protection.

Q: What are the key electrical parameters that determine substitutability?

A: The critical parameters are reverse standoff voltage, breakdown voltage minimum, clamping voltage maximum, peak pulse current, and power dissipation. Substitutes must maintain the same or compatible clamping voltage (77V in this case). Standoff and breakdown voltages should match or be higher to preserve circuit protection thresholds. Peak pulse current and power ratings should equal or exceed the original specification.

Q: Are packaging differences between DO-204AL and DO-204AC significant?

A: Yes. DO-204AL (DO-41) and DO-204AC (DO-15) are distinct axial through-hole packages with different physical dimensions and lead spacing. PCB footprints are not interchangeable without layout modification. Verify footprint compatibility before selecting SAC45 as a substitute for P4KE56A-B.

Q: What compliance certifications apply to these parts?

A: All three parts (P4KE56A-B, P4KE56A, and SAC45) are ROHS3 compliant and REACH unaffected, supporting use in regulated industrial and commercial applications. Moisture sensitivity level is 1 (unlimited) for all parts, indicating no special storage or handling requirements.