P4KE36A-B Equivalent & Substitute Parts

Part Overview

The P4KE36A-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 30.8V reverse standoff voltage with a 49.9V maximum clamping voltage and 8.2A peak pulse current rating. The part is supplied in bulk packaging with DO-204AL (DO-41) axial through-hole mounting and maintains active product status with full RoHS3 compliance.

Equivalent and substitute parts are identified based on matching or compatible electrical characteristics including reverse standoff voltage, clamping voltage, peak pulse current, power dissipation capability, and mechanical package compatibility. Alternative sources and higher-rated variants are available to support design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30.8	V
Voltage - Breakdown (Min)	34.2	V
Voltage - Clamping (Max) @ Ipp	49.9	V
Current - Peak Pulse (10/1000µs)	8.2	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts are grouped into three categories based on electrical and mechanical compatibility with the P4KE36A-B:

Category 1: Direct Electrical Equivalents (Same Package Family) Parts matching the 30.8V reverse standoff voltage and 49.9V clamping voltage with identical or compatible DO-204AL/DO-41 packaging. The P4KE36A from Taiwan Semiconductor Corporation qualifies as a direct equivalent with matching electrical specifications and packaging, differing only in manufacturer and packaging format (Tape & Reel versus Bulk).

Category 2: Higher Power Rating Alternatives (Upgraded Performance) Parts with identical voltage ratings (30.8V standoff, 49.9V clamping) but higher peak pulse current and power dissipation in larger packages (DO-201 or DO-15). The 1.5KE36A provides 31A peak pulse current and 1500W power rating in DO-201 package, and the P6KE36A provides 12.6A peak pulse current and 600W power rating in DO-15 package. These support applications requiring greater transient energy absorption.

Category 3: Voltage-Shifted Alternatives Parts with different voltage ratings but compatible package families. The 1.5KE39A (33.3V standoff, 53.9V clamping) and 1.5KE43A (36.8V standoff, 59.3V clamping) in DO-201 package, and P6KE43A (36.8V standoff, 59.3V clamping) in DO-15 package, serve applications requiring higher voltage protection thresholds. The SA33A (33V standoff, 53.3V clamping) in DO-15 package is obsolete but remains available in inventory.

Key Substitution Parameters:

Reverse Standoff Voltage (Typ): 30.8V to 36.8V range
Clamping Voltage (Max) @ Ipp: 49.9V to 59.3V range
Peak Pulse Current: 8.2A to 31A
Power Dissipation: 400W to 1500W
Mounting: Through Hole (Axial)
Temperature Range: -55°C to 175°C (TJ)

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamping Voltage (V)	Peak Pulse Current (A)	Power Rating (W)	Package	Status
P4KE36A-B	Littelfuse Inc.	30.8	34.2	49.9	8.2	400	DO-204AL (DO-41)	Active
P4KE36A	Taiwan Semiconductor Corporation	30.8	34.2	49.9	8.4	400	DO-204AL (DO-41)	Active
1.5KE36A	Taiwan Semiconductor Corporation	30.8	34.2	49.9	31	1500	DO-201AA (DO-27)	Active
P6KE36A	Fairchild Semiconductor	30.8	34.2	49.9	12.6	600	DO-204AC (DO-15)	Active
1.5KE39A	Taiwan Semiconductor Corporation	33.3	37.1	53.9	29	1500	DO-201AA (DO-27)	Active
1.5KE43A	Taiwan Semiconductor Corporation	36.8	40.9	59.3	26	1500	DO-201AA (DO-27)	Active
P6KE43A	Diotec Semiconductor	36.8	40.9	59.3	10.6	600	DO-204AC (DO-15)	Active
SA33A	Fairchild Semiconductor	33	36.7	53.3	9.4	500	DO-204AC (DO-15)	Obsolete

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): The P4KE36A from Taiwan Semiconductor Corporation is the primary equivalent, offering matching 30.8V standoff and 49.9V clamping specifications with identical 400W power rating. Both parts maintain active product status and RoHS3 compliance. Selection between Littelfuse and Taiwan Semiconductor variants depends on procurement source, packaging format preference (Bulk versus Tape & Reel), and inventory availability.

For Higher Energy Absorption Applications: The 1.5KE36A provides a 3.8x increase in power dissipation (1500W versus 400W) while maintaining identical voltage characteristics. This part is suitable for applications requiring greater transient energy handling. The DO-201 package accommodates the higher current rating (31A versus 8.2A). All 1.5KE series parts maintain active status and RoHS3 compliance.

For Intermediate Power Requirements: The P6KE36A offers 600W power rating and 12.6A peak pulse current in the DO-15 package, providing a middle ground between standard and high-power variants. This part is active and suitable for moderate transient protection requirements.

For Higher Voltage Protection Thresholds: When circuit protection requires higher clamping voltages, the 1.5KE39A (53.9V clamping) and 1.5KE43A (59.3V clamping) provide voltage-shifted protection with significantly higher power ratings. The P6KE43A offers the same 59.3V clamping in a smaller DO-15 package with 600W rating. All alternatives maintain active product status and RoHS3 compliance.

Obsolete Part Consideration: The SA33A is marked obsolete but remains in inventory (21,250 pcs). Use is not recommended for new designs; active alternatives should be prioritized.

Frequently Asked Questions (FAQ)

Q: Can the P4KE36A-B be directly replaced with the P4KE36A? A: Yes. Both parts share identical electrical specifications (30.8V standoff, 49.9V clamping, 8.2A/8.4A peak pulse current, 400W power rating) and the same DO-204AL (DO-41) package. The primary difference is manufacturer (Littelfuse versus Taiwan Semiconductor) and packaging format (Bulk versus Tape & Reel). Both are active products with RoHS3 compliance.

Q: What is the difference between DO-204AL and DO-15 packages? A: DO-204AL (also designated DO-41) is a smaller axial package used in the P4KE series. DO-15 (also designated DO-204AC) is a larger axial package used in the P6KE series. Both are through-hole axial components, but DO-15 accommodates higher current ratings and power dissipation. Package selection depends on PCB layout constraints and thermal management requirements.

Q: Can I use the 1.5KE36A as a substitute for the P4KE36A-B? A: Electrical substitution is possible because both parts maintain identical voltage ratings (30.8V standoff, 49.9V clamping). However, the 1.5KE36A uses the larger DO-201 package and carries significantly higher peak pulse current (31A versus 8.2A) and power rating (1500W versus 400W). PCB layout modifications are required to accommodate the different package. Use this substitute only if the application requires higher transient energy absorption or if the larger package is acceptable.

Q: What does "Reverse Standoff Voltage" mean in TVS diode selection? A: Reverse Standoff Voltage (Vwm) is the maximum voltage the TVS diode can withstand in its normal operating state without conducting. For the P4KE36A-B, this is 30.8V. When transient voltage exceeds the Breakdown Voltage (34.2V minimum), the diode conducts and clamps the voltage to the Clamping Voltage (49.9V maximum). Substitute parts must maintain compatible standoff and clamping voltages for the protected circuit.

Q: Are all substitute parts RoHS3 compliant? A: All active substitute parts listed (P4KE36A, 1.5KE36A, 1.5KE39A, 1.5KE43A, P6KE36A, P6KE43A) are RoHS3 compliant. The SA33A is also RoHS3 compliant but is marked obsolete. Compliance status is provided in the specification data for each part.

Q: What is the temperature operating range for these TVS diodes? A: The P4KE36A-B and all active substitute parts operate across -55°C to 175°C (junction temperature). This range supports industrial and automotive applications. The SA33A does not specify an operating temperature range in the provided data.

Q: Can voltage-shifted alternatives like the 1.5KE39A be used interchangeably with the P4KE36A-B? A: No. The 1.5KE39A has a higher standoff voltage (33.3V versus 30.8V) and higher clamping voltage (53.9V versus 49.9V). This part is suitable only for circuits designed to operate at the higher voltage threshold. Using a higher-voltage TVS in a circuit designed for 30.8V standoff will not provide adequate protection at the intended voltage level.

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