P4KE36C Equivalent & Substitute Parts

Part Overview

The P4KE36C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional zener diode operates in the DO-204AL (DO-41) package with a 30.8V reverse standoff voltage and 400W peak pulse power rating. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	30.8V
Breakdown Voltage (Min)	32.4V
Clamping Voltage (Max) @ Ipp	52.4V
Peak Pulse Current (10/1000µs)	8.2A
Peak Pulse Power	400W
Package Type	DO-204AL (DO-41)
Operating Temperature Range	-55°C to 175°C
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the P4KE36C is determined by the following critical parameters:

Voltage Parameters: Reverse standoff voltage must remain at 30.8V (±tolerance) to maintain circuit protection thresholds. Clamping voltage and breakdown voltage must be compatible with the protected circuit's maximum allowable transient voltage.

Current and Power Rating: Peak pulse current and power dissipation capacity determine the part's ability to suppress transient events. Parts with equal or higher ratings are acceptable substitutes.

Package Compatibility: The DO-204AL (DO-41) axial package is the primary form factor. Substitutes in alternative packages (DO-15, DO-201) require PCB layout verification but remain electrically equivalent if voltage and current parameters align.

Thermal Performance: Operating temperature range must support the application environment. Parts rated to -55°C to 175°C are direct equivalents.

Compliance: RoHS3 compliance and REACH unaffected status ensure regulatory alignment.

Substitutes are grouped into three categories: direct equivalents (same voltage/power class in DO-41 package), higher-power alternatives (1500W class for enhanced protection margin), and alternative package options (DO-15, DO-201) for layout flexibility.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamp Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Status
P4KE36C	Littelfuse Inc.	30.8	32.4	52.4	8.2	400	DO-204AL (DO-41)	Obsolete
P4KE36CA	Taiwan Semiconductor	30.8	34.2	49.9	8.4	400	DO-204AL (DO-41)	Active
P4KE36CA-AP	Micro Commercial Co	30.8	34.2	49.9	8.2	400	DO-204AL (DO-41)	Active
P4KE36CA-BP	Micro Commercial Co	30.8	34.2	49.9	8.2	400	DO-204AL (DO-41)	Active
P4KE36CA-G	Comchip Technology	30.8	34.2	49.9	8.02	400	DO-204AL (DO-41)	Active
P6KE36CA	Taiwan Semiconductor	30.8	34.2	49.9	12	600	DO-204AC (DO-15)	Active
SA36CA	Taiwan Semiconductor	36	40	58.1	9	500	DO-204AC (DO-15)	Active
1.5KE36CA	Good-Ark Semiconductor	30.8	34.2	49.9	30.1	1500	DO-201AE	Active
1.5KE39CA	Taiwan Semiconductor	33.3	37.1	53.9	29	1500	DO-201AA (DO-27)	Active
1.5KE43CA	Taiwan Semiconductor	36.8	40.9	59.3	26	1500	DO-201AA (DO-27)	Active

Engineering Selection Recommendations

Direct Equivalents (Preferred for Drop-In Replacement):

P4KE36CA, P4KE36CA-AP, P4KE36CA-BP, and P4KE36CA-G are direct functional equivalents in the DO-41 package with matching 30.8V standoff voltage and 400W power rating. All are active products with ROHS3 compliance. P4KE36CA from Taiwan Semiconductor offers the highest inventory availability (100,200 pcs). These parts require no circuit redesign and maintain identical thermal and electrical performance.

Higher-Power Alternative (Enhanced Protection Margin):

1.5KE36CA (Good-Ark Semiconductor) maintains the 30.8V standoff voltage while providing 1500W peak pulse power and 30.1A peak pulse current. This part is suitable for applications requiring additional transient suppression margin. The DO-201AE package is larger and requires PCB layout modification.

Voltage-Shifted Alternatives (Circuit Verification Required):

1.5KE39CA and 1.5KE43CA offer higher standoff voltages (33.3V and 36.8V respectively) with 1500W power ratings. These parts are suitable only if the protected circuit can tolerate higher protection thresholds. SA36CA (500W, DO-15 package) operates at 36V standoff voltage and requires similar circuit verification.

Package Alternatives (Layout Dependent):

P6KE36CA (DO-15 package, 600W) maintains 30.8V standoff voltage with increased current capacity (12A). This option is viable if PCB space permits the smaller DO-15 form factor.

Frequently Asked Questions (FAQ)

Q: Can I use P4KE36CA as a direct replacement for P4KE36C?

A: Yes. P4KE36CA is a direct equivalent with identical reverse standoff voltage (30.8V), peak pulse power (400W), and DO-41 package. It is an active product from Taiwan Semiconductor with full ROHS3 compliance.

Q: What is the difference between P4KE36CA and 1.5KE36CA?

A: Both maintain 30.8V standoff voltage, but 1.5KE36CA provides 1500W peak pulse power versus 400W for P4KE36CA. The 1.5KE36CA uses a larger DO-201AE package. Select 1.5KE36CA only if your circuit requires higher transient energy absorption capacity.

Q: Can I substitute SA36CA for P4KE36C?

A: SA36CA has a higher standoff voltage (36V vs. 30.8V) and different package (DO-15). Substitution requires circuit verification to confirm the higher protection threshold is acceptable. The 500W power rating is also lower than the original 400W specification.

Q: Why do some substitutes have different clamping voltages?

A: Clamping voltage varies based on the peak pulse current at which it is measured. Parts with higher current ratings typically exhibit lower clamping voltages. Verify that the clamping voltage at the substitute part's rated current is acceptable for your protected circuit.

Q: Are all listed substitutes RoHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

Q: What is the impact of switching from DO-41 to DO-15 or DO-201 package?

A: Package changes require PCB layout modification for lead spacing and mounting hole positioning. Electrical performance remains equivalent if voltage and current parameters match. Verify thermal dissipation capability in the new package form factor.

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