P4KE36 Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The P4KE36 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 30.8V reverse standoff voltage with 52.4V maximum clamping voltage and 400W peak pulse power rating in a DO-204AL (DO-41) through-hole axial package.

The P4KE36 is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with comparable or enhanced electrical characteristics, offering active product status and improved availability for new designs and production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30.8	V
Voltage - Breakdown (Min)	32.4	V
Voltage - Clamping (Max) @ Ipp	52.4	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

Substitution of the P4KE36 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 30.8V nominal
Voltage - Clamping (Max) @ Ipp: Must not exceed 52.4V to 59.3V range
Current - Peak Pulse (10/1000µs): Minimum 8.2A
Power - Peak Pulse: Minimum 400W
Unidirectional operation with single channel configuration
Operating temperature range: -55°C to 175°C

Mechanical Compatibility Criteria:

Through-hole axial mounting
Package options: DO-204AL (DO-41), DO-204AC (DO-15), or DO-201 (DO-27)
Zener diode type

Substitute parts are grouped into two categories based on package type and power rating:

Category 1 - Direct Package Match (DO-204AL/DO-41): Parts maintaining the original DO-41 package footprint with 400W power rating.

Category 2 - Enhanced Performance (DO-201/DO-27): Parts with higher power ratings (1500W) and increased current handling, suitable for applications requiring greater transient energy dissipation.

Category 3 - Intermediate Performance (DO-204AC/DO-15): Parts with 600W power rating in DO-15 package, offering a middle ground between standard and high-power options.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status
P4KE36	Littelfuse Inc.	30.8	52.4	8.2	400	DO-204AL (DO-41)	Obsolete
P4KE36A	Taiwan Semiconductor Corporation	30.8	49.9	8.4	400	DO-204AL (DO-41)	Active
P4KE36A-AP	Micro Commercial Co	30.8	49.9	8.2	400	DO-204AL (DO-41)	Active
P4KE36A-BP	Micro Commercial Co	30.8	49.9	8.2	400	DO-204AL (DO-41)	Active
P6KE36A	Fairchild Semiconductor	30.8	49.9	12.6	600	DO-204AC (DO-15)	Active
1.5KE36A	Taiwan Semiconductor Corporation	30.8	49.9	31	1500	DO-201 (DO-27)	Active
1.5KE39A	Taiwan Semiconductor Corporation	33.3	53.9	29	1500	DO-201 (DO-27)	Active
1.5KE43A	Taiwan Semiconductor Corporation	36.8	59.3	26	1500	DO-201 (DO-27)	Active
P6KE43A	Diotec Semiconductor	36.8	59.3	10.6	600	DO-204AC (DO-15)	Active
SA33A	Fairchild Semiconductor	33	53.3	9.4	500	DO-204AC (DO-15)	Obsolete

Engineering Selection Recommendations

Direct Replacement (Same Package, Same Power Rating):

P4KE36A, P4KE36A-AP, and P4KE36A-BP are direct functional equivalents with active product status. All three maintain the DO-204AL (DO-41) package and 400W power rating. P4KE36A from Taiwan Semiconductor Corporation offers the highest inventory availability (30,300 pcs). P4KE36A-AP and P4KE36A-BP from Micro Commercial Co provide alternative sourcing with lower inventory levels (728 and 831 pcs respectively). All three are ROHS3 compliant and suitable for direct substitution in existing designs.

Enhanced Performance Substitutes (Higher Power Rating):

P6KE36A (Fairchild Semiconductor, 600W, DO-15) and 1.5KE36A (Taiwan Semiconductor Corporation, 1500W, DO-201) provide increased power dissipation capability while maintaining the 30.8V reverse standoff voltage. These options require PCB layout modifications due to different package footprints but offer superior transient energy handling. Both are active products with ROHS3 compliance.

Higher Voltage Alternatives:

1.5KE39A and 1.5KE43A offer elevated voltage ratings (33.3V and 36.8V standoff respectively) with 1500W power ratings in DO-201 packages. These are suitable only when circuit design permits higher clamping voltages. P6KE43A provides a 600W intermediate option with 36.8V standoff in DO-15 package.

Compliance and Availability:

All recommended active substitutes are ROHS3 compliant and rated for -55°C to 175°C operating temperature. Inventory availability varies significantly; Taiwan Semiconductor Corporation parts demonstrate the highest stock levels across multiple voltage ratings.

Frequently Asked Questions (FAQ)

Q: Can P4KE36A directly replace P4KE36 without PCB modifications?

A: Yes. P4KE36A maintains identical package (DO-204AL/DO-41), power rating (400W), and reverse standoff voltage (30.8V). No PCB layout changes are required. The clamping voltage is slightly lower (49.9V vs 52.4V), which provides improved protection margins.

Q: What is the difference between P4KE36A and P6KE36A?

A: P4KE36A uses DO-41 package with 400W rating; P6KE36A uses DO-15 package with 600W rating. Both maintain 30.8V standoff voltage and 49.9V clamping voltage. P6KE36A requires different PCB footprint but offers higher transient energy dissipation capability.

Q: Are 1.5KE series parts compatible with P4KE36 applications?

A: 1.5KE36A is electrically compatible with identical 30.8V standoff and 49.9V clamping voltages, but requires DO-201 package footprint. The 1500W power rating provides significantly higher transient protection. 1.5KE39A and 1.5KE43A have higher voltage ratings and are compatible only if circuit design permits elevated clamping voltages.

Q: What does "obsolete" product status mean for P4KE36?

A: Obsolete status indicates the part is no longer manufactured by Littelfuse Inc. Active equivalent parts from other manufacturers are available with comparable or superior specifications. Existing inventory may be limited and sourcing from secondary markets may incur premium pricing.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended active substitutes (P4KE36A, P4KE36A-AP, P4KE36A-BP, P6KE36A, 1.5KE36A, 1.5KE39A, 1.5KE43A, P6KE43A) are ROHS3 compliant. SA33A is also ROHS3 compliant but is obsolete.

Q: Which substitute offers the best inventory availability?

A: P4KE36A from Taiwan Semiconductor Corporation has the highest inventory level at 30,300 pcs. 1.5KE39A follows with 42,000 pcs and 1.5KE43A with 36,729 pcs. These high-volume options provide reliable sourcing for production requirements.

Q: Can I use a higher voltage rated part like 1.5KE43A as a substitute?

A: 1.5KE43A has a 36.8V standoff voltage versus P4KE36's 30.8V. This higher voltage rating means the device will not clamp transients until higher voltage levels are reached. Use only if circuit design specifically permits this higher protection threshold.

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