P4KE47C Equivalent & Substitute Parts

Part Overview

The P4KE47C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This bidirectional Zener diode operates at a reverse standoff voltage of 40.2V with a peak pulse power rating of 400W and is housed in a DO-204AL (DO-41) axial package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	40.2V
Voltage - Breakdown (Min)	42.35V
Voltage - Clamping (Max) @ Ipp	68.04V
Current - Peak Pulse (10/1000µs)	6.3A
Power - Peak Pulse	400W
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the P4KE47C are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Voltage - Reverse Standoff (Typ): 40.2V
Voltage - Clamping (Max) @ Ipp: 64.8V to 68.04V range
Current - Peak Pulse: 6.2A to 6.4A
Power - Peak Pulse: 400W minimum
Package / Case: DO-204AL (DO-41) or DO-204AC (DO-15) axial through-hole
Operating Temperature: -55°C to 175°C minimum
Type: Zener, Bidirectional, single channel

Parts meeting these criteria are classified as direct substitutes. Parts with higher peak pulse current (9.7A) or different package types (DO-15) are listed as functional alternatives with noted differences. Parts with higher reverse standoff voltages (47.8V) fall outside the substitution range and are not recommended for direct replacement.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
P4KE47C	Littelfuse Inc.	40.2V	68.04V	6.3A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Obsolete
P4KE47CA	Taiwan Semiconductor Corporation	40.2V	64.8V	6.4A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
P6KE47CA	Diotec Semiconductor	40.2V	64.8V	9.7A	600W	DO-204AC (DO-15)	-50°C ~ 175°C	Active
BZW04-40BHE3/54	Vishay General Semiconductor - Diodes Division	40.2V	64.8V	6.2A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
BZW04-40BHE3/73	Vishay General Semiconductor - Diodes Division	40.2V	64.8V	6.2A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
P4KE47CA-AP	Micro Commercial Co	40.2V	64.8V	6.3A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
P4KE47CA-BP	Micro Commercial Co	40.2V	64.8V	6.3A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
P4KE47CA-G	Comchip Technology	40.2V	64.8V	6.17A	400W	DO-204AL (DO-41)	-55°C ~ 150°C	Active
P4KE47CA-TP	Micro Commercial Co	40.2V	64.8V	6.3A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
P4KE47CAHE3/54	Vishay General Semiconductor - Diodes Division	40.2V	64.8V	6.2A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active

Engineering Selection Recommendations

Direct Substitutes (Preferred)

P4KE47CA, P4KE47CA-AP, P4KE47CA-BP, and P4KE47CA-TP from Micro Commercial Co and Taiwan Semiconductor Corporation are direct substitutes. These parts maintain identical reverse standoff voltage (40.2V), clamping voltage (64.8V), peak pulse current (6.3A to 6.4A), and power rating (400W) with matching DO-204AL (DO-41) packaging and operating temperature range (-55°C to 175°C). All are ROHS3 compliant and active products.

Automotive-Grade Alternatives

BZW04-40BHE3/54 and BZW04-40BHE3/73 from Vishay General Semiconductor (TransZorb® series) are functionally equivalent with AEC-Q101 automotive qualification. These parts meet all electrical parameters with 6.2A peak pulse current and include automotive-grade certification. Both are active products with full compliance documentation.

P4KE47CAHE3/54 from Vishay General Semiconductor offers automotive-grade performance with identical electrical specifications and AEC-Q101 qualification in DO-204AL (DO-41) packaging.

Higher Power Alternative

P6KE47CA from Diotec Semiconductor provides enhanced performance with 9.7A peak pulse current and 600W power rating in DO-204AC (DO-15) packaging. This part is suitable for applications requiring higher transient energy absorption. Operating temperature range is -50°C to 175°C, which is acceptable for most applications but does not extend to -55°C.

Temperature-Limited Alternative

P4KE47CA-G from Comchip Technology operates at -55°C to 150°C maximum junction temperature, which is 25°C lower than the original specification. This part is suitable only for applications where the upper operating temperature does not exceed 150°C.

Not Recommended

BZW04-48B has a reverse standoff voltage of 47.8V, which exceeds the 40.2V specification and is outside the substitution range.

Frequently Asked Questions (FAQ)

Q: Can I use P6KE47CA as a direct replacement for P4KE47C?

A: P6KE47CA is functionally compatible but not a direct replacement. It maintains the same reverse standoff voltage (40.2V) and clamping voltage (64.8V) but uses DO-204AC (DO-15) packaging instead of DO-204AL (DO-41). The larger package may require PCB layout modifications. Additionally, the minimum operating temperature is -50°C instead of -55°C. Use this part only if your application does not require -55°C operation and if the larger package fits your design.

Q: What is the difference between P4KE47CA variants (AP, BP, TP)?

A: P4KE47CA-AP, P4KE47CA-BP, and P4KE47CA-TP are all manufactured by Micro Commercial Co with identical electrical specifications. The suffix designates different packaging or tape configurations (Bulk packaging). All three are electrically interchangeable for the P4KE47C application.

Q: Are Vishay BZW04-40BHE3 parts suitable for automotive applications?

A: Yes. BZW04-40BHE3/54 and BZW04-40BHE3/73 carry AEC-Q101 automotive qualification and are graded for automotive use. These parts are suitable for automotive and industrial applications requiring certified components.

Q: Why does P4KE47CA-G have a lower maximum operating temperature?

A: P4KE47CA-G from Comchip Technology is rated to -55°C to 150°C (TJ), which is 25°C lower than the original P4KE47C specification of -55°C to 175°C. This part is suitable only for applications where the junction temperature does not exceed 150°C. Verify your thermal design before selecting this alternative.

Q: Can I use BZW04-48B as a substitute?

A: No. BZW04-48B has a reverse standoff voltage of 47.8V, which is outside the 40.2V specification of the P4KE47C. This part is not electrically compatible and will not provide equivalent protection.

Q: What packaging considerations apply to these substitutes?

A: All recommended substitutes except P6KE47CA use DO-204AL (DO-41) axial through-hole packaging, which is mechanically identical to the original P4KE47C. P6KE47CA uses DO-204AC (DO-15) packaging, which is physically larger and may require PCB layout changes. Verify package dimensions against your PCB footprint before ordering.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes are ROHS3 compliant. Compliance documentation is available from each manufacturer upon request.

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