P4KE43C Equivalent & Substitute Parts

Part Overview

The P4KE43C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component operates with a reverse standoff voltage of 36.8V and provides peak pulse power handling of 400W. The P4KE43C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the same electrical performance envelope while offering active product status from alternative manufacturers.

Substiute Parts

P4KE43C

Littelfuse Inc.In Stock: 1117P4KE43C Datasheet

Current PartRFQ

P4KE43CA

Taiwan Semiconductor CorporationIn Stock: 860P4KE43CA Datasheet

DirectRFQ

P4KE43CA-AP

Micro Commercial CoIn Stock: 1064P4KE43CA-AP Datasheet

MFR RecommendedRFQ

P4KE43CA-BP

Micro Commercial CoIn Stock: 796P4KE43CA-BP Datasheet

MFR RecommendedRFQ

P4KE43CA-G

Comchip TechnologyIn Stock: 1178P4KE43CA-G Datasheet

MFR RecommendedRFQ

P4KE43CA-TP

Micro Commercial CoIn Stock: 835P4KE43CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE43C is determined by the following critical parameters:

• Reverse standoff voltage: 36.8V (Typ)
• Breakdown voltage minimum: 38.75V or higher
• Clamping voltage maximum @ Ipp: 62.27V or lower
• Peak pulse current: 6.9A minimum
• Peak pulse power: 400W
• Operating temperature range: -55°C to 175°C minimum
• Package compatibility: DO-204AL / DO-41 through-hole axial configuration
• Bidirectional channels: 1
• Type: Zener diode

All substitute parts listed maintain these electrical and mechanical parameters within acceptable tolerances for direct circuit substitution. Voltage clamping characteristics and current handling capacity are preserved across all approved substitutes.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are classified as active products, ensuring long-term availability and supply chain continuity compared to the obsolete P4KE43C. Selection among substitutes should be based on the following criteria:

P4KE43CA (Taiwan Semiconductor Corporation): Direct manufacturer equivalent with active status. Offers 7A peak pulse current, exceeding the original 6.9A specification. ROHS3 compliance status not explicitly stated in available documentation.

P4KE43CA-AP, P4KE43CA-BP, P4KE43CA-TP (Micro Commercial Co): All three variants maintain identical electrical specifications with 6.9A peak pulse current matching the original design. REACH compliance confirmed. Operating temperature range extends to 175°C. Packaging available in bulk configuration.

P4KE43CA-G (Comchip Technology): Maintains core electrical parameters with 6.75A peak pulse current. Operating temperature range limited to 150°C maximum, which is 25°C lower than the original specification. ROHS3 compliant. Suitable for applications not requiring the full 175°C upper temperature limit.

All substitute parts maintain the 36.8V reverse standoff voltage, 400W peak pulse power rating, and DO-204AL / DO-41 through-hole package compatibility required for direct circuit substitution.

Frequently Asked Questions (FAQ)

Q: Can P4KE43CA substitute directly for P4KE43C in existing designs?

A: Yes. P4KE43CA maintains identical reverse standoff voltage (36.8V), peak pulse power (400W), and package configuration (DO-204AL / DO-41). The clamping voltage is lower (59.3V vs 62.27V), providing improved transient suppression. Peak pulse current is higher (7A vs 6.9A), offering additional margin.

Q: What is the difference between P4KE43CA-AP, P4KE43CA-BP, and P4KE43CA-TP?

A: These three Micro Commercial Co variants are electrically identical, all rated at 36.8V reverse standoff, 59.3V clamping voltage, and 6.9A peak pulse current. Differences are limited to packaging and distribution channels. All maintain -55°C to 175°C operating temperature range.

Q: Why does P4KE43CA-G have a lower maximum operating temperature?

A: P4KE43CA-G from Comchip Technology is rated to 150°C maximum junction temperature, compared to 175°C for other substitutes. This 25°C reduction does not affect electrical performance at rated conditions. Applications operating below 150°C junction temperature experience no functional difference.

Q: Are all substitute parts ROHS3 compliant?

A: ROHS3 compliance is explicitly confirmed for P4KE43C (original) and P4KE43CA-G. Compliance status for P4KE43CA, P4KE43CA-AP, P4KE43CA-BP, and P4KE43CA-TP is not specified in available technical documentation. Verify with suppliers if ROHS3 certification is required for your application.

Q: Can I use P4KE43CA-G in high-temperature applications?

A: P4KE43CA-G is suitable for applications with maximum junction temperatures up to 150°C. For designs requiring operation to 175°C, select P4KE43CA, P4KE43CA-AP, P4KE43CA-BP, or P4KE43CA-TP instead.

Q: Are the DO-204AL and DO-41 packages interchangeable?

A: Yes. DO-204AL and DO-41 refer to the same through-hole axial package configuration. All listed parts use this identical package, ensuring mechanical and electrical compatibility in PCB layouts designed for the original P4KE43C.

Q: What is the inventory status for these substitute parts?

A: P4KE43CA: 753 units. P4KE43CA-AP: 1015 units. P4KE43CA-BP: 733 units. P4KE43CA-G: 1105 units. P4KE43CA-TP: 802 units. All substitutes are available as new original stock.