SA43CA Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA43CA is an active Littelfuse TVS diode designed for transient voltage suppression applications. This through-hole component operates with a 43V reverse standoff voltage and provides 69.4V maximum clamping voltage with 7.3A peak pulse current capability. The device is ROHS3 compliant and rated for general-purpose protection circuits across industrial and commercial applications. Finding equivalent or substitute parts may be necessary due to inventory constraints, application-specific power requirements, or design optimization needs.

Substiute Parts

SA43CA

Littelfuse Inc.In Stock: 2829SA43CA Datasheet

Current PartRFQ

5KP43CA

Littelfuse Inc.In Stock: 43425KP43CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA43CA is determined by strict electrical and mechanical compatibility criteria. The primary substitute identified is the 5KP43CA, which maintains identical voltage specifications (43V reverse standoff, 47.8V breakdown minimum, 69.4V clamping maximum) and operating temperature range (-55°C to 175°C). Both devices are bidirectional single-channel Zener TVS diodes with through-hole mounting.

The key differentiator between SA43CA and 5KP43CA is power dissipation capacity: SA43CA is rated at 500W peak pulse power, while 5KP43CA is rated at 5000W (5kW) peak pulse power. This results in a corresponding increase in peak pulse current from 7.3A to 74.6A. Both devices maintain the same voltage clamping characteristics and are suitable for general-purpose applications.

Substitution eligibility is based on:

• Identical reverse standoff voltage (43V)
• Identical breakdown voltage minimum (47.8V)
• Identical clamping voltage maximum (69.4V)
• Compatible operating temperature range
• Through-hole axial package compatibility
• ROHS3 compliance and EAR99 classification

Parameter Comparison

Engineering Selection Recommendations

Both SA43CA and 5KP43CA are active products from Littelfuse Inc. with ROHS3 compliance and EAR99 export classification. Selection between these devices depends on application power requirements.

The SA43CA (500W peak pulse) is suitable for applications with lower transient energy levels and space constraints where the DO-204AC (DO-15) axial package is preferred. The 5KP43CA (5000W peak pulse) is appropriate for higher-energy transient suppression requirements and applications where the P600 package footprint is acceptable. Both devices maintain identical voltage protection characteristics and operating temperature specifications, ensuring functional equivalence within their respective power ratings.

Frequently Asked Questions (FAQ)

Q: Can 5KP43CA directly replace SA43CA in existing designs? A: Yes, from an electrical standpoint. Both devices provide identical voltage clamping (69.4V maximum) and reverse standoff (43V) characteristics. However, the package differs: SA43CA uses DO-204AC (DO-15) while 5KP43CA uses P600. Physical board layout compatibility must be verified before substitution.

Q: What is the primary difference between SA43CA and 5KP43CA? A: Power dissipation capacity. SA43CA is rated at 500W peak pulse power with 7.3A peak pulse current. 5KP43CA is rated at 5000W peak pulse power with 74.6A peak pulse current. Both maintain identical voltage specifications.

Q: Are both parts ROHS3 compliant? A: Yes. Both SA43CA and 5KP43CA are ROHS3 compliant with EAR99 export classification.

Q: What operating temperature range do these devices support? A: Both SA43CA and 5KP43CA operate across -55°C to 175°C junction temperature range.

Q: Which part should be selected for high-energy transient suppression? A: The 5KP43CA is rated for significantly higher peak pulse power (5000W versus 500W) and peak pulse current (74.6A versus 7.3A), making it suitable for applications requiring greater transient energy absorption.

Q: Are there package compatibility considerations? A: Yes. SA43CA uses DO-204AC (DO-15) axial package while 5KP43CA uses P600 axial package. Both are through-hole components, but physical dimensions and PCB footprints differ. Board layout verification is required before substitution.