PACDN043Y4R Equivalent & Substitute Parts

Part Overview

The PACDN043Y4R is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 5.5V reverse standoff voltage with an 8V maximum clamping voltage and operates across the -40°C to 85°C temperature range. The device is packaged in SOT-143-4 configuration with three unidirectional channels.

The PACDN043Y4R is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

PACDN043Y4R

onsemiIn Stock: 18117PACDN043Y4R Datasheet

Current PartRFQ

NSQA6V8AW5T2G

onsemiIn Stock: 86073NSQA6V8AW5T2G Datasheet

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SP0503BAHTG

LittelfuseIn Stock: 267818SP0503BAHTG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PACDN043Y4R are identified based on the following critical parameters that determine functional equivalence:

• Reverse Standoff Voltage: 5V to 5.5V range
• Clamping Voltage: Maximum 8V to 8.5V @ Ipp
• Unidirectional Channels: 3 channels
• Package Type: SOT-143-4 form factor
• Mounting Type: Surface Mount
• Operating Temperature Range: Minimum -40°C to 85°C coverage
• Product Status: Active or available inventory

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

SP0503BAHTG (Littelfuse) is the primary substitute for PACDN043Y4R. This part maintains identical package geometry (SOT-143-4), matching reverse standoff voltage (5.5V maximum), and equivalent clamping voltage (8.5V). The operating temperature range (-40°C to 85°C) aligns with the original specification. The part is currently in active production status with substantial inventory availability. RoHS3 compliance is confirmed.

NSQA6V8AW5T2G (onsemi) is a secondary substitute option. While manufactured by the same original equipment manufacturer, this part differs in package type (SC-88A/SOT-353 instead of SOT-143-4) and clamping voltage specification (13V versus 8V). The reverse standoff voltage (5V) falls within acceptable tolerance. This part offers an extended operating temperature range (-40°C to 125°C) and is actively produced. Selection of this part requires PCB layout modification to accommodate the different package footprint.

Frequently Asked Questions (FAQ)

Q: Can SP0503BAHTG directly replace PACDN043Y4R without PCB modifications?

A: Yes. SP0503BAHTG maintains identical SOT-143-4 package geometry and pinout compatibility. No PCB layout changes are required.

Q: Why does NSQA6V8AW5T2G have a higher clamping voltage (13V) than the original part (8V)?

A: NSQA6V8AW5T2G is packaged in SC-88A form factor with different electrical characteristics. While the reverse standoff voltage (5V) remains within specification, the higher clamping voltage represents a different protection profile. This part requires application-level verification to confirm suitability.

Q: What is the primary difference between the two substitute options?

A: SP0503BAHTG maintains package and electrical parameter equivalence with the original PACDN043Y4R. NSQA6V8AW5T2G requires PCB redesign due to package change and offers different clamping voltage characteristics.

Q: Are both substitute parts RoHS compliant?

A: SP0503BAHTG is RoHS3 compliant. NSQA6V8AW5T2G compliance status is not specified in available data.

Q: Which substitute part should be selected for direct replacement in existing designs?

A: SP0503BAHTG is recommended for direct replacement applications where package footprint and electrical parameters must remain unchanged from the original PACDN043Y4R specification.