PACDN045Y6R Equivalent & Substitute Parts

Part Overview

The PACDN045Y6R is a 5.5V Transient Voltage Suppressor (TVS) diode manufactured by onsemi, housed in a SOT-23-6 surface mount package. This component is designed for general-purpose transient voltage protection applications with a maximum clamping voltage of 8V at peak pulse current. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

PACDN045Y6R

onsemiIn Stock: 4183PACDN045Y6R Datasheet

Current PartRFQ

SMS05CT1G

onsemiIn Stock: 12304SMS05CT1G Datasheet

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SP0505BAHTG

Littelfuse Inc.In Stock: 157275SP0505BAHTG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PACDN045Y6R is determined by the following critical parameters:

• Reverse Standoff Voltage: 5V to 5.5V range
• Breakdown Voltage (Min): 6.2V
• Clamping Voltage (Max) @ Ipp: 8V to 8.5V range
• Package Type: SOT-23-6 surface mount
• Unidirectional Channels: 5 channels
• Type: Zener diode
• Mounting: Surface mount
• MSL Rating: 1 (Unlimited)

Both identified substitute parts meet these core electrical and mechanical compatibility criteria, ensuring functional equivalence in general-purpose transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are classified as active products with current manufacturing status, providing long-term availability advantages over the obsolete PACDN045Y6R. Both SMS05CT1G and SP0505BAHTG carry ROHS3 compliance certification, meeting modern environmental and regulatory requirements.

SP0505BAHTG from Littelfuse Inc. provides the closest electrical match to the original part, with identical reverse standoff voltage (5.5V) and clamping voltage (8.5V) specifications, operating within the same temperature range (-40°C ~ 85°C). This part maintains full mechanical and electrical compatibility with existing designs.

SMS05CT1G from onsemi offers extended operating temperature range (-40°C ~ 150°C junction temperature) and higher peak pulse current capability (24A at 8/20µs), providing enhanced performance margins for applications requiring elevated temperature operation or higher transient current handling.

Frequently Asked Questions (FAQ)

Q: Can SMS05CT1G be used as a direct replacement for PACDN045Y6R?

A: SMS05CT1G is electrically compatible based on core TVS parameters (5V reverse standoff, 6.2V breakdown, 5 channels, SOT-23-6 package). However, the clamping voltage specification differs (14.5V vs. 8V), which may affect circuit behavior in applications with strict voltage clamping requirements. Verify circuit tolerance to higher clamping voltage before substitution.

Q: Is SP0505BAHTG a pin-for-pin replacement?

A: Yes. SP0505BAHTG maintains identical package type (SOT-23-6), channel configuration (5 unidirectional channels), and electrical specifications (5.5V reverse standoff, 8.5V clamping voltage) as the PACDN045Y6R, providing direct mechanical and electrical compatibility.

Q: What is the difference between SOT-23-6 and TSOT-23-6 packages?

A: TSOT-23-6 is a thin variant of the SOT-23-6 package. Both are mechanically compatible with standard SOT-23-6 footprints. SMS05CT1G is available in both standard and thin variants.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both SMS05CT1G and SP0505BAHTG are ROHS3 compliant, meeting current environmental regulations for electronic components.

Q: Which substitute part should be selected for new designs?

A: SP0505BAHTG is recommended for new designs requiring direct electrical equivalence to the original specification. SMS05CT1G is suitable for applications benefiting from extended temperature range or higher transient current capability.