PACDN044YB5R Equivalent & Substitute Parts

Part Overview

The PACDN044YB5R is a 4-channel unidirectional 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 industrial temperature range of -40°C to 85°C. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

PACDN044YB5R

onsemiIn Stock: 19261PACDN044YB5R Datasheet

Current PartRFQ

SP0504BAJTG

Littelfuse Inc.In Stock: 8581SP0504BAJTG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PACDN044YB5R is determined by the following critical parameters:

• Unidirectional Channels: Must be 4 channels to maintain circuit protection topology
• Voltage - Reverse Standoff (Typ): Must be 5.5V to ensure proper standoff operation in the protected circuit
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable range (8V nominal) to limit transient voltage peaks
• Package / Case: Must be 5-TSSOP, SC-70-5, or SOT-353 for mechanical and electrical compatibility
• Mounting Type: Must be Surface Mount for PCB integration compatibility
• Operating Temperature Range: Must support -40°C ~ 85°C minimum

The SP0504BAJTG from Littelfuse Inc. meets all substitution criteria and is classified as an active product, providing long-term availability and design continuity.

Parameter Comparison

Engineering Selection Recommendations

The SP0504BAJTG is the qualified substitute for the obsolete PACDN044YB5R. Selection is based on the following factors:

Product Status: The SP0504BAJTG maintains active product status with Littelfuse Inc., ensuring continued availability, technical support, and manufacturing consistency. The PACDN044YB5R is obsolete and subject to supply discontinuation.

Regulatory Compliance: Both components maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring no regulatory barriers to substitution. The SP0504BAJTG carries RoHS3 compliance certification, meeting current environmental standards.

Electrical Compatibility: The SP0504BAJTG operates within the same reverse standoff voltage specification (5.5V) and maintains compatible clamping voltage performance (8.5V versus 8V nominal). The 0.5V differential in clamping voltage remains within acceptable transient suppression tolerances for general-purpose applications.

Mechanical and Thermal Compatibility: Identical package designation (SC-70-5, SOT-353), mounting type (Surface Mount), and operating temperature range (-40°C ~ 85°C) ensure direct PCB integration without design modification.

Frequently Asked Questions (FAQ)

Q: Can the SP0504BAJTG directly replace the PACDN044YB5R without PCB modifications?

A: Yes. Both components share identical package designation (5-TSSOP, SC-70-5, SOT-353), pin count (5 pins), and mounting type (Surface Mount). No PCB layout changes are required for mechanical substitution.

Q: What is the significance of the 0.5V difference in clamping voltage (8V vs. 8.5V)?

A: The SP0504BAJTG clamping voltage of 8.5V remains within acceptable transient suppression performance for general-purpose applications. This differential does not compromise circuit protection function and is typical among equivalent TVS diode families.

Q: Why is product status important for this substitution?

A: The PACDN044YB5R is classified as obsolete, indicating onsemi has discontinued manufacturing and will not guarantee future availability. The SP0504BAJTG is active, ensuring long-term procurement reliability and continued technical support from Littelfuse Inc.

Q: Are there any compliance or certification differences between these parts?

A: Both components maintain identical REACH and ECCN classifications. The SP0504BAJTG carries additional RoHS3 compliance certification, which aligns with current environmental and regulatory requirements for electronic components.

Q: What does the 4-channel unidirectional configuration mean for circuit protection?

A: The 4-channel unidirectional design provides independent overvoltage protection for four separate signal lines or power rails within a single package. Substitution requires maintaining this 4-channel architecture to preserve the intended circuit protection topology.

Q: Is the operating temperature range identical between both parts?

A: Yes. Both the PACDN044YB5R and SP0504BAJTG operate across -40°C to 85°C (TA), ensuring thermal compatibility across industrial and commercial temperature environments.