Parallax Inc. 28446 RFID Tag 125kHz Equivalent & Substitute Parts

Part Overview

The Parallax Inc. 28446 is a passive RFID tag operating at 125kHz frequency, designed for nail-form factor applications. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The 28446 provides basic RFID identification functionality in a specialized physical form factor suitable for embedded tracking applications.

Substiute Parts

28446

Parallax Inc.In Stock: 77828446 Datasheet

Current PartRFQ

HT2DC20S20/F/RSP

NXP SemiconductorsIn Stock: 18156HT2DC20S20/F/RSP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete Parallax Inc. 28446 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Frequency Match: 125kHz operation is mandatory for reader compatibility
• Technology Type: Passive RFID technology without external power source
• Standards Compliance: ISO 11784 and ISO 11785 standards ensure interoperability with 125kHz RFID infrastructure
• Operating Temperature: Substitute must support the required temperature range or exceed it
• Regulatory Compliance: RoHS and REACH compliance status for supply chain acceptance

The NXP Semiconductors HT2DC20S20/F/RSP qualifies as a substitute based on matching frequency, passive technology, and standards compliance. The substitute offers enhanced specifications including read/write capability and expanded user memory, while maintaining backward compatibility with 125kHz RFID systems.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: NXP Semiconductors HT2DC20S20/F/RSP

The HT2DC20S20/F/RSP is the qualified substitute for the obsolete Parallax Inc. 28446. Selection is based on:

1. Frequency Alignment: Both components operate at 125kHz, ensuring compatibility with existing RFID reader infrastructure
2. Technology Consistency: Both utilize passive RFID technology, requiring no external power source
3. Standards Certification: The NXP component is certified to ISO 11784 and ISO 11785, establishing interoperability with standardized 125kHz RFID systems
4. Regulatory Compliance: The substitute maintains RoHS compliance (ROHS3 revision) and is REACH unaffected, meeting current supply chain requirements
5. Enhanced Specifications: The substitute provides read/write capability with 256 bytes of user memory, offering functional improvements over the original component
6. Extended Temperature Range: Operating range of -40°C ~ 85°C exceeds the original specification, providing broader environmental compatibility
7. Active Product Status: The substitute is in active production with confirmed inventory availability (18062 units in stock)

Physical Form Factor Consideration: The NXP substitute is supplied in encapsulated form with dimensions 0.469" L x 0.232" W (11.90mm x 5.90mm). Applications requiring the original nail-form factor must evaluate mechanical integration requirements independently.

Frequently Asked Questions (FAQ)

Q: Can the NXP HT2DC20S20/F/RSP directly replace the Parallax 28446 in existing systems?

A: Frequency and passive technology compatibility confirm functional substitution for 125kHz RFID reader systems. Physical form factor differs; mechanical integration must be evaluated for specific applications.

Q: What standards compliance ensures the substitute will work with existing 125kHz RFID infrastructure?

A: ISO 11784 and ISO 11785 certification on the NXP component establishes compatibility with standardized 125kHz RFID systems. These standards define air interface protocols and data formats for animal identification and tracking applications.

Q: Does the substitute offer any functional advantages over the original component?

A: The NXP HT2DC20S20/F/RSP provides read/write capability with 256 bytes of user memory, compared to the read-only specification of the original Parallax component. Extended operating temperature range (-40°C ~ 85°C versus -25°C ~ 85°C) provides broader environmental compatibility.

Q: Are there regulatory or compliance differences between the two components?

A: Both components maintain RoHS compliance. The substitute is ROHS3 compliant (current revision) and REACH unaffected. ECCN classifications differ (EAR99 for original, 5A992C for substitute) due to enhanced capabilities; export control requirements must be verified for specific jurisdictions.

Q: What is the significance of the "Bulk" packaging for the NXP substitute?

A: Bulk packaging indicates supply in standard quantities without specialized encapsulation. The component itself is encapsulated (11.90mm x 5.90mm dimensions), but packaging format differs from the original nail-form factor. Procurement quantities and handling procedures should reflect bulk supply specifications.

Q: Why is the Parallax 28446 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The NXP HT2DC20S20/F/RSP, with active product status and confirmed inventory, provides continuity for applications requiring 125kHz passive RFID functionality.