WT11U-E-AI55C Equivalent & Substitute Parts

Part Overview

The WT11U-E-AI55C is an RF transceiver module manufactured by Silicon Labs, designed for surface mount applications. This module integrates radio frequency transmission and reception capabilities in a compact SMD package. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement planning.

Substiute Parts

WT11U-E-AI55C

Silicon LabsIn Stock: 987WT11U-E-AI55C Datasheet

Current PartRFQ

BT122-A-V2

Silicon LabsIn Stock: 1065BT122-A-V2 Datasheet

MFR RecommendedRFQ

RN42N-I/RM

Microchip TechnologyIn Stock: 3936RN42N-I/RM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the WT11U-E-AI55C is determined by alignment across the following critical parameters:

• Mounting Type: Surface Mount (required for PCB integration compatibility)
• Package Category: Module (functional form factor)
• Regulatory Compliance: RoHS and ECCN classification (5A992C)
• Environmental Rating: MSL 3 (168 Hours) for storage and handling
• Tariff Classification: HTSUS 8517.62.0090 (RF transceiver modules)

Two substitute parts meet these criteria with varying degrees of functional alignment:

BT122-A-V2 (MFR Recommended): Active product from Silicon Labs with enhanced specifications and modern Bluetooth v4.2 +EDR protocol support.

RN42N-I/RM (Similar): Obsolete product from Microchip Technology with legacy Bluetooth v2.1 +EDR protocol support.

Parameter Comparison

Engineering Selection Recommendations

BT122-A-V2 is the primary substitute option. This part maintains manufacturer continuity (Silicon Labs), holds active product status ensuring ongoing support and availability, and carries current ROHS3 compliance certification. The 20-SMD module package provides a compact form factor suitable for modern surface mount assembly processes.

RN42N-I/RM serves as an alternative substitute but carries obsolete product status classification, identical to the original part. Selection of this alternative does not resolve long-term supply or support concerns. The 24-SMD module package differs in pin count and footprint from the original WT11U-E-AI55C, requiring PCB layout verification before implementation.

Both substitute parts maintain identical regulatory classifications (ECCN 5A992C, HTSUS 8517.62.0090) and environmental ratings (MSL 3), ensuring compliance continuity in regulated applications.

Frequently Asked Questions (FAQ)

Q: Why is the WT11U-E-AI55C classified as obsolete?

A: Obsolete classification indicates the manufacturer has discontinued production and support. Substitute parts must be identified to maintain system functionality and ensure future procurement availability.

Q: What are the primary differences between BT122-A-V2 and RN42N-I/RM?

A: BT122-A-V2 is an active product from Silicon Labs with Bluetooth v4.2 +EDR protocol support, while RN42N-I/RM is an obsolete Microchip product with Bluetooth v2.1 +EDR protocol support. BT122-A-V2 offers modern protocol capabilities and ongoing manufacturer support.

Q: Are the package footprints compatible between WT11U-E-AI55C and the substitutes?

A: Package compatibility requires direct comparison of pinout and mechanical dimensions. WT11U-E-AI55C uses a Module package, BT122-A-V2 uses a 20-SMD Module, and RN42N-I/RM uses a 24-SMD Module. PCB layout verification is necessary before substitution.

Q: Do all parts meet the same regulatory requirements?

A: Yes. All three parts share identical ECCN (5A992C) and HTSUS (8517.62.0090) classifications, and all meet RoHS compliance standards with MSL 3 (168 Hours) environmental rating.

Q: Which substitute should be selected for new designs?

A: BT122-A-V2 is recommended for new designs due to active product status, modern protocol support, and ongoing manufacturer availability and technical support.