WT11U-E-AI5C Equivalent & Substitute Parts

Part Overview

The WT11U-E-AI5C is a Bluetooth v2.1 +EDR Class 1 RF transceiver module manufactured by Silicon Labs. This surface mount module features a U.FL connector for external antenna attachment and supports multiple serial interfaces including SPI, UART, and USB. The product is classified as obsolete, necessitating identification of functionally compatible alternatives for new designs and ongoing system support.

Substiute Parts

WT11U-E-AI5C

Silicon LabsIn Stock: 1069WT11U-E-AI5C Datasheet

Current PartRFQ

BT122-A-V2

Silicon LabsIn Stock: 1065BT122-A-V2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WT11U-E-AI5C is determined by the following critical parameters:

RF Standard Compatibility: Both the main part and substitute must operate within the Bluetooth frequency band and support compatible protocol versions.

Voltage Supply Range: The substitute must operate within or encompass the 2.7V ~ 3.6V supply voltage range of the original part.

Mounting Type: Surface mount packaging is required to maintain PCB integration compatibility.

Operating Temperature Range: The substitute must support the -40°C ~ 85°C operating temperature specification.

Manufacturer Consistency: Silicon Labs maintains design continuity and firmware compatibility across its Bluetooth module product line.

The BT122-A-V2 qualifies as a substitute based on these parameters: it operates on the Bluetooth standard, supports the required voltage range, uses surface mount packaging, maintains the operating temperature specification, and is manufactured by Silicon Labs.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The WT11U-E-AI5C is classified as obsolete, while the BT122-A-V2 maintains active product status. For new designs and long-term system support, the BT122-A-V2 is the appropriate selection.

Compliance and Certifications: Both parts share identical ECCN (5A992C) and HTSUS (8517.62.0090) classifications. The BT122-A-V2 includes RoHS3 compliance certification and REACH unaffected status, providing enhanced regulatory alignment for current manufacturing standards.

Voltage Supply Compatibility: The BT122-A-V2 extends the lower voltage limit to 2.2V, providing broader operational flexibility while maintaining full compatibility with the original 2.7V ~ 3.6V range.

Protocol Evolution: The BT122-A-V2 implements Bluetooth v4.2 +EDR, representing a protocol advancement from the v2.1 +EDR specification of the WT11U-E-AI5C. This upgrade provides improved performance characteristics and backward compatibility considerations for system integration.

Frequently Asked Questions (FAQ)

Q: Can the BT122-A-V2 directly replace the WT11U-E-AI5C in existing designs?

A: Direct replacement requires PCB layout modification. The BT122-A-V2 uses a 20-SMD package compared to the 28-SMD package of the WT11U-E-AI5C, necessitating footprint redesign. Additionally, the BT122-A-V2 features an integrated trace antenna, eliminating the need for external U.FL antenna components present in the original design.

Q: What are the key differences in antenna configuration?

A: The WT11U-E-AI5C requires an external antenna connected via U.FL connector. The BT122-A-V2 incorporates an integrated trace antenna on the module itself, reducing component count and PCB space requirements.

Q: Are the serial interfaces compatible between these modules?

A: The WT11U-E-AI5C supports SPI, UART, and USB interfaces. The BT122-A-V2 supports ADC, GPIO, I2C, and UART interfaces. UART is common to both modules. Applications requiring SPI or USB functionality must implement alternative communication protocols or select different substitute components.

Q: What is the impact of the protocol version difference?

A: The BT122-A-V2 implements Bluetooth v4.2 +EDR while the WT11U-E-AI5C uses Bluetooth v2.1 +EDR. Bluetooth v4.2 provides enhanced range, lower power consumption, and improved security features. Legacy systems designed for v2.1 +EDR operation require firmware and application validation when migrating to v4.2 +EDR modules.

Q: How do the power output specifications compare?

A: The WT11U-E-AI5C delivers 17dBm output power, while the BT122-A-V2 provides 11dBm. Applications requiring maximum transmission range may experience reduced coverage with the BT122-A-V2. The BT122-A-V2 offers superior sensitivity at -95dBm compared to -88dBm, partially offsetting the lower transmit power.

Q: What compliance advantages does the BT122-A-V2 provide?

A: The BT122-A-V2 includes RoHS3 compliance and REACH unaffected status certifications. The WT11U-E-AI5C compliance documentation does not specify these certifications. For applications subject to current environmental and hazardous substance regulations, the BT122-A-V2 provides documented compliance alignment.