Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Development Boards, Kits, Programmers > Evaluation Boards > RF, RFID, Wireless Evaluation Boards

Silicon Labs SLWRB4181B

Name: SLWRB4181B
Brand: Silicon Labs
SKU: SLWRB4181B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SLWRB4181B

Manufacturer:: Silicon Labs

Category:: RF, RFID, Wireless Evaluation Boards

Package:

Datasheet:: SLWRB4181B.pdf

Description:: DBM RADIO BOARD EFR32XG21 +10

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,680

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SLWRB4181B from Silicon Labs is a plug-in radio board for EFR32xG21 2.4 GHz wireless development, featuring the EFR32MG21A010F1024IM32 SoC (1024 kB Flash, 96 kB RAM), inverted-F PCB antenna, 10 dBm RF output, and dual user LEDs (red/green). It enables rapid prototyping of Bluetooth Low Energy and Zigbee mesh applications when paired with BRD4001A or BRD4002A mainboards.

For engineers reviewing the SLWRB4181B datasheet, SLWRB4181B pinout, SLWRB4181B application, or SLWRB4181B equivalent, this page delivers verified hardware context, supported debug interfaces (J-Link, PTI, VCOM), energy profiling capability via AEM, and exact breakout pad mappings for BRD4001A/BRD4002A mainboards.

Technical Context

The SLWRB4181B implements the EFR32MG21A010F1024IM32 Wireless Gecko SoC - a 2.4 GHz, 10 dBm transceiver with ARM Cortex-M33 core, supporting Bluetooth 5.2, Zigbee 3.0, and Thread 1.3 protocols. Its RF path integrates matching network and inverted-F PCB antenna tuned for 2.400–2.4835 GHz operation.

Hardware integration relies on standardized mechanical and electrical interfaces: it mates with BRD4001A/BRD4002A mainboards via 60-pin edge connector, exposes EFR32 I/O through top/bottom breakout pads, and routes key signals (SWD, VCOM, PTI) to dedicated headers including Simplicity Connector and Mini Simplicity Connector.

Key Specifications

Parameter	Value and Actual Design Meaning
Core SoC	EF R32MG21A010F1024IM32: ARM Cortex-M33, 1024 kB Flash, 96 kB RAM, 78.4 MHz max clock
RF Frequency Band	2.400–2.4835 GHz ISM band - supports global Bluetooth LE, Zigbee, and Thread deployments
Output Power	10 dBm - sufficient for typical indoor mesh node range without external PA
Antenna Type	Inverted-F PCB antenna - integrated, no external antenna required, optimized for 50 Ω impedance match
Mainboard Compatibility	BRD4001A (Wireless Starter Kit) and BRD4002A (Wireless Pro Kit) - full J-Link, VCOM, AEM, and PTI support
Debug Interfaces	J-Link USB/Ethernet, SWD, Packet Trace Interface (PTI), Virtual COM Port - all routed to Simplicity/Mini Simplicity connectors
Power Monitoring	Advanced Energy Monitor (AEM) - real-time current/voltage profiling with µA resolution, traceable to VMCU rail

Availability

SLWRB4181B is available at Aetrix Electronics and suitable for Bluetooth LE sensor nodes, Zigbee smart home gateways, Thread border routers, and low-power IoT prototyping requiring stable component supply and full Silicon Labs ecosystem support.

Supply support for SLWRB4181B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Silicon Labs is a fabless semiconductor company specializing in secure, energy-efficient wireless SoCs and development tools for IoT applications.

The SLWRB4181B belongs to Silicon Labs' Wireless Starter Kit platform, designed to accelerate evaluation and firmware development for EFR32xG21-based 2.4 GHz wireless systems with integrated debugging, energy analysis, and protocol stack support.

FAQ

What is the SLWRB4181B used for?

The SLWRB4181B is a radio board that plugs into BRD4001A or BRD4002A mainboards to form a complete EFR32xG21 development kit. It hosts the EFR32MG21A010F1024IM32 SoC and provides RF functionality, LED indicators, and I/O access - enabling firmware development, protocol validation, and power profiling for Bluetooth LE, Zigbee, and Thread applications. The SLWRB4181B itself is not standalone; it requires a compatible mainboard to operate.

Does the SLWRB4181B include an onboard debugger?

No, the SLWRB4181B does not contain its own debugger. Debugging is provided by the mainboard (BRD4001A or BRD4002A), which integrates a SEGGER J-Link debugger supporting SWD, Virtual COM Port, Packet Trace Interface, and Advanced Energy Monitor. The SLWRB4181B connects to these features via its edge connector and exposes them through headers like Simplicity Connector and Mini Simplicity Connector.

Which EFR32 device is mounted on the SLWRB4181B?

The SLWRB4181B mounts the EFR32MG21A010F1024IM32 - a 2.4 GHz Wireless Gecko SoC with ARM Cortex-M33 core, 1024 kB Flash, 96 kB RAM, 10 dBm output power, and hardware acceleration for AES, ECC, and SHA. This exact part number is confirmed in UG429 Section 1.1 and BRD4181B feature list.

Can the SLWRB4181B be used with both BRD4001A and BRD4002A mainboards?

Yes, the SLWRB4181B is mechanically and electrically compatible with both BRD4001A (Wireless Starter Kit Mainboard) and BRD4002A (Wireless Pro Kit Mainboard). However, pin mapping to breakout pads differs between mainboards, and certain features - such as logic analyzer, joystick, and variable VMCU - are exclusive to BRD4002A. UG429 explicitly confirms SLWRB4181B usage with either mainboard.

What software tools support the SLWRB4181B?

The SLWRB4181B is fully supported by Silicon Labs Simplicity Studio - including Energy Profiler for current measurement, Network Analyzer for packet inspection, and SDKs for Bluetooth LE, Zigbee, and Thread. Firmware examples, bootloader tools, and GCC/IAR/ARM compiler integration are all validated for the EFR32MG21A010F1024IM32 on SLWRB4181B.

SLWRB4181B Specifications

Product attributes: Attribute value

Manufacturer:: Silicon Labs

Series:: -

Packaging:: Bulk

Product Status:: Active

Type:: Transceiver

Frequency:: 2.4GHz

Contents:: Board(s)

Utilized IC / Part:: EFR32xG21

SLWRB4181B FAQ

1.How can I place an order for SLWRB4181B through Aetrix?

Please submit a Request for Quotation (RFQ) for SLWRB4181B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SLWRB4181B reliable?

The price and inventory of SLWRB4181B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SLWRB4181B is usually 5 days.

3.What payment methods are accepted for SLWRB4181B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SLWRB4181B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SLWRB4181B?

SLWRB4181B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SLWRB4181B order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SLWRB4181B?

For technical support, including SLWRB4181B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SLWRB4181B requirements.

6.How does Aetrix verify that SLWRB4181B is sourced from the original manufacturer or authorized distributors?

All SLWRB4181B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SLWRB4181B meets industry standards.

7.What is the process for return or replacement of SLWRB4181B?

All SLWRB4181B units undergo pre-shipment inspection (PSI). If there is an issue with SLWRB4181B, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SLWRB4181B part is unused and in its original packaging.

Return procedure for SLWRB4181B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …