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Press release - CIRCUIT DESIGN,INC.

June 30, 2020

Announcing the LMD-401 radio transceiver module for industrial applications in North America

Circuit Design, Inc., the leading supplier of low-power radio modules, is releasing the RF transceiver module LMD-401 for industrial applications. The LMD-401 is an RF module that is certified with FCC Part 90 in the United States and ISED RSS-119 in Canada.

The LMD-401 has been developed as a successor to the highly rated LMD-400-R, a compact integrated module with the long-range transmission, battery operation, and excellent interference rejection characteristics demanded for use in radio equipment. The LMD-401 is pin-compatible with the LMD-400-R, and as well as retaining equivalent performance, enables reduced current consumption and a greater operating temperature range. Users can set any frequencies*1 within the 458 MHz to 462.5 MHz band, and RF output within this band gives improved flatness. Receiver performance includes superior interference rejection characteristics that fulfill the highest European EN300220 receiver standard, category 1.
*1 12.5 kHz step


With the LMD-401, Circuit Design covers license bands in North America, and alongside the STD-302Z RF transceiver module*2, which covers ISM bands in Europe and Asia, offers a range of integrated radio modules for industrial use in the 400 MHz band*3. These models are designed to have low spurious emissions and superior interference rejection capabilities. Users can expect stable operation, even in a site where multiple radio units are being operated simultaneously.
*2 The STD-302Z and LMD-401 are interface compatible.
*3 The 400 MHz band is suited to radio control applications in a site where limited line of sight environments and numerous obstructions are present, for example on construction sites.

Circuit Design’s line-up of radio transceivers for industrial applications

Models LMD-401 STD-302Z
Frequency (MHz) 458-462.5 419 429 434 447 458
Market US China Japan *4 EU *5 Korea UK
Power (mW) 10 10 10 10 10 10
CH space (kHz) 12.5 25 12.5 25 12.5 25
Data rate (bps) 4800 9600 4800 9600 4800 9600
Sensitivity (dBm) *6 -116
-118 -120 -119 -120 -119

*4 1216/1252MHz versions are also available
*5 869MHz version is also available
*6 RX Sensitivity 12dB SINAD

Circuit Design has maintained the interface while at the same time updating internal circuits, thereby realizing the provision of long-term stability demanded of industrial equipment. A decade has passed since the release of our first-generation model, the LMD-400, and as well as responding to the demand for continuity expected by our users, we will realize stable supply with the addition of even greater improvements.

Available July 2020

Tecnical features

FCC Part 90 and ISED RSS119 certified
12.5kHz channel spacing Narrow band FM
High receiver sensitivity with double superheterodyne receiver circuit
Superior receiver performance (EN300220 category 1 receiver equivalent)
4800 bps data rate
Transparent data interface:
Simple and easy serial data interface allowing use of user-specific protocols
Operating voltage: 3.0 to 5.5 V
Typ. 46 mA / TX, 36 mA / RX
Operating temperature range: -20 to +65 °C


Industrial remote control
Telemetry and monitoring systems

About Circuit Design

Circuit Design, Inc. designs and supplies low power radio modules for various application fields such as telecontrol, telemetry, alarms, serial data transmission and audio. The products comply with European ETSI, US FCC, Canada ISED and Japanese ARIB standard. Quality is assured with an ISO9001-certified design and manufacturing process based in Japan.

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