Nordic nRF401 is a single chip UHF transceiver designed to operate in the 433MHz ISM (Industrial, Scientific and Medical) frequency band. It features Frequency Shift Keying (FSK) modulation and demodulation capability. nRF401 operates at bit rates up to 20kbit/s. Transmit power can be adjusted to a maximum of 10dBm. Antenna interface is differential and suited for low cost PCB antennas. nRF401 features a standby mode which makes power saving easy and efficient. nRF401 operates from a single +3-5V DC supply. As a primary application, nRF401 is intended for UHF radio equipment in compliance with the European Telecommunication Standard Institute (ETSI) specification EN 300 220-1 V1.2.1.
The nRF401 is a true single‑chip UHF transceiver designed for the 433 MHz ISM band. It uses Frequency Shift Keying (FSK) modulation, supports two channels, and operates from a single +3‑5 V supply, making it suitable for alarm, security, home automation, automotive and other wireless applications.\n\nKey specifications include a maximum RF output of 10 dBm, a data rate of up to 20 kbit/s, low standby current, and a differential antenna interface with a 400 Ω load. The document provides pin assignments, electrical limits, timing diagrams, and recommended external components for antenna matching and power control.
| Frequency (Channel #1 / #2) | 433.93 / 434.33 MHz |
|---|---|
| Modulation | FSK |
| Maximum RF output power | 10 dBm |
| Supply voltage | 2.7‑5.25 V |
| Receive supply current | 250 µA |
| Transmit supply current | 8 mA |
| Standby supply current | 8 µA |
| Maximum bit rate | 20 kbit/s |
| Sensitivity | -105 dBm |
The nRF401 operates from a supply voltage of 2.7 V to 5.25 V.
The device provides two channels: 433.93 MHz (Channel #1) and 434.33 MHz (Channel #2).
The maximum RF output power is 10 dBm.
It can transmit at up to 20 kbit/s.