Ai-Thinker NF-05-S Ci24R1 2.4GHz Wireless Transceiver Module The Ai-Thinker NF-05-S is a 2.4GHz wireless transceiver module based on the Ci24R1 RF chip. It uses a DIP-8 module format, onboard PCB antenna, and SPI host interface for compact embedded wireless data-link hardware. According to the official NF-05-S specification, the module supports the 2.4GHz ISM band, GFSK / FSK modulation, 2Mbps / 1Mbps / 250kbps data rates, ARQ support, 1-bit RSSI, low-power operation, and a fast mode-switching time of less than 160us. The supply range is 2.1V to 3.6V with 3.3V typical operation. For related OpenELAB wireless modules and accessories, compare the Ai-Thinker NF-05 Ci24R1 2.4GHz Module, Ai-Thinker NF-01-S Si24R1 2.4GHz Module, Ai-Thinker NF-03 Si24R1 2.4GHz Module, Ai-Thinker NF-04 BK2425 2.4GHz Module, and NRF24L01 2.4GHz Wireless Module. Technical Specifications Parameter Value Brand Ai-Thinker Model NF-05-S OpenELAB SKU AT-NF-05-S Product Type 2.4GHz wireless transceiver module RF Chip Ci24R1 Package DIP-8 Module Size 28.6 x 15.2 x 12mm, +/-0.2mm Antenna Interface Onboard PCB antenna Frequency Band 2.4GHz ISM band Operating Frequency 2400MHz to 2525MHz Modulation GFSK / FSK Data Rates 2Mbps, 1Mbps, and 250kbps Host Interface SPI interface, up to 10MHz according to the official specification Available IO Quantity 3 IO listed by the official main-parameter table RF Output Power 8 +/-2dBm listed for 250kbps, 1Mbps, and 2Mbps in the official RF table Receive Sensitivity -91dBm at 250kbps, -85dBm at 1Mbps, and -78dBm at 2Mbps Baseband Features ARQ support and 1-bit RSSI listed by the official feature table Mode Switching Less than 160us listed by the official feature table Supply Voltage 2.1V to 3.6V, 3.3V typical Recommended Supply Current Greater than 100mA supply capability listed in the official related-model table Transmit Current Reference 36.6mA typical in TX power output mode at 3.3V and 25C Receive Current Reference 16.0mA typical in RX test mode at 3.3V and 25C Standby Current Reference 52.9uA typical reference value at 3.3V and 25C Low-Power Current Reference 1.3uA typical reference value at 3.3V and 25C Pins GND, SCK, MISO / DATA / IQ, VCC, CSN, and NC pins listed in the official pin table Operating Temperature -40C to 85C Storage Environment -40C to 125C, less than 90%RH Packaging Reference 45 pieces per tray listed by the official packaging section Integration Notes & Hardware Guidance Power Supply - Keep VCC within 2.1V to 3.6V and reserve more than 100mA current capacity for stable RF operation. Ripple Control - Prefer a clean 3.3V rail and add local filtering close to the module power pins. Antenna Clearance - Keep the onboard PCB antenna exposed and away from metal parts, shields, relays, and dense high-frequency components. Board Placement - Place the antenna section near the PCB edge where possible to reduce detuning from the main board and enclosure. SPI Planning - Confirm SPI mode, bus speed, and host IO voltage before production; keep the SCK, CSN, and data signal routing short. Low-Power Design - Review sleep, standby, and wake timing when the host firmware relies on battery-powered operation. RF Validation - Validate range with the final enclosure, antenna orientation, selected data rate, channel plan, and interference conditions. ESD Protection - Treat the module as an electrostatic-sensitive RF device during handling, soldering, and testing. Production Test - Reserve accessible test points for power, ground, SPI, and RF functional checks on the assembled product. Packing List 1 x Ai-Thinker NF-05-S 2.4GHz Ci24R1 Wireless Transceiver Module FAQ Q: Which RF chip does NF-05-S use?A: The official specification identifies NF-05-S as a 2.4GHz module based on the Ci24R1 RF chip. Q: What data rates are supported?A: The official feature table lists 2Mbps, 1Mbps, and 250kbps data rate support. Q: What frequency range does it cover?A: The RF table lists 2400MHz to 2525MHz operation in the 2.4GHz ISM band. Q: What is the supported supply voltage?A: The official electrical table lists 2.1V to 3.6V, with 3.3V typical operation. Q: Does NF-05-S include an antenna?A: Yes. The official related-model table lists PCB antenna support for NF-05-S. Q: What is the listed receive sensitivity?A: The official RF table lists -91dBm at 250kbps, -85dBm at 1Mbps, and -78dBm at 2Mbps. Q: How is NF-05-S different from NF-05?A: The official related-model table lists NF-05-S as the DIP-8 version with a 28.6 x 15.2 x 12mm module size, while NF-05 is the smaller SMD-8 version.
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