The 315 MHz frequency is part of the UHF (Ultra High Frequency) band and is widely used for low-power, short-range wireless communication in the Americas and parts of Asia. Known for its excellent penetration and low interference potential , 315 MHz is a cornerstone of keyless entry systems , remote controls , and unlicensed IoT applications .
It is especially favored in ITU Region 2 (🌎) , where it’s allocated for license-exempt use under specific technical constraints.
Center Frequency : 315 MHzCommon Operating Band : 314–316 MHzBand Class : UHFITU Allocation : Region 2 focus (Americas)
🌐 Region Frequency Allocation Primary Use Licensing 🌎 Region 2 314–316 MHz Remote keyless entry, garage doors, IoT License-exempt (FCC Part 15) 🌍 Region 1 Not standardized Rare use; 433 MHz preferred Often unallocated 🌏 Region 3 Some usage in Japan and Korea Similar to Region 2 Conditional licensing
Application Description Keyless Entry Systems Vehicle fobs and door locks commonly use 315 MHz in the Americas Garage Door Openers Popular due to minimal interference and reliable propagation Remote Controls Consumer and industrial remotes for lighting, gates, etc. Short-Range IoT Devices Environmental sensors, alarms, asset tracking Industrial Automation Conveyor controls, motorized blinds, and smart actuators
Region 2 (FCC Part 15) :
License-exempt under Part 15.231 , with limitations on duty cycle and bandwidth
Max ERP: typically 10–50 mW depending on modulation
Must not cause harmful interference and accept any received interference
Outside Region 2 :
Usage is limited or disallowed; 433 MHz often takes its place
Parameter Typical Values Max Power (ERP) 10–50 mW (license-exempt) Modulation ASK, FSK, OOK Bandwidth 10–20 kHz typical Range ~100 m line-of-sight; 10–30 m indoors Antenna Size ~23–24 cm quarter-wave monopole
Regulation Details FCC Part 15.231 Governs periodic transmissions, low-power RF controls IC RSS-210 Canadian equivalent for unlicensed low-power devices Japan ARIB STD-T107 Covers SRDs using similar bands in Japan
Band Frequency Range Use 260–290 MHz Military, meteorology (radiosondes) 300–322 MHz Partially reserved; radar, ISM in some countries 315 MHz SRDs: keyless entry, IoT (Region 2) 400–470 MHz Land mobile, amateur, LPWAN, ISM (433/450 MHz popular)
315 MHz is less congested than 433 MHz, especially in the U.S.
Reduced co-channel interference due to narrower adoption
Can suffer interference in dense urban deployments or industrial zones
Devices must limit on-time and emissions to minimize cross-talk
Propagation is better than 433 MHz indoors due to slightly lower frequencyCommon in automotive-grade transceivers (e.g., TI, Microchip, NXP)
Lower antenna size vs. 433 MHz (~23 cm vs 17 cm for ¼ wave)
Some SRDs switch between 315/433 for regional compliance
Attribute Value/Details Center Frequency 315 MHz ITU Region Focus Region 2 (Americas) Primary Use Keyless entry, remote control, IoT License Required? No (Part 15-compliant) Typical Power 10–50 mW ERP Modulation ASK, FSK, OOK Band Status License-exempt, narrowband Common Chipsets CC1101, MICRF112, ATA5724, etc.
