RFM95W-915S2 - 915MHz LoRa Transceiver Module, 20dBm | HOPERF
Référence : RFM95W-915S2 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $15.76 | $15,76 |
| 10 | $14.2 | $142,00 |
| 100 | $12.5 | $1 250,00 |
| 500 | $11 | $5 500,00 |
| 1 000 | $9.5 | $9 500,00 |
RFM95W-915S2 Présentation
A LoRa (Long Range) transceiver is a wireless modem that uses Chirp Spread Spectrum (CSS) modulation to achieve very high receiver sensitivity and robust link margins at low data rates. LoRa sits in the sub-GHz ISM radio category, above narrowband FSK radios in range/budget and below cellular LTE in cost/complexity, and it is widely deployed in LPWAN (Low-Power Wide-Area Network) applications under standards such as LoRaWAN. The RFM95W-915S2 brings this LoRa modem together with the matching network and a 915MHz SAW filter inside a single module, eliminating most of the RF design complexity for the host.
Key features include +20dBm output power, -148dBm sensitivity (LoRa BW=125kHz, SF=12), 300kbps maximum bit rate, an SPI host interface, and a programmable bit rate on the air interface. Compared with the non-W (RFM95) variant, the W version adds an on-board PA (power amplifier) and LNA chain to support the higher +20dBm output and improved receive performance. The wide 1.8V–3.7V supply range permits direct Li-ion/Li-poly battery operation, while the SPI control port allows simple connection to microcontrollers such as STM32, ESP32, and Arduino-class boards.
The module shares the same SPI register set as the Semtech SX1276 transceiver IC, allowing engineers to port existing LoRaWAN and RadioHead drivers without firmware changes. The LoRa modem provides spreading factors from SF6 to SF12, bandwidth settings from 7.8kHz to 500kHz, and an integrated CRC/packet handler. The high receiver sensitivity and high selectivity (typically >60dB adjacent channel rejection) make the part well-suited to dense urban LPWAN deployments as well as long-range agricultural and industrial telemetry.
Typical applications include LoRaWAN end nodes, automatic meter reading, agricultural and environmental sensors, home and building automation, wireless alarm/security systems, industrial monitoring and SCADA telemetry, asset tracking, and remote control. The 915MHz variant is approved for use in regions including the US (FCC Part 15), Canada, Australia, and parts of Asia that allocate the 902–928MHz ISM band.
When designing with this module, observe PCB layout guidelines for the antenna feed - keep the antenna trace impedance at 50 ohms and place a pi-matching network close to the module's RF pad - and respect the maximum duty cycle limits imposed by regional regulators. The 'W' suffix is required whenever +20dBm output is needed; for shorter links the lower-power RFM95 variant reduces current consumption significantly.
This page synthesizes current distributor pricing, drop-in alternatives, and practical RF design notes not found in the manufacturer datasheet alone, helping engineers select and source the correct LoRa transceiver module for 915MHz IoT deployments.
Alternatives de remplacement direct pour RFM95W-915S2 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
RFM95W-868S2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
RFM95W-433S2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
RFM95PW-915S2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
RFM95W-915S2R
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SX1276IMLTRT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
RFM95W-915S2 Spécifications (publiées par le fabricant)
| Manufacturer | HOPERF (Hope Microelectronics) |
| Part Number | RFM95W-915S2 |
| Modem Type | LoRa / FSK / GFSK / GMSK / MSK / OOK |
| Operating Frequency Band | 915 MHz ISM (902–928 MHz) |
| Maximum Transmit Output Power | +20 dBm (100 mW) |
| Receiver Sensitivity | -148 dBm (LoRa mode) |
| Maximum Air Data Rate | 300 kbps |
| Tension d'alimentation | 1.8 V to 3.7 V |
| Host Interface | SPI |
| Modulation Schemes | FSK, GFSK, GMSK, MSK, OOK, LoRa (CSS) |
| Package Type | SMD Module |
| Antenna Type | External antenna via RF pad (not included) |
| Type de montage | Surface Mount |
| Compliance / Region | FCC Part 15 902–928 MHz ISM band |
| Statut RoHS | Compliant |
Configuration des broches de RFM95W-915S2
| Broche 1 | GND — Ground reference |
| Broche 2 | VCC — Supply voltage 1.8V to 3.7V |
| Broche 3 | SCK — SPI clock input |
| Broche 4 | MOSI — SPI master-out slave-in data |
| Broche 5 | MISO — SPI master-in slave-out data |
| Broche 6 | NSS — SPI chip-select (active low) |
| Broche 7 | RESET — Module reset (active low) |
| Broche 8 | DIO0 — Digital I/O 0 - interrupt / packet-RX flag |
| Broche 9 | DIO1 — Digital I/O 1 - RX timeout / FIFO level |
| Broche 10 | DIO2 — Digital I/O 2 - FHSS / RX data |
| Broche 11 | DIO3 — Digital I/O 3 - CAD detected / TX done |
| Broche 12 | ANT — RF antenna output (50 ohm) |
| Broche 13 | GND — Ground reference / RF ground |
Caractéristiques de puissance et thermiques
| Alimentation | 1.8 V to 3.7 V |
Paramètres d'alimentation et thermiques pour RFM95W-915S2 tels que publiés par le fabricant.
Applications typiques
RFM95W-915S2 convient pour 7 applications: LoRaWAN End Nodes, Automatic Meter Reading (AMR), Agricultural & Environmental Sensors, Home & Building Automation, Industrial Monitoring & SCADA Telemetry, Asset Tracking & Fleet Management, Wireless Alarm & Security Systems.
LoRaWAN End Nodes
The RFM95W-915S2 supports all LoRaWAN-required spreading factors SF7–SF12 and bandwidths 125/250/500 kHz needed for US902–928 MHz end-device operation, with +20 dBm output satisfying US FCC Part 15 duty-cycle rules. The -148 dBm sensitivity at SF12/BW125 enables several kilometers of urban LoRaWAN link budget while consuming <120 mA peak during +20 dBm TX. Placed on a small host PCB with a Li-ion cell and 915 MHz antenna, the module runs class A/B/C LoRaWAN devices with the LMIC or Arduino-LoRaWAN firmware stacks. The SX1276 register map is fully compatible with IBM's LoraMac-in-C reference.
Recommandé
Automatic Meter Reading (AMR)
AMR applications need battery-powered remote metering nodes with multi-year battery life and reliable low-rate uplink to a central collector. The RFM95W-915S2's -148 dBm LoRa sensitivity permits long-range uplink from basement utility vaults or rural installations, while the 1.8–3.7 V supply allows direct 2xAA or LiSOCl2 battery connection. The module can be configured for SF10/SF12 with narrow bandwidth for high link margin at the cost of air-time. TX current at +20 dBm peaks around 120 mA, but with infrequent transmissions the average current is sub-mA, enabling 10+ year battery life.
Recommandé
Agricultural & Environmental Sensors
Agricultural IoT deployments in fields, greenhouses, and livestock areas demand very long range at very low power. The RFM95W-915S2's high sensitivity and +20 dBm output support multi-kilometer line-of-sight links typical of farm-scale deployments, while the SX1276's CSS modulation provides high immunity to multi-path fading in vegetated environments. Combined with solar harvesting and soil/moisture sensors, the module can transmit several times per hour with a 5-year battery life. The wide 1.8–3.7 V supply range accepts direct solar-charged Li-ion battery voltages.
Recommandé
Home & Building Automation
Smart-home and building-automation systems require sub-GHz wireless links between battery-powered sensors (door, window, motion, leak detectors) and a central gateway. The RFM95W-915S2 delivers enough link margin for whole-home coverage at +14 dBm while still supporting +20 dBm for outdoor/yard sensors. The low-cost SX1276 modem, the open RadioHead/Arduino-LoRa firmware libraries, and the simple SPI interface make it ideal for low-volume custom home-automation products. Interference immunity is excellent thanks to the SX1276's >60 dB adjacent-channel rejection and LoRa CSS robustness.
Recommandé
Industrial Monitoring & SCADA Telemetry
Industrial telemetry over wide plants, oil/gas fields, and SCADA systems requires long-range, interference-immune links for sensor backhaul. The RFM95W-915S2's +20 dBm output and -148 dBm LoRa sensitivity allow multi-kilometer coverage even in metal-rich industrial environments with heavy multipath and motor-noise interference. The module's CSS modulation and high selectivity (>60 dB adjacent-channel rejection) maintain link integrity in the presence of VFD/motor noise. SPI control enables straightforward integration with industrial PLCs and RTUs using modbus-to-LoRa bridges.
Recommandé
Asset Tracking & Fleet Management
LoRa-based asset tracking combines GPS-free or GPS-aided position reporting with battery-powered, low-rate uplink to a network of fixed gateways. The RFM95W-915S2's +20 dBm output and excellent sensitivity support city-scale coverage from a small number of gateways, while its low average current fits solar- or battery-powered trackers on shipping containers, trailers, and pallets. Operating in LoRaWAN, the tracker benefits from the geolocation features of LoRaWAN 1.1 RSSI-based multilateration when GPS is unavailable. Wide operating voltage allows direct Li-ion battery connection.
Recommandé
Wireless Alarm & Security Systems
Wireless alarm panels, PIR detectors, door/window sensors, and panic buttons rely on long-range, reliable sub-GHz links to a central station. The RFM95W-915S2 supports +20 dBm output and encrypted packet modes (via the SX1276 packet engine with AES-128 user payload) for alarm event reporting, while its high sensitivity and selectivity maintain link integrity across large residential and small commercial sites. The module is FCC Part 15 compliant at 915 MHz and integrates easily with existing alarm panels through a low-cost SPI-to-UART bridge.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour RFM95W-915S2 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | RFM95W-868S2 | RFM95W-433S2 | RFM95PW-915S2 | RFM95W-915S2R | SX1276IMLTRT |
|---|---|---|---|---|---|---|
| Brand | HOPERF | HOPERF | HOPERF | HOPERF | RF Solutions | Semtech |
| Package | SMD Module (12-pin pad + RF) | SMD Module (pin-compatible) | SMD Module (pin-compatible) | SMD Module (pin-compatible) | SMD Module (pin-compatible) | QFN-24 (bare IC, not pin-compatible at module level) |
| Operating Frequency | 915 MHz ISM | 868 MHz ISM (EU) | 433 MHz ISM | 915 MHz ISM | 915 MHz ISM | 137–1020 MHz (programmable) |
| Max TX Output Power | +20 dBm | +20 dBm | +20 dBm | +22 to +23 dBm | +20 dBm | +20 dBm (with PA_BOOST pin) |
| Receiver Sensitivity | -148 dBm | -148 dBm | -148 dBm | -148 dBm | -148 dBm | -148 dBm (LoRa mode) |
| Supply Voltage | 1.8 V to 3.7 V | 1.8 V to 3.7 V | 1.8 V to 3.7 V | 1.8 V to 3.7 V | 1.8 V to 3.7 V | 1.8 V to 3.7 V |
| Host Interface | SPI | SPI | SPI | SPI | SPI | SPI |
| Max Data Rate | 300 kbps | 300 kbps | 300 kbps | 300 kbps | 300 kbps | 300 kbps |
Principaux différenciateurs
- Highest integrated output power at the 915 MHz ISM band in this footprint (vs RFM95 (non-W variant))
- Same SX1276 SPI register map as Semtech's bare IC (vs Proprietary LoRa modules with closed firmware)
- Sub-1-GHz ISM band coverage beyond 915 MHz (vs Single-band modules with fixed SAW filter)
Notes de conception
The RFM95W-915S2's antenna pad is the only RF output; route a 50-ohm controlled-impedance trace (typically grounded coplanar waveguide on FR4, Er=4.3) directly from the module's ANT pad to the antenna connector or chip antenna. Keep this trace as short as possible (under 10 mm) and avoid routing it parallel to noisy digital lines. Place a pi-network footprint (CLC) close to the ANT pad for matching - typical values are 1–10 pF NP0/C0G capacitors and a 3.3–10 nH inductor, but final values must be tuned with a VNA on the production board.
Provide a clean 1.8–3.7 V supply capable of sourcing at least 200 mA peak during +20 dBm TX bursts. Place a 10 µF X7R ceramic + 0.1 µF NP0 ceramic + 100 nF X7R ceramic capacitor network as close as possible to the module's VCC and GND pads to suppress ripple caused by the PA's pulsed current draw (typically ~120 mA during TX). A ferrite bead between the host regulator and the module VCC pad can further reduce conducted noise. Do not power the module directly from a switching regulator's output without sufficient bulk capacitance.
At +20 dBm output on the 915S2 variant the module's internal PA dissipates roughly 300–400 mW of waste heat, which can elevate the module case temperature by 15–20 °C above ambient. For continuously transmitting applications (beacon nodes, some industrial uses), provide a copper keep-out clear of copper beneath the module's thermal pad and consider an exposed ground copper pour connected to the module's GND pad to spread heat. For battery-powered intermittent applications, thermal performance is usually not a concern.
Avoid five common pitfalls: (1) connecting to a 5 V logic Arduino without level shifting on MOSI/SCK/NSS - the module's absolute-maximum Vih is 3.7 V; (2) omitting the SPI pull-up on NSS, which can float and cause spurious chip selection; (3) failing to call the SX1276 calibration sequence in firmware (ImageCal, FreqCal) after each frequency change, leading to reduced sensitivity; (4) using a non-50-ohm antenna or a mismatched chip antenna with no pi-network, causing degraded range and FCC re-test failures; (5) ignoring regional duty-cycle regulations - US FCC Part 15 allows up to 400 ms TX per 20 s for hopping channels but ETSI EN 300 220 limits to 1% or 10% duty cycle depending on sub-band.
Informations de conformité
FCC Part 15 902-928 MHz ISM band compliant when integrated with a properly matched antenna; full compliance testing is the integrator's responsibility per the module's FCC grant. RoHS compliance is per HOPERF product declaration; REACH and conflict-mineral statements were not located in the verified data and are marked unknown.
