WSSFM10R4AT - Sigfox RC4 RF Module, 1GHz, 31-Pin SMD | Wisol
MPN: WSSFM10R4AT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $9.2 | $92.00 |
| 100 | $8.45 | $845.00 |
| 500 | $7.8 | $3,900.00 |
| 1,000 | $7.15 | $7,150.00 |
WSSFM10R4AT Overview
A Sigfox RC4 RF module is a pre-certified radio module that operates on the 920-923 MHz band with Sigfox-defined duty-cycle and ETSI/FCC-style emission profiles. The module abstracts the radio PHY and regional regulatory requirements, allowing embedded developers to focus on application logic rather than RF design, antenna matching, or protocol certification. Sigfox modules sit within the broader category of low-power wide-area network (LPWAN) wireless modules, alongside LoRaWAN and NB-IoT modules, but offer a managed operator-supplied network service.
Key features of the WSSFM10R4AT include Sigfox RC4 zone certification, an integrated S2-LP sub-1 GHz transceiver with ETSI EN 300 220 compliance, UART and SPI host interfaces, low-power standby modes suitable for battery-powered IoT deployments, and an onboard STM32 MCU for application-level firmware execution. The module supports the bidirectional Sigfox protocol and is pre-loaded with the Sigfox modem library.
Typical applications include battery-powered IoT sensor nodes, asset tracking and fleet management devices, smart agriculture soil moisture and livestock monitors, smart city infrastructure (parking sensors, environmental monitors), industrial telemetry and remote meter reading, and wireless alarm systems. The 13x20 mm footprint is significantly smaller than the prior WSSFM10P module generation, enabling compact end-product designs.
When designing with this module, ensure the host microcontroller issues AT commands (or runs the Sigfox modem library) over UART at the supported baud rates, and provide adequate clearance around the antenna area to preserve the Sigfox RC4 RF performance budget. Keep module supply voltage within the datasheet range and observe solder-profile recommendations for the 31-pin SMD land pattern during SMT assembly.
Drop-in alternatives for WSSFM10R4AT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with WSSFM10R4AT (same form factor and footprint) — differing in Manufacturer, Mounting Type, Host Interface, Module Type, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
WSSFM10R2AT
✅ Drop-In📋 Reference alternative (not in catalog)
WSSFM11R2DAT
✅ Drop-In✓ In Stock
$6.95 / Unit
View Datasheet →WSSFM10P
✅ Drop-In📋 Reference alternative (not in catalog)
WSSFM10R4AT Specifications (manufacturer-published)
| Manufacturer | Wisol (Seong Ji) |
| Module Type | Sigfox RC4 RF transceiver module |
| RF Frequency Band | 920 MHz to 923 MHz (Sigfox RC4) |
| RF Transceiver IC | S2-LP sub-1 GHz transceiver |
| Host MCU | STM32 (integrated) |
| Number of Pins | 31 |
| Package | SMD, 13 mm x 20 mm SMT |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T/R) |
| Protocol | Sigfox bidirectional (RC4) |
| Host Interface | UART, SPI |
| Compliance | Sigfox RC4 certified, RoHS |
WSSFM10R4AT Interfaces & Connectors
No manufacturer-published interface list is available for WSSFM10R4AT. Refer to the manufacturer documentation for connector and header details.
Refer to the manufacturer documentation for the full expansion header pinout and connector pin numbering.
Typical Applications
WSSFM10R4AT is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Asset Tracking and Fleet Management, Smart Agriculture and Livestock Monitoring, Smart City Infrastructure, Industrial Telemetry and Remote Meter Reading, Wireless Alarm and Security Systems.
Battery-Powered IoT Sensor Nodes
The WSSFM10R4AT is purpose-built for battery-powered IoT sensor nodes deployed on the Sigfox RC4 920-923 MHz network across Latin America and parts of Asia-Pacific. Its integrated S2-LP sub-1 GHz transceiver offers +14 dBm typical TX power and roughly -120 dBm RX sensitivity at the Sigfox narrowband data rate, yielding a link budget sufficient for deep-indoor and rural deployments without external PA. The on-board STM32 MCU hosts application code and the Sigfox modem library, so designers do not need an external host MCU for simple sensor-to-cloud integrations. Quiescent current in sleep mode is dominated by the module's standby current rather than RF, allowing multi-year battery life when duty-cycled to fewer than one uplink per hour. A typical circuit places the WSSFM10R4AT between a 3.0 V lithium primary cell and a sensor stack (temperature, soil moisture, or asset-tilt), with UART wired to a debug header during development. Best deployed when the Sigfox network coverage is already proven in the target region; otherwise fall back to LoRaWAN alternatives for unverified zones.
Recommended
Asset Tracking and Fleet Management
Fleet operators and logistics integrators can deploy the WSSFM10R4AT inside sealed asset-tracking units to transmit GPS-less or GPS-assisted location pings over the Sigfox RC4 network. The module's narrow-band Sigfox modulation is resilient to fading in dense urban and indoor-cargo scenarios, and its 13x20 mm footprint allows integration into compact tracking tags. Bidirectional Sigfox frames support on-demand downlink configuration changes from the fleet-management backend without physical access to the unit. A common topology pairs the WSSFM10R4AT with a low-power accelerometer and an optional GPS receiver; the MCU wakes the radio only when motion or a heartbeat timer fires, keeping average current draw below the budgets of coin-cell power. Compared with cellular IoT modules, the WSSFM10R4AT is cheaper to operate (Sigfox subscription model is per-device), but payload size is limited to 12 bytes per uplink, which constrains rich telemetry.
Recommended
Smart Agriculture and Livestock Monitoring
Agricultural deployments across Latin America and Asia-Pacific benefit from the WSSFM10R4AT's Sigfox RC4 certification, which removes the burden of per-country RF certification in the 920-923 MHz band. Soil-moisture probes, irrigation valve controllers, livestock collar tags, and greenhouse climate monitors can be built around the module, transmitting every few hours on duty-cycle-permitted Sigfox channels. The narrow-band link budget reaches from a deep field or stable to a base station several kilometers away, which is the typical Sigfox coverage profile for rural Latin America. A practical board hosts the WSSFM10R4AT, a low-power sensor front-end, a primary lithium cell, and an optional solar trickle charger. Solar-assisted agricultural nodes must honor the module's maximum supply voltage and use a Schottky-blocked or buck-regulated rail to avoid damage during sun peak. Compared with LoRa end-devices, the module trades flexibility (private network) for managed-operator coverage that is already deployed in many target countries.
Recommended
Smart City Infrastructure
Smart-city deployments including parking-space sensors, streetlight fault reporters, environmental-quality monitors, and waste-bin fill-level sensors rely on the WSSFM10R4AT when the roll-out region is Latin America or selected Asia-Pacific countries. The module's pre-certified 920-923 MHz RF front-end lets cities integrate Sigfox end-nodes without repeated anechoic-chamber testing, and the small 13x20 mm land pattern fits into sensor housings as small as a coin-cell key fob. Network operators bill per-device annually, which scales well across thousands of city-owned sensors. The bidirectional Sigfox protocol allows the city back-office to push configuration updates or firmware identifiers via the downlink channel. Engineers should consult the Sigfox backend message-size rules (12 bytes uplink, 8 bytes downlink) when designing payloads, and they should place the module's antenna at the highest point of the housing to preserve the RC4 link budget in dense urban deployments.
Recommended
Industrial Telemetry and Remote Meter Reading
Utility operators deploying smart water, gas, or electricity meters across Latin America and parts of Asia-Pacific can integrate the WSSFM10R4AT inside meter enclosures to deliver daily or hourly reads over the Sigfox RC4 network. The module's narrow-band 920-923 MHz signal penetrates concrete meter vaults and metal cabinets better than 2.4 GHz alternatives, an essential property when meters are recessed below ground or behind service doors. Its low duty-cycle Tx profile keeps battery life of the meter consistent with 10-year utility targets when transmitting only a few frames per day. A typical meter schematic pairs the module with an existing meter-pulse interface, a tamper sensor, and a primary lithium cell with capacity sufficient for the design lifetime. Designers must check the per-country sub-band duty-cycle rules within RC4 before locking down messaging frequency, since Brazil, Mexico, and Argentina each publish slightly different sub-band allocation notes that affect uplink cadence.
Recommended
Wireless Alarm and Security Systems
Security-system OEMs can integrate the WSSFM10R4AT inside battery-powered intrusion detectors, panic buttons, and perimeter alarms sold across Latin America and selected Asia-Pacific regions. The module's narrow-band 920-923 MHz Sigfox signal is difficult for jammers to disrupt with broadband noise, and the bidirectional protocol lets the alarm panel confirm trigger events back to the central monitoring station. A typical detector pairs the WSSFM10R4AT with a PIR sensor, a reed switch, or a glass-break detector, supervised by the on-board STM32 MCU. The tiny 13x20 mm footprint allows the module to fit inside ultra-compact alarm enclosures alongside a CR123A or AA lithium cell. Engineers should validate the Sigfox operator coverage map at the install site before deployment; if coverage is missing, the alarm can fall back to local siren-only operation rather than transmitting.
Recommended
Recommended Products Summary
Engineering reference data for WSSFM10R4AT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | WSSFM10R2AT | WSSFM11R2DAT | WSSFM10P |
|---|---|---|---|---|
| Brand | Wisol (Seong Ji) | Wisol (Seong Ji) | Wisol (Seong Ji) | Wisol (Seong Ji) |
| Package / Footprint | SMD 13x20 mm 31-pin | SMD 13x20 mm 31-pin (same) | SMD 13x20 mm 31-pin (same) | SMD 13x20 mm 31-pin (same) |
| Sigfox Regional Zone | RC4 (920-923 MHz) | RC2 (868 MHz, EU) | RC2/RC4 dual | RC1/RC2 (legacy) |
| RF Transceiver IC | S2-LP sub-1 GHz | S2-LP sub-1 GHz | S2-LP class | S2-LP class (legacy) |
| Host MCU | STM32 integrated | STM32 integrated | STM32 integrated | STM32 integrated |
| Host Interface | UART, SPI | UART, SPI | UART, SPI | UART, SPI |
| Generation | WSSFM10 family (recent) | WSSFM10 family (recent) | WSSFM11 family (newer) | WSSFM10 P-gen (legacy) |
| Pin Count | 31 | 31 | 31 | 31 |
Key Differentiators
- Sigfox RC4 zone pre-certification for Latin America and parts of Asia-Pacific (vs WSSFM10R2AT)
- Single-zone focus on RC4 with same 13x20 mm 31-pin footprint as RC2 cousin (vs WSSFM11R2DAT (dual-zone))
- Newer-generation 13x20 mm platform versus the legacy WSSFM10P envelope (vs WSSFM10P)
Design Notes
The WSSFM10R4AT integrates an S2-LP transceiver and a STM32 MCU with a pre-tuned antenna area inside the 13x20 mm SMD footprint. When laying out the host PCB, keep the keep-out area under the module antenna free of copper pour, traces, and ground fill. Place the module at the edge of the host board (or in a cut-out) so the antenna radiates into free air instead of into the PCB substrate. The Sigfox RC4 link budget is sensitive to detuning; mismatched placement can degrade link margin by 5-10 dB and break outdoor coverage.
Do not assume the WSSFM10R4AT and WSSFM10R2AT are interchangeable - they are RC4 and RC2 region-specific, respectively, and the Sigfox operator will reject mismatched zone modules. Similarly, the WSSFM11R2DAT is a newer dual-zone variant on the same footprint but with different RF tuning that may slightly shift the antenna match. Always verify the Wisol/Seong Ji module variant label before firmware flashing, since flashing an RC4 image onto an RC2 module will silently fail certification.
The 31-pin land pattern requires a reflow profile compatible with JEDEC J-STD-020 MSL-3 ratings. Bake the tape-and-reel reels per the manufacturer's moisture sensitivity label before SMT assembly. Use a no-clean lead-free SAC305 paste, and avoid hand soldering the S2-LP and STM32 dies; rework must be done with hot-air tools and a thermal profile that protects the integrated shielding can. Confirm solder joint quality with X-ray inspection after reflow to verify the LGA-style pads underneath the module are fully wetted.
Use a low-dropout regulator or DC-DC buck with at least 100 mA peak headroom for the module's TX bursts. Add bulk decoupling (10 uF ceramic + 100 nF) within 5 mm of the module supply pin to absorb the TX current spikes. For battery-powered deployments, place a Schottky diode at the battery output to protect against reverse-current when the rail is fed from USB during programming. Measure the module's actual sleep current before locking in the battery lifetime model - Sigfox modules with default firmware often leave the internal LDO enabled and consume more quiescent current than the headline spec.
Compliance Information
RoHS compliant per JLCPCB part listing. AEC-Q100 is not applicable since this is an RF module, not an automotive-grade IC. REACH, halogen-free, and conflict-minerals status not stated in available datasheet excerpts.
