SI2404-C-FS - 2.4 kbps ISOmodem | Skyworks Solutions | SOIC-16
Référence : SI2404-C-FS ✓ ActifSI2404-C-FS Présentation
An ISOmodem is a dedicated integrated modem-circuit device used to encode and decode analog telephone-line signals into digital data. Within the product hierarchy, the SI2404-C-FS belongs to the modem IC family, which falls under network controller and processor interface ICs. Its 2.4 kbps signaling rate is intended for low-speed data communication, remote control, alarm reporting, telemetry, and point-to-point equipment links rather than modern broadband access.
The device supports V.21, V.22, V.23, V.29, Bell 103, and Bell 212A formats, allowing it to interoperate with compatible telephone-network equipment. Its 2.4 kbps rate and 4.92 MHz operating frequency are fixed operating characteristics rather than adjustable high-speed interfaces. SPI and UART connections give an embedded controller access to modem status and configuration functions without requiring a separate host interface circuit.
The SI2404-C-FS is offered in a 16-pin SOIC package measuring approximately 3.90 mm in body width. Tube packaging and a lead-free, RoHS-compliant construction support conventional surface-mount assembly and regulated production workflows. Because it is a line-side signaling and modem-interface device, its implementation depends on the surrounding ISOmodem chipset, isolation network, telephone-line interface, clocking, and host firmware.
Typical uses include industrial telemetry terminals, security equipment, remote monitoring controllers, telephone-line data bridges, and legacy equipment interfaces. SPI control suits embedded processors with dedicated serial peripherals, while UART can simplify connections to microcontrollers or modules that lack SPI. At 2.4 kbps, application data rates must be sized around the modem protocol overhead and telephone-line conditions.
Use the manufacturer datasheet pin-description table when assigning PCB tracks, and confirm clock, interface levels, and line-side circuit requirements before layout. Component values around the analog interface are sensitive to grounding, supply return paths, and layout symmetry, so follow the recommended application circuit and component-selection guidance rather than substituting values generically.
This page organizes the SI2404-C-FS protocol capabilities, package information, sourcing details, application guidance, and replacement considerations into one engineering-focused reference. It also separates confirmed product attributes from parameters that require direct confirmation in the manufacturer datasheet before a new design is released for production.
Alternatives de remplacement direct pour SI2404-C-FS — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesSI2404-C-FS Spécifications
| Product Type | ISOmodem system-side modem IC |
| Débit de données | 2.4 kbps |
| Operating Frequency | 4.92 MHz |
| Supported Data Formats | V.21, V.22, V.23, V.29, Bell 103, Bell 212A |
| Host Interface | SPI and UART |
| Tension d'alimentation de fonctionnement | 3.3 V |
| Package Type | 16-pin SOIC |
| Package Body Width | 3.90 mm |
| Packaging | Tube |
| Type de montage | Surface mount |
| Lead-Free Status | Lead free |
| Statut RoHS | RoHS compliant |
| Automotive Qualification | No |
| AEC-Q100 Qualification | No |
Guide de configuration des broches du SI2404-C-FS 3.90 mm
Configuration des broches du SI2404-C-FS (boîtier 3.90 mm). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour SI2404-C-FS.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
SI2404-C-FS convient pour 6 applications: Industrial Telephone-Line Telemetry, Remote Monitoring and Alarm Reporting, Security and Surveillance Equipment, Legacy Equipment Data Bridge, Point-to-Point Telemetry Terminal, Microcontroller-Based Communications Controller.
Industrial Telephone-Line Telemetry
The SI2404-C-FS fits low-speed industrial telemetry equipment that must exchange measurements, alarms, or configuration data through a telephone-line modem chipset. Its 2.4 kbps operation supports compact periodic reports, while SPI provides a deterministic connection to a suitable embedded processor and UART offers an alternative for simpler controllers. A practical design uses the SI2404-C-FS with the required line-side network, clock circuitry, isolation components, and chipset, while limiting message size to account for protocol overhead and variable telephone-line quality.
Remote Monitoring and Alarm Reporting
The SI2404-C-FS is applicable to remote monitoring equipment that reports alarms through a telephone network instead of a continuously connected digital link. Its supported V.21, V.22, V.23, V.29, Bell 103, and Bell 212A formats provide several modem signaling choices, and the 3.3 V supply simplifies integration with modern embedded systems. The host processor can use SPI or UART to exchange commands and status. Firmware should include call establishment, timeout, retry, and line-failure handling because a 2.4 kbps modem link is affected by network conditions.
Security and Surveillance Equipment
The SI2404-C-FS can support telephone-line data functions in security installations that need backup command or event reporting. A 2.4 kbps channel is sufficient for concise status messages, configuration commands, and identification records, but it is not intended for continuous video transport. The 16-pin SOIC package supports compact board layouts, and the 3.3 V operating supply can share infrastructure with a security controller. Designers should follow the manufacturer reference circuit for isolation, grounding, and line-side coupling because incorrect telephone-network isolation can create safety and signal-integrity problems.
Legacy Equipment Data Bridge
The SI2404-C-FS is useful when an embedded controller must communicate with legacy telephone-network equipment through a standard modem chipset. The device supports several established modem formats, including Bell 103 and Bell 212A, making it relevant to systems designed around V.21, V.22, V.23, or V.29 operation. SPI and UART host interfaces reduce the burden of driving modem commands directly. Firmware must implement the required timing and handshake behavior, and engineers should verify electrical levels and pin assignments against the manufacturer datasheet before retrofitting the circuit.
Point-to-Point Telemetry Terminal
The SI2404-C-FS suits compact point-to-point telemetry terminals where each endpoint communicates over a telephone line at low data rate. Its 2.4 kbps signaling capability and 4.92 MHz operating frequency are suitable for short status packets, configuration exchange, and periodic sensor readings rather than file transfers. The interface can be managed through SPI or UART according to processor capability. Because link throughput is limited, application data should be compressed or summarized before transmission, and the design should include modem-status monitoring to distinguish a disconnected line from a powered terminal.
Microcontroller-Based Communications Controller
The SI2404-C-FS can serve as the communications engine in a microcontroller-based controller that needs modem behavior over a telephone line. A microcontroller using SPI receives deterministic access to modem status and control functions, while a UART-only controller can use the alternate serial path. The 3.3 V operating supply and 16-pin SOIC package facilitate compact assembly, although exact logic thresholds and timing must be confirmed before PCB design. The implementation should separate the digital host circuitry from the analog line-side network and follow the manufacturer’s recommended grounding and decoupling arrangement.
Données de référence d'ingénierie pour SI2404-C-FS — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Package | 16-pin SOIC |
| Brand | Skyworks Solutions |
| Data Rate | 2.4 kbps |
| Operating Frequency | 4.92 MHz |
| Operating Supply Voltage | 3.3 V |
| Host Interface | SPI and UART |
| Supported Data Formats | V.21, V.22, V.23, V.29, Bell 103, Bell 212A |
| Packaging | Tube |
| RoHS Status | RoHS compliant |
| Automotive Qualification | No |
Principaux différenciateurs
- Compact 16-pin SOIC implementation (vs SI2404-C-FT)
- Multiple established modem formats (vs SI2404-C-FT)
- Dual host-interface options (vs SI2404-C-FT)
Notes de conception
Assign the PCB footprint only after checking the SI2404-C-FS manufacturer package drawing, including body width, lead span, pitch, and seating-plane tolerances. The product information identifies a 16-pin SOIC package with an approximately 3.90 mm body width. Place input and output decoupling close to their associated pins, preserve a continuous ground return, and keep the digital host traces away from the line-side analog network to reduce coupling into the modem signal path.
Keep the SPI and UART routes short, use controlled-impedance routing where appropriate, and provide a quiet ground reference beneath digital interface activity. The SI2404-C-FS operates at 4.92 MHz, so the clock path and nearby circuitry require deliberate layout. Follow the manufacturer application circuit for clock and line-side component placement; avoid long parallel runs between the modem interface and sensitive analog nodes, which can increase capacitive coupling and intermittent communication errors.
Do not treat the SI2404-C-FSR, SI2404-C-GTR, or SI2404-C-FT identifiers as interchangeable without checking the exact package, pinout, electrical limits, and ordering suffix. The SI2404-C-FT uses a 24-pin TSSOP rather than the SI2404-C-FS 16-pin SOIC. A valid replacement must also preserve the 3.3 V operating condition, SPI/UART behavior, clocking arrangement, and modem-control functions; matching only the SI2404 family name is insufficient.
Informations de conformité
RoHS-compliant and lead-free status are explicitly identified for SI2404-C-FS. The SI2404-C-FT comparison identifies no AEC-Q100 qualification, and the target is not listed as automotive qualified.