SI2493-D-FS - 56 kbps V.92 ISOmodem | Skyworks Solutions
MPN: SI2493-D-FS ✓ ActiveSI2493-D-FS Overview
An ISOmodem is a modem controller and data-access arrangement integrated into one semiconductor. In this architecture, the controller processes modulation protocols and line-interface functions while the data access arrangement connects the modem to the telephone network. ISOmodems are used when a system needs legacy PSTN connectivity in a compact, integrated implementation rather than a collection of separate modem, codec, and interface circuits.
The SI2493-D-FS supports ITU-T V.21, V.22, V.23, V.29, V.32, V.34, V.90, and V.92 data formats. Its data set also includes Bell 103 and Bell 212A formats, V.44 compression with V.42, V.42bis, and MNP2-5 support, automatic rate negotiation, PCM upstream operation, and V.92 quick connect. The combination of V.92 data rates and quick-connect functionality targets systems requiring faster modem call establishment over analog telephone lines.
The device uses a complete modem architecture for full-duplex PSTN operation, with conventional data formats supported through 56,000 bps. This makes it suitable for embedded data collection, remote equipment access, point-of-sale terminals, and industrial controllers that must communicate with legacy analog telephone infrastructure. The integrated global DAA reduces the number of discrete telephone-interface components required in a conventional modem design.
The SI2493-D-FS is specified in a 16-pin SOIC package for surface-mount assembly. Circuit implementation requires attention to the telephone-line interface, isolation requirements, analog signal routing, and the power connections defined by the manufacturer datasheet. Use the published reference design and pin-description table when assigning PCB nets because analog telephone nodes must not be routed like ordinary digital signals.
This page organizes the SI2493-D-FS protocol capabilities, package details, application guidance, and practical design considerations for engineers evaluating legacy PSTN connectivity. It also distinguishes documented device attributes from parameters that require confirmation from the full manufacturer datasheet before schematic release or production qualification.
Drop-in alternatives for SI2493-D-FS — 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 SI2493-D-FS (same form factor and footprint) — differing in Maximum Data Rate.
No drop-in alternatives available for this product.
Request AlternativesSI2493-D-FS Specifications
| Device Type | System-side V.92 ISOmodem with global DAA |
| Maximum Data Rate | 56,000 bps |
| Line Interface | Full-duplex over Public Switched Telephone Network (PSTN) |
| Primary Standard | ITU-T V.92 |
| Supported ITU-T Formats | V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92 |
| Supported Bell Formats | Bell 103, Bell 212A |
| Error Correction | V.42, V.42bis |
| Compression | V.44 |
| Data Compatibility | MNP2-5 |
| Rate Control | Automatic rate negotiation |
| Upstream Mode | PCM upstream |
| Call Establishment | V.92 quick connect |
| Package | 16-pin SOIC |
| Package Code | SOP |
| Terminal Form | Gull wing |
| Mounting Type | Surface mount |
| Temperature Grade | Commercial |
| Integrated Functions | Modem controller with global data access arrangement (DAA) |
SI2493-D-FS sop Pin Configuration Guide
Pin configuration for SI2493-D-FS (sop package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for SI2493-D-FS.
Refer to the datasheet for full pin configuration.
Typical Applications
SI2493-D-FS is suitable for 6 applications: Remote Industrial Terminal Access, Legacy Data Collection Equipment, Embedded Point-of-Sale Terminals, Remote Monitoring and Telemetry, Telephone-Based Equipment Maintenance, Backup Communication for Embedded Systems.
Remote Industrial Terminal Access
The SI2493-D-FS fits remote industrial terminals that must maintain service access over analog telephone lines. Its support for up to 56,000 bps, automatic rate negotiation, and V.92 quick connect provides a practical balance between connection speed and call-establishment overhead for maintenance sessions. The integrated global DAA simplifies the telephone-side architecture compared with a discrete modem implementation. Designers should use the manufacturer reference circuit for isolation, line termination, and power routing, and should verify that the deployed PSTN service supports the required V.92 mode.
Legacy Data Collection Equipment
The SI2493-D-FS is appropriate for data-collection equipment that connects to legacy remote meters, terminals, or management systems over PSTN. Support for V.21, V.22, V.23, V.29, V.32, V.34, V.90, and V.92 provides compatibility across a broad range of analog modem endpoints, while Bell 103 and Bell 212A formats broaden legacy interoperability. Automatic rate negotiation allows the system to adapt to line quality. Firmware must still implement the required authentication, retry, and data-integrity procedures expected by the remote equipment.
Embedded Point-of-Sale Terminals
Point-of-sale terminals operating where only analog telephone connectivity is available can use the SI2493-D-FS for host communications. V.92 quick connect is valuable for short transaction windows because it reduces connection-establishment overhead, while the 56,000 bps maximum rate accommodates moderate transaction payloads. The device's 16-pin SOIC package supports compact surface-mount assembly, but the telephone network section still requires careful layout and the appropriate regulatory isolation arrangement. Validate the complete transaction flow against the actual PSTN provider before production deployment.
Remote Monitoring and Telemetry
The SI2493-D-FS supports legacy remote monitoring equipment that must deliver alarms, status reports, and configuration data over analog telephone lines. Its broad protocol set allows interoperability with older endpoints, and V.92 quick connect can improve response time for short operator queries. The modem's compression and error-control functions are documented as V.44, V.42, and V.42bis, enabling the host software to select appropriate transfer characteristics. Application software should include timeouts and fallback modes because negotiated throughput depends on both endpoints and line conditions.
Telephone-Based Equipment Maintenance
Maintenance controllers that access field equipment over PSTN can use the SI2493-D-FS as an integrated system-side modem. Automatic rate negotiation lets the modem adapt to available line quality, and the common ITU-T and Bell formats increase the chance of compatibility with installed equipment. The 56,000 bps ceiling is sufficient for diagnostic logs, parameter uploads, and firmware transfer when line quality permits it. Security should be implemented at the application layer, including authentication and encrypted transport where the remote protocol permits it.
Backup Communication for Embedded Systems
The SI2493-D-FS can serve as a backup communications path for embedded systems whose primary link is unavailable. Its integration of the modem controller and global DAA reduces the board area required for a dedicated analog modem circuit, while support for older formats allows fallback to lower-speed modes when a V.92 connection cannot be established. Designers should evaluate how the backup link affects power budget and enclosure space. Keep the modem enable strategy independent so that it does not prevent the primary communication channel from operating.
Engineering reference data for SI2493-D-FS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 16-pin SOIC |
| Brand | Skyworks Solutions, Inc. |
| Maximum Data Rate | 56,000 bps |
| Primary Modem Standard | ITU-T V.92 |
| Line Operation | Full-duplex PSTN |
| Data Access Arrangement | Integrated global DAA |
| Compression Support | V.44 |
| Error Control | V.42 and V.42bis |
| Quick Connect | Supported |
| Temperature Grade | Commercial |
Key Differentiators
- Complete V.92 modem with integrated global DAA (vs Discrete modem, codec, and telephone-interface implementation)
- Broad legacy format support in one controller (vs Modems limited to a single high-speed ITU mode)
- Faster connection establishment for short transactions (vs V.32-class connection establishment without V.92 quick connect)
Design Notes
Treat the telephone-network section as an analog, isolation-sensitive circuit rather than as a conventional digital interface. Follow the manufacturer reference layout for the global DAA, protection components, isolation boundary, and telephone-line connections. Keep high-current and switching paths away from modem signal nodes, and confirm the creepage, clearance, and isolation requirements applicable to the deployment country before releasing the PCB.
Use the supply rails, decoupling values, and sequencing requirements shown in the Si2493 data sheet. The 16-pin SOIC device may combine analog, digital, and telephone-interface functions, so a single supply rail should not be assumed without checking each named pin's requirement. Validate startup, reset, and modem-enable behavior across the complete power range and include the required bypass capacitors directly at the device supply pins.
Do not select a replacement solely because it advertises V.92 or 56 kbps. Confirm that its 16-pin SOIC footprint is pin-to-pin compatible, that supply and clock requirements match, and that the host interface and DAA architecture are equivalent. Also verify that required legacy formats, automatic rate negotiation, compression, and quick-connect behavior remain available. Confirm regional telephone-network approvals before substituting an alternative modem into a deployed product.
Compliance Information
The SI2493-D-FS is identified as a commercial-grade 16-pin SOIC modem. RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations should be confirmed against the current manufacturer product documentation or declaration of compliance.