SI2493-C-FT 56 kbps ISOModem | Skyworks | 24-TSSOP
料号： SI2493-C-FT ✗ 停产SI2493-C-FT 概述
An ISOmodem is a mixed-signal communications IC that combines modem signal processing with a controller and host-side interface functions. Within the semiconductor hierarchy, it belongs to the modem and network-controller category, while also functioning as a transceiver for analog telephone-line signaling. Such devices provide a hardware interface between a host processor and a communications channel, reducing the amount of modem signal-processing software required in the host.
The SI2493-C-FT supports several ITU V-series and V.92-related data formats together with Bell 103 and Bell 212A modes. This multi-format capability makes it relevant to telephone-line data equipment, embedded data communication systems, and legacy access-device designs. Its stated 56 kbps operating rate places it in the low-speed modem class rather than broadband, Ethernet, or high-speed DSL transceiver categories.
The 24-TSSOP package provides a standardized surface-mount form factor with leads on both sides of the package. The SI2493-C-FT is identified with the -C-FT ordering suffix and is supplied in tube packaging according to the package information associated with the part. Because modem performance depends on the complete line interface, external circuitry, crystal requirements, isolation strategy and host configuration, designers should evaluate the device against the exact manufacturer datasheet and reference circuit rather than infer those details from the family name alone.
Typical uses include compact customer-premises equipment, telephone-line data controllers, embedded communication appliances and data-over-voice terminal equipment. In these systems, the IC can perform modulation and demodulation while the host manages the application, connection policy and user interface. The final system still requires careful separation of the analog line interface from sensitive digital circuitry.
For layout, place the modem and associated line-interface components according to the manufacturer reference design, with particular attention to analog ground, supply decoupling and copper return paths. Use controlled impedance routing for digital interfaces where applicable, and avoid introducing long loops around the telephone-line interface. Verify thermal performance, regulatory constraints and line-interface component ratings for the deployment region.
This page consolidates the SI2493-C-FT ordering information, supported data formats, package details, replacement guidance and engineering-selection considerations into a compact design reference. It also identifies the verified direct substitute and highlights which electrical and pin-level details must be confirmed in the manufacturer datasheet before a new layout or production release.
直接替换替代料： SI2493-C-FT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SI2493-C-FT （相同外形与封装尺寸） ——差异在于 Device Type.
SI2493-D-FT
✅ 直接替换联系询价
查看数据手册 →SI2493-C-FT 规格参数
| Device Type | System-side ISOmodem network controller and processor IC |
| Maximum Data Rate | 56 kbps |
| Supported Data Formats | V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92 |
| Supported Signaling Modes | Bell 103, Bell 212A |
| Package Type | 24-TSSOP |
| Package Width | 4.40 mm |
| Package Length | 0.173 in |
| 安装类型 | Surface mount |
| Packaging | Tube |
SI2493-C-FT 0.173 in 引脚配置指南
SI2493-C-FT（0.173 in 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： SI2493-C-FT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI2493-C-FT 适用于 6 应用s: Telephone-Line Data Terminals, Compact Customer-Premises Equipment, Embedded Data-Over-Voice Equipment, Legacy Network-Access Adapters, Industrial Communication Terminals, Communication Test Equipment.
Telephone-Line Data Terminals
The SI2493-C-FT fits low-speed telephone-line data terminals that require support for V.21 through V.34, V.90 and V.92 formats, along with Bell 103 and Bell 212A signaling. Its maximum 56 kbps modem rate and system-side ISOmodem architecture place it between a host processor and the analog line interface. A designer can use the modem functions for session establishment while the host manages the user interface and application data. The external telephone-line network still requires suitable protection, coupling, isolation and regulatory compliance. Final component values and timing should follow the manufacturer reference design because the published product information does not define the complete analog network interface.
推荐
Compact Customer-Premises Equipment
The SI2493-C-FT is appropriate for compact customer-premises equipment that connects a host processor to a telephone-grade data channel. Its system-side ISOmodem role allows modulation, demodulation and protocol-facing functions to be implemented in dedicated hardware rather than relying entirely on host software. The 24-TSSOP surface-mount package supports compact board layouts, while support for Bell 103 and Bell 212A broadens compatibility with legacy access equipment. Designers should reserve area for the recommended external line interface and verify thermal, isolation and network-approval requirements. Exact supply, clock and external-component values must be taken from the current manufacturer documentation.
推荐
Embedded Data-Over-Voice Equipment
The SI2493-C-FT can support embedded data-over-voice equipment where a product needs modem communication over an analog telephone channel. Its selection of V-series formats and a maximum rate of 56 kbps suits legacy low-bandwidth connectivity rather than modern broadband workloads. The modem IC handles the communications channel while an embedded host controls configuration and the application payload. Key engineering concerns include line-level protection, codec or analog-interface implementation, startup timing and immunity to line transients. Because the modem IC cannot substitute for the complete external line network, the reference circuit and component ratings must be validated for the intended deployment.
推荐
Legacy Network-Access Adapters
The SI2493-C-FT is suitable for legacy network-access adapters that must interoperate with V.21, V.22, V.23, V.29, V.32, V.34, V.90 or V.92 equipment. Supporting both V-series and Bell modes makes it useful in systems intended to bridge older communication standards through a modern host interface. The 56 kbps ceiling defines its role as a low-speed access device, while its system-side modem architecture allows the host processor to concentrate on control and data handling. For a new design, check protocol support and initialization differences against the SI2493-D-FT. For an existing board, verify every electrical limit and the recommended line-interface network before approving substitution.
推荐
Industrial Communication Terminals
The SI2493-C-FT can serve as the modem element in an industrial communication terminal designed for low-speed remote access over a telephone-grade line. Its support for multiple legacy formats offers flexibility when connecting to field equipment using established modem standards. The surface-mount 24-TSSOP package allows integration into compact embedded products, but an industrial implementation must add the protection, filtering and isolation required at the line interface. Review the manufacturer recommendation for supply filtering, reference clock and analog components, and validate operation across temperature and line-impulse conditions. Commercial availability should be confirmed for the production lifecycle before making the design decision.
推荐
Communication Test Equipment
The SI2493-C-FT can be evaluated for communication test equipment intended to exercise low-speed telephone-line modem behavior. Its broad set of V-series modes and Bell 103 and Bell 212A support provides multiple modulation formats for interoperability testing, while the 56 kbps rate is appropriate for legacy endpoint verification. The IC may be placed in an instrument designed to exercise modem control and data-path behavior rather than acting as a complete standalone tester. Accurate measurements require a controlled analog line interface, known reference clock and carefully terminated test paths. Use the SI2493-D-FT as a documented substitute candidate when its current electrical and initialization characteristics meet the instrument specification.
推荐
工程参考数据： SI2493-C-FT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SI2493-D-FT |
|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions |
| Package | 24-TSSOP | 24-TSSOP - consistent package and terminals |
| Device Function | System-side ISOmodem network controller and processor | Direct substitute modem chip with consistent terminals and package |
关键差异点
- Documented direct-substitute path （对比 SI2493-D-FT)
- Broad legacy modem-format support （对比 SI2493-D-FT)
- System-side ISOmodem integration （对比 SI2493-D-FT)
设计说明
Create the PCB footprint from the current 24-TSSOP package drawing rather than from the abbreviated 0.173 in by 4.40 mm description. Verify lead pitch, toe geometry, solder-mask clearance and copper keepouts. Position the modem according to the manufacturer layout example, keeping the analog line interface away from clocks, high-speed digital routes and switching-supply components. A mechanically similar package is not enough to establish pin compatibility.
Separate the telephone-line analog path from digital control and processor traces, and keep ground returns continuous beneath the modem and line-interface section. Use the manufacturer reference design to determine where analog and digital grounds meet and how bypass components connect. Keep clock routing short and isolated from sensitive modem nodes. After layout fabrication, verify return paths and isolation spacing because modem performance can be affected even when the schematic is correct.
Do not approve a SI2493-D-FT substitution solely because its package and terminals match. Compare input-voltage limits, absolute maximum ratings, clock frequency, startup behavior, supported signaling modes, line-interface recommendations and host-interface timing between the current datasheets. The suffix change may represent a functional or qualification change even when the PCB land pattern remains unchanged. Record the engineering comparison in the substitution approval.
Treat the telephone line as an electromagnetic-interference and surge entry point. Use the protection, isolation and filtering network specified by the manufacturer reference design, and keep protective devices close to the external connector. Verify common-mode voltage, pulse withstand and regulatory limits for the deployment region. ESD protection alone does not establish that the modem interface is safe for conducted telephone transients.
合规信息
Compliance statements for RoHS, REACH, lead-free status, halogen-free status and conflict minerals were not present in the verified product information. AEC-Q100 qualification is not indicated for this legacy modem IC, but it is not an automotive device.