SI2404-D-FT - 2.4 kbps ISOmodem IC | Skyworks Solutions
料号： SI2404-D-FT ✓ 量产中SI2404-D-FT 概述
An ISOmodem is a dedicated integrated-circuit implementation of the signaling and data functions historically handled by a complete analog modem. The system-side position of the SI2404-D-FT means it works with a complementary line-side or host interface arrangement. This device belongs to the broader modem IC, network controller and processor, interface IC, and semiconductor product hierarchy.
The SI2404-D-FT combines a maximum 2.4 kbps data rate with support for several ITU-T and Bell modem standards. Its SPI and UART interfaces allow a host processor to configure the modem and exchange framed data. A 4.92 MHz operating frequency, 3.3 V supply, and wake-up function are also identified for this device, making it suitable for embedded systems that need controlled low-power operation.
The 24-pin TSSOP package provides a surface-mount implementation suitable for compact communications equipment. Comparison information identifies a 0.65 mm pitch, a maximum body height of 1.2 mm, and a 7.8 mm overall span. Commercial temperature operation extends to 70°C, while RoHS compliance is reported for the matched TSSOP-24 comparison.
Typical uses include embedded fax and data terminal equipment, caller-ID reception, point-to-point serial links, industrial telemetry, and legacy telephone-network equipment. Supporting multiple modem standards allows one hardware platform to interoperate with endpoints using V.21, V.22, V.23, V.29, Bell 103, or Bell 212A signaling rather than limiting operation to one protocol.
Designers should confirm the required line-side and system-side circuit arrangement, external interface timing, crystal or clock requirements, and termination values against the manufacturer datasheet before layout. The SPI and UART signals should be routed away from sensitive telephone-line inputs, with grounding and return paths arranged to reduce coupling between the modem and host interfaces.
This page organizes the SI2404-D-FT specifications, practical application context, compatibility comparisons, and design guidance to help engineers evaluate this 2.4 kbps modem IC before integrating it into a communications system.
直接替换替代料： SI2404-D-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： SI2404-D-FT （相同外形与封装尺寸） ——差异在于 Product Type, Package Type.
SI2404-D-GT
✅ 直接替换联系询价
SI2404-D-FS
✅ 直接替换联系询价
查看数据手册 →SI2404-C-FT
✅ 直接替换联系询价
SI2415-FT
✅ 直接替换📋 参考替代料（不在目录中）
SI2404-D-IS
✅ 直接替换📋 参考替代料（不在目录中）
SI2404-D-FT 规格参数
| Product Type | 2.4 kbps ISOmodem system-side IC |
| Maximum Data Rate | 2.4 kbps |
| Supported Modem Standards | V.21, V.22, V.23, V.29, Bell 103, Bell 212A |
| Host Interface | SPI and UART |
| Operating Frequency | 4.92 MHz |
| 电源电压 | 3.3 V |
| Wake-Up Function | Supported |
| 引脚数量 | 24 pins |
| Package Type | TSSOP-24 |
| Package Pitch | 0.65 mm |
| Package Height | 1.2 mm maximum |
| Package Span | 7.8 mm |
| 安装类型 | Surface mount |
| 工作温度 | 0°C to 70°C |
| RoHS 状态 | Compliant |
| Tariff Code | 8542.39.00.01 |
SI2404-D-FT 7.8 mm 引脚配置指南
SI2404-D-FT（7.8 mm 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： SI2404-D-FT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI2404-D-FT 适用于 6 应用s: Legacy Data Terminal Equipment, Embedded Fax and Facsimile Interfaces, Caller-ID and Telephone Signaling Equipment, Industrial Telemetry Links, Point-to-Point Serial Communications, Legacy Network Adapter Equipment.
Legacy Data Terminal Equipment
The SI2404-D-FT fits embedded data terminals that communicate at up to 2.4 kbps with legacy remote equipment. Its support for V.21, V.22, V.23, V.29, Bell 103, and Bell 212A provides protocol flexibility across common ITU-T and Bell modem families. The host controller can use SPI or UART, allowing the modem function to be added without relying on a separate plug-in modem. During implementation, confirm the exact modulation, timing, and electrical interface requirements against the manufacturer reference circuit.
推荐
Embedded Fax and Facsimile Interfaces
The SI2404-D-FT is applicable to legacy facsimile and multifunction equipment that needs a system-side modem interface supporting established 2.4 kbps signaling modes. V.21, V.22, V.23, and V.29 support gives the host equipment several negotiation paths when connecting with older fax endpoints. SPI and UART host connectivity simplifies integration with an embedded processor. Board-level implementation must follow the manufacturer’s isolation, line-coupling, grounding, and interface layouts to preserve signal integrity.
推荐
Caller-ID and Telephone Signaling Equipment
The SI2404-D-FT can be incorporated into telephone-network equipment that combines legacy modem signaling with auxiliary line information functions. Its Bell 103 and Bell 212A support broadens compatibility with endpoints using Bell-family formats, while the 2.4 kbps modem capability handles low-speed data channels. The wake-up function may assist systems that must reduce activity between communication sessions. Exact caller-ID decoding behavior and line-side circuitry should be verified in the SI2404 family documentation.
推荐
Industrial Telemetry Links
The SI2404-D-FT supports industrial telemetry equipment designed to exchange low-speed data with remote legacy stations. The combination of a 2.4 kbps rate, several modem standards, and a host-accessible SPI or UART interface supports controlled embedded connectivity. Wake-up capability can complement power-management strategies, although the commercial temperature specification of 70°C should be checked against the enclosure environment. Use the manufacturer layout guidance to isolate modem signals from sensitive sensor and power circuitry.
推荐
Point-to-Point Serial Communications
The SI2404-D-FT is useful in point-to-point serial links where both endpoints support one of its documented modem formats. V.21, V.22, and V.23 support can accommodate lower-rate links, while V.29 and Bell 212A options broaden interoperability with legacy equipment. The SPI interface suits processor-driven control, and the UART interface offers a straightforward host connection. Validate line termination, clocking, electrical levels, and software timing before deploying the modem in a new serial-network design.
推荐
Legacy Network Adapter Equipment
The SI2404-D-FT can serve as the modem element in compact legacy network adapters intended for serial or telephone-line connectivity. Its multi-standard support lets one design address equipment using V.21, V.22, V.23, V.29, Bell 103, or Bell 212A, while SPI and UART simplify connection to different embedded host architectures. The 24-pin TSSOP supports compact surface-mount construction. Before release, confirm the required standard, fallback behavior, thermal margin, and exact package footprint on the assembled board.
推荐
推荐产品汇总
工程参考数据： SI2404-D-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 | SI2404-D-GT | SI2404-D-FS | SI2415-FT | SI2404-D-IS |
|---|---|---|---|---|---|
| Brand | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Energy Micro (Silicon Labs) |
关键差异点
- Broad legacy modem-standard support （对比 SI2404-D-FS)
- Matched 24-pin TSSOP integration （对比 SI2404-D-GT)
- Flexible embedded host connectivity （对比 SI2415-FT)
设计说明
Follow the manufacturer reference layout when placing the SI2404-D-FT and its external components. Keep SPI and UART routing away from telephone-line or analog modem nodes, use short ground returns, and avoid routing communications traces beneath isolation or high-energy interface sections. The 24-pin TSSOP has a 0.65 mm pitch, so inspect the assembled board under magnification to verify solder joints and avoid solder bridging between fine-pitch pads.
Treat clock, supply, and modem-interface traces as related but distinct nets. The device operates at 4.92 MHz and accepts a 3.3 V supply, so decouple the supply locally and provide a continuous return path beneath signal routes. Confirm trace impedance, grounding, and component placement against the manufacturer reference circuit; the SI2404 family spans several modem standards, making repeatable physical implementation important.
The SI2404-D-FT has a documented 3.3 V operating supply, but the supply-current requirement is not established on the product listing. Do not size the rail from a generic modem value. Use the manufacturer datasheet for operating, sleep, and wake-up current, then verify that the upstream regulator has adequate margin for the selected modem standard and host activity. Place required input capacitance at the device pins according to the reference layout.
A matching TSSOP-24 footprint alone does not prove that two modem options are interchangeable. Before substituting SI2404-D-GT, SI2404-D-FS, SI2404-C-FT, SI2415-FT, or SI2404-D-IS, compare pin names, supply levels, clock requirements, interface polarity, and the exact set of supported modem standards. Also confirm lifecycle and sourcing status, since a mechanically compatible package can still contain protocol or option-specific differences.
合规信息
RoHS compliance is identified in the matched TSSOP-24 comparison. No explicit REACH, halogen-free, conflict-minerals, or AEC-Q100 status is identified for the exact device.
