SI2404-D-FT - 2.4 kbps ISOmodem IC | Skyworks Solutions
MPN： SI2404-D-FT ✓ 啟用中SI2404-D-FT 概覽
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.
直接替換替代品，適用於 SI2404-D-FT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SI2404-D-FT （相同外形與佔位） — 差異在於 Product Type, Package Type.
SI2404-D-GT
✅ 直接替換聯絡詢價
SI2404-D-FS
✅ 直接替換聯絡詢價
查看資料表 →SI2404-C-FT
✅ 直接替換聯絡詢價
SI2415-FT
✅ 直接替換📋 參考替代品（不在目錄中）
SI2404-D-IS
✅ 直接替換📋 參考替代品（不在目錄中）
SI2404-D-FT 規格
| 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 |
| 供應電壓 | 3.3 V |
| Wake-Up Function | Supported |
| 腳位數 | 24 pins |
| Package Type | TSSOP-24 |
| Package Pitch | 0.65 mm |
| Package Height | 1.2 mm maximum |
| Package Span | 7.8 mm |
| 安裝類型 | Surface mount |
| 工作溫度 | 0°C to 70°C |
| RoHS 狀態 | Compliant |
| Tariff Code | 8542.39.00.01 |
SI2404-D-FT 7.8 mm 腳位配置指南
SI2404-D-FT（7.8 mm 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： SI2404-D-FT.
請參閱 資料表 以查看完整腳位配置。
典型應用
SI2404-D-FT 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 SI2404-D-FT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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) |
主要差異化特點
- Broad legacy modem-standard support (對比SI2404-D-FS)
- Matched 24-pin TSSOP integration (對比SI2404-D-GT)
- Flexible embedded host connectivity (對比SI2415-FT)
設計說明
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.
合規資訊
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.
