SI2404-D-FS 56kbps ISOmodem IC | Skyworks | 16-SOIC
MPN： SI2404-D-FS ✓ 啟用中SI2404-D-FS 概覽
An ISOmodem is a modem controller integrated circuit designed for data communication over telephone, analog, or other limited-bandwidth connections. It combines modulation, data handling, call-control signaling, and line-interface functions into a compact device. A system-side ISOmodem normally works with a line-side counterpart, allowing the two devices to divide the functions required for a complete analog data modem connection.
The SI2404-D-FS supports the principal V-series and Bell modem formats identified in the manufacturer documentation, including V.21, V.22, V.23, V.29, Bell 103, and Bell 212A. Related family documentation also identifies V.44, V.42, V.42bis, MNP2-5, automatic rate negotiation, Fast Connect, and Type I and Type II caller-ID decoding. These capabilities make the family applicable to legacy data equipment, embedded communication modules, fax systems, and industrial interfaces requiring standards-compatible modem signaling.
As a 2.4 kbps system-side modem IC, the SI2404-D-FS emphasizes compact implementation and compatibility with established modem protocols. Its 16-pin SOIC package provides a small surface-mount footprint, while the protocol mix allows operation with older terminals, fax machines, remote-management equipment, and telephone-network interfaces. The maximum 56,000 bps family capability depends on the selected line-side companion and does not mean that every operating mode of the SI2404-D-FS itself runs at that rate.
Typical implementations include embedded analog modems, fax-modem modules, industrial remote terminals, point-of-sale equipment, telecommunications test equipment, and legacy data-collection systems. In each application, the correct line-side IC, isolation boundary, analog termination, and network interface must be selected together because the SI2404-D-FS represents the system-side portion of the modem chipset.
When laying out the PCB, place the SI2404-D-FS close to the companion modem and analog-network interface components. Follow the manufacturer pin-description table for supply, ground, clock, control, and analog connections, and preserve the specified decoupling arrangement. Component population and timing values should be selected from the SI2404 family documentation rather than estimated from unrelated modem designs.
This page combines protocol identification, package and rate details, drop-in comparison guidance, and practical integration notes to accelerate component selection. Review the complete SI2404 family datasheet and your system-level modem requirements before releasing a production design.
直接替換替代品，適用於 SI2404-D-FS — 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-FS （相同外形與佔位） — 差異在於 Package, Product Type.
SI2404-D-FSR
✅ 直接替換📋 參考替代品（不在目錄中）
SI2401-FSR
✅ 直接替換聯絡詢價
查看資料表 →SI2404-D-FS 規格
| Product Type | System-side ISOmodem data communications IC |
| Manufacturer | Skyworks Solutions |
| Base Data Rate | 2,400 bps |
| Maximum Family Data Rate | 56,000 bps with the appropriate line-side companion device |
| Supported Modem Formats | V.21, V.22, V.23, V.29, Bell 103, Bell 212A |
| Related Family Modem Formats | ITU-T and Bell formats, V.44, V.42, V.42bis, MNP2-5 |
| Rate Negotiation | Automatic rate negotiation |
| Fast Connect | Supported by the SI2404/34/15/04 family documentation |
| Caller ID | Type I and Type II decode |
| 封裝 | 16-pin SOIC |
| 安裝類型 | Surface mount |
| Product Category | Network controller and processor IC / ISOModem |
SI2404-D-FS 16-pin soic 腳位配置指南
SI2404-D-FS（16-pin soic 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-FS.
請參閱 資料表 以查看完整腳位配置。
典型應用
SI2404-D-FS 適用於 6 應用s: Legacy Analog Data Modems, Industrial Remote Terminals, Fax and Multifunction Terminals, Point-of-Sale Communications, Telecommunications Test Equipment, Legacy Data Collection Systems.
Legacy Analog Data Modems
The SI2404-D-FS fits system-side modem designs that require established V.21, V.22, V.23, V.29, Bell 103, or Bell 212A operation. Its 2,400 bps base rate and 16-pin SOIC package support compact implementations built around the SI2404 chipset. The system can use the related family capabilities of automatic rate negotiation, Fast Connect, and caller-ID decoding when required, although the selected line-side companion determines the highest available operating rate.
推薦
Industrial Remote Terminals
Industrial terminals that communicate through older telephone-network services can use the SI2404-D-FS for standardized modem signaling. The device provides 2,400 bps operation across several V-series and Bell formats in a surface-mount 16-pin SOIC. A complete industrial design must add the appropriate line-side companion, analog termination, isolation, surge protection, and product-specific environmental controls. The modem IC supports interoperability but does not provide the complete protection network.
推薦
Fax and Multifunction Terminals
The SI2404-D-FS is appropriate for legacy fax and multifunction-terminal interfaces that require Bell and ITU modem compatibility. Support for V.21, V.22, V.23, V.29, Bell 103, and Bell 212A gives designers a defined protocol set for older equipment. Its 16-pin SOIC footprint helps reduce board area, while the separate system-side and line-side architecture allows each modem function to be integrated according to the product's line-interface requirements.
推薦
Point-of-Sale Communications
Point-of-sale terminals that must connect with established terminal equipment can use the SI2404-D-FS for 2,400 bps modem operation. The supported V.21, V.22, V.23, V.29, Bell 103, and Bell 212A formats provide compatibility options for legacy communication infrastructure. The 16-pin SOIC package supports surface-mount assembly, but the complete board still requires the matching line-side device, network coupling components, and a controlled power-supply design.
推薦
Telecommunications Test Equipment
The SI2404-D-FS can support test equipment that emulates or communicates with established modem standards. Its 2,400 bps operating class and support for both V-series and Bell formats make it suitable for interoperability, line-interface, and signaling investigations. The related family documentation also identifies automatic rate negotiation, Fast Connect, and Type I and Type II caller-ID decoding, which can be valuable in protocol and equipment test scenarios.
推薦
Legacy Data Collection Systems
Data-collection terminals designed around older telephone-network services can use the SI2404-D-FS as the system-side modem controller. Multiple modem formats and a 2,400 bps base rate support established terminal ecosystems, while the 16-pin SOIC package permits compact retrofit assemblies. Engineers should verify the line-side companion, caller-ID behavior, clock requirements, and analog-network interface against the exact Revision D family documentation before layout release.
推薦
工程參考資料，適用於 SI2404-D-FS — 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-FSR | SI2401-FSR |
|---|---|---|---|
| Package | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC |
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
主要差異化特點
- Direct match to established V-series and Bell modem requirements (對比SI2401-FSR)
- Same-family alternative with the same named rate and package (對比SI2404-D-FSR)
- Broader documented family feature set (對比SI2401-FSR)
- Established system-side positioning for legacy modem equipment (對比SI2404-D-FSR)
設計說明
Place the SI2404-D-FS close to the selected line-side companion and analog-network interface to minimize sensitive-node routing and reduce susceptibility to noise pickup. Follow the Revision D manufacturer pin-description table for power, ground, clock, control, and analog assignments. Do not derive the PCB footprint only from the 16-pin SOIC name; verify land dimensions, pad length, and pin-1 orientation against the package drawing.
Separate modem clock and sensitive analog connections from switching supplies and high-current peripherals. Use the manufacturer-recommended grounding and decoupling arrangement, and route analog-network and isolation-boundary components according to the reference circuit. Estimated: no board-level impedance or noise budget can be assigned without the line-side device, clock source, isolation method, and physical layout, so validate these parameters on the final assembly.
Do not assume that the 56,000 bps family capability is available unconditionally. The SI2404-D-FS is identified at 2,400 bps, and the highest family rate depends on the selected line-side companion device. A replacement also requires verification of modem formats, clocking, firmware, pin functions, and companion-chipset compatibility rather than package and headline-rate matching alone.
Design the supply rails from the exact operating-voltage and current limits in the manufacturer datasheet, then include margin for the attached line-side modem and analog circuitry. Keep regulator switching nodes and magnetics away from clock and analog nodes, and provide local bypass capacitance at the device supply pins as specified by the family reference design. Supply sequencing must also prevent powered modem stages from back-feeding an unpowered SI2404-D-FS.
合規資訊
No definitive environmental or automotive qualification declaration was identified for the exact SI2404-D-FS ordering code. Confirm RoHS, REACH, AEC-Q100, terminal-finish, and conflict-mineral status with Skyworks before production release.