SI2434-D-FS 33.6 kbps ISOMODEM | Skyworks Solutions
料号： SI2434-D-FS ✓ 量产中SI2434-D-FS 概述
An ISOMODEM is a highly integrated data access arrangement, or DAA, that combines modem signal processing with the analog telephone-line interface. This system-side device belongs to the modem IC category within the broader interface IC and data-communication equipment hierarchy. Integrating the system-side functions into one package reduces the number of external components required for a telephone-line modem or data terminal adapter.
The SI2434-D-FS supports 33.6 kbps operation and the listed V-series and Bell 103/212A modulation schemes. Its 16-SOIC surface-mount construction is suitable for compact communication equipment, while the 3 V to 3.6 V operating range suits modern low-voltage systems. The manufacturer describes the device as an ISOMODEM system-side component, pairing it with a compatible Skyworks line-side device in complete modem solutions.
Skyworks ISOmodem devices use the patented direct access arrangement technology to provide a programmable telephone-line interface with high integration. The SI2434 provides the system-side modem functions, while a companion line-side device handles the line-facing interface. This division allows a compact two-chip implementation instead of a discrete modem, line driver, and protection network.
Typical applications include asynchronous serial modems, remote-access systems, data terminal adapters, embedded telephone-line data equipment, and legacy data-communication links. The SI2434-D-FS is also appropriate for equipment that must interoperate with Bell 103 or Bell 212A systems while supporting the listed ITU V-series protocols.
The principal design consideration is that the SI2434 is only the system-side portion of the chipset. Board designers must select a compatible line-side device, implement the recommended external network interface, and follow the manufacturer's reference circuit for filtering, protection, termination, and layout. Check the line-side device supply requirements and signal-level compatibility before releasing a production schematic.
This page combines protocol coverage, package information, verified sourcing listings, drop-in same-family alternatives, and practical implementation guidance. It is intended to help engineers evaluate the SI2434-D-FS for legacy telephone-line modem upgrades, interface redesigns, and long-tail supply situations before requesting a quote.
直接替换替代料： SI2434-D-FS ——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： SI2434-D-FS （相同外形与封装尺寸） ——差异在于 Package, Maximum Data Rate, Product Type, Rate Negotiation, RoHS Status.
SI2434-C-FTR
✅ 直接替换📋 参考替代料（不在目录中）
SI2457-C-FT
✅ 直接替换联系询价
查看数据手册 →SI2415
✅ 直接替换📋 参考替代料（不在目录中）
SI2404-D-FS
✅ 直接替换联系询价
查看数据手册 →SI2434-D-FS 规格参数
| Product Type | ISOMODEM system-side interface IC |
| Maximum Data Rate | 33.6 kbps |
| Supported Modulation | V.21, V.22, V.23, V.29, V.32 |
| Bell Support | Bell 103 and Bell 212A |
| 电源电压 | 3 V to 3.6 V |
| 封装 | 16-SOIC, 0.154 in (3.90 mm) width |
| 安装类型 | Surface mount |
| 引脚数 | 16 pins |
| Telephone Line Architecture | Direct access arrangement (DAA) modem interface |
| Line-Side Companion | Si3018 or Si3010 family device |
| Lead-Free Status | Lead free |
| RoHS 状态 | RoHS compliant |
| Interface Standards | ITU-T V.21, V.22, V.23, V.29, V.32 and Bell 103, 212A |
SI2434-D-FS 16-soic, 0.154 in (3.90 mm) width 引脚配置指南
SI2434-D-FS（16-soic, 0.154 in (3.90 mm) width 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： SI2434-D-FS.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI2434-D-FS 适用于 6 应用s: Legacy Asynchronous Serial Modems, Data Terminal Adapters, Remote Access and Telemetry Equipment, Industrial Telephone-Line Control Links, Communications Adapter Retrofits, Point-of-Sale and Terminal Equipment.
Legacy Asynchronous Serial Modems
The SI2434-D-FS is appropriate for a compact asynchronous serial modem built around V.21, V.22, V.23, V.29, or V.32 signaling. Its 33.6 kbps system-side modem capability consolidates functions that otherwise require multiple interface components. A designer can pair the device with a Si3018 or Si3010 line-side IC, implement the manufacturer reference network, and support older remote-access terminals without adopting a much faster modern line modem.
推荐
Data Terminal Adapters
A data terminal adapter can use the SI2434-D-FS as its telephone-line modem engine when interoperability with Bell 103 or Bell 212A equipment is required. The device supports 33.6 kbps operation and the specified V-series protocols in a 16-SOIC package. Its high integration reduces the analog modem footprint, while the 3 V to 3.6 V operating range fits contemporary embedded control systems.
推荐
Remote Access and Telemetry Equipment
The SI2434-D-FS can support remote-access terminals, telemetry controllers, and equipment-maintenance links that communicate over a telephone line. Supporting V.22, V.23, V.29, and V.32 gives the design options for balancing throughput against line conditions. Because the SI2434 handles only the system-side functions, a compatible line-side device and properly protected network interface remain required for reliable field operation.
推荐
Industrial Telephone-Line Control Links
Industrial controllers can use the SI2434-D-FS to establish a low-speed control link over an analog telephone circuit. The Bell 103 and Bell 212A support is useful when communicating with legacy plant equipment, while V.29 and V.32 provide higher-rate options within the same modem architecture. The 16-SOIC format simplifies assembly, but surge protection, ring detection, and network isolation must be designed according to the application exposure.
推荐
Communications Adapter Retrofits
The SI2434-D-FS is useful when replacing a discrete or older modem subsystem in communications equipment that must retain Bell 103 or V-series interoperability. Its system-side ISOMODEM function consolidates modem processing into a single 16-SOIC device, while the companion line-side IC retains the line-facing circuitry. Before retrofitting, confirm signal levels, clocking, protocol firmware, and the physical dimensions of the existing analog interface.
推荐
Point-of-Sale and Terminal Equipment
Point-of-sale terminals and payment peripherals that communicate with older back-office systems can use the SI2434-D-FS for 33.6 kbps telephone-line connectivity. The supported V.21, V.22, V.23, V.29, V.32, Bell 103, and Bell 212A modes provide compatibility with a broad range of legacy controllers. Integration into a 16-SOIC package helps preserve board area, although line-network protection remains a critical design requirement.
推荐
推荐产品汇总
工程参考数据： SI2434-D-FS ——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 | SI2434-C-FTR | SI2457 | SI2415 | SI2404 |
|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
| Package | 16-SOIC | 16-SOIC - same package | 16-SOIC - same package | 16-SOIC - same package | 16-SOIC - same package |
| Device Role | ISOMODEM system-side | ISOMODEM system-side | ISOMODEM system-side | ISOMODEM system-side | ISOMODEM system-side |
| Telephone-Line Technology | Direct access arrangement (DAA) ISOmodem | DAA ISOmodem | DAA ISOmodem | DAA ISOmodem | DAA ISOmodem |
| Compatible Line-Side Family | Si3018 or Si3010 | Si3018 or Si3010 family | Si3018 or Si3010 family | Si3018 or Si3010 family | Si3018 or Si3010 family |
关键差异点
- Broad legacy protocol coverage in the system-side modem device （对比 SI2404)
- Same-family migration path with a common 16-SOIC footprint （对比 SI2434-C-FTR)
- Dedicated 33.6 kbps modem choice within a multi-device chipset （对比 SI2457)
- High integration reduces discrete telephone-interface footprint （对比 SI2415)
设计说明
Use the Si2457/34/15/04D manufacturer data sheet as the authority for PCB layout, particularly for the system-side-to-line-side signal path, external filters, protection components, and high-voltage telephone-network isolation. Keep the modem signal route short and isolate it from digital clocks and switching supplies. Do not copy a generic RS-232 layout because the telephone-line interface has different impedance and isolation requirements.
Plan a clean 3 V to 3.6 V supply for the SI2434-D-FS and verify the companion line-side device's supply requirements independently. Place the regulator output capacitor and local decoupling capacitors close to their respective pins, with the shortest possible return path to the device ground. Verify startup, voltage tolerance, and line-side current draw in the complete chipset rather than treating the modem and line-side IC as independent loads.
Do not substitute the SI2434 for a line-side device or assume its 16-SOIC footprint alone guarantees interchangeability. Confirm pin functions, supply limits, protocol support, clock requirements, and the intended Si3018 or Si3010 companion. The SI2434-D-FSR result is especially easy to misread as an electrical drop-in because the device base matches; verify the ordering suffix, temperature grade, and delivery format in the manufacturer ordering table.
Telephone-line modem equipment must control conducted and radiated emissions because the line interface couples directly to external wiring. Apply the manufacturer's recommended network filtering and shield or guard the sensitive analog section, and keep switching regulators and their high-current loops away from the modem signal path. Validate emissions and immunity at the finished-product level, since enclosure and cable arrangements materially affect EMC results.
合规信息
The verified part listing states lead-free status and RoHS compliance. Automotive qualification, REACH status, halogen-free status, and conflict-minerals declarations were not identified.
