SI2439-A-FM - V.34/V.92 Global DAA Modem | Skyworks
料号： SI2439-A-FM ✓ 量产中SI2439-A-FM 概述
An ISOmodem is an integrated modem IC that combines a data-access arrangement with modem signal-processing functions. In the broader semiconductor hierarchy, it is a communication interface IC and a network controller/processor-class device that connects host equipment to analog telephone, WAN, or digital-network interfaces. The integrated DAA reduces the number of external telephone-line interface components needed in a connected product.
The SI2439-A-FM is identified as a V.34 and V.92 modem solution with a stated data rate of 33.6 kbps. Its 38-QFN construction is intended for compact surface-mount equipment, while the exposed-pad package arrangement supports board-level thermal management. The 3 V to 3.6 V operating range allows the modem circuitry to operate from a regulated low-voltage rail in embedded communications equipment.
This part belongs to Skyworks' ISOmodem family, where modulation, data pumping, line-interface functions, and a global DAA are consolidated into one mixed-signal semiconductor. Consolidation can reduce external component count and board area compared with a discrete modem implementation. The package also reduces interconnect complexity by placing the modem functions and their required land pattern on a single surface-mount device.
Typical uses include embedded asynchronous modems, data communications equipment, telephone-network interfaces, industrial data links, and legacy WAN connectivity equipment. Selection is appropriate when a design specifically requires V.34 or V.92 compatibility, a 33.6 kbps modem channel, and the SI2439-A-FM's integrated global DAA. Host software, line-interface support, and regulatory certification must be evaluated as part of the complete modem subsystem.
The principal design consideration is the exposed-pad footprint. Place the device according to the manufacturer's land pattern, provide all supply and ground connections, and follow the datasheet's recommended decoupling and thermal-layout requirements. Because modem performance depends on the surrounding telephone interface and implementation, validate conducted emissions, line behavior, and interoperability in the final equipment rather than relying only on individual IC measurements.
This page consolidates the verified product identity, package information, modem standards, supply range, and sourcing information into one engineering reference. It also distinguishes confirmed device attributes from details that require direct review of the manufacturer datasheet, including the complete pin table, clocking requirements, line-interface values, and approved application configurations.
直接替换替代料： SI2439-A-FM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料SI2439-A-FM 规格参数
| Product Type | Integrated ISOmodem modem IC |
| Supported Modem Standards | V.34 and V.92 |
| Maximum Stated Data Rate | 33.6 kbps |
| Integrated Line Interface | Global DAA |
| Supply Voltage Range | 3 V to 3.6 V |
| Package Type | 38-QFN with exposed pad |
| Package Dimensions | 5 mm x 7 mm |
| 安装类型 | Surface mount |
| Shipping Package | Tray |
| Product Classification | Interface ICs and modems |
| Manufacturer | Skyworks Solutions |
| 引脚数量 | 38 pins |
| Supplier Packaging Form | Tray |
SI2439-A-FM tray 引脚配置指南
SI2439-A-FM（tray 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： SI2439-A-FM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI2439-A-FM 适用于 6 应用s: Legacy WAN Data Communications, Embedded Telephone Network Interface, Industrial Data Link Terminal, Network Management Gateway, Point-of-Sale Terminal, Remote Monitoring Controller.
Legacy WAN Data Communications
The SI2439-A-FM fits embedded legacy WAN equipment that must terminate a V.34 or V.92 modem connection at up to 33.6 kbps. Its single-chip ISOmodem architecture combines modem processing with a global DAA, reducing the number of separate line-interface functions required around the device. In a communications appliance, the IC can form the core of an asynchronous modem channel while the host processor handles higher-layer protocols and configuration. The 38-QFN surface-mount package helps preserve board area, while the 3 V to 3.6 V supply range supports integration with regulated low-voltage logic rails. Final equipment must validate line conditioning, modem interoperability, conducted emissions, and regional regulatory compliance.
Embedded Telephone Network Interface
The SI2439-A-FM is appropriate for embedded products requiring an integrated global DAA alongside V.34 and V.92 modem operation. Instead of implementing a complete modem and data-access arrangement with multiple discrete blocks, a designer can place the 38-QFN device at the interface between host electronics and the required telephone-network circuitry. Its 33.6 kbps operating rate supports legacy data links, while the integrated global DAA can simplify implementation around the manufacturer-recommended external network. The exposed-pad QFN construction requires a carefully designed land pattern and copper thermal path. System validation should cover ring detection, line-state behavior, data throughput, isolation strategy, and applicable network-interface approvals.
Industrial Data Link Terminal
An industrial terminal or controller that still relies on modem-based WAN service can use the SI2439-A-FM for a compact V.34/V.92 interface. The 33.6 kbps modem rate is appropriate for management traffic, configuration sessions, and remote links rather than high-volume file transfer. Integrating the ISOmodem and global DAA in one 38-QFN device can reduce connector and board-area requirements compared with a larger multi-component modem design. Designers should place the exposed-pad device according to the manufacturer land pattern, preserve the recommended supply decoupling, and isolate the telephone-side network according to the applicable product safety architecture. Verify operation across real telephone lines and at the maximum intended environmental conditions.
Network Management Gateway
The SI2439-A-FM can provide a maintenance or fallback connectivity path in a network management gateway that must support V.34 and V.92 at 33.6 kbps. A low-rate modem channel can complement an Ethernet-based management interface when legacy infrastructure is still present, allowing configuration access and diagnostic traffic through an integrated global DAA. The surface-mount 38-QFN package is suited to compact gateways, and its 3 V to 3.6 V operating range can simplify rail sharing with digital control circuitry. The modem is not a replacement for a modern high-bandwidth WAN interface; it is appropriate where compatibility with older endpoints is mandatory. Firmware should include timeout, fallback, and line-quality behavior before production deployment.
Point-of-Sale Terminal
The SI2439-A-FM can support point-of-sale terminals that must communicate through a V.34/V.92 modem channel while also using an integrated global DAA. Its 33.6 kbps rate is sufficient for transaction authorization, short command exchanges, and remote support traffic when those workflows are designed around legacy infrastructure. Integrating modem functions into one 38-QFN device reduces the physical footprint of the communications section, which can help compact countertop equipment. The design must provide the manufacturer-recommended telephone network and isolation arrangement, maintain stable 3 V to 3.6 V supply conditions, and account for the exposed pad during PCB layout. End-to-end testing should include line noise, transaction timing, reboot recovery, and regional telephone-network requirements.
Remote Monitoring Controller
The SI2439-A-FM can serve as a fallback communications path in remote monitoring equipment where V.34 or V.92 infrastructure remains available. A 33.6 kbps channel is suitable for periodic status reports, configuration downloads, alarms, and diagnostic commands, while the integrated global DAA limits the external modem line-interface component count. The 5 mm by 7 mm 38-QFN package supports compact controller boards and its regulated 3 V to 3.6 V operating range can align with embedded digital rails. Designers should establish an application-specific timeout and retry policy so the modem does not dominate system recovery time. Qualification must include environmental testing, telephone-line stress, EMC measurements, and confirmation that the complete product meets all applicable communications and safety requirements.
工程参考数据： SI2439-A-FM ——对比、设计指导和合规信息。
选型指南
设计说明
Use the manufacturer land pattern for the 38-QFN exposed-pad package rather than creating a generic QFN footprint from package height alone. Confirm the pad dimensions, exposed-pad area, solder-mask opening, and paste stencil from the datasheet drawing. The device is only 5 mm by 7 mm, so routing escape and thermal-via placement should be planned together before the surrounding modem-network components are placed.
Design the modem rail from the stated 3 V to 3.6 V supply range and preserve the manufacturer's recommended bypass-capacitor arrangement at the supply and ground pins. Check ripple and transient performance under the full modem operating state because line-network transitions can create supply disturbance. Keep sensitive analog and high-current return paths under control so switching activity in the host system does not degrade modem or DAA performance.
Treat the exposed pad as both a package feature and a thermal path. Follow the datasheet's exposed-pad connection and via recommendations, and provide continuous copper where the footprint permits. Thermal performance depends on board area, copper layers, airflow, and neighboring heat sources, so use junction-temperature and board-level thermal analysis for the final enclosure rather than assuming the package alone defines safe operating conditions.
Do not treat a similar base number or reel suffix as proof of interchangeability. Confirm the exact manufacturer, package, pin assignments, exposed-pad treatment, electrical limits, modem features, clocking, and host-interface behavior against the authoritative documentation. Also validate the complete external telephone network and isolation arrangement, since replacing only the modem IC cannot guarantee that a finished product retains regulatory or line-interface compliance.
合规信息
No specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations were identified in the available product records. Confirm these requirements with Skyworks Solutions using the exact orderable MPN before production release.
