SI2438-A-FT - 33.6kbps V.34 ISOmodem | Skyworks
Teilenummer: SI2438-A-FT ✗ AbgekündigtSI2438-A-FT Übersicht
An ISOmodem is a semiconductor implementation of the ITU-T V.34 modem standard. Within the telecommunications hierarchy, a V.34 modem belongs to data-communication ICs, interface ICs, and broader network-access semiconductors. It converts digital data into signals compatible with switched telephone networks while supporting call-control and voice-related functions. A system-side modem IC is commonly paired with a line-side counterpart, host interface circuitry, and isolation or telephone-network protection components.
The SI2438-A-FT is identified as a 56k-class V.34 device, while comparison documentation states a maximum data rate of 33.6 kbps. Its key characteristics include a 24-TSSOP package, support for data, fax, and voice operation, and a lead-free construction. These characteristics suit compact embedded and telecom products that must retain compatibility with established V.34 equipment rather than migrate to a newer modem architecture.
The device represents a compact integration of modem signal processing, control logic, and interface functions. Its 24-pin surface-mount format allows moderate board-space savings compared with a larger through-hole package, while tube packaging can support controlled manufacturing and automated assembly. System designers must account for the obsolete lifecycle status and confirm availability before committing to new production quantities.
Typical uses include legacy fax equipment, data terminal interfaces, industrial data-communication equipment, voice-over-data systems, and embedded telecom products that require V.34 operation. A host processor and suitable telephone-line interface components remain necessary around the modem IC. The related SI2438-B-FT and SI2456-FTR devices can provide useful product-family migration options when their exact electrical and pin requirements are verified against the target design.
For a new layout, use the 24-TSSOP footprint and the pin-description table in the manufacturer datasheet before assigning signals or routing sensitive telephone-network nodes. Check the telephone-line protection network, supply requirements, clocking, interface levels, and component tolerances. Because the SI2438-A-FT is obsolete, production continuity and lifecycle risk should be resolved before schematic release.
This page consolidates the known package, data-format, voice, lifecycle, and environmental characteristics of the SI2438-A-FT with family alternatives and practical design guidance. The comparison tables focus on verified package and modem-function differences, helping engineers identify which same-package candidates merit a formal second-source review.
Drop-in-Alternativen für SI2438-A-FT – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
SI2438-B-FT
✅ Drop-InPreis auf Anfrage
SI2456-FTR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI2418-B-FT
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI2438-A-FT Technische Daten
| Product Type | ISOmodem V.34 system-side IC |
| Manufacturer | Skyworks Solutions Inc. |
| Data Format | V.34 |
| Modem Class | 56k V.34 |
| Maximum Data Rate | 33.6 kbps |
| Supported Functions | Data, fax, and voice |
| Device Role | ISOmodem system-side |
| Package Type | 24-TSSOP |
| Package Width | 4.40 mm |
| Pin-Anzahl | 24 pins |
| Montageart | Surface mount |
| Packaging | Tube |
| Lead-Free Status | Lead free |
| RoHS-Status | RoHS compliant |
| Product Status | Obsolete |
SI2438-A-FT 4.40 mm Pinbelegungsleitfaden
Pinbelegung für SI2438-A-FT (4.40 mm-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für SI2438-A-FT.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
SI2438-A-FT ist geeignet für 6 Anwendungs: Legacy Fax Terminals, Industrial Data Communication Equipment, Voice and Data Terminals, Embedded Remote-Service Terminals, Network Extender and Router Management, Legacy Voice Mail Systems.
Legacy Fax Terminals
The SI2438-A-FT fits legacy fax terminals that require an established V.34 modem path for data and fax transmission. Its 56k modem class and stated maximum rate of 33.6 kbps align with the communication throughput expected from this product generation, while the 24-TSSOP package supports compact surface-mount terminal designs. The IC provides the system-side modem function, but the complete product still needs a host interface, telephone-line coupling network, protection components, and voice support circuitry where required. Because the component is obsolete, engineers should also confirm remaining supply and validate an eventual same-family migration before committing a new terminal design to production.
Empfohlen
Industrial Data Communication Equipment
The SI2438-A-FT is suitable for legacy industrial data terminals that communicate over telephone-line networks using V.34. Its stated 33.6 kbps maximum data rate is appropriate for supervisory data, configuration transfer, and equipment-status traffic rather than modern high-speed Ethernet workloads. The 24-pin TSSOP package reduces board area, while its obsolete lifecycle status makes supply continuity an important engineering consideration. A production design should verify the operating voltage, temperature range, line-interface protection, isolation requirements, and exact pin functions in the manufacturer datasheet before release.
Empfohlen
Voice and Data Terminals
The SI2438-A-FT supports combined data, fax, and voice modem functions, making it applicable to older voice/data terminal designs that share one telephone-network interface. Its 56k V.34 class and maximum 33.6 kbps data rate match the performance generation of those systems, while the compact 24-TSSOP footprint allows integration into space-constrained equipment. The device does not eliminate the need for telephone-line protection, audio coupling, or host control. For new programs, the system integrator should compare the SI2438-B-FT and SI2456-FTR family candidates and confirm their voice-processing and interface behavior rather than assuming electrical interchangeability.
Empfohlen
Embedded Remote-Service Terminals
The SI2438-A-FT can serve as the modem element in an embedded remote-service terminal designed around V.34 telephone-line connectivity. At a maximum stated rate of 33.6 kbps, it is appropriate for remote diagnostics, configuration exchange, and low-bandwidth control traffic. Its 24-TSSOP package supports compact board layouts, but the surrounding telephone-network interface must be designed for the voltage, surge, and isolation conditions of the target installation. Since the device is obsolete, maintain a documented migration path based on a verified same-family device and avoid extending the original design beyond its intended legacy market.
Empfohlen
Network Extender and Router Management
The SI2438-A-FT can support management access in legacy network extenders and routers that use dial-up telephone connections for installation, maintenance, or fallback management. The V.34 modem class and 33.6 kbps maximum rate provide an established control-channel solution rather than high-throughput transport. Its surface-mount 24-TSSOP package is useful where board area is constrained, while the host processor handles configuration and remote diagnostics. Engineers should verify line protection, ring detection, and interface voltage levels against the manufacturer documentation, and evaluate the SI2438-B-FT as the first same-family lifecycle alternative.
Empfohlen
Legacy Voice Mail Systems
The SI2438-A-FT is relevant to legacy voice-mail systems that combine V.34 data control with telephone-line voice functions. The IC's documented data, fax, and voice capabilities allow one modem subsystem to support remote mailbox configuration alongside established voice signaling. Its 24-TSSOP package is suitable for compact controller boards, although the complete voice path still requires the appropriate audio and telephone-network interface circuits. The obsolete lifecycle status requires careful stock management and a controlled alternative strategy. SI2438-B-FT is the closest identified candidate for engineering review because it shares the 24-TSSOP package, 56k class, and 33.6 kbps family rating.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SI2438-A-FT – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SI2438-B-FT | SI2456-FTR | SI2418-B-FT |
|---|---|---|---|---|
| Brand | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. |
| Package | 24-TSSOP | 24-TSSOP - same | 24-TSSOP - same | 24-TSSOP - same |
| Pin Count | 24 pins | 24 pins | 24 pins | 24 pins |
Wichtigste Unterscheidungsmerkmale
- Closest documented family replacement (vs. SI2438-B-FT)
- Same-package family reference with documented RoHS compliance (vs. SI2456-FTR)
- Closest functional family reference for legacy modem designs (vs. SI2418-B-FT)
Designhinweise
Do not approve a substitution from package shape alone. The SI2438-A-FT, SI2438-B-FT, SI2456-FTR, and SI2418-B-FT references use the same 24-TSSOP format, but pin behavior, modem features, electrical limits, and lifecycle conditions must be compared in the manufacturer documentation. The SI2438-B-FT is the strongest first candidate because its documented 56k class, 33.6 kbps rate, and V.34 system-side function align with the target.
Route telephone-network and modem-sensitive nodes according to the reference layout in the manufacturer datasheet, keeping the external line-interface components close to their associated pins. Maintain the specified ground and bypass-capacitor placement, and observe creepage, clearance, isolation, and surge requirements imposed by the target telephone-network installation. Do not infer these values from the package dimensions alone.
Verify the complete power tree before layout release because operating voltage, current consumption, power dissipation, and bypass requirements are not established by the available product records. Use the SI2438-A-FT datasheet limits as the governing constraints and include local decoupling where directed. Estimated: no power-loss calculation is presented because the required input voltage, output voltage, and load current were not established.
Treat the obsolete lifecycle status as a design risk rather than an immediate technical failure mode. Freeze a traceable procurement quantity for maintenance builds, record date codes and test conditions, and qualify SI2438-B-FT before the last acceptable procurement date. If the alternate fails pin, timing, or firmware qualification, retain the SI2438-A-FT as the maintenance-only source rather than making an unverified PCB change.
Compliance-Informationen
The SI2438-A-FT is identified as RoHS compliant and lead free. No automotive qualification or halogen-free declaration was identified.