SI32171-C-GM1 - 1-Channel FXS ProSLIC, 42-QFN | Skyworks
Référence : SI32171-C-GM1 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.42 | $6,42 |
| 10 | $5.78 | $57,80 |
| 100 | $5.16 | $516,00 |
| 500 | $4.61 | $2 305,00 |
| 1 000 | $4.08 | $4 080,00 |
SI32171-C-GM1 Présentation
A ProSLIC (Subscriber Line Interface Concept) is a highly integrated mixed-signal IC that replaces dozens of discrete components traditionally needed to interface a digital system-on-chip to the analog two-wire telephone subscriber line. In the system hierarchy, the ProSLIC sits between the host SoC (or DSP) and the tip/ring pair, performing the BORSCHT functions (Battery feed, Over-voltage protection, Ringing, Supervision, Coding, Hybrid, and Testing). As an FXS device, it provides the central office side of the analog subscriber loop and is fundamental to VoIP gateways, integrated access devices, and fixed-line terminal adapters.
Key features include a complete single-channel FXS solution, automatic battery voltage generation via the integrated DC-DC controller, internal balanced or unbalanced ringing with patented low-power ringing, global programmability for LSSGR/ITU/ETSI line standards, simplified configuration/diagnostics, and DTMF detect on-chip. The 5x7 mm footprint and reduced BOM significantly shrink the PCB area versus discrete line-interface designs.
Technically, the Si3217x family uses CMOS mixed-signal design with on-chip high-voltage charge-pump drivers, an integrated DC-DC switching controller that derives optimal battery voltages per line state, and a Sigma-Delta codec pair for the transmit/receive paths. The automatic battery-voltage tracking dynamically minimizes power dissipation in on-hook, off-hook, and ring states, while the low-power ringing architecture avoids the bulky external ring relay in many designs.
Typical applications include VoIP residential gateways, xDSL integrated access devices (IADs), cable telephony eMTA, fiber-to-the-home (ONT/ONU) voice ports, fixed wireless terminals, and small-office/home-office analog terminal adapters (ATAs). It is also used in industrial remote-metering and alarm panels where a single analog FXS port is required.
When designing with this part, attention must be paid to the DC-DC inductor selection, line-side protection component choice (over-voltage, surge, PTC), and PCB creepage/clearance between the high-voltage traces and the low-voltage digital interface. The exposed thermal pad must be soldered to a sufficient ground pour for heat dissipation during sustained off-hook or ring states.
This page synthesizes distributor pricing, drop-in family variants, and practical design notes not found in the manufacturer datasheet alone, enabling faster BOM selection and supply-chain risk assessment for ProSLIC-based FXS designs.
Alternatives de remplacement direct pour SI32171-C-GM1 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
SI32176-B-FMR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI32171-C-FM1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI32170-C-FM1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI32173-C-FM1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI32172-C-GM1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI32171-C-GM1 Spécifications
| Fonction | Single-channel FXS ProSLIC (Subscriber Line Interface Concept) with integrated DC-DC controller |
| Host Interface | PCM / SPI |
| Number of Channels | 1 (single FXS port) |
| Tension d'alimentation | 3.3 V (digital and analog core) |
| I/O Logic Levels | 3.3 V and 1.8 V supported |
| Battery Voltage | Internally generated (integrated DC-DC controller); supports up to -110 V line feed |
| Maximum Ring Voltage | -110 V (peak ringing amplitude) |
| Ringing Modes | Internal balanced or unbalanced ringing; patented low-power ringing |
| DTMF Detection | On-chip DTMF detect |
| Coding | Sigma-Delta codec (on-chip) |
| Compliance | LSSGR / ITU / ETSI line-interface specifications |
| Boîtier | 42-pin QFN (5x7 mm) |
| Type de montage | Surface Mount |
| Family | Si3217x ProSLIC (pin-compatible family) |
| Statut RoHS | Compliant |
Guide de configuration des broches du SI32171-C-GM1 42-pin qfn (5x7 mm)
Configuration des broches du SI32171-C-GM1 (boîtier 42-pin qfn (5x7 mm)). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour SI32171-C-GM1.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
SI32171-C-GM1 convient pour 6 applications: VoIP Residential Gateway, xDSL Integrated Access Device (IAD), Cable eMTA Voice Port, FTTH ONT/ONU Voice Port, Analog Terminal Adapter (ATA), Industrial Alarm/Remote Metering Panel.
VoIP Residential Gateway
The SI32171-C-GM1's single-channel FXS implementation with integrated DC-DC controller and on-chip codec makes it ideal for residential VoIP gateways where PCB area is constrained. Its -110 V ringing capability, patented low-power ringing architecture, and DTMF detector cover the full telephony BOM in one 42-QFN part. Placed between the host SoC's PCM/SPI port and the RJ-11 jack, it eliminates the bulky external ring relay while supporting LSSGR, ITU, and ETSI line standards.
Recommandé
xDSL Integrated Access Device (IAD)
For xDSL IADs combining DSL modem, router, and FXS voice ports, the SI32171-C-GM1 delivers a single FXS line with minimal external BOM. Its 3.3 V supply and 3.3 V/1.8 V I/O compatibility match typical xDSL SoC rails, while the integrated DC-DC controller dynamically minimizes battery voltage to reduce heat dissipation during idle/standby. The compact 5x7 mm footprint fits alongside the DSL transceiver and Ethernet PHY in a small-form-factor IAD enclosure.
Recommandé
Cable eMTA Voice Port
In cable embedded MTAs (eMTA), the SI32171-C-GM1 provides the analog FXS interface for one voice line, meeting PacketCable and EuroPacketCable specifications through LSSGR/ITU/ETSI compliance. The integrated Sigma-Delta codec and on-chip DTMF detection simplify the BOM, while the integrated DC-DC controller handles the high battery voltages required for long subscriber loops. Engineers can scale to multi-line eMTAs by paralleling additional SI32171 channels.
Recommandé
FTTH ONT/ONU Voice Port
FTTH optical network terminals that offer legacy POTS service use the SI32171-C-GM1 to convert the SoC's PCM/SPI voice stream into an analog subscriber line. Its wide operating range and global programmability make it suitable for ONTs deployed in regions with diverse line standards. The integrated ringing generator supports -110 V peak amplitudes required for long international loops while keeping power dissipation low.
Recommandé
Analog Terminal Adapter (ATA)
Single-port ATAs converting SIP/RTP to analog POTS benefit from the SI32171-C-GM1's compact footprint and high integration. The internal balanced or unbalanced ringing capability supports worldwide ring-cadence programming, and the integrated DTMF detector eliminates an external DSP for tone detection. With its 42-QFN 5x7 mm package, the entire analog interface fits behind a single RJ-45 jack on a wall-plug ATA.
Recommandé
Industrial Alarm/Remote Metering Panel
Industrial alarm panels and remote-metering endpoints that need to communicate over legacy analog PSTN lines use the SI32171-C-GM1 as their FXS interface. The integrated DC-DC controller and on-chip surge robustness simplify compliance with telecom safety standards, while the SPI host interface allows easy connection to industrial MCUs. Its small 5x7 mm footprint fits inside sealed outdoor enclosures alongside surge-protection and battery-backup circuitry.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SI32171-C-GM1 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SI32176-B-FMR | SI32171-C-FM1 | SI32170-C-FM1 | SI32173-C-FM1 | SI32172-C-GM1 |
|---|---|---|---|---|---|---|
| Brand | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks |
| Package | 42-QFN (5x7 mm) | 42-QFN (5x7 mm) - same | 42-QFN (5x7 mm) - same | 42-QFN (5x7 mm) - same | 42-QFN (5x7 mm) - same | 42-QFN (5x7 mm) - same |
| Function | 1-channel FXS ProSLIC, PCM/SPI | 1-channel FXS ProSLIC, PCM/SPI | 1-channel FXS ProSLIC, PCM/SPI | 1-channel FXS ProSLIC, PCM/SPI (basic) | 1-channel FXS ProSLIC, ISI interface | 1-channel FXS ProSLIC, ISI interface |
| Maximum Ring Voltage | -110 V | -110 V | -110 V | -110 V | -110 V | -110 V |
| Host Interface | PCM/SPI | PCM/SPI | PCM/SPI | PCM/SPI | ISI (3-wire) | ISI (3-wire) |
| DTMF Detect | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) |
| Integrated DC-DC Controller | Yes | Yes | Yes | Yes | Yes | Yes |
| Supply Voltage | 3.3 V (I/O: 3.3 V or 1.8 V) | 3.3 V (I/O: 3.3 V or 1.8 V) | 3.3 V (I/O: 3.3 V or 1.8 V) | 3.3 V (I/O: 3.3 V or 1.8 V) | 3.3 V (I/O: 3.3 V or 1.8 V) | 3.3 V (I/O: 3.3 V or 1.8 V) |
Principaux différenciateurs
- PCM/SPI host interface in a 42-QFN footprint (vs SI32172-C-GM1 (ISI host interface))
- Full -110 V ringing support on-chip (vs Si32170-C-FM1 (basic PCM/SPI variant))
- Integrated DC-DC controller eliminates external switching supply (vs Discrete line-interface designs (multi-IC solutions))
Notes de conception
The 42-QFN (5x7 mm) exposed thermal pad must be soldered to a continuous ground pour for both thermal dissipation and electrical reference. Per the Skyworks Si3217x datasheet, allocate at least 25 mm^2 of copper pour on the top layer and stitch with 0.3 mm vias to internal ground planes. Maintain 0.5 mm minimum creepage between the high-voltage tip/ring traces and the low-voltage PCM/SPI traces to meet IEC 60950 / UL 60950 telecom safety requirements.
The integrated DC-DC controller requires an external inductor (typically 47 uH to 100 uH, shielded, low-DCR) and a low-ESR ceramic bypass capacitor stack on the battery rail. Use the inductor and capacitor values recommended in the Si3217x datasheet BOM table; deviating can cause battery-rail ripple that couples into the audio path as audible noise. Estimate battery-rail decoupling needs based on worst-case ring cadence, not steady-state off-hook current.
Route the PCM/SPI signals as impedance-controlled traces (typically 50 ohm) and keep them isolated from the high-voltage tip/ring traces by at least 4 mm of clearance or a ground guard trace. Place the line-side protection devices (PTC, MOV, TVS) directly at the RJ-11/JP1C connector and minimize trace stubs. Place the Si32171-C-GM1 as close as possible to the RJ-11 connector to keep tip/ring loop area small and reduce EMI pickup.
Do not apply power to the Si32171-C-GM1 without first verifying that the host SoC's PCM/SPI master clock is present and stable; otherwise the part may enter an undefined state. Do not share the 3.3 V digital supply between the Si32171 and high-current digital circuitry; star-ground the 3.3 V at the Si32171's decoupling cap to avoid ground bounce that can corrupt PCM frames. Finally, do not omit the line-side over-voltage protection - even with internal transient robustness, a sustained surge will destroy the part.
Informations de conformité
RoHS and REACH compliant per Skyworks product page and DigiKey listing. AEC-Q100 not applicable (telecom IC, not automotive). LB/TLC compliant per the datasheet's lead-free process declaration.
