SI3012-KS - V.90 Global MC'97 Silicon DAA | Silicon Laboratories
MPN: SI3012-KS ✗ End of LifeSI3012-KS Overview
A direct access arrangement, or DAA, is the telephone-interface portion of a modem or communications system. It connects the host codec and modem data path to an analog telephone line while providing the signaling, isolation, and transmit/receive functions needed for global line-interface operation. In the component hierarchy, the SI3012-KS is a communications interface IC rather than a general-purpose codec or memory device.
Verified feature data identifies AC'97 2.1 compliance, support for primary or secondary codec operation, and compatibility with FCC, CTR21, JATE, and other public telephone network requirements. Its 84 dB dynamic range provides the principal quantified signal-path performance figure, while the 5 V supply simplifies integration with conventional communications equipment.
The SI3012-KS is specifically associated with V.90 modem designs and is listed as a Modem V.90 device in 16-SOIC packaging. The product is marked not recommended for new designs, with Si3018 identified by the distributor listing as the recommended successor for new-product planning. This lifecycle distinction is important for maintenance and repair work involving existing V.90 equipment.
Typical uses include V.90 data-modem hardware, analog telephone-line interfaces, primary and secondary AC'97 codec connections, and legacy communications equipment requiring global telephone-network interface support. Its 5 V operating supply and 84 dB transmit/receive dynamic range fit established analog modem architectures, while the stated regulatory and PTT compatibility support deployment across multiple international line standards.
Designers should preserve the manufacturer's reference circuit and verify the external isolation, line-interface, and codec connections against the SI3012-KS datasheet. Because the SI3012-KS is not recommended for new designs, new products should evaluate the Si3018 instead of assuming functional interchangeability. The available search data does not provide a verified pinout, detailed timing specification, or manufacturer pricing, so those values should be confirmed before schematic capture or procurement.
This page distinguishes the SI3012-KS communications DAA from the similarly named Sanken SI-3012KS low-dropout regulator, consolidates verified lifecycle and feature information, and identifies the documented successor path for engineers evaluating legacy V.90 modem designs.
Drop-in alternatives for SI3012-KS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesSI3012-KS Specifications
| Product Type | Global MC'97 silicon direct access arrangement |
| Application Classification | V.90 modem |
| AC'97 Interface Compliance | AC'97 2.1 compliant |
| Codec Role | Primary or secondary codec |
| Line Interface | Global phone-line interface |
| Dynamic Range | 84 dB across TX/RX paths |
| Power Supply Voltage | 5 V |
| Isolation Voltage | Greater than 3000 V |
| Regulatory Compatibility | FCC, CTR21, JATE, and other PTTs |
| Package | 16-pin SOIC |
| Mounting Type | Surface Mount |
| Lifecycle Recommendation | Not recommended for new designs; Si3018 identified as successor |
| Manufacturer | Silicon Laboratories |
SI3012-KS 16-pin soic Pin Configuration Guide
Pin configuration for SI3012-KS (16-pin soic package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for SI3012-KS.
Refer to the datasheet for full pin configuration.
Typical Applications
SI3012-KS is suitable for 6 applications: V.90 Modem Line Interface, Global Analog Telephone-Line Interface, Primary AC'97 Codec Connection, Secondary AC'97 Codec Connection, Legacy Communication Equipment Maintenance, Telephone Network Isolation Stage.
V.90 Modem Line Interface
The SI3012-KS fits established V.90 modem hardware because it combines an AC'97 2.1-compliant primary or secondary codec connection with a global phone-line interface. Its 5 V supply matches conventional modem electronics, while the 84 dB dynamic range across the TX and RX paths provides the documented signal-chain performance. In a new design, the non-recommended-for-new-designs status of the SI3012-KS should override otherwise attractive legacy compatibility, so engineers should evaluate the Si3018 as the named successor. For repair and product-maintenance work, preserving the existing 16-SOIC layout may justify continued use of the SI3012-KS after confirming distributor availability and regulatory requirements.
Recommended
Global Analog Telephone-Line Interface
The SI3012-KS is applicable to global analog telephone-line equipment because its verified feature set identifies compliance with FCC, CTR21, JATE, and other public telephone network requirements. The device combines the codec-side interface with the line-side DAA functions needed by a modem, rather than requiring a codec alone. Its greater than 3000 V isolation rating is the key quantified electrical feature for reviewing telephone-line separation, while the 5 V supply simplifies integration with the surrounding modem electronics. Each country or network still requires confirmation of applicable approvals and line-interface details before production release.
Recommended
Primary AC'97 Codec Connection
The SI3012-KS can be used in modem architectures requiring a primary AC'97 codec connection, as explicitly stated in the verified feature listing. This role places the DAA on the host-side digital codec path while retaining its global telephone-line interface. The 2.1-compliant interface, 5 V operating supply, and 84 dB transmit/receive dynamic range provide the main design checkpoints. Because the available data does not expose complete timing tables or pin assignments, an engineer must reproduce the manufacturer reference circuit and verify signal and isolation requirements in the original datasheet before layout release.
Recommended
Secondary AC'97 Codec Connection
The SI3012-KS supports secondary as well as primary codec operation, allowing it to fit systems in which the modem data path is attached differently from a primary host codec. This flexibility makes the part useful when maintaining established AC'97-based modem designs. Its 84 dB TX/RX dynamic range and 5 V power supply are the primary quantified fit criteria, while global line-interface and greater than 3000 V isolation support remain essential. For new equipment, engineers should evaluate the Si3018 because the verified distributor data marks the SI3012-KS as not recommended for new designs.
Recommended
Legacy Communication Equipment Maintenance
The SI3012-KS is most defensible in maintenance, repair, and continuation-of-production programs for existing V.90 modem equipment. Its 16-SOIC package and established V.90 association make it potentially useful where the surrounding board and firmware cannot be redesigned. The documented 5 V supply, 84 dB TX/RX dynamic range, AC'97 2.1 interface, and global line-interface capabilities provide a basis for identifying the correct legacy part. Procurement should account for its NRND status, and the SI3012-KS must be distinguished from the unrelated Sanken SI-3012KS regulator when searching distributor databases.
Recommended
Telephone Network Isolation Stage
The SI3012-KS can participate in a telephone-network isolation stage because the verified documentation specifies greater than 3000 V isolation for the Global MC'97 silicon DAA. Isolation is central to separating the line-connected communications circuitry from the host system, and the 5 V supply permits integration with conventional modem electronics. The value must still be evaluated using the manufacturer's complete application circuit, creepage, clearance, and component requirements rather than treated as a standalone guarantee. The FCC, CTR21, JATE, and other PTT compatibility listed for the device supports international legacy deployments subject to local approval.
Recommended
Recommended Products Summary
Engineering reference data for SI3012-KS — comparison, design guidance, and compliance information.
Selection Guide
Key Differentiators
- Complete legacy telephone-interface function (vs General-purpose AC'97 codec)
- International line-interface coverage (vs Region-specific telephone interface)
- Established 5 V V.90 integration (vs Si3018)
Design Notes
Do not confuse Silicon Laboratories SI3012-KS with the Sanken SI-3012KS. The former is a 16-SOIC Global MC'97 silicon DAA for V.90 modem equipment, while the latter is an 8-pin low-dropout linear regulator. Their similar character sequences create a serious procurement and schematic-substitution risk, so use the full manufacturer name, package, and function together when searching or requesting parts.
Treat the SI3012-KS as a line-interface device rather than a generic codec. Preserve the manufacturer reference schematic for telephone-line isolation, codec-side routing, and supply decoupling, and verify the applicable creepage, clearance, and isolation requirements for the target country. The available verified excerpt confirms greater than 3000 V isolation but does not provide a complete PCB layout or safety table, so those details must be taken directly from the manufacturer documentation.
The SI3012-KS operates from 5 V. Confirm the complete modem-board power tree and the voltage tolerances of every external line-interface component before substituting it into an existing design. The search excerpt provides no current consumption, tolerance, or sequencing limits, so a power budget cannot be calculated reliably from the available data. Use the manufacturer electrical-characteristics table and original board schematic for those checks.
Use the documented 84 dB dynamic range as the principal TX/RX signal-chain performance target when assessing an existing design. AC'97 2.1 compliance identifies the digital codec interface version but does not provide bus timing, clocking, or impedance guidance in the supplied excerpts. Preserve established routing, grounding, isolation, and codec clock arrangements when repairing the design, and consult the full datasheet before altering edge rates or trace topology.
Compliance Information
The verified feature data identifies FCC, CTR21, JATE, and other PTT compatibility, but no explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations were supplied. AEC-Q100 is not applicable because this is a communications DAA rather than an automotive-qualified device.