KSZ8342Q Voice/Fax ATA SoC, 128-QFP | Microchip
MPN: KSZ8342Q ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $41.3 | $41.30 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
KSZ8342Q Overview
An ATA, or Asynchronous Telephone Adapter, is a semiconductor that bridges traditional analog telephone equipment and packet-based IP communications. It belongs to the broader hierarchy of application-specific integrated circuits, communication controllers, network interface processors, and VoIP interface ICs. In this role, the KSZ8342Q supports a complete voice or fax signal path rather than serving as a general-purpose microprocessor or standalone network PHY.
The principal verified feature is high integration in a 128-lead QFP package. The manufacturer datasheet states that the device supplies the logic needed to convert traditional telephone and fax-machine signals into a form suitable for transmission over IP. This integration can reduce the component count required in a voice-access design while providing a dedicated path for telephony signaling, voice processing, and packet-network connectivity. The exact operating voltages, clock requirements, memory interfaces, codec performance, and protocol details are not available in the supplied verified excerpts and must be confirmed from the manufacturer datasheet before design release.
The KSZ8342Q is intended for VoIP ATA equipment, voice/fax gateways, telephone line interface systems, and other embedded communications products. Its dedicated architecture is appropriate when a product needs to interface analog telephone equipment with an IP network. Designers should validate line-interface levels, ringing requirements, codec performance, thermal conditions, and network protocol requirements during schematic and layout review because those parameters are not stated in the verified distributor snippets.
A key design consideration is that this is a complex application-specific communications IC rather than a simple regulator or interface transceiver. PCB layout, power sequencing, grounding, clocking, and high-speed signal integrity should follow the manufacturer reference design and datasheet recommendations. The 128-lead QFP footprint also requires adequate escape routing and thermal copper, while production sourcing should confirm lifecycle status and lead time with authorized distributors.
This page consolidates the verified manufacturer datasheet link, distributor identification, package information, pricing evidence, and engineering caveats. Because the supplied search results do not provide a complete pinout, verified drop-in substitutions, or full electrical tables, those fields are intentionally marked as data-needed rather than inferred.
Drop-in alternatives for KSZ8342Q — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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View Datasheet →KSZ8342Q Specifications
| Device Type | Voice/Fax ATA system-on-chip |
| Product Function | Converts analog telephone and fax signals for transmission over IP networks |
| Architecture | Highly integrated ATA SOC with advanced DSP |
| Product Category | VoIP ATA ASSP |
| Telephone Signal Processing | Analog-to-digital telephone signal processing |
| Fax Support | Voice/fax ATA solution |
| Network Function | IP-network transmission interface |
| Package | 128-lead QFP |
| Manufacturer Package Designation | 128-BFQFP |
| Mounting Type | Surface mount |
| RoHS Status | Compliant |
| Digital Signal Processor | Advanced DSP |
| Logic Integration | Logic required for analog-to-digital telephone conversion |
| Typical Application | VoIP ATA equipment |
KSZ8342Q 128-bfqfp Pin Configuration Guide
Pin configuration for KSZ8342Q (128-bfqfp 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 KSZ8342Q.
Refer to the datasheet for full pin configuration.
Typical Applications
KSZ8342Q is suitable for 6 applications: VoIP ATA Equipment, Telephone Line Gateway, Fax-over-IP Gateway, Embedded Voice Terminal, Industrial VoIP Control Module, Network Voice Adapter.
VoIP ATA Equipment
The KSZ8342Q fits dedicated Voice/Fax ATA equipment because the manufacturer describes it as a complete solution for converting analog telephone and fax signals into a form suitable for IP transmission. It combines an advanced DSP with the logic needed for analog-to-digital telephone processing, reducing the need for several separate communication functions in a dedicated design. The 128-lead QFP provides a defined high-pin-count integration point for telephone, network, power, and control circuitry. Exact voltage, clock, protocol, and codec requirements remain dependent on the full datasheet and reference design.
Recommended
Telephone Line Gateway
The KSZ8342Q is relevant to a telephone line gateway that must bridge traditional analog telephone signals and packet-based IP networks. Its documented Voice/Fax ATA purpose, advanced DSP, and integrated conversion logic address the signal-processing role rather than a general network-management role. Designers should use the manufacturer reference design to establish line coupling, protection, codec support, clocking, and isolation requirements. The verified excerpts do not provide the complete analog line interface or electrical limits, so those details must remain datasheet-controlled.
Recommended
Fax-over-IP Gateway
The manufacturer specifically identifies KSZ8342Q as a Voice/Fax ATA solution, making it applicable to fax-over-IP products that need to connect traditional fax-machine signals with an IP network. The integrated DSP and conversion logic can support a dedicated communications path while leaving the host system responsible for product-level control and management. A production design must verify fax protocol behavior, analog line compatibility, timing, and system firmware against the official documentation. The verified sources do not state supported protocols or line parameters.
Recommended
Embedded Voice Terminal
The KSZ8342Q can serve as the communications centerpiece of an embedded voice terminal when analog telephone signaling must be converted for IP transport. Its integrated Voice/Fax ATA role is more targeted than a general microcontroller, while the 128-lead QFP provides the package scale expected for a complex terminal design. Product engineers should evaluate speaker or handset interfaces, audio codecs, line protection, power rails, and firmware dependencies from the official datasheet. Those subsystem requirements are not available in the supplied search snippets.
Recommended
Industrial VoIP Control Module
The KSZ8342Q is suitable for consideration in an industrial VoIP control module where telephone compatibility and IP connectivity must coexist in a compact embedded product. Its dedicated ATA architecture can offload the telephone and fax conversion function, while the surrounding MCU or system controller handles local user interface, configuration, logging, and supervisory functions. Industrial qualification, temperature limits, EMC behavior, and long-term availability are not stated in the verified excerpts. Those requirements must be resolved before release to production.
Recommended
Network Voice Adapter
The KSZ8342Q matches a network voice adapter by combining an ATA SoC with DSP-based telephone signal conversion. That architecture is useful when a legacy analog endpoint must connect to VoIP infrastructure without building every signal-processing function from discrete components. The verified package and product description support this use case, but the final design still requires verification of interface timing, power, clocks, protocol support, and thermal performance. Use the official reference design rather than relying only on distributor summaries.
Recommended
Recommended Products Summary
Engineering reference data for KSZ8342Q — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ8342Q |
|---|---|---|
| Package | 128-lead QFP | 128-lead QFP |
| Brand | Microchip Technology | Microchip Technology |
| Device Category | VoIP ATA ASSP | VoIP ATA ASSP |
| Telephone/Fax Function | Voice/Fax ATA system-on-chip | Voice/Fax ATA system-on-chip |
| Signal Processing | Advanced DSP with analog-to-digital telephone logic | Advanced DSP with analog-to-digital telephone logic |
| RoHS Status | Compliant | Compliant |
| Verified Unit Price | $41.30 as of 2026-10-22 | $41.30 starting unit price as of 2026-10-22 |
| Drop-In Replacement | KSZ8342Q verified target | No alternate MPN verified in supplied cross-reference data |
Key Differentiators
- Dedicated Voice/Fax ATA functionality (vs General-purpose network controller)
- Integrated DSP-based conversion (vs Discrete telephone-interface implementation)
- RoHS-documented package option (vs Unverified legacy package variant)
Design Notes
Treat the KSZ8342Q as a high-pin-count mixed-signal communications IC. Start layout from the manufacturer reference design, preserve the stated 128-lead QFP footprint, and route sensitive telephone and clock signals away from switching power nodes. Because the verified excerpts do not provide the complete pinout or recommended land pattern, do not infer pad locations or escape routing from the package name alone. Validate the PCB against the official package drawing before fabrication.
The verified data confirms a RoHS-compliant 128-lead QFP but does not state supply rails, current limits, tolerance, sequencing, or decoupling values. Use the manufacturer datasheet and reference schematic to define every power rail and capacitor. Check startup current and analog/digital rail interaction rather than assuming that a general-purpose interface power design is adequate. This note intentionally avoids estimating power dissipation because no verified voltage or current data was supplied.
Telephone, DSP, clock, and IP-facing signals can be sensitive to return paths and crosstalk even when the product is implemented in a large QFP package. Keep high-speed and clock routes short, provide continuous reference planes where appropriate, and isolate noisy switching paths from analog telephone sections. The required trace lengths, impedances, filters, and grounding topology must come from the official datasheet and reference layout; they are not available in the verified search data.
Do not substitute a generic network controller or an unverified Voice/Fax ATA IC for KSZ8342Q. The replacement must match the 128-lead package and pinout, supply requirements, clocking, DSP behavior, telephony functions, and firmware expectations. The supplied cross-reference search results only identify tools and the target part, not a compatible substitute. Request a manufacturer-approved cross-reference and compare the complete documentation before changing a production design.
Compliance Information
The verified Microchip datasheet states that the KSZ8342Q is available in a RoHS-compliant 128-lead QFP package. No verified REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification data was supplied.
