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Home > Products > Integrated Circuits (ICs) > Interface > Telecom

Microchip Technology LE79271AMQC

Name: LE79271AMQC
Brand: Microchip Technology
SKU: LE79271AMQC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LE79271AMQC

Manufacturer:: Microchip Technology

Category:: Telecom

Package:: 28-QFN

Datasheet:: LE79271AMQC.pdf

Description:: IC TELECOM INTERFACE QFN28

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LE79271AMQC from Microchip Technology (acquired Microsemi) is a Next Generation Carrier Chipset (NGCC) Subscriber Line Interface Circuit (SLIC) designed for high-density, software-programmable POTS line interfaces in DSL-access systems. It delivers programmable AC/DC feed, 85 V_rms internal ringing, dual-battery operation, and integrated line diagnostics including leakage, loop resistance, capacitance, and foreign voltage sensing.

For engineers reviewing the LE79271AMQC datasheet, LE79271AMQC pinout, LE79271AMQC application, or LE79271AMQC equivalent, key selection criteria include GR-844-equivalent test validation, tip-open ground-start support, 5 REN with DC offset, metering at 12/16 kHz, and compatibility with Le79238 SLAC for full line interface implementation.

Technical Context

The LE79271AMQC implements a fully programmable two-wire line interface with independent current-limited DC feed decoupled from battery voltage, selectable off-hook/ground-key thresholds, and real-time monitoring of line voltage and current for voice, ringing, and diagnostics. Its architecture integrates a test load switch, smooth polarity reversal, and intelligent thermal management for dual-battery switching.

It supports balanced and unbalanced 85 V_rms ringing generation, GR-844-equivalent test primitives with guaranteed performance parameters, and interoperability with Le79238 SLAC to form a complete DSL-friendly line interface solution compliant with worldwide telephony standards.

Key Specifications

Parameter	Value and Actual Design Meaning
Ringing Voltage	85 V_rms internal - enables full-featured analog ringing without external transformer
REN	5 with DC offset - meets global subscriber line loading requirements including legacy POTS compatibility
Battery Support	Two negative + one positive supply - allows flexible power architecture and system-level power saving via automatic battery switching
Metering Frequencies	12 kHz and 16 kHz - supports standardized call-progress tone detection and billing metering
Line Diagnostics	Leakage, loop resistance, line/bell capacitance, foreign voltage - enables automated fault isolation without external test equipment
Signaling Mode	Tip-open ground-start - satisfies North American central office signaling requirements

Pinout & Package

LE79271AMQC is housed in a 64-pin QFN package (9 mm × 9 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Microchip's LE79271 datasheet Rev. 1.3 (2019), supporting differential line interface, battery connections, control I/O, and diagnostic monitoring paths.

Pin/Terminal	Circuit Role	Design Meaning
TIP, RING	Differential line interface terminals	Direct connection to telephone line pair; support bidirectional voice, ringing, and diagnostics
VBAT1, VBAT2, VBATP	Negative/positive battery supplies	Enable dual-negative-battery operation with automatic switching and thermal-aware sequencing
VRING	Ringing generator output	Delivers 85 V_rms balanced/unbalanced ringing; configurable via register settings
TESTLOAD	Integrated test load switch control	Activates internal 600 Ω test load for line diagnostics without external components
MONV, MONI	Analog monitor outputs	Provide real-time scaled representations of line voltage/current for host ADC sampling

Key Features

Feature	Design Value
GR-844-equivalent line testing	Fully validated test primitives and host routines ensure carrier-grade fault resolution without external test infrastructure
Programmable DC feed	Current-limited feed independent of battery voltage enables stable loop current across varying line conditions
Smooth polarity reversal	Eliminates audible click/noise during polarity-switching events required for metering and supervision
Integrated self-test capability	On-chip test load switch and diagnostic registers reduce BOM count and accelerate production test cycles
Intelligent thermal management	Dynamic battery switching and thermal monitoring prevent overheating during sustained ringing or high-current feed

Applications

DSL Access Multiplexer (DSLAM)	VoIP Gateway
Use Scenario: High-density line card in carrier-class DSLAM supporting 72-channel aggregation with Le79124 VCP. IC Role / Device Role / Timing Role: Primary SLIC providing programmable line feed, ringing, and GR-844-compliant diagnostics per channel. Use Value: Enables single-board deployment of 72 POTS lines with full regulatory test coverage and minimal external components.	Use Scenario: Analog telephony adapter (ATA) for enterprise VoIP gateways requiring POTS line emulation. IC Role / Device Role / Timing Role: SLIC handling off-hook detection, ring generation, and line supervision in hybrid IP-PSTN edge devices. Use Value: Supports ground-start signaling and 5 REN loading for compatibility with legacy PBX and CO switches.
Central Office Line Card	Remote Terminal Unit (RTU)
Use Scenario: Modular line card in Class 5 central office switch supporting GR-844 line testing and foreign voltage protection. IC Role / Device Role / Timing Role: Programmable SLIC delivering regulated DC feed, 85 V_rms ringing, and real-time line parameter monitoring. Use Value: Reduces need for discrete protection networks and external test instrumentation while meeting Telcordia requirements.	Use Scenario: Fiber-to-the-curb (FTTC) remote terminal serving multiple residential lines with battery backup. IC Role / Device Role / Timing Role: Dual-battery SLIC managing power cross detection, loop resistance measurement, and bell capacitance compensation. Use Value: Extends service uptime via automatic battery switchover and enables predictive maintenance using on-line diagnostics.

DSL Access Multiplexer (DSLAM)

VoIP Gateway

Use Scenario: High-density line card in carrier-class DSLAM supporting 72-channel aggregation with Le79124 VCP.

IC Role / Device Role / Timing Role: Primary SLIC providing programmable line feed, ringing, and GR-844-compliant diagnostics per channel.

Use Value: Enables single-board deployment of 72 POTS lines with full regulatory test coverage and minimal external components.

Use Scenario: Analog telephony adapter (ATA) for enterprise VoIP gateways requiring POTS line emulation.

IC Role / Device Role / Timing Role: SLIC handling off-hook detection, ring generation, and line supervision in hybrid IP-PSTN edge devices.

Use Value: Supports ground-start signaling and 5 REN loading for compatibility with legacy PBX and CO switches.

Central Office Line Card

Remote Terminal Unit (RTU)

Use Scenario: Modular line card in Class 5 central office switch supporting GR-844 line testing and foreign voltage protection.

IC Role / Device Role / Timing Role: Programmable SLIC delivering regulated DC feed, 85 V_rms ringing, and real-time line parameter monitoring.

Use Value: Reduces need for discrete protection networks and external test instrumentation while meeting Telcordia requirements.

Use Scenario: Fiber-to-the-curb (FTTC) remote terminal serving multiple residential lines with battery backup.

IC Role / Device Role / Timing Role: Dual-battery SLIC managing power cross detection, loop resistance measurement, and bell capacitance compensation.

Use Value: Extends service uptime via automatic battery switchover and enables predictive maintenance using on-line diagnostics.

Equivalent & Alternatives

The following parts are listed as comparable options for similar SLIC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LE79270AMQC	Lower ringing voltage (60 V_rms); no integrated test load switch; reduced diagnostic scope	Suitable for cost-sensitive deployments where GR-844 compliance is not required	Select LE79270AMQC only if 85 V_rms ringing and full line diagnostics are unnecessary
Si32260-A-GM	Single-battery operation; 70 V_rms ringing; different register map and I²C interface timing	Targeted at smaller-scale VoIP gateways and embedded ONU designs	Choose Si32260-A-GM when footprint and single-supply simplicity outweigh density and carrier-grade test needs

Compared with LE79271AMQC, LE79270AMQC trades ringing amplitude and diagnostic depth for lower cost, while Si32260-A-GM offers simpler integration at the expense of dual-battery support and GR-844 validation-making LE79271AMQC optimal for carrier-class, high-channel-count line cards requiring full regulatory test coverage.

Availability

LE79271AMQC is available at Aetrix Electronics and suitable for DSLAM line cards, VoIP gateways, central office equipment, and remote terminal units requiring stable component supply, long lifecycle support, and carrier-grade reliability.

Supply support for LE79271AMQC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology acquired Microsemi in 2018 and now owns the LE79271AMQC product line, delivering high-reliability analog and mixed-signal solutions for communications infrastructure.

The LE79271AMQC belongs to Microchip's NGCC (Next Generation Carrier Chipset) family, engineered specifically for software-programmable, high-density POTS line interfaces in carrier-grade access systems with full GR-844 compliance.

FAQ

What is the maximum ringing voltage supported by the LE79271AMQC?

The LE79271AMQC supports up to 85 V_rms internal ringing voltage in both balanced and unbalanced configurations. This specification is verified per GR-844 test procedures and enables direct replacement of traditional transformer-based ringing circuits. The LE79271AMQC achieves this using integrated high-voltage drivers and programmable waveform shaping, eliminating the need for external components in most deployments.

Does the LE79271AMQC support GR-844 equivalent line testing?

Yes, the LE79271AMQC includes fully validated GR-844-equivalent test primitives and host routines for leakage, loop resistance, capacitance, and foreign voltage detection. These capabilities are implemented in hardware and firmware, allowing automated fault isolation without external test equipment. The LE79271AMQC guarantees performance parameters aligned with Telcordia GR-844 requirements for carrier-grade line cards.

How does dual-battery operation work in the LE79271AMQC?

The LE79271AMQC supports two negative battery supplies (VBAT1, VBAT2) and one positive supply (VBATP), enabling automatic battery switching based on voltage level and thermal conditions. This feature extends system uptime during power transitions and reduces thermal stress. The LE79271AMQC manages sequencing and load balancing internally, requiring no external control logic-only proper PCB layout and decoupling per Microchip's layout guidelines.

Can the LE79271AMQC be used with the Le79238 SLAC device?

Yes, the LE79271AMQC is explicitly designed to operate with the Le79238 SLAC (Subscriber Line Audio Codec) device to form a complete DSL-friendly line interface. Together, they provide full analog front-end functionality-including voice path, signaling, diagnostics, and ringing-while maintaining software programmability. The LE79271AMQC handles line feed and high-voltage functions, while Le79238 manages audio codec and digital interface tasks.

What metering frequencies does the LE79271AMQC support?

The LE79271AMQC supports standardized metering at 12 kHz and 16 kHz, enabling accurate call-progress tone detection and billing pulse counting in POTS environments. Its smooth polarity reversal feature ensures silent transitions during metering events. This capability is built into the LE79271AMQC's analog front-end and requires no additional filtering or timing circuitry from the host system.

LE79271AMQC Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 28-QFN

Packaging:: Tray

Product Status:: Active

Function:: -

Interface:: 2-Wire

Number of Circuits:: -

Voltage - Supply:: -

Current - Supply:: -

Power (Watts):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-QFN

LE79271AMQC FAQ

1.How can I place an order for LE79271AMQC through Aetrix?

Please submit a Request for Quotation (RFQ) for LE79271AMQC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LE79271AMQC reliable?

The price and inventory of LE79271AMQC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE79271AMQC is usually 5 days.

3.What payment methods are accepted for LE79271AMQC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE79271AMQC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE79271AMQC?

LE79271AMQC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LE79271AMQC order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LE79271AMQC?

For technical support, including LE79271AMQC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE79271AMQC requirements.

6.How does Aetrix verify that LE79271AMQC is sourced from the original manufacturer or authorized distributors?

All LE79271AMQC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LE79271AMQC meets industry standards.

7.What is the process for return or replacement of LE79271AMQC?

All LE79271AMQC units undergo pre-shipment inspection (PSI). If there is an issue with LE79271AMQC, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LE79271AMQC part is unused and in its original packaging.

Return procedure for LE79271AMQC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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