Microchip Technology LE87285NQC

Overview

LE87285NQC from Microsemi is a single-channel G.Fast line driver IC for home gateway DSL front-ends, supporting 106 MHz G.Fast, VDSL2 (17a/30a), and ADSL2+ signals with Class AB operation, fixed gain, and 5 programmable bias/standby states. It operates from a single supply and uses HV15 Bipolar SOI process for low power dissipation.

For engineers reviewing the LE87285NQC datasheet, LE87285NQC pinout, LE87285NQC application, or LE87285NQC equivalent, key selection factors include its 106 MHz bandwidth, QFN-16 RoHS-compliant package, programmable impedance-controlled disable/standby modes, single-supply operation, and absence of external gain resistors.

Technical Context

The LE87285NQC integrates two wideband amplifiers in a matched pair optimized for symmetric G.Fast transmission up to 106 MHz. Its HV15 Bipolar SOI process enables high linearity and thermal stability while maintaining Class AB efficiency.

Control logic accepts standard tri-state GPIO inputs to select among three preset bias levels or two impedance-controlled states (Disable and Standby), enabling dynamic power management without external level-shifting circuitry.

Key Specifications

Pinout & Package

LE87285NQC is housed in a 4 mm × 4 mm, 16-pin QFN package with exposed thermal pad (EP). Pin 1 marked by dot; pins numbered counterclockwise. Thermal pad must be soldered to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LE87286NQC and MAX2992ETJ+, the LE87285NQC provides optimal balance of single-channel integration, single-supply simplicity, and programmable low-power states-making it the preferred choice for new G.Fast/VDSL2/ADSL2+ gateway designs targeting compact form factor and thermal efficiency.

Availability

LE87285NQC is available at Aetrix Electronics and suitable for G.Fast home gateways, VDSL2 CPE terminals, and ADSL2+ routers requiring stable component supply throughout product lifecycle.

Supply support for LE87285NQC 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

Microsemi (now part of Microchip Technology) is a semiconductor company specializing in high-reliability analog, RF, and mixed-signal solutions for communications, aerospace, and industrial markets.

The LE87285NQC belongs to Microsemi's G.Fast line driver product line, engineered specifically for high-frequency DSL front-ends in space-constrained, thermally sensitive residential and small-office gateways.

FAQ

What is the maximum supported frequency of the LE87285NQC?

The LE87285NQC supports signals up to 106 MHz, fully compliant with the ITU-T G.9701 G.Fast standard. This bandwidth enables operation across all G.Fast tone plans, including the full 106 MHz profile used for 1 Gbps symmetric data rates over short copper loops. The device maintains specified linearity and harmonic distortion performance across this entire range.

Does the LE87285NQC require external gain-setting resistors?

No, the LE87285NQC features fixed internal gain architecture, eliminating the need for external gain resistors. This reduces bill-of-materials count, minimizes layout sensitivity to parasitic capacitance, and improves production yield consistency. All gain and bias settings are controlled internally via the EN0/EN1 state selection logic.

What power supply configuration does the LE87285NQC use?

The LE87285NQC operates from a single +12 V supply, simplifying power delivery compared to dual-supply line drivers. It draws typical quiescent current of 95 mA per channel in active mode, resulting in ~1.14 W total power dissipation under full G.Fast load conditions. The HV15 Bipolar SOI process ensures stable operation across temperature and voltage variations.

How many programmable operating states does the LE87285NQC support?

The LE87285NQC supports five distinct programmable states via its EN0 and EN1 control pins: three adjustable bias levels for performance/power trade-offs, plus impedance-controlled Disable and Standby modes that reduce line current to near-zero. These states are implemented using internal current sinks and high-impedance output buffers, requiring no external components.

Is the LE87285NQC RoHS-compliant and what package does it use?

Yes, the LE87285NQC is RoHS-compliant and packaged in a 4 mm × 4 mm, 16-pin QFN with exposed thermal pad. This green package meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and supports standard reflow profiles. The thermal pad must be soldered to a dedicated PCB ground plane for effective heat dissipation.