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Microchip Technology EQCO875SC.3-TRAY
- Part No.:
- EQCO875SC.3-TRAY
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
EQCO875SC.3-TRAY.pdf
- Description:
- IC INTERFACE SPECIALIZED 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,506
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Product details
Overview
EQCO875SC.3-TRAY from Microchip Technology is a single-coax full-duplex transceiver IC for Fast Ethernet over 75Ω coax cable, integrating transmitter, receiver, and adaptive equalizer. It operates at 125 Mbps, supports FX-compliant PHYs, delivers up to 225 m range on RG11 cable, and consumes 62.5 mA from a single 3.3 V supply. It enables PoE-based power and data delivery over coax in IP camera links.
For engineers reviewing the EQCO875SC.3-TRAY datasheet, EQCO875SC.3-TRAY pinout, EQCO875SC.3-TRAY application, or EQCO875SC.3-TRAY equivalent, this page provides verified technical context, package mapping, real-world performance limits (e.g., 225 m on RG11), differential I/O interface details, and validated alternatives for coaxial Ethernet extension designs.
Technical Context
The EQCO875SC.3-TRAY implements an active signal splitter/combiner with integrated 75Ω output termination and adaptive analog equalizer core that auto-compensates for cable attenuation up to 10 dB at 62.5 MHz. Its input pre-driver accepts LVDS-like differential signals (SDIp/SDIn) with 110Ω on-chip termination and 100–200 mV turn-on threshold.
It uses SDIO/REF bidirectional coax interface with precise anti-phase current on REF matched to cable impedance, enabling hybrid subtraction of near-end transmit leakage. The device requires 4B/5B encoded, DC-balanced 125 Mbps input and outputs LVDS-compatible SDOp/SDOn signals with 250–450 mV amplitude and 150–350 ps rise time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 125 Mbps - Fixed Fast Ethernet line rate requiring 4B/5B encoding and DC-balanced input. |
| Cable Impedance | 75 Ω - Designed exclusively for 75Ω coax (RG6/RG11); not compatible with 50Ω systems. |
| Max Range | 225 m on RG11 - Verified maximum link distance under full-spec conditions per Table 1. |
| Supply Current | 62.5 mA typical - Total quiescent + active current draw from 3.3 V DVCC and AVCC rails. |
| Equalizer Function | Auto-adaptive analog filter - Converges in microseconds to compensate frequency-dependent cable loss without host configuration. |
| Output Interface | LVDS-compatible SDOp/SDOn - 100Ω differential output with 1.1–1.3 V common-mode voltage, directly connectable to standard LVDS receivers. |
| Operating Temp | −10°C to +70°C - Industrial ambient temperature range defined in Table 4-4. |
Pinout & Package
EQCO875SC.3-TRAY is housed in a 16-pin, 4 mm × 4 mm × 0.9 mm QFN package with 0.65 mm pitch and exposed thermal pad. Pin 1 is marked by a corner chamfer or dot; the GND tab connects to the exposed pad underneath.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power ground reference | Primary digital ground connection; must tie to system ground plane with low-inductance path. |
| DVCC (Pin 15) | Digital supply rail | +3.3 V supply for digital logic; requires 100 nF local decoupling to DGND. |
| DGND (Pin 13) | Digital ground return | Return path for DVCC and digital control pins (OPT0/OPT1/CLK/DAT); separate from AGND. |
| AVCC (Pin 1) | Analog supply rail | +3.3 V analog supply; must be filtered via ferrite bead and capacitor to coax shield (AGND). |
| AGND (Pin 3) | Analog ground / coax shield reference | Direct connection point to coax cable outer screen; critical for EMC and hybrid balance. |
| SDIO (Pin 2) | Bidirectional coax interface | Single-ended sum node carrying combined TX and RX signals; connects to center conductor of 75Ω coax. |
| REF (Pin 4) | Coax reference current sink | Carries anti-phase current to SDIO; must terminate via 75Ω resistor to AGND at connector. |
| SDIp/SDIn (Pins 10/9) | Differential RX input | LVDs-like input pair from PHY FX Out; internally terminated 110Ω differential, DC-biased to DGND. |
| SDOp/SDOn (Pins 12/11) | Differential TX output | LVDs-like output pair to PHY FX In; 100Ω differential output impedance, 250–450 mV swing. |
| OPT0/OPT1 (Pins 14/5) | Mode selection inputs | Fast Ethernet mode enabled when OPT0 = DGND and OPT1 = DVCC; hardwired during PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated equalizer core | Auto-adaptive analog filter compensates cable loss up to 10 dB at 62.5 MHz without software or register access. |
| Full-duplex coax interface | Simultaneous TX/RX over single 75Ω coax using active hybrid architecture-no external baluns or transformers required. |
| On-chip termination | 75Ω output termination and 110Ω differential input termination reduce external component count and improve signal integrity. |
| PoE-over-coax support | Enables concurrent delivery of 48 V DC power and 125 Mbps data over same coax cable using external inductor/capacitor network. |
| Industrial temperature operation | Rated for −10°C to +70°C ambient, validated across full voltage and jitter specifications per Table 4-4. |
Applications
| IP Camera Backhaul | Home Coax Networking |
|---|---|
|
Use Scenario: Extending 100BASE-FX Ethernet from NVR to remote HD security cameras over existing RG6 coax in residential or commercial buildings. IC Role / Device Role / Timing Role: Full-duplex physical medium dependent (PMD) layer transceiver converting PHY-level FX signals to coax domain with adaptive equalization. Use Value: Achieves 150 m reach on RG6 without repeaters, eliminates Cat5/Cat6 rewiring, and supports PoE delivery to camera via same coax. |
Use Scenario: Repurposing unused 75Ω coax infrastructure (e.g., legacy TV cabling) for home LAN connectivity where Ethernet cabling is impractical. IC Role / Device Role / Timing Role: Bidirectional Fast Ethernet bridge between router/switch PHY and coax medium, maintaining IEEE 802.3 timing compliance. Use Value: Enables 125 Mbps symmetric data transfer with sub-microsecond equalizer convergence-no firmware or host intervention needed. |
| STB-to-TV Inter-Room Link | Industrial Inspection Camera Link |
|
Use Scenario: Connecting set-top box to TV or PVR across rooms using in-wall coax, avoiding HDMI cable length limitations and signal degradation. IC Role / Device Role / Timing Role: Transparent Ethernet repeater operating at physical layer; preserves MAC-layer frame integrity and timing. Use Value: Delivers stable 100 Mbps link up to 225 m on RG11 with <50% peak-to-peak jitter (40% UI) - meets Fast Ethernet jitter budget. |
Use Scenario: Transmitting high-fidelity video from machine-vision or medical endoscope cameras over long coax runs in factory or clinical environments. IC Role / Device Role / Timing Role: Robust PMD transceiver with ESD-protected inputs and ferrite-filtered AVCC for noise immunity in electrically noisy settings. Use Value: Maintains >40 mV minimum RX input sensitivity after 150 m RG6 run, ensuring reliable link establishment without manual gain tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar coaxial Fast Ethernet transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EQCO850SC.3 | Optimized for 50Ω coax (RG58/RG174); 40–70 m max range; identical pinout and logic interface. | Used in test equipment, RF lab interconnects, and short-run 50Ω infrastructure-not suitable for 75Ω video coax. | Select EQCO850SC.3 only when deploying over certified 50Ω cables; do not substitute in 75Ω systems due to impedance mismatch and degraded return loss. |
| MAX24287 | Single-ended coax driver/receiver (not full-duplex); no integrated equalizer; requires external equalization or shorter runs. | Targeted at SDI video extension, not Ethernet; lacks 125 Mbps 4B/5B compliance and FX PHY interface. | Choose MAX24287 only for non-Ethernet, baseband video over coax; EQCO875SC.3-TRAY is required for standards-compliant Fast Ethernet extension. |
Compared with EQCO850SC.3 and MAX24287, EQCO875SC.3-TRAY uniquely delivers full-duplex 125 Mbps Fast Ethernet over 75Ω coax with embedded adaptive equalization-enabling drop-in replacement of twisted-pair infrastructure without modifying PHY layer or adding external equalizers.
Availability
EQCO875SC.3-TRAY is available at Aetrix Electronics and suitable for IP camera backhaul, home coax networking, STB-to-TV inter-room links, industrial inspection camera links, and PoE-over-coax deployments requiring stable component supply and long-term lifecycle continuity.
Supply support for EQCO875SC.3-TRAY 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 is a global semiconductor company specializing in microcontrollers, analog devices, and connectivity solutions, with broad industrial and automotive qualification coverage.
EQCO875SC.3-TRAY belongs to Microchip's Ethernet-over-Coax transceiver product line, designed specifically to extend Fast Ethernet over legacy 75Ω coax infrastructure while maintaining IEEE 802.3 compliance and supporting PoE delivery.
FAQ
What is the maximum supported cable length for EQCO875SC.3-TRAY on RG6 coax?
The EQCO875SC.3-TRAY supports up to 150 meters on RG6 coax cable (Ø 5 mm), as specified in Table 1 of the official DS60001314A datasheet. This range assumes standard installation with inline connectors and compliant 75Ω termination. Performance beyond 150 m is not guaranteed and depends on cable quality, shielding, and environmental noise.
Does EQCO875SC.3-TRAY require external configuration or firmware to operate?
No, EQCO875SC.3-TRAY operates autonomously with no external configuration or firmware required. Its adaptive equalizer converges automatically within microseconds upon valid signal detection, and Fast Ethernet mode is enabled by hardwiring OPT0 to DGND and OPT1 to DVCC-no serial interface or register access is needed for basic operation.
Can EQCO875SC.3-TRAY be used with 50Ω coax cable?
No, EQCO875SC.3-TRAY is strictly designed for 75Ω coax systems. Using it with 50Ω cable causes impedance mismatch, degrading return loss, increasing jitter, and reducing maximum range. For 50Ω applications, Microchip specifies the EQCO850SC.3 as the correct alternative part.
What power supply requirements does EQCO875SC.3-TRAY have?
EQCO875SC.3-TRAY requires two isolated 3.3 V supplies: DVCC (digital) and AVCC (analog). AVCC must be filtered through a ferrite bead and decoupled to AGND at the coax connector, while DVCC needs a 100 nF capacitor placed close to Pins 15 (DVCC) and 13 (DGND). Total supply current is 62.5 mA typical under full operation.
Is EQCO875SC.3-TRAY compatible with standard Fast Ethernet PHYs?
Yes, EQCO875SC.3-TRAY is fully compatible with any IEEE 802.3 FX-compliant PHY. It accepts LVDS-like differential input (SDIp/SDIn) and delivers LVDS-compatible differential output (SDOp/SDOn), with built-in termination and level adaptation-requiring only AC-coupling capacitors and proper impedance matching to integrate into existing PHY designs.
EQCO875SC.3-TRAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- Camera
- Interface:
- -
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 16-QFN (4x4)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
EQCO875SC.3-TRAY FAQ
1.How can I place an order for EQCO875SC.3-TRAY through Aetrix?
Please submit a Request for Quotation (RFQ) for EQCO875SC.3-TRAY 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 EQCO875SC.3-TRAY reliable?
The price and inventory of EQCO875SC.3-TRAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EQCO875SC.3-TRAY is usually 5 days.
3.What payment methods are accepted for EQCO875SC.3-TRAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EQCO875SC.3-TRAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EQCO875SC.3-TRAY?
EQCO875SC.3-TRAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EQCO875SC.3-TRAY 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 EQCO875SC.3-TRAY?
For technical support, including EQCO875SC.3-TRAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EQCO875SC.3-TRAY requirements.
6.How does Aetrix verify that EQCO875SC.3-TRAY is sourced from the original manufacturer or authorized distributors?
All EQCO875SC.3-TRAY 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 EQCO875SC.3-TRAY meets industry standards.
7.What is the process for return or replacement of EQCO875SC.3-TRAY?
All EQCO875SC.3-TRAY units undergo pre-shipment inspection (PSI). If there is an issue with EQCO875SC.3-TRAY, 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 EQCO875SC.3-TRAY part is unused and in its original packaging.
Return procedure for EQCO875SC.3-TRAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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