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Microchip Technology EQCO850SC.3-TRAY
- Part No.:
- EQCO850SC.3-TRAY
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
EQCO850SC.3-TRAY.pdf
- Description:
- IC INTERFACE SPECIALIZED 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
EQCO850SC.3 from Microchip Technology is a single-coax full-duplex transceiver IC for Fast Ethernet over 50Ω coaxial cable, supporting 125 Mbps data rate, integrated equalizer and PoE-compatible power/data distribution, with 205 mW power consumption from 3.3V supply - used in IP camera links and coax-based home networking.
For engineers reviewing the EQCO850SC.3 datasheet, EQCO850SC.3 pinout, EQCO850SC.3 application, or EQCO850SC.3 equivalent, this page delivers verified electrical specs, QFN-16 package layout guidance, coax impedance matching requirements (50Ω), LVDS-compatible I/O interface details, and real-world range performance (up to 70 m on RG58/RG174).
Technical Context
The EQCO850SC.3 implements an active signal splitter/combiner with auto-adaptive analog equalization in the receive path, enabling simultaneous bidirectional transmission over one coax cable. It accepts FX-compliant differential inputs (SDIp/SDIn), processes signals through a 4B/5B–aware equalizer core, and outputs reconstructed LVDS-level signals (SDOp/SDOn) with variable gain compensation for cable attenuation.
Its architecture integrates on-chip 110Ω differential input termination, 75Ω/50Ω configurable output impedance (RSDIO = 46–55Ω typical for EQCO850SC.3), and precise REF current mirroring to AGND for hybrid subtraction - all optimized for operation within -10°C to +70°C ambient temperature and 125 Mbps bit rate with PRBS7 jitter <50% UI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 125 Mbps - matches IEEE 802.3 FX physical layer timing for Fast Ethernet interoperability. |
| Cable Impedance | 50Ω - requires matched 50Ω coax (RG58, RG174, RTK); RSDIO = 46–55Ω ensures minimal return loss. |
| Supply Voltage | 3.2–3.4 V - tight 3.3V ±3% tolerance enables stable operation with standard LDOs. |
| Power Consumption | 205 mW - total active supply current 47.5–75.5 mA supports low-thermal industrial deployments. |
| Operating Temp | -10°C to +70°C - industrial-grade ambient range suitable for outdoor camera enclosures and STB environments. |
| Equalizer Bandwidth | Up to 62.5 MHz - compensates frequency-dependent attenuation in 50Ω coax up to 70 m (RG58/RTK). |
| Output Interface | LVDS-compatible SDOp/SDOn - 250–450 mV differential swing, 100Ω differential termination, 150–350 ps rise time. |
| Junction Temp Limit | 85°C max - thermal resistance θJA = 59°C/W allows PCB-level thermal design without forced air. |
Pinout & Package
16-pin QFN package (4 mm × 4 mm × 0.9 mm body, 0.65 mm pitch), thermally enhanced with exposed pad (GND TAB). Pin 1 marked by top-side notch or dot; pin numbering follows standard counter-clockwise sequence from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13, 15, GND TAB | Ground | Digital/analog/power ground reference; GND TAB must be soldered to large copper pour for thermal and EMI control. |
| 15 (DVCC), 13 (DGND) | Digital Power | +3.3V digital supply and return; decoupled locally with 100 nF capacitor between DVCC and DGND. |
| 1 (AVCC), 4 (AGND) | Analog Power | +3.3V analog supply filtered via ferrite bead; AGND tied directly to coax shield at connector for noise isolation. |
| 2 (SDIO), 3 (REF) | Coax Interface | SDIO carries combined TX+RX signal; REF provides anti-phase current to AGND via 50Ω resistor for hybrid subtraction. |
| 10,9 (SDIp/SDIn) | Differential Input | LVDS-like FX PHY receive pair; internally terminated 85–115Ω differential, ESD-protected, DC-biased to DGND. |
| 12,11 (SDOp/SDOn) | Differential Output | LVDS-level reconstructed far-end signal; 85–115Ω on-chip termination, compatible with standard LVDS receivers. |
| 14,5 (OPT0, OPT1) | Mode Control | Fast Ethernet mode enabled when OPT0 = DGND and OPT1 = DVCC; no external pull-up/down required. |
| 6,7 (CLK, DAT), 8 (NC) | Test/Reserved | Production test pins; connect CLK/DAT to DGND for normal operation; NC must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Equalizer Core | Auto-adaptive analog filter converges in microseconds to compensate 50Ω coax attenuation up to 10 dB @ 62.5 MHz. |
| Single-Cable Full-Duplex | Eliminates separate TX/RX cables - enables cost-effective retrofit of legacy 50Ω coax infrastructure for Ethernet extension. |
| PoE-over-Coax Support | Enables concurrent 48V DC power and 125 Mbps data delivery over same RG58/RG174 cable using external inductor (L1). |
| On-Chip Termination | Reduces BOM count: internal 110Ω SDIp/SDIn termination, 50Ω-matched RSDIO, and biasing resistors eliminate 6+ discrete parts. |
| QFN-16 Thermal Design | Exposed thermal pad and low θJA (59°C/W) allow operation at full speed in sealed enclosures without heatsinks. |
Applications
| IP Camera Backhaul | Home Coax Networking |
|---|---|
|
Use Scenario: Connecting PoE-enabled security cameras to NVR over existing RG58 coax in residential or commercial buildings. IC Role / Device Role / Timing Role: Full-duplex transceiver handling both 125 Mbps upstream video and downstream control signaling on single 50Ω coax. Use Value: Achieves up to 70 m range on RG58 - avoids Cat5 rewiring while preserving Fast Ethernet latency and jitter compliance (<50% UI). |
Use Scenario: Extending Ethernet connectivity between STB, TV, and PVR across rooms using unused 50Ω coax drops. IC Role / Device Role / Timing Role: Physical layer translator converting FX PHY signals to coax PMD compliant with IEEE 802.3 Clause 30. Use Value: Enables plug-and-play Ethernet over coax without modifying wall outlets or installing new cabling infrastructure. |
| Industrial Inspection Link | Medical Imaging Transport |
|
Use Scenario: High-reliability video link from machine-vision camera to controller in factory automation systems. IC Role / Device Role / Timing Role: Robust coax transceiver operating at -10°C to +70°C with integrated ESD protection on all I/O pins. Use Value: Maintains 125 Mbps throughput over 40 m on thin RG174 coax - ideal for tight-space robotic arm routing. |
Use Scenario: Transmitting uncompressed endoscope video from probe head to processing unit in medical devices. IC Role / Device Role / Timing Role: Low-jitter, low-power transceiver ensuring deterministic latency and signal integrity for real-time imaging. Use Value: Delivers <40 mV RX sensitivity and adaptive equalization - recovers degraded signals from long coax runs inside sterilized enclosures. |
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 |
|---|---|---|---|
| EQCO875SC.3 | Optimized for 75Ω coax (RG6/RG11); higher range (150–225 m); RSDIO = 72–78Ω; identical pinout and logic interface. | Used in analog TV coax infrastructure where 75Ω is standard; not suitable for 50Ω RF-grade coax systems. | Select EQCO875SC.3 only when deploying over legacy 75Ω broadcast coax; EQCO850SC.3 is mandatory for 50Ω installations. |
| MAX24287 | Single-ended coax driver/receiver; no integrated equalizer; requires external equalization circuitry; 3.3V/5V dual-supply capable. | Targeted at lower-cost, shorter-range (<25 m) coax links where adaptive equalization is unnecessary. | Choose MAX24287 for cost-sensitive, fixed-length coax runs; EQCO850SC.3 preferred when cable length varies or signal integrity is critical. |
Compared with EQCO875SC.3, the EQCO850SC.3 delivers matched 50Ω impedance and shorter-range optimization, while MAX24287 lacks embedded equalization - making EQCO850SC.3 the only solution supporting adaptive compensation over variable-length 50Ω coax up to 70 m.
Availability
EQCO850SC.3 is available at Aetrix Electronics and suitable for IP camera backhaul, home coax networking, industrial inspection links, and medical imaging transport requiring stable component supply across extended product lifecycles.
Supply support for EQCO850SC.3 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and connectivity solutions, with ISO/TS 16949-certified manufacturing and global technical support.
The EQCO850SC.3 belongs to Microchip's Ethernet-over-Coax transceiver product line, designed specifically to enable Fast Ethernet extension over legacy 50Ω coax infrastructure in security, broadcast, and industrial markets.
FAQ
What is the maximum supported coax cable length for EQCO850SC.3?
The EQCO850SC.3 achieves up to 70 meters on RG58 and RTK coax cables, and 40 meters on RG174, as confirmed in Table 2 of DS60001314A. Performance depends on cable quality, termination accuracy, and environmental noise; actual range may vary with 50Ω impedance mismatch or poor shielding. EQCO850SC.3 uses adaptive equalization to maintain signal integrity within these limits.
Does EQCO850SC.3 support Power over Coax (PoC)?
Yes, EQCO850SC.3 fully supports PoE-based power and data distribution over coax, as stated in its Features section. An external 1812PS-103KLB inductor (L1) and capacitor (C10) are required to isolate DC power from the AC data path. The IC itself handles signal coupling while maintaining 125 Mbps throughput - no firmware or configuration changes needed for PoC operation.
What is the function of the REF pin on EQCO850SC.3?
The REF pin on EQCO850SC.3 carries a precise anti-phase current to the transmit current on SDIO, enabling hybrid subtraction of the near-end signal to extract the far-end received signal. It must be connected via a 50Ω resistor directly to AGND at the coax connector - not to system ground - to preserve return-loss performance and ensure proper equalizer operation.
Can EQCO850SC.3 be used with standard Fast Ethernet PHYs?
Yes, EQCO850SC.3 connects seamlessly to any FX-compliant physical layer controller (PHY), as confirmed in Section 1.0 of DS60001314A. Its SDIp/SDIn inputs accept LVDS-like differential signals, and SDOp/SDOn outputs drive standard LVDS receivers - requiring only capacitive coupling and proper common-mode voltage alignment per the application circuit in Figure 3-1.
Is EQCO850SC.3 pin-compatible with EQCO875SC.3?
Yes, EQCO850SC.3 and EQCO875SC.3 share identical 16-pin QFN packaging, pinout, and logic-level interface - differing only in internal impedance tuning (50Ω vs. 75Ω) and equalizer calibration. Both use the same OPT0/OPT1 configuration for Fast Ethernet mode and require identical PCB layout practices, except for trace impedance (50Ω vs. 75Ω) and termination resistor value (50Ω vs. 75Ω).
EQCO850SC.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
EQCO850SC.3-TRAY FAQ
1.How can I place an order for EQCO850SC.3-TRAY through Aetrix?
Please submit a Request for Quotation (RFQ) for EQCO850SC.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 EQCO850SC.3-TRAY reliable?
The price and inventory of EQCO850SC.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 EQCO850SC.3-TRAY is usually 5 days.
3.What payment methods are accepted for EQCO850SC.3-TRAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EQCO850SC.3-TRAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EQCO850SC.3-TRAY?
EQCO850SC.3-TRAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EQCO850SC.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 EQCO850SC.3-TRAY?
For technical support, including EQCO850SC.3-TRAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EQCO850SC.3-TRAY requirements.
6.How does Aetrix verify that EQCO850SC.3-TRAY is sourced from the original manufacturer or authorized distributors?
All EQCO850SC.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 EQCO850SC.3-TRAY meets industry standards.
7.What is the process for return or replacement of EQCO850SC.3-TRAY?
All EQCO850SC.3-TRAY units undergo pre-shipment inspection (PSI). If there is an issue with EQCO850SC.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 EQCO850SC.3-TRAY part is unused and in its original packaging.
Return procedure for EQCO850SC.3-TRAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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