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Microchip Technology EQCO875SC.3
- Part No.:
- EQCO875SC.3
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
EQCO875SC.3.pdf
- Description:
- IC INTERFACE SPECIALIZED 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,564
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Product details
Overview
EQCO875SC.3 from Microchip Technology is a single-coax bidirectional transceiver IC designed for full-duplex Fast Ethernet over 75Ω coax cable, supporting 125 Mbps data rate, 4B/5B encoding, and integrated adaptive equalization with up to 225 m range on RG11 cable. It interfaces directly with IEEE 802.3 FX-compliant PHYs and enables PoE-based power/data delivery over coax.
For engineers reviewing the EQCO875SC.3 datasheet, EQCO875SC.3 pinout, EQCO875SC.3 application, or EQCO875SC.3 equivalent, key selection considerations include its 75Ω coax impedance matching, 16-pin QFN package, 3.3V supply operation, auto-adaptive equalizer core, and compatibility with surveillance camera networks requiring long-reach Ethernet-over-coax solutions.
Technical Context
The EQCO875SC.3 integrates an active signal splitter/combiner with precise 75Ω output termination and an embedded time-continuous feedback equalizer that adapts within microseconds to restore frequency response degraded by coax attenuation. Its input pre-driver normalizes amplitude and slew rate from FX PHY outputs before transmission.
Signal paths are strictly segregated: SDIp/SDIn accept differential LVDS-like inputs (110Ω on-chip termination), SDIO/REF interface the coax center conductor and shield with matched impedance referencing, and SDOp/SDOn deliver reconstructed LVDS-like outputs (350 mV typical amplitude, 240 ps typical rise time) to the PHY's RX pair.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 125 Mbps - matches Fast Ethernet FX physical layer timing and 4B/5B encoded bitstream requirements. |
| Cable Impedance | 75Ω - requires exact match to RG6/RG11 coax; mismatch degrades return loss and hybrid cancellation performance. |
| Max Range | 225 m on RG11 - achievable only with adaptive equalization compensating for high-frequency attenuation in long coax runs. |
| Supply Voltage | 3.3 V ±3% - powers both analog (AVCC) and digital (DVCC) domains; AVCC must be ferrite-bead filtered for EMC. |
| Power Dissipation | 205 mW - enables thermal management in compact 4×4 mm QFN without heatsinking under full duplex operation. |
| Operating Temp | −10°C to +70°C - industrial-grade ambient range suitable for indoor/outdoor security camera enclosures. |
| Jitter Tolerance | ≤50% UI peak-to-peak - ensures reliable clock recovery at receiver after coax-induced distortion and equalization. |
Pinout & Package
16-pin, 0.65 mm pitch, 4 mm × 4 mm × 0.9 mm body QFN package with exposed thermal pad (Microchip drawing C04-259B). Pin 1 marked by hatched corner; GND tab thermally and electrically connected to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13, 15, GND TAB | Ground Reference | Digital and analog grounds separated internally; AGND must connect directly to coax connector shield for optimal EMI suppression. |
| 2 (AGND), 13 (DGND) | Analog/Digital Ground | AGND ties to coax outer screen; DGND references digital logic; separation prevents noise coupling into equalizer core. |
| 3 (SDIO), 4 (REF) | Coax Interface Pair | SDIO carries summed near/far-end signals; REF supplies anti-phase current-both require 75Ω impedance-matched routing to coax connector. |
| 10, 9 (SDIp/SDIn) | Differential PHY Input | Accepts FX PHY transmit output; 110Ω on-chip termination eliminates external resistors; ESD-protected and wake-up enabled. |
| 12, 11 (SDOp/SDOn) | Differential PHY Output | Delivers equalized far-end signal to PHY RX; LVDS-compatible (350 mV swing, 100Ω differential) with no level-shifting needed. |
| 14, 5 (OPT0/OPT1) | Mode Configuration | Fast Ethernet mode enabled by OPT0→DGND and OPT1→DVCC; floating or incorrect bias disables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Adaptive Equalizer | Auto-compensates coax attenuation up to 10 dB @ 62.5 MHz using real-time feedback-no firmware or host intervention required. |
| Single-Coax Full-Duplex | Eliminates separate TX/RX cables; uses hybrid circuitry to separate near-end transmit from far-end receive on one 75Ω line. |
| On-Chip Termination | 75Ω coax termination and 110Ω differential input termination reduce BOM count and layout sensitivity versus discrete resistor networks. |
| PoE over Coax Support | Enables simultaneous 48 V DC power and 125 Mbps data on same coax-reduces cabling cost in IP camera deployments. |
| LVDS-Compatible I/O | SDIp/SDIn and SDOp/SDOn meet LVDS voltage thresholds and drive strength-direct connection to standard FX PHYs without level shifters. |
Applications
| IP Camera Backhaul | Home Coax Networking |
|---|---|
Use Scenario: Connecting remote HD IP security cameras to NVR over existing RG6 coax in residential or commercial buildings. IC Role / Device Role / Timing Role: Full-duplex transceiver enabling bidirectional 125 Mbps Fast Ethernet traffic while extracting power from coax for PoE-powered cameras. Use Value: Achieves 150 m reach on RG6 without repeaters-replaces Cat5e cabling where retrofitting is impractical or costly. | Use Scenario: Repurposing unused 75Ω coax TV infrastructure for Ethernet connectivity between STBs, PVRs, and gateways. IC Role / Device Role / Timing Role: Physical layer transceiver converting FX PHY signals to coax PMD compliant with IEEE 802.3 clause 30 extensions. Use Value: Delivers deterministic 125 Mbps throughput with <50% UI jitter-supports streaming 4K video across rooms without new wiring. |
| Industrial Inspection Link | Medical Imaging Transport |
Use Scenario: High-reliability Ethernet link between machine vision cameras and controllers in factory automation environments. IC Role / Device Role / Timing Role: Coax transceiver providing EMI-immune data transport with adaptive equalization to maintain signal integrity amid motor drives and RF noise. Use Value: Maintains <40 mV minimum RX input sensitivity after 225 m on low-loss RG11-ensures error-free frame capture in critical inspection systems. | Use Scenario: Transmitting uncompressed endoscopic video from surgical cameras to display/processing units in ORs. IC Role / Device Role / Timing Role: Low-jitter, low-latency transceiver supporting deterministic 125 Mbps transport with guaranteed 225 m range on medical-grade coax. Use Value: Enables zero-frame-loss video streaming with <50% UI jitter-meets real-time latency and reliability requirements for live surgical guidance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar coaxial 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 but different impedance network calibration. | Suitable for short-run industrial control links over 50Ω test cables-not for 75Ω broadcast infrastructure. | Select EQCO850SC.3 only when deploying on legacy 50Ω coax; EQCO875SC.3 is not interchangeable due to impedance-specific internal termination. |
| MAX24287 | Supports 10/100BASE-T1 automotive Ethernet over single twisted pair; no coax equalization; requires external magnetics and different PHY interface. | Designed for automotive ECU links per ISO 10605; lacks PoE-over-coax capability and adaptive coax equalization. | MAX24287 addresses automotive EMC requirements but cannot replace EQCO875SC.3 in coax-based surveillance or home networking. |
Compared with EQCO850SC.3 and MAX24287, the EQCO875SC.3 uniquely delivers adaptive 75Ω coax equalization, integrated PoE support, and FX PHY compatibility-making it the only solution for cost-sensitive, long-reach IP camera backhaul over existing coax infrastructure.
Availability
EQCO875SC.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 EQCO875SC.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.
The EQCO875SC.3 belongs to Microchip's Ethernet-over-coax transceiver product line, engineered specifically to extend Fast Ethernet over legacy 75Ω coax infrastructure while enabling PoE delivery-targeting security, broadcast, and industrial video markets.
FAQ
What is the maximum supported cable length for EQCO875SC.3 on RG6 coax?
The EQCO875SC.3 achieves up to 150 meters on RG6 coax cable, as specified in Table 1 of the DS60001314A datasheet. This range assumes proper 75Ω impedance matching, correct REF termination, and use of high-quality RG6 with solid copper center conductor and foil+braided shield. Performance may degrade with substandard cable or poor PCB layout near the coax connector.
Does EQCO875SC.3 require external termination resistors for the coax interface?
No, the EQCO875SC.3 integrates precise 75Ω output termination for the coax interface. External resistors are unnecessary for SDIO/REF-only a 75Ω resistor connecting REF to AGND at the coax connector is required per Figure 3-2. The device's internal termination eliminates discrete components and improves return-loss consistency across production units.
Can EQCO875SC.3 operate with a 2.5V supply instead of 3.3V?
No, the EQCO875SC.3 requires a nominal 3.3V supply with tolerance of ±3% (3.2–3.4V), as defined in Table 4-2 of the datasheet. Operation outside this range risks failure of the analog equalizer core and LVDS I/O drivers. DVCC and AVCC must both be supplied at 3.3V; AVCC additionally requires ferrite-bead filtering to suppress switching noise.
How does the EQCO875SC.3 handle power-over-coax (PoC) functionality?
The EQCO875SC.3 supports PoC by allowing 48V DC to be injected onto the coax alongside data-its SDIO/REF interface is AC-coupled, and internal circuitry isolates DC power from signal paths. An external inductor (e.g., Coilcraft 1812PS-103KLB) and capacitor network (L1/C10 in Figure 3-1) are required to separate power from data at the board level; EQCO875SC.3 itself does not regulate or convert PoC voltage.
Is EQCO875SC.3 pin-compatible with EQCO875SC.2?
Yes, according to Note 1 in Figure 1-2 of the datasheet, EQCO875SC.2 devices are functionally identical to EQCO875SC.3 in all aspects and may be used interchangeably. Both share identical pinout, electrical characteristics, package dimensions, and thermal specifications-making EQCO875SC.2 a valid drop-in replacement if EQCO875SC.3 is unavailable.
EQCO875SC.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Camera
- Interface:
- -
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 16-QFN (4x4)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
EQCO875SC.3 FAQ
1.How can I place an order for EQCO875SC.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for EQCO875SC.3 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 reliable?
The price and inventory of EQCO875SC.3 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 is usually 5 days.
3.What payment methods are accepted for EQCO875SC.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EQCO875SC.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EQCO875SC.3?
EQCO875SC.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EQCO875SC.3 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?
For technical support, including EQCO875SC.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EQCO875SC.3 requirements.
6.How does Aetrix verify that EQCO875SC.3 is sourced from the original manufacturer or authorized distributors?
All EQCO875SC.3 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 meets industry standards.
7.What is the process for return or replacement of EQCO875SC.3?
All EQCO875SC.3 units undergo pre-shipment inspection (PSI). If there is an issue with EQCO875SC.3, 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 part is unused and in its original packaging.
Return procedure for EQCO875SC.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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