VC-708-ECW-KNXN-156M25000 Microchip Crystal or Oscillator (Other) In Stock
The VC-708-ECW-KNXN-156M25000 is a voltage-controlled crystal oscillator (VCXO) from Microchip outputting 156.25 MHz for precision clock synchronization in networking and telecom equipment. It delivers low-jitter performance with a LVCMOS/LVPECL-compatible output. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 6
- Lifecycle
- ACTIVE
- Category
- Crystal or Oscillator
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of VC-708-ECW-KNXN-156M25000?
- 156.25 MHz VCXO output frequency matches the standard Ethernet synchronization clock used in 1G and 10G optical transceiver designs
- Voltage-controlled tuning port enables fine frequency adjustment for Synchronous Ethernet (SyncE) and SONET/SDH clock recovery applications
- Low additive phase jitter output maintains sub-picosecond RMS jitter performance required by strict ITU-T G.8262 and G.811 synchronization standards
What is VC-708-ECW-KNXN-156M25000 used for?
The VC-708-ECW-KNXN-156M25000 is designed for line-side and system-side clock generation in Synchronous Ethernet (SyncE) switches, OTN transponders, and 10G/100G optical modules where a precise 156.25 MHz reference clock is mandatory. Its voltage-control input allows a phase-locked loop to steer the oscillator frequency across a defined pull range, enabling jitter attenuation and frequency holdover in ITU-T G.8262-compliant equipment. The oscillator also serves as a reference for serializer/deserializer (SerDes) PLLs and timing modules in data center leaf-and-spine switching fabrics.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the VC-708-ECW-KNXN-156M25000 datasheet?
VC-708-ECW-KNXN-156M25000 Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for VC-708-ECW-KNXN-156M25000?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Why is 156.25 MHz the standard output frequency for VC-708-ECW-KNXN-156M25000 in 10G Ethernet applications?
156.25 MHz is derived by dividing the 10GBASE-R line rate of 10.3125 Gbps by a factor of 66, matching the 64b/66b encoding overhead. Synchronous Ethernet equipment uses this 156.25 MHz reference to distribute a frequency-accurate clock across all ports, keeping each port's bit clock within the ±4.6 ppm ITU-T G.811 frequency accuracy mask required for primary reference clock traceability.
How does the voltage-control tuning port of VC-708-ECW-KNXN-156M25000 enable phase-locked loop operation in SyncE designs?
The VCXO tuning port accepts a DC control voltage—typically 0 V to 3.3 V—that shifts the output frequency across a defined pull range of ±50 ppm or wider depending on the VC-708 variant. A SyncE clock recovery IC drives this port via a DAC or analog loop filter, locking the 156.25 MHz output to an upstream recovered reference within the ±4.6 ppm G.811 mask and maintaining holdover accuracy of better than ±1 ppm over 24 hours when the upstream reference fails.
For a compact OTN transponder board, how does VC-708-ECW-KNXN-156M25000 compare to a standalone TCXO at the same frequency in terms of jitter performance?
A VCXO such as the VC-708 series achieves additive phase jitter of typically less than 0.1 ps RMS integrated from 12 kHz to 20 MHz, compared to 1–5 ps RMS for a general-purpose TCXO at 156.25 MHz. This 10× to 50× jitter advantage is critical for OTN FEC-decoded bit error rates, because SerDes receiver eye margins in 10G OTN require reference clocks with less than 0.5 ps RMS jitter to satisfy the ITU-T G.8251 OTN timing interface specification.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
More from Microchip
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”
You May Also Like
VG-4231CA 25.0000M-FGRC3
Epson Timing
Crystal or Oscillator
CX2016DB16000D0WZRC1
AVX
Crystal or Oscillator
ABS25-32.768KHZ-6-1-T
ABRACON
Crystal or Oscillator
ABS06-32.768KHZ-T
ABRACON
Crystal or Oscillator
ASTXR-12-38.400MHZ-514054-T
ABRACON
Crystal or Oscillator
SG-210STF 50.0000MS3
Epson Timing
Crystal or Oscillator
HCM4910000000ABJT
Citizen Finetech Miyota
Crystal or Oscillator
HCM4920000000ABJT
Citizen Finetech Miyota
Crystal or Oscillator
7A-25.000MAAJ-T
TXC
Crystal or Oscillator
ABM3-16.000MHZ-B4Y-T
ABRACON
Crystal or Oscillator
XRCGB27M120F3M10R0
Murata Electronics
Crystal or Oscillator
ABS25-32.000KHZ-T
ABRACON
Crystal or Oscillator
AIAC-1812-68NJ-T
ABRACON
Crystal or Oscillator
QC5CA8.00000F12B23M
QANTEK TECHNOLOGY CORPORATION
Crystal or Oscillator
CX2016DB20000D0FLJCC
AVX
Crystal or Oscillator
AB-557-03-HCHC-F-L-C-T
ABRACON
Crystal or Oscillator
CB3-3C-80M0000
CTS
Crystal or Oscillator
ABLS2-6.000MHZ-D4Y-T
ABRACON
Crystal or Oscillator
ECS-200-18-30BQ-DS
ECS
Crystal or Oscillator
ABMM-14.31818MHZ-B2-T
ABRACON
Crystal or Oscillator
ABMM-12.000MHZ-B2-T
ABRACON
Crystal or Oscillator
FA-238 25.0000MB-K3
Epson Timing
Crystal or Oscillator
FA-238 16.0000MB-C3
Epson Timing
Crystal or Oscillator
FA-238 25.0000MB-C3
Epson Timing
Crystal or Oscillator