SG7050EEN 156.2500M-CJGA3 EPSON TOYOCOM Crystal or Oscillator (Other) In Stock
EPSON TOYOCOM SG7050EEN 156.2500M-CJGA3 is a 156.25 MHz surface-mount crystal oscillator (SPXO) with LVPECL differential output in a compact 7050 (7.0 mm x 5.0 mm) ceramic package. It is designed for high-speed communications timing in SONET/SDH and Ethernet applications requiring low phase-noise clock generation.
- Manufacturer
- EPSON TOYOCOM
- Package
- Other
- Pin Count
- 6
- Lifecycle
- ACTIVE
- Category
- Crystal or Oscillator
- Price
- From $15.0700(MOQ 50)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 156.25 MHz LVPECL differential output oscillator delivering precise clock reference for SONET OC-3 and Gigabit Ethernet PHY designs
- Compact 7050 SMD ceramic package (7.0 mm x 5.0 mm) enables tight PCB layout with minimal clock distribution trace length
- Low phase-noise SPXO architecture meets stringent jitter budgets in high-speed serial data links operating at multi-Gbps rates
Applications
The SG7050EEN 156.2500M-CJGA3 serves as a precision 156.25 MHz reference clock source in SONET/SDH line cards, Gigabit Ethernet switches, and optical transceiver modules that require a stable LVPECL clock with low phase noise. Its differential LVPECL output directly drives SerDes and CDR circuits in FPGAs, ASICs, and dedicated network processor devices without additional logic-level conversion. The oscillator is also used in test-and-measurement equipment and radar signal processing boards where a clean 156.25 MHz timing reference is needed for high-frequency data conversion.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Why does the SG7050EEN 156.2500M-CJGA3 use LVPECL output rather than CMOS for a 156.25 MHz clock distribution?
LVPECL (Low-Voltage Positive Emitter-Coupled Logic) is a differential output standard that swings approximately 800 mV differentially around a 3.3 V supply, enabling faster edge rates and superior noise immunity compared to single-ended CMOS at 156.25 MHz. This differential signaling cancels common-mode noise and reduces EMI radiation, which is critical in dense networking PCBs carrying multi-Gbps data alongside the clock distribution network.
Which networking standards specifically use a 156.25 MHz reference frequency, and why is this exact frequency chosen?
156.25 MHz is the line-rate byte clock for SONET OC-3 (155.52 Mbps) and serves as the 156.25 MHz reference for 1000BASE-X Gigabit Ethernet PHYs when operating with an 8B/10B-encoded 1.25 Gbps serial stream. The frequency is derived from the Gigabit Ethernet 125 MHz symbol rate scaled by 10/8 encoding overhead, making 156.25 MHz the natural recovered clock frequency in SerDes-based GbE link layers.
What phase-noise performance should a designer expect from the SG7050EEN oscillator at 156.25 MHz for a 10 Gbps SerDes reference?
Epson Toyocom SG7050EEN series oscillators are specified with phase noise typically better than -130 dBc/Hz at 10 kHz offset from a 156.25 MHz carrier. This translates to an integrated RMS jitter of well under 1 ps over a 12 kHz to 20 MHz integration bandwidth, meeting the reference clock jitter budget of most 10 Gbps SerDes receivers specified at less than 2 ps RMS.
How should a PCB designer terminate the LVPECL outputs of the SG7050EEN 156.2500M-CJGA3 to maintain signal integrity?
LVPECL outputs require DC termination to VCC minus 2 V (approximately 1.3 V for a 3.3 V supply). A common approach is a 50 ohm resistor from each differential output pin to a Thevenin equivalent formed by two resistors (130 ohm to VCC and 82 ohm to GND), providing the correct bias while matching the 50 ohm differential transmission line to prevent reflections at 156.25 MHz clock frequencies.
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About EPSON TOYOCOM
EPSON TOYOCOM is a leading electronic component manufacturer. FindMyChip sources EPSON TOYOCOM ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 50+ | $16.9900 | $849.50 |
| 100+ | $16.6000 | $1660.00 |
| 250+ | $15.0700 | $3767.50 |
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