LMK04111SQ/NOPB Texas Instruments Integrated Circuit (Quad Flat No-Lead) In Stock
LMK04111SQ/NOPB is a Texas Instruments 1.08 GHz dual-output low-noise clock synthesizer in a 48-pin WFQFN exposed-pad package targeting SDH and SONET applications. It provides two synchronized low-jitter clock outputs with an integrated PLL for network synchronization up to 1.08 GHz. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Quad Flat No-Lead
- Pin Count
- 49
- Lifecycle
- ACTIVE
- Datasheet
- LMK04111SQ/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $11.4200(MOQ 1000)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 1.08 GHz dual-output PLL clock synthesizer optimized for SDH and SONET network synchronization
- 48-pin WFQFN exposed-pad package with 0.28 mm sq pad for low thermal resistance in dense line-card layouts
- Integrated loop filter and VCO reduce external component count versus discrete PLL solutions
- Two simultaneous clock outputs enabling synchronized distribution to multiple downstream IC clocks
Applications
LMK04111SQ/NOPB is used in SONET/SDH line cards, optical transport network equipment, and wireless backhaul systems that require a low-jitter 1.08 GHz reference clock for framer and serializer ICs. Its dual outputs allow simultaneous clocking of a high-speed serializer and a framing processor from a single synthesizer, simplifying timing architecture in telecom shelf designs. The exposed-pad QFN package ensures adequate thermal dissipation in high-density blade chassis running continuous data traffic.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Applications | SDH; SONET |
| JESD-30 Code | S-PQCC-N48 |
| JESD-609 Code | e3 |
| Number of Channels | 2 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC48,.28SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| Telecom IC Type | ATM/SONET/SDH SUPPORT CIRCUIT |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LMK04111SQ/NOPB:
Frequently Asked Questions
What maximum output frequency does LMK04111SQ/NOPB support and which telecom standards does it target?
LMK04111SQ/NOPB operates up to 1.08 GHz on its dual clock outputs and is specifically characterized for SDH (Synchronous Digital Hierarchy) and SONET (Synchronous Optical Networking) applications. These telecom standards require precise reference frequencies such as 155.52 MHz, 622.08 MHz, and 1244.16 MHz, all of which fall within the device's output range.
How does the 48-pin WFQFN exposed-pad package of LMK04111SQ/NOPB benefit thermal management on a line-card PCB?
The exposed thermal pad on the 48-pin WFQFN package provides a direct solder contact to the PCB ground plane, dramatically reducing junction-to-board thermal resistance compared to standard QFN packages without a pad. For a clock synthesizer running PLL VCO circuitry continuously at 1.08 GHz, this lowers the die temperature by several degrees Celsius and improves phase noise floor stability across the operating temperature range.
For a SONET OC-48 add-drop multiplexer design, how many LMK04111SQ/NOPB devices are needed to clock 4 serializer channels simultaneously?
LMK04111SQ/NOPB provides 2 synchronized clock outputs per device. To drive 4 independent serializer channels at OC-48 rate (2.48832 Gbps, derived from a 622.08 MHz reference), a designer would need 2 LMK04111SQ/NOPB ICs, each clocking 2 serializer lanes. Alternatively, if all 4 serializers share a common clock domain, a single device with a 1-to-2 fanout buffer on each output can cover 4 channels.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1000+ | $11.4200 | $11420.00 |
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