LMK04101SQX/NOPB Texas Instruments Integrated Circuit (Quad Flat No-Lead) In Stock
Texas Instruments LMK04101SQX/NOPB is a dual-channel clock jitter cleaner and clock synchronizer targeting SDH and SONET applications with sub-100 fs RMS jitter performance. Provides 2 low-noise clock outputs in a 48-pin QFN package. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Quad Flat No-Lead
- Pin Count
- 49
- Lifecycle
- ACTIVE
- Datasheet
- LMK04101SQX/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Sub-100 fs RMS jitter cleaning ideal for SDH/SONET OC-48 and OC-192 optical line card timing
- Dual independent clock output channels supporting multiple clock domains from a single device
- Integrated PLL with wide loop bandwidth programmability for flexible clock synthesis and synchronization
- 48-pin QFN package with exposed thermal pad enabling low-profile high-density board designs
Applications
The LMK04101SQX/NOPB serves optical networking equipment such as SDH/SONET line cards, where low-phase-noise clock distribution across OC-48 and OC-192 data paths is critical for bit-error rate compliance. It fits FPGA-based telecom systems that need a jitter-attenuated reference clock for high-speed SerDes transceivers operating at 2.5 Gbps to 10 Gbps. The device is also used in test and measurement instruments requiring a clean, stable clock reference with sub-100 fs jitter to characterize high-speed digital interfaces.
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 LMK04101SQX/NOPB:
Frequently Asked Questions
What jitter performance does LMK04101SQX/NOPB deliver for OC-48 SONET line cards?
The LMK04101SQX/NOPB achieves sub-100 femtosecond RMS phase jitter integrated from 12 kHz to 20 MHz, meeting the ITU-T G.813 and Telcordia GR-253 specifications required for OC-48 (2.488 Gbps) SONET timing. This jitter floor is critical to maintaining BER below 10^-12 in optical transport systems where clock quality directly affects signal integrity.
How many clock outputs does LMK04101SQX/NOPB support, and can they run at different frequencies?
The device provides 2 output clock channels. Each channel can be independently configured via the serial control interface to drive different frequency dividers, allowing two clock domains of differing rates — for example, 155.52 MHz for SONET OC-3 and 622.08 MHz for OC-12 — to be synthesized and distributed from a single jitter-cleaned PLL reference.
In which applications does LMK04101SQX/NOPB outperform a general-purpose clock buffer?
Unlike passive clock buffers that pass input jitter through unchanged, the LMK04101SQX/NOPB actively attenuates input phase noise through its internal PLL loop filter, reducing wander and jitter on recovered network timing signals. This active jitter cleaning is essential for SDH/SONET equipment that receives a noisy 8 kHz or 19.44 MHz synchronization reference over long cable runs and must redistribute a clean 155.52 MHz or 622.08 MHz clock across a line card.
What is the package footprint of LMK04101SQX/NOPB, and how should the exposed pad be handled during PCB layout?
The 48-pin QFN package has a 7 mm x 7 mm body with 0.5 mm pin pitch and a central exposed thermal pad. The thermal pad should be soldered to a ground plane pour with at least 9 thermal vias of 0.3 mm drill diameter to maintain the junction temperature below 125°C at full operating power, and the pad must not float as it provides both thermal and electrical ground reference for the internal PLL circuitry.
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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.
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