My Inquiry
My Account
Texas Instruments LMK61E0-156M25SIAT
- Part No.:
- LMK61E0-156M25SIAT
- Manufacturer:
- Texas Instruments
- Category:
- Oscillators
- Package:
- 6-SMD Module
- Datasheet:
-
LMK61E0-156M25SIAT.pdf
- Description:
- SILIC OSC XO 156.2500MHZ LVPECL
- Quantity:
- Payment:
- Shipping:
Inventory:2,076
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMK61E0-156M25SIAT from Texas Instruments is an ultra-low-jitter LVPECL oscillator generating a fixed 156.25 MHz reference clock with ±25 ppm total frequency tolerance, 90 fs RMS typical phase jitter (fOUT > 100 MHz), and robust –70 dBc PSRR. It operates from a single 3.3 V supply in industrial temperature range (–40°C to +85°C) and serves as a high-stability timing source for FPGA and processor clocking in network infrastructure.
For engineers reviewing the LMK61E0-156M25SIAT datasheet, LMK61E0-156M25SIAT pinout, LMK61E0-156M25SIAT application, or LMK61E0-156M25SIAT equivalent, key selection criteria include its LVPECL output capability up to 1 GHz, 7 mm × 5 mm QFM package compatibility with industry-standard 7050 XO footprints, and factory-programmed 156.25 MHz frequency with no external configuration required.
Technical Context
The LMK61E0-156M25SIAT integrates a high-performance PLL-based oscillator core optimized for low-phase-noise operation at 156.25 MHz. Its internal power conditioning delivers –70 dBc PSRR across 50 kHz–1 MHz supply ripple frequencies, reducing sensitivity to board-level noise without external filtering.
It supports LVPECL output with 700–1200 mV differential swing, 120–200 ps rise/fall time, and 156.25 MHz phase noise floor of –165 dBc/Hz at 10 MHz offset. The OE pin provides LVCMOS-compatible output enable/disable control with 50 µs response time and internal pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 156.25 MHz - factory-programmed, no external tuning required; matches Ethernet 10GBase-R and PCIe Gen2/3 reference clocks. |
| Output Format | LVPECL - differential signaling compatible with high-speed SerDes receivers; requires 50 Ω termination to VCC–2 V. |
| RMS Phase Jitter (12 kHz–20 MHz) | 90 fs typical - meets stringent jitter budgets for 10G+ serial links and high-speed ADC/DAC sampling clocks. |
| Total Frequency Tolerance | ±25 ppm - includes initial calibration, temperature drift (–40°C to +85°C), supply variation, solder reflow, and 5-year aging at 40°C. |
| Supply Voltage | 3.3 V ±5% - single-rail operation simplifies power delivery; current draw 162–208 mA under LVPECL load. |
| PSRR | –70 dBc - suppresses power rail noise up to 1 MHz, enabling use on noisy digital power domains without dedicated LDO. |
| Package | 6-pin QFM (7.0 mm × 5.0 mm) - pin-compatible with standard 7050 XO footprint, enabling drop-in replacement of legacy oscillators. |
Pinout & Package
LMK61E0-156M25SIAT uses a 6-pin QFM (Quad Flat No-lead) package measuring 7.0 mm × 5.0 mm with exposed thermal pad. Pin 1 is marked by dot; pins are arranged in two rows (1–3 top, 4–6 bottom) with NC, OE, GND, OUTN, VDD, OUTP assignments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded die pad; must be left floating or tied to GND per layout guidelines - no electrical function. |
| 2 (OE) | Output Enable | LVCMOS input with internal pull-up; drives outputs to high-impedance when pulled low; 50 µs enable/disable latency. |
| 3 (GND) | Ground Reference | Primary analog/digital ground return; requires ≥3 thermal vias to inner ground plane for thermal reliability. |
| 4 (OUTN) | Differential Output (N) | LVPECL-compliant negative output; 700–1200 mV swing relative to OUTP; 120–200 ps edge rate. |
| 5 (VDD) | Power Supply | 3.3 V ±5% analog supply; bypassing requires 10 µF + 1 µF + 0.1 µF capacitors placed adjacent to pin. |
| 6 (OUTP) | Differential Output (P) | LVPECL-compliant positive output; forms 156.25 MHz differential pair with OUTN; common-mode voltage = VDD – 1.55 V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low jitter | 90 fs RMS typical (12 kHz–20 MHz) enables compliance with 10G Ethernet and PCIe Gen3 jitter masks. |
| High PSRR | –70 dBc rejection of 50 kHz–1 MHz supply noise eliminates need for dedicated low-noise LDO in system design. |
| Factory-programmed frequency | 156.25 MHz pre-configured at wafer test - no external programming interface or EEPROM required. |
| Industrial temperature range | Operates reliably from –40°C to +85°C ambient, supporting deployment in telecom line cards and baseband units. |
| Pin-compatible packaging | 7 mm × 5 mm QFM matches JEDEC MO-220 7050 XO standard, enabling direct PCB replacement of quartz-based oscillators. |
Applications
| 10G Ethernet Line Cards | FPGA Clock Distribution |
|---|---|
Use Scenario: Generating the primary 156.25 MHz reference clock for 10GBASE-R PHY transceivers in carrier-grade switches and routers. IC Role / Device Role / Timing Role: Ultra-low-jitter clock source meeting IEEE 802.3ae jitter limits for 10G serial data recovery. Use Value: 90 fs RMS jitter ensures bit-error-rate (BER) < 10−12 without additional jitter cleanup circuitry. |
Use Scenario: Providing clean, stable clock inputs to high-end FPGAs (e.g., Xilinx Ultrascale+, Intel Stratix 10) for high-speed I/O banks and transceiver blocks. IC Role / Device Role / Timing Role: Primary reference oscillator for FPGA transceivers operating at 10+ Gbps per lane. Use Value: ±25 ppm stability over temperature and life ensures reliable link training and long-term timing margin. |
| Server Baseboard Management | Medical Imaging Data Acquisition |
Use Scenario: Synchronizing BMC (Baseboard Management Controller) peripherals and PCIe root complexes in enterprise servers. IC Role / Device Role / Timing Role: System-level timing reference for out-of-band management and platform controller hub interfaces. Use Value: LVPECL output drives multiple loads with minimal skew; 3.3 V operation aligns with server motherboard power rails. |
Use Scenario: Clocking high-resolution ADCs and digital beamformers in ultrasound and MRI systems requiring deterministic sampling. IC Role / Device Role / Timing Role: Low-phase-noise master clock for precision analog-to-digital conversion and real-time signal processing. Use Value: –165 dBc/Hz phase noise floor at 10 MHz offset minimizes spectral smearing in narrowband RF receive paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMK61E2-156M25SIAT | ±50 ppm total frequency tolerance vs. ±25 ppm; otherwise identical pinout, package, and electrical specs. | Suitable for cost-sensitive applications where tighter aging and temperature stability are not required. | Select LMK61E2-156M25SIAT only if system-level timing budget allows ±50 ppm cumulative error. |
| Si5338A-B-GM | Programmable I²C-based clock generator (not fixed-frequency); 4-output, multi-format (LVDS/LVPECL/HCSL); higher power consumption. | Used where flexible frequency synthesis or multiple synchronized outputs are needed - not a drop-in replacement. | Choose Si5338A-B-GM only when programmability, multiple outputs, or frequency agility outweighs simplicity and jitter advantage of LMK61E0-156M25SIAT. |
Compared with LMK61E2-156M25SIAT, the LMK61E0-156M25SIAT delivers tighter frequency stability critical for telecom synchronization; compared with Si5338A-B-GM, it offers lower jitter and simpler integration but lacks programmability and multi-output capability.
Availability
LMK61E0-156M25SIAT is available at Aetrix Electronics and suitable for 10G Ethernet line cards, FPGA-based prototyping platforms, and medical imaging subsystems requiring stable component supply, guaranteed long-term availability, and traceable sourcing.
Supply support for LMK61E0-156M25SIAT 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and high-performance timing solutions for industrial, automotive, and communications markets.
The LMK61XX family was designed specifically to replace quartz-based oscillators in high-speed digital systems, delivering superior jitter performance, supply noise immunity, and seamless integration into space-constrained PCB layouts.
FAQ
What output format does the LMK61E0-156M25SIAT support?
The LMK61E0-156M25SIAT supports LVPECL output exclusively. It is factory-programmed for 156.25 MHz LVPECL operation with 700–1200 mV differential swing and VOS = VDD – 1.55 V. Unlike other members of the LMK61XX family, this variant does not support LVDS or HCSL output formats.
Does the LMK61E0-156M25SIAT require external configuration or programming?
No, the LMK61E0-156M25SIAT is fully factory-programmed for 156.25 MHz LVPECL operation and requires no external configuration, I²C interface, or EEPROM loading. It powers up and begins oscillating within 10 ms after VDD reaches 3.135 V, with output enabled by default due to the internal OE pull-up.
What is the thermal management requirement for LMK61E0-156M25SIAT?
The LMK61E0-156M25SIAT requires at least three 0.3-mm-diameter thermal vias connecting the exposed pad to the internal ground plane. Its junction-to-board thermal resistance (ψJB) is 37.7°C/W; with maximum on-chip power dissipation of 0.68 W, PCB temperature must stay ≤89°C to keep junction temperature within the LMK61X0-rated 115°C limit.
Can the LMK61E0-156M25SIAT be used as a direct replacement for a 7050-package crystal oscillator?
Yes - the LMK61E0-156M25SIAT uses a 7 mm × 5 mm 6-pin QFM package pin-compatible with industry-standard 7050 XO footprints. Its LVPECL output, 3.3 V supply, and OE control simplify migration from quartz-based oscillators without PCB redesign, provided load termination matches LVPECL requirements (50 Ω to VCC–2 V).
What is the recommended power supply decoupling for LMK61E0-156M25SIAT?
Texas Instruments recommends a three-capacitor decoupling network on the VDD pin: 10 µF (bulk), 1 µF (mid-frequency), and 0.1 µF (high-frequency), all placed as close as possible to the pin using 0201 or 0402 case sizes. Ground connections must use low-impedance paths to the PCB ground plane via multiple vias.
LMK61E0-156M25SIAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMK61XX
- Package/Case:
- 6-SMD Module
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Base Resonator:
- Silicon
- Type:
- XO (Standard)
- Frequency:
- 156.25 MHz
- Function:
- Enable/Disable
- Output:
- LVPECL
- Voltage - Supply:
- 3.3V
- Frequency Stability:
- ±25ppm
- Absolute Pull Range (APR):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Spread Spectrum Bandwidth:
- -
- Current - Supply (Max):
- 208mA
- Ratings:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-QFM (7x5)
- Size / Dimension:
- 0.276" L x 0.197" W (7.00mm x 5.00mm)
- Height - Seated (Max):
- 0.045" (1.15mm)
LMK61E0-156M25SIAT FAQ
1.How can I place an order for LMK61E0-156M25SIAT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMK61E0-156M25SIAT 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 LMK61E0-156M25SIAT reliable?
The price and inventory of LMK61E0-156M25SIAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMK61E0-156M25SIAT is usually 5 days.
3.What payment methods are accepted for LMK61E0-156M25SIAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMK61E0-156M25SIAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMK61E0-156M25SIAT?
LMK61E0-156M25SIAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMK61E0-156M25SIAT 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 LMK61E0-156M25SIAT?
For technical support, including LMK61E0-156M25SIAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMK61E0-156M25SIAT requirements.
6.How does Aetrix verify that LMK61E0-156M25SIAT is sourced from the original manufacturer or authorized distributors?
All LMK61E0-156M25SIAT 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 LMK61E0-156M25SIAT meets industry standards.
7.What is the process for return or replacement of LMK61E0-156M25SIAT?
All LMK61E0-156M25SIAT units undergo pre-shipment inspection (PSI). If there is an issue with LMK61E0-156M25SIAT, 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 LMK61E0-156M25SIAT part is unused and in its original packaging.
Return procedure for LMK61E0-156M25SIAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMK61E0-156M25SIAT Tags
-
ECS-2333-160-BN-TR
ECS Inc.
-
ECS-2333-240-BN-TR
ECS Inc.
-
KC2016Z25.0000C1KX00
KYOCERA AVX
-0.035-Thick.jpg)
-
ECS-2033-250-BN
ECS Inc.
-
O 25,0-JO32-B-1V3-1-T1-LF
Jauch Quartz
-
SIT1533AI-H4-DCC-32.768E
SiTime
-
ECS-2333-500-BN-TR
ECS Inc.
-
COM1305-50.000-EXT-T-TR
Raltron Electronics
-
SG-210STF 24.0000ML0
EPSON
-
ECS-3225MV-320-CN-TR
ECS Inc.
-
ECS-2033-240-BN
ECS Inc.
-
ECS-2333-120-BN-TR
ECS Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
