511ABA000278AAG LVPECL Oscillator Equivalent & Substitute Parts

Part Overview

The 511ABA000278AAG is a 156.253906 MHz XO (Standard) LVPECL oscillator manufactured by Skyworks Solutions Inc. operating at 3.3V with Enable/Disable functionality. This crystal-based oscillator is designed for applications requiring precise frequency generation with low-voltage positive emitter-coupled logic output. The part is currently Active in product status with 737 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required for design flexibility, supply chain alternatives, or inventory management.

Substiute Parts

511ABA000278AAG

Skyworks Solutions Inc.In Stock: 780511ABA000278AAG Datasheet

Current PartRFQ

SIT9121AI-1D2-33E156.253906T

SiTimeIn Stock: 1008SIT9121AI-1D2-33E156.253906T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 511ABA000278AAG is determined by strict equivalence across the following critical parameters:

• Frequency Match: 156.253906 MHz (exact)
• Output Logic: LVPECL (required for signal compatibility)
• Supply Voltage: 3.3V (required for power compatibility)
• Enable/Disable Function: Present (required for circuit control)
• Frequency Stability: ±25ppm (required for timing accuracy)
• Operating Temperature Range: -40°C ~ 85°C (required for environmental compatibility)
• Package / Case: 6-SMD, No Lead (required for PCB footprint compatibility)
• Mounting Type: Surface Mount (required for assembly compatibility)
• Physical Dimensions: 0.276" L x 0.197" W (7.00mm x 5.00mm) (required for board layout compatibility)
• RoHS Compliance: ROHS3 Compliant (required for regulatory compliance)
• MSL Rating: 1 (Unlimited) (required for handling and storage compatibility)

The SIT9121AI-1D2-33E156.253906T meets all substitution criteria with identical electrical and mechanical specifications, with the primary difference being the resonator technology (MEMS vs. Crystal) and packaging format (Tape & Reel vs. Strip).

Parameter Comparison

Engineering Selection Recommendations

Both the 511ABA000278AAG and SIT9121AI-1D2-33E156.253906T are Active products with ROHS3 compliance and MSL 1 ratings, qualifying both for equivalent substitution in applications requiring 156.253906 MHz LVPECL oscillation at 3.3V with Enable/Disable control.

The SIT9121AI-1D2-33E156.253906T offers a lower seated height (0.039" vs. 0.071"), which may provide advantages in space-constrained PCB designs. However, the SiTime part exhibits higher maximum supply current (69mA vs. 43mA) and higher disable-mode current (35mA vs. 18mA), which should be evaluated against power budget constraints in the target application.

Selection between these parts should be based on supply chain availability, cost considerations, and specific application requirements regarding power consumption and PCB height constraints. Both parts maintain identical electrical performance specifications and physical footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SIT9121AI-1D2-33E156.253906T directly replace the 511ABA000278AAG on the PCB?

A: Yes. Both parts share identical package type (6-SMD, No Lead), physical dimensions (7.00mm x 5.00mm), and mounting type (Surface Mount). The PCB footprint is compatible. The SiTime part has a lower seated height (1.00mm vs. 1.80mm), which does not create clearance issues for replacement.

Q: Are the electrical outputs identical between these two oscillators?

A: Yes. Both parts output LVPECL logic at 156.253906 MHz with ±25ppm frequency stability, 3.3V supply voltage, and Enable/Disable functionality. Signal compatibility is maintained across the operating temperature range of -40°C to 85°C.

Q: What is the difference between crystal and MEMS resonator technology in these parts?

A: The 511ABA000278AAG uses a crystal resonator, while the SIT9121AI-1D2-33E156.253906T uses MEMS technology. Both achieve the same frequency stability specification (±25ppm) and are functionally equivalent for this application. The MEMS-based part offers a lower profile and different power consumption characteristics.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant, carry MSL 1 (Unlimited) ratings, and share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What should I consider when choosing between these two oscillators?

A: Evaluate supply current requirements (43mA vs. 69mA maximum), disable-mode current (18mA vs. 35mA), and PCB height constraints (1.80mm vs. 1.00mm). Both parts are electrically and mechanically equivalent for direct substitution. Selection should be based on application-specific power budgets, available inventory, and cost factors.

Q: Is the packaging format difference (Strip vs. Tape & Reel) significant for substitution?

A: Packaging format affects procurement and assembly processes but does not impact electrical or mechanical compatibility. Both formats contain identical parts suitable for surface mount assembly.