501BCAM032768DAFR Equivalent & Substitute Parts

Part Overview

The 501BCAM032768DAFR is a 32.768 kHz CMEMS® LVCMOS Oscillator manufactured by Silicon Labs, designed for 3.3V applications with Enable/Disable functionality in a 4-SMD, No Lead package. This part is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

The 32.768 kHz frequency is standard for real-time clock (RTC) and timing applications. Substitute parts must maintain compatibility across frequency, output logic level, supply voltage, and physical package dimensions to ensure direct replacement capability.

Substiute Parts

501BCAM032768DAFR

Silicon LabsIn Stock: 1115501BCAM032768DAFR Datasheet

Current PartRFQ

ASDK-32.768KHZ-LRT

Abracon LLCIn Stock: 45507ASDK-32.768KHZ-LRT Datasheet

SimilarRFQ

SIT1533AC-H5-DCC-32.768G

SiTimeIn Stock: 1010SIT1533AC-H5-DCC-32.768G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 501BCAM032768DAFR is determined by the following critical parameters:

• Frequency: Must be 32.768 kHz (exact match required)
• Output Logic Level: Must be LVCMOS or CMOS compatible with 3.3V systems
• Supply Voltage: Must support 3.3V operation
• Function: Enable/Disable capability preferred but not mandatory for all applications
• Package / Case: Must be 4-SMD, No Lead for PCB compatibility
• Physical Dimensions: Length and width must match 2.50mm x 2.00mm; height variance acceptable within assembly constraints
• Frequency Stability: ±20ppm or better preferred for timing-critical applications

Two substitute parts meet these criteria with varying trade-offs in resonator technology, temperature range, and supply voltage flexibility.

Parameter Comparison

Engineering Selection Recommendations

ASDK-32.768KHZ-LRT (Abracon LLC)

This substitute provides the closest functional match to the 501BCAM032768DAFR. Both parts share identical package dimensions (2.50mm x 2.00mm), Enable/Disable functionality, and 3.3V supply voltage. The ASDK uses crystal-based resonator technology versus MEMS, resulting in ±25ppm stability (5ppm degradation from original). Operating temperature range extends to -40°C ~ 85°C, providing broader environmental coverage. Current consumption increases to 4.6mA. The part is Active status with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and simplified supply chain management.

SIT1533AC-H5-DCC-32.768G (SiTime)

This substitute maintains MEMS resonator technology and LVCMOS output matching the original part. Supply voltage range (1.5V ~ 3.63V) provides greater flexibility for multi-voltage systems. Physical footprint is smaller (2.00mm x 1.20mm) with reduced height (0.60mm), enabling space-constrained applications. However, frequency stability is +75ppm, representing significant degradation from the ±20ppm specification. Enable/Disable function is not specified. The part is Active status with ROHS3 compliance and MSL 1 rating. Smaller package dimensions may require PCB layout verification for compatibility.

Both substitute parts are Active status with current manufacturing support, ROHS3 compliance, and improved moisture sensitivity ratings compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can ASDK-32.768KHZ-LRT directly replace 501BCAM032768DAFR without PCB modifications?

A: Yes. Both parts share identical package type (4-SMD, No Lead) and physical dimensions (2.50mm x 2.00mm). Pin-to-pin compatibility and footprint alignment are maintained. No PCB layout changes are required.

Q: What is the frequency stability difference between the original and ASDK substitute?

A: The 501BCAM032768DAFR specifies ±20ppm stability, while ASDK-32.768KHZ-LRT specifies ±25ppm. This 5ppm difference is acceptable for most RTC and general timing applications but should be verified for precision timing requirements.

Q: Why does SIT1533AC-H5-DCC-32.768G have different physical dimensions?

A: The SIT1533 uses a smaller 2.00mm x 1.20mm footprint compared to the standard 2.50mm x 2.00mm package. This requires PCB footprint verification before implementation. The smaller form factor may not be compatible with existing board layouts designed for the original part.

Q: Is the SIT1533 suitable for applications requiring Enable/Disable functionality?

A: The SIT1533AC-H5-DCC-32.768G does not specify Enable/Disable function in the provided data. If this feature is required for your application, the ASDK-32.768KHZ-LRT is the recommended substitute.

Q: What are the moisture sensitivity implications of switching from MSL 2 to MSL 1?

A: MSL 1 (Unlimited shelf life) is superior to MSL 2 (1 Year shelf life). Both ASDK and SIT1533 substitutes offer improved moisture sensitivity ratings, reducing storage and handling constraints compared to the obsolete original part.

Q: Can SIT1533AC-H5-DCC-32.768G operate at supply voltages below 3.3V?

A: Yes. The SIT1533 supports supply voltage range 1.5V ~ 3.63V, enabling operation in lower voltage systems. The original 501BCAM032768DAFR is fixed at 3.3V. This flexibility may be advantageous for battery-powered or multi-voltage applications.

Q: Which substitute is recommended for extended temperature range applications?

A: The ASDK-32.768KHZ-LRT operates across -40°C ~ 85°C, compared to the original -20°C ~ 70°C range. For applications requiring operation below -20°C or above 70°C, the ASDK is the appropriate selection.