501JCAM032768DAF Equivalent & Substitute Parts

Part Overview

The 501JCAM032768DAF is a 32.768 kHz CMEMS® LVCMOS Oscillator manufactured by Silicon Labs, designed for 3.3V applications with Enable/Disable functionality in a compact 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

501JCAM032768DAF

Silicon LabsIn Stock: 1090501JCAM032768DAF 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 501JCAM032768DAF is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Frequency: 32.768 kHz (exact match required)
• Output Logic Level: LVCMOS or CMOS (compatible with 3.3V LVCMOS systems)
• Supply Voltage: 3.3V nominal operation (acceptable range: 3.0V ~ 3.6V)
• Package / Case: 4-SMD, No Lead (physical and electrical footprint match)
• Mounting Type: Surface Mount
• Function: Enable/Disable capability (or equivalent control function)

Acceptable Variation Parameters:

• Frequency Stability: ±20ppm or better (lower values acceptable)
• Operating Temperature: Must encompass or exceed -20°C ~ 70°C range
• Current Consumption: Values at or below 4.9mA acceptable
• Moisture Sensitivity Level: MSL 2 or better (MSL 1 preferred for extended shelf life)

Identified Substitute Parts:

1. ASDK-32.768KHZ-LRT (Abracon LLC) – Crystal-based XO with CMOS output, Active status, superior MSL rating
2. SIT1533AC-H5-DCC-32.768G (SiTime) – MEMS-based XO with LVCMOS output, Active status, wider voltage range, smaller footprint

Parameter Comparison

Engineering Selection Recommendations

ASDK-32.768KHZ-LRT (Abracon LLC)

This substitute is suitable for applications requiring extended operating temperature range (-40°C ~ 85°C) and improved moisture handling (MSL 1). The crystal-based resonator provides ±25ppm stability, acceptable for most RTC applications. Lower supply current (4.6mA) reduces power consumption. Physical dimensions match the original part exactly. Active product status ensures long-term availability and supply chain stability. ROHS3 compliance and REACH unaffected status support regulatory requirements.

SIT1533AC-H5-DCC-32.768G (SiTime)

This substitute offers the closest technical alignment with MEMS-based resonator technology matching the original design. LVCMOS output provides direct compatibility. Extended supply voltage range (1.5V ~ 3.63V) enables broader application flexibility. Smaller footprint (2.00mm x 1.20mm) and lower height (0.60mm) support space-constrained designs. Active product status and unlimited MSL rating provide superior long-term reliability. ROHS3 compliance and REACH unaffected status meet regulatory standards. Note: Frequency stability specification (+75ppm) is less stringent than the original part; applications requiring ±20ppm or better stability should evaluate this parameter against system requirements.

Frequently Asked Questions (FAQ)

Q: Can ASDK-32.768KHZ-LRT replace 501JCAM032768DAF directly?

A: Yes. Both parts operate at 32.768 kHz with 3.3V supply, 4-SMD No Lead package, and identical physical dimensions (2.50mm x 2.00mm). CMOS output is compatible with LVCMOS input receivers. The ±25ppm stability is acceptable for standard RTC applications. Extended temperature range (-40°C ~ 85°C) and improved MSL rating (1 vs. 2) provide additional design margin.

Q: Can SIT1533AC-H5-DCC-32.768G replace 501JCAM032768DAF directly?

A: Yes, with design consideration. Both parts operate at 32.768 kHz with LVCMOS output and 4-SMD No Lead package. The SiTime part has a smaller footprint (2.00mm x 1.20mm vs. 2.50mm x 2.00mm) and lower height (0.60mm vs. 0.90mm), which may require PCB layout adjustment. Supply voltage range (1.5V ~ 3.63V) is broader than the original 3.3V specification. Frequency stability (+75ppm) is less stringent; verify this meets application requirements before selection.

Q: What is the difference between MEMS and crystal-based oscillators?

A: The 501JCAM032768DAF uses MEMS resonator technology; ASDK-32.768KHZ-LRT uses crystal resonator technology. Both achieve 32.768 kHz output suitable for RTC applications. MEMS oscillators typically offer better shock/vibration resistance and smaller size; crystal oscillators traditionally provide lower cost and established long-term reliability data. For this 32.768 kHz application, both technologies are functionally equivalent.

Q: Are there supply voltage compatibility concerns?

A: The original part operates at 3.3V nominal. ASDK-32.768KHZ-LRT is specified for 3.3V operation. SIT1533AC-H5-DCC-32.768G operates across 1.5V ~ 3.63V, which includes 3.3V within its range. Both substitutes are compatible with 3.3V supply systems. If your system uses a different supply voltage, verify the substitute part's voltage specification before selection.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates how long a component can be stored after manufacturing before moisture absorption affects reliability. MSL 1 (Unlimited) means no time restriction; MSL 2 (1 Year) means the component must be used within one year of manufacturing. Both substitute parts have MSL 1 rating, providing superior shelf-life flexibility compared to the original MSL 2 rating.

Q: Do the substitute parts support Enable/Disable functionality?

A: ASDK-32.768KHZ-LRT explicitly supports Enable/Disable function. SIT1533AC-H5-DCC-32.768G does not list Enable/Disable in the provided specifications; verify control pin functionality against your application requirements if this feature is critical to system design.