501JCAM032768CAG Equivalent & Substitute Parts

Part Overview

The Silicon Labs 501JCAM032768CAG is a 32.768 kHz CMEMS® LVCMOS oscillator 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 requiring low-frequency precision oscillation.

Substiute Parts

501JCAM032768CAG

Silicon LabsIn Stock: 807501JCAM032768CAG Datasheet

Current PartRFQ

ASEK-32.768KHZ-L-R-T

Abracon LLCIn Stock: 45950ASEK-32.768KHZ-L-R-T Datasheet

SimilarRFQ

SIT1533AI-H4-DCC-32.768G

SiTimeIn Stock: 3365SIT1533AI-H4-DCC-32.768G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 501JCAM032768CAG is determined by the following critical parameters:

• Frequency: Must be 32.768 kHz (no tolerance)
• Output Type: LVCMOS or CMOS compatible with 3.3V logic levels
• Supply Voltage: 3.3V nominal operation or voltage range encompassing 3.3V
• Package / Case: 4-SMD, No Lead form factor
• Physical Dimensions: 3.20mm x 2.50mm footprint compatibility
• Operating Temperature Range: -40°C ~ 85°C minimum coverage
• Function: Enable/Disable capability preferred for functional equivalence

The identified substitute parts maintain these core parameters while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

ASEK-32.768KHZ-L-R-T (Abracon LLC) provides the closest functional match to the 501JCAM032768CAG. This part maintains identical frequency, supply voltage, enable/disable function, package form factor, and physical footprint. The frequency stability specification of ±25ppm represents a minor deviation from the original ±20ppm. The part is active in production with ROHS3 compliance and unlimited moisture sensitivity rating, supporting long-term availability and environmental regulatory requirements.

SIT1533AI-H4-DCC-32.768G (SiTime) offers an alternative with active product status and superior power efficiency (1.4µA maximum supply current versus 4.9mA). This part supports a wider supply voltage range (1.5V ~ 3.63V) and features ROHS3 compliance. However, the smaller physical footprint (2.00mm x 1.20mm) requires PCB layout verification for compatibility with existing 3.20mm x 2.50mm pad patterns. The frequency stability specification of +100ppm is less stringent than the original part. This part does not include enable/disable functionality.

Frequently Asked Questions (FAQ)

Q: Can the ASEK-32.768KHZ-L-R-T be used as a direct replacement for the 501JCAM032768CAG?

A: Yes. Both parts share identical frequency (32.768 kHz), output type (CMOS/LVCMOS compatible), supply voltage (3.3V), package form factor (4-SMD, no lead), and physical dimensions (3.20mm x 2.50mm). The enable/disable function is present on both parts. PCB footprint compatibility is confirmed.

Q: What are the implications of the frequency stability difference between the original part and substitutes?

A: The 501JCAM032768CAG specifies ±20ppm stability. The ASEK-32.768KHZ-L-R-T provides ±25ppm, representing a 5ppm tolerance increase. The SIT1533AI-H4-DCC-32.768G specifies +100ppm, which is significantly less stringent. Frequency stability affects long-term timekeeping accuracy in RTC applications. Applications with tight timing requirements should verify that substitute stability meets system specifications.

Q: Is the SIT1533AI-H4-DCC-32.768G compatible with existing PCB layouts designed for the 501JCAM032768CAG?

A: Physical footprint compatibility requires verification. The SIT1533AI-H4-DCC-32.768G has a smaller footprint (2.00mm x 1.20mm) compared to the original 3.20mm x 2.50mm. Existing pad patterns designed for the larger package may not accommodate this part without PCB modification. Additionally, this part lacks enable/disable functionality, which may affect circuit operation if this feature is utilized.

Q: What is the significance of the moisture sensitivity level (MSL) ratings?

A: The 501JCAM032768CAG carries MSL 2 (1 Year), indicating a one-year shelf life after moisture exposure. Both substitute parts carry MSL 1 (Unlimited), providing superior moisture tolerance and extended shelf life. This represents an improvement in handling and storage flexibility.

Q: Are both substitute parts compliant with current environmental regulations?

A: Yes. Both the ASEK-32.768KHZ-L-R-T and SIT1533AI-H4-DCC-32.768G are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.