501HCAM032768BAF Equivalent & Substitute Parts

Part Overview

The Silicon Labs 501HCAM032768BAF is a 32.768 kHz CMEMS® LVCMOS oscillator designed for low-power applications requiring precise timekeeping. This device operates across a wide supply voltage range of 1.7V to 3.6V and features enable/disable functionality. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

501HCAM032768BAF

Silicon LabsIn Stock: 1141501HCAM032768BAF Datasheet

Current PartRFQ

7CZ-32.768KCTF-T

TXC CORPORATIONIn Stock: 11567CZ-32.768KCTF-T 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 501HCAM032768BAF is determined by the following critical parameters:

Mandatory Matching Criteria:

• Frequency: 32.768 kHz (exact match required)
• Package Type: 4-SMD, No Lead (physical and electrical compatibility)
• Output Type: LVCMOS (signal level compatibility)
• Supply Voltage Range: Must encompass or be compatible with 1.7V ~ 3.6V operating window

Allowable Variation Parameters:

• Frequency Stability: Substitute may differ from ±20ppm if application tolerances permit
• Operating Temperature: Substitute range may be wider or narrower depending on system requirements
• Current Consumption: Substitute specifications may vary
• Resonator Type: MEMS or Crystal-based resonators are both acceptable for this frequency and output type
• Product Status: Active parts are preferred for obsolete replacements

The two identified substitute parts meet these criteria through matching frequency, package configuration, and output signaling while maintaining electrical compatibility across the specified supply voltage range.

Parameter Comparison

Engineering Selection Recommendations

SIT1533AC-H5-DCC-32.768G (SiTime): This substitute provides the closest electrical match to the 501HCAM032768BAF. Both devices utilize MEMS resonators and LVCMOS output signaling. The SiT1533 operates across 1.5V to 3.63V, which encompasses the original 1.7V to 3.6V range. The device is active and carries ROHS3 compliance with unlimited MSL rating, providing superior long-term availability and environmental compliance. The smaller package footprint (2.00mm x 1.20mm) offers space savings in PCB layouts. Frequency stability of +75ppm differs from the original ±20ppm specification and must be evaluated against application requirements.

7CZ-32.768KCTF-T (TXC CORPORATION): This substitute uses a crystal-based resonator instead of MEMS technology but maintains the same 32.768 kHz frequency and 4-SMD package configuration. The device operates at a fixed 2.5V supply voltage, which is within the original operating range but does not provide the full 1.7V to 3.6V flexibility. Frequency stability of ±25ppm is closer to the original specification than the SiTime alternative. The extended operating temperature range (-40°C to 85°C) exceeds the original specification. The device is active with RoHS compliance and unlimited MSL rating. Current consumption of 3mA is lower than the original 4.9mA specification.

Both substitutes are active products with current manufacturing support and improved environmental compliance compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the SIT1533AC-H5-DCC-32.768G be used as a direct replacement for the 501HCAM032768BAF?

A: The SIT1533AC-H5-DCC-32.768G is electrically compatible for most applications. Both devices share MEMS resonator technology, LVCMOS output, and overlapping supply voltage ranges. The primary consideration is frequency stability: the SiTime part specifies +75ppm versus the original ±20ppm. Applications requiring tighter frequency tolerance must evaluate this difference against system specifications.

Q: What is the difference between the MEMS-based SiTime substitute and the crystal-based TXC substitute?

A: Both technologies deliver the required 32.768 kHz frequency in compatible packages. MEMS resonators (SiTime) typically offer better shock and vibration resistance, while crystal resonators (TXC) may provide different aging characteristics. The TXC part operates at a fixed 2.5V supply, whereas the SiTime part supports the wider 1.5V to 3.63V range. Selection depends on system power supply architecture and environmental conditions.

Q: Are there package footprint considerations when substituting these parts?

A: Yes. The SIT1533AC-H5-DCC-32.768G uses a smaller 2.00mm x 1.20mm footprint compared to the original 4.00mm x 3.20mm package. The 7CZ-32.768KCTF-T uses a larger 5.00mm x 3.20mm footprint. PCB layout modifications may be required depending on the substitute selected. All three parts use 4-SMD, No Lead packages and are surface-mount compatible.

Q: What are the compliance and availability advantages of these substitutes?

A: Both substitute parts are active products with current manufacturing support, addressing the obsolescence of the original 501HCAM032768BAF. The SiTime part carries ROHS3 compliance with unlimited MSL rating. The TXC part carries RoHS compliance with unlimited MSL rating. Both offer superior long-term supply chain stability compared to the obsolete original part.

Q: How do the supply voltage ranges compare?

A: The original part operates from 1.7V to 3.6V. The SIT1533AC-H5-DCC-32.768G extends this to 1.5V to 3.63V, providing slightly broader compatibility. The 7CZ-32.768KCTF-T operates at a fixed 2.5V, which falls within the original range but does not provide voltage flexibility. System power supply design determines which substitute is appropriate.