501HCAM032768BAFR Equivalent & Substitute Parts

Part Overview

The 501HCAM032768BAFR is a 32.768 kHz CMEMS® LVCMOS Oscillator manufactured by Silicon Labs, designed for low-power timing applications requiring enable/disable functionality. Operating across 1.7V to 3.6V supply range with ±20ppm frequency stability, this component is classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Frequency	32.768 kHz
Output Type	LVCMOS
Supply Voltage Range	1.7V ~ 3.6V
Frequency Stability	±20ppm
Operating Temperature	-20°C ~ 70°C
Package Type	4-SMD, No Lead
Base Resonator	MEMS
Function	Enable/Disable
Maximum Supply Current	4.9mA

Substitute Part Grouping Explanation

Substitution eligibility for the 501HCAM032768BAFR is determined by the following critical parameters:

Frequency match at 32.768 kHz
Output compatibility (LVCMOS preferred for direct replacement)
Supply voltage range overlap with 1.7V ~ 3.6V
Package compatibility (4-SMD, No Lead form factor)
Frequency stability within acceptable tolerance for timing applications

Two substitute parts meet these criteria with varying degrees of compatibility:

SIT1533AC-H5-DCC-32.768G (SiTime): Maintains MEMS resonator technology and LVCMOS output with extended voltage range (1.5V ~ 3.63V), ensuring full backward compatibility. Active product status provides long-term availability.

7CZ-32.768KCTF-T (TXC Corporation): Delivers 32.768 kHz output in CMOS format with reduced supply voltage requirement (2.5V fixed). Crystal-based resonator technology offers alternative implementation approach. Active product status ensures continued supply.

Parameter Comparison

Parameter	501HCAM032768BAFR (Main)	SIT1533AC-H5-DCC-32.768G	7CZ-32.768KCTF-T
Manufacturer	Silicon Labs	SiTime	TXC Corporation
Frequency	32.768 kHz	32.768 kHz	32.768 kHz
Base Resonator	MEMS	MEMS	Crystal
Output Type	LVCMOS	LVCMOS	CMOS
Supply Voltage	1.7V ~ 3.6V	1.5V ~ 3.63V	2.5V
Frequency Stability	±20ppm	+75ppm	±25ppm
Operating Temperature	-20°C ~ 70°C	-10°C ~ 70°C	-40°C ~ 85°C
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	0.157" L x 0.126" W (4.00mm x 3.20mm)	0.079" L x 0.047" W (2.00mm x 1.20mm)	0.197" L x 0.126" W (5.00mm x 3.20mm)
Height - Seated (Max)	0.035" (0.90mm)	0.024" (0.60mm)	0.055" (1.40mm)
Product Status	Obsolete	Active	Active
RoHS Status	-	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SIT1533AC-H5-DCC-32.768G is the primary substitute for direct replacement applications. This part maintains MEMS resonator technology identical to the main part, preserves LVCMOS output compatibility, and extends the supply voltage range to 1.5V ~ 3.63V, ensuring operation across all conditions supported by the original design. Active product status with ROHS3 compliance and unlimited MSL rating provides superior long-term availability and environmental compliance.

7CZ-32.768KCTF-T serves as an alternative for applications where fixed 2.5V supply voltage is acceptable. The crystal-based resonator offers proven reliability in timing applications, with extended operating temperature range (-40°C ~ 85°C) suitable for industrial environments. RoHS compliance and unlimited MSL rating support modern manufacturing requirements. This option requires verification that the fixed 2.5V supply voltage aligns with system power architecture.

Both substitutes maintain the 4-SMD, No Lead package form factor and 32.768 kHz frequency specification. Physical dimensions differ; verify PCB layout compatibility before implementation.

Frequently Asked Questions (FAQ)

Q: Can SIT1533AC-H5-DCC-32.768G directly replace 501HCAM032768BAFR without circuit modification?

A: Yes. Both parts share MEMS resonator technology, LVCMOS output, and 4-SMD No Lead packaging. The SiTime part's extended voltage range (1.5V ~ 3.63V) encompasses the original specification (1.7V ~ 3.6V). Pin-to-pin compatibility and functional equivalence are maintained.

Q: What is the impact of frequency stability differences between the main part and substitutes?

A: The main part specifies ±20ppm stability. SIT1533AC-H5-DCC-32.768G provides +75ppm, while 7CZ-32.768KCTF-T offers ±25ppm. For 32.768 kHz timing applications, verify that substitute stability meets system accuracy requirements. Applications with tight timing tolerances may require evaluation.

Q: Is the 7CZ-32.768KCTF-T suitable for low-voltage applications below 2.5V?

A: No. The TXC part operates at fixed 2.5V supply voltage only. Applications requiring operation at 1.7V ~ 2.4V must use SIT1533AC-H5-DCC-32.768G, which supports the full lower voltage range.

Q: How do physical dimension differences affect PCB design?

A: SIT1533AC-H5-DCC-32.768G is significantly smaller (2.00mm x 1.20mm vs. 4.00mm x 3.20mm), enabling compact layouts. 7CZ-32.768KCTF-T is larger (5.00mm x 3.20mm). Verify footprint compatibility with existing PCB designs before component selection.

Q: What are the moisture sensitivity implications for manufacturing?

A: The main part carries MSL 2 (1 Year) rating. Both substitutes feature MSL 1 (Unlimited), providing superior moisture tolerance and extended shelf life. This represents an improvement in manufacturing flexibility and component storage requirements.

Q: Are both substitutes suitable for industrial temperature range applications?

A: The main part operates -20°C ~ 70°C. SIT1533AC-H5-DCC-32.768G maintains this range (-10°C ~ 70°C). 7CZ-32.768KCTF-T extends to -40°C ~ 85°C, supporting broader industrial temperature requirements. Verify application temperature specifications for appropriate selection.

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