501JCAM032768DAFR Equivalent & Substitute Parts

Part Overview

The 501JCAM032768DAFR 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 equivalent and substitute components 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 with the 3.3V supply voltage, LVCMOS output standard, Enable/Disable control function, and 4-SMD, No Lead package format to ensure direct replacement capability.

Key Parameters

Parameter	Value
Frequency	32.768 kHz
Output Type	LVCMOS
Supply Voltage	3.3V
Function	Enable/Disable
Package Type	4-SMD, No Lead
Mounting	Surface Mount
Base Resonator	MEMS
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 501JCAM032768DAFR is determined by the following critical parameters:

Frequency Match: 32.768 kHz (exact)
Output Standard: LVCMOS or CMOS (compatible logic families)
Supply Voltage: 3.3V nominal operation
Control Function: Enable/Disable capability
Package: 4-SMD, No Lead format
Mounting Type: Surface Mount

Two substitute parts meet these criteria with varying resonator technologies and performance characteristics. Both maintain the same package footprint and pinout compatibility, allowing direct board-level substitution.

Parameter Comparison

Parameter	501JCAM032768DAFR (Main)	ASDK-32.768KHZ-LRT	SIT1533AC-H5-DCC-32.768G
Manufacturer	Silicon Labs	Abracon LLC	SiTime
Frequency	32.768 kHz	32.768 kHz	32.768 kHz
Output Type	LVCMOS	CMOS	LVCMOS
Supply Voltage	3.3V	3.3V	1.5V ~ 3.63V
Function	Enable/Disable	Enable/Disable	-
Base Resonator	MEMS	Crystal	MEMS
Frequency Stability	±20ppm	±25ppm	+75ppm
Operating Temperature	-20°C ~ 70°C	-40°C ~ 85°C	-10°C ~ 70°C
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	0.098" L x 0.079" W (2.50mm x 2.00mm)	0.098" L x 0.079" W (2.50mm x 2.00mm)	0.079" L x 0.047" W (2.00mm x 1.20mm)
Height - Seated (Max)	0.035" (0.90mm)	0.037" (0.95mm)	0.024" (0.60mm)
Current - Supply (Max)	4.9mA	4.6mA	-
Product Status	Obsolete	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

ASDK-32.768KHZ-LRT (Abracon LLC) is the primary substitute for applications requiring direct functional equivalence. This part maintains Enable/Disable control, identical package dimensions, and 3.3V operation. The crystal-based resonator provides ±25ppm stability with extended operating temperature range (-40°C ~ 85°C). Current consumption is lower at 4.6mA maximum. The part is Active status with ROHS3 compliance and unlimited MSL rating, supporting long-term supply availability and environmental compliance requirements.

SIT1533AC-H5-DCC-32.768G (SiTime) serves as an alternative for applications where Enable/Disable function is not required. This MEMS-based oscillator offers superior frequency stability at +75ppm and operates across an extended voltage range (1.5V ~ 3.63V), providing design flexibility. The smaller footprint (2.00mm x 1.20mm) and lower profile (0.60mm) enable space-constrained applications. Active product status and ROHS3 compliance ensure long-term availability. Note that this part does not include Enable/Disable functionality.

Both substitute parts are Active products with current manufacturing support, addressing the Obsolete status of the original 501JCAM032768DAFR.

Frequently Asked Questions (FAQ)

Q: Can ASDK-32.768KHZ-LRT directly replace 501JCAM032768DAFR without circuit modifications?

A: Yes. Both parts share identical package dimensions (2.50mm x 2.00mm), 4-SMD No Lead format, 3.3V supply voltage, and Enable/Disable control function. Pinout compatibility allows direct board-level substitution.

Q: What is the key difference between the crystal-based ASDK and MEMS-based alternatives?

A: The ASDK-32.768KHZ-LRT uses a crystal resonator, while the 501JCAM032768DAFR and SIT1533AC-H5-DCC-32.768G use MEMS resonators. Crystal oscillators typically offer lower cost and established long-term reliability in RTC applications. MEMS oscillators provide better shock/vibration immunity and smaller form factors.

Q: Is SIT1533AC-H5-DCC-32.768G suitable as a direct replacement?

A: SIT1533AC-H5-DCC-32.768G is compatible for frequency and output type but lacks Enable/Disable functionality. If your circuit requires this control feature, circuit redesign is necessary. The smaller package footprint may also require PCB layout adjustment.

Q: What are the compliance and supply chain implications of these substitutes?

A: Both ASDK-32.768KHZ-LRT and SIT1533AC-H5-DCC-32.768G are Active products with ROHS3 compliance and unlimited MSL ratings, ensuring long-term availability and environmental regulation compliance. The original 501JCAM032768DAFR is Obsolete with limited remaining inventory.

Q: How do frequency stability specifications affect application performance?

A: The 501JCAM032768DAFR specifies ±20ppm, ASDK-32.768KHZ-LRT specifies ±25ppm, and SIT1533AC-H5-DCC-32.768G specifies +75ppm. For RTC applications, all three meet typical accuracy requirements. Applications requiring tighter frequency control should prioritize the ±20ppm or ±25ppm options.

Q: Are there temperature range considerations for substitution?

A: The 501JCAM032768DAFR operates -20°C ~ 70°C, ASDK-32.768KHZ-LRT operates -40°C ~ 85°C, and SIT1533AC-H5-DCC-32.768G operates -10°C ~ 70°C. If your application requires operation below -20°C or above 70°C, ASDK-32.768KHZ-LRT is the appropriate choice.

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