501BCAM032768BAF Equivalent & Substitute Parts

Part Overview

The 501BCAM032768BAF is a 32.768 kHz CMEMS® LVCMOS oscillator manufactured by Silicon Labs, designed for applications requiring low-frequency timing signals with enable/disable functionality. This component operates at 3.3V supply voltage and is housed in a compact 4-SMD, No Lead package. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Frequency	32.768 kHz
Output Type	LVCMOS
Supply Voltage	3.3V
Function	Enable/Disable
Base Resonator	MEMS
Package	4-SMD, No Lead
Frequency Stability	±20ppm
Operating Temperature	-20°C ~ 70°C
Current - Supply (Max)	2.5mA
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the 501BCAM032768BAF is determined by the following critical parameters:

Frequency Match: 32.768 kHz (exact match required)
Output Compatibility: LVCMOS output standard
Supply Voltage Compatibility: 3.3V operation capability
Package Compatibility: 4-SMD, No Lead form factor
Function Compatibility: Enable/Disable control capability
Mounting Type: Surface Mount

Two substitute parts meet these criteria: the KD3270040 (Diodes Incorporated) and the SIT1533AC-H5-DCC-32.768G (SiTime). Both components share the same frequency, output standard, supply voltage range, package type, and mounting method as the original part.

Parameter Comparison

Parameter	501BCAM032768BAF (Main)	KD3270040 (Substitute)	SIT1533AC-H5-DCC-32.768G (Substitute)
Manufacturer	Silicon Labs	Diodes Incorporated	SiTime
Frequency	32.768 kHz	32.768 kHz	32.768 kHz
Output Type	LVCMOS	LVCMOS, LVTTL	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
Current - Supply (Max)	2.5mA	500µA	-
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)	0.197" L x 0.126" W (5.00mm x 3.20mm)	0.079" L x 0.047" W (2.00mm x 1.20mm)
Height - Seated (Max)	0.035" (0.90mm)	0.053" (1.35mm)	0.024" (0.60mm)
Product Status	Obsolete	Active	Active
Moisture Sensitivity Level (MSL)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

KD3270040 (Diodes Incorporated)

The KD3270040 is an active product with ROHS3 compliance and MSL 1 rating, providing superior moisture handling compared to the original part. This crystal-based oscillator operates within the required 3.3V supply voltage and maintains LVCMOS output compatibility. The extended operating temperature range (-40°C ~ 85°C) exceeds the original specification. Current consumption is significantly lower at 500µA maximum. Physical dimensions are slightly larger (5.00mm x 3.20mm vs. 4.00mm x 3.20mm), and height is increased to 1.35mm. Enable/Disable functionality is preserved. Frequency stability of ±25ppm represents a minor deviation from the original ±20ppm specification.

SIT1533AC-H5-DCC-32.768G (SiTime)

The SIT1533AC-H5-DCC-32.768G is an active MEMS-based oscillator with ROHS3 compliance and MSL 1 rating. This part maintains MEMS resonator technology matching the original design approach. Supply voltage range (1.5V ~ 3.63V) provides broader compatibility than the fixed 3.3V requirement. The component features the smallest physical footprint (2.00mm x 1.20mm) and lowest height (0.60mm) among all options, advantageous for space-constrained applications. However, enable/disable function is not specified for this part. Frequency stability of +75ppm represents a significant deviation from the original ±20ppm specification.

Frequently Asked Questions (FAQ)

Q: Can the KD3270040 directly replace the 501BCAM032768BAF in existing designs?

A: The KD3270040 maintains functional compatibility through matching frequency, output type, supply voltage, package, and enable/disable capability. Physical dimensions differ slightly (5.00mm x 3.20mm vs. 4.00mm x 3.20mm), requiring PCB layout verification. Frequency stability tolerance increases from ±20ppm to ±25ppm, which may impact timing-critical applications.

Q: What is the primary difference between the KD3270040 and SIT1533AC-H5-DCC-32.768G?

A: The KD3270040 uses crystal resonator technology with enable/disable function and ±25ppm stability, while the SIT1533AC-H5-DCC-32.768G uses MEMS technology without specified enable/disable function and +75ppm stability. The SiTime part offers a smaller footprint and broader voltage range but lacks the enable/disable feature present in the original design.

Q: Does the SIT1533AC-H5-DCC-32.768G support enable/disable functionality?

A: Enable/disable function is not specified in the provided parameters for the SIT1533AC-H5-DCC-32.768G. If enable/disable control is required for system operation, the KD3270040 is the appropriate substitute.

Q: How do frequency stability differences affect component selection?

A: The original 501BCAM032768BAF specifies ±20ppm stability. The KD3270040 provides ±25ppm, and the SIT1533AC-H5-DCC-32.768G provides +75ppm. Applications with strict frequency tolerance requirements should prioritize the KD3270040. The SIT1533AC-H5-DCC-32.768G is suitable only for applications with relaxed frequency stability requirements.

Q: Are both substitute parts RoHS compliant?

A: Yes, both the KD3270040 and SIT1533AC-H5-DCC-32.768G are ROHS3 compliant. The original 501BCAM032768BAF RoHS status is not specified in the provided data.

Q: What are the moisture sensitivity implications of each substitute?

A: The original part carries MSL 2 (1 Year) rating. Both substitutes feature MSL 1 (Unlimited) rating, providing superior moisture resistance and extended shelf life without requiring controlled storage conditions.

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