501HCAM032768DAGR Equivalent & Substitute Parts

Part Overview

The 501HCAM032768DAGR is a 32.768 kHz CMEMS® LVCMOS Oscillator manufactured by Silicon Labs, designed for low-frequency timing applications requiring wide supply voltage range (1.7V ~ 3.6V) and enable/disable functionality. This part operates across industrial temperature ranges (-40°C ~ 85°C) with ±20ppm frequency stability. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Frequency	32.768 kHz
Output Type	LVCMOS
Supply Voltage Range	1.7V ~ 3.6V
Frequency Stability	±20ppm
Operating Temperature	-40°C ~ 85°C
Function	Enable/Disable
Package	4-SMD, No Lead
Size	2.50mm x 2.00mm
Base Resonator	MEMS
Current - Supply (Max)	4.9mA

Substitute Part Grouping Explanation

Substitution eligibility for the 501HCAM032768DAGR is determined by the following critical parameters:

Frequency Match: 32.768 kHz (exact)
Output Compatibility: LVCMOS or CMOS output capable of interfacing with LVCMOS logic levels
Supply Voltage: Must support the application's operating voltage; minimum 1.7V capability preferred for full compatibility
Package Type: 4-SMD, No Lead form factor for direct PCB replacement
Operating Temperature Range: -40°C ~ 85°C minimum requirement
Enable/Disable Function: Preferred for power management equivalence

Two substitute parts meet these criteria with varying trade-offs in resonator technology, supply voltage range, and frequency stability specifications.

Parameter Comparison

Parameter	501HCAM032768DAGR (Main)	SIT1533AI-H4-DCC-32.768G	ASDK1-32.768KHZ-LRT
Manufacturer	Silicon Labs	SiTime	Abracon LLC
Frequency	32.768 kHz	32.768 kHz	32.768 kHz
Output Type	LVCMOS	LVCMOS	CMOS
Supply Voltage	1.7V ~ 3.6V	1.5V ~ 3.63V	2.5V
Frequency Stability	±20ppm	+100ppm	±25ppm
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Function	Enable/Disable	-	Enable/Disable
Package	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size (L x W)	2.50mm x 2.00mm	2.00mm x 1.20mm	2.50mm x 2.00mm
Height (Max)	0.90mm	0.60mm	0.95mm
Current - Supply (Max)	4.9mA	1.4µA	2.5mA
Product Status	Obsolete	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SIT1533AI-H4-DCC-32.768G provides the closest electrical compatibility with LVCMOS output and extended supply voltage range (1.5V ~ 3.63V). This part is actively manufactured with ROHS3 compliance and unlimited moisture sensitivity rating. The significantly reduced supply current (1.4µA vs. 4.9mA) offers power efficiency benefits. However, the frequency stability specification (+100ppm) is broader than the original part (±20ppm), requiring verification against application timing tolerances. The smaller physical footprint (2.00mm x 1.20mm) may require PCB layout adjustment.

ASDK1-32.768KHZ-LRT maintains identical package dimensions and form factor to the original part, simplifying PCB integration. This crystal-based oscillator delivers tighter frequency stability (±25ppm) and retains enable/disable functionality. Supply voltage is fixed at 2.5V, suitable for standard logic supply rails. Current consumption (2.5mA) falls between the original and SiTime alternatives. ROHS3 compliance and unlimited MSL rating ensure long-term availability and storage flexibility.

Both substitutes are actively produced with current inventory availability and modern compliance certifications, addressing the obsolescence status of the original part.

Frequently Asked Questions (FAQ)

Q: Can the SIT1533AI-H4-DCC-32.768G directly replace the 501HCAM032768DAGR on existing PCBs?

A: Physical replacement is possible due to identical 4-SMD, No Lead package type and compatible pinout. However, the smaller footprint (2.00mm x 1.20mm vs. 2.50mm x 2.00mm) may require PCB layout verification. The absence of enable/disable function specification requires confirmation that your application does not depend on this feature. Frequency stability difference (+100ppm vs. ±20ppm) must be evaluated against system timing requirements.

Q: What are the voltage supply considerations when substituting?

A: The original part operates from 1.7V ~ 3.6V. The SIT1533AI-H4-DCC-32.768G supports 1.5V ~ 3.63V, providing equivalent or superior range. The ASDK1-32.768KHZ-LRT operates at fixed 2.5V, which is compatible with standard 3.3V and 5V logic systems but not suitable for lower voltage applications below 2.5V.

Q: How does frequency stability affect system performance?

A: The original part specifies ±20ppm stability. The ASDK1-32.768KHZ-LRT maintains ±25ppm, a minor deviation acceptable for most 32.768 kHz timing applications. The SIT1533AI-H4-DCC-32.768G specifies +100ppm, a unidirectional specification suitable for applications tolerating broader frequency variation. Verify your system's timing accuracy requirements before selection.

Q: Are there package height constraints?

A: The original part height is 0.90mm (max). The SIT1533AI-H4-DCC-32.768G is significantly lower at 0.60mm, beneficial for space-constrained designs. The ASDK1-32.768KHZ-LRT is 0.95mm, comparable to the original. Confirm PCB clearance requirements for your application.

Q: What is the significance of MSL ratings?

A: The original part carries MSL 2 (1 Year), requiring controlled storage conditions. Both substitutes feature MSL 1 (Unlimited), eliminating moisture sensitivity constraints and simplifying inventory management and long-term storage.

Q: Does the enable/disable function difference matter?

A: The original part and ASDK1-32.768KHZ-LRT both provide enable/disable functionality for power management. The SIT1533AI-H4-DCC-32.768G does not specify this function. If your design relies on disabling the oscillator for power savings, the ASDK1-32.768KHZ-LRT is the appropriate choice.

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