501BCAM032768DAGR Equivalent & Substitute Parts

Part Overview

The Silicon Labs 501BCAM032768DAGR is a 32.768 kHz CMEMS® LVCMOS Oscillator 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 functionally equivalent alternatives essential for ongoing system support and new design implementations.

The 32.768 kHz frequency is standard for real-time clock (RTC) and timing applications across consumer electronics, industrial equipment, and IoT devices. Substitute parts must maintain compatibility across frequency, output logic level, supply voltage, package form factor, and thermal operating range.

Substiute Parts

501BCAM032768DAGR

Silicon LabsIn Stock: 1088501BCAM032768DAGR Datasheet

Current PartRFQ

ASDK-32.768KHZ-LRT

Abracon LLCIn Stock: 45507ASDK-32.768KHZ-LRT Datasheet

SimilarRFQ

SIT1533AI-H4-DCC-32.768G

SiTimeIn Stock: 3365SIT1533AI-H4-DCC-32.768G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 501BCAM032768DAGR is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Frequency: 32.768 kHz (exact match required)
• Package / Case: 4-SMD, No Lead (physical and electrical compatibility)
• Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
• Output Logic Level: LVCMOS or CMOS (compatible signal levels for 3.3V systems)
• Supply Voltage: 3.3V nominal operation

Functional Parameters:

• Enable/Disable capability or equivalent control functionality
• Surface Mount configuration for PCB integration

Two substitute parts meet these criteria:

1. ASDK-32.768KHZ-LRT (Abracon LLC) – Crystal-based XO with CMOS output, Active product status
2. SIT1533AI-H4-DCC-32.768G (SiTime) – MEMS-based XO with LVCMOS output, Active product status

Both alternatives operate at 32.768 kHz, support 3.3V supply, use identical 4-SMD No Lead packaging, and maintain the -40°C to 85°C temperature range. Frequency stability and current consumption vary within acceptable ranges for RTC and timing applications.

Parameter Comparison

Engineering Selection Recommendations

ASDK-32.768KHZ-LRT (Abracon LLC) – Recommended for Direct Replacement

This substitute provides the closest functional match to the 501BCAM032768DAGR. Both parts use identical 4-SMD No Lead packaging (0.098" x 0.079" x 0.037" max), operate across -40°C to 85°C, and support 3.3V supply with Enable/Disable control. The CMOS output is compatible with LVCMOS input receivers in 3.3V systems. Frequency stability of ±25ppm is acceptable for RTC applications where ±20ppm was specified. Current consumption increases from 2.5mA to 4.6mA, which remains within typical system budgets. The part is Active with unlimited MSL rating and ROHS3 compliance, ensuring long-term availability and environmental compliance.

SIT1533AI-H4-DCC-32.768G (SiTime) – Alternative for Space-Constrained Designs

This MEMS-based oscillator offers superior performance characteristics: significantly lower current consumption (1.4µA vs. 2.5mA), wider supply voltage range (1.5V to 3.63V), and smaller physical footprint (0.079" x 0.047" x 0.024" max). The trade-off is reduced frequency stability (+100ppm vs. ±20ppm), which may be acceptable for applications where timing precision is less critical. This part is Active with ROHS3 compliance and unlimited MSL rating. The smaller package enables space optimization in compact designs. Note that the SIT1533 lacks explicit Enable/Disable function specification; verify control requirements against application needs.

Both substitutes are Active products with current manufacturing support, ROHS3 compliance, and unlimited moisture sensitivity ratings, providing superior supply chain reliability compared to the Obsolete 501BCAM032768DAGR.

Frequently Asked Questions (FAQ)

Q: Can ASDK-32.768KHZ-LRT replace 501BCAM032768DAGR directly on the PCB?

A: Yes. Both parts use identical 4-SMD No Lead packaging (0.098" x 0.079" footprint) and fit the same PCB land pattern. The CMOS output is compatible with LVCMOS input receivers. No PCB redesign is required.

Q: What is the difference between LVCMOS and CMOS output?

A: LVCMOS (Low Voltage CMOS) and CMOS are compatible logic families for 3.3V systems. LVCMOS specifies tighter output voltage levels optimized for low-voltage operation. Both drive standard CMOS inputs reliably at 3.3V.

Q: Why does SIT1533AI-H4-DCC-32.768G have different frequency stability?

A: The SIT1533 uses MEMS resonator technology with +100ppm stability, compared to the original part's ±20ppm. This reflects the inherent characteristics of MEMS versus traditional crystal resonators. For RTC applications, +100ppm stability is acceptable; for precision timing, ASDK-32.768KHZ-LRT is preferred.

Q: Is the smaller SIT1533 package compatible with existing PCB layouts?

A: The SIT1533 (0.079" x 0.047") is smaller than both the original part and ASDK substitute (0.098" x 0.079"). It will not fit existing land patterns without PCB modification. Use this part only for new designs or when PCB redesign is feasible.

Q: What is the Enable/Disable function, and do all substitutes support it?

A: Enable/Disable allows the oscillator to be powered down via a control pin, reducing current consumption. ASDK-32.768KHZ-LRT explicitly supports this function. SIT1533AI-H4-DCC-32.768G does not specify this capability; confirm control requirements with the application before selection.

Q: Are both substitutes RoHS compliant?

A: Yes. Both ASDK-32.768KHZ-LRT and SIT1533AI-H4-DCC-32.768G are ROHS3 Compliant. The original 501BCAM032768DAGR does not specify RoHS status.

Q: What is the Moisture Sensitivity Level (MSL) difference?

A: The original part has MSL 2 (1 Year shelf life). Both substitutes have MSL 1 (Unlimited shelf life), providing superior storage stability and reduced risk of moisture-induced failures during manufacturing.