FC-135R 32.7680KA-AC Equivalent & Substitute Parts

Part Overview

The FC-135R 32.7680KA-AC is a 32.768 kHz tuning fork crystal manufactured by EPSON, designed for precision timing applications requiring low-frequency oscillation. This surface-mount component operates across the industrial temperature range of -40°C to 85°C and maintains frequency tolerance of ±20ppm. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts may be required due to inventory constraints, design optimization for specific ESR requirements, or package size considerations in space-constrained applications.

Substiute Parts

FC-135R 32.7680KA-AC

EPSONIn Stock: 1095FC-135R 32.7680KA-AC Datasheet

Current PartRFQ

FC1610AN 32.7680KA-AC

EPSONIn Stock: 1082FC1610AN 32.7680KA-AC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The FC1610AN 32.7680KA-AC qualifies as a direct substitute based on the following critical parameters:

• Frequency Match: Both parts operate at 32.768 kHz with identical ±20ppm tolerance
• Load Capacitance Match: Both specify 9pF load capacitance
• Operating Mode: Both operate in fundamental mode
• Temperature Range: Both support -40°C to 85°C operation
• Package Compatibility: Both use 2-SMD, No Lead surface-mount packaging
• Compliance Alignment: Both are ROHS3 compliant with MSL 1 rating

The primary difference between these parts is the Equivalent Series Resistance (ESR): FC-135R specifies 50 kOhms while FC1610AN specifies 90 kOhms. Additionally, FC1610AN features a smaller physical footprint (1.65mm x 1.05mm vs. 3.20mm x 1.50mm) and reduced height (0.50mm vs. 0.90mm).

Parameter Comparison

Engineering Selection Recommendations

Both FC-135R and FC1610AN are active production components from EPSON with identical regulatory compliance profiles (ROHS3, MSL 1, EAR99 ECCN classification). Selection between these parts should be based on circuit-specific ESR requirements and physical space constraints:

• FC-135R (50 kOhms ESR): Select when circuit design specifies lower ESR characteristics or when the larger footprint (3.20mm x 1.50mm) is acceptable within PCB layout constraints.

• FC1610AN (90 kOhms ESR): Select for space-constrained applications requiring compact form factor (1.65mm x 1.05mm) and reduced height (0.50mm). The higher ESR value must be compatible with oscillator circuit design parameters.

Both parts maintain identical frequency stability, load capacitance, and operating temperature specifications, ensuring functional equivalence in timing-critical applications.

Frequently Asked Questions (FAQ)

Q: Can FC1610AN replace FC-135R in existing designs without circuit modification?

A: Functional replacement is possible if the oscillator circuit design accommodates the 90 kOhms ESR specification of FC1610AN. ESR directly affects oscillation startup characteristics and power consumption. Circuit validation is necessary to confirm compatibility with the higher ESR value.

Q: What are the physical space implications of substitution?

A: FC1610AN occupies significantly less PCB area (1.65mm x 1.05mm vs. 3.20mm x 1.50mm) and has reduced height (0.50mm vs. 0.90mm). This makes FC1610AN suitable for high-density layouts or applications with vertical space constraints. Both parts use identical 2-SMD, No Lead surface-mount packaging, ensuring compatible pick-and-place handling.

Q: Are there compliance or regulatory differences between these parts?

A: No. Both parts carry identical ROHS3 compliance, MSL 1 rating, EAR99 ECCN classification, and HTSUS code (8541.60.0010). Regulatory and environmental compliance profiles are equivalent.

Q: How do frequency tolerance specifications compare?

A: Both parts specify ±20ppm frequency tolerance across the -40°C to 85°C operating range. Frequency stability performance is identical between FC-135R and FC1610AN.

Q: What determines substitution suitability?

A: Substitution is determined by matching frequency (32.768 kHz), frequency tolerance (±20ppm), load capacitance (9pF), operating mode (fundamental), temperature range (-40°C to 85°C), and package type (2-SMD, No Lead). ESR and physical dimensions are secondary selection criteria based on specific application requirements.