32.768 kHz ±20ppm Crystal 7pF SMD (12.87148)

Part Overview

The 12.87148 is a 32.768 kHz tuning fork crystal manufactured by Geyer Electronic America, Inc., designed for surface mount applications requiring precise timekeeping and frequency reference functionality. This kHz crystal operates at a fundamental frequency of 32.768 kHz with a load capacitance of 7pF and an equivalent series resistance of 50 kOhms. The component is packaged in a 2-SMD, No Lead configuration with dimensions of 0.126" L x 0.059" W (3.20mm x 1.50mm) and a maximum seated height of 0.035" (0.90mm). The part maintains an active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, supply chain alternatives, or inventory management.

Substiute Parts

12.87148

Geyer Electronic America, Inc.In Stock: 350112.87148 Datasheet

Current PartRFQ

ECS-.327-7-34R-TR

ECS Inc.In Stock: 26509ECS-.327-7-34R-TR Datasheet

Parametric EquivalentRFQ

FC-135R 32.7680KA-AG0

EPSONIn Stock: 2362FC-135R 32.7680KA-AG0 Datasheet

Parametric EquivalentRFQ

FC-135R 32.7680KA-AG3

EPSONIn Stock: 51802FC-135R 32.7680KA-AG3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 12.87148 are qualified based on strict electrical and mechanical parameter equivalence. The substitution criteria are defined by the following parameters:

• Frequency: 32.768 kHz (exact match required)
• Frequency Tolerance: ±20ppm (exact match required)
• Load Capacitance: 7pF (exact match required)
• Equivalent Series Resistance (ESR): 50 kOhms (exact match required)
• Operating Temperature Range: -40°C to 85°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, No Lead (exact match required)
• Physical Dimensions: 3.20mm L x 1.50mm W (exact match required)
• Maximum Seated Height: 0.90mm (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the main part number 12.87148 in applications requiring a 32.768 kHz tuning fork crystal with 7pF load capacitance and 50 kOhms ESR.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (ECS-.327-7-34R-TR, FC-135R 32.7680KA-AG0, and FC-135R 32.7680KA-AG3) are electrically and mechanically equivalent to the main part number 12.87148 and are suitable for direct substitution in applications requiring a 32.768 kHz tuning fork crystal with 7pF load capacitance and 50 kOhms ESR.

Compliance Considerations:

• All parts are ROHS3 compliant and suitable for applications requiring environmental compliance.
• The ECS-.327-7-34R-TR is designated as REACH Unaffected.
• Both EPSON variants (FC-135R 32.7680KA-AG0 and FC-135R 32.7680KA-AG3) are designated as REACH Affected.

Availability and Inventory:

• FC-135R 32.7680KA-AG3 (EPSON) offers the highest inventory availability at 51,788 pieces.
• ECS-.327-7-34R-TR (ECS Inc.) provides 26,456 pieces in stock.
• FC-135R 32.7680KA-AG0 (EPSON) provides 2,254 pieces in stock.
• The main part 12.87148 (Geyer) has 3,441 pieces in stock.

All parts maintain active product status and are available in Tape & Reel (TR) packaging suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the ECS-.327-7-34R-TR be used as a direct replacement for the 12.87148?

A: Yes. The ECS-.327-7-34R-TR meets all electrical and mechanical parameter requirements for direct substitution. Both parts operate at 32.768 kHz with ±20ppm tolerance, 7pF load capacitance, 50 kOhms ESR, and identical physical dimensions and temperature operating range.

Q: What is the difference between the two EPSON FC-135R variants (AG0 and AG3)?

A: Both FC-135R 32.7680KA-AG0 and FC-135R 32.7680KA-AG3 are electrically and mechanically identical. The designation difference (AG0 versus AG3) reflects manufacturing or packaging variations. Both are equivalent substitutes for the 12.87148.

Q: Are there any compliance differences between the substitute parts?

A: All substitute parts are ROHS3 compliant. The ECS-.327-7-34R-TR is REACH Unaffected, while both EPSON variants are REACH Affected. Selection should consider specific regulatory requirements for the target application.

Q: Can these crystals be used interchangeably in PCB designs?

A: Yes. All substitute parts share identical physical dimensions (3.20mm L x 1.50mm W), maximum seated height (0.90mm), and 2-SMD No Lead package configuration. PCB footprints and assembly processes require no modification.

Q: What is the significance of the 7pF load capacitance specification?

A: The 7pF load capacitance is a critical parameter that determines the crystal's frequency accuracy when connected to a specific oscillator circuit. All substitute parts are specified at 7pF, ensuring equivalent frequency performance in circuits designed for the 12.87148.

Q: Does the 50 kOhms ESR affect circuit design?

A: The 50 kOhms equivalent series resistance is a fundamental characteristic of tuning fork crystals at 32.768 kHz. All substitute parts share this specification, ensuring equivalent electrical behavior in oscillator circuits designed for this parameter.

Q: What does MSL 1 (Unlimited) mean for handling and storage?

A: Moisture Sensitivity Level 1 indicates the lowest moisture sensitivity classification. These components do not require special moisture control during storage or handling, simplifying logistics and inventory management.