32.768 kHz ±20ppm Crystal 9pF SMD (12.87149)

Part Overview

The 12.87149 is a 32.768 kHz tuning fork crystal manufactured by Geyer Electronic America, Inc., designed for real-time clock (RTC) and low-frequency timing applications. This surface-mount device operates at a fundamental frequency of 32.768 kHz with a load capacitance of 9pF and an equivalent series resistance (ESR) of 70 kOhms. The part is RoHS3 compliant, carries an unlimited moisture sensitivity level (MSL 1), and is currently in active production status with 3507 units in stock.

Substitute parts are necessary when the original manufacturer part becomes unavailable, when supply chain constraints require alternative sourcing, or when design flexibility permits selection from multiple qualified suppliers. All substitute parts listed maintain electrical and mechanical compatibility with the original specification.

Key Parameters

Parameter	Value	Unit
Frequency	32.768	kHz
Frequency Tolerance	±20	ppm
Load Capacitance	9	pF
Equivalent Series Resistance (ESR)	70	kOhms
Operating Temperature Range	-40 to 85	°C
Package Type	2-SMD, No Lead	—
Physical Dimensions	3.20 × 1.50	mm
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of 32.768 kHz SMD crystals is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Frequency: 32.768 kHz (exact match required)
Frequency Tolerance: ±20 ppm (exact match required)
Load Capacitance: 9 pF (exact match required)
Equivalent Series Resistance: 70 kOhms (exact match required)
Package Type: 2-SMD, No Lead (exact match required)
Physical Dimensions: 3.20 mm × 1.50 mm (exact match required)
Operating Mode: Fundamental (exact match required)
Mounting Type: Surface Mount (exact match required)

Acceptable Variation Parameters:

Operating Temperature Range: Substitute parts may extend the upper or lower temperature limit beyond the original specification without affecting substitutability
Height (Seated): Minor variations (0.026" to 0.035" / 0.65 mm to 0.90 mm) are acceptable provided the part fits within the PCB assembly envelope
Packaging Format: Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats are interchangeable for component selection purposes
RoHS Compliance Status: Both ROHS3 and RoHS compliant parts are acceptable
REACH Status: Both REACH Affected and REACH Unaffected parts are acceptable

All substitute parts listed meet these criteria and are direct functional equivalents suitable for replacement in applications requiring a 32.768 kHz ±20ppm 9pF SMD crystal.

Parameter Comparison

Manufacturer	Part Number	Series	Frequency (kHz)	Tolerance (ppm)	Load Cap (pF)	ESR (kOhms)	Temp Range (°C)	Height Max (mm)	Packaging	Stock (Pcs)
Geyer Electronic America, Inc.	12.87149	KX-327NHT	32.768	±20	9	70	-40 to 85	0.90	Tape & Reel (TR)	3507
TXC CORPORATION	9HT10-32.768KDZC-T	9HT10	32.768	±20	9	70	-40 to 85	0.85	Tape & Reel (TR)	11549
Micro Crystal AG	CM7V-T1A-32.768KHZ-9PF-20PPM-TA-QC	CM7V	32.768	±20	9	70	-40 to 85	0.65	Tape & Reel (TR)	2375
Micro Crystal AG	CM7V-T1A-LOW-ESR-32.768KHZ-9PF-20-TA-QC	CM7V	32.768	±20	9	70	-40 to 85	0.65	Tape & Reel (TR)	1766
Seiko Instruments	SC32S-9PF20PPM	SC32S	32.768	±20	9	70	-40 to 85	0.85	Tape & Reel (TR)	24052
Abracon LLC	ABS07-32.768KHZ-9-H-T	ABS07	32.768	±20	9	70	-40 to 125	0.90	Tape & Reel (TR)	83923
Abracon LLC	ABS07-32.768KHZ-9-T	ABS07	32.768	±20	9	70	-40 to 85	0.90	Cut Tape (CT) & Digi-Reel®	14540
Micro Crystal AG	CC7V-T1A-32.768KHZ-9PF-20PPM-TA-QC	CC7V	32.768	±20	9	70	-40 to 85	0.90	Tape & Reel (TR)	1007
Citizen Finedevice Co Ltd	CM315D32768DZCT	CM315D	32.768	±20	9	70	-40 to 85	0.90	Cut Tape (CT) & Digi-Reel®	30400
ECS Inc.	ECS-.327-9-34B-TR	ECX-31B	32.768	±20	9	70	-40 to 85	0.90	Tape & Reel (TR)	111200
EPSON	FC-135 32.7680KA-AC0	FC-135	32.768	±20	9	70	-40 to 85	0.90	Cut Tape (CT) & Digi-Reel®	159907

Engineering Selection Recommendations

All substitute parts listed are functionally equivalent to the 12.87149 and meet the electrical and mechanical requirements for direct replacement. Selection among available substitutes should be based on the following factors:

Supply Availability: ECS Inc. (ECS-.327-9-34B-TR) offers the highest inventory level at 111,200 units, followed by EPSON (FC-135 32.7680KA-AC0) at 159,907 units. These options provide the greatest supply security for high-volume applications.

Compliance Certification: All substitute parts carry ROHS3 compliance or equivalent RoHS certification. The EPSON FC-135 32.7680KA-AC0 is marked as REACH Affected; applications subject to REACH restrictions should select from REACH Unaffected alternatives such as TXC CORPORATION (9HT10-32.768KDZC-T), Micro Crystal AG (CM7V or CC7V series), Seiko Instruments (SC32S-9PF20PPM), Abracon LLC (ABS07 series), or Citizen Finedevice (CM315D32768DZCT).

Operating Temperature Extension: The Abracon LLC ABS07-32.768KHZ-9-H-T extends the upper operating temperature to 125°C, providing additional thermal margin for applications operating in elevated ambient conditions.

Physical Height Optimization: Micro Crystal AG CM7V series parts (CM7V-T1A-32.768KHZ-9PF-20PPM-TA-QC and CM7V-T1A-LOW-ESR-32.768KHZ-9PF-20-TA-QC) offer the lowest seated height at 0.65 mm, suitable for space-constrained PCB designs.

Packaging Format Flexibility: Cut Tape (CT) & Digi-Reel® format parts (Abracon ABS07-32.768KHZ-9-T, Citizen CM315D32768DZCT, and EPSON FC-135 32.7680KA-AC0) provide alternative handling options for lower-volume or manual assembly operations.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 12.87149 with any of the listed parts without circuit modification?

A: Yes. All listed substitute parts maintain identical electrical parameters (32.768 kHz frequency, ±20 ppm tolerance, 9 pF load capacitance, and 70 kOhms ESR) and identical package dimensions (3.20 mm × 1.50 mm, 2-SMD No Lead). No circuit modifications are required. Minor variations in seated height (0.65 mm to 0.90 mm) do not affect electrical performance or PCB assembly compatibility.

Q: What is the significance of the ±20 ppm frequency tolerance specification?

A: The ±20 ppm tolerance defines the maximum frequency deviation from the nominal 32.768 kHz value across the operating temperature range and component lifetime. This specification is critical for real-time clock applications where timing accuracy directly impacts system performance. All substitute parts maintain this identical tolerance specification.

Q: Are Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats interchangeable for component procurement?

A: Both packaging formats contain identical components with the same electrical and mechanical specifications. The difference is in the delivery format: Tape & Reel is optimized for automated pick-and-place assembly, while Cut Tape & Digi-Reel® provides flexibility for lower-volume or mixed-component orders. Selection depends on assembly process requirements, not component performance.

Q: Does the 70 kOhms ESR specification vary among substitute parts?

A: No. All substitute parts listed maintain the identical 70 kOhms ESR specification. This parameter is critical for circuit design and oscillator stability. The ESR value determines the crystal's ability to drive the oscillator circuit and must remain constant across all substitutes.

Q: What is the difference between ROHS3 Compliant and RoHS Compliant designations?

A: ROHS3 refers to the third iteration of the Restriction of Hazardous Substances directive, which includes additional restricted substances beyond the original RoHS specification. Both designations indicate compliance with hazardous substance restrictions. Parts marked as either ROHS3 or RoHS Compliant are acceptable for use in regulated applications.

Q: Why do some substitute parts show extended operating temperature ranges (e.g., -40°C to 125°C)?

A: Extended temperature ranges indicate that the component has been qualified and tested to operate reliably beyond the original specification. The Abracon ABS07-32.768KHZ-9-H-T, for example, extends the upper limit to 125°C. This provides additional design margin for applications operating in elevated ambient conditions. The extended range does not affect substitutability; the part remains fully compatible with circuits designed for the original -40°C to 85°C range.

Q: What does MSL 1 (Unlimited) moisture sensitivity level mean?

A: MSL 1 indicates the lowest moisture sensitivity classification, meaning the component can be stored indefinitely without special moisture control measures. This simplifies inventory management and reduces handling requirements compared to higher MSL ratings. All substitute parts listed carry either MSL 1 (Unlimited) or are not subject to moisture sensitivity restrictions.

Q: How should I select among multiple substitute parts with identical electrical specifications?

A: Selection criteria include supply availability (inventory levels), compliance certifications (REACH status), physical dimensions (seated height for space-constrained designs), packaging format (Tape & Reel vs. Cut Tape), and operating temperature range (extended range for thermal margin). All listed parts are electrically and mechanically equivalent; the choice depends on application-specific requirements and supply chain considerations.

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