32.768 kHz ±20ppm Crystal 12.5pF SMD (Geyer Electronic America 12.87170)

Part Overview

The Geyer Electronic America 12.87170 is a 32.768 kHz tuning fork crystal oscillator designed for real-time clock (RTC) and timing applications. This surface-mount device operates at a fundamental frequency of 32.768 kHz with a frequency tolerance of ±20ppm and a load capacitance of 12.5pF. The part is housed in a 2-SMD, No Lead package measuring 1.60mm × 1.00mm with a maximum seated height of 0.50mm. The device is RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and is currently in active production status. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and environmental operating parameters to ensure direct interchangeability in circuit applications.

Key Parameters

Parameter	Value
Frequency	32.768 kHz
Frequency Tolerance	±20ppm
Load Capacitance	12.5pF
ESR (Equivalent Series Resistance)	90 kOhms
Operating Mode	Fundamental
Operating Temperature Range	-40°C to 85°C
Mounting Type	Surface Mount
Package / Case	2-SMD, No Lead
Size / Dimension	0.063" L × 0.039" W (1.60mm × 1.00mm)
Height - Seated (Max)	0.020" (0.50mm)
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the Geyer Electronic America 12.87170 are qualified based on the following critical parameters:

Electrical Specifications:

Frequency: 32.768 kHz (exact match required)
Frequency Tolerance: ±20ppm (exact match required)
Load Capacitance: 12.5pF (exact match required)
ESR: 90 kOhms (exact match required)
Operating Mode: Fundamental (exact match required)

Environmental & Mechanical Specifications:

Operating Temperature Range: -40°C to 85°C (exact match required)
Package Type: 2-SMD, No Lead (exact match required)
Physical Dimensions: 1.60mm × 1.00mm (exact match required)
Maximum Seated Height: 0.50mm (exact match required)
Mounting Type: Surface Mount (exact match required)

Compliance & Certifications:

RoHS3 Compliance (required for substitution)
ECCN: EAR99 (export classification)
HTSUS: 8541.60.0010 or 8541.60.0080 (tariff classification)

All substitute parts listed below meet these criteria and are direct functional equivalents suitable for circuit-level replacement without design modification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency	Frequency Tolerance	Load Capacitance	ESR	Operating Temperature	Package	Size (mm)	Height (mm)	RoHS Status	MSL	Packaging Type	Inventory (Pcs)
12.87170	Geyer Electronic America, Inc.	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	1 (Unlimited)	Tape & Reel (TR)	5226
830065253	Würth Elektronik	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	Not Applicable	Tape & Reel (TR)	3505
9HT12-32.768KDZF-T	TXC CORPORATION	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS Compliant	1 (Unlimited)	Tape & Reel (TR)	19056
ABS05-32.768KHZ-T	Abracon LLC	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	Not Applicable	Cut Tape (CT) & Digi-Reel®	147411
CM1610H32768DZFT	Citizen Finedevice Co Ltd	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	1 (Unlimited)	Tape & Reel (TR)	5027
CS1610-A-32.768K	Transko Electronics, Inc.	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	1 (Unlimited)	Tape & Reel (TR)	15753
ECS-.327-12.5-16-TR	ECS Inc.	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	1 (Unlimited)	Tape & Reel (TR)	509030
ECS-.327-12.5-16-TR3	ECS Inc.	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	1 (Unlimited)	Tape & Reel (TR)	74187
LFXTAL065253	IQD Frequency Products	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	Not Applicable	Tape & Reel (TR)	5324
MXT1BFI32K768	Meritek	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	1 (Unlimited)	Tape & Reel (TR)	3872
SC16S-12.5PF20PPM	Seiko Instruments	32.768 kHz	±20ppm	12.5pF	90 kOhms	-40°C ~ 85°C	2-SMD, No Lead	1.60 × 1.00	0.50	RoHS3	1 (Unlimited)	Tape & Reel (TR)	2627

Engineering Selection Recommendations

All substitute parts listed are qualified equivalents meeting the electrical, mechanical, and environmental specifications of the Geyer Electronic America 12.87170. Selection among these alternatives is based on the following factors:

Product Status & Availability: All substitute parts maintain active production status, ensuring long-term availability and supply chain continuity. Inventory levels vary by manufacturer and distributor; ECS-.327-12.5-16-TR and ABS05-32.768KHZ-T demonstrate the highest stock levels (509,030 and 147,411 units respectively), providing supply security for high-volume applications.

Compliance & Certifications: All substitute parts are RoHS3 compliant, meeting environmental and hazardous substance restrictions. ECCN classification (EAR99) is consistent across all parts, indicating standard commercial export status. HTSUS tariff classifications are either 8541.60.0010 or 8541.60.0080, both applicable to quartz crystal oscillators.

Moisture Sensitivity & Handling: Parts with MSL 1 (Unlimited) rating—including the original Geyer part, TXC 9HT12-32.768KDZF-T, Citizen CM1610H32768DZFT, Transko CS1610-A-32.768K, ECS variants, Meritek MXT1BFI32K768, and Seiko SC16S-12.5PF20PPM—require no special moisture control during storage and handling. Parts with MSL Not Applicable (Würth 830065253, Abracon ABS05-32.768KHZ-T, IQD LFXTAL065253) are not subject to moisture sensitivity limitations.

Packaging Considerations: The majority of substitute parts are supplied in Tape & Reel (TR) format, matching the original part's packaging. Abracon ABS05-32.768KHZ-T is supplied in Cut Tape (CT) & Digi-Reel® format, suitable for applications requiring smaller order quantities or alternative reel configurations.

Series & Product Line Alignment: Substitute parts represent established product lines from recognized manufacturers: Würth IQXC-90 series, TXC 9HT12 series, Abracon ABS05 series, Citizen CM1610H series, ECS ECX-16 series, IQD IQXC-90 series, Meritek MXT1 series, and Seiko SC16S series. Each series maintains consistent electrical and mechanical specifications across product variants.

Frequently Asked Questions (FAQ)

Q: What determines if a crystal oscillator can substitute for the Geyer 12.87170?

A: Direct substitution requires exact matching of frequency (32.768 kHz), frequency tolerance (±20ppm), load capacitance (12.5pF), ESR (90 kOhms), operating temperature range (-40°C to 85°C), package type (2-SMD, No Lead), and physical dimensions (1.60mm × 1.00mm with 0.50mm maximum height). All listed substitute parts meet these criteria.

Q: Are there differences in performance between the main part and substitutes?

A: All substitute parts are parametrically equivalent to the Geyer 12.87170 within the specified electrical and environmental operating ranges. Performance differences, if any, are within the ±20ppm frequency tolerance specification and are not distinguishable in typical RTC and timing applications.

Q: Can I use parts with different MSL ratings interchangeably?

A: Yes. MSL (Moisture Sensitivity Level) differences do not affect electrical performance or circuit compatibility. Parts with MSL 1 (Unlimited) and parts with MSL Not Applicable are both suitable for direct substitution. MSL differences only impact storage and handling procedures; they do not affect the part's function once soldered to the circuit board.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect circuit performance?

A: No. Packaging format affects only the delivery and handling method, not electrical or mechanical performance. Tape & Reel (TR) packaging is standard for high-volume production; Cut Tape (CT) & Digi-Reel® packaging is suitable for lower-volume or mixed-component orders. The physical part itself is identical regardless of packaging format.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant, meeting the Restriction of Hazardous Substances Directive requirements. This ensures compatibility with modern manufacturing processes and regulatory requirements across global markets.

Q: What is the significance of the ECCN and HTSUS classifications?

A: ECCN (Export Control Classification Number) EAR99 indicates that the part is subject to standard commercial export controls with no specific licensing requirements. HTSUS (Harmonized Tariff Schedule of the United States) classifications 8541.60.0010 and 8541.60.0080 are tariff codes used for customs and trade purposes. These classifications do not affect circuit compatibility or performance.

Q: Can I mix substitute parts from different manufacturers in the same production run?

A: Yes. All substitute parts are parametrically equivalent and interchangeable at the circuit level. Mixing parts from different manufacturers in the same production run does not affect circuit performance, provided all parts meet the specified electrical and mechanical parameters. However, for traceability and quality control purposes, many manufacturers prefer to use a single source per production batch.

Q: Which substitute part offers the best supply availability?

A: ECS-.327-12.5-16-TR demonstrates the highest inventory level at 509,030 units, followed by Abracon ABS05-32.768KHZ-T at 147,411 units. These parts are recommended for applications requiring immediate availability or high-volume procurement. TXC 9HT12-32.768KDZF-T (19,056 units) and Transko CS1610-A-32.768K (15,753 units) also provide substantial inventory levels.

Q: Are there any electrical performance differences between fundamental mode and other operating modes?

A: All parts listed operate in fundamental mode, which is the standard operating mode for 32.768 kHz timing crystals. Fundamental mode operation ensures stable, predictable frequency output suitable for RTC and timing applications. No alternative operating modes are available for these specifications.

Q: What is the typical application for a 32.768 kHz crystal?

A: The 32.768 kHz frequency is the standard for real-time clock (RTC) circuits because 32,768 = 2^15, allowing simple binary division to produce a 1 Hz output signal. These crystals are commonly used in microcontrollers, digital watches, data loggers, and any application requiring accurate timekeeping with minimal power consumption.

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