ECS-.327-12.5-12RR-TR

Crystal, ECX-12RR Series, 32.768 kHz, 20 ppm, 12.5 pF

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Manufacturer: ECS INC INTERNATIONAL
Product type: Crystals
SVHC: No SVHC (04-Feb-2026)
Frequency Nom: 32.768kHz
Product Range: ECX-12RR Series
Load Capacitance: 12.5pF
Crystal Frequency: 32.768kHz
Crystal Case / Package: SMD, 2mm x 1.2mm
Frequency Stability + / -: -
Frequency Tolerance + / -: 20ppm
Operating Temperature Max: 85°C
Operating Temperature Min: -40°C

Delivery and price
Units per pack	500
Price	0.599 €
Current stock	1000+
Lead time	30 days

Datasheet

The ultra-miniature ECX-12RR is a very compact SMD Tuning Fork Crystal.  The 2.0 x 1.2 x 0.6 mm ceramic package with reduced ESR is ideal for IoT and Wearale technology. 

## **ECX-12RR 32.768 KHz SMD Tuning Fork Crystal Low ESR** 

## **ECX-12RR SMD CRYSTAL** 

- Low ESR 50K Ohms Max. 

- 2.0 x 1.2 mm Footprint 

- Low Power RTC Applications such as STM32 AN2867 

- RoHS Compliant 

- Applications:  Metering, Automotive, Industrial, IOT and Wearables. 

## **OPERATING CONDITIONS / ELECTRICAL CHARACTERISTICS** 

**PARAMETERS CONDITIONS ECX-12RR UNITS MIN TYP MAX** ~~ee~~ Frequency ~~ee Ge~~ 32.768 ~~ee es~~ KHz Frequency Tolerance @ +25°C ± 20 ppm ~~——~~ Load Capacitance Specify in P/N 12.5 pF Drive Level DL 0.1 0.5 μW ~~a es tn I~~ Equivalent Series Resistance R1 35K 50K Ω Turnover Temperature +20 +25 +30 °C ~~—~~ Temperature Coefficient -0.030 -0.040 ppm/°C² Shunt Capacitance Co 1.7 2.0 pF ~~—~~ Aging (First Year) @ +25°C ±3°C ±3 ppm Operating Temperature Topr -40 +85 °C ~~ee~~ Storage Temperature Tstg -40 +85 °C 

## **DIMENSIONS (mm)** 

|**PAD CONNECTIONS**|**PAD CONNECTIONS**|
|---|---|
|1|In/Out|
|2|Out/In|



_**Figure 1)** Top, Side, and Bottom views_ 

_**Figure 2)** Suggested Land Pattern_ 

## **PART NUMBERING GUIDE:  Example ECS-.327-12.5-12RR-TR** 

|**ECS       FREQUENCY ABBREVIATION**<br>~~a~~|**ECS       FREQUENCY ABBREVIATION**<br>~~a~~|**ECS       FREQUENCY ABBREVIATION**<br>~~a~~|**LOAD CAPACITANCE**|**PACKAGE**|**PACKAGE**|||**PACKAGING**|**PACKAGING**|
|---|---|---|---|---|---|---|---|---|---|
||ECS|.327 = 32.768  KHz|12.5 = 12.5 pF<br>9 = 9 pF||-12RR = ECX-12RR||||TR = Tape<br>& Reel|
||||6 = 6 pF||||||3K/Reel|



Rev.2018 

**32.768 KHz SMD Tuning Fork Crystal Low ESR** 

## [= S **ECX-12RR** 

## **POCKET TAPE DIMENSIONS (mm)** 

ate [e [ors [tw | tesa. | are sa ieee se] es| em) | 

**SOLDER PROFILE** Peak solder Temp +260°C Max 10 sec Max. 2 Cycles Max. MSL 1, Lead Finish Au 

_**Figure 1)** Suggested Reflow Profile_

Updated at June 5, 2026

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