ECS-.327-12.5-34B-C-TR

Crystal, ECX-31B Series, 32.768 kHz, 10 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-31B Series
Load Capacitance: 12.5pF
Crystal Frequency: 32.768kHz
Crystal Case / Package: SMD, 3.2mm x 1.5mm
Frequency Stability + / -: -
Frequency Tolerance + / -: 10ppm
Operating Temperature Max: 85°C
Operating Temperature Min: -40°C

Delivery and price
Units per pack	9000
Price	0.25 €
Current stock	1000+
Lead time	30 days

Datasheet

## RoHS 

The miniature ECX-31B is the most cost effective SMD Tuning Fork Crystal today. The 3.2 x 1.5 x 0.9 mm ceramic package is ideal high density circuit boards. Offerings in extended temperature and frequency tolerance as low at ±10 ppm. 

## **ECX-31B SMD CRYSTAL** 

**Request a Sample** 

## **OPERATING CONDITIONS / ELECTRICAL CHARACTERISTICS** 

## **ECX-31B SMD CRYSTAL** 

**PARAMETERS CONDITIONS ECX-31B UNITS MIN TYP MAX** ~~ee~~ Frequency ~~ee~~ 32.768 KHz Frequency Tolerance @ +25°C ± 20 * ppm Temperature Coefficient -0.028 -0.034 -0.040 ppm/°C² ~~——————~~ Shunt Capacitance Co 1.05 pF ~~es~~ Load Capacitance ~~ee~~ Specify in P/N 12.5 pF ~~ee~~ Drive Level DL 0.1 1.0 μW • Low Profile Equivalent Series Resistance R1 70K Ω • 3.2 x 1.5 mm Footprint ~~eses es~~ • Extended Temp. Range ~~es~~ Insulation Resistance @ 100V DC 500M Ω • RoHS Compliant Turnover Temperature +20 +25 +30 °C • Low Power RTC Applications ~~a es es~~ such as STM32 ~~—~~ AN2867 ~~es~~ Operating Temperature Topr ~~ss~~ -40 +85 °C ~~es~~ Storage Temperature Tstg ~~ss~~ -55 +125 °C ~~es~~ Aging (First Year) ~~ee~~ @ +25°C ±3°C ±3 ppm 

## **DIMENSIONS (mm)** 

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

_**Figure 2)** Suggested Land Pattern_ 

|**ECS -  FREQUENCY ABBREVIATION**<br>**LOAD**<br>**CAPACITANCE**<br>**PART NUMBERING GUIDE:  Exam**<br>~~a~~<br>~~ee~~|**ECS -  FREQUENCY ABBREVIATION**<br>**LOAD**<br>**CAPACITANCE**<br>**PART NUMBERING GUIDE:  Exam**<br>~~a~~<br>~~ee~~|**ECS -  FREQUENCY ABBREVIATION**<br>**LOAD**<br>**CAPACITANCE**<br>**PART NUMBERING GUIDE:  Exam**<br>~~a~~<br>~~ee~~|**ECS -  FREQUENCY ABBREVIATION**<br>**LOAD**<br>**CAPACITANCE**<br>**PART NUMBERING GUIDE:  Exam**<br>~~a~~<br>~~ee~~|**PACKAGE**<br>**CUSTOM OPTIONS**<br> Tolerance<br>**_Figure 2)_**_Suggested Land Pattern_<br>**PART NUMBERING GUIDE:  Example ECS-.327-12.5-34B-TR**<br>~~es ee~~|**PACKAGE**<br>**CUSTOM OPTIONS**<br> Tolerance<br>**_Figure 2)_**_Suggested Land Pattern_<br>**PART NUMBERING GUIDE:  Example ECS-.327-12.5-34B-TR**<br>~~es ee~~|**PACKAGE**<br>**CUSTOM OPTIONS**<br> Tolerance<br>**_Figure 2)_**_Suggested Land Pattern_<br>**PART NUMBERING GUIDE:  Example ECS-.327-12.5-34B-TR**<br>~~es ee~~|**PACKAGE**<br>**CUSTOM OPTIONS**<br> Tolerance<br>**_Figure 2)_**_Suggested Land Pattern_<br>**PART NUMBERING GUIDE:  Example ECS-.327-12.5-34B-TR**<br>~~es ee~~|**PACKAGE**<br>**CUSTOM OPTIONS**<br> Tolerance<br>**_Figure 2)_**_Suggested Land Pattern_<br>**PART NUMBERING GUIDE:  Example ECS-.327-12.5-34B-TR**<br>~~es ee~~|**PACKAGE**<br>**CUSTOM OPTIONS**<br> Tolerance<br>**_Figure 2)_**_Suggested Land Pattern_<br>**PART NUMBERING GUIDE:  Example ECS-.327-12.5-34B-TR**<br>~~es ee~~|Tolerance<br>**PACKAGING**<br>_Suggested Land Pattern_|Tolerance<br>**PACKAGING**<br>_Suggested Land Pattern_|Tolerance<br>**PACKAGING**<br>_Suggested Land Pattern_|**PACKAGING**<br>_Suggested Land Pattern_|_Suggested Land Pattern_|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|.327 = 32.768  KHz<br>ECS|||12.5 = 12.5 pF<br>9 = 9 pF|||-34B = ECX-31B||Blank = ±20 ppm<br>* C = ± 10 ppm|||TR = Tape<br>& Reel||||
||||7 = 7 pF||||||||3K/Reel||||
||||6 = 6 pF||||||||||||
|*Contact ECS for availability||||||||||||Rev.2019|||



## R - S **ECX-31B** COMPLIANT **SMD CRYSTAL** 

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

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**SOLDER PROFILE** Peak solder Temp +260°C Max 10 sec Max. 2 Cycles Max. MSL 1, Lead Finish Au : (°C) +260 °CPeak +250810°C_ ! +220 °C 2 +170410 °C 5 q : — 

_**Figure 1)** Suggested Reflow Profile_

Updated at June 5, 2026

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