Tuning Fork Crystal

(former NC26LF, NC38LF)

KT26, KT38

DATASHEET

7/29/2020

– KT26 ESR updated to 35kohms.

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Title / Description:

Drawing Number: KT26-KT38-DOC-1

Revision: B

Part Number:

Cage: 61429

Draftsperson: BEC

Approved: MAJ

Revision Date: 10/19/2020

Crystal Unit Handling Precautions

1) Mounting Precautions

•

Structure – Cylinder crystals are hermetically sealed using glass to metal seals (see figs 1 and 2)

•

Unbending the lead

(1) DO NOT pull the lead excessively if unbending a lead or removing a crystal unit. The excessive force may crack

the glass and reduce the degree of vacuum. This may eventually result in deterioration of the characteristics and

may also break the crystal chip (see Figure 3).

(2) Unbend the lead by pressing on the bent part from both the upper and lower sides while holding the bottom of

lead tightly (see Figure 4).

•

Bending the lead

(1) Bend the lead so that the lead will remain straight for more than 0.5mm from the case when soldering a crystal

unit after bending. If not, the glass may be cracked (see Figures 5 and 6).

(2) Always leave a length greater than 2.0mm when bending a lead after soldering (see Figure 7)

Soldering directly to the case will reduce the degree of vacuum and may result in deterioration of the characteristics and may break

the crystal chip.

Make the length from the case to the printed circuit board (L) longer than the case diameter (D) so that the lead wire will not be

pulled in case the crystal unit falls over.

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