Panasonic ASCT1F46E manual Standard dimensions for the Hole and Land diameter

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14.PC board design

2.Hole and Land diameter

3.Expansion and shrinkage of copper-clad laminates

12

The Hole and Land diameter are made with the hole slightly larger than the lead wire so that the component may be inserted easily. Also, when soldering, the solder will build up in an eyelet condition, increasing the mounting strength. The standard dimensions for the Hole diameter and Land are shown in the table below.

Standard dimensions for the Hole and Land diameter

Unit: mm/ inch

Standard Hole

Tolerance

Land diameter

di

t

 

 

0.8/ .031

 

2.0 to 3.0/ .079 to .118

 

 

 

1.0/ .039

±0.1/ ±.039

 

 

 

 

1.2/ .047

3.5 to 4.5/ .138 to .177

 

 

 

 

1.6/ .063

 

 

 

 

 

 

 

Remarks

The Hole diameter is made 0.2 to 0.5mm/ .008 to .020inch larger than the lead diameter. However, if the jet method (wave type, jet type) of soldering is used, solder may pass through to the component side. Therefore, it is more suitable to make the Hole diameter equal to the lead diameter +0.2mm.

The Land diameter should be 2 to 3 times the Hole diameter.

Do not put more than 1 lead in one hole.

Because copper-clad laminates have a longitudinal and lateral direction, the manner of punching fabrication and layout must be observed with care. Expansion and shrinkage in the longitudinal direction due to heat is 1/15 to 1/2 of that in the lateral, and accordingly, after the punching fabrication, the distortion in the longitudinal direction will be 1/15 to 1/2 of that in the lateral direction. The mechanical strength in the longitudinal direction is 10 to 15% greater than that in the lateral direction. Because of this difference between the longitudinal and lateral directions, when products having long configurations are to be fabricated, the lengthwise direction of the configuration should be made in the longitudinal direction, and PC boards having a connector section should be made with the connector along the longitudinal side.(The figure below)

Example: As shown in the drawing below, the 150mm (5.906 inch) direction is taken in the longitudinal direction.

Also, as shown in the drawing below, when the pattern has a connector section, the direction is taken as shown by the arrow in the longitudinal direction.

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Contents Page Category Section ContentsAutomotive Relay User’s GuidePanasonic Electric Works Other lamp load Motor load Capacitor load Load, Electrical life Load voltage Coil voltage Delays the release time to 5 times the release time listed Short current Connection method Avoid Darlington circuit connections. High amplification Schmitt circuit Snap action circuit Wave shaping circuit(No good ) Darlington connection Good Emitter connection Residual Coil Voltage When used for temperature control circuits or similar oneVoltage Usage ambient condition Temperature Consideration Standard dimensions for the Hole and Land diameter Flux Application Mounting of RelaySoldering Automatic Soldering Cooling Cleaning CoatingHand Soldering Features and Effects What is a Surface Mount Relay? From IMT to SMTInsertion Mount Technology & Surface Mount Technology Paste Soldering Examples of SMT ApplicationsRelay mounting Reflow Cooling / Cleaning Transported Intrinsic Reliability and Reliability of Use Reliability in a Board Sense of the TermReliability Measures Failure Rate Degree of ReliabilitySafe Life Bathtub Curve Failure What is Failure?Weibull Analysis Check sheet 1/2 Check sheet 2/2

ASCT1F46E specifications

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