DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
These Nine-Digit Calculator Numeric Seven-Segment LED Displays are intended for use under pulsed conditions by enabling the common cathode of each digit sequentially and enabling the desired Segment and Decimal Point anodes in phase with the character enabling pulse. The pulse rate is kept high enough so that light from each character appears to the eye to be constant.
The SK-3-307 Nine-Digit display assembly uses Chip-on-Board (COB) technology with each character formed by bonding a tiny LED chip integrating both their seven Segment Bars and Decimal Point directly to a ceramic substrate and both protecting and magnifying them with a one-piece lens.
The leftmost character of the featured display is not populated.
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• 0.08”/2.0 mm Characters • Seven-Segment Digits with Right-Hand Decimals • Continuous Uniform Segments • Common-Cathode Configuration for Multiplex Applications • 0.200”/5.1 mm Character Spacing • Integrated Clear Plastic Lens |
| Type | Products | Digits | Comments |
| SK-3-307 | Canon LE-83 |
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| Type | Products | Relationship | Comments |
| LAB-B-2 | Canon LE-83 | Second Source | R.ohm |
| Item | Min | Typ | Max | Unit | Comments |
| Display Width |
2.37 60.2 |
inch mm |
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| Display Height |
0.75 19.0 |
inch mm |
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| Display Depth |
0.25 6.3 |
inch mm |
Including Printed Circuit Board, without Pins |
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| Substrate Thickness |
0.04 1.0 |
inch mm |
White ceramic | ||
| Lens Width |
2.16 55.0 |
inch mm |
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| Lens Height |
0.50 12.7 |
inch mm |
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| Lens Depth |
0.21 5.3 |
inch mm |
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| Character Height |
0.080 2.00 |
inch mm |
At 0.4" / 10 mm Viewing
Distance w/o lens 0.040" / 1.00 mm |
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| Character Width |
0.063 1.60 |
inch mm |
w/o Decimal Point w/o lens 0.031" / 0.80 mm |
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| Character Slant Angle |
7.5 | degrees | |||
| Character Spacing |
0.200 5.08 |
inch mm |
The displays are formed by bonding monolithic GaAsP (Gallium Arsenide Phosphide) LED chips integrating one character with seven Segment Bars and one Decimal Point, each directly to a ceramic substrate and placing a one-piece clear acrylic magnifying lens with cylindrical shaped surface on top of the assembly with four heat stakes.
The die size of the LED chip is approximately 44 mils * 40 mils / 1.1 mm * 1.0 mm, the magnification of the lens is about 2.0 at a viewing distance of 0.4" / 10 mm.
The SK-3-307 uses a 2.37" / 60.2 mm by 0.75” / 19.0 mm rectangular ceramic substrate with 17 solder tabs with a 0.1” / 2.54 mm pitch arranged on the bottom of the display module.
| Pin | Pol. | Function |
| 1 | C | Digit 9 (Minus Sign) |
| 2 | A | C Segments |
| 3 | C | Digit 8 (MSD) |
| 4 | A | Decimal Points |
| 5 | C | Digit 7 |
| 6 | A | A Segments |
| 7 | C | Digit 6 |
| 8 | A | E Segments |
| 9 | C | Digit 5 |
| 10 | A | D Segments |
| 11 | C | Digit 4 |
| 12 | A | G Segments |
| 13 | C | Digit 3 |
| 14 | A | B Segments |
| 15 | C | Digit 2 |
| 16 | A | F Segments |
| 17 | C | Digit 1 (LSD) |
| The Anode of the Segments A-G and Right-Hand Decimals and the Cathode of the Digits 1-9 are connected to the display in the pictured way. |
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If you have additions to the above datasheet please email: joerg@datamath.org.
© Joerg Woerner, January 9, 2022. No reprints
without written permission.
