| Electronic component: | Description: | Manuf. | Package | Pins | T°min | T°max | Datasheet |
|---|
| LS1240 | Electronic tone ringer with built-in bridge rectifier. Supply voltage Vs=26V. Current consumption without load Ib=1.5A(typ). Activation voltage Von=12V(min),13.5V(max). Sustaining voltage Voff=8V(min),9V(max). | distributor | DIP | 8 | -20°C | 70°C | 30 K |
| LS1240A | Electronic tone ringer with built-in bridge rectifier. Supply voltage Vs=26V. Current consumption without load Ib=1.5A(typ). Activation voltage Von=12V(min),13.5V(max). Sustaining voltage Voff=7.8V(min),9.3V(max). | distributor | DIP | 8 | -20°C | 70°C | 30 K |
| SL74LS138D | 3-to-8-line decoder/demultiplexer. | distributor | SOIC | 16 | 0°C | 70°C | 33 K |
| SL74LS138N | 3-to-8-line decoder/demultiplexer. | distributor | DIP | 16 | 0°C | 70°C | 33 K |
| SL74LS14D | Hex schmitt-trigger inverter. | distributor | SOIC | 14 | 0°C | 70°C | 28 K |
| SL74LS14N | Hex schmitt-trigger inverter. | distributor | DIP | 14 | 0°C | 70°C | 28 K |
| SN54LS191 | Synchronous up/down counters with down/up mode control | Texas-Instruments | J | 16 | -55°C | 125°C | 512 K |
| SN54LS191 | Synchronous up/down counters with down/up mode control | Texas-Instruments | J | 16 | -55°C | 125°C | 512 K |
| SN74LS190 | Synchronous up/down counters with down/up mode control | Texas-Instruments | D | 16 | -55°C | 125°C | 512 K |
| SN74LS190 | Synchronous up/down counters with down/up mode control | Texas-Instruments | D | 16 | -55°C | 125°C | 512 K |
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