| Electronic component: | Description: | Manuf. | Package | Pins | T°min | T°max | Datasheet |
|---|
| HEF4519BU | Quadruple 2-input multiplexer | Philips-Semiconductors | - | - | - | - | 41 K |
| HEF4520BD | Dual binary counter | Philips-Semiconductors | SOT74 | - | - | - | 64 K |
| HEF4520BP | Dual binary counter | Philips-Semiconductors | SOT38 | - | - | - | 64 K |
| HEF4520BPB | Dual binary counter | Philips-Semiconductors | SOT38 | - | - | - | 64 K |
| HEF4520BPB | Dual binary counter | Philips-Semiconductors | SOT38 | - | - | - | 64 K |
| HEF4520BT | Dual binary counter | Philips-Semiconductors | SOT109 | - | - | - | 64 K |
| HEF4520BU | Dual binary counter | Philips-Semiconductors | - | - | - | - | 64 K |
| HEF4521BD | 24-stage frequency divider and oscillator | Philips-Semiconductors | SOT74 | - | - | - | 159 K |
| HEF4521BDB | 24-stage frequency divider and oscillator | Philips-Semiconductors | SOT74 | - | - | - | 159 K |
| HEF4521BP | 24-stage frequency divider and oscillator | Philips-Semiconductors | SOT38 | - | - | - | 159 K |
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