| HEC4538BT | Dual precision monostable multivibrator | Datasheet*) |
| HEF4538BD | Dual precision monostable multivibrator | Datasheet*) |
| HEF4538BDB | Dual precision monostable multivibrator | Datasheet*) |
| HEF4538BP | Dual precision monostable multivibrator | Datasheet*) |
| HEF4538BPB | Dual precision monostable multivibrator | Datasheet*) |
| HEF4538BT | Dual precision monostable multivibrator | Datasheet*) |
| HEF4538BU | Dual precision monostable multivibrator | Datasheet*) |