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| HT81003 | EasyVoice 3-second speech (mask ROM) | Holtek Semiconductor Inc. | DIP | 16 | -20°C | 70°C | HT81003 datasheet (136K) |
| HT812D0 | 2.8 second LOG-PCM speech | Holtek Semiconductor Inc. | DIP | 16 | -20°C | 70°C | HT812D0 datasheet (614K) |
| HT812D0 | 2.8 second LOG-PCM speech | Holtek Semiconductor Inc. | SOP | 16 | -20°C | 70°C | HT812D0 datasheet (614K) |
| HT812L0 | 2.8 second enhanced tone voice | Holtek Semiconductor Inc. | DIP | 16 | -20°C | 70°C | HT812L0 datasheet (391K) |
| HT813D0 | 5.6 second LOG-PCM speech | Holtek Semiconductor Inc. | SOP | 16 | -20°C | 70°C | HT813D0 datasheet (574K) |
| HT813D0 | 5.6 second LOG-PCM speech | Holtek Semiconductor Inc. | DIP | 16 | -20°C | 70°C | HT813D0 datasheet (574K) |
| HT814D0 | 8.4 second LOG-PCM speech | Holtek Semiconductor Inc. | DIP | 20 | -20°C | 70°C | HT814D0 datasheet (162K) |
| HT814D0 | 8.4 second LOG-PCM speech | Holtek Semiconductor Inc. | SOP | 20 | -20°C | 70°C | HT814D0 datasheet (162K) |
| HT814D0 | 8.4 second LOG-PCM speech | Holtek Semiconductor Inc. | SOP | 24 | -20°C | 70°C | HT814D0 datasheet (162K) |
| HT814D0 | 8.4 second LOG-PCM speech | Holtek Semiconductor Inc. | DIP | 24 | -20°C | 70°C | HT814D0 datasheet (162K) |