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| Part Number | SN74ALS641A-1NSR | SN74ALS645A-1NSR | SN74ALS642A-1NSR | SN74ALS621A-1NSR |
|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Status | Active | Active | Active | Obsolete |
| Logic Type | Transceiver, Inverting | Transceiver, Non-Inverting | Transceiver, Inverting | Transceiver, Non-Inverting |
| Number of Elements | 1 | 1 | 1 | 1 |
| Number of Bits per Element | 8 | 8 | 8 | 8 |
| Input Type | - | - | - | - |
| Output Type | Open Collector | 3-State | Open Collector | Open Collector |
| Current - Output High, Low | -, 24mA | 15mA, 24mA | -, 24mA | -, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) | 20-SOIC (0.209", 5.30mm Width) | 20-SOIC (0.209", 5.30mm Width) | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SO | 20-SO | 20-SO | 20-SO |
