Part A
74HC244D
Компания Toshiba Semiconductor и Storage
- Lifecycle
- Active
- Stock
- 7745 ПКС
- Package
- SOIC-20
- Series
- Логика - буферы, драйверы, приемники, передатчики
Replacement verdict
Compatible functional replacement candidate
The 74HC244D and 74HC244D,653 are functionally equivalent octal buffer/line driver ICs from the same manufacturer, sharing identical logic function, package type, and electrical characteristics. The ,653 suffix denotes a tape-and-reel packing variant, making these parts directly interchangeable in design and application.
Logic Function
High match
Package Type
High match
Supply Voltage Range
High match
Output Drive Current
High match
Parts at a glance
Part B
74HC244D,653
Компания NXP USA Inc.
- Lifecycle
- Active
- Stock
- 6812 ПКС
- Package
- SOIC-20
- Series
- Логика - буферы, драйверы, приемники, передатчики
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC244D | 74HC244D,653 | Why it matters |
|---|---|---|---|
| Manufacturer | Nexperia | Nexperia | Same manufacturer ensures identical die design and process, supporting direct substitutability. |
| Logic Family | 74HC | 74HC | Matching logic family guarantees compatible input thresholds, output drive, and speed characteristics. |
| Function | Octal buffer/line driver, 3-state | Octal buffer/line driver, 3-state | Identical logic function is essential for pin-to-pin and functional replacement in a circuit. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Same operating voltage window allows use in the same power rail without level shifting. |
| Number of Channels | 8 | 8 | Equal channel count ensures the same number of signals can be buffered or driven. |
| Output Type | 3-state | 3-state | 3-state outputs allow bus sharing and high-impedance isolation, critical for bus applications. |
| Propagation Delay (typical) | ~11 ns at 4.5 V | ~11 ns at 4.5 V | Similar propagation delay preserves timing margins in synchronous and high-speed designs. |
| Output Drive Current | ±6 mA at 4.5 V | ±6 mA at 4.5 V | Matching drive strength ensures equivalent fan-out and load-driving capability. |
| Package / Mounting | SO-20 (SOT163-1), SMD | SO-20 (SOT163-1), SMD | Same package and mounting type allow drop-in PCB replacement without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature range ensures reliability across the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC244D | 74HC244D,653 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | Buffer, Non-Inverting | Buffer, Non-Inverting |
| Number of Elements | 2 | 2 |
| Number of Bits per Element | 4 | 4 |
| Output Type | 3-State | 3-State |
| Current - Output High Low | 7.8mA, 7.8mA | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |