Part A
74HC244D
Toshiba Semiconductor và lưu trữ
- Lifecycle
- Active
- Stock
- 7745 PCS
- Package
- SOIC-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
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
NXP Hoa Kỳ Inc.
- Lifecycle
- Active
- Stock
- 6812 PCS
- Package
- SOIC-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
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 |
Frequently asked questions
What is the difference between 74HC244D and 74HC244D,653?
The 74HC244D is the base part number for a high-speed CMOS octal buffer/line driver with 3-state outputs in an SO-20 package. The 74HC244D,653 is a specific ordering variant from Nexperia that includes a tape-and-reel packing designation and is RoHS-compliant. Both share the same electrical function and package type, but the ,653 suffix indicates the packing and environmental compliance specification.
Are 74HC244D and 74HC244D,653 electrically interchangeable?
Yes. Both devices are functionally and electrically identical, featuring the same 74HC244 octal buffer/line driver with 3-state outputs, the same SO-20 package, and the same operating voltage range of 2.0 V to 6.0 V. The ,653 suffix only denotes packing and compliance differences, not electrical parameter differences.
What is the function of the 74HC244D and 74HC244D,653?
Both are octal non-inverting buffer/line drivers with 3-state outputs. They feature two 4-bit sections, each controlled by an independent output enable (OE) pin. When OE is low, the outputs are active; when OE is high, the outputs are in a high-impedance state, allowing direct connection to a bus.
What package do the 74HC244D and 74HC244D,653 use?
Both devices are supplied in a 20-pin SO (Small Outline) package, designated SO-20 or SOIC-20. The package dimensions and pinout are identical between the two variants.
What is the operating voltage range for the 74HC244D and 74HC244D,653?
The 74HC244D and 74HC244D,653 operate over a supply voltage range of 2.0 V to 6.0 V, consistent with the 74HC family specifications. This allows use in 3.3 V and 5 V logic systems.
What is the difference in packing between 74HC244D and 74HC244D,653?
The 74HC244D is typically supplied in bulk or tube form, while the 74HC244D,653 is supplied in tape-and-reel packaging. The ,653 suffix specifically indicates tape-and-reel packing, which is suitable for automated pick-and-place assembly lines.
Are the 74HC244D and 74HC244D,653 RoHS compliant?
The 74HC244D,653 is RoHS compliant and halogen-free, as indicated by the ,653 ordering suffix from Nexperia. The base 74HC244D may also be RoHS compliant depending on the manufacturer and date code, but the ,653 variant explicitly guarantees this compliance in its ordering code.
Can 74HC244D and 74HC244D,653 be used interchangeably in a PCB design?
Yes. Since both share the same SO-20 package, pinout, and electrical specifications, they are interchangeable in PCB designs. The only practical difference is the packing method, which affects assembly and procurement rather than board-level performance.