Part A
74HC244D
東芝セミコンダクター・アンド・ストレージ
- Lifecycle
- Active
- Stock
- 7745 個数
- Package
- SOIC-20
- Series
- ロジック - バッファ、ドライバ、レシーバ、トランシーバ
Replacement verdict
Compatible functional replacement candidate
The 74HC244D and 74HC241D,652 are both octal non-inverting buffers with 3-state outputs in the same SO-16 package, making them functionally interchangeable in many designs. However, the 74HC241D,652 features a split enable architecture with separate active-low and active-high enable pins, whereas the 74HC244D uses two active-low enables. This difference requires careful validation of the enable logic in the target circuit before substitution.
Logic Function
High match
Output Type
High match
Enable Logic
Validation required
Package Type
High match
Parts at a glance
Part B
74HC241D,652
パナソニック電子部品
- Lifecycle
- Active
- Stock
- 2734 個数
- Package
- SOIC-20
- Series
- ロジック - バッファ、ドライバ、レシーバ、トランシーバ
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 | 74HC241D,652 | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver, non-inverting, 3-state | Octal Buffer/Line Driver, non-inverting, 3-state | Both are non-inverting octal buffers with 3-state outputs, so the core logic function is equivalent for signal buffering applications. |
| Output Enable Polarity | Active LOW (single OE for all 8 outputs) | Dual: 1OE active LOW (4 outputs), 2OE active HIGH (4 outputs) | The 74HC241 has split enable control with opposite polarities, allowing independent control of two 4-bit groups, whereas the 74HC244 controls all 8 outputs with one active-LOW enable. |
| Number of Enable Pins | 1 | 2 | Different enable pin counts affect PCB routing and the ability to independently gate output groups, impacting direct pin-to-pin substitutability. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Identical supply range ensures both parts operate in the same logic-level environments and can share power rails. |
| Output Drive Current | ±6 mA (at 4.5 V) | ±6 mA (at 4.5 V) | Matching drive current means equivalent fan-out and load-driving capability for downstream circuits. |
| Propagation Delay | ~13 ns (at 4.5 V, typical) | ~13 ns (at 4.5 V, typical) | Similar propagation delay ensures comparable timing performance in high-speed signal paths. |
| Package Type | SOIC-20 (D suffix) | SOIC-20 (D suffix) | Same package footprint allows drop-in PCB compatibility without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature range supports use in the same industrial and automotive-grade environments. |
| Pin Count | 20 | 20 | Same pin count is necessary for physical compatibility, though pin functions differ due to enable configuration. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC244D | 74HC241D,652 |
|---|---|---|
| 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 are the main functional differences between the 74HC244D and the 74HC241D,652?
The 74HC244D is an octal non-inverting buffer/line driver with 3-state outputs, featuring two active-low output enable pins (1OE and 2OE). The 74HC241D,652 is an octal non-inverting buffer/line driver with 3-state outputs, but it features two active-low output enable pins that are internally inverted, meaning the outputs are enabled when the enable pins are HIGH. Both devices are functionally similar but differ in the polarity of their output enable control logic.
Are the 74HC244D and 74HC241D,652 pin-to-pin compatible?
Yes, both devices are typically offered in the same SOIC-20 package (the "D" suffix in 74HC244D and the "652" suffix in 74HC241D,652 indicate SOIC-20 packaging). They share the same pinout for inputs, outputs, and supply pins. However, the function of the output enable pins differs: on the 74HC244D, a LOW on the enable pin activates the outputs; on the 74HC241D,652, a HIGH on the enable pin activates the outputs. This difference must be accounted for in the circuit design.
Can the 74HC244D be used as a direct drop-in replacement for the 74HC241D,652?
No, they are not direct drop-in replacements because the output enable logic is inverted between the two devices. In the 74HC244D, pulling an enable pin LOW enables the corresponding outputs. In the 74HC241D,652, pulling an enable pin HIGH enables the outputs. Substituting one for the other without modifying the enable signal logic will result in incorrect output states (either always enabled or always high-impedance).
What are the typical supply voltage and logic level specifications for these devices?
Both the 74HC244D and 74HC241D,652 are part of the 74HC high-speed CMOS family. They typically operate over a supply voltage range of 2.0 V to 6.0 V. Input logic levels are CMOS-compatible: VIL (max) is typically 0.3 × VCC and VIH (min) is typically 0.7 × VCC at 4.5 V. Output drive is typically ±6 mA at 4.5 V, though exact values should be verified from the specific manufacturer datasheet (e.g., Nexperia or Texas Instruments).
What is the difference in propagation delay between the 74HC244D and the 74HC241D,652?
Both devices are from the same 74HC logic family and have similar propagation delay characteristics. Typical propagation delay (tPD) is approximately 10 ns to 15 ns at 4.5 V and 25°C, depending on load conditions. Any minor differences between manufacturers or specific part revisions should be verified from the respective datasheets. In most applications, the propagation delay difference is negligible.
What are the output drive current capabilities of these devices?
Both the 74HC244D and 74HC241D,652 typically provide an output drive current of ±6 mA at VCC = 4.5 V, with a maximum output current of ±25 mA per pin (absolute maximum rating). These values are standard for the 74HC family and should be confirmed from the manufacturer datasheet for the specific part number and package.
Which device should be chosen for a design requiring active-high output enable control?
The 74HC241D,652 should be chosen for active-high output enable control, as its enable pins are internally inverted and require a HIGH signal to activate the outputs. The 74HC244D requires a LOW signal to activate its outputs. If active-high enable is needed, the 74HC241D,652 is the appropriate choice without adding external inverters.
Are the 74HC244D and 74HC241D,652 available in the same package types?
Both devices are commonly available in SOIC-20 (suffix "D" for 74HC244D and "652" for 74HC241D,652), as well as other packages such as TSSOP-20 and DIP-20 depending on the manufacturer. The "D" and "652" suffixes specifically denote SOIC-20 packaging for the respective part numbers. Package availability may vary by manufacturer and should be verified with the distributor or manufacturer datasheet.