Part A
74LVC2G17DW-7
La société diodes
- Lifecycle
- Active
- Stock
- 2242 PCS
- Package
- TSSOP-6
- Series
- Logique - Buffers, lecteurs, récepteurs, émetteurs - récepteurs
Replacement verdict
Not a drop-in replacement
The 74LVC2G17DW-7 and 74LVC244ATTR are not functionally interchangeable. The 74LVC2G17DW-7 is a dual Schmitt-trigger buffer with two channels in a small SOT-363 package, while the 74LVC244ATTR is an octal non-inverting buffer/line driver with 3-state outputs in a TSSOP-20 package. They differ in channel count, output type, package footprint, and input threshold characteristics, making direct substitution impractical without significant design changes.
Different channel count
Different output type
Different footprint
Different input threshold
Parts at a glance
Part B
74LVC244ATTR
Semi - conducteurs optiques
- Lifecycle
- Active
- Stock
- 5927 PCS
- Package
- TSSOP-20
- Series
- Logique - Buffers, lecteurs, récepteurs, émetteurs - récepteurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74LVC2G17DW-7 | 74LVC244ATTR | Why it matters |
|---|---|---|---|
| Logic Function | Dual Buffer with Schmitt-Trigger Inputs | Octal Buffer/Line Driver with 3-State Outputs | Determines the core signal-conditioning behavior and whether the device can drive a bus or only buffer a signal. |
| Number of Channels | 2 | 8 | Channel count dictates how many independent signal lines can be handled by a single package. |
| Output Type | Push-Pull | 3-State | 3-state outputs allow bus sharing and high-impedance isolation, while push-pull outputs cannot be tied together. |
| Input Type | Schmitt-Trigger | Standard CMOS | Schmitt-trigger inputs provide hysteresis for slow or noisy signals, improving noise immunity compared to standard inputs. |
| Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 3.6 V | The usable supply window affects compatibility with 5 V, 3.3 V, and 1.8 V logic systems. |
| Package / Mounting | SOT-363 (SC-70-6), Surface Mount | TSSOP-20, Surface Mount | Footprint and pin count must match the PCB layout for a drop-in replacement. |
| Propagation Delay (typ.) | ~3.2 ns at 3.3 V | ~4.5 ns at 3.3 V | Propagation delay influences maximum operating frequency and timing margins in synchronous designs. |
| Output Drive Current | ±32 mA | ±24 mA | Drive strength determines fan-out capability and the ability to drive low-impedance loads or long traces. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The temperature range affects suitability for automotive, industrial, or extended-environment applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LVC2G17DW-7 | 74LVC244ATTR |
|---|---|---|
| Supplier | - | STMicroelectronics |
| Series | 74LVC | 74LVC |
| Part Status | Active | Obsolete |
| Logic Type | Buffer, Non-Inverting | Buffer, Non-Inverting |
| Number of Elements | 2 | 2 |
| Number of Bits per Element | 1 | 4 |
| Output Type | Push-Pull | 3-State |
| Current - Output High Low | 32mA, 32mA | 24mA, 24mA |
| Voltage - Supply | 1.65V ~ 5.5V | 1.65V ~ 3.6V |
| Operating Temperature | -40°C ~ 125°C (TA) | -55°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Input Type | Schmitt Trigger | - |
Frequently asked questions
What are the primary functional differences between the 74LVC2G17DW-7 and the 74LVC244ATTR?
The 74LVC2G17DW-7 is a dual non-inverting Schmitt-trigger buffer, while the 74LVC244ATTR is an octal non-inverting buffer/line driver with 3-state outputs. The 74LVC2G17DW-7 provides two independent channels with Schmitt-trigger inputs for signal conditioning, whereas the 74LVC244ATTR provides eight channels with 3-state outputs for bus-oriented applications.
How do the input threshold characteristics differ between these two devices?
The 74LVC2G17DW-7 features Schmitt-trigger inputs with defined hysteresis (typically 0.2 V to 0.4 V at VCC = 3.0 V), making it suitable for slow or noisy input signals. The 74LVC244ATTR has standard CMOS input thresholds without specified hysteresis, requiring fast edge rates for proper operation.
What are the output drive capabilities of each device?
Both devices are specified with ±24 mA output drive at VCC = 3.0 V per the 74LVC family standard. The 74LVC2G17DW-7 provides this drive on two outputs, while the 74LVC244ATTR provides it on eight outputs, subject to total package power dissipation limits.
Do both devices support 3-state output functionality?
No. The 74LVC244ATTR includes 3-state outputs controlled by two active-low output enable pins (1OE and 2OE), allowing high-impedance state for bus sharing. The 74LVC2G17DW-7 does not have 3-state outputs; its outputs are always active.
What are the package and pin count differences between the 74LVC2G17DW-7 and 74LVC244ATTR?
The 74LVC2G17DW-7 is supplied in a 6-pin SOT-363 (SC-88) package. The 74LVC244ATTR is supplied in a 20-pin TSSOP package. These packages are not footprint-compatible and require different PCB land patterns.
Can the 74LVC2G17DW-7 and 74LVC244ATTR operate from the same supply voltage range?
Yes. Both devices are members of the 74LVC family and are specified for a supply voltage range of 1.65 V to 5.5 V, with the caveat that AC and DC characteristics vary with VCC as defined in the respective manufacturer datasheets.
Are these two devices interchangeable in a design without modification?
No. They differ in channel count, package footprint, pinout, output configuration (3-state vs. non-3-state), and input threshold behavior. A direct substitution is not possible without redesigning the PCB and validating the logic function against the target application requirements.
Which device is more appropriate for bus interface applications?
The 74LVC244ATTR is more appropriate for bus interface applications because its 3-state outputs allow multiple devices to share a common bus. The 74LVC2G17DW-7 lacks 3-state capability and is better suited for signal buffering, waveform shaping, and Schmitt-trigger input conditioning.