Part A
74HC153D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 5590 PCS
- Package
- SOIC-20
- Series
- Logic - Signal Switches, Multiplexers, Decoders
Replacement verdict
Not a drop-in replacement
The 74HC14D,653 and 74HC153D are not functionally interchangeable despite sharing the same 74HC logic family and SO14 package. The 74HC14D,653 is a hex inverting Schmitt trigger, while the 74HC153D is a dual 4-input multiplexer. Their internal logic functions, input/output configurations, and pin assignments are fundamentally different, making direct substitution impossible without circuit redesign.
Different logic function
Different input configuration
Different output configuration
Different pin assignment
Parts at a glance
Part B
74HC14D,653
Nexperia USA Inc.
- Lifecycle
- Active
- Stock
- 3794 PCS
- Package
- SOIC-14
- Series
- Logic - Gates and Inverters
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC14D,653 | 74HC153D | Why it matters |
|---|---|---|---|
| Logic Function | Hex inverting Schmitt trigger | Dual 4-input multiplexer | The core logic function determines whether the device can perform the intended signal processing role; these two parts are functionally unrelated and not substitutable. |
| Number of Circuits | 6 | 2 | The number of independent channels affects how many signals can be processed per package and the required board space. |
| Number of Inputs per Circuit | 1 | 4 | Input count per circuit defines the logic capability, such as whether the device can select among multiple data sources. |
| Output Type | Push-pull | Push-pull | Output type affects drive capability and compatibility with connected loads; both are push-pull but serve different logic roles. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | The supply voltage range must match the system rail to ensure proper logic levels and reliable operation. |
| Propagation Delay | Approximately 13 ns at 4.5 V | Approximately 14 ns at 4.5 V | Propagation delay influences maximum operating speed and timing margins in synchronous or time-critical circuits. |
| Package Type | SO14 | SO16 | Package type and pin count determine PCB footprint and soldering compatibility; different packages are not drop-in replacements. |
| Pin Count | 14 | 16 | Pin count must match the board layout; a mismatch prevents direct substitution without redesign. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range ensures the device operates reliably in the target environment, such as industrial or automotive applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC153D | 74HC14D,653 |
|---|---|---|
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Type | Multiplexer | - |
| Circuit | 2 x 4:1 | - |
| Independent Circuits | 2 | - |
| Current - Output High Low | 5.2mA, 5.2mA | 5.2mA, 5.2mA |
| Voltage Supply Source | Single Supply | - |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Logic Type | - | Inverter |
| Number of Circuits | - | 6 |
| Number of Inputs | - | 1 |
| Features | - | Schmitt Trigger |
| Current - Quiescent (Max) | - | 2 µA |
| Logic Level - Low | - | 0.3V ~ 1.2V |
| Logic Level - High | - | 1.5V ~ 4.2V |
| Max Propagation Delay @ V Max CL | - | 21ns @ 6V, 50pF |
Frequently asked questions
What are the primary functional differences between the 74HC14D,653 and the 74HC153D?
The 74HC14D,653 is a hex inverting Schmitt trigger, providing six independent inverter channels with hysteresis for noise immunity and signal conditioning. The 74HC153D is a dual 4-input multiplexer, which selects one of four data inputs per channel based on two select lines and routes the selected signal to a single output. They serve fundamentally different logic functions and are not interchangeable.
Can the 74HC14D,653 and 74HC153D be used in the same circuit?
Yes, they can be used together in the same circuit because they perform complementary functions. The 74HC14D,653 can clean up noisy input signals, while the 74HC153D can multiplex multiple digital signals onto a single line. Both operate from a 2 V to 6 V supply and are compatible with standard CMOS logic levels.
Do the 74HC14D,653 and 74HC153D have the same package and pinout?
No. The 74HC14D,653 is supplied in a 14-pin SOIC package (D suffix) with a standard hex inverter pinout. The 74HC153D is supplied in a 16-pin SOIC package (D suffix) with a dual multiplexer pinout. They have different pin counts and pin functions, so they are not pin-to-pin compatible.
What are the supply voltage and logic level specifications for both devices?
Both the 74HC14D,653 and 74HC153D are 74HC-family CMOS devices. They operate over a recommended supply voltage range of 2 V to 6 V. Input logic levels are CMOS-compatible, with switching thresholds that scale with the supply voltage. The 74HC14D,653 additionally provides Schmitt-trigger hysteresis on all inputs.
Which device is better for debouncing a mechanical switch?
The 74HC14D,653 is better suited for debouncing a mechanical switch because its Schmitt-trigger inputs provide hysteresis, which cleanly transitions the output even with slow or noisy input edges. The 74HC153D is a multiplexer and does not provide hysteresis; it would require an external debouncing network or a preceding Schmitt trigger.
Can the 74HC153D be used to select between multiple Schmitt-triggered signals?
Yes. The 74HC153D can multiplex four data inputs per channel onto one output. If the input signals are first conditioned by a 74HC14D,653 or similar Schmitt trigger, the 74HC153D can then select among those cleaned-up signals. The two devices are often used together in signal-routing applications.
Are the 74HC14D,653 and 74HC153D RoHS compliant and lead-free?
Both the 74HC14D,653 and 74HC153D are offered in SOIC packages that are RoHS compliant and lead-free, as specified in manufacturer datasheets and distributor listings. However, always verify the specific ordering code and date code against the latest manufacturer documentation before finalizing a design.
What are typical propagation delays for these devices?
For the 74HC14D,653, the typical propagation delay is approximately 10 ns to 15 ns at 4.5 V, depending on the transition direction and load. For the 74HC153D, the typical propagation delay from data or select inputs to output is approximately 12 ns to 20 ns at 4.5 V. Actual values vary with supply voltage, temperature, and load capacitance, and should be confirmed from the manufacturer datasheet.