Part A
74HC14D,653
Nexperia Hoa Kỳ Inc.
- Lifecycle
- Active
- Stock
- 3794 PCS
- Package
- SOIC-14
- Series
- Logic - Gates and Inverters
Replacement verdict
Not a drop-in replacement
The 74HC14D,653 and 74HC154D,653 are not functionally interchangeable despite sharing the same 74HC logic family and SO-16 package. The 74HC14D,653 is a hex inverting Schmitt-trigger device, while the 74HC154D,653 is a 4-to-16 line decoder/demultiplexer. Their logic functions, input/output configurations, and pin assignments differ fundamentally, so substituting one for the other is not feasible without a complete circuit redesign.
Different logic function
Different input/output type
Different pin assignment
Different channel count
Parts at a glance
Part B
74HC154D,653
NXP Hoa Kỳ Inc.
- Lifecycle
- Active
- Stock
- 4133 PCS
- Package
- SOIC-24
- Series
- Logic - Signal Switches, Multiplexers, Decoders
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 | 74HC154D,653 | Why it matters |
|---|---|---|---|
| Logic Function | Hex inverting Schmitt trigger | 4-to-16 line decoder/demultiplexer | The two devices perform completely different logic functions, so they are not functionally interchangeable in a circuit. |
| Number of Channels / Outputs | 6 inverters | 16 outputs | Channel count determines how many signals can be processed or selected, directly affecting circuit architecture. |
| Input Type | Schmitt trigger inputs | Standard CMOS inputs | Schmitt trigger inputs provide hysteresis for noise immunity and slow signal edges, which standard inputs do not. |
| Output Type | Inverting | Active LOW selected output | Output polarity and behavior must match the intended logic to avoid inverted or incorrect system operation. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Both parts operate over the same HC-family supply range, allowing use in similar 2–6 V logic systems. |
| Logic Family | 74HC | 74HC | Same logic family implies compatible voltage thresholds and drive characteristics. |
| Package | SO14 (SOIC-14) | SO24 (SOIC-24) | Package footprint and pin count must match the PCB layout; these differ, so they are not drop-in compatible. |
| Mounting Type | Surface mount | Surface mount | Both are surface-mount devices, suitable for the same assembly processes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings allow use in the same industrial and automotive environments. |
| Manufacturer | Nexperia | Nexperia | Same manufacturer ensures consistent quality, documentation, and supply chain characteristics. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC14D,653 | 74HC154D,653 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Type | - | Decoder/Demultiplexer |
| Circuit | - | 1 x 4:16 |
| Independent Circuits | - | 1 |
| 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 ~ 125°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 74HC154D,653?
The 74HC14D,653 is a hex inverting Schmitt trigger, providing six independent inverter channels with hysteresis for noise immunity and signal conditioning. The 74HC154D,653 is a 4-to-16 line decoder/demultiplexer, which takes a 4-bit binary input and activates one of 16 mutually exclusive outputs. They serve entirely different logic functions and are not interchangeable.
Are the 74HC14D,653 and 74HC154D,653 pin-compatible?
No. The 74HC14D,653 is typically supplied in a 14-pin SOIC package, while the 74HC154D,653 is supplied in a 24-pin SOIC package. Pin counts, pin assignments, and package dimensions differ, so they cannot be used as drop-in replacements for each other on the same PCB footprint.
Can the 74HC14D,653 be used to drive the inputs of the 74HC154D,653?
Yes, provided the logic levels and supply voltages are compatible. Both devices are members of the 74HC family and typically operate from 2 V to 6 V. The 74HC14D,653 can clean up noisy or slow-edged signals before they reach the address inputs of the 74HC154D,653, but the system designer must verify fan-out, propagation delay, and input current limits per the respective datasheets.
What is the function of the Schmitt trigger hysteresis in the 74HC14D,653?
The 74HC14D,653 provides positive-going and negative-going threshold voltages that differ, creating hysteresis. This makes the device suitable for converting slowly changing or noisy input signals into clean, sharp digital outputs, and for use in oscillator and debounce circuits. The 74HC154D,653 does not include Schmitt trigger inputs.
How many outputs does the 74HC154D,653 provide and how are they selected?
The 74HC154D,653 provides 16 mutually exclusive active-LOW outputs. A 4-bit binary address applied to inputs A0 through A3 selects which one of the 16 outputs is active. Two enable inputs (E1 and E2) must both be LOW for the selected output to be active; otherwise all outputs remain HIGH.
Do both devices operate over the same supply voltage range?
Yes. Both the 74HC14D,653 and the 74HC154D,653 are 74HC-series CMOS devices and are specified for a typical supply voltage range of 2 V to 6 V. However, AC and DC characteristics, input thresholds, and output drive strengths should be confirmed from the manufacturer datasheet for the specific operating conditions of the application.
Which device is better suited for expanding microcontroller I/O?
The 74HC154D,653 is better suited for output expansion because it decodes a 4-bit address into 16 individual output lines, allowing a microcontroller to control many peripherals with few pins. The 74HC14D,653 is intended for signal conditioning, inversion, and oscillation, not for I/O expansion.
Are the 74HC14D,653 and 74HC154D,653 available in the same package type?
Both devices are offered in SOIC packages by Nexperia, but in different pin counts: the 74HC14D,653 in a 14-pin SOIC and the 74HC154D,653 in a 24-pin SOIC. They are not package-compatible despite sharing the same package family designation.