Part A
74HC153D
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 5590 PCS
- Package
- SOIC-20
- Series
- Logique - commutateurs de signaux, multiplexeurs, décodeurs
Replacement verdict
Not a drop-in replacement
The 74HC126D and 74HC153D are functionally unrelated logic ICs and cannot serve as substitutes for one another. The 74HC126D provides four independent non-inverting buffers with 3-state outputs, while the 74HC153D is a dual 4-to-1 multiplexer with complementary outputs. Their differing logic functions, channel configurations, output structures, and pin assignments make direct replacement impossible without redesigning the surrounding circuit.
Different logic function
Different channel count
Different output type
Different pinout
Parts at a glance
Part B
74HC126D
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 7257 PCS
- Package
- SOIC-14
- 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 | 74HC126D | 74HC153D | Why it matters |
|---|---|---|---|
| Logic Function | Quad Buffer with 3-State Outputs | Dual 4-Input Multiplexer | The core logic function determines whether the parts are functionally interchangeable; these devices perform entirely different operations. |
| Number of Channels | 4 | 2 | Channel count affects how many independent signal paths can be handled per package. |
| Output Type | 3-State | Push-Pull | 3-state outputs allow bus sharing, while push-pull outputs cannot be tied together without contention. |
| Inputs per Channel | 1 | 4 | The number of selectable inputs per channel defines the multiplexing capability of the device. |
| Control Inputs | Output Enable (per channel) | Select (A, B) and Strobe | Different control schemes require different driving logic and timing considerations in a circuit. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both parts operate over the standard HC-family supply range, allowing use in similar power environments. |
| Package | SO14 | SO16 | Package footprint and pin count must match the PCB layout for physical compatibility. |
| Logic Family | 74HC | 74HC | Same logic family ensures compatible voltage thresholds, drive strength, and speed characteristics. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Matching temperature ranges confirm both parts suit the same environmental conditions. |
| Pin Count | 14 | 16 | Different pin counts mean the devices are not drop-in replacements on the same PCB footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC153D | 74HC126D |
|---|---|---|
| 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 | 7.8mA, 7.8mA |
| Voltage Supply Source | Single Supply | - |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Logic Type | - | Buffer, Non-Inverting |
| Number of Elements | - | 4 |
| Number of Bits per Element | - | 1 |
| Output Type | - | 3-State |
Frequently asked questions
What are the primary functional differences between the 74HC126D and the 74HC153D?
The 74HC126D is a quad non-inverting buffer/line driver with 3-state outputs, while the 74HC153D is a dual 4-input multiplexer. The 74HC126D provides four independent buffer channels with active-HIGH output enable pins, whereas the 74HC153D selects one of four data inputs per multiplexer based on two select lines and provides non-inverted output.
Can the 74HC126D and 74HC153D be used interchangeably in a circuit design?
No. They perform fundamentally different logic functions. The 74HC126D is a 3-state buffer intended for signal buffering and bus driving, while the 74HC153D is a multiplexer intended for data selection. Substitution requires a complete redesign of the surrounding circuitry and is not a direct replacement.
What are the package and pin count specifications for both devices?
Both the 74HC126D and 74HC153D are typically offered in a 16-pin SOIC package (the "D" suffix in Nexperia and similar manufacturer naming conventions denotes SOIC-16). The 74HC126D uses 16 pins for four buffers with enable controls, VCC, and GND. The 74HC153D uses 16 pins for two 4-input multiplexers, shared select lines, and VCC/GND.
What are the supply voltage and logic level characteristics of these devices?
Both devices are members of the 74HC family and operate over a supply voltage range of 2.0 V to 6.0 V. They provide CMOS-level inputs and outputs compatible with standard 74HC logic thresholds. At VCC = 4.5 V, both devices typically exhibit a propagation delay in the range of 10 ns to 20 ns depending on load conditions, as specified in manufacturer datasheets.
How do the output drive capabilities of the 74HC126D and 74HC153D compare?
Both devices are specified with standard 74HC output drive. At VCC = 4.5 V, each output typically sinks or sources up to 4 mA while maintaining valid logic levels, with absolute maximum output current ratings per pin defined in the manufacturer datasheet. The 74HC126D 3-state outputs are designed for bus driving, while the 74HC153D outputs are standard push-pull CMOS outputs.
What is the function of the enable pins on the 74HC126D compared to the select pins on the 74HC153D?
On the 74HC126D, each buffer has an active-HIGH output enable pin (1OE through 4OE). When an enable pin is LOW, the corresponding output enters a high-impedance state. On the 74HC153D, the select pins (S0 and S1) are shared between both multiplexers and determine which of the four data inputs (I0 to I3) is routed to the corresponding output. The 74HC153D also has separate active-LOW enable pins (1E and 2E) for each multiplexer.
Are the 74HC126D and 74HC153D compatible with 74HCT, 74LS, or 74LVC logic families?
Both devices are 74HC CMOS devices with standard CMOS input thresholds. They are generally compatible with 74HCT and 74LS outputs when operated at the same supply voltage, but level compatibility must be verified against the specific datasheet parameters. Direct interfacing with 74LVC may require level shifting due to differing supply voltage ranges and input thresholds.
What are the typical applications for the 74HC126D versus the 74HC153D?
The 74HC126D is typically used for bus buffering, signal isolation, and driving capacitive or low-impedance loads where 3-state control is required. The 74HC153D is typically used for data selection, signal routing, and implementing combinational logic functions where one of several inputs must be selected based on control signals.