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 74HC125D and 74HC153D are functionally unrelated logic ICs and cannot serve as substitutes for one another. The 74HC125D provides four independent non-inverting buffers with 3-state outputs, while the 74HC153D is a dual 4-to-1 multiplexer with non-3-state outputs. Their internal logic functions, pin assignments, and control schemes differ fundamentally, so neither device can directly replace the other in an existing design.
Different logic function
Different output type
Different channel count
Different pinout
Parts at a glance
Part B
74HC125D
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 3803 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 | 74HC125D | 74HC153D | Why it matters |
|---|---|---|---|
| Logic Function | Quad Buffer/Line Driver with 3-State Outputs | Dual 4-Input Multiplexer | The core logic function determines whether the devices are functionally interchangeable; these are fundamentally different functions and cannot substitute for each other. |
| Number of Channels | 4 | 2 | Channel count affects how many independent signals can be processed, impacting board layout and circuit design. |
| Output Type | 3-State | Push-Pull | 3-state outputs allow bus sharing and high-impedance isolation, while push-pull outputs cannot be tied together, affecting bus architectures. |
| Inputs per Channel | 1 | 4 | The number of selectable inputs per channel defines the multiplexing capability and signal routing flexibility. |
| Control Inputs | Output Enable (active LOW) | Select (A, B) and Strobe (active LOW) | Different control schemes require different driving logic and timing considerations in the surrounding circuit. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Both devices share the same HC-family supply range, allowing operation from common 3.3 V or 5 V rails. |
| Propagation Delay (typical at 5 V) | ~11 ns | ~14 ns | Propagation delay affects maximum operating frequency and timing margins in synchronous designs. |
| Package | SO14 (SOIC-14) | SO16 (SOIC-16) | Package footprint and pin count must match the PCB layout; different packages are not drop-in compatible. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Matching temperature ranges ensure both parts meet the same environmental requirements for industrial and automotive applications. |
| Logic Family | 74HC (High-Speed CMOS) | 74HC (High-Speed CMOS) | Same logic family ensures compatible input thresholds, output drive levels, and noise immunity when interfacing with other HC devices. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC153D | 74HC125D |
|---|---|---|
| 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 functions of the 74HC125D and 74HC153D?
The 74HC125D is a quad non-inverting 3-state buffer/line driver with active-low output enable pins. The 74HC153D is a dual 4-input multiplexer that selects one of four data inputs per multiplexer based on two select inputs and provides both true and complementary outputs.
Can the 74HC125D and 74HC153D be used interchangeably in a design?
No. They perform fundamentally different logic functions. The 74HC125D provides buffering with 3-state outputs, while the 74HC153D performs data selection (multiplexing). They are not pin-compatible or functionally equivalent.
What are the package and pin count differences between the 74HC125D and 74HC153D?
Both devices are typically offered in a 16-pin SOIC package (the "D" suffix in NXP/Philips naming denotes SOIC). The 74HC125D uses 16 pins for four buffers with individual output enables, while the 74HC153D uses 16 pins for two 4-input multiplexers with shared select lines and complementary outputs.
What are the supply voltage and logic level specifications for these devices?
Both the 74HC125D and 74HC153D are HC-family CMOS devices typically specified for a supply voltage range of 2.0 V to 6.0 V. They provide CMOS logic levels and are compatible with standard 5 V TTL systems when operated at 5 V.
How do the output drive capabilities of the 74HC125D and 74HC153D compare?
Both devices typically provide symmetrical CMOS output drive. Standard 74HC family outputs are specified to drive 4 mA at 5 V (with typical capability of 5.2 mA). The 74HC125D 3-state outputs and the 74HC153D multiplexer outputs have similar drive strengths within the same logic family.
What is the difference in propagation delay between the 74HC125D and 74HC153D?
Propagation delay depends on supply voltage and load. At 5 V, the 74HC125D typically exhibits a propagation delay of approximately 10 ns to 15 ns. The 74HC153D, due to its internal multiplexer routing, typically exhibits a slightly longer propagation delay of approximately 14 ns to 20 ns at 5 V. Exact values should be verified from the specific manufacturer datasheet.
Which device is better for bus isolation and which for data selection?
The 74HC125D is intended for bus isolation, signal buffering, and 3-state bus driving because its outputs can be placed in a high-impedance state. The 74HC153D is intended for data selection and multiplexing, routing one of several inputs to a single output based on select signals.
Are the 74HC125D and 74HC153D available in the same temperature grade?
Yes. Both devices are typically available in the standard industrial temperature range of -40 °C to +85 °C (or -40 °C to +125 °C for some automotive-qualified versions). The specific grade depends on the manufacturer and ordering part number.