Part A
74HC573D
東芝電晶體與存儲
- Lifecycle
- Active
- Stock
- 3424 件
- Package
- SOIC-14
- Series
- 邏輯-鎖存器
Replacement verdict
Not a drop-in replacement
The 74HC573D and 74HC541D,653 are not functionally interchangeable despite sharing the 74HC logic family and SOIC-20 footprint. The 74HC573D is an octal D-type transparent latch with 3-state outputs, while the 74HC541D,653 is an octal non-inverting buffer/line driver with 3-state outputs. Their internal logic functions, control pin assignments, and latching behavior differ fundamentally, so direct substitution is not possible without circuit redesign.
Different logic function
Different control pinout
Different latching behavior
Different input/output topology
Parts at a glance
Part B
74HC541D,653
恩智浦美國股份有限公司。
- Lifecycle
- Active
- Stock
- 6304 件
- Package
- SOIC-20
- Series
- 邏輯-緩衝器、驅動器、接收器、收發器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC573D | 74HC541D,653 | Why it matters |
|---|---|---|---|
| Logic Function | Octal D-type transparent latch with 3-state outputs | Octal buffer/line driver with 3-state outputs | Determines the fundamental behavior: the 74HC573D stores data (latch), while the 74HC541D only buffers/drives signals without storage, so they are not functionally interchangeable. |
| Number of Bits | 8 | 8 | Both handle 8 bits, so bus width compatibility is maintained between the two devices. |
| Output Type | 3-state | 3-state | 3-state outputs allow the device to be disconnected from a shared bus, which is essential for bus multiplexing in both parts. |
| Control Inputs | Latch Enable (LE) and Output Enable (OE) | Output Enable (OE1, OE2) | The 74HC573D requires a latch enable to capture data, whereas the 74HC541D only needs output enables; this changes the control logic and timing in a circuit. |
| Propagation Delay (typical at 5V) | ~13 ns | ~12 ns | Similar delay values mean timing performance is comparable, but the latch function adds setup/hold requirements not present in the buffer. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both support the same wide voltage range, ensuring compatibility with 3.3 V and 5 V logic systems. |
| Output Drive Current (at 5V) | ±6 mA | ±6 mA | Identical drive strength means both can drive similar loads, but the buffer is often chosen for higher fan-out in line driving applications. |
| Package | SOIC-20 (D) | SOIC-20 (D) | Same package footprint allows physical drop-in replacement on a PCB, though the functional difference still prevents direct substitution. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Both meet industrial temperature requirements, so environmental robustness is equivalent. |
| Input Clamp Diodes | Yes | Yes | Clamp diodes protect inputs from voltage spikes, providing similar ruggedness in both devices. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC573D | 74HC541D,653 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | D-Type Latch | Buffer, Non-Inverting |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |
| Output Type | Tri-State | 3-State |
| Current - Output High Low | 7.8mA, 7.8mA | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Circuit | 8:8 | - |
| Independent Circuits | 1 | - |
| Delay Time - Propagation | 26ns | - |
Frequently asked questions
What are the primary functional differences between the 74HC573D and the 74HC541D,653?
The 74HC573D is an octal D-type transparent latch with 3-state outputs, featuring a latch enable (LE) and output enable (OE) control. The 74HC541D,653 is an octal non-inverting buffer/line driver with 3-state outputs, featuring two output enable inputs (OE1 and OE2). The 74HC573D can capture and hold data, while the 74HC541D only provides buffering without latching capability.
Are the 74HC573D and 74HC541D,653 pin-compatible?
No. The 74HC573D and 74HC541D,653 have different pin configurations. The 74HC573D uses pin 11 as the latch enable (LE) and pin 1 as the output enable (OE). The 74HC541D,653 uses pins 1 and 19 as output enable inputs (OE1 and OE2). Pin assignments for data inputs and outputs also differ, so they are not direct drop-in replacements.
Can the 74HC573D be used as a direct substitute for the 74HC541D,653 in an existing design?
No. Although both are octal 3-state devices in similar packages, the 74HC573D is a latch and the 74HC541D,653 is a non-latching buffer. The control logic, pinout, and timing behavior differ. A direct substitution without redesign or validation against the original manufacturer datasheets is not recommended.
What are the output drive capabilities of the 74HC573D and 74HC541D,653?
Both devices are 74HC series CMOS logic. Per standard 74HC specifications, they typically provide ±6 mA output drive at 5 V VCC and ±4 mA at 4.5 V VCC. For exact limits, refer to the specific manufacturer datasheet, as drive strength may vary slightly between manufacturers.
What supply voltage range do the 74HC573D and 74HC541D,653 support?
Both the 74HC573D and 74HC541D,653 are 74HC family devices and operate over a supply voltage range of 2.0 V to 6.0 V. They are not 5 V tolerant beyond VCC, and input voltages should not exceed the supply voltage per standard 74HC input protection rules.
What is the difference in control inputs between the 74HC573D and the 74HC541D,653?
The 74HC573D has a latch enable (LE) input that controls data transparency and a single output enable (OE) input. The 74HC541D,653 has two output enable inputs (OE1 and OE2) that must both be active to enable the outputs. The 74HC541D,653 has no latch enable input.
Which device is better for capturing and holding data on a bus?
The 74HC573D is the appropriate choice for capturing and holding data because it includes a transparent D-type latch. The 74HC541D,653 cannot hold data; it only buffers or drives signals when enabled. For bus holding or demultiplexing applications, the 74HC573D is required.
Do the 74HC573D and 74HC541D,653 have the same package and pin count?
Both are commonly available in a 20-pin SOIC package (the "D" suffix in 74HC573D and the "D" in 74HC541D,653 typically denotes SOIC). However, pin count alone does not ensure compatibility. The pin functions and internal logic differ, so they are not interchangeable despite sharing the same package footprint.