Part A
74HCT4051D
Toshiba Semiconductor và lưu trữ
- Lifecycle
- Active
- Stock
- 1430 PCS
- Package
- SOP-16
- Series
- Interface - Analog Switches, Multiplexers, Demultiplexers
Replacement verdict
Not a drop-in replacement
The 74HCT4051D and 74HCT112DB,112 are functionally unrelated devices and cannot serve as substitutes for one another. The 74HCT4051D is an 8-channel analog multiplexer/demultiplexer, while the 74HCT112DB,112 is a dual negative-edge-triggered J-K flip-flop with preset and clear. Their differing logic functions, channel configurations, and package formats make direct replacement infeasible without complete circuit redesign.
Different logic function
Different channel count
Different package type
Different pin configuration
Parts at a glance
Part B
74HCT112DB,112
NXP Hoa Kỳ Inc.
- Lifecycle
- Active
- Stock
- 4556 PCS
- Series
- Logic - Flip Flops
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HCT4051D | 74HCT112DB,112 | Why it matters |
|---|---|---|---|
| Function | 8-channel analog multiplexer/demultiplexer | Dual JK flip-flop with set and reset | These devices perform fundamentally different logic functions, so they are not functionally interchangeable in a circuit. |
| Logic Family | HCT (high-speed CMOS, TTL-compatible) | HCT (high-speed CMOS, TTL-compatible) | Both belong to the HCT family, giving similar input threshold and drive characteristics, but this alone does not make them substitutes. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate from a standard 5 V logic supply, so power-rail compatibility is equivalent. |
| Number of Channels / Flip-Flops | 1 multiplexer with 8 channels | 2 JK flip-flops | Channel and storage-element counts differ, affecting how many signals each device can route or store. |
| Control Inputs | 3 select inputs, 1 enable input | Clock, set, reset, and J/K inputs per flip-flop | The control interface is completely different, so pinout and driving logic are not compatible. |
| Output Type | Analog/digital bidirectional signal path | Digital complementary outputs (Q, Qbar) | One device passes analog or digital signals, while the other provides latched digital outputs, limiting substitutability. |
| Package | SO16 (SOIC-16) | SSOP-16 (DB package) | Different package footprints prevent direct board-level replacement without layout changes. |
| Propagation Delay | Typically around 10 ns at 5 V | Typically around 20 ns at 5 V | Timing differences affect high-speed signal routing and clocked logic performance. |
| Primary Application | Signal routing, multiplexing, and demultiplexing | Data storage, counting, and clocked logic | Their intended use cases are unrelated, so one cannot directly replace the other in a design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT4051D | 74HCT112DB,112 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | 74HCT |
| Part Status | Active | Active |
| Function | - | Set(Preset) and Reset |
| Type | - | JK Type |
| Output Type | - | Complementary |
| Number of Elements | - | 2 |
| Number of Bits per Element | - | 1 |
| Clock Frequency | - | 64 MHz |
| Max Propagation Delay @ V Max CL | - | 35ns @ 4.5V, 50pF |
| Trigger Type | - | Negative Edge |
| Current - Output High Low | - | 4mA, 4mA |
| Voltage - Supply | - | 4.5V ~ 5.5V |
| Current - Quiescent (Iq) | - | 4 µA |
| Input Capacitance | - | 3.5 pF |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Multiplexer / Demultiplexer Circuit | 8:1 | - |
| Number of Circuits | 1 | - |
| On - State Resistance(Max) | 120Ohm | - |
| Channel - to - Channel Matching(ΔRon) | 6Ohm | - |
| Voltage - Supply, Single (V+) | 4.5V ~ 5.5V | - |
| Voltage - Supply, Dual (V±) | ±1V ~ 5V | - |
| Switch Time(Ton Toff)(Max) | 39ns, 32ns | - |
| -3 dB Bandwidth | 180MHz | - |
| Channel Capacitance(CS(off)CD(off)) | 3.5pF | - |
| Current - Leakage(IS(off))(Max) | 400nA | - |
Frequently asked questions
Are the 74HCT4051D and 74HCT112DB,112 functionally interchangeable?
No. The 74HCT4051D is an 8-channel analog multiplexer/demultiplexer, while the 74HCT112DB,112 is a dual negative-edge-triggered J-K flip-flop with set and reset. They perform entirely different logic and signal-routing functions and cannot be substituted for one another.
What are the primary functions of the 74HCT4051D and 74HCT112DB,112?
The 74HCT4051D is a single 8-channel analog multiplexer/demultiplexer that selects one of eight analog inputs or routes a common signal to one of eight outputs. The 74HCT112DB,112 contains two independent J-K flip-flops that toggle or latch on the negative edge of the clock, with asynchronous set and reset inputs.
Do the 74HCT4051D and 74HCT112DB,112 use the same package type?
No. The 74HCT4051D is supplied in a SO16 (SOIC-16) package, while the 74HCT112DB,112 is supplied in an SSOP-16 (DB) package. The package footprints and land patterns differ, so they are not drop-in replacements on a PCB.
What are the key supply voltage and logic family specifications for both devices?
Both devices belong to the 74HCT logic family and operate with a nominal supply voltage of 5 V, typically within the 4.5 V to 5.5 V range. The 74HCT4051D also supports analog signal switching within its specified analog voltage range, while the 74HCT112DB,112 is a digital logic device with TTL-compatible inputs.
Can the 74HCT4051D and 74HCT112DB,112 be used together in the same design?
Yes, they can coexist in a mixed-signal design because both are 5 V HCT-family devices. The 74HCT4051D can route analog or digital signals, and the 74HCT112DB,112 can provide sequential logic functions, provided each device is used within its own specified operating conditions.
What are the pin count and pinout differences between the 74HCT4051D and 74HCT112DB,112?
Both devices have 16 pins, but their pinouts are completely different. The 74HCT4051D assigns pins to eight analog channels, a common input/output, and three select inputs. The 74HCT112DB,112 assigns pins to two J-K flip-flops with clock, set, reset, J, K, and Q/Qbar outputs. Pin functions are not compatible.
Which device is better suited for analog signal switching and which for sequential logic?
The 74HCT4051D is intended for analog signal switching, multiplexing, and demultiplexing. The 74HCT112DB,112 is intended for sequential digital logic such as counting, toggling, and state storage. Selection depends on whether the application requires signal routing or clocked logic.
Are the 74HCT4051D and 74HCT112DB,112 available in RoHS-compliant versions?
Yes. Both the 74HCT4051D and 74HCT112DB,112 are offered in RoHS-compliant package options by their respective manufacturers. Designers should confirm the specific ordering part number and manufacturer datasheet for the latest compliance status.