CD74HC123EG4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments CD74HC123EG4 is a dual retriggerable monostable multivibrator in a 16-pin DIP package, operating from 2V to 6V supply. Key specs: independent A/B trigger inputs, active-low CLR pin, propagation delay ~23 ns at 5V. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD74HC123EG4 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74HC123EG4?
- Dual independent retriggerable monostable multivibrators allowing two separate pulse-width circuits in a single 16-pin DIP package
- Wide supply voltage range of 2V to 6V with CMOS-compatible inputs enabling direct interfacing to 3.3V and 5V logic without level shifters
- Active-low asynchronous CLEAR input on each section allows immediate output reset independent of trigger state, improving fault-handling in timing circuits
- Schmitt-trigger action on A inputs provides noise immunity of up to 1.2V at 5V supply, ensuring reliable triggering in electrically noisy industrial environments
What is CD74HC123EG4 used for?
The CD74HC123EG4 is commonly used in digital timing and pulse-stretching applications where a clean, fixed-width output pulse must be generated from a noisy or bounce-prone input signal. Its dual-channel design makes it ideal for debouncing mechanical switches, generating clock enable pulses, and creating time delays in microcontroller-based systems operating on 3.3V or 5V rails. Industrial automation, consumer electronics, and communication interface boards also use it for one-shot pulse generation to drive LEDs, relays, or gate signals.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the CD74HC123EG4 datasheet?
CD74HC123EG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HC123EG4?
Compatible alternatives and drop-in replacements for CD74HC123EG4:
Frequently Asked Questions
What supply voltage range does the CD74HC123EG4 support and how does that affect system compatibility?
The CD74HC123EG4 operates from 2V to 6V, covering both 3.3V and 5V logic families without level-shifting circuitry. At 5V the propagation delay is approximately 23 ns, and at 3.3V it increases slightly to around 35 ns, so designers should verify timing margins when clocking the downstream logic at frequencies above 10 MHz.
How does the retriggerable behavior of the CD74HC123EG4 differ from a non-retriggerable one-shot in a switch-debounce application?
Because the CD74HC123EG4 is retriggerable, each new trigger edge restarts the output pulse timer, extending the output HIGH duration as long as input pulses continue to arrive within the programmed RC time constant. In a 5V switch-debounce circuit using a 10 kΩ resistor and 100 nF capacitor, the output pulse width is approximately 0.7 ms, and repeated bounces simply retrigger the 0.7 ms window rather than producing multiple output pulses.
What is the output pulse-width formula for the CD74HC123EG4 and what component values produce a 1 ms delay?
The output pulse width is defined as t_W ≈ 0.28 × R × C × (1 + 0.7/Vcc). For a 1 ms pulse at 5V, a 33 kΩ resistor paired with a 100 nF capacitor gives approximately 0.28 × 33000 × 0.0000001 × 1.14 ≈ 1.05 ms, which is within 5% of the target. The timing resistor must be between 5 kΩ and 100 kΩ, and the capacitor should be a stable ceramic type for best accuracy.
When should the CD74HC123EG4 in a 16-pin DIP package be chosen over an SMD alternative for a new PCB design?
The 16-pin DIP package is best suited for prototyping boards, through-hole rework scenarios, or low-volume industrial designs where hand-soldering is preferred. For high-density or reflow-soldered production boards, the CD74HC123M (SOIC-16) or CD74HC123PWR (TSSOP-16) variants save roughly 60% board area while offering identical electrical performance across the same 2V to 6V supply range.
What happens to the CD74HC123EG4 output when the active-low CLR pin is asserted during an active pulse?
Asserting CLR LOW immediately forces the Q output LOW and Q-bar HIGH regardless of the current RC timing cycle, with a propagation delay of less than 30 ns at 5V. This asynchronous reset behavior allows the host microcontroller to abort a pulse mid-cycle, which is critical in safety-oriented designs that need to suppress gate or relay-drive signals within a single clock cycle of a fault condition.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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