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Home > Products > Integrated Circuits (ICs) > Logic > Multivibrators

Texas Instruments CD74HC123PW

Name: CD74HC123PW
Brand: Texas Instruments
SKU: CD74HC123PW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD74HC123PW

Manufacturer:: Texas Instruments

Category:: Multivibrators

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: CD74HC123PW.pdf

Description:: IC MULTIVIBRATOR 25NS 16TSSOP

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Product details

Overview

CD74HC123PW from Texas Instruments is a dual retriggerable monostable multivibrator with independent resets, operating from 2V to 6V supply, featuring Schmitt-trigger inputs on both A and B trigger pins, buffered Q and Q̅ outputs, and external RC timing (t_W = 0.45·R_XC_X at V_CC = 5V). It supports edge-triggering (A: trailing, B: leading), pulse-width extension via retriggering, and reset-termination of output pulses - used in precision timing control, debounce circuits, and pulse shaping in industrial control systems.

For engineers reviewing the CD74HC123PW datasheet, CD74HC123PW pinout, CD74HC123PW application, or CD74HC123PW equivalent, this page delivers verified timing parameters, TSSOP-16 package details, dual-monostable functional behavior, reset-driven pulse termination, and real-world use cases in signal conditioning and digital timing generation - all grounded in TI's SCHS142F datasheet (Oct 2003).

Technical Context

The CD74HC123PW implements two independent HC-series monostable multivibrators, each with separate A/B edge-selectable triggers and dedicated reset (R) inputs. Its Schmitt-trigger inputs provide noise immunity and consistent threshold switching across temperature (–55°C to +125°C), while retriggerability allows dynamic pulse-width extension without requiring external logic.

Timing is set externally via R_X and C_X, with minimum R_X = 5 kΩ and C_X ≥ 0 pF; propagation delays (e.g., t_PLH = 64 ns max at V_CC = 4.5V, CL = 50 pF) and pulse-width match (±2% between internal monos) are specified over full temperature range - enabling predictable, repeatable one-shot behavior in mixed-signal environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2V to 6V - enables direct interface with 3.3V and 5V logic families without level shifting.
Operating Temperature	–55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial embedded applications.
Output Pulse Width	t_W = 0.45·R_XC_X at V_CC = 5V - provides wide, user-adjustable timing range (e.g., 40–50 µs with R_X = 10 kΩ, C_X = 10 nF).
Propagation Delay	t_PLH/t_PHL ≤ 90 ns max (V_CC = 4.5V, CL = 50 pF) - ensures tight timing margins in high-speed digital control loops.
Input Thresholds	VIH = 3.15V, VIL = 1.35V at V_CC = 4.5V - guarantees robust noise immunity (NIL/NIH = 30% of V_CC).
Pulse Width Match	±2% between Mono 1 and Mono 2 - critical for matched timing in dual-channel synchronization or differential pulse generation.

Pinout & Package

CD74HC123PW is housed in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, 4.4 mm × 5.0 mm body size, and 1.2 mm max height - optimized for high-density PCB layouts and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1A, 2A	Trailing-edge trigger input	Active-low transition initiates or extends output pulse; Schmitt-triggered for noise rejection.
1B, 2B	Leading-edge trigger input	Active-high transition initiates or extends output pulse; independent edge select per monostable.
1R, 2R	Asynchronous reset input	Low-level assertion forces Q = LOW and Q̅ = HIGH, terminating output pulse immediately.
1Q, 2Q	Inverting output	Active-low pulse output; buffered for fanout up to 10 LSTTL loads over full temperature range.
1Q̅, 2Q̅	Non-inverting output	Complementary active-high pulse output; enables direct drive of logic or analog comparators.
1CX, 2CX	External timing capacitor connection	Connects to timing capacitor (C_X); 0 pF minimum enables minimal pulse widths.
1RXCX, 2RXCX	External timing resistor connection	Connects to timing resistor (R_X); ≥5 kΩ minimum ensures stable oscillation and accuracy.
V_CC	Positive supply	2V–6V operation; decoupling required near pin for clean timing performance.
GND	Ground reference	Common return for all signals and power; must be low-impedance for jitter-sensitive timing.

Key Features

Feature	Design Value
Retriggerable monostable operation	Enables dynamic pulse extension during active output - eliminates need for external feedback logic in variable-delay applications.
Independent A/B edge selection per channel	Allows one-shot triggering from either rising or falling edges on same device - reduces component count in mixed-edge signal systems.
Overriding asynchronous reset	Guarantees deterministic pulse termination regardless of trigger state - essential for safety-critical timing abort functions.
Schmitt-trigger inputs with 30% noise margin	Rejects slow-rising or noisy signals without external filtering - improves reliability in motor-control or sensor-interface PCBs.
Wide V_CC range (2V–6V)	Supports direct integration into both 3.3V microcontroller systems and legacy 5V industrial backplanes without voltage translation.

Applications

Industrial Motor Control	Automotive Sensor Debounce
Use Scenario: Generating precise, adjustable gate-drive dead-time pulses in three-phase inverter drivers. IC Role / Device Role / Timing Role: Dual monostable provides matched, independently triggered delay windows for high-side/low-side FET control. Use Value: ±2% pulse-width match ensures consistent dead-time across channels, preventing shoot-through in IGBT/MOSFET bridges.	Use Scenario: Debouncing mechanical switch inputs from vehicle door latch or seat position sensors. IC Role / Device Role / Timing Role: Each monostable filters contact bounce by generating fixed-duration clean pulses after edge detection. Use Value: Schmitt-trigger inputs reject EMI-induced glitches; –55°C to +125°C rating ensures operation in under-dash environments.
Test Equipment Pulse Shaping	Medical Instrument Timing
Use Scenario: Converting irregular TTL-level trigger signals from oscilloscope probes into uniform-width strobe pulses. IC Role / Device Role / Timing Role: Monostable acts as pulse regenerator - standardizes width and edge integrity for downstream sampling logic. Use Value: 64 ns max propagation delay and <19 ns output transition time preserve timing fidelity in sub-100 ns measurement systems.	Use Scenario: Controlling LED flash duration and inter-pulse interval in portable pulse oximeters. IC Role / Device Role / Timing Role: Generates precisely timed, low-jitter LED drive pulses synchronized to photodiode sampling windows. Use Value: External RC programmability allows field calibration of pulse width; 2V min V_CC supports battery-powered operation down to 2.4V.

Industrial Motor Control

Automotive Sensor Debounce

Use Scenario: Generating precise, adjustable gate-drive dead-time pulses in three-phase inverter drivers.

IC Role / Device Role / Timing Role: Dual monostable provides matched, independently triggered delay windows for high-side/low-side FET control.

Use Value: ±2% pulse-width match ensures consistent dead-time across channels, preventing shoot-through in IGBT/MOSFET bridges.

Use Scenario: Debouncing mechanical switch inputs from vehicle door latch or seat position sensors.

IC Role / Device Role / Timing Role: Each monostable filters contact bounce by generating fixed-duration clean pulses after edge detection.

Use Value: Schmitt-trigger inputs reject EMI-induced glitches; –55°C to +125°C rating ensures operation in under-dash environments.

Test Equipment Pulse Shaping

Medical Instrument Timing

Use Scenario: Converting irregular TTL-level trigger signals from oscilloscope probes into uniform-width strobe pulses.

IC Role / Device Role / Timing Role: Monostable acts as pulse regenerator - standardizes width and edge integrity for downstream sampling logic.

Use Value: 64 ns max propagation delay and <19 ns output transition time preserve timing fidelity in sub-100 ns measurement systems.

Use Scenario: Controlling LED flash duration and inter-pulse interval in portable pulse oximeters.

IC Role / Device Role / Timing Role: Generates precisely timed, low-jitter LED drive pulses synchronized to photodiode sampling windows.

Use Value: External RC programmability allows field calibration of pulse width; 2V min V_CC supports battery-powered operation down to 2.4V.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual monostable multivibrator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CD74HC423PW	Lacks retriggerability; reset only terminates pulse - no pulse extension on successive triggers.	Suitable for single-shot, non-retriggerable timing where pulse width must remain fixed regardless of input activity.	Select CD74HC423PW when deterministic, non-extending one-shot behavior is required - e.g., watchdog timeout with fixed period.
SN74LV123APWR	LV-family: 1.65V–5.5V supply, lower drive strength (8 mA), higher input leakage (±1 µA), no Schmitt inputs.	Better suited for ultra-low-voltage battery systems but lacks noise immunity and high-temp capability (–40°C to +125°C only).	Choose SN74LV123APWR for cost-sensitive, low-power consumer devices where Schmitt thresholds and extended temp range are not critical.

Compared with CD74HC423PW and SN74LV123APWR, the CD74HC123PW uniquely combines retriggerability, Schmitt-trigger noise immunity, –55°C to +125°C operation, and 2V–6V flexibility - making it the only option for robust, field-programmable timing in harsh or mixed-voltage environments.

Availability

CD74HC123PW is available at Aetrix Electronics and suitable for industrial motor control, automotive sensor interfaces, test equipment pulse regeneration, and medical instrument timing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC123PW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in high-reliability components.

The CD74HC123PW belongs to TI's 74HC logic family - designed specifically for industrial, aerospace, and automotive applications demanding wide temperature operation, noise-immune timing, and drop-in compatibility with legacy TTL systems.

FAQ

What is the minimum external timing capacitor value supported by the CD74HC123PW?

The CD74HC123PW supports C_X = 0 pF as the minimum external timing capacitor value, enabling minimal pulse widths determined solely by R_X and internal parasitics. This is confirmed in the Absolute Maximum Ratings and Timing section of TI's SCHS142F datasheet (October 2003), where C_X ≥ 0 pF is explicitly stated - allowing ultra-short pulses when paired with low R_X values like 5 kΩ.

Does the CD74HC123PW support both rising- and falling-edge triggering on the same input pin?

No - the CD74HC123PW assigns edge sensitivity per pin: 1A/2A are trailing-edge (falling) sensitive, and 1B/2B are leading-edge (rising) sensitive. This separation is hardwired in silicon and cannot be reconfigured. The datasheet truth table and functional diagram confirm distinct A (↓) and B (↑) trigger paths - ensuring deterministic edge selection without external inverters.

Can the CD74HC123PW operate reliably at 2.0V supply voltage?

Yes - the CD74HC123PW is fully specified for operation at V_CC = 2.0V, with validated DC parameters (VIH = 1.5V, VIL = 0.5V), propagation delays (t_PLH ≤ 450 ns), and fanout (10 LSTTL loads) across –55°C to +125°C. This is documented in the "Operating Conditions" and "DC Electrical Specifications" tables of SCHS142F, confirming true 2V functionality for battery-backed or low-power systems.

Is the CD74HC123PW pin-compatible with the CD74HCT123PW?

No - although both share identical TSSOP-16 packaging and pinout, the CD74HC123PW (HC logic) and CD74HCT123PW (HCT logic) differ electrically: HC operates from 2V–6V with CMOS input thresholds, while HCT requires 4.5V–5.5V and features TTL-compatible inputs (VIH = 2.0V min, VIL = 0.8V max). Interchangeability requires matching supply and input source logic families.

What is the maximum recommended external timing resistor value for the CD74HC123PW?

The datasheet does not specify an absolute maximum R_X, but practical limits arise from leakage current and timing accuracy. At V_CC = 5V, input leakage ≤ ±1 µA introduces error >1% when R_X exceeds ~10 MΩ (per t_W = 0.45·R_XC_X). TI application notes and characterization curves show stable operation up to 1 MΩ with standard capacitors - beyond which pulse width deviation increases significantly.

CD74HC123PW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74HC

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Monostable

Independent Circuits:: 2

Schmitt Trigger Input:: No

Propagation Delay:: 25 ns

Current - Output High, Low:: 5.2mA, 5.2mA

Voltage - Supply:: 2 V ~ 6 V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

CD74HC123PW FAQ

1.How can I place an order for CD74HC123PW through Aetrix?

Please submit a Request for Quotation (RFQ) for CD74HC123PW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CD74HC123PW reliable?

The price and inventory of CD74HC123PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC123PW is usually 5 days.

3.What payment methods are accepted for CD74HC123PW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC123PW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD74HC123PW?

CD74HC123PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD74HC123PW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CD74HC123PW?

For technical support, including CD74HC123PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC123PW requirements.

6.How does Aetrix verify that CD74HC123PW is sourced from the original manufacturer or authorized distributors?

All CD74HC123PW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD74HC123PW meets industry standards.

7.What is the process for return or replacement of CD74HC123PW?

All CD74HC123PW units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC123PW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CD74HC123PW part is unused and in its original packaging.

Return procedure for CD74HC123PW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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