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

Texas Instruments CD74HCT123M96G4

Name: CD74HCT123M96G4
Brand: Texas Instruments
SKU: CD74HCT123M96G4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD74HCT123M96G4

Manufacturer:: Texas Instruments

Category:: Multivibrators

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: CD74HCT123M96G4.pdf

Description:: IC MULTIVIBRATOR 25NS 16SOIC

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Product details

Overview

CD74HCT123M96G4 from Texas Instruments is a dual retriggerable monostable multivibrator with independent resets, operating at 4.5V–5.5V, featuring Schmitt-trigger inputs on both A and B trigger pins, buffered Q/Q̅ outputs, and external RC timing (t_W = 0.45·R_XC_X). It supports trailing-edge (A) and leading-edge (B) triggering and is used in pulse shaping, debounce, and timing control circuits in industrial control systems.

For engineers reviewing the CD74HCT123M96G4 datasheet, CD74HCT123M96G4 pinout, CD74HCT123M96G4 application, or CD74HCT123M96G4 equivalent, key selection criteria include LSTTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), wide temperature range (–55°C to +125°C), SOIC-16 package compatibility, and retriggerable pulse-width extension capability.

Technical Context

The CD74HCT123M96G4 implements two independent monostable multivibrators, each with separate A/B edge-selectable trigger inputs and dedicated reset (R) terminals. Triggering is enabled by voltage-level detection-not edge rate-via internal Schmitt triggers, ensuring noise immunity against slow or noisy signals.

Each monostable is retriggerable: an active trigger during an ongoing output pulse extends t_W, while a LOW on R terminates it immediately. Timing accuracy depends solely on external R_X (≥5 kΩ min) and C_X (0 pF min), with t_W = 0.45·R_XC_X at V_CC = 5 V, and pulse width match between channels within ±2% under matched RC conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures direct compatibility with standard 5 V LSTTL logic systems without level shifting.
Input Thresholds	V_IL ≤ 0.8 V (max), V_IH ≥ 2.0 V (min) - Guarantees reliable recognition of TTL logic levels across full temperature range.
Output Drive	±4 mA at V_CC = 4.5 V - Sufficient to drive 10 LSTTL loads, enabling direct fanout to legacy logic families.
Propagation Delay	t_PLH/t_PHL ≤ 90 ns (max) at CL = 50 pF - Supports timing-critical applications up to ~10 MHz trigger rates.
Operating Temperature	–55°C to +125°C - Qualified for aerospace, military, and harsh-environment industrial deployments.
Pulse Width Range	Adjustable from nanoseconds to seconds via R_X (5 kΩ–10 MΩ) and C_X (0 pF–100 µF) - Enables flexible timing from debouncing to long-duration event windows.

Pinout & Package

CD74HCT123M96G4 is housed in a 16-pin SOIC (D) package (7.4 mm × 10.4 mm, 1.27 mm pitch), RoHS-compliant with NiPdAu lead finish, MSL Level-1 rating, and tape-and-reel packaging (2500 units/reel).

Pin/Terminal	Circuit Role	Design Meaning
1A, 2A	Trailing-edge trigger input	Activates monostable on negative-to-positive transition; Schmitt-triggered for noise rejection.
1B, 2B	Leading-edge trigger input	Activates monostable on positive-to-negative transition; independent of A input timing.
1R, 2R	Asynchronous reset input	LOW forces Q to LOW and Q̅ to HIGH immediately, overriding active pulse regardless of timing state.
1Q, 2Q	True output	Active-HIGH output pulse with buffered drive; compatible with TTL/CMOS loads.
1Q̅, 2Q̅	Inverted output	Complementary buffered output; enables differential signaling or logic inversion without external gates.
1CX, 2CX	Timing capacitor connection	Connects external C_X; sets pulse width with R_X on pin 15/16; 0 pF minimum allows minimal delay configurations.
1RXCX, 2RXCX	Timing resistor connection	Connects external R_X; forms RC network with C_X to define t_W; ≥5 kΩ ensures stable oscillation.
V_CC, GND	Power supply terminals	Single 4.5–5.5 V rail; decoupling required near pin 16 (V_CC) and pin 8 (GND) for noise-sensitive timing.

Key Features

Feature	Design Value
Retriggerable operation	Enables dynamic pulse extension during active output-critical for variable-duration event capture in sensor interfaces.
Independent A/B edge selection	Eliminates need for external inverters when synchronizing to rising or falling edges of the same signal source.
Overriding reset	Allows hard termination of output pulses for safety-critical interlocks or emergency stop functions in motor controls.
Schmitt-trigger inputs	Provides >1 V hysteresis on A/B/R pins, rejecting EMI-induced glitches in industrial wiring environments.
Wide temperature range	Validated operation from –55°C to +125°C ensures reliability in uncontrolled enclosures or automotive under-hood locations.

Applications

Industrial Debounce Circuit	Serial Data Pulse Shaping
Use Scenario: Mechanical switch inputs in PLC I/O modules generate contact bounce lasting 1–10 ms, causing false interrupts. IC Role / Device Role / Timing Role: CD74HCT123M96G4 acts as a hardware debounce timer, generating a clean, fixed-duration output pulse after first valid edge. Use Value: Eliminates firmware polling or software timers; reduces MCU interrupt load and improves real-time response consistency.	Use Scenario: UART or SPI clock recovery circuits require precise pulse stretching to align data sampling windows. IC Role / Device Role / Timing Role: CD74HCT123M96G4 shapes incoming strobe or sync pulses into uniform-width enable signals for latch control. Use Value: Compensates for jitter in low-cost crystal oscillators; ensures setup/hold margin compliance in synchronous logic blocks.
Motor Start-Up Sequencer	Test Equipment Timing Generator
Use Scenario: Conveyor belt control requires staggered activation of multiple motors to limit inrush current. IC Role / Device Role / Timing Role: CD74HCT123M96G4 provides cascaded, RC-programmable delays between relay driver enable signals. Use Value: Replaces microcontroller-based timing with deterministic, zero-software-failure analog timing.	Use Scenario: Automated test fixtures need repeatable, sub-microsecond trigger pulses for DUT stimulus/response measurement. IC Role / Device Role / Timing Role: CD74HCT123M96G4 generates calibrated, retriggerable pulses synchronized to system clock edges. Use Value: Achieves <±2% pulse width match between channels-enabling accurate skew measurement without calibration overhead.

Industrial Debounce Circuit

Serial Data Pulse Shaping

Use Scenario: Mechanical switch inputs in PLC I/O modules generate contact bounce lasting 1–10 ms, causing false interrupts.

IC Role / Device Role / Timing Role: CD74HCT123M96G4 acts as a hardware debounce timer, generating a clean, fixed-duration output pulse after first valid edge.

Use Value: Eliminates firmware polling or software timers; reduces MCU interrupt load and improves real-time response consistency.

Use Scenario: UART or SPI clock recovery circuits require precise pulse stretching to align data sampling windows.

IC Role / Device Role / Timing Role: CD74HCT123M96G4 shapes incoming strobe or sync pulses into uniform-width enable signals for latch control.

Use Value: Compensates for jitter in low-cost crystal oscillators; ensures setup/hold margin compliance in synchronous logic blocks.

Motor Start-Up Sequencer

Test Equipment Timing Generator

Use Scenario: Conveyor belt control requires staggered activation of multiple motors to limit inrush current.

IC Role / Device Role / Timing Role: CD74HCT123M96G4 provides cascaded, RC-programmable delays between relay driver enable signals.

Use Value: Replaces microcontroller-based timing with deterministic, zero-software-failure analog timing.

Use Scenario: Automated test fixtures need repeatable, sub-microsecond trigger pulses for DUT stimulus/response measurement.

IC Role / Device Role / Timing Role: CD74HCT123M96G4 generates calibrated, retriggerable pulses synchronized to system clock edges.

Use Value: Achieves <±2% pulse width match between channels-enabling accurate skew measurement without calibration overhead.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CD74HC123M96G4	HC variant: 2–6 V supply, CMOS-input compatible (I_IN ≤ 1 µA), higher noise immunity (NIL/NIH = 30%), but not LSTTL-input compatible.	Used where mixed-voltage systems (3.3 V/5 V) exist and LSTTL interfacing is unnecessary.	Select when system uses pure CMOS logic or requires wider V_CC flexibility; avoid if driving directly from 74LSxx outputs.
SN74LV123ADR	LV family: 2–5.5 V operation, lower propagation delay (t_PD ≤ 7.5 ns typ), higher drive (±12 mA), but no Schmitt-trigger inputs and narrower temp range (–40°C to +125°C).	Preferred in high-speed digital systems requiring fast, low-power retriggering without noise-prone signal paths.	Choose for speed-critical designs with clean signal integrity; avoid in electrically noisy environments lacking external filtering.

Compared with CD74HC123M96G4 and SN74LV123ADR, the CD74HCT123M96G4 uniquely balances LSTTL input compatibility, robust Schmitt-trigger noise rejection, and extended temperature support-making it optimal for legacy industrial upgrades and ruggedized embedded timing.

Availability

CD74HCT123M96G4 is available at Aetrix Electronics and suitable for industrial automation, motor control, and test equipment applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HCT123M96G4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The CD74HCT123M96G4 belongs to TI's legacy HCT logic family, designed specifically for seamless integration into 5 V LSTTL-based systems requiring reliable, retriggerable timing with minimal external components.

FAQ

What is the minimum external timing capacitor value supported by the CD74HCT123M96G4?

The CD74HCT123M96G4 supports C_X = 0 pF as the minimum external timing capacitor value. This enables ultra-short pulse widths down to tens of nanoseconds when paired with the minimum R_X of 5 kΩ, verified per datasheet Section 6 switching specifications and absolute maximum ratings.

Can the CD74HCT123M96G4 be triggered by both rising and falling edges simultaneously on the same channel?

No. Each monostable channel (1 or 2) uses either pin 1A (trailing-edge) or pin 1B (leading-edge) for triggering-not both simultaneously. The A and B inputs are functionally exclusive per channel; using both requires external logic to select the desired edge, as confirmed in the truth table and functional description of the CD74HCT123M96G4 datasheet.

Does the CD74HCT123M96G4 require pull-up or pull-down resistors on unused inputs?

Yes. Per datasheet guidance, all unused inputs-including A, B, and R on inactive monostable sections-must be terminated to a defined logic level (V_CC or GND) to prevent floating states that could cause unintended triggering or increased quiescent current. This applies to both channels of the CD74HCT123M96G4 in partial-use configurations.

What is the typical output pulse width accuracy of the CD74HCT123M96G4 over temperature?

The CD74HCT123M96G4 achieves ±2% pulse width match between its two internal monostables when using identical R_X and C_X values, as specified in switching characteristics tables across –55°C to +125°C. Absolute accuracy depends on external component tolerances and temperature coefficients, but relative matching remains stable per device characterization.

Is the CD74HCT123M96G4 pin-compatible with the CD74HC123M96G4?

Yes. The CD74HCT123M96G4 and CD74HC123M96G4 share identical SOIC-16 pinouts, terminal functions, and package dimensions (TI package drawing D). However, they differ in electrical behavior: HCT supports LSTTL inputs, while HC supports CMOS inputs-requiring verification of source logic family compatibility before substitution.

CD74HCT123M96G4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74HCT

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Logic Type:: Monostable

Independent Circuits:: 2

Schmitt Trigger Input:: No

Propagation Delay:: 25 ns

Current - Output High, Low:: 4mA, 4mA

Voltage - Supply:: 4.5 V ~ 5.5 V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

CD74HCT123M96G4 FAQ

1.How can I place an order for CD74HCT123M96G4 through Aetrix?

Please submit a Request for Quotation (RFQ) for CD74HCT123M96G4 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 CD74HCT123M96G4 reliable?

The price and inventory of CD74HCT123M96G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT123M96G4 is usually 5 days.

3.What payment methods are accepted for CD74HCT123M96G4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT123M96G4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD74HCT123M96G4?

CD74HCT123M96G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD74HCT123M96G4 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 CD74HCT123M96G4?

For technical support, including CD74HCT123M96G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT123M96G4 requirements.

6.How does Aetrix verify that CD74HCT123M96G4 is sourced from the original manufacturer or authorized distributors?

All CD74HCT123M96G4 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 CD74HCT123M96G4 meets industry standards.

7.What is the process for return or replacement of CD74HCT123M96G4?

All CD74HCT123M96G4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT123M96G4, 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 CD74HCT123M96G4 part is unused and in its original packaging.

Return procedure for CD74HCT123M96G4:

1.Submit a request within 90 days.

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

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