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NXP Semiconductors 74HCT423PW,118
- Part No.:
- 74HCT423PW,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Multivibrators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT423PW,118.pdf
- Description:
- IC MULTIVIBRATOR 22NS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,610
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Product details
Overview
74HCT423PW,118 from NXP Semiconductors is a dual retriggerable monostable multivibrator with independent reset inputs, designed for precise pulse generation and extension in TTL-compatible digital systems. It features Schmitt-trigger inputs on nA/nB, operates from 4.5 V to 5.5 V, supports −40 °C to +125 °C ambient range, delivers sub-30 ns propagation delay at 5 V, and enables programmable output pulse widths up to hundreds of microseconds via external REXT/CEXT networks - used in timing control, debounce, and event stretching circuits.
For engineers reviewing the 74HCT423PW,118 datasheet, 74HCT423PW,118 pinout, 74HCT423PW,118 application, or 74HCT423PW,118 equivalent, this page provides verified functional context, TSSOP16 package details, real-world timing behavior, reset-controlled pulse termination, and validated alternatives for industrial control, automotive subsystems, and legacy TTL interface bridging.
Technical Context
The 74HCT423PW,118 implements two independent monostable circuits, each with dual-edge trigger capability (nA: negative edge, nB: positive edge), direct active-LOW reset (nRD), and retriggerable operation that extends output pulse duration without requiring external logic. Its Schmitt-trigger inputs tolerate slow-rising/falling signals, eliminating need for external conditioning.
Timing is set by external REXT and CEXT components connected to pins 7/15 (nREXT/CEXT) and 6/14 (nCEXT); minimum pulse width follows tW = 0.45 × REXT(kΩ) × CEXT(nF) (typ.) at VCC = 5 V. Reset overrides triggering and forces complementary outputs to defined states (nQ = LOW, nQ = HIGH).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL logic rails and stable operation across industrial voltage tolerances. |
| Propagation Delay | 22 ns (max, 25 °C) from nA/nB to nQ/nQ - enables reliable timing in high-speed digital control loops with ≤45 MHz effective timing resolution. |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive, industrial motor drives, and extended-temperature embedded applications. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V (VCC = 4.5–5.5 V) - guarantees robust noise immunity and clean interfacing with 5 V CMOS/TTL sources. |
| Output Drive | ±4 mA at VOL ≤ 0.4 V / VOH ≥ 3.7 V - sufficient to directly drive LED indicators, small logic loads, or buffer inputs without external amplification. |
| ESD Protection | HBM > 2000 V, MM > 200 V - meets IEC 61000-4-2 Level 2 requirements for handling and board-level reliability in manufacturing environments. |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-lead, body width 4.4 mm, 0.65 mm pitch, exposed pad not electrically connected - optimized for high-density PCB layouts and automated SMT assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | nA (trigger A) | Negative-edge triggered input with Schmitt action; initiates or extends output pulse on falling transition. |
| 2, 10 | nB (trigger B) | Positive-edge triggered input with Schmitt action; initiates or extends output pulse on rising transition. |
| 3, 11 | nRD (reset) | Active-LOW asynchronous reset; forces nQ = LOW / nQ = HIGH and blocks further triggering until released. |
| 4, 12 | nQ (output Q) | Active-LOW complement output; sinks current when asserted; synchronized with monostable timing state. |
| 5, 13 | nQ (output Q) | Active-HIGH true output; sources current when asserted; provides inverted logic level of nQ. |
| 6, 14 | nCEXT | External capacitor connection point for timing network; tied to GND externally per layout best practice. |
| 7, 15 | nREXT/CEXT | Shared node for external resistor and capacitor; defines base pulse width and retrigger sensitivity. |
| 8 | GND | Ground reference (0 V) for all internal circuitry and I/O; must be low-impedance connection. |
| 16 | VCC | Positive supply rail (4.5–5.5 V); requires local 100 nF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monostables | Two fully isolated timing channels share only VCC/GND - eliminates crosstalk and enables parallel pulse generation. |
| Retriggerable operation | Each channel extends its output pulse on successive nA/nB edges - supports indefinite pulse stretching up to 100 % duty cycle. |
| Direct asynchronous reset | nRD terminates ongoing pulses immediately and holds outputs in known state - critical for safety-critical timeout recovery. |
| Schmitt-trigger inputs | nA/nB inputs reject noise and accept slow edges (≥139 ns/V at 4.5 V) - eliminates need for external RC filters or buffers. |
| JEDEC Std. 7A compliance | Pin-compatible with LSTTL logic families - enables drop-in replacement in legacy 74LS123-based designs without redesign. |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
Use Scenario: Debouncing mechanical relay contacts and limit switches in PLC I/O modules. IC Role / Device Role / Timing Role: Monostable acts as hardware-based contact bounce filter with adjustable hold time (10 µs–100 ms). Use Value: Eliminates firmware polling overhead and prevents false edge detection in noisy factory environments. |
Use Scenario: Generating timed window signals for door lock actuator enable/disable sequencing. IC Role / Device Role / Timing Role: Provides precise, reset-controllable pulse to gate power MOSFET drivers during lock/unlock cycles. Use Value: Ensures consistent 250 ms actuation window regardless of microcontroller load or voltage sag. |
| Legacy System Interface | Test & Measurement Equipment |
Use Scenario: Bridging 5 V TTL logic levels between vintage test gear and modern FPGA controllers. IC Role / Device Role / Timing Role: Generates standardized strobe pulses compatible with 74LS123 timing protocols. Use Value: Maintains signal integrity and timing accuracy without level-shifter complexity or software latency. |
Use Scenario: Creating calibrated delay windows for signal path validation in benchtop oscilloscope trigger subsystems. IC Role / Device Role / Timing Role: Delivers repeatable, temperature-stable pulse widths (±5 % over −40 °C to +125 °C). Use Value: Enables traceable, hardware-based timing calibration independent of microcontroller clock drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT123PW,118 | Non-retriggerable; single-shot only; identical pinout, supply, and temperature specs. | Cannot extend output pulse - suitable only for fixed-duration timing, not event stretching. | Select when deterministic one-shot behavior is required and retriggering introduces risk of unintended pulse extension. |
| SN74LV123APWR | Lower VCC range (2–5.5 V); LV logic thresholds; 3.3 V native; no HCT-level TTL compatibility. | Requires level translation when interfacing with 5 V TTL; unsuitable for direct 74LS123 replacement. | Prefer for new 3.3 V designs where power efficiency and mixed-voltage interoperability outweigh legacy compatibility needs. |
Compared with 74HCT423PW,118, the 74HCT123PW,118 offers simpler fixed-pulse timing but lacks retriggering flexibility, while SN74LV123APWR enables lower-voltage operation at the cost of 5 V TTL interface support - making 74HCT423PW,118 the only choice for robust, extensible pulse generation in legacy-compliant 5 V systems.
Availability
74HCT423PW,118 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and legacy system interface applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 74HCT423PW,118 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in logic, interface, and timing ICs.
The 74HCT423PW,118 belongs to NXP's 74HCT logic family, engineered specifically to provide TTL-compatible performance in CMOS technology - enabling seamless integration into legacy 5 V systems while delivering improved noise immunity and lower power consumption.
FAQ
What is the minimum external timing capacitor value supported by the 74HCT423PW,118?
The 74HCT423PW,118 does not specify a minimum CEXT value; however, for stable operation with REXT = 2 kΩ to 1000 kΩ, CEXT ≥ 10 pF is recommended to avoid timing inaccuracies due to inherent pin capacitance (7 pF). At CEXT < 10 pF, pulse width becomes highly sensitive to parasitic effects - use 100 pF or higher for production designs.
Can the 74HCT423PW,118 operate reliably at 4.5 V supply voltage?
Yes, the 74HCT423PW,118 is fully specified from 4.5 V to 5.5 V. At VCC = 4.5 V, it guarantees VIH ≥ 2.0 V, VIL ≤ 0.8 V, tPD ≤ 77 ns, and VOH ≥ 3.84 V at 4 mA sink - meeting all timing and logic threshold requirements for industrial 5 V systems with nominal rail tolerance.
How does the reset function behave during an active output pulse in the 74HCT423PW,118?
When nRD is driven LOW during an active output pulse, the 74HCT423PW,118 immediately forces nQ = LOW and nQ = HIGH, terminating the pulse regardless of REXT/CEXT values or ongoing retrigger events. The internal monostable state is cleared, and triggering remains inhibited until nRD returns HIGH.
Is the 74HCT423PW,118 pin-compatible with the 74LS123?
Yes, the 74HCT423PW,118 is pin-compatible with the 74LS123 per JEDEC Standard No. 7A. All 16 pins match functionally and physically, including identical nA/nB/nRD/nQ/nQ assignments and TSSOP16 footprint compatibility - enabling direct replacement without PCB modification.
What is the maximum recommended value for the external timing resistor REXT in the 74HCT423PW,118?
The 74HCT423PW,118 specifies REXT up to 1000 kΩ at VCC = 5.0 V. Beyond this, leakage currents and noise susceptibility degrade timing accuracy and pulse width stability. For reliable operation across −40 °C to +125 °C, keep REXT ≤ 680 kΩ and pair with CEXT ≥ 100 pF to maintain ±10 % pulse width tolerance.
74HCT423PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- No
- Propagation Delay:
- 22 ns
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74HCT423PW,118 FAQ
1.How can I place an order for 74HCT423PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT423PW,118 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 74HCT423PW,118 reliable?
The price and inventory of 74HCT423PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT423PW,118 is usually 5 days.
3.What payment methods are accepted for 74HCT423PW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT423PW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT423PW,118?
74HCT423PW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT423PW,118 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 74HCT423PW,118?
For technical support, including 74HCT423PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT423PW,118 requirements.
6.How does Aetrix verify that 74HCT423PW,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT423PW,118 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 74HCT423PW,118 meets industry standards.
7.What is the process for return or replacement of 74HCT423PW,118?
All 74HCT423PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT423PW,118, 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 74HCT423PW,118 part is unused and in its original packaging.
Return procedure for 74HCT423PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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