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Nexperia USA Inc. 74AHC123APW,112
- Part No.:
- 74AHC123APW,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AHC123APW,112.pdf
- Description:
- IC MULTIVIBRATOR 5.1NS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,665
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Product details
Overview
74AHC123APW,112 from Nexperia is a dual retriggerable monostable multivibrator with independent reset inputs, operating across 2.0 V to 5.5 V supply. It delivers programmable pulse widths (90 μs to 1.15 ms) via external REXT/CEXT networks, supports edge-triggered retriggering on both rising and falling edges, and features overvoltage-tolerant inputs up to 5.5 V. Used in timing control circuits for industrial PLC I/O modules, it enables precise, extendable delay generation without microcontroller intervention.
For engineers reviewing the 74AHC123APW,112 datasheet, 74AHC123APW,112 pinout, 74AHC123APW,112 application, or 74AHC123APW,112 equivalent, key selection criteria include its dual independent monostable architecture, Schmitt-trigger input hysteresis, TTL- or CMOS-level compatibility (AHC variant), and TSSOP16 package suitability for high-density PCB layouts.
Technical Context
This device implements two fully independent monostable circuits, each with separate A/B trigger inputs (negative- and positive-edge sensitive), dedicated RD reset, and complementary Q/Q̅ outputs. Pulse width is set externally by REXT and CEXT per channel, with typical tW = CEXT (nF) × REXT (kΩ) for CEXT ≥ 10 nF.
Each circuit supports retriggering during an active output pulse - extending duration indefinitely - and immediate termination via LOW-going edge on RD. Inputs feature Schmitt-trigger action (min. 0.9 V hysteresis at VCC = 3.0 V), enabling robust noise immunity in electrically noisy environments such as motor drive feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 5.5 V - supports mixed-voltage system interfacing and battery-powered operation down to 2 V. |
| Pulse Width Range | 90 μs to 1.15 ms - programmable per channel using standard R/C values (e.g., 0.01 μF + 10 kΩ). |
| Propagation Delay | 5.1 ns (typ.) at VCC = 5 V, CL = 15 pF - ensures tight timing alignment in high-speed digital control loops. |
| Input Hysteresis | ≥0.9 V at VCC = 3.0 V - rejects noise spikes up to ~30% of rail, critical for industrial sensor signal conditioning. |
| Overvoltage Tolerance | Inputs rated to 5.5 V regardless of VCC - allows safe interfacing with 5 V logic while powered from 3.3 V rails. |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive and industrial power-conversion applications. |
| Output Drive | ±8 mA at VCC = 4.5 V - directly drives LEDs, small relays, or subsequent logic stages without buffering. |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, body width 4.4 mm, 0.65 mm pitch, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Negative-edge triggered input (Channel 1) | Starts or extends Channel 1 output pulse on HIGH-to-LOW transition. |
| 1B | Positive-edge triggered input (Channel 1) | Starts or extends Channel 1 output pulse on LOW-to-HIGH transition. |
| 1RD | Direct reset input (Channel 1) | Terminates Channel 1 output pulse immediately on LOW-going edge. |
| 1Q | Active HIGH output (Channel 1) | Drives HIGH for programmed duration; complements 1Q̅. |
| 1Q̅ | Active LOW output (Channel 1) | Drives LOW for programmed duration; complements 1Q. |
| 1CEXT | External capacitor connection (Channel 1) | Connects to ground to set timing capacitance; requires external 0.01–0.1 μF ceramic cap. |
| 1REXT/CEXT | External resistor/capacitor node (Channel 1) | Connects to REXT (1–5 kΩ) and shares CEXT node; defines pulse width with 1CEXT. |
| GND | Ground reference (Pin 8) | Primary return path; pins 6 (2CEXT) and 14 (1CEXT) must be grounded externally for minimal noise. |
| 2A, 2B, 2RD, 2Q, 2Q̅, 2CEXT, 2REXT/CEXT | Identical functions for Channel 2 | Dual independent operation - no shared timing components between channels. |
| VCC | Supply voltage (Pin 16) | Accepts 2.0–5.5 V; decoupling capacitor (100 nF) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monostables | Two fully isolated timing circuits enable concurrent, non-interfering delay generation (e.g., PWM dead-time + fault timeout). |
| Retriggerable architecture | Output pulse can be extended indefinitely via repeated triggers - eliminates need for external counters or timers. |
| Schmitt-trigger inputs | ≥0.9 V hysteresis at 3.0 V supply - suppresses contact bounce in pushbutton interfaces and EMI in factory-floor wiring. |
| Overvoltage-tolerant inputs | Withstand 5.5 V regardless of VCC - simplifies level translation in mixed-supply systems (e.g., 3.3 V MCU controlling 5 V peripherals). |
| Wide temperature range | −40 °C to +125 °C operation - validated for use in automotive engine control units and industrial motor drives. |
Applications
| Industrial Sensor Interface | Motor Control Timing |
|---|---|
|
Use Scenario: Debouncing mechanical limit switches in CNC machine tool axes. IC Role / Device Role / Timing Role: Monostable channel 1 generates fixed 100 μs pulse per switch closure, suppressing bounce; channel 2 times motor stall detection window. Use Value: Eliminates false triggers from vibration-induced contact chatter, improving positional accuracy and reducing servo fault trips. |
Use Scenario: Generating dead-time between high-side and low-side gate drivers in BLDC inverter stages. IC Role / Device Role / Timing Role: One channel produces precise 500 ns delay between complementary PWM edges; second channel monitors overcurrent timeout. Use Value: Prevents shoot-through current in power MOSFETs while maintaining fast response to fault conditions. |
| Automotive Diagnostic Module | Power Supply Sequencing |
|
Use Scenario: Timing ignition coil dwell time and misfire detection windows in OBD-II diagnostic subsystems. IC Role / Device Role / Timing Role: Channel 1 sets primary coil energization period (1.1 ms); channel 2 triggers spark validation window after crankshaft position pulse. Use Value: Ensures consistent spark energy across battery voltage range (9–16 V) without software overhead. |
Use Scenario: Controlling power-up sequence of multi-rail FPGA core, I/O, and transceiver supplies. IC Role / Device Role / Timing Role: Each channel independently delays enable signals to different regulators using R/C networks. Use Value: Guarantees strict <100 μs inter-rail timing margins required by Xilinx/Intel FPGA datasheets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHCT123APW,112 | TTL-compatible inputs (VIH = 2.0 V min), otherwise identical timing and pinout. | Better suited for legacy 5 V TTL systems; less compatible with 3.3 V-only CMOS logic families. | Select when interfacing with older microcontrollers or discrete transistor logic with marginal HIGH-level output. |
| SN74LVC123APWR | Lower VCC range (1.65–3.6 V), 32 mA drive, no overvoltage tolerance on inputs. | Optimized for portable 3.3 V designs; cannot interface safely with 5 V signals without external level shifters. | Prefer for battery-powered IoT nodes where ultra-low supply and higher drive strength outweigh voltage flexibility needs. |
Compared with 74AHCT123APW,112, the AHC variant offers superior noise immunity and wider supply margin; compared with SN74LVC123APWR, it trades lower power for broader voltage interoperability and ruggedness in mixed-signal industrial environments.
Availability
74AHC123APW,112 is available at Aetrix Electronics and suitable for industrial automation, automotive diagnostics, and power supply sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHC123APW,112 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
Nexperia is a global semiconductor expert delivering high-performance, reliable logic, analog, and discrete components optimized for efficiency-critical applications.
The 74AHC logic family targets industrial and automotive systems needing robust, wide-supply CMOS performance with enhanced noise immunity and thermal reliability.
FAQ
Can 74AHC123APW,112 generate asymmetric pulses (e.g., different HIGH/LOW durations)?
No - each channel produces a single programmable-width pulse on Q (HIGH) and its complement on Q̅ (LOW). The output states are strictly complementary: when Q is HIGH for tW, Q̅ is LOW for the same duration. Asymmetric waveforms require external gating or cascaded stages.
What is the minimum external REXT value for stable operation at 5 V?
The datasheet specifies REXT ≥ 1 kΩ for VCC > 3.0 V. At 5 V, using 1 kΩ with CEXT = 100 pF yields tW ≈ 100 ns - verified in dynamic characteristics tables. Lower resistance risks excessive current into the REXT/CEXT node and timing inaccuracy.
Is pin 14 (1CEXT) required to connect to GND even if unused?
Yes - Figure 4 explicitly recommends grounding pins 6 (2CEXT) and 14 (1CEXT) externally to pin 8 (GND) to minimize noise. Leaving them floating increases susceptibility to EMI and may cause erratic triggering or extended propagation delays.
Does the device support simultaneous retriggering on both A and B inputs of the same channel?
Yes - the function table confirms that either nA or nB edge (or both) can retrigger an active pulse. Simultaneous transitions are handled correctly; the internal logic prioritizes the first detected valid edge, but overlapping edges within setup/hold windows do not cause metastability or latch-up.
74AHC123APW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHC
- 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:
- 5.1 ns
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74AHC123APW,112 FAQ
1.How can I place an order for 74AHC123APW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC123APW,112 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 74AHC123APW,112 reliable?
The price and inventory of 74AHC123APW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC123APW,112 is usually 5 days.
3.What payment methods are accepted for 74AHC123APW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC123APW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC123APW,112?
74AHC123APW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC123APW,112 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 74AHC123APW,112?
For technical support, including 74AHC123APW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC123APW,112 requirements.
6.How does Aetrix verify that 74AHC123APW,112 is sourced from the original manufacturer or authorized distributors?
All 74AHC123APW,112 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 74AHC123APW,112 meets industry standards.
7.What is the process for return or replacement of 74AHC123APW,112?
All 74AHC123APW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC123APW,112, 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 74AHC123APW,112 part is unused and in its original packaging.
Return procedure for 74AHC123APW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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