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Nexperia USA Inc. 74AHC123APW,118
- Part No.:
- 74AHC123APW,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AHC123APW,118.pdf
- Description:
- IC MULTIVIBRATOR 5.1NS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,459
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Product details
Overview
74AHC123APW,118 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. It is used in timing control circuits for industrial PLC I/O modules requiring precise, extendable delay pulses.
For engineers reviewing the 74AHC123APW,118 datasheet, 74AHC123APW,118 pinout, 74AHC123APW,118 application, or 74AHC123APW,118 equivalent, this device serves as a voltage-flexible, noise-immune timing element where duty-cycle extension, direct reset termination, and mixed-voltage signal translation are required in embedded control systems.
Technical Context
The 74AHC123APW,118 implements two independent monostable circuits, each with dual-edge-triggered inputs (nA: negative-edge, nB: positive-edge), a dedicated reset input (nRD) that terminates output pulses on LOW-going transitions, and Schmitt-trigger inputs for high noise immunity. Pulse width is externally set by REXT and CEXT values per channel, with typical tW = CEXT × REXT (for CEXT ≥ 10 nF).
Each channel provides complementary active-HIGH (nQ) and active-LOW (nQ) outputs. Input levels conform to CMOS thresholds (VIH = 3.85 V @ VCC = 5.5 V; VIL = 1.65 V), and all inputs tolerate up to 5.5 V regardless of VCC - enabling level-shifting between 3.3 V logic domains and 5 V peripherals without external translators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 5.5 V - enables operation across 3.3 V and 5 V systems without level shifters. |
| Pulse Width Range | 90 μs to 1.15 ms - set by external REXT (1–5 kΩ) and CEXT (0.01–0.1 μF); supports flexible timing in control sequencing. |
| Propagation Delay | 5.1 ns (min) to 15.5 ns (max) @ VCC = 4.5–5.5 V, CL = 15 pF - ensures fast response in real-time timing applications. |
| Input Voltage Tolerance | Up to 5.5 V on all inputs - allows safe interfacing with higher-voltage signals in mixed-supply environments. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive and industrial motor control applications. |
| Output Drive | ±8 mA @ VCC = 4.5 V - sufficient to directly drive LEDs, small relays, or logic inputs without buffers. |
| Input Leakage Current | ±0.1 μA (typ) - minimizes timing drift caused by leakage into REXT/CEXT networks. |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-lead, body width 4.4 mm, lead pitch 0.65 mm, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Negative-edge triggered input (Channel 1) | Starts or extends Channel 1 pulse on HIGH-to-LOW transition; enables edge-sensitive event capture. |
| 1B | Positive-edge triggered input (Channel 1) | Starts or extends Channel 1 pulse on LOW-to-HIGH transition; supports dual-edge triggering flexibility. |
| 1RD | Direct reset input (Channel 1) | Terminates Channel 1 output pulse immediately on LOW-going edge - critical for emergency stop or fault recovery. |
| 1Q | Active-HIGH output (Channel 1) | Complementary to 1Q; drives logic-high loads or enables downstream circuitry synchronously with pulse duration. |
| 1Q | Active-LOW output (Channel 1) | Drives pull-down loads (e.g., LED anode, N-channel gate) without inversion; reduces BOM count. |
| 1CEXT | External capacitor connection (Channel 1) | Connects to timing capacitor; must be grounded externally (per Fig. 4) to minimize noise coupling into timing node. |
| 1REXT/CEXT | Shared resistor/capacitor node (Channel 1) | Forms RC network with 1CEXT and external REXT; defines base pulse width per tW ≈ CEXT × REXT. |
| GND | Ground reference (Pin 8) | Common return for all internal logic and timing paths; grounding pins 6 and 14 to this pin suppresses timing jitter. |
| VCC | Supply voltage (Pin 16) | Power rail for both channels; decoupling capacitor (100 nF) recommended within 5 mm of this pin. |
| 2A, 2B, 2RD, 2Q, 2Q, 2CEXT, 2REXT/CEXT | Identical functions for Channel 2 | Duplicate set enables independent timing control for two subsystems (e.g., dual-axis motor enable, redundant safety timers). |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable architecture | Enables indefinite pulse extension via repeated triggers - essential for watchdog timeout stretching or manual override hold functions. |
| Direct asynchronous reset | Guarantees sub-15 ns pulse termination on nRD edge - meets hard real-time requirements in safety-critical interlocks. |
| Overvoltage-tolerant inputs | Accepts 0–5.5 V signals at any VCC (2.0–5.5 V), eliminating level translators in mixed-voltage sensor interfaces. |
| Schmitt-trigger inputs | Hysteresis > 0.5 V improves noise margin on slow-rising signals (e.g., mechanical switch debouncing, thermistor comparators). |
| Wide temperature range | Specified from -40 °C to +125 °C - validated for use in engine control units and industrial inverters without derating. |
Applications
| Industrial Motor Control | Automotive Body Controller |
|---|---|
|
Use Scenario: Generating timed enable pulses for BLDC gate drivers during startup sequence, extended by hall sensor edges. IC Role / Device Role / Timing Role: Dual-channel monostable provides synchronized, retriggerable gate-enable windows for U/V/W phases. Use Value: Eliminates microcontroller timing overhead; pulse extension ensures full commutation cycle completion even with sensor jitter. |
Use Scenario: Debouncing door lock/unlock switch inputs while supporting long-press functions (e.g., window auto-up/down). IC Role / Device Role / Timing Role: Each channel handles one switch: one for edge detection, one for long-press timeout with reset on release. Use Value: Hardware-based timing avoids firmware polling; overvoltage tolerance accepts 12 V switch inputs directly. |
| Programmable Logic Interface | Test Equipment Signal Generation |
|
Use Scenario: Converting FPGA GPIO pulses into precisely shaped, variable-width strobes for legacy parallel bus handshaking. IC Role / Device Role / Timing Role: Acts as programmable pulse stretcher with external R/C tuning to match target bus setup/hold timing. Use Value: Enables FPGA-to-ASIC interoperability without custom RTL; Schmitt inputs reject PCB trace noise. |
Use Scenario: Creating calibrated delay pulses in benchtop function generators for validating oscilloscope trigger latency. IC Role / Device Role / Timing Role: Provides traceable, repeatable pulse widths (90 μs–1.15 ms) using precision R/C components. Use Value: Delivers sub-10 ns propagation delay consistency across temperature - critical for metrology-grade calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHCT123APW,118 | TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V); identical pinout and timing. | Better suited for legacy 5 V TTL systems; less noise margin than AHC version in mixed-signal environments. | Select when interfacing with standard TTL outputs or when VIH < 3.0 V is required. |
| SN74LVC123APWR | Lower VCC range (1.65–3.6 V); no overvoltage tolerance; 3.3 V only operation. | Not suitable for 5 V systems or level translation; lacks reset-asynchronous termination speed (<12 ns). | Choose only for cost-sensitive 3.3 V-only designs where overvoltage tolerance is unnecessary. |
Compared with 74AHCT123APW,118, the AHC variant offers superior noise immunity and wider input voltage tolerance, while SN74LVC123APWR sacrifices robustness for lower voltage operation - making the 74AHC123APW,118 optimal for mixed-supply industrial timing where reliability and flexibility are prioritized.
Availability
74AHC123APW,118 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, programmable logic interface design, and test equipment signal generation requiring stable component supply across extended temperature ranges.
Supply support for 74AHC123APW,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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and discrete devices, with leadership in automotive-qualified components.
The 74AHC logic family targets industrial and automotive applications demanding wide supply range, high noise immunity, and extended temperature operation - designed specifically for robust timing and interface functions in harsh environments.
FAQ
What is the minimum external capacitor value supported for stable pulse width generation?
The datasheet specifies no lower limit for CEXT, but stability requires ≥10 nF for predictable tW ≈ CEXT × REXT behavior. At 28 pF (minimum tested), pulse width drops to 100–200 ns - usable only for ultra-fast gating. For reliable timing above 1 μs, use CEXT ≥ 0.01 μF with REXT ≥ 1 kΩ.
Can 74AHC123APW,118 operate with VCC = 2.5 V while accepting 3.3 V input signals?
Yes. Inputs tolerate up to 5.5 V regardless of VCC, so 3.3 V logic signals are safe at VCC = 2.5 V. However, VIH threshold rises to ~1.75 V (at VCC = 2.5 V), ensuring reliable recognition of 3.3 V HIGH. Output VOH remains ~2.3 V, requiring level matching on driven loads.
How does retriggering affect pulse width accuracy compared to single-shot mode?
Retriggering extends the pulse by the full programmed tW from each new trigger edge - not additive residual time. So if tW = 100 μs and triggers occur every 60 μs, output stays HIGH continuously (100 % duty factor). Accuracy remains ±10 % of nominal tW, unchanged from single-shot mode.
Is the exposed thermal pad on the TSSOP16 package (SOT403-1) required to be soldered?
No. The datasheet states the exposed pad has no electrical or mechanical requirement for soldering. If soldered, it must remain floating or connect to GND - but thermal performance improvement is marginal (<2 °C junction reduction), and mechanical reliability is unaffected when unsoldered.
74AHC123APW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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,118 FAQ
1.How can I place an order for 74AHC123APW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC123APW,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 74AHC123APW,118 reliable?
The price and inventory of 74AHC123APW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC123APW,118 is usually 5 days.
3.What payment methods are accepted for 74AHC123APW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC123APW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC123APW,118?
74AHC123APW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC123APW,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 74AHC123APW,118?
For technical support, including 74AHC123APW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC123APW,118 requirements.
6.How does Aetrix verify that 74AHC123APW,118 is sourced from the original manufacturer or authorized distributors?
All 74AHC123APW,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 74AHC123APW,118 meets industry standards.
7.What is the process for return or replacement of 74AHC123APW,118?
All 74AHC123APW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC123APW,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 74AHC123APW,118 part is unused and in its original packaging.
Return procedure for 74AHC123APW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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