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Nexperia USA Inc. 74AHCT123APW,112
- Part No.:
- 74AHCT123APW,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AHCT123APW,112.pdf
- Description:
- IC MULTIVIBRATOR 5NS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,850
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Product details
Overview
74AHCT123APW,112 from Nexperia is a dual retriggerable monostable multivibrator with independent reset inputs, TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), 16-pin TSSOP package, and operation across -40 °C to +125 °C. It generates programmable output pulses via external REXT/CEXT networks and supports pulse extension via edge-triggered retriggering on nA/nB or immediate termination via nRD. Used in timing control, debounce, and pulse shaping within industrial PLC I/O modules.
For engineers reviewing the 74AHCT123APW,112 datasheet, 74AHCT123APW,112 pinout, 74AHCT123APW,112 application, or 74AHCT123APW,112 equivalent, key selection criteria include TTL-level input compatibility, retriggerable pulse extension capability, direct asynchronous reset functionality, and guaranteed operation at 4.5–5.5 V supply with 100% duty-cycle support.
Technical Context
This device 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 complementary active-HIGH (nQ) and active-LOW (nQ) outputs. Pulse width tW is externally set by REXT and CEXT, with typical values ranging from 100 ns (CEXT = 28 pF, REXT = 2 kΩ) to 1.15 ms (CEXT = 0.1 μF, REXT = 10 kΩ) at VCC = 4.5–5.5 V.
Each section features Schmitt-trigger inputs for high noise immunity, overvoltage-tolerant inputs up to 5.5 V, and static input leakage ≤ ±2.0 μA over temperature. Propagation delays are specified from nA/nB/nRD to nQ/nQ, with tpd ≤ 17.5 ns (CL = 50 pF, VCC = 4.5–5.5 V), and retrigger time trtrig ≤ 1.5 μs under identical conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with 5 V TTL logic systems and stable operation across industrial temperature range. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches standard TTL voltage levels for seamless interfacing with legacy microcontrollers and logic families. |
| Pulse Width Range | 100 ns to 1.15 ms - Programmable via external REXT (1–5 kΩ) and CEXT (no lower limit), enabling precise timing from high-speed edge detection to slow system control. |
| Propagation Delay | tPD ≤ 17.5 ns (CL = 50 pF) - Supports sub-60 MHz timing resolution in synchronous control loops and digital signal conditioning. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood automotive, motor drive gate control, and industrial automation environments. |
| Output Drive | ±8 mA (VOH/VOL @ VCC = 4.5 V) - Sufficient to directly drive LEDs, small relays, or interface with CMOS/TTL inputs without buffering. |
| Input Leakage | ≤ ±2.0 μA (−40 °C to +125 °C) - Minimizes timing drift and power loss in battery-backed or low-power standby modes. |
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.
| 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; enables edge-sensitive event capture. |
| 1B | Positive-edge triggered input (Channel 1) | Starts or extends Channel 1 output pulse on LOW-to-HIGH transition; supports rising-edge clocked timing. |
| 1RD | Direct reset input (Channel 1) | Terminates Channel 1 output pulse immediately on LOW-going edge; provides hard real-time abort capability. |
| 1Q | Active-HIGH output (Channel 1) | Complementary to 1Q; used where inverted logic is not required-reduces need for external inverters. |
| 1Q | Active-LOW output (Channel 1) | Drives low-side loads or enables active-low enable signals; matches common reset/interrupt conventions. |
| 1CEXT | External capacitor connection (Channel 1) | Connects timing capacitor to ground; must be externally grounded per datasheet recommendation to minimize noise. |
| 1REXT/CEXT | Shared resistor/capacitor node (Channel 1) | Forms RC network with 1CEXT and external REXT to define base pulse width tW = CEXT × REXT (for CEXT ≥ 10 nF). |
| GND | Ground reference (Pin 8) | Primary return path for all internal circuitry and external timing components; critical for stable pulse generation. |
| VCC | Supply voltage (Pin 16) | Power rail for both channels; decoupling capacitor (100 nF) recommended adjacent to Pin 16 for noise suppression. |
| 2A, 2B, 2RD, 2Q, 2Q, 2CEXT, 2REXT/CEXT | Identical functions for Channel 2 | Duplicate set enables independent timing control of two subsystems (e.g., dual-axis motor timing or redundant safety triggers). |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable monostable operation | Enables indefinite pulse extension via repeated nA/nB edges-critical for watchdog timeout stretching or variable-duration strobes. |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V ensures reliable interfacing with legacy 5 V microcontrollers, FPGAs, and discrete logic without level shifters. |
| Asynchronous direct reset (nRD) | Guarantees sub-12 ns pulse termination (tPHL ≤ 12 ns) regardless of current pulse state-essential for fail-safe shutdown paths. |
| Schmitt-trigger inputs | Hysteresis ≥ 0.4 V (typ.) rejects noise on slow-rising signals (e.g., mechanical switch bounce or long PCB traces) without external filtering. |
| Overvoltage-tolerant inputs | Withstands up to 5.5 V regardless of VCC-allows safe interfacing with mixed-voltage domains (e.g., 3.3 V MCU controlling 5 V peripherals). |
Applications
| Industrial Motor Control | Automotive Body Controller |
|---|---|
|
Use Scenario: Generating timed gate-enable pulses for BLDC motor half-bridge drivers during commutation sequencing. IC Role / Device Role / Timing Role: Dual-channel monostable provides synchronized, retriggerable dead-time control and phase-shifted enable signals for upper/lower FETs. Use Value: Eliminates need for microcontroller-based PWM generation in cost-sensitive designs; supports 100% duty cycle for continuous conduction mode. |
Use Scenario: Debouncing door lock/unlock switch inputs and generating fixed-duration actuator drive pulses. IC Role / Device Role / Timing Role: One channel debounces mechanical switch edges using Schmitt inputs; second channel times solenoid activation (e.g., 500 ms lock pulse). Use Value: Reduces MCU GPIO count and firmware complexity; operates reliably across -40 °C to +125 °C under hood conditions. |
| PLC Digital I/O Module | Medical Infusion Pump |
|
Use Scenario: Converting fast, noisy field sensor edges into clean, jitter-free timing windows for status sampling. IC Role / Device Role / Timing Role: Retriggerable monostable stretches short sensor pulses into stable 10–100 μs windows for FPGA capture logic. Use Value: Prevents missed events due to metastability; eliminates external RC+Schmitt circuits, saving board space and BOM cost. |
Use Scenario: Implementing hardware-based safety interlocks that terminate pump motor drive if occlusion detection exceeds 200 ms. IC Role / Device Role / Timing Role: Channel 1 monitors occlusion signal; Channel 2 generates fail-safe shutdown pulse upon timeout or manual abort. Use Value: Provides deterministic, analog-level response time (<15 ns reset propagation) independent of software execution latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHC123APW,112 | CMOS input thresholds (VIH = 3.85 V @ VCC = 5.5 V); wider VCC range (2.0–5.5 V) | Better suited for mixed-voltage systems with 3.3 V controllers driving 5 V loads | Select when interfacing with CMOS logic or requiring ultra-low ICC (<250 μA @ VCC = 3 V) |
| SN74LV123APWR | Lower VCC min (2.0 V), higher speed (tpd ≤ 9.5 ns @ CL = 50 pF), no overvoltage tolerance | Optimized for battery-powered portable devices needing fast, low-voltage timing | Choose for 1.8–5.5 V operation and tighter propagation delay specs; avoid in 5.5 V tolerant interfaces |
Compared with 74AHC123APW,112 and SN74LV123APWR, the 74AHCT123APW,112 uniquely balances TTL compatibility, overvoltage resilience, and industrial temperature support-making it optimal for legacy 5 V systems requiring robust, drop-in timing replacement without redesign.
Availability
74AHCT123APW,112 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, PLC I/O modules, and medical infusion pump safety interlocks requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT123APW,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 MOSFET solutions optimized for efficiency-critical applications in automotive, industrial, and consumer markets.
The 74AHCT series targets TTL-compatible logic replacement in legacy 5 V systems, emphasizing robustness, wide temperature operation, and interoperability with existing digital infrastructure without requiring voltage translation.
FAQ
What is the minimum external capacitor value supported for pulse width programming?
No minimum CEXT value is specified-the device supports CEXT down to 0 pF (i.e., no external capacitor), yielding base pulse widths defined solely by internal delays (~100 ns). For predictable linear scaling (tW ≈ CEXT × REXT), CEXT ≥ 10 nF is recommended per datasheet Section 10.
Can both channels operate independently with different timing components?
Yes. Each channel has dedicated REXT/CEXT nodes (1REXT/CEXT & 1CEXT for Channel 1; 2REXT/CEXT & 2CEXT for Channel 2), allowing fully independent pulse width configuration-e.g., 100 μs for debounce and 2 ms for relay hold-on timing on the same IC.
Is the TSSOP16 package (SOT403-1) RoHS compliant and lead-free?
Yes. The 74AHCT123APW,112 uses a lead-free, RoHS-compliant TSSOP16 package (SOT403-1) with matte tin finish on leads, qualified to JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for unlimited floor life at ≤30 °C/60% RH.
How does the retrigger function interact with an ongoing output pulse?
A retrigger event (nA or nB edge) occurring before the initial pulse expires resets the internal timer and extends the output pulse by the full programmed tW duration-enabling continuous pulse stretching up to 100% duty cycle, as confirmed in Section 1 Function Table and Fig. 6 waveform.
74AHCT123APW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- No
- Propagation Delay:
- 5 ns
- Current - Output High, Low:
- 8mA, 8mA
- 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
74AHCT123APW,112 FAQ
1.How can I place an order for 74AHCT123APW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT123APW,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 74AHCT123APW,112 reliable?
The price and inventory of 74AHCT123APW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT123APW,112 is usually 5 days.
3.What payment methods are accepted for 74AHCT123APW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT123APW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT123APW,112?
74AHCT123APW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT123APW,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 74AHCT123APW,112?
For technical support, including 74AHCT123APW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT123APW,112 requirements.
6.How does Aetrix verify that 74AHCT123APW,112 is sourced from the original manufacturer or authorized distributors?
All 74AHCT123APW,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 74AHCT123APW,112 meets industry standards.
7.What is the process for return or replacement of 74AHCT123APW,112?
All 74AHCT123APW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT123APW,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 74AHCT123APW,112 part is unused and in its original packaging.
Return procedure for 74AHCT123APW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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