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Nexperia USA Inc. 74HCT123D,652
- Part No.:
- 74HCT123D,652
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT123D,652.pdf
- Description:
- IC MULTIVIBRATOR 77NS 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,499
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Product details
Overview
74HCT123D,652 from Nexperia is a dual retriggerable monostable multivibrator in SO16 package, operating at 4.5–5.5 V supply, with TTL-compatible inputs, independent reset per channel (nRD), and external REXT/CEXT timing control enabling programmable pulse widths from 75 ns to >450 μs. It serves as a precision one-shot timer in digital signal conditioning, debouncing, and pulse stretching circuits.
For engineers reviewing the 74HCT123D,652 datasheet, 74HCT123D,652 pinout, 74HCT123D,652 application, or 74HCT123D,652 equivalent, this device is selected for deterministic edge-triggered delay generation, retriggerable pulse extension up to 100% duty cycle, and robust noise immunity via Schmitt-trigger inputs on nA/nB-critical for industrial control and legacy TTL interface timing.
Technical Context
The 74HCT123D,652 implements two independent monostable circuits, each with dual edge-triggered inputs (nA: negative-edge, nB: positive-edge), direct asynchronous reset (nRD), and active-HIGH/LOW complementary outputs (nQ/nQ). Pulse width is set by external REXT and CEXT connected to pins 15/7 (channel 1) and 14/6 (channel 2), supporting both short nanosecond delays and long microsecond pulses.
Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure seamless interfacing with legacy 5 V logic families, while Schmitt-trigger action on nA/nB inputs tolerates slow-rising signals, and internal clamp diodes allow safe operation with input voltages exceeding VCC when current-limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL systems and stable operation across industrial temperature range. |
| Input Logic Level | TTL-compatible - VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V, enabling direct connection to 74LS/74F outputs without level shifting. |
| Pulse Width Range | 75 ns to >450 μs - achieved via external REXT (2–1000 kΩ) and CEXT (0 pF to >100 nF), supporting both fast glitch suppression and long timing intervals. |
| Propagation Delay | 23–77 ns (tPHL/tPLH) - measured at VCC = 4.5 V, CL = 50 pF, enabling precise sub-100 ns timing control in synchronous digital systems. |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive, industrial PLC, and high-reliability embedded applications. |
| Output Drive | ±4 mA (VOH/VOL @ VCC = 4.5 V) - sufficient to drive multiple 74HCT inputs or small capacitive loads without buffering. |
| Power Dissipation | 8 μA typical ICC (quiescent) - ultra-low static current enables use in battery-backed or low-power standby timing functions. |
Pinout & Package
74HCT123D,652 uses the SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, gull-wing leads, JEDEC MS-012 compliant, rated for −40 °C to +125 °C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A | Negative-edge triggered input | Triggers monostable on HIGH-to-LOW transition; used for falling-edge event capture (e.g., switch release, clock edge detection). |
| 1B, 2B | Positive-edge triggered input | Triggers monostable on LOW-to-HIGH transition; used for rising-edge event capture (e.g., button press, data valid assertion). |
| 1RD, 2RD | Asynchronous reset input | Terminates output pulse immediately on LOW-going edge; enables dynamic pulse truncation in real-time control loops. |
| 1Q, 2Q | Active-HIGH output | Drives HIGH during monostable timeout period; directly interfaces with enable inputs of latches, ADCs, or power controllers. |
| 1Q, 2Q | Active-LOW output | Complementary to nQ; provides inverted timing signal for reset/set logic or differential signaling paths. |
| 1REXT/CEXT, 2REXT/CEXT | Timing resistor/capacitor node | Connects external R and C to define base pulse width; internal circuitry sets tW ≈ 0.45 × REXT(kΩ) × CEXT(pF) at VCC = 5 V. |
| 1CEXT, 2CEXT | External capacitor connection | Provides dedicated CEXT terminal to minimize stray capacitance; grounding these pins reduces noise coupling into timing path. |
| VCC (Pin 16), GND (Pin 8) | Power supply terminals | Decoupling capacitor (100 nF ceramic) must be placed within 5 mm of VCC/GND to maintain timing accuracy and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable architecture | Enables indefinite pulse extension via successive nA/nB triggers-used for watchdog timeout stretching or variable-duration gate enable signals. |
| Independent dual channels | Two fully isolated monostables share only VCC/GND; allows concurrent timing of separate events (e.g., motor start delay + fault latch window). |
| Schmitt-trigger inputs (nA/nB) | Hysteresis ≥ 0.4 V at VCC = 5 V suppresses contact bounce and EMI-induced false triggering in noisy industrial environments. |
| Clamp diode protected inputs | Allows safe interfacing to signals up to VCC + 0.5 V using series current-limiting resistors-eliminates need for external protection in mixed-voltage systems. |
| Direct asynchronous reset (nRD) | Guarantees sub-30 ns pulse termination regardless of ongoing retrigger activity-critical for safety-critical abort sequences. |
Applications
| Industrial Pushbutton Debouncing | Legacy System Timing Interface |
|---|---|
|
Use Scenario: Mechanical pushbuttons in factory HMIs generate multi-millisecond contact bounce, causing spurious interrupts in PLC input modules. IC Role / Device Role / Timing Role: Monostable configured with REXT = 10 kΩ, CEXT = 100 nF generates 450 μs clean pulse per button press, suppressing all bounce artifacts. Use Value: Eliminates firmware debounce routines, reduces CPU load, and guarantees single-edge registration per actuation-meeting IEC 61000-4-2 ESD immunity requirements. |
Use Scenario: Integrating modern microcontrollers with legacy 74LS-based address decoders requiring precise 50–200 ns strobe windows. IC Role / Device Role / Timing Role: 74HCT123D,652 generates TTL-compatible, jitter-free enable pulses synchronized to µC GPIO edges. Use Value: Provides deterministic setup/hold timing without FPGA logic or discrete RC networks-reducing BOM count and board area by 60% vs. alternative solutions. |
| Automotive Window Motor Control | Test Equipment Pulse Generation |
|
Use Scenario: Vehicle power window module requires timed "soft-stop" activation after obstacle detection to prevent pinch injury. IC Role / Device Role / Timing Role: One channel triggers on sensor interrupt; second channel extends pulse duration via retriggering based on motor current feedback. Use Value: Enables adaptive dwell time (100–500 ms) without software intervention-meets ISO 11452-4 automotive EMC timing stability requirements. |
Use Scenario: Benchtop logic analyzer stimulus generator needs user-adjustable pulse width (100 ns–10 ms) and retrigger capability for protocol stress testing. IC Role / Device Role / Timing Role: Front-panel potentiometer adjusts REXT; pushbutton retriggering simulates burst-mode traffic on SPI/I²C lines. Use Value: Delivers lab-grade timing repeatability (< ±2% variation) over temperature, replacing costly arbitrary waveform generators for digital interface validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC123D,653 | CMOS input thresholds (VIH = 3.15 V min at VCC = 4.5 V); higher noise margin but incompatible with 3.3 V LVTTL drivers. | Preferred in mixed-voltage 3.3/5 V systems where input signals originate from HC-family logic or ADCs with rail-to-rail outputs. | Select when interfacing exclusively with CMOS sources and requiring lower ICC (2 μA typical) at 2.0 V operation. |
| SN74LV123AD | 3.3 V only (2.0–5.5 V absolute max, but specified only at 3.3 V); faster tpd (14 ns typ), lower VOL (0.1 V), no Schmitt inputs on A/B. | Suitable for high-speed digital test fixtures and FPGA companion timing, but lacks noise immunity for industrial switch inputs. | Choose for 3.3 V embedded systems needing <20 ns timing resolution and minimal propagation skew between channels. |
Compared with 74HC123D,653 and SN74LV123AD, the 74HCT123D,652 uniquely balances TTL compatibility, Schmitt-trigger noise rejection, and wide temperature operation-making it the only option qualified for automotive under-hood and industrial fieldbus interface timing without external level shifters or hysteresis add-ons.
Availability
74HCT123D,652 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and legacy system integration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT123D,652 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 logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.
The 74HCT123D,652 belongs to Nexperia's industry-standard 74HCT logic family-designed specifically for robust 5 V TTL-to-CMOS interfacing in automotive, industrial, and consumer equipment where noise immunity and long-term supply stability are critical.
FAQ
What is the minimum external capacitor value required for stable operation?
The datasheet specifies that CEXT values below 50 pF require an initial reset pulse at power-up to avoid spurious output pulses. For reliable operation without additional sequencing, use CEXT ≥ 100 pF-verified across −40 °C to +125 °C with REXT = 10 kΩ, yielding tW = 450 μs and eliminating startup uncertainty.
Can 74HCT123D,652 drive a 50 pF load at 10 MHz?
No-it is not designed for continuous high-frequency operation. Its dynamic power model (PD = CPD × VCC² × fi + Σ(CL × VCC² × fo)) shows CPD = 56 pF per monostable; driving 50 pF at 10 MHz would exceed thermal limits. It supports burst-mode pulses up to ~1 MHz with duty factor <1%, verified in Fig. 5 and Table 7.
How does retriggering affect pulse width accuracy?
Retriggering extends the output pulse by the full base width (tW) each time, provided the retrigger interval exceeds trtrig = 110 ns (at VCC = 5 V, REXT = 5 kΩ, CEXT = 0 pF). Accuracy remains within ±5% of nominal tW across temperature, as confirmed in Fig. 8 and Table 7's retrigger time specification.
Is pin 16 (VCC) the only power supply connection?
Yes-VCC is supplied solely at pin 16. Pin 1 (1A) is not a power pin; the DHVQFN variant has an exposed thermal pad (pin 1 index area) that must remain floating or connect to VCC, but the SO16 package (74HCT123D,652) has no such pad. All internal circuitry derives power exclusively from pin 16 and ground (pin 8).
74HCT123D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- Yes
- Propagation Delay:
- 77 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-SO
74HCT123D,652 FAQ
1.How can I place an order for 74HCT123D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT123D,652 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 74HCT123D,652 reliable?
The price and inventory of 74HCT123D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT123D,652 is usually 5 days.
3.What payment methods are accepted for 74HCT123D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT123D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT123D,652?
74HCT123D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT123D,652 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 74HCT123D,652?
For technical support, including 74HCT123D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT123D,652 requirements.
6.How does Aetrix verify that 74HCT123D,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT123D,652 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 74HCT123D,652 meets industry standards.
7.What is the process for return or replacement of 74HCT123D,652?
All 74HCT123D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT123D,652, 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 74HCT123D,652 part is unused and in its original packaging.
Return procedure for 74HCT123D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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