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Nexperia USA Inc. 74HC123BQ,115
- Part No.:
- 74HC123BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
74HC123BQ,115.pdf
- Description:
- IC MULTIVIBRATOR 65NS 16DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,316
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Product details
Overview
74HC123BQ,115 from Nexperia is a dual retriggerable monostable multivibrator with independent reset inputs, operating across 2.0 V to 6.0 V supply. It generates programmable output pulses via external REXT/CEXT networks (e.g., 75 ns min pulse width at 5 V, 5 kΩ/0 pF), supports edge-triggered retriggering on nA/nB inputs, and terminates pulses early via LOW-going nRD. Used in timing control, debounce circuits, and pulse stretching in industrial I/O modules.
For engineers reviewing the 74HC123BQ,115 datasheet, 74HC123BQ,115 pinout, 74HC123BQ,115 application, or 74HC123BQ,115 equivalent, this device delivers precise, extendable timing windows with Schmitt-trigger input tolerance, CMOS-level compatibility, and thermal-enhanced DHVQFN16 packaging for high-density PCB layouts.
Technical Context
The 74HC123BQ,115 implements two independent monostable circuits, each with separate negative-edge (nA) and positive-edge (nB) trigger inputs, active-LOW direct reset (nRD), and complementary outputs (nQ/nQ). Pulse width is set by external REXT and CEXT components per channel, with retriggering enabled during active output to extend duration indefinitely - supporting up to 100 % duty factor operation.
Schmitt-trigger action on nA/nB inputs ensures robustness against slow-rising/falling signals; clamp diodes allow interfacing to voltages exceeding VCC using current-limiting resistors. The device complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), and operates from –40 °C to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - enables interoperability with 3.3 V and 5 V logic systems without level shifters. |
| Propagation Delay (tpd) | 24 ns typical at VCC = 6.0 V - ensures fast response in real-time timing applications like encoder signal conditioning. |
| Pulse Width (tW) | 75 ns minimum (REXT = 5 kΩ, CEXT = 0 pF) - supports sub-100 ns timing resolution for high-speed event capture. |
| Retrigger Time (trtrig) | 110 ns typical at VCC = 5.0 V - defines shortest interval between valid retrigger pulses to sustain extended output. |
| Input Thresholds (VIH/VIL) | VIH = 4.2 V, VIL = 1.8 V at VCC = 6.0 V - provides 1.2 V noise margin for reliable CMOS-level switching. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive, motor drive control, and industrial PLC environments. |
| Power Dissipation (Ptot) | 500 mW max (derates 11.2 mW/K above 106 °C) - supports sustained operation in thermally constrained embedded enclosures. |
Pinout & Package
DHVQFN16 package (SOT763-1): 2.5 × 3.5 × 0.85 mm body, 16-terminal no-lead quad flat design with exposed thermal pad (non-soldered or floating); optimized for thermal performance and space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary power supply pin (not electrically required to be soldered; pad may float or connect to VCC). |
| 2 | 2REXT/CEXT | Combined resistor/capacitor connection for channel 2 timing network - sets base pulse width and retrigger behavior. |
| 3 | 2B | Positive-edge triggered input for channel 2 - initiates or extends output pulse on rising edge. |
| 4 | 2CEXT | Capacitor connection for channel 2 - used with 2REXT/CEXT to define timing constants; recommended grounded externally. |
| 5 | 2RD | Direct reset input for channel 2 - terminates active output pulse on LOW-going edge. |
| 6 | 2Q | Active-LOW output for channel 2 - complements 2Q; drives logic LOW during monostable period. |
| 7 | 2Q | Active-HIGH output for channel 2 - complements 2Q; drives logic HIGH during monostable period. |
| 8 | 1Q | Active-HIGH output for channel 1 - complements 1Q; synchronized with 1A/1B triggers and 1RD reset. |
| 9 | 1Q | Active-LOW output for channel 1 - complements 1Q; used for inverted timing control in synchronous logic. |
| 10 | 1RD | Direct reset input for channel 1 - terminates active output pulse on LOW-going edge. |
| 11 | 1CEXT | Capacitor connection for channel 1 - used with 1REXT/CEXT; recommended grounded externally to reduce noise. |
| 12 | 1B | Positive-edge triggered input for channel 1 - initiates or extends output pulse on rising edge. |
| 13 | 1REXT/CEXT | Combined resistor/capacitor connection for channel 1 timing network - primary timing node for pulse generation. |
| 14 | GND | Ground reference (0 V) - must be connected to system ground plane for stable operation and ESD protection. |
| 15 | 2A | Negative-edge triggered input for channel 2 - initiates or extends output pulse on falling edge. |
| 16 | 1A | Negative-edge triggered input for channel 1 - initiates or extends output pulse on falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable monostable architecture | Enables indefinite pulse extension via successive nA/nB edges - eliminates need for external counters or microcontrollers in long-delay applications. |
| Schmitt-trigger inputs on nA/nB | Accepts slow-rising/falling signals (e.g., mechanical switch bounce, sensor outputs) without external conditioning circuitry. |
| Independent direct reset (nRD) | Allows asynchronous termination of either channel's output pulse - critical for safety interlocks and emergency stop functions. |
| Clamp diode protected inputs | Permits interface to voltages > VCC using series resistors - simplifies mixed-voltage system integration (e.g., 12 V sensors into 5 V logic). |
| Wide temperature range (–40 °C to +125 °C) | Validated for continuous operation in automotive engine control units and industrial motor drives without derating. |
Applications
| Industrial Encoder Debounce | Automotive Door Lock Timing |
|---|---|
|
Use Scenario: Mechanical rotary encoder outputs exhibit contact bounce causing false quadrature counts in motor position feedback. IC Role / Device Role / Timing Role: Monostable channel 1 filters A-phase bounce; channel 2 filters B-phase - each configured for ~10 μs pulse width to suppress transients. Use Value: Eliminates need for firmware debouncing, reducing MCU interrupt load and ensuring deterministic timing alignment between A/B edges. |
Use Scenario: Door lock actuator requires timed enable pulse after key fob command, with immediate abort if unlock request arrives mid-cycle. IC Role / Device Role / Timing Role: Channel 1 generates 500 ms lock pulse; channel 2 uses nRD to terminate it instantly upon unlock signal. Use Value: Hardware-based timing guarantees <100 ns abort latency - meets ISO 11452-4 EMC-critical response requirements. |
| PLC Input Signal Stretching | Power Sequencing Control |
|
Use Scenario: Short-duration sensor alerts (e.g., overtemperature flag) must be stretched to ≥100 ms for reliable PLC scan cycle detection. IC Role / Device Role / Timing Role: Single channel triggered by alert edge; retriggered continuously until host acknowledges via nRD. Use Value: Converts sub-scan-cycle events into persistent logic states - prevents missed alarms in 10 ms scan PLCs. |
Use Scenario: FPGA configuration requires precise 100 ms delay after 12 V rail stabilization before enabling 3.3 V LDO. IC Role / Device Role / Timing Role: Channel 1 triggered by 12 V OK signal; REXT/CEXT set for 100 ms pulse driving LDO EN pin. Use Value: Eliminates external RC+comparator circuitry - reduces BOM count and improves timing accuracy vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT123BQ,115 | TTL-compatible inputs (VIH = 2.0 V min), identical pinout and timing - requires 4.5–5.5 V supply. | Better suited for legacy 5 V TTL systems; not compatible with 3.3 V-only designs. | Select when interfacing with 74LS/74ALS families or where input threshold matching to 5 V logic is required. |
| SN74LV123AQPWRQ1 | Automotive-grade (AEC-Q100), wider VCC range (1.65–5.5 V), lower ICC (1 μA typ), but no Schmitt inputs. | Lacks Schmitt-trigger tolerance - requires clean, fast-rising inputs; preferred for battery-powered automotive ECUs. | Choose for automotive qualification and ultra-low quiescent current; avoid in noisy or slow-signal environments. |
Compared with 74HCT123BQ,115 and SN74LV123AQPWRQ1, the 74HC123BQ,115 uniquely balances wide voltage operation (2.0–6.0 V), Schmitt-trigger noise immunity, and industrial temperature range - making it optimal for mixed-voltage industrial controls where signal integrity and supply flexibility are critical.
Availability
74HC123BQ,115 is available at Aetrix Electronics and suitable for industrial encoder debounce, automotive door lock timing, and PLC input signal stretching requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC123BQ,115 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 with focus on efficiency, reliability, and miniaturization for industrial and automotive markets.
The 74HC123BQ,115 belongs to Nexperia's HC logic family - engineered for low-power, high-noise-immunity timing functions in space-constrained, thermally demanding embedded systems.
FAQ
What is the minimum external capacitor value supported for stable timing?
The datasheet specifies that CEXT values below 50 pF require a power-up reset pulse to prevent spurious output. For stable operation without additional circuitry, use CEXT ≥ 50 pF. The inherent pin capacitance at nREXT/CEXT is ~7 pF, so total effective CEXT must include this parasitic contribution when calculating pulse width.
Can both channels be triggered simultaneously without crosstalk?
Yes - the two monostable sections are fully independent, sharing only VCC and GND. No electrical coupling exists between channels; simultaneous triggering produces uncorrelated outputs with timing governed solely by their respective REXT/CEXT networks and input edges.
Is the exposed thermal pad on the DHVQFN16 package required to be soldered?
No - terminal 1 index area (exposed pad) has no electrical or mechanical requirement to be soldered. If connected, it must remain electrically floating or tied to VCC. Soldering is optional and primarily aids thermal dissipation in high-duty-cycle applications.
How does retriggering affect pulse width calculation?
Retriggering resets the internal timing cycle - the output pulse width equals the time from the *last* valid trigger edge (nA or nB) to the end of the programmed REXT×CEXT interval. The formula tW = K × REXT × CEXT remains valid per retrigger event, with K = 0.45 at VCC = 5.0 V.
74HC123BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- No
- Propagation Delay:
- 65 ns
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DHVQFN (2.5x3.5)
74HC123BQ,115 FAQ
1.How can I place an order for 74HC123BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC123BQ,115 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 74HC123BQ,115 reliable?
The price and inventory of 74HC123BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC123BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HC123BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC123BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC123BQ,115?
74HC123BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC123BQ,115 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 74HC123BQ,115?
For technical support, including 74HC123BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC123BQ,115 requirements.
6.How does Aetrix verify that 74HC123BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HC123BQ,115 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 74HC123BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HC123BQ,115?
All 74HC123BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC123BQ,115, 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 74HC123BQ,115 part is unused and in its original packaging.
Return procedure for 74HC123BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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