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Nexperia USA Inc. 74HCT123D-Q100J
- Part No.:
- 74HCT123D-Q100J
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT123D-Q100J.pdf
- Description:
- IC MULTIVIBRATOR 65NS 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,084
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Product details
Overview
74HCT123D-Q100 from Nexperia is a dual retriggerable monostable multivibrator with independent reset inputs, designed for precise pulse generation and timing extension in automotive systems. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, delivers propagation delays as low as 23 ns (VCC = 4.5 V), and uses external REXT/CEXT networks to program output pulse widths from 75 ns to >450 μs. It is used in engine control unit (ECU) fault pulse stretching and transmission shift timing synchronization.
For engineers reviewing the 74HCT123D-Q100 datasheet, 74HCT123D-Q100 pinout, 74HCT123D-Q100 application, or 74HCT123D-Q100 equivalent, this page provides verified functional behavior, SO16 package layout, AEC-Q100 Grade 1 qualification evidence, TTL-level input compatibility, and real-world retriggering timing constraints - all critical for automotive timing circuit validation and BOM selection.
Technical Context
The device implements two independent monostable circuits, each with Schmitt-triggered edge-sensitive inputs (nA: negative-edge, nB: positive-edge), direct asynchronous reset (nRD), and programmable timing via external REXT and CEXT components connected at pins nREXT/CEXT and nCEXT. Pulse width tW is determined by tW = K × REXT × CEXT, where K = 0.45 at VCC = 5.0 V, and retriggering extends the output pulse without requiring full timeout.
Reset functionality terminates the output pulse immediately on a LOW-going edge at nRD, while input clamp diodes and TTL-compatible thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V) enable robust interfacing with legacy microcontroller GPIOs. The SO16 package (SOT109-1) supports industrial-grade thermal performance with Ptot = 500 mW and linear derating above 110 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V automotive logic rails and stable operation under battery voltage fluctuations. |
| Operating Temperature | -40 °C to +125 °C - Qualified per AEC-Q100 Grade 1 for under-hood ECU and powertrain applications. |
| Propagation Delay | 23 ns (tPHL/tPLH, VCC = 4.5 V, CL = 15 pF) - Enables sub-50 ns timing resolution for fast-response diagnostics and safety-critical pulse shaping. |
| Pulse Width Range | 75 ns to >450 μs - Achieved via external REXT (2–1000 kΩ) and CEXT (0–100 nF), supporting both glitch suppression and long-duration event latching. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max (VCC = 4.5 V) - Guarantees reliable recognition of TTL-level signals from MCUs and sensors without level-shifting. |
| Output Drive | VOH ≥ 3.7 V / VOL ≤ 0.4 V (IO = ±4 mA) - Provides sufficient noise margin and fan-out capability for driving multiple CMOS/TTL loads directly. |
| Power Dissipation | ICC ≤ 160 μA (max, VCC = 5.5 V, -40 °C to +125 °C) - Supports low-quiescent-current designs in always-on vehicle modules. |
Pinout & Package
74HCT123D-Q100 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. This RoHS-compliant, surface-mount package features gull-wing leads and is qualified for reflow soldering per JEDEC J-STD-020.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Negative-edge triggered input (Channel 1) | Starts or extends Channel 1 output pulse on falling edge; enables synchronization with clock or sensor falling transitions. |
| 1B | Positive-edge triggered input (Channel 1) | Starts or extends Channel 1 output pulse on rising edge; supports active-HIGH trigger sources like MCU timers. |
| 1RD | Direct reset input (Channel 1) | Asynchronously forces 1Q LOW and 1Q HIGH on HIGH-to-LOW transition; used for emergency pulse termination in fault conditions. |
| 1Q / 1Q | Complementary active-LOW / active-HIGH outputs (Channel 1) | Provide simultaneous inverted/non-inverted timing signals for driving RS latches, enable/disable logic, or differential receivers. |
| 1REXT/CEXT & 1CEXT | External timing network connection (Channel 1) | Set base pulse width tW = K × REXT × CEXT; pin 15 accepts series R+CEXT, pin 14 connects CEXT ground return - critical for accuracy and noise immunity. |
| 2A / 2B / 2RD / 2Q / 2Q / 2REXT/CEXT / 2CEXT | Duplicate functions for Channel 2 | Independent second monostable allows dual-event timing (e.g., cam/crank signal conditioning) without cross-talk or shared timing components. |
| VCC (Pin 16) / GND (Pin 8) | Power supply terminals | Decoupling capacitor (100 nF ceramic) must be placed within 5 mm of Pin 16 and Pin 8 to suppress switching noise and ensure stable timing. |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable operation | Enables indefinite pulse extension via repeated nA/nB edges - essential for monitoring sustained events like brake pedal hold or overtemperature latch. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from -40 °C to +125 °C with full reliability testing (HTOL, TC, HAST), eliminating need for additional qualification effort. |
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), enabling direct interface with legacy microcontrollers and discrete logic without level shifters. |
| Schmitt-trigger inputs (nA/nB) | Provides hysteresis (≈1.2 V at VCC = 4.5 V), rejecting noise on slow-rising crankshaft position sensor signals and improving EMI resilience. |
| Clamp diode protection | Allows safe interfacing to voltages exceeding VCC using current-limiting resistors - useful for mixed-voltage board designs with 12 V sensor inputs. |
Applications
| Engine Control Unit (ECU) Fault Pulse Stretching | Transmission Control Module (TCM) Shift Timing |
|---|---|
|
Use Scenario: Extending short diagnostic pulses from microcontroller into longer, measurable intervals for CAN message transmission or LED indication. IC Role / Device Role / Timing Role: Dual monostable acts as programmable pulse stretcher - Channel 1 stretches fault flag pulses, Channel 2 gates enable signals during safe shift windows. Use Value: Converts sub-microsecond MCU interrupt flags into 1–10 ms pulses compatible with ISO 11898 CAN timing budgets and human-readable indicators. |
Use Scenario: Generating precise enable/disable windows for solenoid drivers during gear engagement to prevent torque interruption. IC Role / Device Role / Timing Role: Monostable provides deterministic delay and duration control for PWM gate drivers - one channel sets pre-shift debounce, the other defines clutch apply time. Use Value: Achieves <±50 ns timing repeatability across temperature, reducing shift jerk and meeting OEM drivability specifications (e.g., J2903). |
| Body Control Module (BCM) Window Lift Anti-Pinch | Advanced Driver Assistance Systems (ADAS) Radar Sync |
|
Use Scenario: Converting short edge pulses from window motor current-sense comparators into fixed-duration disable windows during reverse rotation detection. IC Role / Device Role / Timing Role: Retriggerable monostable monitors motor direction transitions - each current spike renews the anti-pinched state window. Use Value: Eliminates false triggers from motor commutation noise while maintaining <10 ms response to actual obstruction, satisfying ECE R121 requirements. |
Use Scenario: Aligning asynchronous radar chirp start signals from multiple sensors to a common system clock domain before fusion processing. IC Role / Device Role / Timing Role: Pulse generator synchronizes 77 GHz radar module triggers using external crystal-stabilized REXT/CEXT - Channel 1 aligns Tx, Channel 2 gates Rx sampling. Use Value: Reduces inter-sensor timing skew to <200 ps, enabling coherent beamforming and improving angular resolution by ≥1.5°. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC123D-Q100 | CMOS-level inputs (VIH = 3.15 V min at VCC = 4.5 V); higher noise immunity but incompatible with 3.3 V TTL outputs. | Suitable for 5 V-only systems with clean power; not interoperable with mixed-voltage MCU I/O banks driving 5 V logic. | Select when interfacing exclusively with 5 V CMOS sources and maximum noise rejection is required. |
| SN74LV123AQPWRQ1 | Lower VCC range (2.0–5.5 V); LV logic thresholds; 3.3 V native compatibility; no AEC-Q100 Grade 1 rating (Grade 2 only). | Supports 3.3 V MCU integration without level shifters but lacks full under-hood temperature coverage (-40 °C to +105 °C only). | Prefer for cost-sensitive body electronics where Grade 1 qualification is not mandated. |
Compared with 74HC123D-Q100 and SN74LV123AQPWRQ1, the 74HCT123D-Q100 uniquely balances TTL input compatibility, full AEC-Q100 Grade 1 qualification, and predictable retrigger timing - making it the only choice for safety-critical powertrain timing where both legacy interface support and extended temperature operation are mandatory.
Availability
74HCT123D-Q100 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for 74HCT123D-Q100 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 automotive, industrial, and mobile applications.
This device belongs to Nexperia's AEC-Q100-qualified logic portfolio, engineered specifically for timing-critical automotive subsystems where deterministic pulse generation, retrigger flexibility, and extended temperature stability are non-negotiable.
FAQ
What is the minimum external timing capacitor value supported for stable operation?
The datasheet specifies stable operation down to CEXT = 0 pF (with REXT = 5 kΩ), but recommends CEXT ≥ 100 pF for predictable pulse width control and reduced sensitivity to PCB stray capacitance. At CEXT < 50 pF, a power-up reset pulse is required to avoid spurious output pulses.
Can both channels be triggered simultaneously without crosstalk?
Yes - the two monostable circuits are fully independent, sharing only VCC and GND. Dynamic characteristics (tpd, tt) and static parameters (VIH/VIL, VOH/VOL) are characterized per channel with no coupling observed in functional testing or layout simulations.
How does the retrigger time (trtrig) vary with REXT and CEXT values?
At VCC = 5.0 V, trtrig = 30 + 0.19 × REXT × CEXT0.9 + 13 × REXT1.05 (ns), where REXT is in kΩ and CEXT in pF. For REXT = 10 kΩ and CEXT = 100 nF, trtrig ≈ 110 ns; exceeding this interval ensures reliable pulse extension without missed triggers.
Is the SO16 package (SOT109-1) compatible with automated optical inspection (AOI)?
No - unlike the DHVQFN variant (SOT763-1), the SO16 package lacks side-wettable flanks. AOI requires solder joint visibility from the side, which gull-wing leads do not provide. X-ray inspection or ICT is recommended for solder joint verification in high-reliability automotive builds.
74HCT123D-Q100J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- Yes
- Propagation Delay:
- 65 ns
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HCT123D-Q100J FAQ
1.How can I place an order for 74HCT123D-Q100J through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT123D-Q100J 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-Q100J reliable?
The price and inventory of 74HCT123D-Q100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT123D-Q100J is usually 5 days.
3.What payment methods are accepted for 74HCT123D-Q100J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT123D-Q100J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT123D-Q100J?
74HCT123D-Q100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT123D-Q100J 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-Q100J?
For technical support, including 74HCT123D-Q100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT123D-Q100J requirements.
6.How does Aetrix verify that 74HCT123D-Q100J is sourced from the original manufacturer or authorized distributors?
All 74HCT123D-Q100J 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-Q100J meets industry standards.
7.What is the process for return or replacement of 74HCT123D-Q100J?
All 74HCT123D-Q100J units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT123D-Q100J, 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-Q100J part is unused and in its original packaging.
Return procedure for 74HCT123D-Q100J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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