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Nexperia USA Inc. 74HC123D-Q100,118
- Part No.:
- 74HC123D-Q100,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HC123D-Q100,118.pdf
- Description:
- IC MULTIVIBRATOR 65NS 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,025
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Product details
Overview
74HC123D-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 2.0 V to 6.0 V, supports -40 °C to +125 °C ambient range, delivers <75 ns minimum pulse width (REXT = 5 kΩ, CEXT = 0 pF), and features Schmitt-trigger inputs on nA/nB for robust edge detection. It is used in engine control unit (ECU) fault pulse stretching and transmission sensor signal conditioning.
For engineers reviewing the 74HC123D-Q100 datasheet, 74HC123D-Q100 pinout, 74HC123D-Q100 application, or 74HC123D-Q100 equivalent, this device serves as a qualified AEC-Q100 Grade 1 timing solution where retriggerable pulse extension, direct reset termination, and high-noise-immunity input thresholds are required in safety-critical automotive subsystems.
Technical Context
The 74HC123D-Q100 implements two independent monostable circuits, each with separate negative-edge (nA) and positive-edge (nB) trigger inputs, a dedicated reset input (nRD), and complementary active-HIGH/active-LOW outputs (nQ/nQ). Pulse width is externally set via REXT and CEXT at pins 15/7 (Channel 1) and 14/6 (Channel 2), with programmability down to 75 ns and scalability to microseconds using standard RC networks.
Each channel supports retriggering during an active output pulse to extend duration indefinitely, and immediate termination via LOW-going edge on nRD. Schmitt-trigger action on nA/nB ensures reliable operation with slow-rising signals, while input clamp diodes allow interfacing to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.0 V to 6.0 V - enables direct integration into 3.3 V and 5 V automotive domains without level-shifting. |
| Operating temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood ECU and powertrain applications. |
| Minimum pulse width | 75 ns (REXT = 5 kΩ, CEXT = 0 pF) - supports high-speed timing windows such as ignition spark windowing or CAN bus glitch suppression. |
| Propagation delay | 24 ns (VCC = 6.0 V) - ensures deterministic response for time-critical diagnostics and watchdog timeout generation. |
| Input threshold type | Schmitt-trigger on nA/nB - rejects noise on slow-slew sensor signals (e.g., crankshaft position sensors) without external hysteresis circuitry. |
| Reset response | <65 ns (VCC = 6.0 V) - guarantees sub-100 ns abort of output pulses during fault detection events. |
| Output drive strength | ±4 mA (VOH/VOL @ VCC = 4.5 V) - sufficient to directly drive LED indicators, small MOSFET gates, or logic inputs without buffers. |
Pinout & Package
74HC123D-Q100 is housed in a plastic SO16 (SOT109-1) package: 16-pin small outline, 3.9 mm body width, gull-wing leads, JEDEC MS-012 compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9, 10 | nA / nB trigger inputs (Ch1/Ch2) | Edge-sensitive inputs: Pin 1 (1A) = negative-edge; Pin 2 (1B) = positive-edge; Pin 9 (2A), Pin 10 (2B) = same for Channel 2. |
| 3, 11 | nRD reset inputs (Ch1/Ch2) | Active-LOW asynchronous reset: LOW-going edge terminates ongoing output pulse immediately. |
| 4, 13 | nQ outputs (Ch1/Ch2) | Active-HIGH outputs - Pin 4 = 1Q, Pin 13 = 2Q; synchronized with nQ complements. |
| 5, 12 | nQ outputs (Ch1/Ch2) | Active-LOW outputs - Pin 5 = 2Q, Pin 12 = 1Q; provide complementary timing signals for latch or enable control. |
| 6, 14 | nCEXT capacitor terminals (Ch2/Ch1) | External timing capacitor connections - must be grounded externally per Fig. 11 to minimize noise coupling. |
| 7, 15 | nREXT/CEXT resistor-capacitor nodes (Ch2/Ch1) | Shared R/C connection points - define basic pulse width; inherent pin capacitance ≈7 pF affects low-value CEXT accuracy. |
| 8 | GND | Ground reference for all internal circuitry and external timing components. |
| 16 | VCC | Primary supply rail - decoupling capacitor (100 nF ceramic) required within 5 mm for stable timing performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use across -40 °C to +125 °C, including thermal cycling, humidity, and vibration stress tests. |
| Retriggerable pulse extension | Enables indefinite pulse stretching by repeated nA/nB triggers - eliminates need for external counters or microcontroller intervention in timeout circuits. |
| Direct asynchronous reset | nRD input forces immediate nQ/nQ transition regardless of current pulse state - critical for fail-safe shutdown in ADAS or braking modules. |
| CMOS-level input compatibility | VIH = 3.15 V (min @ VCC = 4.5 V), VIL = 1.35 V (max) - interfaces directly with 3.3 V MCU GPIOs and legacy 5 V logic without translators. |
| Input clamp diode protection | Supports interface to >VCC signals (e.g., 12 V sensor outputs) using series current-limiting resistors - reduces BOM count in mixed-voltage systems. |
Applications
| Engine Control Unit Timing | Transmission Sensor Interface |
|---|---|
|
Use Scenario: Extending crankshaft position sensor pulse width to meet ECU minimum sampling window requirements during low-RPM operation. IC Role / Device Role / Timing Role: Dual-channel monostable stretches individual sensor pulses independently while rejecting noise-induced false triggers via Schmitt inputs. Use Value: Eliminates missed ignition events at idle by guaranteeing ≥10 μs pulse width even with degraded sensor signal slew rate. |
Use Scenario: Converting variable-duty-cycle solenoid feedback signals into clean, fixed-width diagnostic pulses for CAN message encoding. IC Role / Device Role / Timing Role: One channel conditions solenoid ON-time; second channel generates synchronized status strobes for microcontroller capture. Use Value: Enables real-time solenoid health monitoring without adding ADC resources or firmware overhead. |
| Brake-by-Wire Fault Response | ADAS Camera Sync Generator |
|
Use Scenario: Generating a precisely timed, resettable fault-hold pulse upon detection of brake pressure sensor anomaly. IC Role / Device Role / Timing Role: Monostable triggered by MCU fault flag; extended via retriggering if fault persists; terminated instantly by hardware reset signal. Use Value: Provides fail-operational hold time (e.g., 200 ms) that survives MCU lockup, meeting ISO 26262 ASIL-B timing constraints. |
Use Scenario: Creating frame-sync pulses for multi-camera fusion systems where master clock jitter must be minimized. IC Role / Device Role / Timing Role: Uses stable external REXT/CEXT network to generate low-jitter sync edges; Schmitt inputs reject EMI on camera trigger lines. Use Value: Reduces inter-camera frame misalignment from >500 ns (direct MCU GPIO) to <100 ns, improving stereo depth accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT123D-Q100 | TTL-compatible inputs (VIH = 2.0 V min); identical pinout, timing, and packaging. | Better suited for mixed 5 V TTL/CMOS systems; requires no level translation when driven by legacy 5 V logic. | Select when interfacing with older automotive modules using 5 V TTL signaling standards. |
| SN74LV123AQPWRQ1 | Lower VCC range (1.65–5.5 V); higher ICC (160 μA max); same AEC-Q100 Grade 1 rating. | Optimized for 1.8 V/3.3 V domains; not compatible with 2.0 V minimum HC logic; lacks clamp diodes. | Choose for next-gen low-voltage ECUs where supply headroom is constrained below 2.0 V. |
Compared with 74HC123D-Q100, the 74HCT123D-Q100 offers seamless integration into legacy 5 V automotive logic buses, while the SN74LV123AQPWRQ1 supports newer low-power domains but sacrifices input overvoltage tolerance and sub-2 V operation.
Availability
74HC123D-Q100 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and brake-by-wire systems requiring stable component supply across automotive production lifecycles.
Supply support for 74HC123D-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 focused on essential efficiency technologies, delivering high-performance logic, analog, and discrete devices for automotive, industrial, and consumer markets.
The 74HC123D-Q100 belongs to Nexperia's AEC-Q100-qualified logic portfolio, engineered specifically for automotive timing functions demanding retriggerability, deterministic reset, and wide-temperature reliability.
FAQ
What is the minimum external capacitor value supported for stable pulse width generation?
The datasheet specifies grounding pins 6 (2CEXT) and 14 (1CEXT) externally to GND to minimize noise. For stable operation, CEXT ≥ 10 pF is recommended; values below 10 pF increase sensitivity to parasitic capacitance (≈7 pF inherent at REXT/CEXT pins), causing timing inaccuracy. Below 5 pF, pulse width becomes unpredictable.
Can both channels be triggered simultaneously without crosstalk?
Yes - the two monostable sections are fully independent. Simultaneous triggering of nA/nB on either channel has no electrical or timing interaction with the other channel. Propagation delays, pulse widths, and reset actions remain isolated, verified per functional Table 3 and dynamic characteristics in Section 10.
How does the device behave during power-up without external reset?
At power-on, residual charge on CEXT may cause an unintended output pulse. To prevent this, the datasheet recommends applying a reset pulse to nRD after VCC stabilizes (Fig. 12). The internal power-on reset circuit is not implemented; external reset coordination is mandatory for deterministic startup behavior.
Is the SO16 package lead-free and RoHS-compliant?
Yes - the 74HC123D-Q100 in SOT109-1 (SO16) package meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations. Nexperia confirms full compliance with JEDEC J-STD-609 Category 3 moisture sensitivity level (MSL3) and halogen-free material declarations per IEC 61249-2-21.
74HC123D-Q100,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- 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:
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HC123D-Q100,118 FAQ
1.How can I place an order for 74HC123D-Q100,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC123D-Q100,118 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 74HC123D-Q100,118 reliable?
The price and inventory of 74HC123D-Q100,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC123D-Q100,118 is usually 5 days.
3.What payment methods are accepted for 74HC123D-Q100,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC123D-Q100,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC123D-Q100,118?
74HC123D-Q100,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC123D-Q100,118 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 74HC123D-Q100,118?
For technical support, including 74HC123D-Q100,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC123D-Q100,118 requirements.
6.How does Aetrix verify that 74HC123D-Q100,118 is sourced from the original manufacturer or authorized distributors?
All 74HC123D-Q100,118 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 74HC123D-Q100,118 meets industry standards.
7.What is the process for return or replacement of 74HC123D-Q100,118?
All 74HC123D-Q100,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC123D-Q100,118, 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 74HC123D-Q100,118 part is unused and in its original packaging.
Return procedure for 74HC123D-Q100,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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