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Nexperia USA Inc. 74HCT123PW-Q100,11
- Part No.:
- 74HCT123PW-Q100,11
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT123PW-Q100,11.pdf
- Description:
- IC MULTIVIBRATOR 77NS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,662
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Product details
Overview
74HCT123PW-Q100 from Nexperia is a dual retriggerable monostable multivibrator with independent reset inputs, designed for precise pulse generation and extension in automotive timing circuits. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, delivers <77 ns propagation delay (VCC = 4.5 V), and uses external REXT/CEXT networks to set pulse widths from 75 ns to >450 μs - deployed in engine control unit (ECU) watchdog timeout circuits.
For engineers reviewing the 74HCT123PW-Q100 datasheet, 74HCT123PW-Q100 pinout, 74HCT123PW-Q100 application, or 74HCT123PW-Q100 equivalent, this device is selected when deterministic, retriggerable pulse stretching with direct asynchronous reset is required - especially where TTL-level input compatibility, AEC-Q100 Grade 1 qualification, and TSSOP16 thermal performance are mandatory.
Technical Context
The 74HCT123PW-Q100 implements two independent monostable circuits, each with Schmitt-triggered edge-sensitive inputs (nA: negative-edge, nB: positive-edge) and a dedicated active-low reset (nRD). Pulse width is determined by external REXT and CEXT components connected to pins 7 and 15 (Channel 2) and 14 and 15 (Channel 1), with typical tW = 0.45 × REXT(kΩ) × CEXT(pF) at VCC = 5.0 V.
Retriggering extends output pulses without interruption; a LOW-going edge on nRD terminates the pulse immediately. Input clamping diodes and TTL-compatible VIH/VIL thresholds (2.0 V/0.8 V at VCC = 4.5 V) enable robust interfacing with legacy microcontrollers and sensor outputs in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - matches standard automotive 5 V rail; avoids level-shifting in ECU subsystems. |
| Operating temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood applications. |
| Propagation delay | ≤77 ns (VCC = 4.5 V, CL = 50 pF) - enables sub-13 MHz timing resolution for real-time fault detection. |
| Pulse width range | 75 ns to >450 μs - configurable via REXT (2–1000 kΩ) and CEXT (0–100 nF) for diverse timeout intervals. |
| Input logic type | TTL-compatible - accepts 0.8 V low / 2.0 V high thresholds, ensuring interoperability with 5 V MCU GPIOs. |
| Reset response time | ≤69 ns (VCC = 4.5 V) - guarantees fast abort of erroneous pulses during safety-critical transitions. |
| Output drive strength | ±4 mA (VOH/VOL @ VCC = 4.5 V) - sufficient to directly drive LED indicators or small logic loads. |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-lead, body width 4.4 mm, 0.65 mm pitch - optimized for automated optical inspection (AOI) and high-density PCB layouts in automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Negative-edge triggered input (Channel 1) | Starts Channel 1 monostable on falling edge; Schmitt-triggered for noise immunity. |
| 1B | Positive-edge triggered input (Channel 1) | Starts Channel 1 monostable on rising edge; enables flexible trigger source selection. |
| 1RD | Direct reset input (Channel 1) | Asynchronously forces 1Q LOW and 1Q HIGH on HIGH-to-LOW transition; no setup time required. |
| 1Q / 1Q | Complementary active-HIGH / active-LOW outputs (Channel 1) | Provides both logic polarities for driving NAND/NOR gates or enabling/disabling downstream logic blocks. |
| 1REXT/CEXT | Timing resistor/capacitor node (Channel 1) | Connects external REXT and CEXT to define base pulse width; internal current source sets timing constant. |
| 1CEXT | External capacitor connection (Channel 1) | Grounds CEXT for stable timing; recommended to tie externally to GND (pin 8) to minimize noise coupling. |
| VCC (16) | Supply voltage | 5 V nominal supply; decoupling capacitor (100 nF) required within 5 mm for EMI suppression. |
| GND (8) | Ground reference | Common return for all channels; must be low-impedance plane to maintain timing accuracy. |
| 2A / 2B / 2RD / 2Q / 2Q / 2REXT/CEXT / 2CEXT | Identical functions for Channel 2 | Dual independent operation - no crosstalk; allows synchronized or isolated timing events. |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable architecture | Enables indefinite pulse extension via repeated nA/nB triggers - eliminates need for external counters in long-delay applications. |
| Asynchronous reset | nRD terminates output pulse within ≤69 ns - critical for fail-safe shutdown in airbag or brake control modules. |
| TTL input compatibility | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V - ensures reliable triggering from 5 V MCUs without level shifters. |
| Schmitt-trigger inputs | Hysteresis ≥0.3 V on nA/nB - rejects noise on slow-rising crankshaft position sensor signals. |
| AEC-Q100 Grade 1 qualification | Validated for -40 °C to +125 °C operation with full parametric testing - meets ISO/TS 16949 production requirements. |
Applications
| Engine Control Unit (ECU) Watchdog Timer | Transmission Control Module (TCM) Gear Shift Debounce |
|---|---|
|
Use Scenario: Monitors main CPU heartbeat signal; resets ECU if pulse train stops or exceeds timeout window. IC Role / Device Role / Timing Role: Dual-channel monostable acts as programmable timeout generator - one channel monitors CPU clock, second validates CAN message arrival. Use Value: Configurable tW (via REXT/CEXT) allows tuning to specific firmware execution cycles; retriggering accommodates variable task durations without false resets. |
Use Scenario: Filters mechanical bounce from gear selector switch inputs before feeding to transmission controller. IC Role / Device Role / Timing Role: Each monostable channel conditions one switch contact pair; nRD tied to system enable signal for synchronized startup. Use Value: 10–100 ms pulse width eliminates chatter without software polling; Schmitt inputs tolerate slow-moving potentiometer wipers. |
| Body Control Module (BCM) Door Lock Sequence Timer | Advanced Driver Assistance System (ADAS) Sensor Power-On Reset Delay |
|
Use Scenario: Generates timed enable pulses for door lock actuators after key fob command reception. IC Role / Device Role / Timing Role: Channels configured in cascade - first triggers on RF command, second delays actuator power-up by 200 ms to ensure bus arbitration completes. Use Value: Independent reset per channel allows mid-sequence abort (e.g., if door open detected); TTL inputs interface directly with RF receiver output. |
Use Scenario: Delays power application to radar/LiDAR sensors until power rails stabilize post-ignition. IC Role / Device Role / Timing Role: Single channel used with RC network (REXT = 100 kΩ, CEXT = 100 nF) to generate ~450 μs delay; nRD tied to 5 V regulator OK signal. Use Value: Precise, temperature-stable delay replaces RC+comparator solutions - reduces BOM count and layout area in compact ADAS ECUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC123PW-Q100 | CMOS input thresholds (VIH = 3.15 V min at VCC = 4.5 V); higher noise margin but requires ≥3.15 V logic high. | Suitable for mixed-voltage systems with 3.3 V/5 V interfaces; less tolerant of degraded 5 V MCU outputs. | Select when interfacing with 3.3 V logic or when lower ICC (<8 μA) is prioritized over TTL compatibility. |
| SN74LV123AQPWRQ1 | Lower VCC range (2.0–5.5 V); LV logic family offers better 3.3 V compatibility but lacks AEC-Q100 Grade 1 rating. | Used in non-safety-critical infotainment modules; not qualified for powertrain or chassis applications. | Choose only for cost-sensitive cabin electronics where automotive qualification is not mandated. |
Compared with 74HC123PW-Q100 and SN74LV123AQPWRQ1, the 74HCT123PW-Q100 uniquely balances TTL-level input robustness, AEC-Q100 Grade 1 compliance, and TSSOP16 thermal performance - making it the sole choice for safety-relevant timing in engine/transmission control units.
Availability
74HCT123PW-Q100 is available at Aetrix Electronics and suitable for automotive engine control units, transmission control modules, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT123PW-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, high-reliability logic, analog, and discrete components for automotive, industrial, and consumer markets.
The 74HCT123PW-Q100 belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for deterministic timing functions in safety-critical vehicle subsystems where AEC-Q100 Grade 1 reliability and precise pulse control are non-negotiable.
FAQ
What is the minimum external capacitor value supported for stable pulse width generation?
The datasheet specifies stable operation down to CEXT = 0 pF (with REXT = 5 kΩ), yielding tW ≈ 75 ns. However, for repeatable timing across temperature, CEXT ≥ 100 pF is recommended - the inherent pin capacitance (~7 pF) becomes negligible, and the K-factor formula (tW = 0.45 × REXT × CEXT) applies with <5 % error at VCC = 5.0 V.
Can both monostable channels share the same REXT/CEXT network?
No - each channel requires its own dedicated REXT and CEXT components. Pins 14/15 serve Channel 1; pins 6/7 serve Channel 2. Sharing would cause cross-channel interference and invalid timing due to internal current-source coupling. The functional diagram (Fig. 1) confirms separate timing paths.
How does the Schmitt-trigger action improve noise immunity on nA/nB inputs?
Schmitt-trigger inputs provide ≥0.3 V hysteresis between VIH and VIL thresholds. This prevents multiple false triggers from slowly rising/falling signals (e.g., crankshaft sensor outputs), ensuring only one clean edge initiates the monostable - critical for accurate RPM measurement in noisy engine bays.
Is the VCC pad (pin 1) in the TSSOP16 package electrically connected?
No - pin 1 is a mechanical index marker only, not an electrical pad. The datasheet explicitly states "This is not a supply pin. There is no electrical or mechanical requirement to solder the pad." Soldering it provides no benefit and risks shorting if misaligned.
74HCT123PW-Q100,11 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- No
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74HCT123PW-Q100,11 FAQ
1.How can I place an order for 74HCT123PW-Q100,11 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT123PW-Q100,11 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 74HCT123PW-Q100,11 reliable?
The price and inventory of 74HCT123PW-Q100,11 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT123PW-Q100,11 is usually 5 days.
3.What payment methods are accepted for 74HCT123PW-Q100,11?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT123PW-Q100,11 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT123PW-Q100,11?
74HCT123PW-Q100,11 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT123PW-Q100,11 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 74HCT123PW-Q100,11?
For technical support, including 74HCT123PW-Q100,11 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT123PW-Q100,11 requirements.
6.How does Aetrix verify that 74HCT123PW-Q100,11 is sourced from the original manufacturer or authorized distributors?
All 74HCT123PW-Q100,11 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 74HCT123PW-Q100,11 meets industry standards.
7.What is the process for return or replacement of 74HCT123PW-Q100,11?
All 74HCT123PW-Q100,11 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT123PW-Q100,11, 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 74HCT123PW-Q100,11 part is unused and in its original packaging.
Return procedure for 74HCT123PW-Q100,11:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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