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HomeProductsIntegrated Circuits (ICs)Logic - Multivibrators74VHC123AM
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74VHC123AM - Fairchild Semiconductor

Manufacturer Part Number
74VHC123AM
Manufacturer
Fairchild (onsemi)
Allelco Part Number
32D-74VHC123AM
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
11,970 pcs available, New & Original
Parts Description
MONOSTABLE MULTIVIBRATOR, AHC/VH
Package
16-SOIC
Data sheet
-
RoHs Status
 
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In stock: 11970

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Specifications

74VHC123AM Tech Specifications
Fairchild Semiconductor - 74VHC123AM technical specifications, attributes, parameters and parts with similar specifications to Fairchild Semiconductor - 74VHC123AM

Product Attribute Attribute Value
Manufacturer Fairchild (onsemi)
Voltage - Supply 2 V ~ 5.5 V
Supplier Device Package 16-SOIC
Series 74VHC
Schmitt Trigger Input Yes
Propagation Delay 8.1 ns
Package / Case 16-SOIC (0.154", 3.90mm Width)
Product Attribute Attribute Value
Package Bulk
Operating Temperature -40°C ~ 85°C
Mounting Type Surface Mount
Logic Type Monostable
Independent Circuits 2
Current - Output High, Low 8mA, 8mA
Base Product Number 74VHC123

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

What is the propagation delay of the 74VHC123AM and how does it impact high-speed digital circuit design?
The 74VHC123AM offers a propagation delay of 8.1 ns, which enables precise timing control in fast-switching logic systems. This low latency is critical when synchronizing multiple signal paths or generating narrow pulse widths, such as in clock recovery or event detection circuits. Designers leveraging this device can implement compact timing loops without introducing significant skew, provided layout parasitics are minimized through controlled impedance routing and short trace lengths.
How do the input thresholds of the 74VHC123AM compare to standard TTL levels, and what implications does this have for mixed-voltage interfacing?
The 74VHC123AM features Schmitt trigger inputs that provide hysteresis, typically centered around 1.6 V at 3.3 V supply. This differs from standard TTL’s fixed 1.4 V threshold by incorporating noise immunity through positive feedback. When interfacing with older TTL logic running at 5 V, the higher hysteresis ensures clean transitions even with slow-edge signals or moderate noise—making it suitable for bridging legacy and modern CMOS systems without level-shifting circuitry in many cases.
Can the 74VHC123AM reliably drive capacitive loads typical in PCB traces, and what output current specifications should guide driver selection?
The 74VHC123AM can source and sink up to 8 mA at both high and low outputs, sufficient for most standard PCB trace capacitances under 100 pF over short distances. However, driving long interconnects or multiple parallel loads may require buffer insertion or series termination. For example, a 50 pF load at 5 V switching would draw ~20 mA peak current; while within absolute limits, sustained operation near maximum current increases power dissipation and risks thermal derating in dense layouts.
In what scenarios would the dual independent circuits of the 74VHC123AM be preferred over single-circuit alternatives like the 74VHC125?
The 74VHC123AM integrates two monostable multivibrators per package, enabling synchronized pulse generation from separate triggers—ideal for dual-clock domain handshaking or staggered interrupt handling in embedded controllers. Unlike the 74VHC125 (a quad buffer), the 74VHC123AM provides deterministic timing edges rather than signal buffering, making it preferable when precise width control is needed across two channels with shared timing resources, such as in UART baud-rate generation or LED blink sequencing with phase offset.
How does operating temperature affect timing accuracy in the 74VHC123AM across its -40°C to +85°C range?
While the datasheet specifies propagation delay only at room temperature, semiconductor mobility changes with temperature cause slight shifts in delay—typically less than ±10% over industrial extremes. At -40°C, carrier velocity decreases slightly, increasing delay marginally; conversely, higher temperatures reduce resistance but increase leakage, potentially affecting rise/fall times. Designers targeting tight timing budgets should allocate margin or use temperature-compensated reference clocks when using the 74VHC123AM in automotive or industrial edge applications.
What substitution options exist for the 74VHC123AM, and how do variants like SN74AHC123AMDREP differ functionally?
Valid substitutes include SN74AHC123AMDREP (TI), 74AHC123AD (NXP), and 74VHC123AMX (onsemi). Key differences lie in voltage range and packaging: AHC versions operate down to 2 V, while VHC supports up to 5.5 V. Both share similar propagation delays (~8–10 ns) and Schmitt inputs, but AHC has lower quiescent current. Substitution is generally safe if supply compatibility aligns, though verify package thermal performance under identical load conditions due to minor die size variations between manufacturers.
What layout considerations are essential when placing the 74VHC123AM on a high-speed PCB to preserve signal integrity?
Minimize trace inductance near output pins by keeping leads short (<5 mm) and avoiding vias where possible. Place decoupling capacitors (0.1 µF ceramic) within 2 mm of the VCC pin to suppress supply transients during fast edge transitions. Ground plane continuity beneath the SOIC footprint reduces ground bounce, which could distort Schmitt thresholds. Avoid routing sensitive timing signals adjacent to noisy lines—especially switching power rails—to prevent coupling into the 8.1 ns glitch window.
Is the 74VHC123AM suitable for generating sub-microsecond pulses, and what external components define pulse width accuracy?
Yes, the 74VHC123AM can produce pulses as narrow as tens of nanoseconds when configured with small RC networks. Pulse width is set by an external resistor and capacitor connected to the RESET pin, following t_W = 0.7 × R × C. For example, R = 1 kΩ and C = 100 pF yield ~70 ns pulses. Accuracy depends on capacitor tolerance (±5% X7R recommended) and resistor precision; tighter timing requires calibrated components or digital calibration loops if used in measurement applications.
How does Moisture Sensitivity Level (MSL) = 1 benefit manufacturing integration of the 74VHC123AM compared to higher-level devices?
With MSL = 1, the 74VHC123AM is exempt from moisture pre-conditioning before reflow soldering, simplifying assembly flow and reducing handling steps in volume production. This also minimizes risk of popcorning during thermal cycling—critical when sourcing from contract manufacturers with variable storage conditions. Combined with RoHS3 compliance, it supports streamlined global supply chains without requiring special packaging or dry-bag storage protocols.

Parts with Similar Specifications

The three parts on the right have similar specifications to Fairchild Semiconductor 74VHC123AM

Product Attribute 74VHC123AMTC 74VHC123AM 74VHC123AMTCX 74VHC123AMX
Part Number 74VHC123AMTC 74VHC123AM 74VHC123AMTCX 74VHC123AMX
Manufacturer onsemi onsemi onsemi onsemi
Schmitt Trigger Input - - - -
Series - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Current - Output High, Low - - - -
Independent Circuits - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Supply - - - -
Propagation Delay - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Mounting Type - Surface Mount Through Hole Surface Mount
Logic Type - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
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Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
74VHC123AM Image

74VHC123AM

Fairchild Semiconductor
32D-74VHC123AM

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