MM74HC123AJ Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
MM74HC123AJ is a dual retriggerable monostable multivibrator IC from Texas Instruments in the HC/UH logic family. It features two independent one-shot circuits with complementary outputs and is housed in a 16-Pin ceramic DIP package for high-reliability applications. Available from stock worldwide.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- MM74HC123AJ Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MM74HC123AJ?
- Dual retriggerable monostable multivibrator with two independent channels, each with complementary Q and Q-bar outputs for flexible timing circuit design
- HC/UH logic family provides wide voltage range compatibility and high noise immunity for use in harsh industrial and military environments
- Ceramic glass-sealed 16-Pin DIP package (GDIP) offers superior reliability and resistance to moisture, making it ideal for high-reliability and defense applications
- Two data/clock inputs per channel support both positive and negative edge triggering, giving designers full control over pulse generation timing
What is MM74HC123AJ used for?
The MM74HC123AJ is used in timing and pulse generation circuits where retriggerable one-shot behavior is required, such as watchdog timers, debounce circuits, and modem synchronization logic. Its dual independent channels allow two separate timing functions to be implemented with a single IC, reducing board space in industrial control and telecommunications equipment. The ceramic glass-sealed package makes it especially well-suited for military, aerospace, and harsh-environment applications requiring long-term moisture resistance and high reliability.
What are the specifications of MM74HC123AJ?
| YTEOL | 0 |
| Additional Feature | LG_MAX |
| Family | HC/UH |
| JESD-30 Code | R-GDIP-T16 |
| Logic IC Type | MONOSTABLE MULTIVIBRATOR |
| Number of Data/Clock Inputs | 2 |
| Number of Functions | 2 |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Propagation Delay (tpd) | 229ns |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the MM74HC123AJ datasheet?
MM74HC123AJ Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for MM74HC123AJ?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What does retriggerable mean for the MM74HC123AJ monostable multivibrator?
Retriggerable means that if a new trigger pulse arrives before the current output pulse has completed, the output pulse is extended from the moment of the new trigger. This is important in applications like watchdog timers where an ongoing signal must continuously reset the timer to prevent a timeout fault from being registered.
How many independent one-shot circuits are in the MM74HC123AJ?
The MM74HC123AJ contains two independent monostable multivibrator circuits, each with its own trigger inputs, external R/C timing components, and complementary Q and Q-bar outputs. This allows two separate pulse-width timing functions to be implemented using a single 16-Pin DIP package.
What is the significance of the ceramic DIP package for the MM74HC123AJ?
The MM74HC123AJ uses a ceramic glass-sealed 16-Pin DIP package (JESD-30 Code: R-GDIP-T16). Ceramic packages provide superior hermetic sealing compared to plastic packages, offering excellent resistance to moisture ingress and wide temperature cycling. This makes the device suitable for military, aerospace, and industrial applications that require long-term reliability under harsh conditions.
What logic family does the MM74HC123AJ belong to?
The MM74HC123AJ is part of the HC/UH (High-Speed CMOS) logic family. HC devices operate over a wide supply voltage range (typically 2V to 6V) and offer high noise immunity and low power consumption compared to older TTL families, making them suitable for both 3.3V and 5V digital systems.
What are typical applications for the MM74HC123AJ?
Typical applications include pulse stretching and delay generation, switch debounce circuits, clock pulse width control, modem timing, and watchdog timeout circuits. The retriggerable dual one-shot architecture is particularly useful in systems that need to generate precise timing pulses from noisy or irregular input signals.
Related Guides
STM32H725IGT3 Selection Guide: Memory, Package, Temperature, and Supply
Choose the right STM32H725 variant by comparing Flash, package, pin count, temperature grade, connectivity, and production requirements.
Aug 1, 2026
STM32H725IGT3 High-Performance MCU Design Guide
Design STM32H725IGT3 systems for reliable 550 MHz operation with practical power, clock, cache, DMA, PCB, ADC, and recovery guidance.
Jul 31, 2026
150141VS73100 Violet SMD LED Selection Guide: Color, Drive, and Sourcing
Select the 150141VS73100 by wavelength, brightness, drive current, 3528 fit, reliability, and traceable sourcing requirements.
Jul 31, 2026
STEF05SGR 5 V eFuse Protection Design Guide
Design a reliable 5 V STEF05SGR eFuse stage with current-limit math, capacitor sizing, thermal analysis, fault recovery, and PCB layout guidance.
Jul 30, 2026
Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“We've been using FindMyChip for 2 years. Pricing is consistently 20-30% below Mouser/DigiKey for volume orders.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit