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
Key Features
- 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
Applications
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.
Specifications
| 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 |
Alternate & Equivalent Parts
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.
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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.
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