SN54123J

Overview

The SN54123J is a military-grade retriggers monostable multivibrator manufactured by Texas Instruments. It operates within a supply voltage range of 4.75 V to 5.25 V and supports an extended temperature range from -55 °C to 125 °C. The device features two independent circuits housed in a 16-pin ceramic dual in-line package (CDIP). Key electrical specifications include a maximum propagation delay of 25 ns, a minimum pulse width of 30 ns, and a maximum quiescent current of 8 mA.

Feature Summary

• Retriggerable operation allows pulse width extension via additional trigger inputs during the timing cycle.
• Complementary outputs provide both true and inverted logic states for flexible circuit interfacing.
• Internal timing resistor enables simplified external component requirements using only a capacitor.
• Overriding clear input terminates the output pulse prematurely when activated.

Applications

• Precision timing generation in aerospace systems
• Debounce circuits for mechanical switches in harsh environments
• Pulse width modulation signal conditioning
• One-shot triggering for digital counters

Procurement Notes

Verify that the specific order contains the 'SN54' prefix to confirm military qualification. Ensure the package suffix matches the required CDIP form factor. Confirm RoHS exemption status as these parts are typically non-compliant with standard environmental directives due to leaded construction.

Selection Notes

Select this component when radiation tolerance and wide temperature stability are mandatory. Compare against SN54LS123J if lower power consumption is not the primary constraint. Verify pin compatibility with existing layouts before substituting with commercial grade variants.

Part Context

This part belongs to the SN54xx series designed for defense and space applications. It shares functional similarities with the SN74123 but offers superior environmental resilience. The SN54123J serves as the ceramic DIP variant within the broader family of monostable multivibrators produced by Texas Instruments.

Replacement Considerations

Direct equivalent: SN54LS123J. Alternative ceramic packages: SNJ54123J. Military qualified versions include JM38510/31401BEA.

FAQ

Does the SN54123J include an internal timing resistor?

Yes, the device integrates an internal timing resistor, allowing users to program the pulse width using only an external capacitor.

What is the maximum operating temperature for this component?

The SN54123J is rated for a maximum operating temperature of 125 °C, suitable for demanding military environments.