MC14538BFG

Overview

The MC14538BFG is a dual precision retriggerable and resettable monostable multivibrator manufactured by onsemi. It operates within a DC supply voltage range of 3.0 Vdc to 18 Vdc. The device generates accurate output pulses with widths ranging from 10 μs to 10 s, determined by external timing components RX and CX using the formula T = RX • CX. It supports triggering from either the positive edge (A input) or negative-going edge (B input). Electrical characteristics include propagation delays of 600 ns, 300 ns, and 220 ns at 5 V, 10 V, and 15 V respectively. The component is housed in an SOIC-16 package.

Feature Summary

• Dual precision monostable multivibrator architecture allowing independent timing control for two channels.
• Retriggerable and resettable functionality enabling pulse width extension and immediate termination during operation.
• Flexible edge-triggering capability accepting inputs from both rising edges on A terminals and falling edges on B terminals.
• Latched trigger and separate latched reset inputs providing stable state management.

Applications

• Pulse generation circuits requiring precise timing intervals.
• Debouncing switches or contacts to eliminate signal noise.
• Frequency division and pulse stretching applications.

Procurement Notes

Verify the specific ordering suffix 'FG' against official onsemi documentation to confirm package type and compliance status. Ensure compatibility with existing PCB footprints for SOIC-16 packages. Confirm that the procurement channel provides valid traceability for the manufacturer part number MC14538BFG.

Selection Notes

Select this component when dual-channel monostable operation is required with wide pulse width flexibility. Consider the MC14538B over the MC14528B if longer pulse durations exceeding 10 μs are necessary. Verify that the operating voltage range of 3 V to 18 V aligns with the system power supply constraints.

Part Context

The MC14538B belongs to the 4000 series of CMOS logic devices produced by onsemi. It serves as a functional replacement for legacy parts such as the MC14528B and CD4528B (CD4098) due to pin-for-pin compatibility. This integration allows for straightforward upgrades in existing designs requiring dual monostable multivibrator capabilities.

Replacement Considerations

The MC14538B is pin-for-pin compatible with the MC14528B and CD4528B (CD4098). Designers can substitute these parts directly without modifying the circuit layout, provided the electrical specifications meet the application requirements.