MC14538BFELG

Overview

The MC14538BFELG 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. Key electrical characteristics include propagation delays of 600 ns, 300 ns, and 220 ns at 5 V, 10 V, and 15 V respectively. It features latched trigger inputs and separate latched reset inputs, capable of driving two low-power TTL loads or one low-power Schottky TTL load.

Feature Summary

• Dual precision monostable multivibrator architecture supporting independent timing for two channels
• Retriggerable and resettable functionality allowing pulse width extension and immediate termination
• Flexible triggering from positive edge (A input) or negative-going edge (B input)
• Latched trigger and reset inputs ensuring stable operation without continuous signal presence

Applications

• Timing generation circuits requiring precise pulse width control
• Debouncing switches or contacts in digital logic systems
• Frequency division and pulse stretching applications
• Timer circuits for industrial control and instrumentation

Procurement Notes

Verify the specific ordering suffix BFELG against the manufacturer's current datasheet to confirm package type and availability status. Confirm RoHS compliance and lead-free requirements match project specifications. Check for automotive qualification prefixes if AEC-Q100 standards are required. Ensure ESD precautions are observed during handling due to high-impedance CMOS inputs.

Selection Notes

Select this component when dual-channel monostable operation is needed with wide pulse width flexibility. Consider the MC14538B over the MC14528B for longer pulse widths up to 10 seconds. Use the MC54/74HC4538A only if pulse widths below 10 μs are required with supplies up to 6 V. Verify that external timing components RX and CX values fall within recommended leakage and capacitance limits for desired accuracy.

Part Context

The MC14538B belongs to the 4000 series of CMOS logic devices. It is pin-for-pin compatible with the MC14528B and CD4528B (CD4098). The device is part of onsemi's standard product line, offering robust performance across industrial temperature ranges. It serves as a fundamental building block for timing and waveform generation in mixed-signal systems.

Replacement Considerations

MC14528B: Pin-compatible alternative with different pulse width characteristics. CD4528B (CD4098): Functionally equivalent device from other manufacturers. NLV14538BDR2G: Automotive qualified version with AEC-Q100 certification. MC54/74HC4538A: High-speed CMOS alternative for sub-10 μs pulses.