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HEF40106BT

Hex inverting Schmitt trigger, 3-15V, hysteresis, SOIC-14, CMOS 4000B, wave shaping

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Manufacturer Part：

HEF40106BT

Package：

SOIC-14 (8.65 x 3.90 x 1.50 mm)

Description

Product Overview

The HEF40106BT from Nexperia is a hex inverting Schmitt trigger in a SOIC-14 package. Part of the HEF4000B CMOS logic family, it provides six independent Schmitt-trigger inverters for wave shaping, noise immunity, and oscillator applications from 3V to 15V supply.

Key Specifications

Function	Hex inverting Schmitt trigger
Supply Voltage	3 V to 15 V
Propagation Delay	60 ns (typ at 15V)
Hysteresis (VH)	0.9V typ (at 5V), 2.0V typ (at 10V)
Output Current	+/-3.4 mA (min at 5V)
Operating Temperature	-40C to +125C

Features

Six independent Schmitt-trigger inverters in one package
Wide 3V to 15V supply voltage range for flexible design
Schmitt trigger hysteresis for high noise immunity
Square up slowly changing waveforms for clean logic edges
CMOS low power dissipation with 1uA max quiescent current
Input clamp diodes for overvoltage interface protection

Applications

Waveform squaring and pulse shaping circuits
Astable and monostable multivibrator oscillators
Noisy signal conditioning and debounce circuits
Level translation and signal conditioning in digital systems

Product Introduction:HEF40106BT Product Introduction

The HEF40106BT from Nexperia is a hex inverting Schmitt trigger in a SOIC-14 package, belonging to the HEF4000B CMOS logic family. The device contains six independent inverting buffers, each with Schmitt-trigger input discrimination. The Schmitt trigger action provides different switching thresholds for positive-going and negative-going input signals, creating hysteresis that significantly improves noise immunity compared to standard inverters. The hysteresis voltage is typically 0.9V at 5V supply and 2.0V at 10V supply. This makes the HEF40106BT ideal for squaring slowly changing or noisy input waveforms into clean digital output signals. The device operates from 3V to 15V supply with CMOS low power dissipation and 1uA maximum quiescent current. Input clamp diodes enable interfacing with voltages exceeding VDD when used with current-limiting resistors. The 60ns typical propagation delay at 15V supports moderate-speed logic applications. The device is specified from -40C to +125C and complies with JEDEC standard JESD 13-B.

Working Principle:HEF40106BT Working Principle

The HEF40106BT uses CMOS Schmitt trigger inverters with hysteresis. (1) Schmitt Trigger: Each inverter has two different threshold voltages: VT+ (positive-going threshold) and VT- (negative-going threshold). When the input rises above VT+, the output switches low. When the input falls below VT-, the output switches high. The difference between VT+ and VT- is the hysteresis voltage VH. (2) Hysteresis Benefit: The hysteresis creates a dead band where input noise cannot cause multiple output transitions. For a slowly rising input with noise, the output switches only once when the input crosses VT+, and does not switch back until the input falls below VT-. This is essential for debouncing mechanical switches and conditioning noisy sensor signals. (3) Oscillator: Connecting the output back to the input through an RC network creates a simple astable oscillator. The capacitor charges through the resistor until the input reaches VT+, then the output switches low and the capacitor discharges until the input reaches VT-, creating continuous oscillation. The frequency is determined by the RC time constant and the hysteresis values. (4) CMOS Output: The complementary CMOS output stage provides rail-to-rail output swing with symmetrical source and sink current capability of +/-3.4mA minimum at 5V.

Pin Description:HEF40106BT Pin Definition and Functions

Pin	Name	Type	Function
1	1A	Input	Inverter 1 input (Schmitt)
2	1Y	Output	Inverter 1 output
3	2A	Input	Inverter 2 input (Schmitt)
4	2Y	Output	Inverter 2 output
5	3A	Input	Inverter 3 input (Schmitt)
6	3Y	Output	Inverter 3 output
7	VSS	Ground	Ground (0V)
8	4Y	Output	Inverter 4 output
9	4A	Input	Inverter 4 input (Schmitt)
10	5Y	Output	Inverter 5 output
11	5A	Input	Inverter 5 input (Schmitt)
12	6Y	Output	Inverter 6 output
13	6A	Input	Inverter 6 input (Schmitt)
14	VDD	Power	Supply voltage (3-15V)

Application Scenarios:In which products and applications isHEF40106BT used

Waveform squaring and pulse shaping circuits with Schmitt hysteresis
Astable multivibrator oscillators using single RC feedback network
Noisy signal conditioning and mechanical switch debounce circuits
Level translation and signal conditioning in 3-15V digital systems

Alternative Models:What chips are recommended as replacements for HEF40106BT

Manufacturer	Part Number	Package	Notes
TI	CD40106BE	DIP-14	Through-hole equivalent
onsemi	MC74HC14ADR2G	SOIC-14	HC family, 2-6V, faster
TI	SN74HC14DR	SOIC-14	HC family, 2-6V
Nexperia	74LVC14AD	SOIC-14	LVC family, 1.65-3.6V