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HEF4071BT

Quad 2-input OR gate, 4000B CMOS, 3-15V, SOIC-14, 20ns, clamp diodes, ESD 2kV

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Manufacturer Part：

HEF4071BT

Package：

SOIC-14 (8.65 x 3.90 x 1.50 mm, SOT108-1)

Description

Product Overview

The HEF4071BT from Nexperia is a quad 2-input OR gate in a SOIC-14 package. Part of the 4000B CMOS logic family, it operates from 3V to 15V with high noise immunity and low power dissipation, suitable for general-purpose logic applications.

Key Specifications

Logic Function	Quad 2-input OR gate
Supply Voltage	3.0 V to 15 V
Propagation Delay	20 ns typical at 15V
Output Current	+/-2.4 mA at 15V
Input Clamp Diodes	Yes (enables current-limiting resistors)
ESD Protection	HBM > 2000V, CDM > 1000V
Operating Temperature	-40C to +125C

Features

Quad 2-input OR gate in industry-standard SOIC-14 package
3V to 15V wide supply voltage range for versatile logic designs
CMOS low power dissipation with high noise immunity
Input clamp diodes allow current-limiting resistors for over-voltage interfacing
Standardized symmetrical output characteristics per JEDEC JESD-13B
ESD protection exceeding 2000V HBM and 1000V CDM

Applications

General-purpose logic OR function in CMOS systems
Signal combining and logic consolidation at 3-15V
Industrial control logic with high noise immunity
Communication equipment logic gating

Product Introduction:HEF4071BT Product Introduction

The HEF4071BT from Nexperia is a quad 2-input OR gate belonging to the 4000B CMOS logic family in a SOIC-14 (SOT108-1) package. The device contains four independent 2-input OR gates, each implementing the Boolean function Y = A + B. The wide 3V to 15V supply voltage range makes the device suitable for a variety of logic system voltage levels, from low-voltage 3V battery-powered systems to 15V industrial logic. The CMOS construction provides low quiescent power dissipation and high noise immunity compared to bipolar TTL logic families. Input clamp diodes on all inputs enable the use of current-limiting resistors to interface input signals that exceed the supply voltage, providing flexibility in mixed-voltage system designs. The standardized symmetrical output characteristics ensure consistent drive capability in both high and low output states. ESD protection exceeds 2000V HBM and 1000V CDM for robust handling in manufacturing environments. The device complies with JEDEC standard JESD-13B for 4000B series logic specifications.

Working Principle:HEF4071BT Working Principle

The HEF4071BT implements four independent CMOS OR gates. (1) OR Gate Logic: Each gate performs the Boolean OR function Y = A + B. The output is HIGH when either or both inputs are HIGH, and LOW only when both inputs are LOW. (2) CMOS Implementation: Each OR gate is constructed using complementary N-channel and P-channel MOSFETs. The P-channel devices connect the output to VDD when the output should be HIGH, and the N-channel devices connect the output to VSS when the output should be LOW. This complementary structure provides rail-to-rail output swing and low static power dissipation. (3) Input Clamp Diodes: Each input has clamp diodes connected to VDD and VSS. If the input voltage exceeds VDD or goes below VSS, the clamp diodes conduct, limiting the voltage excursion. External current-limiting resistors can be used to safely interface signals above VDD, allowing voltage level translation. (4) Noise Immunity: The CMOS switching thresholds are approximately 50% of VDD, providing high noise margin at both logic levels. The noise margin increases with supply voltage, making the device especially robust in higher-voltage industrial applications.

Pin Description:HEF4071BT Pin Definition and Functions

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

Application Scenarios:In which products and applications isHEF4071BT used

General-purpose logic OR function in CMOS systems at 3-15V supply
Signal combining and logic consolidation with high noise immunity
Industrial control logic with clamp diode over-voltage protection
Communication equipment logic gating in SOIC-14 standard footprint

Alternative Models:What chips are recommended as replacements for HEF4071BT

Manufacturer	Part Number	Package	Notes
TI	CD4071BM96	SOIC-14	TI brand equivalent
onsemi	MC14071BDG	SOIC-14	onsemi brand equivalent
Nexperia	HEF4071BT-Q100	SOIC-14	Automotive grade
TI	SN74HC32DR	SOIC-14	HC version, 2-6V, faster