7437 IC Quad 2-Input NAND Buffer
The IC 7437 integrates four 2-input NAND gates with open-collector outputs inside a standard 14-pin DIP package. Each gate outputs LOW only when both inputs are HIGH. Unlike standard NAND gates, these outputs act like switches to ground, so you can connect them to external voltages (up to 30V) using pull-up resistors.
You can use the 7437 to drive current-demanding components such as motors, relays, buzzers, and lamps. The open-collector design lets the IC handle mixed-voltage environments and implement wired-AND logic by connecting outputs together. Its TTL-compatible inputs accept standard logic levels, which simplifies integration with 7400-series logic systems.
This IC works well in control systems, industrial equipment, and custom electronics where direct output control isn’t enough. Use the 7437 when your circuit needs load control, high-voltage switching, or current sinking.
Key Features
Contains four 2-input NAND gates
Open-collector outputs for external voltage and current control
Supports TTL logic levels (typically 5V)
Interfaces easily with relays, lamps, and motors
Outputs can be pulled up to 30V using resistors
Delivers fast switching speeds and noise immunity
Available in DIP-14 and SOIC-14 packages
Applications
Engineers use the 7437 to drive external loads like relays and solenoids.
It allows logic circuits to output signals at voltages higher than 5V.
Designers apply it in control panels where open-collector outputs offer safe switching.
It works in logic systems that require level shifting between different supply domains.
Developers include it in circuits where current sinking is needed to activate loads.
The IC supports wired-AND logic by connecting multiple outputs to a shared line.
It enables multiple logic outputs to interface with shared high-voltage systems.
Industrial systems use it to trigger alarms, indicators, or control modules.
Hobbyists use it in automation projects requiring high-current switching.
Educational labs use it to demonstrate open-collector and load-driving logic.
Specifications Table
| Parameter | Value |
|---|---|
| Logic Family | TTL (Standard) |
| Number of Gates | 4 |
| Gate Type | NAND with Open-Collector Output |
| Inputs per Gate | 2 |
| Output Type | Open-Collector |
| Max Output Voltage | 30V (with external pull-up) |
| Output Current (Sink) | ~40 mA |
| Logic High Input Voltage | ≥ 2.0V ‘ |
| Logic Low Input Voltage | ≤ 0.8V |
| Supply Voltage (Vcc) | 4.75V to 5.25V |
| Typical Operating Voltage | 5V |
| Propagation Delay | ~10–16 ns |
| Power Dissipation | ~10–12 mW (typical) |
| Operating Temperature Range | 0°C to 70°C |
| Package Type | DIP-14 / SOIC-14 |
| Pin Count | 14 |
