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SN7407DR

Hex buffer/driver, open-collector, 30 V / 30 mA outputs, TTL, SOIC-14

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Manufacturer Part：

SN7407DR

Package：

SOIC-14 (8.65 x 3.91 mm)

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Description

Product Overview

The SN7407DR from Texas Instruments is a hex buffer/driver with open-collector high-voltage outputs in a 14-pin SOIC package. Functionally identical to the 74LS07 but with standard TTL input thresholds, each of the six independent buffers can sink up to 30 mA and withstand output voltages up to 30 V for interfacing low-voltage logic to higher-voltage loads.

Key Specifications

Number of Channels 6 (Hex)
Output Type Open-Collector
Max Output Voltage 30 V
Max Sink Current per Output 30 mA
Input Voltage (High) 2 V min
Input Voltage (Low) 0.8 V max
Propagation Delay 10 ns typical
Operating Temperature 0°C to 70°C

Features

  • Six independent buffer/driver gates
  • Open-collector outputs for wired-OR applications
  • High-voltage output capability: up to 30 V
  • High sink current: 30 mA per output
  • Standard TTL input compatibility
  • Diode-clamped inputs minimize ringing
  • Ideal for LED, relay, and lamp drivers

Applications

  • LED and indicator lamp drivers
  • Relay and solenoid drivers
  • TTL-to-high-voltage level shifting
  • Wired-OR bus interfacing

The SN7407DR from Texas Instruments is a hex buffer/driver with open-collector high-voltage outputs based on the standard 7400 TTL family. Each of the six independent non-inverting buffers features an open-collector output capable of sinking up to 30 mA and withstanding voltages up to 30 V. This makes the device an effective interface between low-voltage TTL logic and higher-voltage external circuits such as LEDs, relays, and indicator lamps. The open-collector output configuration supports wired-OR connections where multiple device outputs share a common pull-up resistor to implement distributed logic functions. Input clamp diodes protect against negative voltage excursions from transmission line ringing. Compared to the LS variant (74LS07), the standard TTL version offers slightly faster propagation delay at the cost of higher power consumption. The 14-pin SOIC package is compatible with standard surface-mount assembly processes.

The SN7407DR operates as six independent non-inverting buffer/driver gates with open-collector outputs: (1) The input stage uses standard TTL circuitry with multi-emitter NPN transistors and input clamp diodes. The diodes conduct when input voltages go below ground, clamping negative undershoot and protecting the internal circuitry. Standard TTL input thresholds (2 V high, 0.8 V low) provide compatibility with 5 V logic families. (2) The internal TTL gate stage performs the non-inverting buffer function with a totem-pole driver that controls the output transistor. The 10 ns typical propagation delay provides faster response than LS-TTL variants. (3) The output stage uses an open-collector NPN transistor. When the input is high, the output transistor saturates, pulling the output low with up to 30 mA sink current. When the input is low, the output transistor turns off, leaving the output at high impedance, allowing an external pull-up resistor to raise the output to any voltage up to 30 V. This enables level-shifting and wired-OR logic configurations.

Pin No. Pin Name Function
1 1A Input for buffer 1
2 1Y Open-collector output for buffer 1
3 2A Input for buffer 2
4 2Y Open-collector output for buffer 2
5 3A Input for buffer 3
6 3Y Open-collector output for buffer 3
7 GND Ground
8 4Y Open-collector output for buffer 4
9 4A Input for buffer 4
10 5Y Open-collector output for buffer 5
11 5A Input for buffer 5
12 6Y Open-collector output for buffer 6
13 6A Input for buffer 6
14 VCC Supply voltage (5 V typical)
  • Driving 12 V or 24 V LED indicators from 5 V TTL logic where the 30 V output rating and 30 mA sink current provide direct interface capability
  • Relay and solenoid driver circuits where open-collector outputs switch inductive loads through external flyback protection diodes
  • TTL-to-high-voltage level shifting in industrial control systems where 5 V logic must drive 24 V or 28 V bus signals through pull-up resistors
  • Wired-OR interrupt or status line multiplexing where multiple open-collector outputs share a common pull-up for distributed fault reporting
Model Brand Output Max Vout Isink
SN74LS07DR TI Open-Collector 30 V 30 mA
SN74LS17DR TI Open-Collector 15 V 30 mA
ULN2003AD TI Darlington OC 50 V 500 mA
MC1413BDG onsemi Darlington OC 50 V 500 mA
SN74LVC07APWR TI Open-Drain 5.5 V 24 mA
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