Texas Instruments SN74LS07D

Overview

SN74LS07D from Texas Instruments is a hex buffer/driver IC with six independent open-collector outputs, designed for level translation between TTL and higher-voltage circuits (up to 30 V), delivering up to 40 mA sink current per channel with 12 ns typical propagation delay and 5 V supply operation. It is used in legacy industrial control I/O interfacing and high-voltage indicator driving.

For engineers reviewing the SN74LS07D datasheet, SN74LS07D pinout, SN74LS07D application, or SN74LS07D equivalent, key selection criteria include open-collector output voltage rating (30 V), sink-current capability (40 mA), TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), SOIC-14 package footprint, and compatibility with mixed-voltage system interfacing where 5 V logic must drive 12–24 V loads.

Technical Context

The SN74LS07D implements six identical open-collector buffer stages, each accepting standard LS-TTL input levels and sinking current into external pull-up networks. Its inputs are diode-clamped to suppress transmission-line ringing and support overvoltage tolerance up to 5.25 V.

Each output operates as a grounded switch capable of sinking up to 40 mA at VO ≤ 0.7 V while sustaining up to 30 V on the collector side. The device requires only a single 5 V supply (4.75–5.25 V) and draws 14–45 mA quiescent current depending on output state.

Key Specifications

Pinout & Package

SN74LS07D is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package measuring 8.65 mm × 3.90 mm with 1.27 mm lead pitch and 1.75 mm maximum height. The package is RoHS-compliant, NIPDAU lead-finished, and rated MSL Level-1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex open-collector buffer applications.

Compared with SN74LS06D, SN74LS07D offers identical functionality and interchangeability; compared with 74HC07PW, SN74LS07D provides critical 30 V output tolerance and 40 mA sink current essential for industrial relay and indicator applications where the CMOS variant cannot substitute.

Availability

SN74LS07D is available at Aetrix Electronics and suitable for industrial control I/O, legacy audio equipment interface, SSD power sequencing, embedded PDA peripheral control, and high-voltage indicator driving requiring stable component supply across long-lifecycle programs.

Supply support for SN74LS07D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LS07D belongs to TI's legacy 74LS logic family, engineered for robust TTL-compatible interfacing in mixed-voltage systems where reliable high-sink-current drive and 30 V output tolerance are required.

FAQ

What is the maximum output voltage rating for SN74LS07D?

The SN74LS07D has a maximum output voltage rating of 30 V, meaning each open-collector output can safely withstand up to 30 V when in the off (high-impedance) state. This rating is explicitly defined in the Absolute Maximum Ratings table and enables direct interface with 12 V and 24 V industrial control circuits without additional protection components. Exceeding 30 V risks permanent damage to the SN74LS07D.

Can SN74LS07D drive LEDs directly?

Yes, SN74LS07D can drive LEDs directly when configured with an appropriate external current-limiting resistor connected between the LED anode and the positive supply rail (e.g., 5 V, 12 V, or 24 V). Each output sinks up to 40 mA, allowing bright illumination of standard indicator LEDs. The SN74LS07D's 30 V output rating ensures safe operation even with higher supply voltages, provided the total current per channel remains within specification.

Is SN74LS07D compatible with 3.3 V logic inputs?

Yes, SN74LS07D accepts 3.3 V logic inputs reliably. Its input structure includes clamping diodes and is rated for input voltages up to 5.25 V, making it tolerant of 3.3 V LVTTL signals. The VIH (minimum high-level input voltage) is 2.0 V and VIL (maximum low-level input voltage) is 0.8 V under recommended conditions, ensuring clean recognition of 3.3 V logic levels. No level-shifter is needed when interfacing with 3.3 V microcontrollers or FPGAs.

What is the propagation delay of SN74LS07D?

The SN74LS07D exhibits a typical propagation delay of 12 ns, with guaranteed minimum and maximum values of 6 ns and 30 ns respectively (tPLH and tPHL) under standard test conditions (VCC = 5 V, TA = 25°C, RL = 110 Ω, CL = 15 pF). This delay is consistent across all six channels and supports reliable operation in systems with clock frequencies up to approximately 30 MHz, matching standard LS-TTL timing budgets.

Does SN74LS07D require external pull-up resistors on its outputs?

Yes, SN74LS07D requires external pull-up resistors on all open-collector outputs to establish a defined high logic level when the output is inactive. Without a pull-up, the output floats and cannot drive a high signal. Typical values range from 1 kΩ (for fast switching with higher current) to 10 kΩ (for low-power applications), selected based on load voltage, speed requirements, and sink current limits. The SN74LS07D itself does not contain internal pull-ups.