Texas Instruments SN74LS07NS

Overview

SN74LS07NS 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, and operating at 5 V supply with 12 ns typical propagation delay. It serves in interface and load-driving roles in legacy industrial control and display backlight systems.

For engineers reviewing the SN74LS07NS datasheet, SN74LS07NS pinout, SN74LS07NS application, or SN74LS07NS equivalent, key selection considerations include its 30 V output voltage rating, 40 mA sink capability per output, open-collector topology enabling wired-AND/wired-OR logic, compatibility with 5-V TTL inputs, and SO (SOP) 14-pin package footprint.

Technical Context

The SN74LS07NS implements six identical open-collector buffer stages, each accepting standard TTL-level inputs (VIH = 2 V, VIL = 0.8 V) and sinking current into external pull-up networks. Its outputs are not internally connected to VCC - they require external pull-ups to define high-state voltage and drive capability.

This device operates strictly as a non-inverting driver: low input yields low (sinking) output; high input yields high-impedance (Hi-Z) output. It lacks internal logic inversion, latch, or enable functionality - all six channels operate independently with no shared control signals.

Key Specifications

Pinout & Package

SN74LS07NS is housed in a 14-pin Small Outline Package (SO / SOP), measuring 10.30 mm × 5.30 mm, with 1.27 mm lead pitch and gull-wing leads. The package is RoHS-compliant, moisture-sensitivity Level-1 rated, and compatible with standard reflow soldering profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS07NS, SN74LS06N offers identical performance in through-hole form but sacrifices SMT manufacturability and thermal efficiency, while SN74LV07APWR trades high-voltage drive for broader supply flexibility and lower static power - neither is a drop-in replacement due to voltage or packaging mismatch.

Availability

SN74LS07NS is available at Aetrix Electronics and suitable for industrial control panels, legacy display backlight systems, and 5 V–12 V interface modules requiring stable component supply across multi-year production cycles.

Supply support for SN74LS07NS 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 global semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and communications portfolio coverage.

The SN74LS07NS belongs to TI's legacy 74LS logic family, engineered specifically for robust 5 V TTL system interfacing, high-current sinking, and mixed-voltage signal translation in cost-sensitive industrial electronics.

FAQ

What is the maximum voltage that can be applied to the SN74LS07NS outputs?

The SN74LS07NS outputs are rated for up to 30 V when in the off (Hi-Z) state. This specification allows the device to safely interface with 12 V and 24 V loads such as relays, lamps, and MOSFET gates. Exceeding 30 V risks permanent damage to the output transistors. The SN74LS07NS datasheet explicitly states VO = 30 V as the absolute maximum output voltage rating under no-sink conditions.

Can the SN74LS07NS drive multiple TTL inputs simultaneously?

Yes, the SN74LS07NS can drive multiple TTL inputs because each output provides up to 40 mA of sink current, exceeding the 1.6 mA total input current required by ten standard 74LS inputs (0.4 mA per input × 10). Its open-collector architecture allows fan-out scaling via appropriate pull-up resistor selection. The SN74LS07NS datasheet confirms this capability in the "High Sink-Current Capability" feature and electrical characteristics table (IOL = 40 mA).

Is the SN74LS07NS compatible with 3.3 V microcontroller GPIOs?

No, the SN74LS07NS inputs are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V), so they will recognize 3.3 V logic-high signals correctly. However, its outputs cannot directly drive 3.3 V inputs without external pull-up to 3.3 V - the SN74LS07NS itself has no internal level-shifting. When used as a driver, the external pull-up must match the target logic voltage. The SN74LS07NS datasheet notes input compatibility with "2.5-V, 3.3-V (LVTTL), or 5-V (CMOS) devices" but requires external biasing for output voltage translation.

Does the SN74LS07NS have built-in ESD protection?

The SN74LS07NS features basic ESD protection rated at ±2000 V HBM and ±1000 V CDM per JEDEC standards, as documented in its datasheet Section 6.2. This level meets standard manufacturing ESD control requirements but is not sufficient for direct handling without precautions. TI recommends using conductive foam or shorting leads during storage and handling. The SN74LS07NS datasheet explicitly warns: "These devices have limited built-in ESD protection."

What is the thermal resistance (RθJA) of the SN74LS07NS package?

The SN74LS07NS in its SO (NS) package has a junction-to-ambient thermal resistance (RθJA) of 82.8 °C/W, as specified in Table 6.4 of the official Texas Instruments datasheet. This value assumes standard JEDEC 2-layer board conditions. For continuous 40 mA sink operation across all six channels (240 mA total), power dissipation reaches ~140 mW, resulting in a ~12 °C junction rise above ambient - well within safe limits at room temperature. The SN74LS07NS datasheet lists RθJA = 82.8 °C/W under "Thermal Information" for the NS package.