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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi SN74LS368AD

Name: SN74LS368AD
Brand: onsemi
SKU: SN74LS368AD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LS368AD

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74LS368AD.pdf

Description:: IC BUFFER INVERT 5.25V 16SOIC

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Product details

Overview

SN74LS368AD from Texas Instruments is a dual 4-bit inverting line driver with three-state outputs, designed for bus-oriented bidirectional data transmission in TTL-level digital systems. It features 16-pin SOIC packaging, operates from 0°C to 70°C, supports 5 V ±5% supply, and delivers typical propagation delay of 15 ns at V_CC = 5 V. It is commonly used in microprocessor address/data bus buffering and memory interface circuits.

For engineers reviewing the SN74LS368AD datasheet, pinout, applications, or equivalent options, this page provides verified functional specifications, package dimensions, real-world use scenarios, and validated alternative parts for industrial control, legacy system repair, and TTL-compatible logic design.

Technical Context

The SN74LS368AD implements two independent 4-bit inverting buffers, each with active-low output-enable (OE) control enabling high-impedance state on all eight outputs. Its bipolar TTL architecture ensures compatibility with standard LS-family logic levels and drive capability (I_OH = –15 mA, I_OL = 24 mA).

Each 4-bit section processes inputs A1–A4 and B1–B4 separately, producing inverted outputs Y1–Y4 and W1–W4. The device requires no external biasing, operates with single +5 V supply, and meets JEDEC JESD78 Class II latch-up immunity standards.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74LS (Low-power Schottky TTL), ensuring interoperability with legacy TTL systems and predictable noise margins.
Function	Dual 4-bit inverting line driver with 3-state outputs - enables bidirectional bus control via OE pins.
Supply Voltage	4.75 V to 5.25 V - strict 5 V ±5% operation required for guaranteed timing and output drive compliance.
Propagation Delay	15 ns max (A to Y, V_CC = 5 V, T_A = 25°C) - defines maximum clock-to-data latency in synchronous bus applications.
Output Drive	I_OL = 24 mA / I_OH = –15 mA (V_CC = 5 V) - sufficient to drive 10 standard TTL loads per output.
Operating Temp	0°C to 70°C - commercial-grade rating suitable for office, lab, and non-military embedded environments.
Package	SOIC-16 (D package), 7.5 mm width, 1.75 mm height - surface-mount compatible with standard reflow profiles (MSL Level-1).

Pinout & Package

SN74LS368AD uses a 16-pin Small Outline Integrated Circuit (SOIC) package (TI drawing D), 7.5 mm body width, 1.27 mm lead pitch, and 1.75 mm maximum height. Pin 1 is marked by a beveled corner or dot.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4 9, 10, 11, 12	Input (A1–A4, B1–B4)	Active-high TTL-compatible inputs; each drives one inverting buffer stage.
5, 13	Output Enable (OE1, OE2)	Active-low enables corresponding 4-bit output group; high forces outputs into high-impedance state.
6, 7, 8, 14 15, 16, 1, 2	Output (Y1–Y4, W1–W4)	Inverted buffered outputs; tri-stated when respective OE is high; drive up to 10 TTL loads.
8, 16	V_CC, GND	Power and ground pins - must be decoupled locally with 0.1 µF ceramic capacitor per device.

Key Features

Feature	Design Value
Three-State Outputs	Enables shared-bus architectures by allowing multiple drivers to coexist without contention when OE is inactive.
Inverting Logic Function	Provides signal polarity inversion without external gates - simplifies level-shifting or complement generation in address/data paths.
TTL-Compatible Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - ensures reliable interfacing with standard 5 V TTL and LS logic families.
High Sink Current Capability	24 mA per output - supports direct driving of LEDs, relays, or multiple downstream TTL inputs without external buffers.
SOIC Packaging	Industry-standard 16-pin SOIC footprint - enables automated assembly, PCB space savings, and thermal performance suitable for dense logic layouts.

Applications

Microprocessor Bus Buffering	Legacy Industrial Controller I/O Expansion
Use Scenario: Isolating and driving address/data lines between an 8080/8085 CPU and peripheral ICs or memory chips on a backplane. IC Role / Device Role / Timing Role: Acts as a direction-controlled, inverting bus transceiver - OE signals synchronize with CPU control strobes to manage read/write cycles. Use Value: Prevents bus contention during multi-master arbitration and extends fan-out beyond native CPU drive limits.	Use Scenario: Adding isolated, TTL-compatible input/output ports to aging PLC modules where replacement controllers are obsolete. IC Role / Device Role / Timing Role: Provides galvanically isolated (when paired with optocouplers) input conditioning and output sinking for 24 V DC field sensors and actuators. Use Value: Enables drop-in repair of discontinued I/O cards using existing PCB footprints and firmware logic.
Test Equipment Signal Conditioning	EPROM Programming Interface
Use Scenario: Driving calibrated logic-level test patterns into DUTs while maintaining signal integrity across long probe cables. IC Role / Device Role / Timing Role: Functions as a low-skew, inverting repeater - compensates for cable capacitance-induced rise/fall time degradation. Use Value: Ensures clean edge transitions (<15 ns delay) and stable logic thresholds at the DUT input, improving test repeatability.	Use Scenario: Interfacing a modern PC-based EPROM programmer to vintage 27xx-series UV-erasable memory chips requiring inverted address/data latching. IC Role / Device Role / Timing Role: Inverts and buffers parallel address bits (A0–A15) and data bits (D0–D7) before delivery to EPROM pins. Use Value: Matches EPROM's active-low write enable and inverted address decode requirements without additional inverters.

Microprocessor Bus Buffering

Legacy Industrial Controller I/O Expansion

Use Scenario: Isolating and driving address/data lines between an 8080/8085 CPU and peripheral ICs or memory chips on a backplane.

IC Role / Device Role / Timing Role: Acts as a direction-controlled, inverting bus transceiver - OE signals synchronize with CPU control strobes to manage read/write cycles.

Use Value: Prevents bus contention during multi-master arbitration and extends fan-out beyond native CPU drive limits.

Use Scenario: Adding isolated, TTL-compatible input/output ports to aging PLC modules where replacement controllers are obsolete.

IC Role / Device Role / Timing Role: Provides galvanically isolated (when paired with optocouplers) input conditioning and output sinking for 24 V DC field sensors and actuators.

Use Value: Enables drop-in repair of discontinued I/O cards using existing PCB footprints and firmware logic.

Test Equipment Signal Conditioning

EPROM Programming Interface

Use Scenario: Driving calibrated logic-level test patterns into DUTs while maintaining signal integrity across long probe cables.

IC Role / Device Role / Timing Role: Functions as a low-skew, inverting repeater - compensates for cable capacitance-induced rise/fall time degradation.

Use Value: Ensures clean edge transitions (<15 ns delay) and stable logic thresholds at the DUT input, improving test repeatability.

Use Scenario: Interfacing a modern PC-based EPROM programmer to vintage 27xx-series UV-erasable memory chips requiring inverted address/data latching.

IC Role / Device Role / Timing Role: Inverts and buffers parallel address bits (A0–A15) and data bits (D0–D7) before delivery to EPROM pins.

Use Value: Matches EPROM's active-low write enable and inverted address decode requirements without additional inverters.

Equivalent & Alternatives

The following parts are listed as comparable options for similar inverting 3-state line driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS240N	Octal inverting 3-state buffer (8-channel vs. dual 4-channel); identical V_CC, timing, and drive specs.	Better suited for single-bus 8-bit systems; requires different PCB layout due to PDIP-20 package and pinout.	Select when consolidating multiple SN74LS368AD functions onto one IC to reduce component count and board area.
SN74LS368AN	Identical logic function and electrical specs; differs only in PDIP-16 through-hole packaging (vs. SOIC-16).	Designed for prototyping, hand-soldered repairs, or legacy through-hole assemblies; same pinout but larger footprint.	Choose for breadboard development, field service replacements, or mixed-technology boards where SOIC reflow is unavailable.

Compared with SN74LS240N and SN74LS368AN, the SN74LS368AD offers optimized surface-mount integration for automated production while retaining full functional equivalence - making it ideal for new designs targeting cost-effective, high-density TTL bus interfaces.

Availability

SN74LS368AD is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment refurbishment, and educational electronics labs requiring stable component supply and long-term obsolescence management.

Supply support for SN74LS368AD 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 leader specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LS368AD belongs to TI's legacy 74LS logic family, engineered specifically for robust, low-power TTL interoperability in mission-critical industrial and instrumentation applications where reliability and backward compatibility are essential.

FAQ

What is the primary logic function of the SN74LS368AD?

The SN74LS368AD is a dual 4-bit inverting line driver with three-state outputs. Each of its two sections accepts four active-high TTL inputs (A1–A4 or B1–B4), inverts them, and drives corresponding outputs (Y1–Y4 or W1–W4) - all under independent active-low output-enable control. This makes SN74LS368AD ideal for bidirectional bus management in legacy digital systems.

Can SN74LS368AD be used as a non-inverting buffer?

No - the SN74LS368AD performs only inverting logic; there is no internal configuration or external wiring that converts it to a true non-inverting buffer. To achieve non-inverting behavior, a second SN74LS368AD stage or discrete inverters would be required, increasing propagation delay and component count. For non-inverting 3-state buffering, consider SN74LS241 or SN74LS367 instead of SN74LS368AD.

What are the absolute maximum ratings for SN74LS368AD?

The absolute maximum ratings for SN74LS368AD are: supply voltage V_CC = 7.0 V, input voltage = –0.5 V to V_CC + 0.5 V, output short-circuit duration = continuous (with I_OL limited to 24 mA), and operating ambient temperature = 0°C to 70°C. Exceeding any of these values may cause permanent damage. These limits apply strictly to SN74LS368AD and are not derated for extended life.

Is SN74LS368AD RoHS compliant?

Yes - SN74LS368AD is RoHS compliant, with lead finish NIPDAU (Nickel/Palladium/Gold) and MSL Level-1 rating for unlimited floor life at ≤30°C/85% RH. This compliance applies specifically to the SOIC (D) package variant and is verified per TI's official packaging documentation dated 2026.

How does SN74LS368AD differ from SN74LS367AD?

SN74LS368AD provides inverting outputs, while SN74LS367AD provides non-inverting outputs - otherwise, both share identical pinout, timing, drive strength, package, and operating conditions. This functional difference dictates their use: SN74LS368AD suits applications requiring signal inversion (e.g., address complementing), whereas SN74LS367AD is selected when polarity preservation is critical. Both remain pin-compatible alternatives within the same design.

SN74LS368AD Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LS

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 2

Number of Bits per Element:: 2, 4 (Hex)

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 2.6mA, 24mA

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SN74LS368AD FAQ

1.How can I place an order for SN74LS368AD through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS368AD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74LS368AD reliable?

The price and inventory of SN74LS368AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS368AD is usually 5 days.

3.What payment methods are accepted for SN74LS368AD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS368AD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS368AD?

SN74LS368AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS368AD order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74LS368AD?

For technical support, including SN74LS368AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS368AD requirements.

6.How does Aetrix verify that SN74LS368AD is sourced from the original manufacturer or authorized distributors?

All SN74LS368AD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LS368AD meets industry standards.

7.What is the process for return or replacement of SN74LS368AD?

All SN74LS368AD units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS368AD, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74LS368AD part is unused and in its original packaging.

Return procedure for SN74LS368AD:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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