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

onsemi SN74LS368AN

Name: SN74LS368AN
Brand: onsemi
SKU: SN74LS368AN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LS368AN

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: SN74LS368AN.pdf

Description:: IC BUFFER INVERT 5.25V 16DIP

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Product details

Overview

SN74LS368AN 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 two independent 4-bit sections (A/B), each with active-low output-enable (OE) control, 35 mA sink capability per output, and operates across 0°C to 70°C. It is commonly used in microprocessor address/data bus buffering and memory interface isolation.

For engineers reviewing the SN74LS368AN datasheet, pinout, applications, or equivalent options, this device requires attention to its dual-section enable logic, guaranteed 35 mA sink current per output, TTL-compatible input thresholds, and PDIP-16 package thermal limitations in sustained high-drive scenarios.

Technical Context

The SN74LS368AN implements two identical 4-bit inverting buffer sections, each with separate active-low output-enable inputs (1OE, 2OE). Each section drives four outputs that are inverted relative to their inputs and enter high-impedance state when OE is high. Input thresholds meet standard TTL specifications (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), and output drive strength is specified at 35 mA sink (I_OL) and –0.4 mA source (I_OH) under V_CC = 5 V.

Propagation delay is characterized at t_PLH/t_PHL = 15 ns max (typical 10 ns) under load conditions of R_L = 400 Ω to V_CC and C_L = 15 pF. The device uses bipolar Schottky TTL process technology and is not designed for hot-swap or live-insertion applications due to lack of I_OFF or power-up 3-state guarantees.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	LS-TTL - low-power Schottky, compatible with standard TTL voltage levels and drive requirements.
Function	Dual 4-bit inverting line driver with independent 3-state control - enables bidirectional bus management using two separate enable signals.
Output Drive (I_OL)	35 mA per output - sufficient to drive multiple TTL loads or terminate unterminated stubs in short-bus configurations.
Propagation Delay	15 ns max (V_CC = 5 V, T_A = 25°C, R_L = 400 Ω, C_L = 15 pF) - supports reliable operation up to ~30 MHz clocked bus cycles.
Operating Temperature	0°C to 70°C - commercial-grade rating suitable for industrial control panels and non-military embedded systems.
Supply Voltage	4.75 V to 5.25 V - tight tolerance ensures stable noise margins and predictable switching thresholds in regulated 5 V rails.
Package	PDIP-16 (N) - through-hole mounting with 0.3-inch width, compatible with legacy PCB assembly and manual prototyping.

Pinout & Package

SN74LS368AN is supplied in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and standard 0.1-inch pin pitch. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.

Pin/Terminal	Circuit Role	Design Meaning
1	1Y4 (Output)	Inverted output of first section, bit 4 - sinks up to 35 mA when enabled and driven low by internal logic.
2	1Y3	Inverted output of first section, bit 3 - shares same 1OE control and electrical characteristics as other Y outputs.
3	1Y2	Inverted output of first section, bit 2 - electrically identical to pins 1–4; all four outputs go high-impedance simultaneously when 1OE = HIGH.
4	1Y1	Inverted output of first section, bit 1 - provides buffered, inverted signal path from corresponding A-inputs.
5	1A1 (Input)	Non-inverting input to first section, bit 1 - drives internal inverter stage; TTL-compatible threshold (V_IH ≥ 2.0 V).
6	1A2	Non-inverting input to first section, bit 2 - matches pin 5 in timing and loading behavior.
7	1A3	Non-inverting input to first section, bit 3 - forms half of 4-bit input group for section 1.
8	GND	Power ground reference - must be connected to system common plane; decoupling capacitor recommended near pin.
9	2A1	Non-inverting input to second section, bit 1 - electrically isolated from section 1; enables independent data channel handling.
10	2A2	Non-inverting input to second section, bit 2 - supports parallel 4-bit data flow distinct from section 1.
11	2A3	Non-inverting input to second section, bit 3 - completes lower nibble of second input group.
12	2A4	Non-inverting input to second section, bit 4 - allows full 4-bit parallel input on second channel.
13	2Y1	Inverted output of second section, bit 1 - controlled by 2OE; high-impedance when 2OE = HIGH.
14	2Y2	Inverted output of second section, bit 2 - matches pin 13 in drive strength and timing.
15	2Y3	Inverted output of second section, bit 3 - shares same enable and output structure as pins 13–16.
16	V_CC	+5 V supply - must be bypassed with 0.1 µF ceramic capacitor between pins 16 and 8 for stable operation.

Key Features

Feature	Design Value
Dual independent 4-bit sections	Enables simultaneous control of two separate 4-bit data paths (e.g., address vs. data bus segments) without cross-talk.
Active-low 3-state enable (1OE, 2OE)	Allows precise timing control over bus release; outputs enter high-Z only when respective OE is HIGH, preventing contention.
35 mA output sink capability	Supports direct driving of up to 10 standard TTL inputs or termination of short stubs without external buffers.
LS-TTL compatibility	Guarantees interoperability with legacy 74LS, 74S, and 74F families in mixed-logic designs without level-shifting.
PDIP-16 package with 0.3" width	Facilitates hand-soldering, socket-based testing, and compatibility with vintage prototyping platforms and repair workflows.

Applications

Microprocessor Bus Buffering	Memory Address Latching
Use Scenario: Isolating and driving microprocessor address lines to multiple memory chips while preventing bus contention during DMA cycles. IC Role / Device Role / Timing Role: SN74LS368AN acts as a bidirectional address bus driver, with one section enabling address output during read/write and the other held high-Z during refresh. Use Value: Eliminates need for discrete pull-up resistors and reduces propagation delay versus open-collector alternatives, improving timing margin in 8-bit systems.	Use Scenario: Driving decoded chip-select signals from a 74LS138 to multiple RAM/ROM devices in an 8085-based system. IC Role / Device Role / Timing Role: SN74LS368AN buffers and inverts select outputs, ensuring clean transitions and adequate fanout for multiple IC enables. Use Value: Provides guaranteed 35 mA sink per output to reliably activate low-active chip selects without signal degradation across PCB traces.
Industrial I/O Expansion	Legacy Test Equipment Interface
Use Scenario: Interfacing PLC output modules to field sensors requiring inverted logic polarity and bus-isolated drive capability. IC Role / Device Role / Timing Role: SN74LS368AN serves as a programmable polarity inverter and level translator between controller logic and sensor-side circuitry. Use Value: Enables software-configurable signal inversion via OE control, reducing firmware complexity and eliminating external inverters.	Use Scenario: Replacing failed drivers in vintage oscilloscopes or logic analyzers where original 74LS368 parts are no longer available. IC Role / Device Role / Timing Role: SN74LS368AN replicates exact timing, drive strength, and pinout of original design, supporting drop-in replacement in calibrated instruments. Use Value: Maintains factory-calibrated timing margins and signal integrity due to identical LS-TTL propagation delay and output impedance.

Microprocessor Bus Buffering

Memory Address Latching

Use Scenario: Isolating and driving microprocessor address lines to multiple memory chips while preventing bus contention during DMA cycles.

IC Role / Device Role / Timing Role: SN74LS368AN acts as a bidirectional address bus driver, with one section enabling address output during read/write and the other held high-Z during refresh.

Use Value: Eliminates need for discrete pull-up resistors and reduces propagation delay versus open-collector alternatives, improving timing margin in 8-bit systems.

Use Scenario: Driving decoded chip-select signals from a 74LS138 to multiple RAM/ROM devices in an 8085-based system.

IC Role / Device Role / Timing Role: SN74LS368AN buffers and inverts select outputs, ensuring clean transitions and adequate fanout for multiple IC enables.

Use Value: Provides guaranteed 35 mA sink per output to reliably activate low-active chip selects without signal degradation across PCB traces.

Industrial I/O Expansion

Legacy Test Equipment Interface

Use Scenario: Interfacing PLC output modules to field sensors requiring inverted logic polarity and bus-isolated drive capability.

IC Role / Device Role / Timing Role: SN74LS368AN serves as a programmable polarity inverter and level translator between controller logic and sensor-side circuitry.

Use Value: Enables software-configurable signal inversion via OE control, reducing firmware complexity and eliminating external inverters.

Use Scenario: Replacing failed drivers in vintage oscilloscopes or logic analyzers where original 74LS368 parts are no longer available.

IC Role / Device Role / Timing Role: SN74LS368AN replicates exact timing, drive strength, and pinout of original design, supporting drop-in replacement in calibrated instruments.

Use Value: Maintains factory-calibrated timing margins and signal integrity due to identical LS-TTL propagation delay and output impedance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS240N	Octal inverting buffer with dual 4-bit enables (same pinout but different enable assignment: active-high vs. SN74LS368AN's active-low OE).	Requires logic inversion of enable signals; not pin-compatible due to differing OE pin locations (pins 1/19 vs. 1/15).	Select SN74LS240N only if system firmware can accommodate active-high enable polarity and board layout allows rewiring.
SN74LS244N	Octal non-inverting buffer with identical pinout and enable configuration, but lacks inversion function.	Cannot replace SN74LS368AN without adding external inverters on all eight inputs, increasing component count and propagation delay.	Choose SN74LS244N only when signal polarity preservation is required and system design permits added inversion logic.

Compared with SN74LS240N and SN74LS244N, the SN74LS368AN uniquely combines dual-section active-low 3-state control with built-in inversion-making it irreplaceable in legacy bus arbitration schemes where both polarity and precise enable timing are fixed by hardware design.

Availability

SN74LS368AN is available at Aetrix Electronics and suitable for industrial control panels, legacy test equipment refurbishment, and microprocessor-based educational kits requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74LS368AN 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 products for industrial, automotive, and communications markets.

The SN74LS368AN belongs to TI's legacy 74LS logic family, engineered specifically for robust, low-power TTL-compatible interfacing in cost-sensitive, non-automotive embedded systems operating at 5 V.

FAQ

What is the maximum output sink current specification for SN74LS368AN?

The SN74LS368AN is rated for a minimum output sink current (I_OL) of 35 mA per output at V_CC = 5 V and V_OL = 0.5 V. This value is guaranteed across the full commercial temperature range (0°C to 70°C) and ensures reliable driving of multiple TTL inputs or moderate PCB trace loads without external buffering. Exceeding this limit risks output transistor degradation in the SN74LS368AN.

Does SN74LS368AN support hot insertion or live enable/disable sequencing?

No, the SN74LS368AN does not support hot insertion or live enable/disable sequencing. Its outputs do not guarantee high-impedance state during power-up or power-down transitions, and no I_OFF specification is provided. Applying input signals or enabling outputs before V_CC stabilizes may cause undefined states or excessive current in the SN74LS368AN. System-level power sequencing must be implemented externally.

Can SN74LS368AN be used as a direct replacement for SN74LS367AN?

No, SN74LS368AN cannot directly replace SN74LS367AN. While both are dual 4-bit buffers in PDIP-16 packages, SN74LS367AN is non-inverting and shares identical pinout but opposite logic polarity. Substituting SN74LS368AN would invert all eight outputs, breaking functional correctness unless upstream/downstream logic compensates - making it incompatible without redesign of the SN74LS368AN's surrounding circuitry.

What is the recommended decoupling for SN74LS368AN in high-noise industrial environments?

In high-noise industrial environments, TI recommends a minimum 0.1 µF ceramic capacitor placed between V_CC (pin 16) and GND (pin 8) of the SN74LS368AN, with lead length under 5 mm. For systems with rapid bus switching, add a bulk 10 µF tantalum capacitor within 2 inches of the SN74LS368AN's power entry point to suppress low-frequency ripple and maintain stable V_CC during peak current transients.

Is SN74LS368AN RoHS compliant?

Yes, the SN74LS368AN is RoHS compliant, featuring NiPdAu (NIPDAU) lead finish and meeting EU Directive 2011/65/EU requirements. This applies to all currently active production lots shipped by Texas Instruments, as confirmed in TI's official packaging addendum dated July 2026. The SN74LS368AN carries no exemptions and contains no restricted substances above threshold limits.

SN74LS368AN Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LS

Package/Case:: 16-DIP (0.300", 7.62mm)

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:: Through Hole

Supplier Device Package:: 16-PDIP

SN74LS368AN FAQ

1.How can I place an order for SN74LS368AN through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS368AN 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 SN74LS368AN reliable?

The price and inventory of SN74LS368AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS368AN is usually 5 days.

3.What payment methods are accepted for SN74LS368AN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS368AN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS368AN?

SN74LS368AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS368AN 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 SN74LS368AN?

For technical support, including SN74LS368AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS368AN requirements.

6.How does Aetrix verify that SN74LS368AN is sourced from the original manufacturer or authorized distributors?

All SN74LS368AN 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 SN74LS368AN meets industry standards.

7.What is the process for return or replacement of SN74LS368AN?

All SN74LS368AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS368AN, 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 SN74LS368AN part is unused and in its original packaging.

Return procedure for SN74LS368AN:

1.Submit a request within 90 days.

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

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