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

Texas Instruments SN74LS466DWR

Name: SN74LS466DWR
Brand: Texas Instruments
SKU: SN74LS466DWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LS466DWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74LS466DWR.pdf

Description:: BUS DRIVER, LS SERIES

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74LS466DWR from Texas Instruments is an octal buffer with 3-state outputs, designed for bidirectional data bus interfacing in TTL systems. It features active-low output-enable (OE̅), non-inverting logic, 20-pin SOIC package, 5 V nominal supply, and supports bus-hold functionality on inputs. Used in legacy industrial control backplanes and memory address latching.

For engineers reviewing the SN74LS466DWR datasheet, SN74LS466DWR pinout, SN74LS466DWR application, or SN74LS466DWR equivalent, key selection criteria include 3-state drive capability, input bus-hold behavior, TTL-compatible voltage thresholds, propagation delay under load, and SOIC-20 thermal and layout constraints.

Technical Context

The SN74LS466DWR implements eight independent non-inverting buffers, each with a dedicated active-low 3-state output enable (OE̅). All outputs enter high-impedance state when OE̅ is high, enabling shared-bus operation without external gating logic.

Input bus-hold circuitry maintains valid logic levels on un-driven inputs, eliminating need for external pull-up/down resistors. Designed for 5-V TTL systems, it meets standard LS family voltage thresholds (V_IL = 0.8 V max, V_IH = 2.0 V min) and drives ±8 mA loads at V_OL/V_OH.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	LS-TTL - ensures compatibility with legacy 74LS system timing and drive strength
Supply Voltage	4.75 V to 5.25 V - requires regulated 5 V rail; no wide-V_CC support
Propagation Delay	25 ns max (t_PLH/t_PHL at V_CC = 5 V, C_L = 15 pF) - defines maximum clock/data rate in synchronous bus designs
Output Drive	−8 mA / +8 mA (I_OH/I_OL) - sufficient to drive one LS load or two standard TTL inputs
Input Bus-Hold	Yes - internal ~100 kΩ feedback resistor holds last valid state; eliminates external biasing
Operating Temp	0 °C to +70 °C - commercial-grade rating; not rated for extended or military temperature ranges

Pinout & Package

SN74LS466DWR is housed in a 20-pin SOIC (DW) package per JEDEC MS-013, 7.6 mm body width, 2.65 mm max height, 1.27 mm lead pitch. Pin 1 marked by beveled corner or notch.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Inputs (A1–A8)	Active-high data inputs; each internally tied to bus-hold circuitry
9, 10, 11, 12, 13, 14, 15, 16	Outputs (Y1–Y8)	Non-inverting 3-state outputs; high-impedance when OE̅ = HIGH
17	GND	Ground reference for all logic and output stages
18	V_CC	+5 V power supply; decoupling capacitor required near pin
19	OE̅	Active-low output enable controlling all eight outputs simultaneously
20	NC	No internal connection; must remain unconnected per TI datasheet

Key Features

Feature	Design Value
Octal 3-state buffering	Enables time-multiplexed sharing of single data bus among multiple peripherals without contention
Integrated bus-hold inputs	Prevents floating inputs during tri-state or power-up; reduces BOM count and PCB area
Matched propagation delays	Ensures simultaneous output assertion across all eight channels for coherent bus timing
TTL-compatible thresholds	Direct interface with 74LS, 74S, and 74F families without level-shifting components
SOIC-20 footprint	Standardized surface-mount package supporting automated assembly and reflow profiles

Applications

Industrial Backplane Interface	Legacy Memory Address Latching
Use Scenario: Isolating CPU address/data lines from multiple peripheral cards in modular PLC chassis. IC Role / Device Role / Timing Role: Bidirectional bus buffer with synchronized 3-state control for slot-select arbitration. Use Value: Prevents signal contention during card hot-swap; bus-hold maintains valid state during slot reset sequences.	Use Scenario: Driving 16-bit address bus to multiple static RAM modules in vintage test equipment. IC Role / Device Role / Timing Role: Non-inverting repeater with controlled output enable for address strobe synchronization. Use Value: Compensates for capacitive loading across long traces; 25 ns delay enables reliable 20 MHz address setup.
Microcontroller I/O Expansion	TTL-Level Serial Data Multiplexing
Use Scenario: Extending GPIO count of 8-bit microcontrollers in HVAC controller boards. IC Role / Device Role / Timing Role: Input-sampling and output-driving buffer with local OE̅ control per subsystem. Use Value: Bus-hold retains last read state during MCU sleep mode; reduces wake-up latency and polling overhead.	Use Scenario: Routing UART TX/RX lines between multiple RS-232 transceivers and a central controller. IC Role / Device Role / Timing Role: Direction-controlled data path selector using OE̅ as channel select signal. Use Value: Eliminates need for discrete analog switches; TTL-level compatibility avoids level translation ICs.

Industrial Backplane Interface

Legacy Memory Address Latching

Use Scenario: Isolating CPU address/data lines from multiple peripheral cards in modular PLC chassis.

IC Role / Device Role / Timing Role: Bidirectional bus buffer with synchronized 3-state control for slot-select arbitration.

Use Value: Prevents signal contention during card hot-swap; bus-hold maintains valid state during slot reset sequences.

Use Scenario: Driving 16-bit address bus to multiple static RAM modules in vintage test equipment.

IC Role / Device Role / Timing Role: Non-inverting repeater with controlled output enable for address strobe synchronization.

Use Value: Compensates for capacitive loading across long traces; 25 ns delay enables reliable 20 MHz address setup.

Microcontroller I/O Expansion

TTL-Level Serial Data Multiplexing

Use Scenario: Extending GPIO count of 8-bit microcontrollers in HVAC controller boards.

IC Role / Device Role / Timing Role: Input-sampling and output-driving buffer with local OE̅ control per subsystem.

Use Value: Bus-hold retains last read state during MCU sleep mode; reduces wake-up latency and polling overhead.

Use Scenario: Routing UART TX/RX lines between multiple RS-232 transceivers and a central controller.

IC Role / Device Role / Timing Role: Direction-controlled data path selector using OE̅ as channel select signal.

Use Value: Eliminates need for discrete analog switches; TTL-level compatibility avoids level translation ICs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS244N	No bus-hold inputs; requires external pull-up/down resistors on unused inputs	Suitable only where inputs are always driven; less robust in partial-bus configurations	Lower cost but increases design complexity and risk of floating-input faults
SN74ALS244DWR	ALS family: faster (12 ns typ), lower power (8 mW), but no bus-hold and stricter V_IH (2.0 V min same, but noise margin reduced)	Better for speed-critical paths; incompatible with marginal TTL fan-out or noisy environments	Preferred for new LS-alike designs needing higher performance; not drop-in for bus-hold-dependent legacy layouts

Compared with SN74LS244N and SN74ALS244DWR, the SN74LS466DWR uniquely combines bus-hold inputs with standard LS drive and timing-critical for maintaining signal integrity in partially populated or intermittently driven legacy bus architectures.

Availability

SN74LS466DWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory subsystems, and microcontroller I/O expansion requiring stable component supply despite end-of-life status.

Supply support for SN74LS466DWR 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 SN74LS466DWR belongs to TI's legacy 74LS logic family, engineered for reliable, low-cost digital interfacing in commercial-grade systems operating at 5 V with strict TTL compatibility requirements.

FAQ

What is the function of Pin 20 (NC) on the SN74LS466DWR?

Pin 20 on the SN74LS466DWR is designated NC (No Connection) and has no internal bond wire or circuit connection. Per Texas Instruments' datasheet SDLS179, this pin must remain unconnected in PCB layout and should not be tied to V_CC, GND, or any other signal. Leaving it floating is electrically safe and required for correct device operation.

Does the SN74LS466DWR support hot-swap or live-insertion on a powered bus?

The SN74LS466DWR is not rated for hot-swap operation. Its 3-state outputs do not include bus-fault protection, current-limiting, or slew-rate control. Inserting SN74LS466DWR into a live 5 V bus may cause transient contention or latch-up. System-level hot-swap requires external current limiting, sequencing, or dedicated hot-swap controllers-not provided by the SN74LS466DWR itself.

Can the SN74LS466DWR replace the SN74LS244 in an existing design?

The SN74LS466DWR can replace the SN74LS244 in most pin-compatible layouts, but requires verification of OE̅ polarity and bus-hold impact. Both use SOIC-20 and share identical pinout, but SN74LS466DWR has active-low OE̅ (same as SN74LS244) and adds bus-hold on inputs-reducing need for external biasing but potentially altering power-up behavior in undriven nets.

What is the maximum capacitive load the SN74LS466DWR can drive reliably?

The SN74LS466DWR is characterized for 15 pF load capacitance in timing specifications (e.g., 25 ns propagation delay). While it can drive higher capacitance (up to ~50 pF) with degraded timing, signal integrity degrades beyond 30 pF due to increased rise/fall times and potential ringing. For >30 pF loads, add series termination or reduce trace length-designs using SN74LS466DWR should verify waveform fidelity at target clock rates.

Is the SN74LS466DWR RoHS compliant?

The SN74LS466DWR is marked OBSOLETE in TI's packaging addendum, and its Eco Plan is listed as "TBD" - meaning TI did not define a Pb-Free or Green conversion plan before discontinuation. Units supplied by Aetrix Electronics are legacy non-RoHS-compliant (lead-containing terminations), consistent with original 1980s manufacturing. RoHS compliance cannot be assumed or certified for SN74LS466DWR.

SN74LS466DWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74LS466DWR FAQ

1.How can I place an order for SN74LS466DWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS466DWR 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 SN74LS466DWR reliable?

The price and inventory of SN74LS466DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS466DWR is usually 5 days.

3.What payment methods are accepted for SN74LS466DWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS466DWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS466DWR?

SN74LS466DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS466DWR 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 SN74LS466DWR?

For technical support, including SN74LS466DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS466DWR requirements.

6.How does Aetrix verify that SN74LS466DWR is sourced from the original manufacturer or authorized distributors?

All SN74LS466DWR 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 SN74LS466DWR meets industry standards.

7.What is the process for return or replacement of SN74LS466DWR?

All SN74LS466DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS466DWR, 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 SN74LS466DWR part is unused and in its original packaging.

Return procedure for SN74LS466DWR:

1.Submit a request within 90 days.

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

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