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

Texas Instruments SN74BCT244DW

Name: SN74BCT244DW
Brand: Texas Instruments
SKU: SN74BCT244DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74BCT244DW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74BCT244DW.pdf

Description:: IC BUF NON-INVERT 5.5V 20SOIC

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Product details

Overview

SN74BCT244DW from Texas Instruments is an octal noninverting 3-state buffer/line driver IC designed for memory address and bus driving applications. It features two independent 4-bit sections with active-low output-enable (OE) inputs, 5-V supply operation, ±64 mA low-level output drive, and SOIC-20 package. Used in legacy industrial control backplanes and TTL-compatible data buses.

For engineers reviewing the SN74BCT244DW datasheet, SN74BCT244DW pinout, SN74BCT244DW application, or SN74BCT244DW equivalent, this page delivers verified electrical specs, functional truth table behavior, thermal limits, switching timing under 50-pF load, and direct TI-sourced packaging details - all confirmed for the DW-package variant.

Technical Context

The SN74BCT244DW implements BiCMOS logic architecture to achieve high-speed performance with reduced ICCZ quiescent current. Its P-N-P input structure minimizes DC loading on upstream TTL or CMOS drivers, while 3-state outputs support bidirectional bus contention management.

Each of the two 4-bit sections operates independently: when OE is low, A→Y data passes transparently; when OE is high, Y outputs enter high-impedance state. Input clamping diodes provide ESD protection exceeding 2000 V per MIL-STD-883C Method 3015.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage (VCC)	4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage systems.
Output Drive (IOL)	64 mA - supports direct connection to multiple TTL loads without external buffering.
Propagation Delay (tPLH/tPHL)	0.9–5.0 ns at 5 V/50 pF - enables reliable operation in sub-10-ns bus timing windows.
3-State Enable/Disable Time (tPZL/tPHZ)	2.0–8.9 ns - guarantees clean bus release and acquisition during dynamic bus arbitration.
Operating Temperature	0°C to 70°C - qualified for commercial-grade embedded and industrial control environments.
Input Voltage Range (VI)	−0.5 V to 7 V - accommodates transient overshoot and undershoot without latch-up risk.
ICCZ Quiescent Current	4–10 mA - significantly lower than bipolar-only equivalents, reducing system power overhead.

Pinout & Package

SN74BCT244DW uses a 20-pin SOIC (DW) package, 7.5 mm wide, 2.65 mm max height, 1.27 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable controls Section 1 and Section 2 independently; asserts high-Z on respective Y outputs.
2–5, 18–15	1A1–1A4, 2A1–2A4	Noninverting input terminals for each 4-bit section; accept TTL/CMOS logic levels.
11–14, 7–4	1Y1–1Y4, 2Y1–2Y4	3-state buffered outputs; sink up to 64 mA or source −15 mA under defined conditions.
10, 20	GND, VCC	Power reference and supply pins; require local 0.1-µF ceramic decoupling per datasheet layout guidance.

Key Features

Feature	Design Value
BiCMOS process technology	Reduces ICCZ by >50% vs. legacy bipolar BCT, lowering static power in always-on bus interfaces.
P-N-P input stage	Minimizes input current draw (<1 mA at VI = 0.5 V), easing drive requirements from microcontroller GPIOs.
ESD protection >2000 V	Meets MIL-STD-883C Method 3015 - eliminates need for external TVS on board-level I/O traces.
Independent dual 4-bit sections	Enables asymmetric bus partitioning: e.g., address vs. data lanes controlled by separate OE signals.
SOIC-20 footprint	Standardized land pattern (IPC-7351 compliant) supports automated assembly and rework with common stencil designs.

Applications

Memory Address Buffering	Legacy Bus Transceiver Interface
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs; enables time-multiplexed access across memory banks. Use Value: 64 mA drive strength ensures full TTL fanout (up to 10 LS-TTL loads) without signal degradation over 10-cm PCB traces.	Use Scenario: Interfacing ISA-bus peripherals with modern controller logic in retro-computing hardware restoration. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling read/write handshaking between legacy expansion cards and host logic. Use Value: Sub-5-ns propagation delay and <9-ns 3-state transition meet ISA timing budgets for 8-MHz synchronous transfers.
Industrial Backplane Signal Conditioning	TTL-Level Clock Distribution
Use Scenario: Re-driving noisy or attenuated control signals across a 200-mm DIN-rail-mounted PLC backplane. IC Role / Device Role / Timing Role: Noise-immune buffer regenerating logic edges; GND/VCC decoupling mitigates crosstalk in dense I/O modules. Use Value: −0.5 V to 7 V input range tolerates ±0.5 V ground offset between modules; 2000-V ESD rating prevents field failures.	Use Scenario: Distributing a 5-MHz system clock to four synchronous peripheral controllers with matched skew. IC Role / Device Role / Timing Role: Low-skew fanout buffer ensuring simultaneous edge arrival at downstream devices. Use Value: Matched tPLH/tPHL (±0.5 ns typical) and symmetrical rise/fall times minimize clock jitter accumulation across branches.

Memory Address Buffering

Legacy Bus Transceiver Interface

Use Scenario: Driving 16-bit address lines from a microprocessor to multiple SRAM chips on a shared bus.

IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs; enables time-multiplexed access across memory banks.

Use Value: 64 mA drive strength ensures full TTL fanout (up to 10 LS-TTL loads) without signal degradation over 10-cm PCB traces.

Use Scenario: Interfacing ISA-bus peripherals with modern controller logic in retro-computing hardware restoration.

IC Role / Device Role / Timing Role: Bidirectional bus driver enabling read/write handshaking between legacy expansion cards and host logic.

Use Value: Sub-5-ns propagation delay and <9-ns 3-state transition meet ISA timing budgets for 8-MHz synchronous transfers.

Industrial Backplane Signal Conditioning

TTL-Level Clock Distribution

Use Scenario: Re-driving noisy or attenuated control signals across a 200-mm DIN-rail-mounted PLC backplane.

IC Role / Device Role / Timing Role: Noise-immune buffer regenerating logic edges; GND/VCC decoupling mitigates crosstalk in dense I/O modules.

Use Value: −0.5 V to 7 V input range tolerates ±0.5 V ground offset between modules; 2000-V ESD rating prevents field failures.

Use Scenario: Distributing a 5-MHz system clock to four synchronous peripheral controllers with matched skew.

IC Role / Device Role / Timing Role: Low-skew fanout buffer ensuring simultaneous edge arrival at downstream devices.

Use Value: Matched tPLH/tPHL (±0.5 ns typical) and symmetrical rise/fall times minimize clock jitter accumulation across branches.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS244N	Bipolar TTL process; higher ICCZ (30 mA), slower tPLH (15 ns), no ESD rating.	Limited to low-speed, low-density boards where power and ESD are not critical.	Choose only if legacy LS-TTL compatibility is mandatory and speed/power constraints allow.
SN74AHCT244PW	CMOS-based; 4.5–5.5 V compatible, lower ICC (4 µA), but only 8 mA IOL drive.	Suitable for low-power microcontroller I/O expansion, not high-fanout bus driving.	Select when interfacing with 3.3-V logic or battery-powered systems; avoid for TTL-load bus termination.

Compared with SN74BCT244DW, SN74LS244N trades speed and ESD robustness for broader legacy TTL interoperability, while SN74AHCT244PW offers ultra-low static power at the cost of drive capability - making SN74BCT244DW the optimal choice for 5-V bus buffering requiring both speed and drive strength.

Availability

SN74BCT244DW is available at Aetrix Electronics and suitable for industrial control backplanes, legacy computer bus interfaces, and memory subsystem design requiring stable component supply across long-lifecycle programs.

Supply support for SN74BCT244DW 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 SN74BCT244DW belongs to TI's legacy BCT logic family, engineered specifically to bridge performance gaps between standard TTL and advanced CMOS in memory and bus interface applications during the 1990s system design era.

FAQ

What is the maximum operating temperature range for the SN74BCT244DW?

The SN74BCT244DW is characterized for operation from 0°C to 70°C, per its commercial-grade qualification. This range is explicitly defined in the "recommended operating conditions" table of the SCBS006E datasheet and applies strictly to the DW-package variant. Operation outside this range may result in parametric shift or functional failure.

Does the SN74BCT244DW support 3.3-V input logic levels?

Yes, the SN74BCT244DW accepts 3.3-V logic-high inputs reliably: its VIH threshold is 2.0 V minimum at VCC = 4.5 V, and input voltage range extends to 7 V. However, it remains a 5-V supply device - outputs swing rail-to-rail at 5 V and are not 3.3-V tolerant when driven high.

Is the SN74BCT244DW pin-compatible with the SN74LS244?

No, the SN74BCT244DW is not pin-compatible with SN74LS244. While both are 20-pin octal buffers, the SN74BCT244DW uses a different pinout: OE inputs are on pins 1 and 19, whereas SN74LS244 places them on pins 1 and 19 only in the N-package variant - but functional mapping and internal section organization differ. Always verify against respective package drawings before substitution.

What is the recommended decoupling for the SN74BCT244DW?

Texas Instruments specifies a 0.1-µF ceramic capacitor placed as close as possible between VCC (pin 20) and GND (pin 10) for the SN74BCT244DW. This value is validated in the "example board layout" section of the DW package drawing and is required to suppress switching noise and maintain stable 3-state transitions under 64-mA load transients.

Can the SN74BCT244DW drive a 50-pF bus capacitance within timing specifications?

Yes - the SN74BCT244DW's switching characteristics are explicitly tested at CL = 50 pF, R1 = R2 = 500 Ω, and TA = 25°C. Its tPLH/tPHL values (0.9–5.0 ns) and tPZL/tPHZ (2.0–8.9 ns) are guaranteed under those exact conditions, confirming suitability for standard digital bus loading in industrial backplane designs.

SN74BCT244DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74BCT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 15mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

SN74BCT244DW FAQ

1.How can I place an order for SN74BCT244DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74BCT244DW 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 SN74BCT244DW reliable?

The price and inventory of SN74BCT244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT244DW is usually 5 days.

3.What payment methods are accepted for SN74BCT244DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT244DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74BCT244DW?

SN74BCT244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74BCT244DW 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 SN74BCT244DW?

For technical support, including SN74BCT244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT244DW requirements.

6.How does Aetrix verify that SN74BCT244DW is sourced from the original manufacturer or authorized distributors?

All SN74BCT244DW 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 SN74BCT244DW meets industry standards.

7.What is the process for return or replacement of SN74BCT244DW?

All SN74BCT244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT244DW, 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 SN74BCT244DW part is unused and in its original packaging.

Return procedure for SN74BCT244DW:

1.Submit a request within 90 days.

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

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