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

Texas Instruments SN74BCT2240N

Name: SN74BCT2240N
Brand: Texas Instruments
SKU: SN74BCT2240N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74BCT2240N

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-DIP (0.300", 7.62mm)

Datasheet:: SN74BCT2240N.pdf

Description:: IC BUFFER INVERT 5.5V 20DIP

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Product details

Overview

SN74BCT2240N from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus driving in 5-V TTL-compatible systems. It operates from 4.5 V to 5.5 V, features integrated 33-Ω series output resistors, supports ±12 mA output drive, and delivers propagation delays as low as 0.5 ns (t_PLH/t_PHL) at 5 V.

For engineers reviewing the SN74BCT2240N datasheet, SN74BCT2240N pinout, SN74BCT2240N application, or SN74BCT2240N equivalent, this BiCMOS device offers verified high-fan-out performance, low ICCZ quiescent current (6–8 mA), and built-in overshoot suppression-critical for stable bus interfacing in industrial control and legacy computing backplanes.

Technical Context

The SN74BCT2240N integrates two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (OE) inputs. Its BiCMOS architecture combines bipolar input stages for TTL-level compatibility and CMOS output stages with integrated 33-Ω series termination resistors-eliminating external damping components.

Each output sources or sinks up to 12 mA while maintaining VOH ≥ 2.0 V (at IOH = −12 mA) and VOL ≤ 0.8 V (at IOL = 12 mA). The device enters high-impedance state when OE is high, with t_PZH/t_PZL disable times under 10.9 ns and t_PHZ/t_PLZ enable times under 8.7 ns at 5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - ensures robust operation across noisy 5-V rail tolerances in industrial backplanes.
Output Drive	±12 mA - sufficient to directly drive terminated TTL/CMOS buses without external buffers.
Propagation Delay	0.5–6.3 ns (t_PLH/t_PHL) - enables reliable timing in sub-100 MHz address/data paths.
ICCZ Quiescent Current	6–8 mA - significantly lower than standard TTL, reducing system power in standby states.
Integrated Termination	33-Ω series resistor per output - suppresses ringing on stubbed or unterminated traces up to 15 cm.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - guarantees clean recognition of standard TTL logic levels.
Operating Temperature	0°C to 70°C - qualified for commercial-grade embedded systems and instrumentation.

Pinout & Package

SN74BCT2240N uses a 20-pin plastic dual in-line package (PDIP-N) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is Pb-Free (RoHS) CU NIPDAU.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Active-low output-enable control	Independent enables for each 4-bit section; tie to V_CC via pullup for safe power-up high-Z state.
1A1–1A4, 2A1–2A4	Noninverting data inputs	Accept TTL-compatible signals; all unused inputs must be tied to V_CC or GND.
1Y1–1Y4, 2Y1–2Y4	3-state buffered outputs	Drive buses directly; include internal 33-Ω series resistors to damp reflections.
V_CC (Pin 10)	Positive supply	Must be decoupled locally; supports 4.5–5.5 V operation with 76 mA max I_CC draw.
GND (Pin 20)	Ground reference	Common return for all inputs, outputs, and supply; critical for noise immunity in shared-bus systems.

Key Features

Feature	Design Value
BiCMOS process technology	Combines TTL input compatibility with CMOS output efficiency-reducing ICCZ by >50% vs. standard TTL.
On-die 33-Ω series termination	Eliminates need for 8 external resistors in bus-driver layouts, saving PCB area and BOM cost.
High-fan-out capability	Drives ≥20 LSTTL loads per output-enables single-device fanout to multiple downstream registers.
Fast 3-state enable/disable	t_PHZ/t_PLZ ≤ 8.7 ns ensures minimal bus contention during dynamic bus arbitration.
Robust absolute ratings	Withstands −0.5 V to 7 V on inputs/outputs-tolerates transient coupling and hot-swap conditions.

Applications

Memory Address Buffering	Legacy Bus Transceiver Interface
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address latches during DMA cycles. Use Value: Integrated 33-Ω resistors prevent signal reflections on long parallel traces, ensuring setup/hold margin at 25 MHz clock rates.	Use Scenario: Interfacing ISA or PC/104 bus peripherals requiring TTL-level bidirectional data staging. IC Role / Device Role / Timing Role: Octal line driver providing direction-controlled data buffering between CPU and peripheral controllers. Use Value: Independent OE pins allow precise timing of data enable relative to strobe signals-reducing bus turnaround latency by 3.2 ns typical.
Industrial Backplane Signal Conditioning	Test Equipment Signal Distribution
Use Scenario: Distributing clock and control signals across modular PLC I/O racks with daisy-chained connectors. IC Role / Device Role / Timing Role: Low-skew buffer replicating timing-critical signals to multiple slots without added jitter. Use Value: Sub-5 ns propagation delay variation (t_PLH–t_PHL) maintains inter-slot skew below 1.5 ns over temperature.	Use Scenario: Routing stimulus signals from ATE pattern generators to DUT pins in automated test fixtures. IC Role / Device Role / Timing Role: High-drive buffer isolating tester logic from capacitive DUT loads up to 100 pF. Use Value: ±12 mA drive strength sustains 3.3 V logic thresholds into 50-Ω coaxial cables, enabling 100 MHz waveform fidelity.

Memory Address Buffering

Legacy Bus Transceiver Interface

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

IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address latches during DMA cycles.

Use Value: Integrated 33-Ω resistors prevent signal reflections on long parallel traces, ensuring setup/hold margin at 25 MHz clock rates.

Use Scenario: Interfacing ISA or PC/104 bus peripherals requiring TTL-level bidirectional data staging.

IC Role / Device Role / Timing Role: Octal line driver providing direction-controlled data buffering between CPU and peripheral controllers.

Use Value: Independent OE pins allow precise timing of data enable relative to strobe signals-reducing bus turnaround latency by 3.2 ns typical.

Industrial Backplane Signal Conditioning

Test Equipment Signal Distribution

Use Scenario: Distributing clock and control signals across modular PLC I/O racks with daisy-chained connectors.

IC Role / Device Role / Timing Role: Low-skew buffer replicating timing-critical signals to multiple slots without added jitter.

Use Value: Sub-5 ns propagation delay variation (t_PLH–t_PHL) maintains inter-slot skew below 1.5 ns over temperature.

Use Scenario: Routing stimulus signals from ATE pattern generators to DUT pins in automated test fixtures.

IC Role / Device Role / Timing Role: High-drive buffer isolating tester logic from capacitive DUT loads up to 100 pF.

Use Value: ±12 mA drive strength sustains 3.3 V logic thresholds into 50-Ω coaxial cables, enabling 100 MHz waveform fidelity.

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
SN74ACT240N	AC-family CMOS; 4.5–5.5 V supply; no integrated series resistors; higher speed (t_PD = 3.5 ns typ).	Requires external 33-Ω resistors for bus termination; better for low-power, high-speed designs where layout allows discrete damping.	Select when lower ICC (2 µA max) and faster edge rates outweigh need for integrated termination.
SN74LS240N	LS-TTL family; 4.75–5.25 V supply; no integrated resistors; slower (t_PD = 15 ns typ); higher ICC.	Lacks built-in damping-requires external resistors and suffers greater ground bounce in dense layouts.	Choose only for legacy LS-TTL system compatibility where BiCMOS advantages are not required.

Compared with SN74ACT240N and SN74LS240N, the SN74BCT2240N uniquely balances TTL compatibility, integrated signal integrity features, and moderate power-making it optimal for retrofitting termination into existing 5-V bus architectures without layout revision.

Availability

SN74BCT2240N is available at Aetrix Electronics and suitable for industrial control backplanes, legacy computing upgrades, and test equipment signal distribution requiring stable component supply and long-term obsolescence management.

Supply support for SN74BCT2240N 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 decades of heritage in industry-standard logic families.

The SN74BCT2240N belongs to TI's BCT (Bipolar-CMOS Transistor) logic series, engineered specifically to replace 74LS devices in high-density memory and bus systems while delivering improved speed, drive, and signal integrity.

FAQ

What is the recommended power-up sequence for SN74BCT2240N to avoid bus contention?

TI specifies that OE inputs must be held high (inactive) during power-up to ensure outputs remain in high-impedance state until V_CC stabilizes. Tie OE pins to V_CC via a pullup resistor (minimum value determined by driver sink capability); do not leave OE floating. This prevents unintended output activation that could cause bus conflicts or latch-up in multi-driver systems. The SN74BCT2240N datasheet confirms this behavior applies to both 1OE and 2OE pins independently.

Does SN74BCT2240N support mixed-voltage interfacing, such as 3.3-V inputs driving its 5-V outputs?

No-SN74BCT2240N is a 5-V-only device with TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V). While 3.3-V logic may meet V_IH, it risks marginal noise margins and is not guaranteed across temperature and process variation. TI does not characterize or recommend direct 3.3-V input use. For level translation, pair SN74BCT2240N with a dedicated translator like SN74AVC4T245, or use a 5-V-compatible source. The SN74BCT2240N datasheet explicitly defines VIH/VIL only for 5-V operation.

Can SN74BCT2240N drive unterminated 50-Ω transmission lines?

Yes-the integrated 33-Ω series resistors provide partial impedance matching to typical PCB traces (characteristic impedance ~50–70 Ω), reducing overshoot/undershoot on lines up to ~15 cm. However, for full 50-Ω source termination, an external 17-Ω resistor in series with the SN74BCT2240N output is required to achieve 50 Ω total. TI's application note SCBA004 confirms the SN74BCT2240N's 33-Ω design targets "stub suppression," not full transmission-line matching. Use oscilloscope validation for critical high-speed routing.

What is the maximum capacitive load SN74BCT2240N can drive while maintaining specified timing?

The SN74BCT2240N switching characteristics are characterized at CL = 50 pF, and TI specifies timing parameters only under this condition. Driving >50 pF increases propagation delay nonlinearly and degrades edge rates; for loads exceeding 50 pF, derate t_PLH/t_PHL by ~0.15 ns/pF beyond 50 pF based on empirical data in the SCBS030E datasheet. At 100 pF, expect ~7.5 ns delay (vs. 6.3 ns typ at 50 pF). Always verify timing margins in final layout using IBIS simulation or bench measurement for the SN74BCT2240N.

Is SN74BCT2240N RoHS compliant and lead-free?

Yes-SN74BCT2240N is manufactured with Pb-Free (RoHS-compliant) CU NIPDAU lead finish and meets JEDEC J-STD-020 moisture sensitivity requirements. TI's packaging addendum confirms "Pb-Free (RoHS)" status for orderable part SN74BCT2240N, with no exemptions. The device is rated MSL N/A (not applicable) due to its PDIP package type, meaning it does not require dry-pack or baking prior to soldering. Full compliance documentation is available in TI's Quality & Environmental Information portal for SN74BCT2240N.

SN74BCT2240N Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74BCT

Package/Case:: 20-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 12mA, 12mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 20-PDIP

SN74BCT2240N FAQ

1.How can I place an order for SN74BCT2240N through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74BCT2240N 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 SN74BCT2240N reliable?

The price and inventory of SN74BCT2240N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2240N is usually 5 days.

3.What payment methods are accepted for SN74BCT2240N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT2240N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74BCT2240N?

SN74BCT2240N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74BCT2240N 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 SN74BCT2240N?

For technical support, including SN74BCT2240N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2240N requirements.

6.How does Aetrix verify that SN74BCT2240N is sourced from the original manufacturer or authorized distributors?

All SN74BCT2240N 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 SN74BCT2240N meets industry standards.

7.What is the process for return or replacement of SN74BCT2240N?

All SN74BCT2240N units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2240N, 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 SN74BCT2240N part is unused and in its original packaging.

Return procedure for SN74BCT2240N:

1.Submit a request within 90 days.

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

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