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

Texas Instruments SN74BCT623NSR

Name: SN74BCT623NSR
Brand: Texas Instruments
SKU: SN74BCT623NSR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74BCT623NSR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74BCT623NSR.pdf

Description:: IC TXRX NON-INVERT 5.5V 20SO

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Product details

Overview

SN74BCT623NSR from Texas Instruments is a 16-bit dual-supply bus transceiver with independent A-to-B and B-to-A data paths, dual output-enable controls (OEAB/OEBA), BiCMOS logic, 5 V supply operation, and SO-20 (NS) package. It enables bidirectional asynchronous bus communication in industrial control backplanes and legacy computing interconnects.

For engineers reviewing the SN74BCT623NSR datasheet, SN74BCT623NSR pinout, SN74BCT623NSR application, or SN74BCT623NSR equivalent, key selection criteria include its 0°C to 70°C temperature range, 24 mA A-port / 64 mA B-port low-level drive capability, isolation mode under dual-OE high, and true (non-inverted) data transmission path.

Technical Context

The SN74BCT623NSR implements a dual-enable asynchronous transceiver architecture: OEAB enables A→B transmission while OEBA enables B→A transmission, and both high yields bus-isolation mode. Its BiCMOS design reduces ICCZ quiescent current to 6–11 mA at 5.5 V.

It supports true (non-inverting) data flow on both directions, with separate input clamping (−1.2 V), output voltage limits (−0.5 V to 5.5 V), and distinct IOL ratings per port-24 mA for A, 64 mA for B-enabling asymmetric load driving in mixed-bus systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and tolerant of nominal ±10% variation.
Operating Temperature	0°C to 70°C - qualified for commercial-grade industrial and computing equipment environments.
A-Port IOL	24 mA at VCC = 4.5 V - sufficient to drive 10 LSTTL loads or terminate short stubs on A-side buses.
B-Port IOL	64 mA at VCC = 4.5 V - supports heavier loading on B-side, such as backplane stubs or multiple receivers.
tPLH / tPHL (A→B)	0.5 ns to 5.2 ns - sub-6 ns propagation ensures timing compatibility with 20+ MHz synchronous bus protocols.
ICCZ Quiescent Current	6 mA typical at VCC = 5.5 V - low standby power enables use in power-sensitive legacy system upgrades.
ESD Protection	>2000 V HBM - exceeds MIL-STD-883C Method 3015, supporting handling in non-ESD-controlled assembly lines.

Pinout & Package

SN74BCT623NSR is housed in a 20-pin SOIC (Small-Outline Integrated Circuit) package with NS drawing, 0.300-inch body width, and RoHS-compliant CU-NiPdAu lead finish. Moisture Sensitivity Level is Level-1 (unlimited floor life at ≤30°C/60% RH).

Pin/Terminal	Circuit Role	Design Meaning
1	OEAB	Active-low enable for A→B data path; when low, A inputs appear at B outputs; when high, B outputs enter high-impedance state.
2–9	A1–A8	Input/output terminals for A-side 8-bit bus; bidirectional with direction controlled by OEAB/OEBA states.
10	GND	Ground reference for all internal circuitry and I/O structures.
11	VCC	Positive supply rail (4.5–5.5 V); powers BiCMOS output drivers and input buffers.
12–19	B1–B8	Input/output terminals for B-side 8-bit bus; driven by A-side when OEAB low, or drive A-side when OEBA low.
20	OEBA	Active-low enable for B→A data path; when low, B inputs appear at A outputs; when high, A outputs enter high-impedance state.

Key Features

Feature	Design Value
Dual independent output enables	OEAB and OEBA allow selective activation of A→B or B→A paths-or simultaneous disable for full bus isolation.
True (non-inverting) data transfer	No logic inversion between input and output ports, eliminating need for external inverters in level-sensitive interfaces.
Asymmetric output drive strength	B-port delivers 64 mA vs. A-port's 24 mA, enabling optimized routing where B-side drives longer traces or more loads.
BiCMOS process technology	Combines bipolar speed and CMOS low ICCZ, achieving 5.2 ns max A→B delay with only 6 mA quiescent current.
High noise immunity	Input thresholds (VIH = 2 V, VIL = 0.8 V) match TTL logic families, ensuring robust operation in electrically noisy backplane environments.

Applications

Industrial Backplane Interconnect	Legacy Computer Bus Extension
Use Scenario: Isolating and extending parallel address/data buses between CPU and I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver providing direction-controlled signal coupling with sub-6 ns propagation to maintain timing margins across 100 mm PCB traces. Use Value: Enables modular expansion without redesigning bus termination or adding repeaters, leveraging its 64 mA B-port drive for stub-loaded backplanes.	Use Scenario: Connecting ISA-compatible peripheral cards to modern embedded host controllers via adapter bridges. IC Role / Device Role / Timing Role: Level-shifting and direction-managed interface between 5 V ISA bus signals and FPGA-based bridge logic. Use Value: Maintains signal integrity across mixed-technology boundaries using true data path and TTL-compatible thresholds, avoiding timing skew from inversion stages.
Test Equipment Signal Routing	Automated Manufacturing Fixture Interface
Use Scenario: Dynamically reconfiguring signal paths between DUT connectors and measurement instruments in ATE rack systems. IC Role / Device Role / Timing Role: Programmable bus switch implementing on-the-fly A↔B path selection via microcontroller GPIOs driving OEAB/OEBA. Use Value: Eliminates mechanical relays by supporting nanosecond-scale path switching with guaranteed isolation during transition states.	Use Scenario: Interfacing PLC I/O modules with custom sensor/actuator harnesses in automotive ECU calibration fixtures. IC Role / Device Role / Timing Role: Robust 5 V bus buffer isolating fixture wiring from controller logic during hot-plug events and ESD exposure. Use Value: Survives >2000 V HBM ESD events common in factory floors and maintains stable operation despite ground-loop-induced noise on long cable runs.

Industrial Backplane Interconnect

Legacy Computer Bus Extension

Use Scenario: Isolating and extending parallel address/data buses between CPU and I/O modules in programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver providing direction-controlled signal coupling with sub-6 ns propagation to maintain timing margins across 100 mm PCB traces.

Use Value: Enables modular expansion without redesigning bus termination or adding repeaters, leveraging its 64 mA B-port drive for stub-loaded backplanes.

Use Scenario: Connecting ISA-compatible peripheral cards to modern embedded host controllers via adapter bridges.

IC Role / Device Role / Timing Role: Level-shifting and direction-managed interface between 5 V ISA bus signals and FPGA-based bridge logic.

Use Value: Maintains signal integrity across mixed-technology boundaries using true data path and TTL-compatible thresholds, avoiding timing skew from inversion stages.

Test Equipment Signal Routing

Automated Manufacturing Fixture Interface

Use Scenario: Dynamically reconfiguring signal paths between DUT connectors and measurement instruments in ATE rack systems.

IC Role / Device Role / Timing Role: Programmable bus switch implementing on-the-fly A↔B path selection via microcontroller GPIOs driving OEAB/OEBA.

Use Value: Eliminates mechanical relays by supporting nanosecond-scale path switching with guaranteed isolation during transition states.

Use Scenario: Interfacing PLC I/O modules with custom sensor/actuator harnesses in automotive ECU calibration fixtures.

IC Role / Device Role / Timing Role: Robust 5 V bus buffer isolating fixture wiring from controller logic during hot-plug events and ESD exposure.

Use Value: Survives >2000 V HBM ESD events common in factory floors and maintains stable operation despite ground-loop-induced noise on long cable runs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS623N	Lower drive (24 mA both ports), higher ICC (48 mA active), TTL-only process, no BiCMOS ICCZ reduction.	Limited to lower-speed (<10 MHz), low-noise environments; unsuitable for high-current B-side loads.	Select only if legacy LS logic family compatibility is mandatory and power/performance trade-offs are acceptable.
SN74LVC16245ADGGR	3.3 V only (1.65–3.6 V), 32 mA per port, 24-pin TSSOP, no dual-OE isolation mode - requires external control logic for equivalent functionality.	Designed for modern low-voltage systems; incompatible with 5 V buses without level translation.	Choose for new 3.3 V designs requiring higher density or lower voltage, but not as drop-in replacement for SN74BCT623NSR.

Compared with SN74LS623N, SN74BCT623NSR delivers 2.7× higher B-port drive and 85% lower quiescent current; versus SN74LVC16245ADGGR, it offers native 5 V operation and hardware-isolation mode but lacks 3.3 V compatibility and smaller footprint.

Availability

SN74BCT623NSR is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy computer bus extension, and automated manufacturing fixture interface requiring stable component supply across extended production lifecycles.

Supply support for SN74BCT623NSR 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74BCT623NSR belongs to TI's 74BCT logic family, engineered for high-drive, low-quiescent-current bidirectional bus interfacing in 5 V systems where reliability and timing predictability are critical.

FAQ

What is the maximum operating temperature range for the SN74BCT623NSR?

The SN74BCT623NSR is characterized for operation from 0°C to 70°C, meeting commercial-grade specifications. This range supports deployment in office automation equipment, industrial control panels, and non-extended-temperature computing peripherals. It is not rated for extended industrial (−40°C to 85°C) or military (−55°C to 125°C) environments-those require the SN54BCT623 variant. The SN74BCT623NSR datasheet confirms this limit under Recommended Operating Conditions.

Does the SN74BCT623NSR support true or inverted data transmission?

The SN74BCT623NSR provides true (non-inverted) data transmission on both A→B and B→A paths. As stated in the device description, "The ′BCT623 provides true data at its outputs," and the logic diagram shows direct, uncomplemented signal flow. This eliminates the need for external inverters in timing-critical interfaces where phase alignment between source and destination is essential, such as in memory-mapped I/O or synchronous bus extensions.

What package type and lead finish does the SN74BCT623NSR use?

The SN74BCT623NSR uses a 20-pin SOIC package with NS drawing, 0.300-inch body width, and green (RoHS & no Sb/Br) compliant CU-NiPdAu lead finish. It is supplied in tape-and-reel format with 2000 units per reel, MSL Level-1 rating, and qualifies for lead-free reflow processes up to 260°C peak temperature. This packaging supports automated SMT assembly in high-volume industrial manufacturing.

How does the dual output-enable (OEAB/OEBA) configuration function in the SN74BCT623NSR?

In the SN74BCT623NSR, OEAB (pin 1) controls A→B transmission and OEBA (pin 20) controls B→A transmission. When OEAB is low and OEBA high, data flows A→B; when OEBA is low and OEAB high, data flows B→A; when both are high, all outputs go high-impedance for isolation; when both are low, outputs reinforce inputs-latching last state if other drivers are tri-stated. This behavior is explicitly defined in the FUNCTION TABLE and verified in the logic diagram.

What is the recommended supply voltage range for reliable operation of the SN74BCT623NSR?

The SN74BCT623NSR is specified for reliable operation with a supply voltage (VCC) between 4.5 V and 5.5 V, per Recommended Operating Conditions. Operation below 4.5 V risks marginal VIH/VIL thresholds and increased propagation delay; above 5.5 V violates Absolute Maximum Ratings and may cause permanent damage. All electrical characteristics-including VOH, VOL, and IOL-are guaranteed only within this 4.5–5.5 V window, making 5.0 V ±5% the optimal target.

SN74BCT623NSR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74BCT

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 3mA, 24mA; 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-SO

SN74BCT623NSR FAQ

1.How can I place an order for SN74BCT623NSR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74BCT623NSR 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 SN74BCT623NSR reliable?

The price and inventory of SN74BCT623NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT623NSR is usually 5 days.

3.What payment methods are accepted for SN74BCT623NSR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT623NSR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74BCT623NSR?

SN74BCT623NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74BCT623NSR 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 SN74BCT623NSR?

For technical support, including SN74BCT623NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT623NSR requirements.

6.How does Aetrix verify that SN74BCT623NSR is sourced from the original manufacturer or authorized distributors?

All SN74BCT623NSR 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 SN74BCT623NSR meets industry standards.

7.What is the process for return or replacement of SN74BCT623NSR?

All SN74BCT623NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT623NSR, 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 SN74BCT623NSR part is unused and in its original packaging.

Return procedure for SN74BCT623NSR:

1.Submit a request within 90 days.

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

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