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

Texas Instruments CD74AC623NS

Name: CD74AC623NS
Brand: Texas Instruments
SKU: CD74AC623NS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD74AC623NS

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: CD74AC623NS.pdf

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

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Product details

Overview

CD74AC623NS from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional data transmission in TTL/CMOS mixed-signal systems. It features ±24mA output drive, 5.5V absolute maximum supply rating, and operates across −55°C to +125°C. Used in industrial backplane interfaces and legacy control bus expansion.

For engineers reviewing the CD74AC623NS datasheet, CD74AC623NS pinout, CD74AC623NS application, or CD74AC623NS equivalent, key selection criteria include its 20-pin SOIC-NS package, 3-state enable control per direction, AC logic family propagation delay (typ. 8.5ns at VCC=5V), and compatibility with both CMOS and TTL input thresholds.

Technical Context

The CD74AC623NS implements dual 8-bit bidirectional bus transceivers with independent directional controls (1A→B and 1B→A) and separate 3-state enables (1OE, 2OE). Each direction uses non-inverting logic with symmetrical input thresholds (V_IH = 3.5V min, V_IL = 1.5V max at V_CC = 5V).

It belongs to the Advanced CMOS (AC) logic family, offering improved speed-power product over standard HC/HCT, with rail-to-rail output swing and guaranteed noise margins of ≥1.0V under worst-case conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	Advanced CMOS (AC) - ensures compatibility with 5V TTL inputs and full CMOS output swing
Supply Voltage Range	2.0V to 6.0V - supports mixed-voltage system interfacing and brown-out tolerance
Propagation Delay	8.5ns max (t_PLH/t_PHL at V_CC=5V) - enables reliable operation up to ~80MHz bus clocking
Output Drive	±24mA (I_OH/I_OL) - sufficient to drive 15pF loads with <10ns edge rates and fan-out of 10 LS-TTL loads
Operating Temperature	−55°C to +125°C - qualified for extended industrial/military environments without derating
Input Thresholds	V_IL ≤ 1.5V, V_IH ≥ 3.5V (at V_CC=5V) - provides 1.0V noise margin against TTL-level interference

Pinout & Package

CD74AC623NS is supplied in a 20-lead small-outline integrated circuit (SOIC) package with NS suffix, conforming to JEDEC MS-013 and TI DW drawing. Package height ≤2.65mm, body width 7.4–7.6mm, lead pitch 1.27mm.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	Direction Control (1DIR, 2DIR)	Active-high logic selects data flow direction: high = A→B, low = B→A
2, 18	Output Enable (1OE, 2OE)	Active-low enables 3-state outputs; both must be low for bidirectional operation
3–10	Data Inputs/Outputs A1–A8	Bidirectional I/O pins connected to port A; high-impedance when OE high
11–18	Data Inputs/Outputs B1–B8	Bidirectional I/O pins connected to port B; high-impedance when OE high
20	V_CC	Positive supply terminal (2.0V–6.0V); decoupling capacitor required at pin
10	GND	Ground reference for all logic and I/O; requires low-inductance connection

Key Features

Feature	Design Value
Bidirectional bus interface with independent DIR/OE	Enables flexible data routing in shared-bus architectures without external direction logic
±24mA output drive capability	Drives long traces or multiple loads without external buffers in industrial backplanes
Wide V_CC range (2.0V–6.0V)	Permits direct interfacing between 3.3V controllers and 5V peripherals without level shifters
Guaranteed 1.0V noise margin at V_CC=5V	Ensures robust operation in electrically noisy factory-floor environments
Extended temperature qualification (−55°C to +125°C)	Supports deployment in unheated outdoor enclosures or engine-control proximity applications

Applications

Industrial PLC Backplane Interface	Military Data Acquisition Bus
Use Scenario: Interfacing CPU modules to I/O expansion cards in modular programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing 8-bit parallel communication between processor and peripheral slots. Use Value: Independent DIR/OE controls allow dynamic direction switching during runtime without bus contention.	Use Scenario: Connecting ADC/DAC modules to central processing units in ruggedized field-deployed instrumentation. IC Role / Device Role / Timing Role: Level-shifting and bus-isolating transceiver enabling interoperability between mixed-voltage subsystems. Use Value: −55°C to +125°C operation ensures reliability in extreme environmental conditions without thermal derating.
Legacy Avionics Maintenance Port	Automotive Engine Control Diagnostics
Use Scenario: Providing service access to flight-critical avionics via standardized maintenance interface connectors. IC Role / Device Role / Timing Role: Isolated bidirectional data bridge between ground-test equipment and onboard ARINC-429 or MIL-STD-1553 buses. Use Value: High noise immunity and rail-to-rail output swing prevent bit errors during ground-to-aircraft cable runs.	Use Scenario: Enabling real-time diagnostic data exchange between ECU microcontrollers and external scan tools. IC Role / Device Role / Timing Role: Transceiver buffering CAN protocol physical layer signals and isolating test interface from main power domain. Use Value: 3-state outputs permit hot-plug diagnostics without disrupting ongoing engine control operations.

Industrial PLC Backplane Interface

Military Data Acquisition Bus

Use Scenario: Interfacing CPU modules to I/O expansion cards in modular programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional data transceiver managing 8-bit parallel communication between processor and peripheral slots.

Use Value: Independent DIR/OE controls allow dynamic direction switching during runtime without bus contention.

Use Scenario: Connecting ADC/DAC modules to central processing units in ruggedized field-deployed instrumentation.

IC Role / Device Role / Timing Role: Level-shifting and bus-isolating transceiver enabling interoperability between mixed-voltage subsystems.

Use Value: −55°C to +125°C operation ensures reliability in extreme environmental conditions without thermal derating.

Legacy Avionics Maintenance Port

Automotive Engine Control Diagnostics

Use Scenario: Providing service access to flight-critical avionics via standardized maintenance interface connectors.

IC Role / Device Role / Timing Role: Isolated bidirectional data bridge between ground-test equipment and onboard ARINC-429 or MIL-STD-1553 buses.

Use Value: High noise immunity and rail-to-rail output swing prevent bit errors during ground-to-aircraft cable runs.

Use Scenario: Enabling real-time diagnostic data exchange between ECU microcontrollers and external scan tools.

IC Role / Device Role / Timing Role: Transceiver buffering CAN protocol physical layer signals and isolating test interface from main power domain.

Use Value: 3-state outputs permit hot-plug diagnostics without disrupting ongoing engine control operations.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT245N	Single-directional 3-state enable; no per-port DIR control; 8-bit unidirectional buffer	Requires external logic for bidirectional use; lower pin count but less flexible routing	Choose when only unidirectional data flow is needed and board space is constrained
CD74ACT623M96	Same pinout and function but ACT family (TTL-compatible inputs); slightly higher ICC, faster t_P	Compatible in same PCB footprint but requires verification of input threshold compatibility with driving source	Prefer when driving sources are strictly TTL-output devices or when sub-7ns propagation is critical

Compared with SN74ACT245N and CD74ACT623M96, the CD74AC623NS offers native bidirectional control without added logic, wider V_CC tolerance (2.0–6.0V vs. 4.5–5.5V), and superior noise immunity-making it optimal for mixed-voltage, noise-prone industrial backplanes.

Availability

CD74AC623NS is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, military data acquisition systems, and automotive diagnostic ports requiring stable component supply across extended temperature ranges.

Supply support for CD74AC623NS 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The CD74AC623NS belongs to TI's Advanced CMOS logic portfolio, engineered for high-reliability, mixed-signal interfacing in harsh-environment applications where voltage flexibility and noise resilience are critical.

FAQ

What is the maximum operating frequency supported by the CD74AC623NS?

The CD74AC623NS does not specify a maximum clock frequency in its datasheet because it is a combinatorial bus transceiver-not a clocked device. Its usable data rate depends on propagation delay (8.5ns max) and load capacitance. With typical 15pF loads and clean edges, the CD74AC623NS reliably supports asynchronous bus transfers up to approximately 80MHz. System timing must account for setup/hold margins relative to controlling logic.

Does the CD74AC623NS support 3.3V-only operation?

Yes, the CD74AC623NS supports 3.3V-only operation within its specified 2.0V–6.0V V_CC range. At V_CC = 3.3V, it maintains full logic functionality, with V_IH = 2.0V min and V_IL = 1.0V max, ensuring compatibility with standard 3.3V CMOS outputs. Output swing remains rail-to-rail, delivering >3.1V VOH and <0.2V VOL under 24mA load.

Is the CD74AC623NS pin-compatible with the CD74ACT623 series?

Yes, the CD74AC623NS is pin-compatible with CD74ACT623M96 and other 20-pin SOIC variants in the 623 family, sharing identical DW package outline, pin numbering, and functional pin assignments. However, input thresholds differ: CD74AC623NS uses CMOS-compatible thresholds, while CD74ACT623 requires TTL-level inputs. Electrical interface validation is required before substitution.

What is the meaning of the 'NS' suffix in CD74AC623NS?

The 'NS' suffix in CD74AC623NS denotes Texas Instruments' small-outline plastic package with a specific mold compound and lead finish, compliant with RoHS and green (low-halogen) standards. It corresponds to the DW package drawing and is functionally identical to the 'M' and 'M96' suffixes-differing only in reel quantity (25 pcs vs. 2000 pcs) and marking format, not electrical or mechanical behavior.

Can the CD74AC623NS be used in place of a 74LS245 in legacy designs?

The CD74AC623NS can replace 74LS245 in many legacy designs due to matching pinout, 3-state operation, and bidirectional capability-but with important caveats: it operates at higher speeds (8.5ns vs. 20ns), draws less quiescent current, and requires careful attention to V_CC decoupling and input transition rates. Its CMOS inputs are more sensitive to slow edges than LS TTL, so Schmitt-trigger buffers may be needed on slow control lines.

CD74AC623NS Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AC

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

Packaging:: Bulk

Product Status:: Active

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:: 24mA, 24mA

Voltage - Supply:: 1.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

CD74AC623NS FAQ

1.How can I place an order for CD74AC623NS through Aetrix?

Please submit a Request for Quotation (RFQ) for CD74AC623NS 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 CD74AC623NS reliable?

The price and inventory of CD74AC623NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC623NS is usually 5 days.

3.What payment methods are accepted for CD74AC623NS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC623NS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD74AC623NS?

CD74AC623NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD74AC623NS 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 CD74AC623NS?

For technical support, including CD74AC623NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC623NS requirements.

6.How does Aetrix verify that CD74AC623NS is sourced from the original manufacturer or authorized distributors?

All CD74AC623NS 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 CD74AC623NS meets industry standards.

7.What is the process for return or replacement of CD74AC623NS?

All CD74AC623NS units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC623NS, 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 CD74AC623NS part is unused and in its original packaging.

Return procedure for CD74AC623NS:

1.Submit a request within 90 days.

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

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