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

NXP Semiconductors 74HC243N,652

Name: 74HC243N,652
Brand: NXP Semiconductors
SKU: 74HC243N,652
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HC243N,652

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: 74HC243N,652.pdf

Description:: IC TXRX NON-INVERT 6V 14DIP

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Product details

Overview

74HC243N,652 from NXP Semiconductors (formerly Philips) is a quad non-inverting 3-state bus transceiver for asynchronous bidirectional data transfer between two 4-bit buses. It features dual independent output-enable inputs (OEA and OEB), operates from 2.0 V to 6.0 V, delivers 6 ns typical propagation delay at 5 V/15 pF, and supports industrial temperature range (−40 °C to +125 °C). It enables isolated bus communication in legacy TTL-compatible digital systems.

For engineers reviewing the 74HC243N,652 datasheet, 74HC243N,652 pinout, 74HC243N,652 application, or 74HC243N,652 equivalent, key selection criteria include 3-state bidirectional control timing, supply voltage flexibility (2–6 V), thermal robustness up to +125 °C, DIP14 package compatibility with through-hole prototyping, and JEDEC 7A compliance for LSTTL interoperability.

Technical Context

The 74HC243N,652 implements four independent bidirectional data paths (A0↔B0 through A3↔B3), each controlled by separate active-low enable signals OEA and OEB. When both enables are low, data flows transparently in either direction; when either enable is high, its associated bus side enters high-impedance state.

Its CMOS silicon-gate architecture ensures low static current (≤160 µA at 6 V/−40 °C to +125 °C), ESD tolerance (>2000 V HBM), and rail-to-rail output swing. The device adheres strictly to JEDEC standard no. 7A, guaranteeing pin and functional compatibility with 74LS243 while delivering superior speed and power efficiency.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.0 V to 6.0 V - Supports mixed-voltage system interfacing and battery-backed operation down to 2 V.
Propagation Delay (t_PHL/t_PLH)	6 ns typical at V_CC = 5 V, C_L = 15 pF - Enables reliable 80+ MHz bus toggle rates in synchronous edge-triggered designs.
3-State Enable/Disable Time	t_PZH/t_PLZ = 14 ns typical at V_CC = 6 V - Ensures clean bus arbitration with minimal contention window during direction switching.
Output Drive Strength	±7.8 mA at V_CC = 6 V - Sufficient to drive 10 LSTTL loads or 15 pF traces without external buffering.
Input/Output Capacitance	C_I = 3.5 pF, C_I/O = 10 pF - Minimizes capacitive loading on driving logic and preserves signal integrity on high-speed buses.
Operating Temperature	−40 °C to +125 °C - Qualified for under-hood automotive, industrial PLC backplanes, and extended-range embedded controllers.
ESD Protection	HBM > 2000 V, MM > 200 V - Reduces risk of handling damage and improves field reliability in unshielded environments.

Pinout & Package

DIP14 plastic dual in-line package (300 mil, SOT27-1), 14-pin through-hole mount with 2.54 mm pitch; suitable for breadboarding, wave soldering, and legacy PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 (OEA)	Active-low output enable for A-side bus	Drives all A0–A3 pins to high-Z when HIGH; enables bidirectional flow when LOW.
2 (n.c.)	No-connect terminal	Internally unconnected; must remain floating or grounded per layout best practice.
3–6 (A0–A3)	Bidirectional I/O for A-bus lines	Function as inputs or outputs depending on OEA/OEB states; support true (non-inverting) data transfer.
7 (GND)	Ground reference	Primary 0 V return path; requires low-inductance connection to minimize ground bounce.
8–11 (B3–B0)	Bidirectional I/O for B-bus lines	Function as inputs or outputs depending on OEA/OEB states; mirror A-side behavior with non-inverting logic.
12 (n.c.)	No-connect terminal	Internally unconnected; must remain floating or grounded per layout best practice.
13 (OEB)	Active-low output enable for B-side bus	Drives all B0–B3 pins to high-Z when HIGH; enables bidirectional flow when LOW.
14 (V_CC)	Positive supply voltage	Accepts 2.0–6.0 V; requires local 100 nF ceramic decoupling adjacent to pin.

Key Features

Feature	Design Value
Non-inverting 3-state outputs	Preserves logic polarity across both directions, eliminating need for external inverters in full-duplex bus architectures.
Independent dual enable control	OEA and OEB allow asymmetric bus isolation - e.g., A-bus held active while B-bus tri-stated for diagnostics or arbitration.
JEDEC 7A compliance	Guarantees drop-in replacement for 74LS243 in existing LSTTL designs without timing or interface redesign.
Wide temperature operation	Specified from −40 °C to +125 °C enables use in engine control units, motor drives, and outdoor telecom equipment.
Low dynamic power dissipation	CPD = 26 pF enables predictable µW-level dynamic power calculation (PD = CPD × V_CC² × f_i × N) for thermal budgeting.

Applications

Industrial Backplane Interfacing	Legacy System Bus Extension
Use Scenario: Connecting a microcontroller's address/data bus to a peripheral expansion slot in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus isolation transceiver enabling hot-swap-capable module insertion without disrupting main CPU bus activity. Use Value: Prevents bus contention during module insertion/removal via independent OEA/OEB control, supporting field-upgradeable I/O configurations.	Use Scenario: Extending an 8-bit ISA-style bus between two PCBs in test instrumentation rack systems. IC Role / Device Role / Timing Role: Quad-channel bus repeater with 3-state control, synchronizing timing-critical address strobes and data transfers across board boundaries. Use Value: 6 ns propagation delay ensures setup/hold timing margins are preserved across 15 cm inter-board traces at 20 MHz operation.
Automotive Diagnostic Interface	Embedded Controller Debug Port
Use Scenario: Isolating a vehicle's CAN controller debug port from its main ECU bus during firmware updates. IC Role / Device Role / Timing Role: Direction-controlled data bridge allowing bidirectional UART or JTAG traffic while blocking noise coupling into safety-critical CAN lines. Use Value: −40 °C to +125 °C rating and 6 V max V_CC tolerate automotive battery transients and under-hood thermal stress.	Use Scenario: Providing a configurable debug access point between an ARM Cortex-M core and external logic analyzer probes. IC Role / Device Role / Timing Role: 4-bit bidirectional trace buffer that can be enabled/disabled dynamically to capture instruction fetch or data read cycles without altering core clock domain. Use Value: 3.5 pF input capacitance minimizes signal distortion on high-frequency trace lines, preserving edge fidelity up to 100 MHz.

Industrial Backplane Interfacing

Legacy System Bus Extension

Use Scenario: Connecting a microcontroller's address/data bus to a peripheral expansion slot in programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus isolation transceiver enabling hot-swap-capable module insertion without disrupting main CPU bus activity.

Use Value: Prevents bus contention during module insertion/removal via independent OEA/OEB control, supporting field-upgradeable I/O configurations.

Use Scenario: Extending an 8-bit ISA-style bus between two PCBs in test instrumentation rack systems.

IC Role / Device Role / Timing Role: Quad-channel bus repeater with 3-state control, synchronizing timing-critical address strobes and data transfers across board boundaries.

Use Value: 6 ns propagation delay ensures setup/hold timing margins are preserved across 15 cm inter-board traces at 20 MHz operation.

Automotive Diagnostic Interface

Embedded Controller Debug Port

Use Scenario: Isolating a vehicle's CAN controller debug port from its main ECU bus during firmware updates.

IC Role / Device Role / Timing Role: Direction-controlled data bridge allowing bidirectional UART or JTAG traffic while blocking noise coupling into safety-critical CAN lines.

Use Value: −40 °C to +125 °C rating and 6 V max V_CC tolerate automotive battery transients and under-hood thermal stress.

Use Scenario: Providing a configurable debug access point between an ARM Cortex-M core and external logic analyzer probes.

IC Role / Device Role / Timing Role: 4-bit bidirectional trace buffer that can be enabled/disabled dynamically to capture instruction fetch or data read cycles without altering core clock domain.

Use Value: 3.5 pF input capacitance minimizes signal distortion on high-frequency trace lines, preserving edge fidelity up to 100 MHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74HC242N,652	Has inverting outputs (A→B inverted, B→A inverted); identical pinout and electrical specs otherwise.	Suitable only where complementary logic polarity is required in both directions; not interchangeable without logic inversion in external circuitry.	Select 74HC242N,652 only if system design explicitly depends on inverted bus signaling; otherwise 74HC243N,652 provides direct polarity preservation.
SN74HC243N	TI-manufactured version with identical functionality, pinout, and JEDEC 7A compliance; minor differences in ESD ratings (HBM > 4000 V).	Drop-in compatible in all 74HC243N,652 applications; preferred where TI supply chain preference or dual-sourcing is mandated.	Choose SN74HC243N for second-source assurance or TI-design ecosystem alignment; electrical performance and timing match 74HC243N,652 within datasheet tolerances.

Compared with 74HC243N,652, the 74HC242N,652 requires external inversion for true-data paths, while the SN74HC243N offers identical function with enhanced HBM ESD margin - making it ideal for high-reliability manufacturing environments where electrostatic handling risk is elevated.

Availability

74HC243N,652 is available at Aetrix Electronics and suitable for industrial backplane interfacing, legacy system bus extension, automotive diagnostic interface, and embedded controller debug port applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC243N,652 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

NXP Semiconductors, formerly Philips Semiconductors, is a global leader in high-performance analog and logic ICs, with expertise in automotive, industrial, and secure connectivity solutions.

The 74HC243N,652 belongs to NXP's 74HC high-speed CMOS logic family, designed specifically for pin-compatible upgrades of legacy TTL systems while delivering lower power, wider voltage range, and improved noise immunity.

FAQ

What is the maximum operating supply voltage for the 74HC243N,652?

The 74HC243N,652 supports a maximum supply voltage of +7.0 V as an absolute limiting value, but its recommended operating range is 2.0 V to 6.0 V. Operation above 6.0 V risks exceeding safe power dissipation limits and may degrade long-term reliability; therefore, 6.0 V is the practical upper limit for sustained use. The 74HC243N,652 must never be operated continuously at 7.0 V.

Does the 74HC243N,652 support hot-swapping between buses?

The 74HC243N,652 supports controlled hot-swapping via its independent OEA and OEB inputs: asserting either enable HIGH places its associated bus side in high-impedance state, preventing signal contention during insertion or removal. However, the 74HC243N,652 itself lacks built-in bus-fault protection or slew-rate control, so external series resistors or current-limiting circuits are recommended for robust hot-swap implementation.

How does the 74HC243N,652 differ from the 74HC242N,652?

The 74HC243N,652 features non-inverting (true) outputs in both directions, whereas the 74HC242N,652 provides inverting outputs. Both share identical pinout, supply range, timing specs, and temperature rating. This functional difference means they are not electrically interchangeable without modifying upstream/downstream logic to compensate for polarity inversion in the 74HC242N,652.

Can the 74HC243N,652 operate reliably at 2.0 V supply?

Yes, the 74HC243N,652 is fully specified down to 2.0 V supply, with guaranteed propagation delay ≤135 ns and output drive ≥±3.5 mA at V_CC = 2.0 V and −40 °C to +125 °C. Its input thresholds scale with V_CC, ensuring correct logic interpretation across the full voltage range - making the 74HC243N,652 suitable for battery-powered or low-voltage microcontroller interfaces.

Is the 74HC243N,652 pin-compatible with 74LS243?

Yes, the 74HC243N,652 is explicitly designed to be pin-compatible and functionally equivalent to the 74LS243, complying with JEDEC standard no. 7A. It matches the 74LS243's pin configuration, logic behavior, and DC/AC electrical interface - enabling direct replacement in existing LSTTL designs while delivering lower power consumption, higher noise immunity, and extended voltage/temperature operation.

74HC243N,652 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74HC

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-DIP

74HC243N,652 FAQ

1.How can I place an order for 74HC243N,652 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HC243N,652 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 74HC243N,652 reliable?

The price and inventory of 74HC243N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC243N,652 is usually 5 days.

3.What payment methods are accepted for 74HC243N,652?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC243N,652 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HC243N,652?

74HC243N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HC243N,652 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 74HC243N,652?

For technical support, including 74HC243N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC243N,652 requirements.

6.How does Aetrix verify that 74HC243N,652 is sourced from the original manufacturer or authorized distributors?

All 74HC243N,652 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 74HC243N,652 meets industry standards.

7.What is the process for return or replacement of 74HC243N,652?

All 74HC243N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC243N,652, 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 74HC243N,652 part is unused and in its original packaging.

Return procedure for 74HC243N,652:

1.Submit a request within 90 days.

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

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