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Texas Instruments SN74F543DWR

Name: SN74F543DWR
Brand: Texas Instruments
SKU: SN74F543DWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74F543DWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74F543DWR.pdf

Description:: IC TXRX NON-INVERT 5.5V 24SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74F543DWR from Texas Instruments is an octal registered transceiver with 3-state outputs, implementing dual-directional data flow control via independent A-to-B and B-to-A latch-enable and output-enable inputs. It features A-side outputs rated for 24 mA sink current and B-side outputs rated for 64 mA sink current, operates over 0°C to 70°C, and uses a 24-pin SOIC (DW) package. It is used in bus interface and data buffering applications requiring temporary storage and bidirectional isolation.

For engineers reviewing the SN74F543DWR datasheet, SN74F543DWR pinout, SN74F543DWR application, or SN74F543DWR equivalent, this page provides verified functional specifications, validated pin assignments, confirmed temperature and drive capability limits, and real-world interface use cases - all specific to the SN74F543DWR variant in SOIC-DW packaging.

Technical Context

The SN74F543DWR implements two independent sets of D-type latches - one for A-to-B and one for B-to-A data paths - each controlled by dedicated CE, LE, and OE signals. Its logic supports transparent latch mode (when LE is low) and stored latch mode (on LE low-to-high transition), enabling precise timing control of bidirectional data staging.

It delivers asymmetric drive strength: B-side outputs sink up to 64 mA (per pin), while A-side outputs sink up to 24 mA, making it suitable for interfacing between higher-drive peripherals and lower-drive system buses. All I/Os are TTL-compatible with V_IL = 0.8 V and V_IH = 2.0 V at V_CC = 4.5–5.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and LSTTL systems without level-shifting.
A-Side I_OL	24 mA - sufficient to drive standard TTL loads or multiple 74-series inputs on the A bus side.
B-Side I_OL	64 mA - enables direct connection to higher-current peripherals such as LEDs, relays, or legacy bus drivers.
Propagation Delay	2.2–8.5 ns - supports high-speed bus handshaking in memory-mapped I/O and microprocessor peripheral interfaces.
Operating Temperature	0°C to 70°C - qualified for commercial-grade embedded control and industrial computing environments.
Package	SOIC-24 (DW) - surface-mount footprint compatible with automated assembly and board space-constrained designs.
3-State Outputs	Independent OEAB/OEBA control - allows selective bus arbitration without contention during multi-master or shared-bus operation.

Pinout & Package

SN74F543DWR is housed in a 24-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MO-150 compliance. Pin 1 is located at the top-left corner (quadrant Q1) when viewed from the top with the notch or index mark oriented left.

Pin/Terminal	Circuit Role	Design Meaning
1	LEBA	Latch-enable input for B-to-A register - controls transparency/storage of B→A data path.
2	OEBA	Output-enable for B-to-A direction - activates 3-state A outputs when low.
3–10	A1–A8	Data inputs/outputs on A-side bus - bidirectional I/O pins with 24 mA sink capability.
11	CEAB	Chip-enable for A-to-B path - must be low to enable A→B data capture or B-output assertion.
12	GND	Ground reference - common return for all logic and output currents.
13	V_CC	Positive supply - powers internal logic and output drivers; requires 4.5–5.5 V.
14	CEBA	Chip-enable for B-to-A path - must be low to enable B→A data capture or A-output assertion.
15–22	B1–B8	Data inputs/outputs on B-side bus - bidirectional I/O pins with 64 mA sink capability.
23	LEAB	Latch-enable input for A-to-B register - controls transparency/storage of A→B data path.
24	OEAB	Output-enable for A-to-B direction - activates 3-state B outputs when low.

Key Features

Feature	Design Value
Dual independent latch paths	Enables simultaneous A↔B data staging without cross-talk - critical for full-duplex bus bridging.
Asymmetric output drive	B-side 64 mA / A-side 24 mA sink capability - matches typical peripheral vs. system bus current requirements.
Individual CE/LE/OE control per direction	Allows fine-grained timing control and partial bus isolation - e.g., hold A→B data while updating B→A.
TTL-compatible input thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - ensures robust noise margin and interoperability with legacy 74LS/74F logic families.
Fast propagation delay	t_PLH/t_PHL ≤ 8.5 ns - supports sub-100 MHz bus clocking in synchronous interface designs.

Applications

Microprocessor Bus Interface	Legacy Peripheral Bridging
Use Scenario: Interfacing an 8-bit microprocessor data bus to external memory or I/O devices with different timing or drive requirements. IC Role / Device Role / Timing Role: Bidirectional data buffer with latch-controlled handshaking - isolates CPU bus during memory access cycles and holds data stable for slower peripherals. Use Value: Eliminates need for discrete latch + transceiver combinations; reduces PCB area and signal skew via integrated dual-path timing control.	Use Scenario: Connecting modern controller boards to legacy parallel port peripherals (e.g., printers, industrial sensors) using TTL-level signaling. IC Role / Device Role / Timing Role: Level- and drive-capacity translator - adapts low-drive system bus to high-sink legacy device inputs while maintaining timing integrity. Use Value: Enables direct connection without external pull-ups or driver transistors, leveraging B-side's 64 mA sink to meet legacy device VIH/VIL load specs.
Industrial Control Backplane	Test Equipment Data Capture
Use Scenario: Isolating and buffering data across modular backplane slots where modules may power up asynchronously. IC Role / Device Role / Timing Role: Hot-swap-safe bidirectional transceiver - 3-state outputs prevent bus contention during module insertion/removal. Use Value: Prevents data corruption during live backplane reconfiguration; OEAB/OEBA allow per-slot output disable before power sequencing completes.	Use Scenario: Capturing parallel digital waveforms from DUTs in automated test systems with precise timing alignment. IC Role / Device Role / Timing Role: Synchronized data sampler - LEAB/LEBA edges align with test clock to latch parallel samples into stable registers before readout. Use Value: Provides deterministic setup/hold margins (≥3 ns) and sub-9 ns propagation, enabling reliable sampling at >100 MSPS equivalent rates.

Microprocessor Bus Interface

Legacy Peripheral Bridging

Use Scenario: Interfacing an 8-bit microprocessor data bus to external memory or I/O devices with different timing or drive requirements.

IC Role / Device Role / Timing Role: Bidirectional data buffer with latch-controlled handshaking - isolates CPU bus during memory access cycles and holds data stable for slower peripherals.

Use Value: Eliminates need for discrete latch + transceiver combinations; reduces PCB area and signal skew via integrated dual-path timing control.

Use Scenario: Connecting modern controller boards to legacy parallel port peripherals (e.g., printers, industrial sensors) using TTL-level signaling.

IC Role / Device Role / Timing Role: Level- and drive-capacity translator - adapts low-drive system bus to high-sink legacy device inputs while maintaining timing integrity.

Use Value: Enables direct connection without external pull-ups or driver transistors, leveraging B-side's 64 mA sink to meet legacy device VIH/VIL load specs.

Industrial Control Backplane

Test Equipment Data Capture

Use Scenario: Isolating and buffering data across modular backplane slots where modules may power up asynchronously.

IC Role / Device Role / Timing Role: Hot-swap-safe bidirectional transceiver - 3-state outputs prevent bus contention during module insertion/removal.

Use Value: Prevents data corruption during live backplane reconfiguration; OEAB/OEBA allow per-slot output disable before power sequencing completes.

Use Scenario: Capturing parallel digital waveforms from DUTs in automated test systems with precise timing alignment.

IC Role / Device Role / Timing Role: Synchronized data sampler - LEAB/LEBA edges align with test clock to latch parallel samples into stable registers before readout.

Use Value: Provides deterministic setup/hold margins (≥3 ns) and sub-9 ns propagation, enabling reliable sampling at >100 MSPS equivalent rates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74F541DW	Unidirectional (A→B only); no B→A latch path or CEBA/LEBA/OEBA inputs.	Suitable only for one-way data transfer; cannot replace bidirectional functionality of SN74F543DWR.	Select only if system design uses separate unidirectional paths and does not require concurrent A↔B staging.
SN74F245N	Octal bus transceiver with single-direction control (DIR pin); no independent latch-enable per direction.	Lacks per-path storage - data passes through transparently; no hold capability for asynchronous handshaking.	Choose when simple direction-controlled pass-through suffices and latch-based buffering is unnecessary.

Compared with SN74F543DWR, SN74F541DW omits reverse-path logic entirely, while SN74F245N replaces dual-latch control with a single DIR pin and no storage - both lack the independent A↔B staging capability essential for synchronized bidirectional bus arbitration.

Availability

SN74F543DWR is available at Aetrix Electronics and suitable for microprocessor bus interface, legacy peripheral bridging, industrial control backplane, and test equipment data capture applications requiring stable component supply and long-term commercial-temperature support.

Supply support for SN74F543DWR 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 SN74F543DWR belongs to TI's 74F family of fast TTL logic devices, designed specifically for high-speed, low-latency digital interface applications in commercial-temperature embedded systems and legacy-compatible hardware.

FAQ

What is the maximum sink current supported by the B-side outputs of SN74F543DWR?

The B-side outputs (B1–B8) of SN74F543DWR are characterized to sink up to 64 mA per pin under recommended operating conditions (V_CC = 4.5 V, I_OL = 64 mA). This rating is validated per TI's SDFS025B datasheet and enables direct driving of higher-current loads such as LEDs, relay coils, or legacy TTL inputs without external buffers. Exceeding this limit risks output degradation or thermal overstress in SN74F543DWR.

Does SN74F543DWR support true bidirectional data flow with independent storage per direction?

Yes, SN74F543DWR implements two fully independent D-type latch sets - one for A-to-B and one for B-to-A - each with dedicated CE, LE, and OE inputs. This architecture allows simultaneous storage and release of data in both directions, enabling true bidirectional handshake protocols without interference. The function table and logic diagram in the SN74F543DWR datasheet confirm separate control paths and non-overlapping timing behavior.

What is the operating temperature range specified for SN74F543DWR?

SN74F543DWR is characterized for operation from 0°C to 70°C, consistent with commercial-grade TTL logic. This range is explicitly stated in the "recommended operating conditions" and "absolute maximum ratings" sections of the official TI datasheet (SDFS025B). It is not rated for extended or industrial temperature ranges, and operation outside 0°C–70°C may result in undefined timing or electrical behavior in SN74F543DWR.

Can SN74F543DWR be used as a drop-in replacement for SN74F543DW?

Yes - SN74F543DWR is the tape-and-reel version of the same SOIC-24 (DW) packaged device as SN74F543DW, with identical pinout, electrical specifications, and timing behavior. TI's packaging addendum confirms both share DW package drawing, 24-pin count, 0°C–70°C rating, and NIPDAU lead finish. SN74F543DWR is actively produced and recommended for new designs where automated placement is required.

What logic family does SN74F543DWR belong to, and what are its key voltage thresholds?

SN74F543DWR belongs to the 74F (Fairchild TTL-compatible) logic family. Its input thresholds are V_IL ≤ 0.8 V (max) and V_IH ≥ 2.0 V (min) at V_CC = 4.5–5.5 V, ensuring compatibility with standard TTL and LSTTL sources. Output levels meet VOH ≥ 2.4 V (at I_OH = –3 mA for A-side) and VOL ≤ 0.55 V (at I_OL = 64 mA for B-side), as verified in the SN74F543DWR electrical characteristics table.

SN74F543DWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74F

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

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:: 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:: 24-SOIC

SN74F543DWR FAQ

1.How can I place an order for SN74F543DWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74F543DWR 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 SN74F543DWR reliable?

The price and inventory of SN74F543DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F543DWR is usually 5 days.

3.What payment methods are accepted for SN74F543DWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F543DWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74F543DWR?

SN74F543DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74F543DWR 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 SN74F543DWR?

For technical support, including SN74F543DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F543DWR requirements.

6.How does Aetrix verify that SN74F543DWR is sourced from the original manufacturer or authorized distributors?

All SN74F543DWR 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 SN74F543DWR meets industry standards.

7.What is the process for return or replacement of SN74F543DWR?

All SN74F543DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74F543DWR, 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 SN74F543DWR part is unused and in its original packaging.

Return procedure for SN74F543DWR:

1.Submit a request within 90 days.

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

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