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Texas Instruments SN74LVTH245APWRG4

Name: SN74LVTH245APWRG4
Brand: Texas Instruments
SKU: SN74LVTH245APWRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH245APWRG4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74LVTH245APWRG4.pdf

Description:: IC TXRX NON-INVERT 3.6V 20TSSOP

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Product details

Overview

SN74LVTH245APWRG4 from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 3.3-V and 5-V buses. It supports mixed-mode signal operation (5-V inputs/outputs with 3.3-V V_CC), delivers ±64 mA output drive at 3 V, and features bus-hold circuitry eliminating external pullup/pulldown resistors - used in industrial backplane interfaces and legacy system voltage translation.

For engineers reviewing the SN74LVTH245APWRG4 datasheet, SN74LVTH245APWRG4 pinout, SN74LVTH245APWRG4 application, or SN74LVTH245APWRG4 equivalent, key selection criteria include its I_off-enabled hot-insertion support, 2.7–3.6 V supply range, 3.5 ns typical propagation delay, and TSSOP-20 package compatibility with space-constrained PCB layouts.

Technical Context

This device implements an ABT (Advanced BiCMOS Technology) architecture to achieve high-speed, low-noise bus interfacing while maintaining TTL-compatible input thresholds and 5-V tolerant I/O. Its dual-bus structure enables configurable direction control via DIR and output isolation via OE, supporting both A→B and B→A data flow under logic-level supervision.

The integrated bus-hold circuitry actively maintains valid logic states on floating A/B port inputs without external components, and the power-up 3-state feature ensures outputs remain high-impedance during power ramp-up - critical for preventing bus contention in multi-voltage systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional degradation.
I_OL / I_OH	64 mA sink / −32 mA source at V_CC = 3 V - drives standard TTL loads directly without buffer amplification.
t_PLH/t_PHL	2.3 ns / 2.1 ns typical (V_CC = 3.3 V, C_L = 50 pF) - enables >200 MHz bus toggle rates in point-to-point configurations.
Bus-Hold Current	±750 μA dynamic hold current (V_CC = 3.6 V) - reliably sustains logic state on unterminated data lines.
I_off	±100 μA max at V_CC = 0 V - prevents damaging backflow current during hot insertion or partial power-down.
V_I Tolerance	−0.5 V to 7 V input voltage range - accepts 5-V signals safely while powered from 3.3-V rail.
ESD Rating	2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115 for robust handling in manufacturing and field environments.

Pinout & Package

TSSOP-20 package (PW), 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, exposed thermal pad optional per design. RoHS-compliant NiPdAu lead finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	A-side data inputs/outputs	Bidirectional I/O ports connected to A bus; driven by internal transceiver core when enabled.
9	DIR (Direction Control)	Active-high logic input: HIGH routes A→B, LOW routes B→A; no internal pullup.
10	GND	Ground reference for all internal circuitry and I/O buffers.
11, 12, 13, 14, 15, 16, 17, 18	B-side data inputs/outputs	Bidirectional I/O ports connected to B bus; functionally mirrored to A pins.
19	OE (Output Enable)	Active-low enable: LOW enables transceiver, HIGH forces all A/B outputs into high-impedance state.
20	V_CC	3.3-V supply input; must be decoupled locally with ≥0.1 μF ceramic capacitor.

Key Features

Feature	Design Value
Mixed-mode 5-V/3.3-V interface	Accepts 5-V inputs and drives 5-V loads while operating from 3.3-V V_CC, enabling seamless interoperation between legacy and modern logic families.
Integrated bus-hold circuitry	Eliminates need for external pullup/pulldown resistors on A/B data lines - reduces BOM count and board area in high-pin-count bus designs.
I_off and power-up 3-state	Prevents current backflow during power-off and ensures outputs stay high-Z during power sequencing - essential for hot-swap backplane applications.
Low ground bounce (V_OLP)	<0.8 V typical at V_CC = 3.3 V - minimizes noise coupling into shared ground planes in dense digital systems.
Latch-up immunity	>500 mA per JESD17 - ensures robust operation under transient overvoltage or ESD stress without destructive latch-up.

Applications

Industrial Backplane Interface	Legacy System Voltage Translation
Use Scenario: Interfacing a 3.3-V FPGA-based controller to a 5-V ISA-style peripheral bus in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow direction via FPGA-controlled DIR and OE signals. Use Value: Enables direct connection without discrete level shifters or voltage translators, reducing component count and signal path delay.	Use Scenario: Upgrading aging test equipment with 5-V TTL logic to use modern 3.3-V microcontrollers while retaining existing 5-V sensor interfaces. IC Role / Device Role / Timing Role: Voltage-tolerant bus bridge isolating MCU I/O from legacy 5-V peripherals during read/write cycles. Use Value: Maintains full 5-V signal integrity on sensor side while operating from MCU's 3.3-V supply, avoiding signal degradation or timing skew.
Hot-Swappable Module Communication	Embedded Data Acquisition Bus
Use Scenario: Slot-based modular instrumentation where daughterboards are inserted/removed while main chassis remains powered. IC Role / Device Role / Timing Role: Isolation element using I_off and power-up 3-state to prevent bus conflicts during insertion/removal events. Use Value: Guarantees zero current injection into live backplane during hot-swap, meeting IEC 61000-4-2 and system safety requirements.	Use Scenario: Multi-channel analog front-end board where ADCs and DACs operate at 5-V logic levels but are controlled by a 3.3-V ARM Cortex-M4 processor. IC Role / Device Role / Timing Role: Synchronous data bus extender synchronizing parallel ADC output reads and DAC command writes across voltage domains. Use Value: Delivers sub-4 ns propagation delay and bus-hold stability, preserving timing margins in real-time acquisition loops up to 25 MHz.

Industrial Backplane Interface

Legacy System Voltage Translation

Use Scenario: Interfacing a 3.3-V FPGA-based controller to a 5-V ISA-style peripheral bus in programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow direction via FPGA-controlled DIR and OE signals.

Use Value: Enables direct connection without discrete level shifters or voltage translators, reducing component count and signal path delay.

Use Scenario: Upgrading aging test equipment with 5-V TTL logic to use modern 3.3-V microcontrollers while retaining existing 5-V sensor interfaces.

IC Role / Device Role / Timing Role: Voltage-tolerant bus bridge isolating MCU I/O from legacy 5-V peripherals during read/write cycles.

Use Value: Maintains full 5-V signal integrity on sensor side while operating from MCU's 3.3-V supply, avoiding signal degradation or timing skew.

Hot-Swappable Module Communication

Embedded Data Acquisition Bus

Use Scenario: Slot-based modular instrumentation where daughterboards are inserted/removed while main chassis remains powered.

IC Role / Device Role / Timing Role: Isolation element using I_off and power-up 3-state to prevent bus conflicts during insertion/removal events.

Use Value: Guarantees zero current injection into live backplane during hot-swap, meeting IEC 61000-4-2 and system safety requirements.

Use Scenario: Multi-channel analog front-end board where ADCs and DACs operate at 5-V logic levels but are controlled by a 3.3-V ARM Cortex-M4 processor.

IC Role / Device Role / Timing Role: Synchronous data bus extender synchronizing parallel ADC output reads and DAC command writes across voltage domains.

Use Value: Delivers sub-4 ns propagation delay and bus-hold stability, preserving timing margins in real-time acquisition loops up to 25 MHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC245A	Lower drive strength (24 mA sink), no bus-hold, 1.65–3.6 V V_CC range - lacks 5-V input tolerance and hot-insertion support.	Suitable only for pure 3.3-V or lower-voltage systems without legacy 5-V interface requirements.	Select when cost and power efficiency outweigh mixed-voltage capability and robustness needs.
SN74ALVC245	Higher speed (t_PD ≈ 2.0 ns), 1.65–3.6 V operation, no bus-hold, no I_off - optimized for low-voltage, high-frequency designs only.	Applicable in compact portable electronics where 5-V compatibility is unnecessary and layout space is constrained.	Choose for ultra-low-power, high-speed 3.3-V-only buses where TI's ABT family's robustness features are not required.

Compared with SN74LVC245A and SN74ALVC245, the SN74LVTH245APWRG4 uniquely combines 5-V input tolerance, bus-hold, I_off, and hot-insertion readiness - making it the only option among the three qualified for mixed-voltage industrial backplanes requiring field-serviceability and legacy interoperability.

Availability

SN74LVTH245APWRG4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for SN74LVTH245APWRG4 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 connectivity technologies, with decades of experience in industrial-grade logic and interface solutions.

The SN74LVTH245A product line was engineered specifically for robust voltage-domain bridging in mission-critical industrial and instrumentation systems - emphasizing reliability, mixed-signal interoperability, and hot-swap readiness over raw speed.

FAQ

What is the maximum recommended operating temperature for SN74LVTH245APWRG4?

The SN74LVTH245APWRG4 is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory-floor PLCs, outdoor test gear, and enclosed embedded systems without forced cooling. Thermal derating is not required within this envelope when mounted per JEDEC J-STD-020 guidelines for TSSOP packages.

Does SN74LVTH245APWRG4 require external pullup resistors on its A/B data lines?

No - the SN74LVTH245APWRG4 integrates active bus-hold circuitry on all A and B port inputs, which maintains valid logic states on floating lines without external pullup or pulldown resistors. Using external resistors with bus-hold enabled is explicitly discouraged in the datasheet, as it may cause excessive current draw or logic instability.

Can SN74LVTH245APWRG4 be used in hot-swap applications?

Yes - the SN74LVTH245APWRG4 supports hot insertion via two complementary features: I_off circuitry disables outputs when V_CC = 0 V, preventing backflow current, and power-up 3-state ensures outputs remain high-impedance during power ramp-up. These features are production-tested and meet JEDEC JESD78 latch-up and JESD22 reliability standards.

What is the pin 1 marking convention for SN74LVTH245APWRG4 in TSSOP packaging?

The SN74LVTH245APWRG4 uses standard TSSOP orientation: pin 1 is located at the top-left corner of the package, identified by a small circular indentation or beveled edge on the top surface near the leadframe. The part marking "LXH245A" appears adjacent to pin 1, consistent with TI's TSSOP-20 tape-and-reel labeling specification.

Is SN74LVTH245APWRG4 compatible with 5-V CMOS logic inputs?

Yes - the SN74LVTH245APWRG4 accepts input voltages up to 7 V (absolute maximum) and is fully specified for 5-V TTL-compatible inputs. Its VIH threshold is 2.0 V minimum, and VIL is 0.8 V maximum, ensuring reliable recognition of standard 5-V CMOS logic levels while powered from 3.3 V.

SN74LVTH245APWRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

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:: 32mA, 64mA

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

SN74LVTH245APWRG4 FAQ

1.How can I place an order for SN74LVTH245APWRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH245APWRG4 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 SN74LVTH245APWRG4 reliable?

The price and inventory of SN74LVTH245APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH245APWRG4 is usually 5 days.

3.What payment methods are accepted for SN74LVTH245APWRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH245APWRG4 transactions.

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4.How is shipping managed for SN74LVTH245APWRG4?

SN74LVTH245APWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH245APWRG4 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 SN74LVTH245APWRG4?

For technical support, including SN74LVTH245APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH245APWRG4 requirements.

6.How does Aetrix verify that SN74LVTH245APWRG4 is sourced from the original manufacturer or authorized distributors?

All SN74LVTH245APWRG4 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 SN74LVTH245APWRG4 meets industry standards.

7.What is the process for return or replacement of SN74LVTH245APWRG4?

All SN74LVTH245APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH245APWRG4, 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 SN74LVTH245APWRG4 part is unused and in its original packaging.

Return procedure for SN74LVTH245APWRG4:

1.Submit a request within 90 days.

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

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