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Texas Instruments SN74LVCH245DBLE

Name: SN74LVCH245DBLE
Brand: Texas Instruments
SKU: SN74LVCH245DBLE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVCH245DBLE

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74LVCH245DBLE.pdf

Description:: BUS TRANSCEIVER

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Product details

Overview

SN74LVCH245DBLE from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for 2.7-V to 3.6-V V_CC operation and mixed-mode signal interfacing (5-V I/O with 3.3-V V_CC). It supports bidirectional data flow between A and B buses under DIR control, features bus-hold on all data inputs, and operates across –40°C to 85°C. Used in level-shifting backplane interfaces and isolated bus domains.

For engineers reviewing the SN74LVCH245DBLE datasheet, SN74LVCH245DBLE pinout, SN74LVCH245DBLE application, or SN74LVCH245DBLE equivalent, key selection criteria include 3-state output isolation timing (t_dis ≤ 8.5 ns at 2.7 V), bus-hold functionality eliminating external pullups, ±24-mA drive strength at 3 V, and absolute input voltage tolerance up to 5.5 V.

Technical Context

The SN74LVCH245DBLE implements asynchronous bidirectional data routing using a single DIR input to select direction (A→B or B→A) and an active-low OE input to enable/disable all outputs into high-impedance state. Its EPIC™ submicron CMOS process ensures low ground bounce (V_OLP < 0.8 V) and undershoot (V_OHV > 2 V) at 3.3 V.

Bus-hold circuitry actively maintains valid logic levels on floating A1–A8 and B1–B8 inputs without external components. The device supports hot-insertion scenarios due to overvoltage-tolerant inputs (–0.5 V to 6.5 V) and robust ESD protection (>2000 V HBM, >200 V MM).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - Enables stable operation in 3.3-V systems while tolerating supply variation during brownout or startup.
I/O Voltage Tolerance	0 V to 5.5 V on all data pins - Allows direct connection to 5-V buses without level shifters.
Output Drive	±24 mA at V_CC = 3 V - Sufficient to drive standard TTL loads and moderate capacitive bus stubs.
t_pd Propagation Delay	1.5 ns (min) to 7 ns (max) at 3.3 V - Supports high-speed bus handshaking in real-time control applications.
t_dis / t_en	1.5 ns (min) to 8.5 ns (max) at 2.7 V - Ensures fast bus isolation during mode switching or fault containment.
Bus-Hold Current	±75 µA at V_I = 2 V - Actively holds floating inputs at valid logic thresholds, preventing metastability.
ESD Rating	>2000 V HBM, >200 V MM - Reduces risk of field failure in handling and assembly environments.

Pinout & Package

SN74LVCH245DBLE uses a 20-pin SSOP (Shrink Small-Outline Package) with 0.65-mm lead pitch, JEDEC MO-153 compliant. Package dimensions: 7.2 mm × 5.3 mm × 1.95 mm (L × W × H), body height 1.75 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 DIR	Direction Control Input	Low = B→A data transfer; High = A→B data transfer - Determines real-time bus flow direction without latch or clock.
2–9 A1–A8	Data Inputs/Outputs (Port A)	Bidirectional I/O with bus-hold - Retains last valid logic state when un-driven; compatible with 5-V signaling.
10 GND	Ground Reference	Primary return path for all internal logic and I/O current - Must be low-inductance connected to system ground plane.
11 V_CC	Supply Voltage	2.7–3.6 V core power - Powers internal logic and output drivers; decoupling capacitor required near pin.
12–19 B1–B8	Data Inputs/Outputs (Port B)	Bidirectional I/O with bus-hold - Electrically identical to A-port; enables symmetric interconnection between heterogeneous buses.
20 OE	Output Enable (Active-Low)	Low = outputs enabled; High = all outputs in high-Z - Used for bus arbitration and multi-drop isolation.

Key Features

Feature	Design Value
Mixed-Mode Signal Operation	5-V-tolerant I/O with 3.3-V V_CC - Eliminates need for external level translators in 3.3-V controller ↔ 5-V peripheral interfaces.
Integrated Bus-Hold Circuitry	Self-biasing on all 16 data lines - Removes requirement for 16 external pullup/pulldown resistors, reducing BOM count and board space.
Low Ground Bounce & Undershoot	V_OLP < 0.8 V and V_OHV > 2 V at 3.3 V - Minimizes noise coupling into adjacent signals during simultaneous switching.
High-Speed 3-State Switching	t_dis ≤ 8.5 ns (2.7 V), t_en ≤ 9.5 ns (2.7 V) - Enables rapid bus sharing in time-critical multiprocessor or DMA architectures.
Robust Absolute Ratings	Input/output voltage range –0.5 V to 6.5 V - Supports safe operation during hot-plug events and transient overvoltage conditions.

Applications

Industrial PLC Backplane Interface	Embedded Microcontroller Expansion Bus
Use Scenario: Interfacing a 3.3-V ARM Cortex-M7 MCU to legacy 5-V I/O modules via parallel backplane. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver enabling synchronous data exchange between mismatched voltage domains. Use Value: Eliminates discrete level shifters and pullup networks, reducing component count by ≥18 parts per interface while maintaining <10-ns timing margin.	Use Scenario: Expanding GPIO count of a 3.3-V SoC using off-chip 5-V peripheral ICs (e.g., ADCs, DACs, display drivers). IC Role / Device Role / Timing Role: Direction-controlled data bridge with bus-hold, allowing dynamic read/write access without external bus controllers. Use Value: Enables hot-swappable peripheral modules by sustaining valid logic states during insertion/removal, preventing bus contention.
Automotive Body Control Module (BCM)	Test Equipment Digital I/O Subsystem
Use Scenario: Isolating CAN microcontroller I/O from 5-V sensor interface circuits in a 12-V vehicle electrical environment. IC Role / Device Role / Timing Role: Fault-isolated bus transceiver with fast 3-state disable for fail-safe shutdown during overvoltage detection. Use Value: Meets automotive EMC requirements via low ground bounce and supports ISO 11898-compliant signal integrity with minimal added noise.	Use Scenario: Configurable digital stimulus/response channel in automated test equipment connecting FPGA-based pattern generators to DUTs with mixed-voltage logic. IC Role / Device Role / Timing Role: Programmable-direction buffer supporting both sourcing and sinking modes under software control. Use Value: Reduces test fixture complexity by replacing two unidirectional buffers per channel, cutting PCB layer count and test head cabling.

Industrial PLC Backplane Interface

Embedded Microcontroller Expansion Bus

Use Scenario: Interfacing a 3.3-V ARM Cortex-M7 MCU to legacy 5-V I/O modules via parallel backplane.

IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver enabling synchronous data exchange between mismatched voltage domains.

Use Value: Eliminates discrete level shifters and pullup networks, reducing component count by ≥18 parts per interface while maintaining <10-ns timing margin.

Use Scenario: Expanding GPIO count of a 3.3-V SoC using off-chip 5-V peripheral ICs (e.g., ADCs, DACs, display drivers).

IC Role / Device Role / Timing Role: Direction-controlled data bridge with bus-hold, allowing dynamic read/write access without external bus controllers.

Use Value: Enables hot-swappable peripheral modules by sustaining valid logic states during insertion/removal, preventing bus contention.

Automotive Body Control Module (BCM)

Test Equipment Digital I/O Subsystem

Use Scenario: Isolating CAN microcontroller I/O from 5-V sensor interface circuits in a 12-V vehicle electrical environment.

IC Role / Device Role / Timing Role: Fault-isolated bus transceiver with fast 3-state disable for fail-safe shutdown during overvoltage detection.

Use Value: Meets automotive EMC requirements via low ground bounce and supports ISO 11898-compliant signal integrity with minimal added noise.

Use Scenario: Configurable digital stimulus/response channel in automated test equipment connecting FPGA-based pattern generators to DUTs with mixed-voltage logic.

IC Role / Device Role / Timing Role: Programmable-direction buffer supporting both sourcing and sinking modes under software control.

Use Value: Reduces test fixture complexity by replacing two unidirectional buffers per channel, cutting PCB layer count and test head cabling.

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	No bus-hold; requires external pullups on unused inputs; slightly lower drive (±24 mA at 3.3 V vs. ±24 mA at 3 V).	Lacks inherent floating-input immunity - unsuitable where connectors or long traces increase risk of noise-induced glitches.	Select SN74LVC245A only if cost sensitivity outweighs reliability needs and board layout allows dedicated pullup routing.
74ALVC245	Faster propagation (t_pd ≤ 3.3 ns at 3.3 V); higher ICC (500 µA typical); no bus-hold; narrower V_CC range (2.3–3.6 V).	Better suited for ultra-low-latency interconnects but less tolerant of supply droop or floating nodes in industrial settings.	Choose 74ALVC245 when sub-4-ns timing is mandatory and bus-hold is managed elsewhere in system design.

Compared with SN74LVC245A and 74ALVC245, the SN74LVCH245DBLE uniquely combines bus-hold, 5-V-tolerant I/O, and robust ESD in a single 20-pin SSOP package - making it optimal for ruggedized, low-BOM-count embedded interfaces where input stability and mixed-voltage interoperability are critical.

Availability

SN74LVCH245DBLE is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and embedded microcontroller expansion buses requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature extremes.

Supply support for SN74LVCH245DBLE 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 founded in 1930, specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVCH245DBLE belongs to TI's LVCH logic family, engineered for mixed-signal interoperability in resource-constrained embedded systems where voltage translation, bus isolation, and input stability must coexist without external components.

FAQ

What is the operating temperature range for the SN74LVCH245DBLE?

The SN74LVCH245DBLE is characterized for operation from –40°C to +85°C ambient temperature. This full industrial temperature range ensures reliable performance in harsh environments such as factory automation controls, automotive under-hood modules, and outdoor communication equipment where thermal cycling is common. All electrical specifications in the datasheet apply across this range unless otherwise noted.

Does the SN74LVCH245DBLE require external pullup resistors on its data inputs?

No, the SN74LVCH245DBLE does not require external pullup resistors on A1–A8 or B1–B8 inputs because it integrates active bus-hold circuitry. This feature maintains each data input at its last-valid logic level when left floating, eliminating risk of metastability and reducing BOM count. External resistors are unnecessary unless specific biasing beyond bus-hold strength is needed.

Can the SN74LVCH245DBLE interface between a 3.3-V microcontroller and a 5-V peripheral?

Yes, the SN74LVCH245DBLE supports mixed-mode signal operation: its data inputs and outputs tolerate up to 5.5 V regardless of V_CC, while operating from a 2.7–3.6-V supply. This allows direct connection between a 3.3-V MCU and 5-V peripherals without external level shifters - a key capability confirmed in the device's functional description and absolute maximum ratings.

What is the recommended power-up sequence for the SN74LVCH245DBLE?

To ensure outputs remain in high-impedance state during power-up, tie OE to V_CC through a pullup resistor. The minimum resistor value depends on the driver's current-sinking capability - typically 4.7 kΩ suffices for most microcontroller GPIOs. DIR may be left floating only if bus-hold guarantees a known initial state; otherwise, tie it to V_CC or GND.

How does the SN74LVCH245DBLE handle simultaneous switching noise (SSN)?

The SN74LVCH245DBLE minimizes SSN via EPIC™ submicron CMOS process enhancements: typical output ground bounce (V_OLP) is < 0.8 V and output undershoot (V_OHV) exceeds 2 V at V_CC = 3.3 V and T_A = 25°C. These values reduce coupled noise into adjacent signal lines and power rails, improving signal integrity in dense PCB layouts.

SN74LVCH245DBLE Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVCH

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74LVCH245DBLE FAQ

1.How can I place an order for SN74LVCH245DBLE through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVCH245DBLE 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 SN74LVCH245DBLE reliable?

The price and inventory of SN74LVCH245DBLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245DBLE is usually 5 days.

3.What payment methods are accepted for SN74LVCH245DBLE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCH245DBLE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVCH245DBLE?

SN74LVCH245DBLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVCH245DBLE 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 SN74LVCH245DBLE?

For technical support, including SN74LVCH245DBLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245DBLE requirements.

6.How does Aetrix verify that SN74LVCH245DBLE is sourced from the original manufacturer or authorized distributors?

All SN74LVCH245DBLE 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 SN74LVCH245DBLE meets industry standards.

7.What is the process for return or replacement of SN74LVCH245DBLE?

All SN74LVCH245DBLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245DBLE, 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 SN74LVCH245DBLE part is unused and in its original packaging.

Return procedure for SN74LVCH245DBLE:

1.Submit a request within 90 days.

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

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