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Texas Instruments SN74LVCH245ANS

Name: SN74LVCH245ANS
Brand: Texas Instruments
SKU: SN74LVCH245ANS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVCH245ANS

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN74LVCH245ANS.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74LVCH245ANS from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional data flow between A and B buses in mixed-voltage systems. It operates from 1.65 V to 3.6 V, accepts 5.5-V-tolerant inputs, and features bus-hold circuitry and I_off partial-power-down support. Used in industrial control backplanes and FPGA-to-ASIC interface bridging.

For engineers reviewing the SN74LVCH245ANS datasheet, SN74LVCH245ANS pinout, SN74LVCH245ANS application, or SN74LVCH245ANS equivalent, key selection criteria include its 20-pin SOIC (NS) package, 6.3 ns max propagation delay at 3.3 V, 3.6-V absolute maximum supply rating, and compatibility with 3.3-V/5-V mixed-signal environments.

Technical Context

This device implements dual-directional asynchronous bus translation via a single DIR control input and independent OE enable logic. Its bus-hold circuitry actively maintains valid logic levels on floating A/B port inputs without external resistors, and I_off protection disables outputs during power-down to prevent current backflow.

The transceiver supports true 5-V input tolerance while operating at V_CC as low as 1.65 V, enabling robust level-shifting between legacy 5-V peripherals and modern 3.3-V or 1.8-V logic domains. Propagation delay is specified down to 1.8 V operation, with t_pd = 7.3 ns (min) at V_CC = 1.8 V and 6.3 ns (max) at 3.3 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - Enables direct integration into low-voltage microcontroller and FPGA I/O domains without level-shifters.
Input Voltage Tolerance	Up to 5.5 V - Allows safe connection to 5-V legacy buses without clamping diodes or external protection.
t_pd (Max)	6.3 ns at V_CC = 3.3 V - Supports high-speed data transfer in real-time industrial communication links.
I_off	<±10 µA at V_I/V_O = 5.5 V - Prevents damaging back-current when V_CC is unpowered, critical for hot-swap systems.
Bus-Hold Current	±75 µA at V_I = 2 V (3 V V_CC) - Eliminates need for external pullup/pulldown resistors on unused data lines.
Output Drive	±24 mA at V_CC = 3 V - Sufficient to drive multiple CMOS loads or short PCB traces without buffering.
ESD Rating	2000-V HBM, 200-V MM - Meets industrial-grade ESD immunity requirements per JESD22.

Pinout & Package

SN74LVCH245ANS is supplied in a 20-pin plastic small-outline (SO) package (NS), 0.300-inch body width, JEDEC MO-150 compliant, with standard gull-wing lead form and RoHS-compliant CU NIPDAU finish.

Pin/Terminal	Circuit Role	Design Meaning
1	DIR	Direction control: Low = B→A, High = A→B; determines data flow path through internal transceiver core.
2–9	A1–A8	Port A data inputs/outputs - Connect to source bus (e.g., microcontroller side); driven by or drive A-side logic.
10	GND	Ground reference - Must be connected to system ground plane for stable noise margin and thermal performance.
11	V_CC	Supply voltage - Powers internal logic and output drivers; decoupling capacitor required within 1 cm.
12–19	B1–B8	Port B data inputs/outputs - Connect to destination bus (e.g., peripheral side); isolated when OE is high.
20	OE	Output enable: Low = active, High = 3-state - Controls global output driver enable/disable; tied to V_CC via pullup for power-up isolation.

Key Features

Feature	Design Value
Mixed-mode signal operation	5-V-tolerant inputs with 1.65–3.6-V V_CC enables seamless interfacing between 5-V legacy devices and 3.3-V/1.8-V logic without external translators.
Bus-hold circuitry	Active input retention eliminates external pullup/pulldown resistors on floating A/B pins, reducing BOM count and board space.
I_off partial-power-down	Outputs automatically disable and isolate when V_CC = 0 V, preventing back-current damage in multi-rail or hot-swap systems.
Low ground bounce (V_OLP)	<0.8 V at V_CC = 3.3 V - Minimizes switching noise coupling into shared ground paths in dense digital layouts.
High noise immunity	V_IL = 0.35×V_CC, V_IH = 0.65×V_CC at low V_CC - Ensures reliable logic detection across full supply range, including brownout conditions.

Applications

Industrial Backplane Interface	FPGA-to-Peripheral Bridging
Use Scenario: Connecting a 3.3-V FPGA I/O bank to legacy 5-V industrial sensors and actuators over a shared backplane bus. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction and isolating buses during configuration or fault events. Use Value: Eliminates discrete level-shifters and pullup networks, reducing component count by ≥4 parts per channel while maintaining 6.3-ns timing integrity.	Use Scenario: Interfacing a Xilinx Artix-7 FPGA's LVCMOS33 I/O to a 5-V RS-485 transceiver and EEPROM in a programmable logic controller. IC Role / Device Role / Timing Role: Octal bus transceiver providing controlled, 3-state-isolated data exchange between FPGA and mixed-voltage peripherals. Use Value: Enables single-chip voltage translation for all eight data lines, supporting simultaneous read/write operations without timing skew or bus contention.
Automotive Body Control Module	Test Equipment Signal Conditioning
Use Scenario: Isolating and translating signals between a 3.3-V MCU and 5-V CAN transceivers or LIN drivers in a vehicle body control unit. IC Role / Device Role / Timing Role: Direction-controlled bus buffer ensuring clean signal handoff and preventing backfeed during MCU reset or sleep modes. Use Value: I_off protection prevents battery drain during MCU deep-sleep states, meeting automotive quiescent current requirements (<100 µA).	Use Scenario: Conditioning parallel test signals between a 1.8-V pattern generator and 5-V DUT in automated test equipment (ATE) fixtures. IC Role / Device Role / Timing Role: High-speed, low-skew transceiver enabling repeatable signal edge alignment across all eight channels under varying load conditions. Use Value: 6.3-ns max t_pd and <1-ns output skew ensure sub-nanosecond timing correlation across channels for precision test vector delivery.

Industrial Backplane Interface

FPGA-to-Peripheral Bridging

Use Scenario: Connecting a 3.3-V FPGA I/O bank to legacy 5-V industrial sensors and actuators over a shared backplane bus.

IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction and isolating buses during configuration or fault events.

Use Value: Eliminates discrete level-shifters and pullup networks, reducing component count by ≥4 parts per channel while maintaining 6.3-ns timing integrity.

Use Scenario: Interfacing a Xilinx Artix-7 FPGA's LVCMOS33 I/O to a 5-V RS-485 transceiver and EEPROM in a programmable logic controller.

IC Role / Device Role / Timing Role: Octal bus transceiver providing controlled, 3-state-isolated data exchange between FPGA and mixed-voltage peripherals.

Use Value: Enables single-chip voltage translation for all eight data lines, supporting simultaneous read/write operations without timing skew or bus contention.

Automotive Body Control Module

Test Equipment Signal Conditioning

Use Scenario: Isolating and translating signals between a 3.3-V MCU and 5-V CAN transceivers or LIN drivers in a vehicle body control unit.

IC Role / Device Role / Timing Role: Direction-controlled bus buffer ensuring clean signal handoff and preventing backfeed during MCU reset or sleep modes.

Use Value: I_off protection prevents battery drain during MCU deep-sleep states, meeting automotive quiescent current requirements (<100 µA).

Use Scenario: Conditioning parallel test signals between a 1.8-V pattern generator and 5-V DUT in automated test equipment (ATE) fixtures.

IC Role / Device Role / Timing Role: High-speed, low-skew transceiver enabling repeatable signal edge alignment across all eight channels under varying load conditions.

Use Value: 6.3-ns max t_pd and <1-ns output skew ensure sub-nanosecond timing correlation across channels for precision test vector delivery.

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 circuitry; identical V_CC range and pinout but requires external pullups on unused inputs.	Suitable only where all inputs are actively driven; not recommended for systems with undriven or intermittently connected buses.	Select SN74LVC245A only if BOM cost reduction outweighs reliability risk from floating inputs.
SN74AVC245	Lower V_CC min (1.2 V), higher speed (t_pd = 3.2 ns), but no 5-V input tolerance - limited to ≤3.6-V domain translation.	Optimized for ultra-low-voltage SoC interconnects (e.g., 1.2-V/1.8-V), not mixed 3.3-V/5-V systems.	Choose SN74AVC245 only for sub-1.8-V designs requiring maximum speed; avoid for 5-V interface tasks.

Compared with SN74LVC245A and SN74AVC245, SN74LVCH245ANS uniquely combines 5-V input tolerance, integrated bus-hold, and I_off protection in a 20-pin SOIC package-making it the only option among the three qualified for robust, maintenance-free operation in mixed-voltage industrial backplanes.

Availability

SN74LVCH245ANS is available at Aetrix Electronics and suitable for industrial automation backplanes, FPGA peripheral interfaces, automotive body control modules, and test equipment signal conditioning requiring stable component supply and long-term lifecycle support.

Supply support for SN74LVCH245ANS 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 logic solutions, with decades of experience in high-reliability interface IC design.

SN74LVCH245ANS belongs to TI's LVC/LVCH logic family, engineered specifically for robust mixed-voltage system interfacing, bus isolation, and low-power industrial control applications.

FAQ

What is the maximum supply voltage for SN74LVCH245ANS?

The absolute maximum supply voltage (V_CC) for SN74LVCH245ANS is 6.5 V, but the recommended operating range is strictly 1.65 V to 3.6 V. Operation above 3.6 V may cause parametric degradation or reliability issues, even if within absolute ratings. The SN74LVCH245ANS is not rated for continuous 5-V V_CC operation.

Does SN74LVCH245ANS support hot-swap insertion?

Yes, SN74LVCH245ANS supports hot-swap via its I_off circuitry, which disables outputs and limits leakage to ±10 µA when V_CC = 0 V and inputs/outputs are biased up to 5.5 V. This prevents back-current damage during live insertion, provided OE is held high (via pullup) until V_CC stabilizes.

Can SN74LVCH245ANS drive a 50-pF load at 10 MHz?

Yes, SN74LVCH245ANS can drive a 50-pF load at 10 MHz. Its typical power dissipation capacitance (C_pd) is 47 pF per transceiver when enabled, and output drive strength (±24 mA at V_CC = 3 V) ensures adequate slew rate and signal integrity under that load condition, as verified in TI's switching characteristics tables.

Is bus-hold functionality enabled when OE is high?

Yes, bus-hold circuitry remains fully active regardless of OE or DIR state-it is part of the input stage and cannot be disabled. Even with OE = high (outputs in 3-state), unused A1–A8 or B1–B8 inputs are held at their last-valid logic level, eliminating floating-node risks in idle or powered-down configurations of SN74LVCH245ANS.

What is the pin-compatible replacement for SN74LVCH245ANS?

SN74LVCH245ANS has no pin-compatible drop-in replacement with identical bus-hold, I_off, and 5-V input tolerance. SN74LVC245ANS shares the same 20-pin SOIC (NS) footprint and pinout but lacks bus-hold and has different DC specs. Any substitution requires validation of input biasing, power sequencing, and noise immunity in the target SN74LVCH245ANS application.

SN74LVCH245ANS Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVCH

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:: 1.65V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

SN74LVCH245ANS FAQ

1.How can I place an order for SN74LVCH245ANS through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVCH245ANS 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 SN74LVCH245ANS reliable?

The price and inventory of SN74LVCH245ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245ANS is usually 5 days.

3.What payment methods are accepted for SN74LVCH245ANS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCH245ANS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVCH245ANS?

SN74LVCH245ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVCH245ANS 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 SN74LVCH245ANS?

For technical support, including SN74LVCH245ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245ANS requirements.

6.How does Aetrix verify that SN74LVCH245ANS is sourced from the original manufacturer or authorized distributors?

All SN74LVCH245ANS 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 SN74LVCH245ANS meets industry standards.

7.What is the process for return or replacement of SN74LVCH245ANS?

All SN74LVCH245ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245ANS, 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 SN74LVCH245ANS part is unused and in its original packaging.

Return procedure for SN74LVCH245ANS:

1.Submit a request within 90 days.

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

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