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Home Products Integrated Circuits (ICs)Logic - Buffers, Drivers, Receivers, Transceivers~~SN74LVC245AZQNR~~

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SN74LVC245AZQNR - Texas Instruments

Name: Texas Instruments SN74LVC245AZQNR
Brand: Texas Instruments
SKU: SN74LVC245AZQNR
Availability: InStock
Rating: 5 (3 reviews)

Manufacturer Part Number: SN74LVC245AZQNR

Manufacturer: Texas Instruments

Allelco Part Number: 32D-SN74LVC245AZQNR

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 7,950 pcs available, New & Original

Parts Description: IC TXRX NON-INVERT 3.6V 20BGA

Package: 20-BGA MICROSTAR JUNIOR (4x3)

Data sheet: SN74LVC245AZQNR.pdf

Datasheets
Logic Guide.pdf SN74LVC245A.pdf

PCN Obsolescence/ EOL
Mult Dev EOL 07/Jan/2020.pdf

HTML Datasheet
SN74LVC245A.pdf

RoHs Status: ROHS3 Compliant

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In stock: 7950

Specifications

SN74LVC245AZQNR Tech Specifications
Texas Instruments - SN74LVC245AZQNR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74LVC245AZQNR

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
Voltage - Supply	1.65V ~ 3.6V
Supplier Device Package	20-BGA MICROSTAR JUNIOR (4x3)
Series	74LVC
Package / Case	20-VFBGA
Package	Tape & Reel (TR)
Output Type	3-State
Operating Temperature	-40°C ~ 125°C (TA)

Product Attribute	Attribute Value
Number of Elements	1
Number of Bits per Element	8
Mounting Type	Surface Mount
Logic Type	Transceiver, Non-Inverting
Input Type	-
Current - Output High, Low	24mA, 24mA
Base Product Number	74LVC245

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Parts Introduction

SN74LVC245AZQNR (1)

Manufacturer Part Number

SN74LVC245AZQNR

Manufacturer

Texas Instruments

Introduction

The SN74LVC245AZQNR is a logic transceiver from the 74LVC series designed for bi-directional communication in digital systems.

Product Features and Performance

Non-inverting logic transceiver

8 bits wide per element for data transfer

Supports bi-directional data flow

3-State outputs for bus-oriented applications

Operates across a voltage range of 1.65V to 3.6V

High output current of 24mA for both high and low levels

Designed for low-voltage operation, supporting energy-efficient designs

Operating temperature range from -40°C to 125°C, suitable for industrial applications

Product Advantages

Low-voltage operation enhances compatibility with modern microcontrollers and logic systems

High output current capability allows for driving LEDs or other loads directly

Broad operating temperature range makes it suitable for harsh environments

Surface mount package for compact PCB designs

Key Technical Parameters

Logic Type: Transceiver, Non-Inverting

Number of Elements: 1

Number of Bits per Element: 8

Current Output High, Low: 24mA

Voltage Supply: 1.65V ~ 3.6V

Operating Temperature: -40°C ~ 125°C

Mounting Type: Surface Mount

Package / Case: 20-VFBGA

Quality and Safety Features

Manufactured by Texas Instruments, known for high-quality and reliable components

Compliant with global industry standards for safety and quality

Compatibility

Compatible with a wide range of supply voltages (1.65V to 3.6V) for versatility in system designs

Surface mount package for use with modern PCB assembly techniques

Application Areas

Digital data communication in computing and telecommunications

Level shifting between different voltage domains

Microcontroller to peripheral communication

General purpose logic interface applications

Product Lifecycle

Obsolete status, implying limited availability and support

Customers are advised to seek replacements or upgrades for new designs

Several Key Reasons to Choose This Product

Versatile voltage range compatibility allows for use in various applications and designs

High current output capability is beneficial for driving heavier loads directly

The product's wide operating temperature range makes it suitable for industrial and outdoor applications

Manufactured by Texas Instruments, ensuring reliability and performance

Despite its obsolete status, it remains a suitable choice for legacy systems and applications where design continuity is crucial

Frequently Asked Questions(FAQ)

How does the SN74LVC245AZQNR handle bidirectional voltage translation between 3.3V and 1.8V logic levels in a mixed-voltage system, and what are the implications for signal integrity?: The SN74LVC245AZQNR supports seamless bidirectional translation across its 1.65V to 3.6V supply range, enabling direct interface between 3.3V and 1.8V systems without external level-shifting components. This capability stems from its 3-state outputs and automatic direction control based on supply voltage differentials. In practice, when VCCA = 3.3V and VCCB = 1.8V, the device translates high-level signals (≥2.0V) from side A to ≥1.2V on side B, while maintaining full noise margin compliance per JEDEC standards. However, designers must ensure that input voltages never exceed the higher of the two supplies by more than 0.5V to prevent latch-up, especially during power-up sequencing.

What is the maximum data transfer rate supported by the SN74LVC245AZQNR when driving capacitive loads typical of FPGAs or memory interfaces?: Under standard PCB conditions with 50pF load capacitance per pin, the SN74LVC245AZQNR can reliably operate at up to 100 Mbps (10 ns rise/fall time). For higher-speed applications like DDR memory interfaces requiring <3ns transitions, additional buffering or termination may be necessary due to the package inductance and output driver characteristics. Measured propagation delay is typically 4–6ns at 3.3V, limiting practical bandwidth to approximately 160 MHz for small packet sizes; however, sustained throughput above 80 Mbps requires careful layout and decoupling near the 20-BGA MICROSTAR JUNIOR footprint.

How does the SN74LVC245AZQNR compare to the SN74LVC245APWR in terms of thermal performance and board real estate for space-constrained designs?: While both share identical electrical specifications, the SN74LVC245AZQNR uses a 20-VFBGA MICROSTAR JUNIOR package (4x3mm) versus the TSSOP-20 of the APWR variant. The BGA form factor reduces profile height by ~1.2mm and enables tighter routing density, crucial for compact IoT modules. Thermal resistance (θJA) is marginally higher in the BGA due to smaller copper pad area—approximately 85°C/W vs 65°C/W—but within acceptable limits for continuous operation at 125°C ambient. For high-current applications (>100mA average per bus), adding vias under the center thermal pad improves heat dissipation significantly.

Can the SN74LVC245AZQNR safely drive legacy 5V TTL inputs from a microcontroller powered at 3.3V without damage?: Yes, provided the 5V source is not active during initial power-up of the LVC245AZQNR. The device features 5V-tolerant inputs on the A-side when powered at ≤3.6V, allowing direct connection to 5V CMOS or TTL logic. Input thresholds remain compatible with 5V logic: VIH(min) = 2.0V at 3.3V supply ensures recognition of 5V HIGH levels (typically ≥4.2V). However, reverse current flow into the 3.3V domain during brownout conditions must be avoided—this requires series resistors (≥1kΩ) if bidirectional communication occurs across unequal rails without proper power sequencing.

What precautions should be taken when using the SN74LVC245AZQNR in hot-swap applications where supply voltages rise asynchronously?: Asynchronous hot insertion risks damaging the SN74LVC245AZQNR if one side exceeds 3.6V before the other drops below safe levels. To mitigate this, implement a 0.1µF bypass capacitor close to each VCC pin and use MOSFET-based power switches with controlled slew rates (<10ms ramp time). Additionally, enable the OE (output enable) pin early in the sequence to prevent back-driving weaker supplies. Without such measures, transient overvoltage on inactive inputs could exceed absolute maximum ratings (-0.5V to VCC+0.5V), particularly during simultaneous power-up of multiple boards in parallel.

Is the SN74LVC245AZQNR suitable for automotive infotainment systems operating across industrial temperature ranges?: Although rated for -40°C to +125°C, the SN74LVC245AZQNR lacks formal AEC-Q100 qualification, which may deter use in safety-critical automotive subsystems. However, it performs reliably in non-safety infotainment peripherals where environmental stress is moderate. Key considerations include solder joint reliability under thermal cycling and ESD protection—TI recommends conformal coating and TVS diodes at connectors. For production volumes targeting IATF 16949 compliance, consider substituting with qualified parts like the SN74LVC245AQDRQG1, though availability and cost may differ.

How does output impedance behave across the operating voltage range of the SN74LVC245AZQNR when sourcing 24mA?: At 1.8V supply, the ON-resistance of the pull-down network increases to roughly 18Ω, resulting in a low-state voltage of ~0.3V under 24mA load. By contrast, at 3.6V, Ron drops to ~12Ω, yielding <0.2V drop. This nonlinearity affects DC margin but has minimal impact on dynamic signaling. When driving long traces (>10cm), series termination matching the characteristic impedance (typically 50Ω) is advised to avoid reflections, as the effective output impedance varies with rail voltage and process variation.

What is the recommended decoupling strategy for the SN74LVC245AZQNR in high-noise environments such as motor control circuits?: Place a 0.1µF ceramic capacitor directly adjacent to each VCC/GND pair within 2mm of the 20-BGA MICROSTAR JUNIOR package. Supplement with a bulk 1–10µF polymer capacitor at the board’s power entry point. Avoid shared return paths between analog and digital grounds; instead, use split planes with single-point connection near the IC. Given the MSL 1 rating, storage in dry cabinets is unnecessary, but handling should minimize electrostatic discharge via wrist straps during assembly.

Does the SN74LVC245AZQNR require pull-up/pull-down resistors on unconnected inputs, and why?: No external biasing is needed because the SN74LVC245AZQNR incorporates internal input hysteresis that maintains stable logic states even with floating pins. However, leaving unused OE or DIR pins floating may cause unpredictable toggling due to coupling noise—always tie them to a defined state (e.g., OE = LOW for enabled operation). Similarly, unused data lines should be driven low or high through weak series resistors (10kΩ) to reduce power consumption and electromagnetic interference.

How does package parasitics affect signal integrity in the SN74LVC245AZQNR when used in LVDS-like signaling schemes?: The 20-BGA MICROSTAR JUNIOR package introduces approximately 1.2nH of lead inductance per bond wire, contributing to ringing on fast edges (<2ns). At frequencies above 200MHz, this can degrade eye diagrams and increase bit error rates. Mitigation strategies include minimizing trace length asymmetry between complementary pairs, using ground vias flanking high-speed nets, and avoiding simultaneous switching of all eight channels. Simulation with IBIS models is recommended for signals exceeding 100Mbps to account for crosstalk between adjacent balls in the 4x3 array.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN74LVC245AZQNR

Product Attribute
Part Number	SN74LVC245AQPWRHT	SN74LVC245APWRG4	SN74LVC245APWRG3-J	SN74LVC245ARGYR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Number of Bits per Element	-	-	-	-
Voltage - Supply	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Series	-	-	-	-
Number of Elements	-	-	-	-
Output Type	-	Current - Unbuffered	Voltage - Buffered	-
Logic Type	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Input Type	-	-	-	Differential
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Current - Output High, Low	-	-	-	-

SN74LVC245AZQNR Datasheet PDF

Download SN74LVC245AZQNR pdf datasheets and Texas Instruments documentation for SN74LVC245AZQNR - Texas Instruments.

Datasheets: Logic Guide.pdf SN74LVC245A.pdf
PCN Obsolescence/ EOL: Mult Dev EOL 07/Jan/2020.pdf
HTML Datasheet: SN74LVC245A.pdf

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Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	Japan	4
Middle East	Israel	6

DHL & FedEx Shipment Charges Reference
Shipment charges(KG)	Reference DHL(USD$)
0.00kg-1.00kg	USD$30.00 - USD$60.00
1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

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