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Home Products Integrated Circuits (ICs)Logic - Buffers, Drivers, Receivers, Transceivers~~SN74LVC245AQPWRHT~~

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SN74LVC245AQPWRHT - Texas Instruments

Name: Texas Instruments SN74LVC245AQPWRHT
Brand: Texas Instruments
SKU: SN74LVC245AQPWRHT
Availability: InStock
Rating: 5 (10 reviews)

Manufacturer Part Number: SN74LVC245AQPWRHT

Manufacturer: Texas Instruments

Allelco Part Number: 98D-SN74LVC245AQPWRHT

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 12,698 pcs available, New & Original

Parts Description: PROTOTYPE

Package: 20-TSSOP

Data sheet: -

RoHs Status: ROHS3 Compliant

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In stock: 12698

Specifications

SN74LVC245AQPWRHT Tech Specifications
Texas Instruments - SN74LVC245AQPWRHT technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74LVC245AQPWRHT

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
Voltage - Supply	1.65V ~ 3.6V
Supplier Device Package	20-TSSOP
Series	74LVC
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Package	Bulk
Output Type	3-State

Product Attribute	Attribute Value
Operating Temperature	-40°C ~ 125°C (TA)
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

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant

Frequently Asked Questions(FAQ)

How does the SN74LVC245AQPWRHT handle signal directionality in a mixed-voltage system where the transmit and receive sides operate at different logic levels, and what design considerations are necessary to ensure reliable data transfer without level-shifting circuitry?: The SN74LVC245AQPWRHT functions as a bidirectional transceiver with automatic direction control based on the state of the DIR pin. In mixed-voltage systems—such as when the A-side operates at 3.3V and the B-side at 1.8V—the device supports voltage translation inherently due to its LVC family characteristics, which allow input thresholds to remain compatible across a wide range of supply voltages from 1.65V to 3.6V. This enables direct interfacing without external level shifters. However, designers must ensure that the direction control logic is stable before data transitions occur to avoid bus contention. Additionally, since both output drivers are 3-state controlled by the OE (output enable) pin, proper sequencing of OE and DIR signals during power-up or mode changes is critical to prevent unintended current paths or signal glitches.

What are the key differences between the SN74LVC245AQPWRHT and the SN74LVCH245APWT in terms of performance and application suitability, particularly regarding power consumption and speed?: While both devices belong to Texas Instruments’ LVC family and share similar electrical characteristics such as 8-bit bidirectional transceivers with 3-state outputs, the SN74LVCH245APWT typically features higher drive strength and faster switching speeds optimized for high-capacitive loads. The "H" variant often incorporates enhanced ESD protection and improved noise immunity, making it more suitable for industrial environments. In contrast, the standard LVC245AQPWRHT prioritizes low power and broad compatibility across voltage ranges. When selecting between them, engineers should consider total system capacitance on the output lines; if driving long traces or multiple inputs, the LVCH version may offer better reliability. However, for most general-purpose applications within the specified temperature range (-40°C to 125°C), the SN74LVC245AQPWRHT provides sufficient performance with lower quiescent current.

Can the SN74LVC245AQPWRHT be used in hot-plug scenarios where the board is powered up while connected to a live bus, and what precautions should be taken to protect against overvoltage or reverse-current conditions?: Yes, the SN74LVC245AQPWRHT can support limited hot-plug operation due to its robust input structure, but it is not rated for continuous exposure to undefined voltage states during insertion. During hot insertion, transient spikes above VCC + 0.5V may occur unless mitigated by clamping diodes or TVS components. Since the device has internal ESD protection up to ±2 kV (HBM), short-duration events are survivable, but sustained overvoltage can degrade performance. To safely implement hot plugging, designers should use series resistors on I/O lines and ensure that the OE pin is actively driven low before enabling the outputs. Additionally, decoupling capacitors close to the VCC pins help stabilize supply rails during dynamic connection events.

How does the propagation delay of the SN74LVC245AQPWRHT compare when operating at 1.8V versus 3.6V, and what impact does this have on timing budgets in high-speed digital systems?: At 1.8V supply, the SN74LVC245AQPWRHT exhibits slightly longer propagation delays—typically around 3.5 ns—compared to approximately 2.8 ns at 3.6V, based on typical values from TI’s characterization data. This difference arises from reduced overdrive margins at lower voltages, slowing transistor switching. In synchronous designs requiring tight setup and hold times, such as SPI or parallel memory interfaces, using the full 3.6V rail improves margin and reduces risk of timing violations. Engineers targeting maximum speed should allocate at least 10–15% additional time budget when operating near the minimum supply of 1.65V, especially under worst-case process, voltage, and temperature (PVT) conditions.

Is the SN74LVC245AQPWRHT suitable for driving capacitive loads greater than 50 pF per output line, and what trade-offs exist in terms of rise/fall times and power dissipation?: Driving capacitive loads beyond 50 pF is possible, but it increases rise and fall times significantly due to the limited sink/source current of 24 mA. For example, a 100 pF load might result in rise times exceeding 10 ns, potentially violating timing constraints in fast buses. While the absolute maximum ratings allow this operation, prolonged high-frequency toggling under heavy capacitive loading increases dynamic power consumption and generates electromagnetic interference (EMI). If such loads are unavoidable, adding series termination resistors or buffering with discrete FETs is recommended. Alternatively, consider using a device with higher output drive capability like the LVCH variant.

What role does the OE (output enable) pin play in preventing bus contention when multiple drivers share a common bus line, and how should it be managed in a multi-drop configuration using multiple SN74LVC245AQPWRHT instances?: The OE pin controls all eight outputs simultaneously, allowing them to enter high-impedance state when asserted high. This is essential in shared-bus topologies where multiple transceivers might attempt to drive the same net. Proper management involves ensuring only one driver has OE low at any given time through address decoding or protocol-level handshaking. In multi-drop systems, OE should transition asynchronously with data changes to minimize shoot-through currents. A common practice is to use a centralized control signal derived from chip select logic, ensuring glitch-free transitions. Failure to coordinate OE signals risks short-circuiting supply rails and damaging devices.

How does temperature variation affect the input threshold voltages of the SN74LVC245AQPWRHT, and what implications does this have for noise margins in automotive or industrial applications?: Over the industrial temperature range (-40°C to 125°C), the input high/low thresholds vary by less than ±10% relative to nominal values, maintaining acceptable noise margins even at extremes. For instance, at 1.65V supply, VIH(min) remains below 0.6 × VCC, ensuring compatibility with TTL-like inputs. This stability stems from the CMOS-compatible design of the LVC family. Nevertheless, in harsh environments with rapid thermal cycling, package stress could indirectly affect performance. Designers should still adhere to layout best practices—such as minimizing trace lengths and avoiding crosstalk—to preserve integrity. The SN74LVC245AQPWRHT meets AEC-Q100 Grade 1 qualification requirements, confirming robustness for automotive use.

Can the SN74LVC245AQPWRHT be substituted with the SN74LVC245APWT in a legacy design, and are there any functional or packaging differences that require PCB modifications?: The SN74LVC245APWT is electrically equivalent to the SN74LVC245AQPWRHT and shares identical pinout and logic functionality. However, the APWT comes in a TSSOP package with a slightly different body size (5.1 mm vs. 4.4 mm width), so mechanical footprint compatibility must be verified. Both are lead-free and RoHS compliant. If the existing PCB was designed for the 20-TSSOP (0.173", 4.40mm) variant, substituting with APWT may require respinning unless using a footprint adapter. Functionally, no change in circuit behavior is expected, but signal integrity analysis is advised if operating near bandwidth limits due to potential parasitic differences in lead inductance.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN74LVC245AQPWRHT

Product Attribute
Part Number	SN74LVC245APWRG3	SN74LVC245APWR-P	SN74LVC245APWR	SN74LVC245APWRG4
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
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	-	-	-	-
Series	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Number of Elements	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Voltage - Supply	-	-	-	-
Number of Bits per Element	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Input Type	-	-	-	Differential
Output Type	-	Current - Unbuffered	Voltage - Buffered	-
Logic Type	-	-	-	-

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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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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

Note:: The above table is for reference only. There may have some data bias for the uncontrollable factors.
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