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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74VHCT245M

Name: 74VHCT245M
Brand: onsemi
SKU: 74VHCT245M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHCT245M

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74VHCT245M.pdf

Description:: IC TXRX NON-INVERT 5.5V 20SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VHCT245M from onsemi is an octal bus transceiver with 3-STATE outputs, designed for bidirectional asynchronous data bus communication between 3 V and 5 V systems. It features 5.4 ns typical propagation delay at 5 V, ±8 mA output drive, and operates across −40°C to +85°C with 4.5–5.5 V supply. It isolates busses via OE control and direction via T/R input.

For engineers reviewing the 74VHCT245M datasheet, pinout, applications, or equivalent options, key selection considerations include bidirectional level-shifting capability, 3-STATE timing (tPZL/tPLZ ≤ 16 ns), I/O voltage tolerance up to 5.5 V independent of VCC, and Pb-free TSSOP20 packaging compatible with automated SMT assembly.

Technical Context

The 74VHCT245M implements a silicon-gate CMOS octal transceiver architecture with dual-directional data flow controlled by the T/R input and output enable/disable governed by OE. Its inputs and outputs tolerate 0–5.5 V regardless of VCC, enabling robust interfacing between mismatched supply domains.

It delivers TTL-compatible speed (tPLH/tPHL ≤ 9.5 ns at CL = 50 pF) while maintaining CMOS-level quiescent current (ICC ≤ 4 µA at TA = 25°C). The device includes power-down protection, input clamp diodes, and ESD immunity per HBM (2000 V), supporting reliable operation in mixed-voltage industrial and embedded systems.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - Ensures stable operation in standard 5 V logic rails with ±10% tolerance.
tPD (Typ)	5.4 ns at VCC = 5 V, CL = 50 pF - Enables high-speed data transfer in 20–30 MHz bus applications.
IOL/IOH	±8 mA - Drives standard TTL loads and supports fan-out of ≥10 LS-TTL units.
VIH/VIL	2.0 V / 0.8 V - Guarantees clean logic recognition with 5 V CMOS/TTL input thresholds.
IOZ (Max)	±2.5 µA at TA = −40°C to +85°C - Maintains low leakage in 3-STATE mode for bus isolation integrity.
Operating Temp	−40°C to +85°C - Qualified for industrial-grade ambient environments without derating.
ESD HBM	2000 V - Provides baseline electrostatic robustness for handling and board-level integration.

Pinout & Package

TSSOP20 package (Case 948AQ), 4.4 mm × 6.5 mm body, 0.65 mm pitch, JEDEC MO-153 compliant, Pb-free.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Output Enable Input	Active-low global control: disables all A/B outputs into high-impedance state when HIGH.
2 (T/R)	Transmit/Receive Input	Determines data direction: LOW enables B→A; HIGH enables A→B.
3–10 (A0–A7)	Side A I/O Terminals	Bidirectional ports: function as inputs when data flows from B to A, outputs when A to B.
11 (GND)	Ground Reference	Common return path for VCC and all signal currents; must be low-inductance connection.
12–19 (B0–B7)	Side B I/O Terminals	Bidirectional ports: function as inputs when data flows from A to B, outputs when B to A.
20 (VCC)	Power Supply	Primary 4.5–5.5 V supply rail; decoupling capacitor required within 1 cm of this pin.

Key Features

Feature	Design Value
5.4 ns typical tPD	Enables synchronous data transfers up to ~100 Mbps in short-bus configurations with 50 pF load.
0–5.5 V I/O tolerance	Allows direct interface between 3 V microcontrollers and 5 V peripherals without external level shifters.
Power-down protection	Prevents latch-up or damage when VCC = 0 V but signals remain present on A/B pins.
Pb-free TSSOP20	Complies with RoHS Directive 2011/65/EU and supports lead-free reflow profiles (JEDEC J-STD-020).
Pin/function compatible with 74HCT245	Permits drop-in replacement in legacy HCT-based designs without layout or firmware changes.

Applications

Industrial PLC Backplane Interface	Automotive Body Control Module
Use Scenario: Bidirectional data exchange between 3.3 V ARM Cortex-M7 MCU and legacy 5 V CAN/LIN transceiver subsystems on shared backplane. IC Role / Device Role / Timing Role: Level-shifting bus transceiver managing direction and isolation under microcontroller GPIO control. Use Value: Eliminates discrete level-shifters; supports hot-swap-safe 3-STATE disable during firmware updates.	Use Scenario: Isolating diagnostic communication lines between 5 V OBD-II interface IC and 3.3 V vehicle network controller. IC Role / Device Role / Timing Role: Direction-controlled buffer enabling UART/ISO 9141-2 protocol handshaking with precise timing margins. Use Value: Meets automotive transient immunity requirements via built-in clamp diodes and 2000 V HBM ESD rating.
Medical Patient Monitor Data Bus	Test Equipment Digital I/O Expansion
Use Scenario: Interfacing low-power 3 V ADC/DAC modules with 5 V FPGA-based signal processing engine in portable diagnostics unit. IC Role / Device Role / Timing Role: Low-noise, low-skew (≤1.0 ns) transceiver preserving signal integrity across multi-drop bus segments. Use Value: Achieves <10 ns total propagation + skew budget required for 25 MHz parallel sampling clock distribution.	Use Scenario: Expanding GPIB or PXI digital I/O capacity using modular 74VHCT245M-based daughterboards in automated test fixtures. IC Role / Device Role / Timing Role: Reconfigurable bus driver supporting both input capture and output stimulus modes via T/R control. Use Value: Reduces fixture redesign cycles via OE-controlled bus isolation during concurrent DUT and fixture self-test.

Industrial PLC Backplane Interface

Automotive Body Control Module

Use Scenario: Bidirectional data exchange between 3.3 V ARM Cortex-M7 MCU and legacy 5 V CAN/LIN transceiver subsystems on shared backplane.

IC Role / Device Role / Timing Role: Level-shifting bus transceiver managing direction and isolation under microcontroller GPIO control.

Use Value: Eliminates discrete level-shifters; supports hot-swap-safe 3-STATE disable during firmware updates.

Use Scenario: Isolating diagnostic communication lines between 5 V OBD-II interface IC and 3.3 V vehicle network controller.

IC Role / Device Role / Timing Role: Direction-controlled buffer enabling UART/ISO 9141-2 protocol handshaking with precise timing margins.

Use Value: Meets automotive transient immunity requirements via built-in clamp diodes and 2000 V HBM ESD rating.

Medical Patient Monitor Data Bus

Test Equipment Digital I/O Expansion

Use Scenario: Interfacing low-power 3 V ADC/DAC modules with 5 V FPGA-based signal processing engine in portable diagnostics unit.

IC Role / Device Role / Timing Role: Low-noise, low-skew (≤1.0 ns) transceiver preserving signal integrity across multi-drop bus segments.

Use Value: Achieves <10 ns total propagation + skew budget required for 25 MHz parallel sampling clock distribution.

Use Scenario: Expanding GPIB or PXI digital I/O capacity using modular 74VHCT245M-based daughterboards in automated test fixtures.

IC Role / Device Role / Timing Role: Reconfigurable bus driver supporting both input capture and output stimulus modes via T/R control.

Use Value: Reduces fixture redesign cycles via OE-controlled bus isolation during concurrent DUT and fixture self-test.

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	Wider VCC range (1.65–3.6 V), lower drive (±24 mA), no 5 V tolerant inputs without external resistors.	Optimized for 3.3 V-only systems; not suitable for 5 V bus interfacing without level translation.	Select when operating exclusively in 3.3 V domains and requiring lower ICC (max 10 µA).
74AHCT245	Higher speed (tPD = 3.6 ns typ), identical 5 V tolerance and pinout, but higher ICC (max 40 µA).	Preferred where sub-5 ns propagation is critical and power budget allows ~10× higher quiescent current.	Choose for high-throughput industrial controllers needing minimal bus latency at full 5 V supply.

Compared with SN74LVC245A and 74AHCT245, the 74VHCT245M uniquely balances 5 V tolerance, 5.4 ns speed, and ultra-low ICC (4 µA max) - making it optimal for mixed-voltage industrial systems requiring long-term reliability and minimal standby power.

Availability

74VHCT245M is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical patient monitor data buses requiring stable component supply, RoHS compliance, and long-lifecycle support.

Supply support for 74VHCT245M 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, serving automotive, industrial, cloud, and medical markets with differentiated analog, power, and sensing solutions.

The 74VHCT245M belongs to onsemi's VHCT logic family, engineered for high-speed, low-power bidirectional bus interfacing in mixed-voltage embedded systems where reliability and compatibility with legacy TTL/HCT designs are essential.

FAQ

What is the maximum operating temperature range for the 74VHCT245M?

The 74VHCT245M is rated for continuous operation from −40°C to +85°C. This industrial temperature range is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and 3-STATE leakage. Thermal resistance (θJA = 150°C/W) ensures safe junction temperatures under typical PCB layouts with 2-ounce copper. The 74VHCT245M maintains full functionality without derating across this range.

Can the 74VHCT245M safely interface a 3.3 V microcontroller with a 5 V peripheral?

Yes - the 74VHCT245M supports 0–5.5 V input/output voltage tolerance independent of VCC, enabling direct connection between 3.3 V logic (driving A-side) and 5 V peripherals (on B-side) without external level shifters. Its VIH threshold (2.0 V min) and VOL (0.44 V max at 8 mA) ensure noise-immune switching. The 74VHCT245M achieves this while drawing only 4 µA quiescent current.

Is the 74VHCT245M pin-compatible with older 74HCT245 devices?

Yes - the 74VHCT245M is pin and function compatible with the 74HCT245, sharing identical TSSOP20 pinout, truth table, and logic behavior. This allows drop-in replacement in existing designs. Key improvements include tighter propagation delay (5.4 ns vs. 8 ns typ), lower ICC (4 µA vs. 40 µA), and enhanced ESD robustness (2000 V HBM). The 74VHCT245M retains full backward compatibility.

What is the 3-STATE disable time (tPHZ/tPLZ) for the 74VHCT245M?

The 74VHCT245M has a maximum 3-STATE output disable time of 16.5 ns (tPHZ/tPLZ) at VCC = 5.0 V, CL = 50 pF, and TA = −40°C to +85°C. This parameter defines how quickly outputs transition from active to high-impedance after OE goes HIGH. Fast disable minimizes bus contention during direction or enable transitions. The 74VHCT245M meets this spec across its full operating range without external components.

Does the 74VHCT245M require external pull-up or pull-down resistors on unused inputs?

Yes - per the datasheet, all unused inputs of the 74VHCT245M must be tied to a valid logic level (VCC or GND) to prevent floating nodes, increased ICC, and potential oscillation. Unused outputs may be left open. This requirement applies to OE, T/R, and any unconnected A/B port pins. The 74VHCT245M does not integrate internal weak pull-ups or pull-downs, so external biasing is mandatory for reliable operation.

74VHCT245M Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VHCT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: -

Current - Output High, Low:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74VHCT245M FAQ

1.How can I place an order for 74VHCT245M through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHCT245M 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 74VHCT245M reliable?

The price and inventory of 74VHCT245M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT245M is usually 5 days.

3.What payment methods are accepted for 74VHCT245M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT245M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHCT245M?

74VHCT245M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHCT245M 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 74VHCT245M?

For technical support, including 74VHCT245M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT245M requirements.

6.How does Aetrix verify that 74VHCT245M is sourced from the original manufacturer or authorized distributors?

All 74VHCT245M 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 74VHCT245M meets industry standards.

7.What is the process for return or replacement of 74VHCT245M?

All 74VHCT245M units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT245M, 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 74VHCT245M part is unused and in its original packaging.

Return procedure for 74VHCT245M:

1.Submit a request within 90 days.

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

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