My Inquiry
My Account
onsemi MC74VHC245DW
- Part No.:
- MC74VHC245DW
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74VHC245DW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,310
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC74VHC245DW from onsemi is an advanced high-speed CMOS octal bus buffer/line driver in SOIC-20 package, designed for two-way asynchronous communication between data buses. It features direction control (DIR), output enable (OE), 4.0 ns typical propagation delay at 5.0 V, ±25 mA output drive, and 2.0–5.5 V supply range - enabling use in mixed-voltage 3.3 V/5.0 V system interconnects.
For engineers reviewing the MC74VHC245DW datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-20 terminal mapping, noise-immune bus isolation behavior, and real-world interface design considerations for bidirectional data routing in industrial controllers and embedded peripherals.
Technical Context
The MC74VHC245DW implements dual 8-bit bidirectional buffers with independent DIR and OE controls: DIR selects A→B or B→A data flow, while OE places all outputs in high-impedance state to isolate buses. Inputs tolerate up to 5.5 V, supporting 5 V-to-3 V level translation without external circuitry.
Its silicon-gate CMOS process ensures balanced tPLH/tPHL propagation delays (≤7.5 ns max at 5 V, CL = 50 pF), low dynamic noise (VOLP ≤ 1.2 V), and latchup immunity >100 mA. Input protection circuits guard against ESD (>2000 V HBM), and power-down protection prevents damage during hot insertion or VCC = 0 V conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 5.5 V - enables operation across 3.3 V and 5.0 V logic domains without level shifters. |
| Propagation Delay (tPD) | 4.0 ns (typ) at VCC = 5.0 V, CL = 15 pF - supports high-speed data transfer in 100+ MHz bus systems. |
| Output Drive Strength | ±25 mA per pin - sufficient to drive standard CMOS loads and moderate PCB trace capacitance. |
| Input Voltage Tolerance | −0.5 V to +6.5 V - allows safe interfacing of 5 V signals into 3 V systems without clamping diodes. |
| Quiescent Supply Current | 4.0 µA (max) at TA = 25°C - ensures ultra-low static power in battery-backed or always-on subsystems. |
| ESD Immunity | Human Body Model > 2000 V - meets industrial IEC 61000-4-2 baseline for robust handling and board-level reliability. |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial environments including motor drives and PLC I/O modules. |
Pinout & Package
MC74VHC245DW is housed in a 20-pin SOIC Wide Body (SOIC-20 WB) package per case 751D, with 1.27 mm pitch, 12.8 mm × 7.5 mm body size, and Pb-free (RoHS-compliant) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low global control: pulls all A/B outputs to high-Z when high; enables bidirectional buffering when low. |
| 2–9 (A1–A8) | Port A Data I/O | 8-bit input/output port connected to one data bus; direction determined by DIR and OE states. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O current; must be low-inductance connection. |
| 11–18 (B1–B8) | Port B Data I/O | 8-bit input/output port connected to second data bus; electrically isolated from Port A when OE = high. |
| 19 (DIR) | Direction Control | Controls data flow: DIR = low → B→A; DIR = high → A→B; only active when OE = low. |
| 20 (VCC) | Positive Supply | Single 2.0–5.5 V supply powering all logic and output stages; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| High-Speed Buffering | 4.0 ns typical tPD at 5.0 V enables reliable timing closure in 100+ MHz parallel bus designs. |
| Bidirectional Isolation | Independent OE and DIR pins allow precise control of bus separation and data direction without external logic. |
| Mixed-Voltage Interface | 5.5 V-tolerant inputs permit direct connection of 5 V microcontrollers to 3.3 V FPGAs or ASICs. |
| Low-Noise Operation | VOLP ≤ 1.2 V (max) minimizes switching noise coupling into adjacent analog or clock traces. |
| Robust ESD Protection | Integrated input protection circuits exceed 2000 V HBM, reducing need for external TVS devices. |
| Pb-Free & RoHS Compliant | Meets global environmental regulations and supports lead-free reflow soldering profiles (JEDEC J-STD-020). |
Applications
| Industrial PLC Backplane | Embedded Microcontroller Expansion |
|---|---|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards over a shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Bus buffer isolating CPU address/data lines from peripheral modules; DIR selects master/slave direction, OE enables hot-swap capability. Use Value: Prevents bus contention during card insertion/removal and supports mixed-voltage (3.3 V CPU / 5 V sensors) interoperability. |
Use Scenario: Extending GPIO count of an ARM Cortex-M4 MCU to drive multiple LCD segments and keypad rows. IC Role / Device Role / Timing Role: Octal buffer providing additional drive strength and voltage translation between 3.3 V MCU and 5 V display logic. Use Value: Eliminates need for discrete level shifters while maintaining <4 ns timing margin for 20 MHz SPI-like parallel updates. |
| Automotive Body Control Module | Test Equipment Digital I/O Interface |
Use Scenario: Interfacing a 5 V CAN controller's status registers to a 3.3 V diagnostic microcontroller via parallel debug port. IC Role / Device Role / Timing Role: Level-translating bus buffer ensuring signal integrity during vehicle ECU firmware updates and diagnostics. Use Value: Enables direct 5 V-to-3.3 V logic translation without external resistors or dedicated level shifter ICs. |
Use Scenario: Programmable digital stimulus/response interface between ATE controller and DUT with configurable bus direction. IC Role / Device Role / Timing Role: Reconfigurable 8-bit transceiver allowing test patterns to be driven onto or captured from DUT pins. Use Value: Reduces fixture complexity by replacing two unidirectional buffers with single DIR-controllable device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC74VHCT245ADWR2G | TTL-compatible inputs (VIH = 2.0 V min), same SOIC-20 package and pinout; requires 4.5–5.5 V supply only. | Designed for 5 V-only systems interfacing legacy TTL logic; not suitable for 3.3 V supply rails. | Select when interfacing 5 V microcontrollers to older TTL peripherals where input threshold compatibility is critical. |
| SN74LVC245APWR | Lower VCC range (1.65–3.6 V), 3.3 V native operation, higher drive (±24 mA), but no 5.5 V input tolerance. | Optimized for modern low-voltage FPGA/CPU interfaces; cannot accept 5 V inputs safely. | Prefer for pure 3.3 V systems requiring minimal power and smaller footprint (TSSOP-20); avoid in mixed-voltage contexts. |
Compared with MC74VHC245DW, the MC74VHCT245ADWR2G offers TTL input compatibility at the cost of reduced supply flexibility, while SN74LVC245APWR delivers lower voltage operation and smaller size but sacrifices 5 V-tolerant inputs - making MC74VHC245DW uniquely suited for bridging 3.3 V and 5 V domains in industrial backplanes.
Availability
MC74VHC245DW is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller expansion interfaces, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74VHC245DW 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 specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC74VHC245DW belongs to the VHC logic family - engineered for high-speed, low-power, mixed-voltage bidirectional bus interfacing in industrial control and embedded computing applications.
FAQ
What is the maximum operating supply voltage for the MC74VHC245DW?
The MC74VHC245DW supports a DC supply voltage range of −0.5 V to +6.5 V, with recommended operation from 2.0 V to 5.5 V. Absolute maximum VCC is 6.5 V; exceeding this risks permanent damage. For reliable long-term operation, maintain VCC within 2.0–5.5 V per the Recommended Operating Conditions table in the datasheet.
Can the MC74VHC245DW safely interface a 5 V microcontroller with a 3.3 V FPGA?
Yes - the MC74VHC245DW inputs tolerate up to 5.5 V regardless of VCC, enabling direct connection of 5 V outputs to its A or B ports while powered from 3.3 V. Its outputs swing rail-to-rail (0 V to VCC), so 3.3 V logic levels are delivered to the FPGA. No external level-shifting components are needed.
What is the function of the DIR and OE pins on the MC74VHC245DW?
The OE (output enable) pin is active-low and globally disables all outputs, placing them in high-impedance state to isolate the buses. The DIR (direction) pin determines data flow direction only when OE is asserted: DIR = low enables B→A transmission; DIR = high enables A→B transmission. Both controls operate independently.
Does the MC74VHC245DW require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs (including DIR and OE) must be tied to a valid logic level (VCC or GND) to prevent floating states that cause excessive ICC, noise susceptibility, or undefined operation. The datasheet explicitly warns against leaving inputs unconnected, as this may increase power consumption and risk latchup.
Is the MC74VHC245DW pin-compatible with the MC74VHCT245A series?
Yes - the MC74VHC245DW and MC74VHCT245ADWR2G share identical SOIC-20 pinouts and functional pin assignments (A1–A8, B1–B8, DIR, OE, VCC, GND). However, they differ in input threshold compatibility (CMOS vs. TTL) and supply voltage requirements, so direct substitution requires verification of system-level voltage and logic family constraints.
MC74VHC245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- 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:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74VHC245DW FAQ
1.How can I place an order for MC74VHC245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHC245DW 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 MC74VHC245DW reliable?
The price and inventory of MC74VHC245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHC245DW is usually 5 days.
3.What payment methods are accepted for MC74VHC245DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHC245DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74VHC245DW?
MC74VHC245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHC245DW 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 MC74VHC245DW?
For technical support, including MC74VHC245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHC245DW requirements.
6.How does Aetrix verify that MC74VHC245DW is sourced from the original manufacturer or authorized distributors?
All MC74VHC245DW 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 MC74VHC245DW meets industry standards.
7.What is the process for return or replacement of MC74VHC245DW?
All MC74VHC245DW units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHC245DW, 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 MC74VHC245DW part is unused and in its original packaging.
Return procedure for MC74VHC245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC74VHC245DW Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
