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onsemi MC74VHC245DWR2
- Part No.:
- MC74VHC245DWR2
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74VHC245DWR2.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,486
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Product details
Overview
MC74VHC245DWR2 from onsemi is an advanced high-speed CMOS octal bus buffer/line driver in SOIC-20 package, designed for bidirectional asynchronous data bus communication. It features direction control via DIR input, output enable/disable via OE pin, 4.0 ns typical propagation delay at 5.0 V, ±25 mA output drive, and 2.0–5.5 V supply range - enabling robust level translation between 3.3 V and 5.0 V systems in industrial control backplanes.
For engineers reviewing the MC74VHC245DWR2 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-20 terminal mapping, real-world use cases in bus isolation and voltage-level bridging, and two validated alternative parts with documented functional and interface differences.
Technical Context
The MC74VHC245DWR2 implements dual-bus bidirectional buffering using silicon-gate CMOS technology with TTL-compatible input thresholds only in the VHCT variant - this part is the VHC version, supporting standard CMOS input levels (VIH = 0.7×VCC, VIL = 0.3×VCC). Its DIR-controlled transmission path allows dynamic reversal of data flow between A- and B-side 8-bit buses without latch-up risk (exceeding 100 mA per JEDEC JESD78 Class II).
All inputs tolerate up to 5.5 V, enabling safe interfacing of 5 V systems to lower-voltage domains. The device enters high-impedance state when OE is high, isolating both buses; it includes ESD protection (>2000 V HBM) and power-down protection, but lacks active VCC=0 V output clamping - a feature reserved for the MC74VHCT245A variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 5.5 V - supports mixed-voltage system integration including 3.3 V logic domains. |
| tPD (Typ) | 4.0 ns at VCC = 5.0 V, CL = 15 pF - enables high-throughput data transfer in fast parallel interfaces. |
| IOL / IOH | ±25 mA per pin - drives standard CMOS loads and short PCB traces without external buffers. |
| VIH / VIL | VIH = 0.7×VCC, VIL = 0.3×VCC - ensures noise margin ≥28% and compatibility with standard CMOS outputs. |
| IOZ (Max) | ±2.5 µA at TA = −40 to +85°C - guarantees low leakage during tri-state isolation, critical for bus contention prevention. |
| ICC (Max) | 4.0 µA at TA = 25°C - ultra-low quiescent current suitable for battery-backed or always-on subsystems. |
| Cin (Max) | 10 pF - minimizes capacitive loading on upstream drivers, preserving signal integrity at high edge rates. |
Pinout & Package
MC74VHC245DWR2 is housed in a 20-pin SOIC-Wide Body (SOIC-20 WB, Case 751D) package measuring 12.8 mm × 7.5 mm × 2.35 mm (L × W × H), with 1.27 mm pitch and Pb-free RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low control: OE = L enables bus transceivers; OE = H forces all A/B I/Os into high-impedance state. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | 8-bit bidirectional data port; direction determined by DIR; electrically isolated when OE = H. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O currents; must be low-impedance connection. |
| 11–18 (B1–B8) | Port B Data Inputs/Outputs | 8-bit bidirectional data port mirroring A-side behavior; shares DIR and OE controls. |
| 19 (DIR) | Direction Control | DIR = L: data flows B → A; DIR = H: data flows A → B - no internal latching, synchronous with OE. |
| 20 (VCC) | Power Supply | Single-supply rail (2.0–5.5 V); decoupling capacitor (0.1 µF) required near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed bidirectional buffering | 4.0 ns typical tPD at 5.0 V enables >100 MHz bus clocking in non-critical timing paths. |
| Wide supply voltage range | 2.0–5.5 V operation eliminates need for separate level-shifting ICs in multi-rail systems. |
| Input overvoltage tolerance | Inputs withstand up to 5.5 V regardless of VCC - permits safe hot-plug and mixed-voltage probing. |
| Low-noise output switching | VOLP ≤ 1.2 V (max) reduces ground bounce and crosstalk in dense PCB layouts. |
| Robust ESD and latch-up immunity | 2000 V HBM ESD rating and >100 mA latch-up performance ensure reliability in manufacturing and field use. |
Applications
| Industrial Backplane Interface | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating and extending 8-bit parallel address/data buses between PLC CPU modules and I/O expansion racks operating at different supply voltages. IC Role / Device Role / Timing Role: Bidirectional bus buffer managing direction and enable timing under microcontroller GPIO control; provides clean signal regeneration across 15 cm backplane traces. Use Value: Eliminates bus contention during hot-swap events and supports 3.3 V MCU interfacing with legacy 5 V peripheral modules without external level shifters. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 microcontroller by connecting external parallel memory (SRAM/Flash) or LCD controller via multiplexed 8-bit data bus. IC Role / Device Role / Timing Role: Direction-controlled transceiver synchronizing data flow between MCU and peripheral; OE timed to match memory access strobes. Use Value: Enables zero-wait-state memory reads/writes at 50 MHz due to sub-5 ns propagation delay and tight output skew (<1.0 ns). |
| Test Equipment Signal Routing | Automotive Diagnostic Interface |
|
Use Scenario: Reconfigurable signal path routing in automated test equipment where DUT interface voltage (3.3 V or 5 V) varies per test fixture. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional buffer allowing software-defined bus direction and isolation during calibration sequences. Use Value: Reduces fixture-specific hardware variants; single design supports both LVCMOS and TTL-level DUTs via programmable DIR/OE sequencing. |
Use Scenario: Bridging UART or CAN controller signals between 3.3 V automotive infotainment SoC and 5 V OBD-II diagnostic connector circuitry. IC Role / Device Role / Timing Role: Level-translating bus buffer handling bidirectional K-line or UART data; operates within AEC-Q100 qualified environment when used with −Q suffix variants. Use Value: Provides galvanic isolation-like functionality via tri-state control during bus arbitration, preventing signal corruption during ECU reset transitions. |
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, identical pinout and function - but lacks 2.0–3.0 V operation. | Required when interfacing legacy 5 V TTL logic; not suitable for sub-3.3 V domains due to 4.5–5.5 V VCC constraint. | Select when interfacing pure 5 V TTL sources; avoid if system uses 3.3 V or mixed-voltage logic families. |
| SN74LVC245APWR | Lower VCC range (1.65–3.6 V), 3.3 V optimized, 3.5 ns tPD (typ), same 20-pin TSSOP package - but not pin-compatible with SOIC-20. | Designed for modern low-voltage embedded systems; requires PCB layout change due to TSSOP-20 footprint. | Choose for space-constrained 3.3 V-only designs; verify board rework feasibility before substitution. |
Compared with MC74VHC245DWR2, the MC74VHCT245ADWR2G offers guaranteed TTL input compatibility at 5 V but sacrifices low-voltage flexibility, while the SN74LVC245APWR delivers faster speed and lower voltage support in a smaller TSSOP package - requiring mechanical redesign but enabling higher-density layouts.
Availability
MC74VHC245DWR2 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, and automotive diagnostic interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74VHC245DWR2 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 MC74VHC245DWR2 belongs to onsemi's high-speed CMOS logic family, engineered for reliable bidirectional bus interfacing in mixed-voltage systems where low power, wide VCC range, and robust noise immunity are essential.
FAQ
What is the maximum operating temperature range for the MC74VHC245DWR2?
The MC74VHC245DWR2 is rated for continuous operation from −40°C to +85°C ambient temperature, meeting industrial-grade thermal requirements. This range is validated per the Recommended Operating Conditions table in the official datasheet, and applies across the full 2.0–5.5 V supply range without derating.
Can the MC74VHC245DWR2 be used to interface 5 V and 3.3 V systems directly?
Yes - the MC74VHC245DWR2 supports direct 5 V ↔ 3.3 V interfacing because its inputs tolerate up to 5.5 V regardless of VCC, and its outputs swing rail-to-rail (0 V to VCC). When VCC = 3.3 V, it accepts 5 V inputs safely; when VCC = 5.0 V, it drives 5 V logic levels compatible with 3.3 V–tolerant receivers.
Does the MC74VHC245DWR2 have built-in ESD protection?
Yes, the MC74VHC245DWR2 includes integrated ESD protection circuits on all inputs, rated to >2000 V per the Human Body Model (HBM) per EIA/JESD22-A114-A. This meets standard handling requirements for automated assembly and field service without additional external protection diodes.
What is the function of the DIR pin on the MC74VHC245DWR2?
The DIR (Direction) pin on the MC74VHC245DWR2 controls data flow direction between the A and B ports: DIR = Low enables transmission from Port B to Port A; DIR = High enables transmission from Port A to Port B. It operates asynchronously with OE and does not latch state - direction changes immediately upon DIR transition.
Is the MC74VHC245DWR2 pin-compatible with the MC74VHCT245A series?
Yes - the MC74VHC245DWR2 is functionally and physically pin-compatible with the MC74VHCT245A series (e.g., MC74VHCT245ADWR2G), sharing identical SOIC-20 pinout, terminal functions, and logic behavior. However, the VHC variant uses CMOS-input thresholds while VHCT uses TTL-input thresholds - requiring verification of source logic family compatibility.
MC74VHC245DWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MC74VHC245DWR2 FAQ
1.How can I place an order for MC74VHC245DWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHC245DWR2 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 MC74VHC245DWR2 reliable?
The price and inventory of MC74VHC245DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHC245DWR2 is usually 5 days.
3.What payment methods are accepted for MC74VHC245DWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHC245DWR2 transactions.
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4.How is shipping managed for MC74VHC245DWR2?
MC74VHC245DWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHC245DWR2 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 MC74VHC245DWR2?
For technical support, including MC74VHC245DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHC245DWR2 requirements.
6.How does Aetrix verify that MC74VHC245DWR2 is sourced from the original manufacturer or authorized distributors?
All MC74VHC245DWR2 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 MC74VHC245DWR2 meets industry standards.
7.What is the process for return or replacement of MC74VHC245DWR2?
All MC74VHC245DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHC245DWR2, 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 MC74VHC245DWR2 part is unused and in its original packaging.
Return procedure for MC74VHC245DWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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