My Inquiry
My Account
onsemi MC74VHC540DWR2
- Part No.:
- MC74VHC540DWR2
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74VHC540DWR2.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,498
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC74VHC540DWR2 from onsemi is an advanced high-speed CMOS inverting octal bus buffer with 2.0 V to 5.5 V operation, 3.7 ns typical propagation delay at 5.0 V, and dual active-low output enables (OE1/OE2) enabling high-impedance control. It interfaces 5.0 V and 3.0 V systems via 5.5 V-tolerant inputs and is used in address/data bus isolation in industrial microcontroller systems.
For engineers reviewing the MC74VHC540DWR2 datasheet, pinout, applications, or equivalent options, key selection criteria include its inverting octal buffer function, SOIC-20W package, dual OE control, 5.5 V input tolerance, and compatibility with TTL-level logic families.
Technical Context
The MC74VHC540DWR2 implements a three-stage CMOS buffer architecture with dedicated inverting output drivers, delivering balanced tPLH/tPHL propagation delays and low-output noise (VOLP ≤ 1.2 V). Its input structure supports 5.5 V tolerance independent of VCC, enabling mixed-voltage interfacing without level shifters.
Two AND-ed active-low output enables (OE1 and OE2) provide redundant or split enable control: either high forces all eight Y outputs into high-impedance state. The device meets ESD robustness standards (HBM > 2000 V) and latchup immunity (>100 mA), supporting reliable operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 5.5 V - Enables direct use in both 3.3 V and 5.0 V logic domains without external regulators. |
| tPD (Typ) | 3.7 ns at VCC = 5.0 V - Matches Bipolar Schottky TTL speed while retaining CMOS power efficiency. |
| Input Voltage Tolerance | −0.5 V to +6.5 V - Allows safe interfacing of 5.0 V signals into 3.0 V systems without clamping diodes. |
| IOZ (Max) | ±2.5 µA at VCC = 5.5 V - Ensures minimal leakage current in three-state mode for low-power standby. |
| VIH/VIL Thresholds | VCC × 0.7 / VCC × 0.3 - Provides 28% noise margin (VNIH = VNIL = 28% VCC) against signal integrity degradation. |
| Output Drive | ±8 mA at VCC = 4.5 V - Sufficient to drive standard 50 pF loads across temperature (−55°C to +125°C). |
Pinout & Package
MC74VHC540DWR2 is packaged in SOIC-20WB (Case 751D), a 20-pin wide-body surface-mount package with 1.27 mm pitch, 12.8 mm × 7.5 mm body size, and Pb-free RoHS-compliant construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - Either high disables all Y outputs to high-impedance state. |
| 2–9 | A1–A8 | Inverting data inputs - Each drives corresponding Y output with logic inversion (Yn = NOT An). |
| 11–18 | Y1–Y8 | Inverting buffered outputs - Outputs mirror inverted A-input states when both OEs are low. |
| 10 | GND | Ground reference - Common return path for all internal circuitry and I/O. |
| 20 | VCC | Positive supply - Powers internal logic and output drivers; must be decoupled per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting octal buffer function | Provides eight independent logic-inverted data paths with common enable control for bus direction management. |
| Dual active-low output enables | Enables flexible system-level control: OE1 and OE2 can be tied together or driven separately for redundancy or partitioned bus access. |
| 5.5 V-tolerant inputs | Eliminates need for external voltage translators when connecting legacy 5 V peripherals to modern 3.3 V controllers. |
| High noise immunity | 28% VCC noise margin ensures reliable switching in electrically noisy industrial or automotive board environments. |
| Pb-free & RoHS-compliant | Meets global environmental compliance requirements for commercial and industrial manufacturing without lead-based solder concerns. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Isolating microcontroller address/data buses from peripheral expansion slots in programmable logic controller chassis. IC Role / Device Role / Timing Role: Inverting octal bus buffer providing bidirectional signal conditioning and enable-controlled bus disconnection. Use Value: Dual OE pins allow synchronized bus release during hot-swap events; 5.5 V input tolerance accommodates legacy 5 V I/O modules. | Use Scenario: Level-shifting and buffering sensor/actuator signals between 5 V analog front-end ICs and 3.3 V MCU subsystems. IC Role / Device Role / Timing Role: Voltage-tolerant inverting buffer enabling safe interface between mixed-supply domains without added components. Use Value: Eliminates discrete level translators; 125°C operating range supports under-hood placement near engine control units. |
| Medical Diagnostic Equipment Data Bus | Test & Measurement Instrumentation |
Use Scenario: Driving isolated data lines from FPGA-based acquisition engines to ADC/DAC interface boards in portable ultrasound systems. IC Role / Device Role / Timing Role: Low-skew inverting buffer ensuring deterministic timing alignment across eight parallel channels. Use Value: Output-to-output skew ≤1.0 ns at 5.0 V minimizes inter-channel timing jitter critical for synchronous sampling. | Use Scenario: Enabling/disabling signal paths in modular benchtop oscilloscopes with user-configurable channel routing. IC Role / Device Role / Timing Role: Three-state controlled octal buffer managing dynamic reconfiguration of analog/digital signal chains. Use Value: High-impedance disable state prevents signal contention during channel switching; ±100 mA latchup rating ensures fault resilience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH16244ADGGR | 16-bit non-inverting, 3-state, 1.65–3.6 V only, no 5.5 V input tolerance | Requires external level translation for 5 V interface; suited for pure low-voltage systems | Select when higher channel count and lower VCC are prioritized over mixed-voltage support |
| 74VHC240M | Octal inverting buffer with identical VCC range and pinout, but single OE and different package (SOIC-20 narrow) | Lacks dual-OE flexibility; same functional behavior otherwise | Choose when board layout uses legacy SOIC-20 footprint and dual enable is unnecessary |
Compared with SN74LVCH16244ADGGR and 74VHC240M, the MC74VHC540DWR2 uniquely combines dual active-low output enables, 5.5 V input tolerance, and SOIC-20WB packaging-enabling robust mixed-voltage bus isolation where enable redundancy and legacy interface compatibility are required.
Availability
MC74VHC540DWR2 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74VHC540DWR2 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74VHC540DWR2 belongs to the VHC (Very High Speed CMOS) logic family, designed specifically for high-speed, low-power digital interfacing in mixed-voltage embedded systems requiring TTL-compatible performance and CMOS efficiency.
FAQ
What is the maximum operating temperature range for the MC74VHC540DWR2?
The MC74VHC540DWR2 is rated for operation from −55°C to +125°C, making it suitable for extended-temperature industrial and automotive under-hood applications. This range is validated across all DC and AC electrical specifications in the official onsemi datasheet Rev. 7, and thermal derating is not required up to the full 125°C junction limit.
Does the MC74VHC540DWR2 support 5 V logic levels when powered at 3.3 V?
Yes, the MC74VHC540DWR2 supports 5.5 V-tolerant inputs regardless of VCC voltage - meaning it accepts 5 V logic signals even when VCC = 3.3 V. This capability is explicitly specified in the "DC Input Voltage" parameter (VIN = −0.5 V to +6.5 V) and enables seamless interfacing between 5 V peripherals and 3.3 V controllers without external level shifters.
What is the function of the two output enable pins (OE1 and OE2) on the MC74VHC540DWR2?
The MC74VHC540DWR2 features two AND-ed active-low output enables (OE1 and OE2): if either pin is driven high, all eight Y outputs enter high-impedance state. This design allows flexible system-level control - e.g., using OE1 for primary enable and OE2 as a hardware safety override, or tying them together for standard octal buffer operation.
Is the MC74VHC540DWR2 pin-compatible with older 74-series logic devices?
The MC74VHC540DWR2 is functionally and pin-compatible with industry-standard 74HCT540 and 74LS540 devices in SOIC-20 packages, including identical pin assignments for A1–A8, Y1–Y8, OE1/OE2, VCC, and GND. However, it operates across 2.0–5.5 V (vs. fixed 5 V for LS/HCT) and offers superior noise immunity and lower power consumption.
What package type does the MC74VHC540DWR2 use, and what are its key mechanical dimensions?
The MC74VHC540DWR2 uses the SOIC-20WB (Wide Body) package (Case 751D), measuring 12.8 mm × 7.5 mm with 1.27 mm pitch and 2.5 mm height. Its wide-body construction improves thermal dissipation (θJA = 96°C/W) versus standard SOIC-20, supporting higher reliability in continuous industrial operation.
MC74VHC540DWR2 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:
- Buffer, 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74VHC540DWR2 FAQ
1.How can I place an order for MC74VHC540DWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHC540DWR2 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 MC74VHC540DWR2 reliable?
The price and inventory of MC74VHC540DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHC540DWR2 is usually 5 days.
3.What payment methods are accepted for MC74VHC540DWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHC540DWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74VHC540DWR2?
MC74VHC540DWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHC540DWR2 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 MC74VHC540DWR2?
For technical support, including MC74VHC540DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHC540DWR2 requirements.
6.How does Aetrix verify that MC74VHC540DWR2 is sourced from the original manufacturer or authorized distributors?
All MC74VHC540DWR2 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 MC74VHC540DWR2 meets industry standards.
7.What is the process for return or replacement of MC74VHC540DWR2?
All MC74VHC540DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHC540DWR2, 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 MC74VHC540DWR2 part is unused and in its original packaging.
Return procedure for MC74VHC540DWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC74VHC540DWR2 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…
