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Toshiba Semiconductor and Storage 74VHC540FT
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- Part No.:
- 74VHC540FT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHC540FT.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:117,335
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Product details
Overview
74VHC540FT from Toshiba Electronic Devices & Storage Corporation is an advanced high-speed CMOS octal bus buffer with inverting 3-state outputs, designed for bidirectional data bus isolation and level translation between 2.0 V–5.5 V systems. It delivers 3.7 ns typical propagation delay at 5.0 V, supports AEC-Q100 Grade 1 qualification (−40 °C to +125 °C), and features input protection enabling safe 5 V-to-3 V interfacing in automotive and industrial control backplanes.
For engineers reviewing the 74VHC540FT datasheet, 74VHC540FT pinout, 74VHC540FT application, or 74VHC540FT equivalent, key selection criteria include its inverting 3-state logic behavior, TSSOP20B package footprint, guaranteed −40 °C to +125 °C operation, low 4.0 µA max ICC at 25 °C, and compatibility with legacy 74AC/HC/AHC/LV 540-type bus buffers.
Technical Context
The 74VHC540FT implements eight independent inverting buffer channels, each controlled by dual active-low enable inputs (G1 and G2) - both must be low for output activation; either high forces high-impedance state. Its C2MOS silicon gate process enables TTL-compatible speed with CMOS power efficiency.
It features robust input protection allowing 0–5.5 V input voltage regardless of VCC, enabling mixed-voltage system interfacing without external clamping. Propagation delays are balanced (tPLH ≈ tPHL), and noise immunity is specified at ≥28% VCC for both VIH and VIL thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal bus buffer with 3-state outputs |
| Propagation Delay | 3.7 ns (typ.) at VCC = 5.0 V, CL = 50 pF - enables high-speed data transfer in 25 MHz+ bus systems |
| Supply Voltage Range | 2.0 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V domains, including battery-backed systems |
| Operating Temperature | −40 °C to +125 °C - qualified per AEC-Q100 Rev. H for under-hood automotive and industrial environments |
| Quiescent Current | 4.0 µA (max) at TA = 25 °C - ensures ultra-low static power in always-on subsystems |
| Input Voltage Tolerance | 0 V to 5.5 V independent of VCC - eliminates need for external level-shifters when interfacing 5 V logic to 3 V buses |
| Output Drive | ±8 mA at VCC = 4.5 V - sufficient to drive standard CMOS loads and short PCB traces without buffering |
Pinout & Package
TSSOP20B - 20-pin thin shrink small outline package (4.4 mm × 6.5 mm, 0.65 mm pitch), surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19, 2, 18, 3, 17, 4, 16 | Input (A1–A8) | Active-high data inputs; inverted and gated before output |
| 15, 14, 13, 12, 11, 10, 9, 7 | Output (Y1–Y8) | Inverted, 3-state outputs; high-impedance when G1 or G2 = high |
| 5, 6 | Enable (G1, G2) | Active-low dual enables; OR logic - either high disables all outputs |
| 20 | VCC | Positive supply (2.0–5.5 V); decoupling capacitor required near pin |
| 10 | GND | Ground reference; low-inductance connection critical for noise control |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 compliance | Qualified for automotive applications requiring −40 °C to +125 °C operation and reliability validation |
| Balanced propagation delays | tPLH ≈ tPHL minimizes skew-induced timing violations in synchronous bus architectures |
| Power-down input protection | All inputs tolerate 0–5.5 V regardless of VCC state - prevents latch-up during power sequencing |
| Low dynamic noise (VOLP) | 1.0 V max quiet-output noise peak - reduces crosstalk in dense PCB layouts |
| PIN- AND FUNCTION-COMPATIBLE WITH 74 SERIES | Drop-in replacement for 74AC540, 74HC540, and 74AHC540 in existing TSSOP20 designs |
Applications
| Automotive Body Control Module | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy CAN/LIN transceiver buses and relay driver banks in vehicle door modules. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled data isolation and voltage-level adaptation between 3.3 V MCU and 5 V peripheral subsystems. Use Value: Enables reliable bidirectional communication while preventing ground-loop currents and meeting AEC-Q100 temperature and ESD requirements. |
Use Scenario: Buffering address/data lines between a 5 V FPGA and multiple 3.3 V I/O expansion cards on a modular PLC rack backplane. IC Role / Device Role / Timing Role: Octal inverting bus buffer with fast 3.7 ns propagation ensuring setup/hold timing margins across 20 cm backplane traces. Use Value: Maintains signal integrity and timing accuracy without adding clock-domain crossing logic or external level shifters. |
| Medical Diagnostic Equipment Data Bus | Test & Measurement Instrumentation |
Use Scenario: Interfacing a 5 V ADC front-end to a 3.3 V ARM-based processing unit in portable ultrasound devices. IC Role / Device Role / Timing Role: Inverting 3-state buffer used in multiplexed sensor data acquisition paths, enabled only during read cycles. Use Value: Prevents bus contention during idle periods and ensures sub-5 ns timing alignment critical for 10 MSPS sampling synchronization. |
Use Scenario: Driving multiple DUT (device-under-test) interface channels from a central pattern generator in automated test equipment. IC Role / Device Role / Timing Role: Octal buffer providing fan-out and impedance matching for parallel digital stimulus signals across 8 test sites. Use Value: Delivers consistent 8-channel timing skew <10.5 ns (max) over full temperature range, enabling synchronized multi-site testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74VHC540M | TSSOP20 package replaced with SOIC20; 0.65 mm → 1.27 mm pitch; slightly higher 5.0 ns typ. tPD at 5 V | Larger footprint; less suitable for space-constrained automotive modules but easier hand-soldering and rework | Select 74VHC540M for prototyping or legacy board upgrades where SOIC20 is already routed. |
| SN74LVC540APWR | Lower VCC range (1.65–3.6 V); non-AEC-Q100; 3.9 ns typ. tPD at 3.3 V; different enable logic (single active-low OE) | Not rated for >85 °C ambient; unsuitable for under-hood use but optimized for portable 3.3 V systems | Choose SN74LVC540APWR only for cost-sensitive consumer electronics operating strictly within 3.3 V domain and ≤85 °C. |
Compared with 74VHC540FT, the 74VHC540M offers mechanical compatibility with legacy through-hole footprints but sacrifices speed and thermal performance, while the SN74LVC540APWR trades automotive qualification and wide voltage support for lower voltage operation and reduced static power - neither is pin-compatible without layout revision.
Availability
74VHC540FT is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC backplanes, medical diagnostic data buses, and test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHC540FT 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
Toshiba Electronic Devices & Storage Corporation designs high-reliability semiconductor solutions for automotive, industrial, and computing applications, with emphasis on AEC-Q100-compliant logic and analog ICs.
The 74VHC540FT belongs to Toshiba's VHC-series advanced CMOS logic family, engineered specifically for high-speed, low-power, mixed-voltage bus interfacing in harsh-environment embedded systems.
FAQ
What is the logic function of the 74VHC540FT?
The 74VHC540FT is an octal inverting bus buffer with 3-state outputs. Each of its eight channels inverts the input signal (A→Y) and drives the output only when both enable inputs G1 and G2 are low; otherwise, outputs enter high-impedance state. This behavior is confirmed in the functional description and truth table of the official Toshiba datasheet Rev. 8.0.B.
Does the 74VHC540FT support 3.3 V and 5 V mixed-voltage interfacing?
Yes, the 74VHC540FT supports mixed-voltage interfacing: its inputs tolerate 0–5.5 V regardless of VCC level, and it operates across VCC = 2.0–5.5 V. This allows direct connection between 5 V peripherals and 3.3 V controllers without external level shifters - a feature explicitly documented in Section 2 (General) and Absolute Maximum Ratings of the Toshiba datasheet.
Is the 74VHC540FT qualified for automotive applications?
Yes, the 74VHC540FT is AEC-Q100 Rev. H qualified (Grade 1), with guaranteed operation from −40 °C to +125 °C and reliability validation for automotive use. This qualification is stated in Section 3 (Features), Note 1, and reinforced in the Operating Ranges table (Topr = −40 to 125 °C).
What package type does the 74VHC540FT use?
The 74VHC540FT uses the TSSOP20B package: a 20-pin thin shrink small outline package with 4.4 mm × 6.5 mm body size and 0.65 mm lead pitch. Package dimensions and weight (0.071 g typ.) are specified in the "Package Dimensions" section of the Toshiba datasheet Rev. 8.0.B.
How does the enable logic work on the 74VHC540FT?
The 74VHC540FT uses dual active-low enable inputs (G1 and G2): outputs are active (inverting buffer enabled) only when both G1 and G2 are low; if either G1 or G2 is high, all eight outputs go to high-impedance state. This OR-gated enable structure is defined in the Truth Table (Section 8) and Functional Description (Section 1) of the Toshiba datasheet.
74VHC540FT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74VHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VHC540FT FAQ
1.How can I place an order for 74VHC540FT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC540FT 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 74VHC540FT reliable?
The price and inventory of 74VHC540FT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC540FT is usually 5 days.
3.What payment methods are accepted for 74VHC540FT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC540FT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC540FT?
74VHC540FT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC540FT 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 74VHC540FT?
For technical support, including 74VHC540FT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC540FT requirements.
6.How does Aetrix verify that 74VHC540FT is sourced from the original manufacturer or authorized distributors?
All 74VHC540FT 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 74VHC540FT meets industry standards.
7.What is the process for return or replacement of 74VHC540FT?
All 74VHC540FT units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC540FT, 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 74VHC540FT part is unused and in its original packaging.
Return procedure for 74VHC540FT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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