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Toshiba Semiconductor and Storage 74VHCT240AFT
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- Part No.:
- 74VHCT240AFT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHCT240AFT.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,216
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Product details
Overview
74VHCT240AFT from Toshiba Electronic Devices & Storage Corporation is an octal inverting 3-state buffer IC with two active-low output enables, designed for bidirectional bus interfacing in 5 V TTL-compatible systems. It delivers 6.1 ns typical propagation delay at 5.0 V, supports -40°C to +125°C operation, and features ±20 mA output drive capability-enabling use in automotive control modules requiring robust level translation between 3.3 V logic and 5 V buses.
For engineers reviewing the 74VHCT240AFT datasheet, 74VHCT240AFT pinout, 74VHCT240AFT application, or 74VHCT240AFT equivalent, key selection criteria include its AEC-Q100 qualification, TSSOP20B package footprint, inverting logic function, 3-state timing symmetry (tPLH ≈ tPHL), and input/output voltage tolerance up to 5.5 V independent of VCC.
Technical Context
The 74VHCT240AFT implements eight independent inverting buffer channels, each controlled by one of two shared active-low 3-state enable inputs (1G and 2G). Its C2MOS silicon gate process enables TTL-level input compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V) while maintaining CMOS quiescent current (ICC ≤ 4.0 µA at 25°C).
It provides rail-to-rail input/output voltage tolerance (–0.5 V to 7.0 V), power-down protection on all pins, and balanced AC performance: tPZL/tPZH ≤ 8.4 ns and tPLZ/tPHZ ≤ 11.4 ns (Ta = –40°C to +85°C, CL = 50 pF), making it suitable for hot-swap-capable memory address/data bus drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual active-low 3-state enables (1G, 2G) |
| Propagation Delay | 6.1 ns typ. at VCC = 5.0 V, CL = 15 pF - enables high-speed bus arbitration in real-time control systems |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V rail; tolerant of ±10% regulation variation |
| Output Drive | ±8 mA at VOL ≤ 0.5 V / VOH ≥ 3.94 V - sufficient to drive 50 Ω transmission lines or multiple TTL loads |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Rev. H for under-hood automotive applications |
| Input Compatibility | TTL-level: VIH ≥ 2.0 V, VIL ≤ 0.8 V - allows direct interface with legacy 74LS/74ALS outputs without level shifters |
| IOZ (Off-State Leakage) | ≤ 0.1 µA at VCC = 4.5 V - ensures minimal bus contention during 3-state disable in multiplexed systems |
Pinout & Package
Package: TSSOP20B (0.65 mm pitch, 6.5 mm × 4.4 mm body, 0.9 mm max height, 0.071 g typical weight).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1G) | Active-low enable for channels 1Y–4Y | Drives all four inverting outputs into high-impedance when HIGH; must be pulled LOW for functional operation |
| 2–5, 13–16 (1A–4A, 5A–8A) | Input terminals | Eight logic inputs accepting TTL-compatible voltages; internally protected against overvoltage (–0.5 V to 7.0 V) |
| 6–9, 17–20 (1Y–4Y, 5Y–8Y) | Inverting 3-state outputs | Each Yn = NOT(An) when respective G is LOW; enters high-Z when G is HIGH - enables bidirectional bus sharing |
| 10 (2G) | Active-low enable for channels 5Y–8Y | Independent control of second quad; allows split-bus gating without external logic |
| 11 (GND) | Ground reference | Common return for all internal circuitry; requires low-inductance connection to minimize ground bounce |
| 20 (VCC) | Positive supply | 5 V nominal supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Complies with Rev. H stress test requirements - validated for automotive powertrain and chassis ECUs |
| Rail-tolerant I/O | Inputs and outputs withstand –0.5 V to 7.0 V regardless of VCC - prevents latch-up during hot insertion or battery backup transitions |
| Low dynamic noise | VOLP ≤ 1.0 V (CL = 50 pF) - reduces crosstalk in dense PCB layouts with adjacent signal traces |
| Matched propagation delays | tPLH ≈ tPHL - minimizes skew across all eight channels, critical for synchronous bus timing integrity |
| PIN- and FUNCTION-compatible | Drop-in replacement for industry-standard 74ACT240, 74HCT240, and 74AHCT240 in TSSOP20B footprint |
Applications
| Automotive Body Control Module | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from high-current CAN/LIN transceiver control lines and relay driver arrays. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled signal isolation and bus contention prevention during firmware updates. Use Value: AEC-Q100 qualification and –40°C to +125°C operation ensure reliable operation in engine bay-mounted controllers without derating. |
Use Scenario: Expanding discrete input/output capacity of a 24 V DC PLC rack via 5 V logic-level translation to field sensors and actuators. IC Role / Device Role / Timing Role: Octal buffer enabling parallel read/write of 8-bit status registers while preventing backfeed into the CPU bus during configuration mode. Use Value: Dual independent enables (1G/2G) allow staggered activation of sensor banks, reducing inrush current on shared 5 V rails. |
| Server Baseboard Management Controller (BMC) | Medical Diagnostic Equipment Backplane |
|
Use Scenario: Interfacing a 3.3 V ARM-based BMC to legacy 5 V SMBus peripherals (temperature sensors, fan controllers). IC Role / Device Role / Timing Role: Level-shifting buffer with TTL-compatible inputs, allowing direct connection without external voltage translators. Use Value: Input voltage tolerance up to 5.5 V permits safe operation even if 5 V peripherals power up before the 3.3 V BMC core. |
Use Scenario: Driving diagnostic imaging subsystems (ultrasound beamformers, X-ray detector interfaces) requiring precise timing alignment across 8-channel analog front-end control lines. IC Role / Device Role / Timing Role: Synchronized inverting buffer ensuring matched tPLH/tPHL across all channels to maintain sub-nanosecond skew in time-critical trigger paths. Use Value: Balanced propagation delays and low output skew (tosLH ≤ 11.4 ns) preserve deterministic timing for multi-channel acquisition synchronization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74VHCT240AM | Same logic function and specs, but in SOIC-20 package (3.9 mm × 9.9 mm); no AEC-Q100 certification | Lacks automotive qualification; unsuitable for under-hood deployment but lower cost for industrial benchtop equipment | Select 74VHCT240AM only when board space allows larger SOIC footprint and AEC-Q100 is not required. |
| SN74HCT240PWR | Texas Instruments part in TSSOP-20; identical pinout and logic, but max operating temperature is –40°C to +85°C and ICC = 8 µA (max) | Not qualified for extended temperature automotive use; higher quiescent current impacts battery-powered portable diagnostics | Choose SN74HCT240PWR only for commercial-grade applications where 125°C operation and ultra-low ICC are noncritical. |
Compared with 74VHCT240AFT, the 74VHCT240AM offers identical functionality in a larger SOIC package without automotive qualification, while the SN74HCT240PWR provides pin-compatible operation but lacks AEC-Q100 compliance and high-temperature support-making 74VHCT240AFT the sole choice for thermally demanding, safety-critical automotive deployments.
Availability
74VHCT240AFT is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC expansion, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT240AFT 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 markets, with emphasis on AEC-Q100-qualified logic and power devices.
The 74VHCT240AFT belongs to Toshiba's VHCT family of high-speed CMOS buffers, engineered specifically for noise-immune, temperature-resilient bus interfacing in safety-critical automotive and industrial control systems.
FAQ
What is the maximum supply voltage rating for the 74VHCT240AFT?
The 74VHCT240AFT has an absolute maximum supply voltage (VCC) rating of –0.5 V to +7.0 V. However, its specified operating range is strictly 4.5 V to 5.5 V. Operation outside this range may cause undefined behavior or permanent damage, even if within absolute limits. Always regulate VCC to 5.0 V ±10% for guaranteed performance and reliability in the 74VHCT240AFT.
Does the 74VHCT240AFT support hot-plug operation?
Yes, the 74VHCT240AFT supports hot-plug operation due to its rail-tolerant I/O structure: inputs and outputs tolerate –0.5 V to +7.0 V independent of VCC. This prevents latch-up or damage when signals are applied before VCC stabilizes, such as during board insertion into live backplanes. The 74VHCT240AFT also includes power-down protection on all pins to further enhance robustness in dynamic environments.
Is the 74VHCT240AFT pin-compatible with standard 74-series 240 buffers?
Yes, the 74VHCT240AFT is pin- and function-compatible with industry-standard 74ACT240, 74HCT240, and 74AHCT240 devices in the TSSOP20B package. Its pin assignment matches the JEDEC-standard 20-pin layout for octal inverting buffers, including identical placement of VCC (pin 20), GND (pin 11), dual enables (pins 1 and 10), and I/O pairs. No PCB redesign is needed when upgrading to the 74VHCT240AFT from these predecessors.
What is the significance of the 'AFT' suffix in 74VHCT240AFT?
The 'AFT' suffix in 74VHCT240AFT denotes Toshiba's automotive-grade packaging variant: 'A' indicates AEC-Q100 qualification, 'F' specifies the TSSOP20B package, and 'T' signifies tape-and-reel packaging for automated SMT assembly. This distinguishes it from commercial variants like 'AM' (SOIC-20) or 'PW' (TSSOP-20 without AEC-Q100). The 74VHCT240AFT is therefore the only version certified for automotive under-hood use.
Can the 74VHCT240AFT interface directly between 3.3 V and 5 V logic domains?
Yes, the 74VHCT240AFT can serve as a unidirectional level translator from 3.3 V logic to 5 V buses. Its TTL-compatible inputs accept VIH ≥ 2.0 V and VIL ≤ 0.8 V, allowing direct connection to 3.3 V CMOS outputs. Its outputs swing fully to 5 V logic levels (VOH ≥ 3.94 V at 4.5 V VCC), driving standard 5 V loads. However, it does not translate 5 V → 3.3 V; for bidirectional translation, external resistive dividers or dedicated level shifters are required alongside the 74VHCT240AFT.
74VHCT240AFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74VHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VHCT240AFT FAQ
1.How can I place an order for 74VHCT240AFT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT240AFT 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 74VHCT240AFT reliable?
The price and inventory of 74VHCT240AFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT240AFT is usually 5 days.
3.What payment methods are accepted for 74VHCT240AFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT240AFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT240AFT?
74VHCT240AFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT240AFT 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 74VHCT240AFT?
For technical support, including 74VHCT240AFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT240AFT requirements.
6.How does Aetrix verify that 74VHCT240AFT is sourced from the original manufacturer or authorized distributors?
All 74VHCT240AFT 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 74VHCT240AFT meets industry standards.
7.What is the process for return or replacement of 74VHCT240AFT?
All 74VHCT240AFT units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT240AFT, 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 74VHCT240AFT part is unused and in its original packaging.
Return procedure for 74VHCT240AFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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