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onsemi 74VHC240MTC
- Part No.:
- 74VHC240MTC
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHC240MTC.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,317
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Product details
Overview
74VHC240MTC from ON Semiconductor is an inverting octal 3-STATE buffer/line driver with two active-LOW output enables (OE1, OE2), designed for bus driving and memory address buffering in 2.0–5.5V systems. It delivers 3.6ns typical propagation delay at 5V, 4µA max ICC at 25°C, and supports 5V-to-3V level translation via 0V–7V input tolerance.
For engineers reviewing the 74VHC240MTC datasheet, pinout, applications, or equivalent options, key selection criteria include its TSSOP-20 package footprint, dual enable control logic, guaranteed 8mA drive strength per output, and compatibility with legacy 74HC240 designs while offering improved noise immunity and lower power.
Technical Context
The 74VHC240MTC implements silicon gate CMOS technology to achieve TTL-compatible speed without bipolar power penalties. Its dual independent 3-STATE enables allow selective activation of two groups of four outputs (O0–O3 and O4–O7), supporting partial bus control in multiplexed memory or data paths.
Input protection circuitry permits safe operation across mismatched supply domains - inputs tolerate –0.5V to +7.0V regardless of VCC, enabling robust interfacing between 3.3V and 5V subsystems or battery-backed circuits without external clamping diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0V to 5.5V - supports mixed-voltage system interfacing and low-power 3.3V operation |
| tPD (Typ) | 3.6ns at VCC = 5.0V, CL = 15pF - enables high-speed address/data buffering in microcontroller buses |
| IOL/IOH | ±8mA at VCC = 4.5V - drives standard TTL loads and multiple CMOS inputs without fanout limitation |
| VIN Range | –0.5V to +7.0V - eliminates need for external level-shifting or clamping in 5V↔3V translation |
| ICC (Max) | 4µA at TA = 25°C - enables ultra-low static power in battery-powered or standby-critical applications |
| VIH/VIL | 0.7×VCC / 0.3×VCC - provides 28% noise margin at 5V, ensuring reliable logic thresholds under EMI |
| Package | TSSOP-20 (JEDEC MO-153, 4.4mm wide) - surface-mount footprint compatible with automated PCB assembly |
Pinout & Package
74VHC240MTC uses a 20-pin Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm body width, 0.65mm lead pitch, and exposed pad not present - suitable for high-density PCB layouts with thermal performance matching SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-LOW enables controlling first and second group of four outputs independently |
| 2–9 | I0–I7 | Inverting input terminals for eight buffered signals; tolerant to 0V–7V regardless of VCC |
| 11–18 | O0–O7 | Inverting 3-STATE outputs; each sinks/sours ±8mA and exhibits <0.44V VOL at full load |
| 10 | GND | Ground reference for all I/O and internal logic; decoupling capacitor required adjacent to pin |
| 20 | VCC | Positive supply rail (2.0–5.5V); must be bypassed with 0.1µF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| High-speed CMOS architecture | 3.6ns tPD at 5V enables use in 100+ MHz bus timing margins without added delay compensation |
| Input overvoltage tolerance | 0V to 7V input range allows direct connection to 5V logic even when VCC = 3.3V - no level shifter needed |
| Low dynamic noise | VOLP ≤ 0.9V ensures <1V ground bounce during simultaneous switching, critical for signal integrity |
| Power-down input protection | Inputs remain protected and non-latching even when VCC = 0V - prevents backfeeding or latch-up in powered-down systems |
| PIN-to-PIN compatibility | Pinout and function match 74HC240, enabling drop-in replacement in existing designs with identical layout |
Applications
| Memory Address Buffering | Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from an 8-bit microcontroller with external RAM/ROM expansion. IC Role / Device Role / Timing Role: Inverting octal buffer providing controlled 3-STATE isolation between CPU and memory during read/write cycles. Use Value: Dual OE pins allow staggered enable timing to reduce simultaneous switching noise on shared address bus segments. |
Use Scenario: Interfacing a 3.3V ARM Cortex-M0+ MCU to legacy 5V peripheral ICs (e.g., UART transceivers, LCD controllers). IC Role / Device Role / Timing Role: Level-translating buffer with bidirectional voltage tolerance, eliminating discrete resistor networks or dedicated translators. Use Value: Input voltage range (–0.5V to +7.0V) enables safe 5V signal reception while operating at 3.3V VCC - no external components required. |
| Industrial Control Backplane | Test Equipment Signal Conditioning |
|
Use Scenario: Isolating and driving parallel I/O lines across a noisy industrial backplane with mixed 3.3V/5V modules. IC Role / Device Role / Timing Role: Octal 3-STATE line driver with high noise immunity (28% VCC margin) and ±8mA drive capability. Use Value: Guaranteed VOL ≤ 0.44V at 8mA ensures clean LOW-level signaling despite ground shifts up to 400mV in electrically harsh environments. |
Use Scenario: Conditioning digital stimulus signals in automated test equipment where precise timing and low skew are essential. IC Role / Device Role / Timing Role: High-speed inverting buffer minimizing propagation delay variation across channels (tOSHL ≤ 1.0ns). Use Value: Output-to-output skew <1.0ns at 5V ensures synchronized edge delivery across all eight outputs for deterministic pattern generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC240PW,118 | TSSOP-20 package, but slower tPD = 10ns (typ) at 5V; higher ICC = 80µA (max) | Lacks 0V–7V input tolerance - requires external clamping for 5V→3.3V interface | Select when cost sensitivity outweighs speed/power needs and level translation is handled elsewhere |
| SN74LVC240APWR | 3.3V-only VCC range (1.65–3.6V); 3.5ns tPD (typ); 24mA drive; no 7V input tolerance | Not suitable for 5V system interfacing; requires separate 3.3V rail and level shifters for mixed-voltage use | Prefer for pure 3.3V systems needing higher drive strength and tighter timing control |
Compared with 74HC240PW,118 and SN74LVC240APWR, the 74VHC240MTC uniquely combines 5V-system compatibility, ultra-low quiescent current, and input overvoltage tolerance - making it the only choice for robust, mixed-voltage bus buffering without auxiliary components.
Availability
74VHC240MTC is available at Aetrix Electronics and suitable for memory expansion systems, industrial PLC backplanes, microcontroller peripheral interfaces, and automated test equipment requiring stable component supply and long-term manufacturability.
Supply support for 74VHC240MTC 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and computing markets.
The 74VHC240MTC belongs to the legacy VHC logic family acquired from Fairchild Semiconductor, engineered for high-speed, low-power, mixed-voltage digital interfacing in space-constrained industrial and embedded applications.
FAQ
What is the maximum operating temperature range for the 74VHC240MTC?
The 74VHC240MTC is rated for continuous operation from –40°C to +85°C under recommended conditions. This industrial temperature range ensures reliability in embedded controllers, factory automation hardware, and outdoor instrumentation where ambient temperatures fluctuate widely. All DC and AC specifications in the datasheet are validated across this full range.
Does the 74VHC240MTC support 5V-to-3.3V level translation without external components?
Yes - the 74VHC240MTC supports true 5V-to-3.3V level translation without resistors or additional ICs. Its inputs tolerate –0.5V to +7.0V independent of VCC, so applying 5V signals while powering VCC at 3.3V is fully specified and safe. Outputs swing rail-to-rail (0V to VCC), delivering valid 3.3V logic levels to downstream devices.
Is the 74VHC240MTC pin-compatible with the 74HC240 series?
Yes - the 74VHC240MTC is pin- and function-compatible with the 74HC240 family, including identical pin numbering, signal assignments, and logic behavior. This allows direct replacement in existing PCB layouts. However, the 74VHC240MTC offers superior speed (3.6ns vs. ~10ns), lower ICC (4µA vs. 80µA), and enhanced input voltage tolerance.
What is the output drive capability of the 74VHC240MTC at 3.3V supply?
At VCC = 3.3V, the 74VHC240MTC guarantees ±6mA output drive (IOL/IOH) per channel with VOL ≤ 0.36V and VOH ≥ 2.97V. This meets standard LVTTL and 3.3V CMOS input thresholds and supports fanout to ≥10 74LVC inputs or direct driving of small-signal LEDs with current-limiting resistors.
Can unused inputs on the 74VHC240MTC be left floating?
No - unused inputs on the 74VHC240MTC must be terminated to a defined logic level (VCC or GND) per datasheet requirement. Floating inputs can cause increased ICC, erratic output states, or oscillation due to CMOS input stage metastability. Tie-off resistors (10kΩ to VCC or GND) are recommended for unconnected I0–I7 and OE1/OE2 pins.
74VHC240MTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VHC240MTC FAQ
1.How can I place an order for 74VHC240MTC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC240MTC 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 74VHC240MTC reliable?
The price and inventory of 74VHC240MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC240MTC is usually 5 days.
3.What payment methods are accepted for 74VHC240MTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC240MTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC240MTC?
74VHC240MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC240MTC 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 74VHC240MTC?
For technical support, including 74VHC240MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC240MTC requirements.
6.How does Aetrix verify that 74VHC240MTC is sourced from the original manufacturer or authorized distributors?
All 74VHC240MTC 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 74VHC240MTC meets industry standards.
7.What is the process for return or replacement of 74VHC240MTC?
All 74VHC240MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC240MTC, 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 74VHC240MTC part is unused and in its original packaging.
Return procedure for 74VHC240MTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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