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onsemi 74VHC240N
- Part No.:
- 74VHC240N
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74VHC240N.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,570
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Product details
Overview
74VHC240N from ON Semiconductor is an octal inverting 3-STATE buffer/line driver with two active-low output enables (OE1, OE2), designed for bus interfacing and memory address register buffering in 2.0–5.5 V systems. It delivers 3.6 ns typical propagation delay at 5.0 V, 4 µA max quiescent ICC, and supports 5 V ↔ 3 V level translation via 0–7 V input tolerance.
For engineers reviewing the 74VHC240N datasheet, pinout, applications, or equivalent options, key selection criteria include its dual enable control, high noise immunity (28% VCC min), low dynamic output noise (VOLP ≤ 0.9 V), and compatibility with 74HC240 logic families in space-constrained SOIC-20 layouts.
Technical Context
The 74VHC240N implements eight independent inverting buffers, each with 3-STATE output controlled jointly by OE1 (pins 12, 14, 16, 18) and OE2 (pins 3, 5, 7, 9). Its silicon gate CMOS process enables TTL-compatible speed while maintaining CMOS power efficiency.
Input protection allows safe operation across mismatched supply domains - inputs tolerate –0.5 V to +7.0 V regardless of VCC, enabling robust interfacing between 5 V logic and 3 V subsystems or battery-backed circuits without external clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 5.5 V - supports mixed-voltage board designs including 3.3 V and 5 V rails |
| Propagation Delay | 3.6 ns (typ) at VCC = 5.0 V, CL = 15 pF - enables high-speed address/data bus buffering up to ~100 MHz toggle rates |
| Output Drive | ±8 mA at VCC = 4.5 V - sufficient to drive standard TTL loads or multiple CMOS inputs on shared buses |
| Quiescent ICC | 4 µA (max) at TA = 25°C - enables ultra-low standby power in battery-operated or energy-sensitive systems |
| Input Voltage Range | –0.5 V to +7.0 V - eliminates need for external level shifters when interfacing with overvoltage-tolerant peripherals |
| 3-STATE Off-State Current | ±0.25 µA (typ) at VCC = 5.5 V - minimizes leakage-induced bus contention during output disable |
Pinout & Package
74VHC240N is supplied in a 20-pin Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (Package Number M20B), with 1.27 mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable controls first and second group of four outputs respectively; both must be LOW for enabled state |
| 2–9 | I0–I7 | Inverting input terminals for eight buffer channels; logic HIGH yields HIGH-Z output unless enables active |
| 11–18 | O0–O7 | Inverting 3-STATE outputs; reflect inverted input state only when corresponding OE is LOW |
| 10 | GND | Ground reference for all internal circuitry and I/O |
| 20 | VCC | Positive supply rail; powers internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| High-speed CMOS architecture | 3.6 ns tPD at 5 V enables timing-critical bus isolation in microcontroller peripheral interfaces |
| Input overvoltage tolerance | 0–7 V input range allows direct connection to 5 V signals even when VCC = 3.3 V, eliminating level-shifter components |
| Dual independent 3-STATE enables | OE1 and OE2 partition outputs into two groups of four, supporting selective bus segment control in multi-drop configurations |
| Low dynamic output noise | VOLP ≤ 0.9 V ensures clean signal edges under capacitive load, reducing EMI and crosstalk in dense PCB layouts |
| Pin/function compatibility with 74HC240 | Enables drop-in replacement in legacy HC-based designs without layout or firmware changes |
Applications
| Microcontroller Bus Interface | Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating and driving 8-bit address/data lines between an MCU and external SRAM or flash memory. IC Role / Device Role / Timing Role: Inverting 3-STATE buffer providing bidirectional bus control with OE-gated output enable timing. Use Value: Enables clean signal integrity at >20 MHz clock rates while minimizing loading on MCU GPIO pins via high-impedance disable state. |
Use Scenario: Driving multiplexed address lines to a 74LS series decoder or latch in industrial control modules. IC Role / Device Role / Timing Role: Level-translating octal buffer translating 3.3 V MCU outputs to 5 V TTL-compatible inputs. Use Value: Eliminates discrete level-shifting resistors and reduces BOM count while maintaining setup/hold timing margins. |
| Legacy System Upgrades | Industrial I/O Expansion |
|
Use Scenario: Replacing obsolete 74LS240 in aging test equipment requiring lower power and higher noise immunity. IC Role / Device Role / Timing Role: Pin-compatible CMOS upgrade delivering identical logic function with improved DC specs and thermal stability. Use Value: Extends system lifecycle without redesign; reduces power consumption by >95% versus LS equivalents at same frequency. |
Use Scenario: Buffering digital I/O expansion signals in programmable logic controllers with mixed-voltage backplanes. IC Role / Device Role / Timing Role: Dual-enable octal driver isolating field-side signals from controller-side logic under varying supply conditions. Use Value: Prevents ground loop coupling and enables hot-swap-safe enable sequencing via independent OE control. |
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 |
|---|---|---|---|
| 74HC240D | Same pinout and logic function; slightly slower (tPD = 8 ns typ @ 5 V), higher ICC (80 µA max) | Acceptable where speed < 25 MHz and power budget allows higher static draw | Preferred for cost-sensitive, non-speed-critical upgrades from 74LS240 |
| SN74LVC240APWR | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), smaller TSSOP-20 package | Requires level shifting for 5 V systems; better suited for modern low-voltage FPGA/CPU I/O banks | Recommended when migrating to 3.3 V-only architectures with tighter board area constraints |
Compared with 74HC240D and SN74LVC240APWR, the 74VHC240N uniquely bridges 2.0–5.5 V operation, offers best-in-class speed/power tradeoff (3.6 ns / 4 µA), and maintains full 5 V tolerance - making it optimal for mixed-supply industrial and legacy-compatible designs where voltage flexibility and low quiescent current are critical.
Availability
74VHC240N is available at Aetrix Electronics and suitable for microcontroller bus interface, memory address buffering, legacy system upgrades, and industrial I/O expansion requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°C).
Supply support for 74VHC240N 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, sensors, and logic solutions for automotive, industrial, cloud computing, and consumer markets.
The 74VHC240N belongs to ON Semiconductor's legacy high-speed CMOS logic family, engineered for reliable bus interfacing and voltage-level translation in mixed-signal embedded systems where speed, low power, and rugged I/O are essential.
FAQ
What is the operating voltage range for the 74VHC240N?
The 74VHC240N operates across a supply voltage range of 2.0 V to 5.5 V. This wide range supports interoperability between 3.3 V and 5 V logic domains. Its inputs tolerate –0.5 V to +7.0 V independently of VCC, enabling safe interfacing with overvoltage sources without external protection components. This specification is validated per the Fairchild/ON Semiconductor datasheet Rev. 1.3.
Does the 74VHC240N support true 3-STATE output control?
Yes, the 74VHC240N provides true 3-STATE (high-impedance) outputs controlled by two active-low enables: OE1 (pins 12, 14, 16, 18) and OE2 (pins 3, 5, 7, 9). When either enable is HIGH, the corresponding group of four outputs enters high-impedance state. Both enables must be LOW for functional output. This behavior is confirmed in the truth tables and AC electrical characteristics section of the 74VHC240N datasheet.
Is the 74VHC240N pin-compatible with the 74HC240?
Yes, the 74VHC240N is explicitly stated as pin and function compatible with the 74HC240 in its official datasheet. Both devices share identical pin assignments, logic behavior, and SOIC-20 packaging. This allows direct substitution in existing 74HC240 designs without PCB or firmware modifications, provided timing and voltage requirements align with the 74VHC240N's enhanced performance.
What is the maximum output drive capability of the 74VHC240N?
The 74VHC240N delivers ±8 mA output current per channel at VCC = 4.5 V, as specified in its DC Electrical Characteristics table. This drive strength supports fan-out to multiple CMOS loads or direct interfacing with standard TTL inputs. The device maintains this capability across its full operating temperature range (–40°C to +85°C), ensuring consistent performance in industrial environments.
Can the 74VHC240N be used in battery-backed systems?
Yes, the 74VHC240N is well-suited for battery-backed systems due to its ultra-low quiescent supply current of 4 µA (max) at 25°C and input protection that permits 0–7 V input voltages regardless of VCC. This allows seamless integration with backup supplies or brown-out scenarios where main and auxiliary rails may differ - a feature verified in the General Description and Absolute Maximum Ratings sections of the 74VHC240N datasheet.
74VHC240N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74VHC240N FAQ
1.How can I place an order for 74VHC240N through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC240N 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 74VHC240N reliable?
The price and inventory of 74VHC240N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC240N is usually 5 days.
3.What payment methods are accepted for 74VHC240N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC240N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC240N?
74VHC240N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC240N 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 74VHC240N?
For technical support, including 74VHC240N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC240N requirements.
6.How does Aetrix verify that 74VHC240N is sourced from the original manufacturer or authorized distributors?
All 74VHC240N 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 74VHC240N meets industry standards.
7.What is the process for return or replacement of 74VHC240N?
All 74VHC240N units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC240N, 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 74VHC240N part is unused and in its original packaging.
Return procedure for 74VHC240N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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