My Inquiry
My Account
onsemi 74VHC240SJX
- Part No.:
- 74VHC240SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74VHC240SJX.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,925
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74VHC240SJX from ON Semiconductor is an octal inverting 3-STATE buffer/line driver with dual 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 quiescent current, and supports 5V-to-3V level translation via 0–7V input tolerance.
For engineers reviewing the 74VHC240SJX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3-STATE disable timing (≤10.5ns), high noise immunity (28% VCC), low dynamic output noise (VOLP ≤ 0.9V), and compatibility with 74HC240 logic families in SOP-20 packaging.
Technical Context
The 74VHC240SJX implements silicon-gate CMOS technology to achieve TTL-compatible speed with CMOS power efficiency. Its dual independent 3-STATE enables allow selective control of two groups of four outputs (O0–O3 and O4–O7), each inverted relative to their respective inputs (I0–I3 and I4–I7).
Input protection enables safe operation across mixed-supply environments: inputs tolerate –0.5V to +7.0V regardless of VCC, supporting battery-backup interfaces and 5V-to-3V system bridging without external clamping. Output drive capability is ±8mA at VCC = 4.5V with VOL ≤ 0.44V and VOH ≥ 3.80V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual active-low 3-STATE enables (OE1, OE2) |
| Propagation Delay | 3.6ns typical at VCC = 5.0V, CL = 15pF - enables high-speed bus timing in 20–30MHz address/data paths |
| Supply Voltage Range | 2.0V to 5.5V - supports single-supply operation across 3.3V and 5V logic domains |
| Input Voltage Tolerance | –0.5V to +7.0V - allows safe interfacing between 5V, 3.3V, and battery-backed subsystems |
| Output Drive | ±8mA at VCC = 4.5V - sufficient to drive 50pF loads with <10ns edge rates in backplane or PCB trace applications |
| Quiescent Current | 4µA max at TA = 25°C - enables ultra-low standby power in portable or energy-sensitive systems |
| Noise Immunity | VNIH/VNIL ≥ 28% VCC - ensures robust operation in electrically noisy industrial control environments |
Pinout & Package
74VHC240SJX is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Code M20D), with standard 0.5mm lead pitch and gull-wing terminations suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enable inputs controlling outputs O0–O3 and O4–O7 respectively |
| 2, 4, 6, 8, 11, 13, 15, 17 | I0–I7 | Inverting input terminals - logic HIGH produces LOW output; all support 0–7V input tolerance |
| 3, 5, 7, 9, 12, 14, 16, 18 | O0–O7 | 3-STATE inverting outputs - high-impedance when corresponding OE is HIGH |
| 10 | GND | Ground reference for all internal circuitry and I/O |
| 20 | VCC | Positive supply rail (2.0–5.5V); powers internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Pin & function compatibility with 74HC240 | Enables drop-in replacement in legacy HC-based designs without layout or firmware changes |
| Power-down input protection | Prevents latch-up or damage when VCC = 0V but inputs remain biased - critical for hot-swap or partial-power-down systems |
| Low dynamic output noise (VOLP ≤ 0.9V) | Minimizes ground bounce and signal integrity degradation in dense multi-driver bus environments |
| Guaranteed 3-STATE disable time ≤10.5ns | Ensures clean bus release timing in shared-memory or multiplexed address/data architectures |
| High noise immunity (28% VCC min.) | Reduces susceptibility to EMI-induced glitches in motor drives, PLCs, and industrial I/O modules |
Applications
| Industrial PLC Backplane Interface | Memory Address Buffering |
|---|---|
Use Scenario: Driving parallel address lines between microcontroller and SRAM/Flash in programmable logic controllers subject to EMI and voltage transients. IC Role / Device Role / Timing Role: Inverting 3-STATE buffer isolating CPU address bus from memory module; enables/disables per OE1/OE2 during read/write cycles. Use Value: 28% VCC noise margin and ±8mA drive ensure reliable decoding under 2kV ESD events; 3.6ns tPD supports >25MHz memory access timing. |
Use Scenario: Buffering 16-bit address register outputs in embedded instrumentation with multiple memory banks. IC Role / Device Role / Timing Role: Octal inverting line driver providing fanout gain and bus isolation; dual OE pins allow bank-selective enabling. Use Value: 4µA ICC enables low-power sleep mode; 0–7V input tolerance permits direct connection to backup battery monitoring circuits. |
| 5V-to-3.3V Level Translation | Legacy TTL Bus Expansion |
Use Scenario: Interfacing 5V microcontroller GPIOs to 3.3V peripheral ICs (e.g., ADCs, sensors) in mixed-voltage data acquisition systems. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer - accepts 5V inputs while sourcing/sinking into 3.3V loads via VCC = 3.3V configuration. Use Value: Input tolerance eliminates need for external level shifters; VOL ≤ 0.44V at 3.3V guarantees valid LOW to 3.3V receivers. |
Use Scenario: Expanding address/data bus capacity in retro-computing or test equipment using obsolete TTL logic families. IC Role / Device Role / Timing Role: Pin-compatible CMOS replacement for 74LS240/74HC240 - provides identical pinout and logic function with lower power and higher speed. Use Value: 3.6ns tPD improves timing margin over 74LS240 (25ns); 4µA ICC reduces board-level heat vs. bipolar TTL equivalents. |
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 |
|---|---|---|---|
| 74VHC240MTCX | TSSOP-20 package (4.4mm wide); 1.5mm height - 35% smaller footprint than SOP-20 | Better suited for space-constrained portable or wearable designs; same electrical specs and pinout | Select when PCB real estate is limited and automated assembly supports TSSOP handling |
| SN74LVC240APWR | Lower VCC range (1.65–3.6V); 3.3V-only optimized; 3.5ns tPD at 3.3V | Not suitable for 5V systems; superior performance only in pure 3.3V domains | Choose only for new 3.3V-only designs requiring lowest possible propagation delay and power |
Compared with 74VHC240SJX, the 74VHC240MTCX offers identical functionality in a smaller TSSOP package, while the SN74LVC240APWR trades 5V compatibility for faster 3.3V operation - making the 74VHC240SJX optimal for mixed-voltage or legacy 5V system upgrades.
Availability
74VHC240SJX is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory address buffering, 5V-to-3.3V level translation, and legacy TTL bus expansion requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for 74VHC240SJX 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 (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The 74VHC240SJX belongs to the VHC (Very High Speed CMOS) logic family, engineered to deliver TTL-speed performance with CMOS power efficiency for bus interface and signal conditioning in cost-sensitive, high-reliability applications.
FAQ
What is the operating temperature range for the 74VHC240SJX?
The 74VHC240SJX is rated for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is validated across all DC and AC specifications including propagation delay, output drive, and 3-STATE timing - ensuring reliability in factory automation, outdoor equipment, and transportation electronics where ambient temperatures fluctuate widely. The 74VHC240SJX maintains specified performance without derating within this full range.
Does the 74VHC240SJX support 5V logic systems?
Yes, the 74VHC240SJX fully supports 5V logic systems with a VCC range of 2.0V to 5.5V and guaranteed operation at 5.0V ± 0.5V. At VCC = 5.0V, it delivers 3.6ns typical propagation delay, ±8mA output drive, and VOH ≥ 3.80V/ VOL ≤ 0.44V - satisfying standard TTL and CMOS 5V interface thresholds. The 74VHC240SJX is explicitly designed as a pin- and function-compatible upgrade to 74HC240 in 5V applications.
Can the 74VHC240SJX be used for level translation between 5V and 3.3V systems?
Yes, the 74VHC240SJX supports bidirectional level translation due to its input voltage tolerance of –0.5V to +7.0V independent of VCC. When powered at VCC = 3.3V, it safely accepts 5V inputs and produces 3.3V-compatible outputs (VOH ≥ 2.9V, VOL ≤ 0.44V). This eliminates external level-shifting components in mixed-voltage designs such as MCU-peripheral interfaces - a core capability confirmed in the device's General Description and Absolute Maximum Ratings.
What is the maximum output current rating for the 74VHC240SJX?
The 74VHC240SJX has a DC output current rating of ±25mA per pin, with guaranteed switching performance up to ±8mA at VCC = 4.5V (VOL ≤ 0.44V, VOH ≥ 3.80V). This ±8mA drive strength is validated across the full operating temperature range and supports standard 50pF bus loads with sub-10ns edge rates. Exceeding ±8mA may degrade VOL/VOH but remains within absolute maximum limits for short-duration pulses.
Is the 74VHC240SJX pin-compatible with the 74HC240?
Yes, the 74VHC240SJX is explicitly stated in its datasheet to be pin and function compatible with the 74HC240. Both devices share identical 20-pin SOP (M20D) pinouts, logic behavior (inverting octal buffer with dual active-low OE), and electrical interface characteristics. This compatibility enables direct replacement in existing 74HC240 designs to improve speed (3.6ns vs. ~8ns) and reduce quiescent current (4µA vs. ~20µA) without PCB or firmware modifications.
74VHC240SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOP
74VHC240SJX FAQ
1.How can I place an order for 74VHC240SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC240SJX 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 74VHC240SJX reliable?
The price and inventory of 74VHC240SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC240SJX is usually 5 days.
3.What payment methods are accepted for 74VHC240SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC240SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC240SJX?
74VHC240SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC240SJX 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 74VHC240SJX?
For technical support, including 74VHC240SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC240SJX requirements.
6.How does Aetrix verify that 74VHC240SJX is sourced from the original manufacturer or authorized distributors?
All 74VHC240SJX 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 74VHC240SJX meets industry standards.
7.What is the process for return or replacement of 74VHC240SJX?
All 74VHC240SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC240SJX, 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 74VHC240SJX part is unused and in its original packaging.
Return procedure for 74VHC240SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74VHC240SJX 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…
