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STMicroelectronics 74VHC240MTR
- Part No.:
- 74VHC240MTR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74VHC240MTR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,051
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Product details
Overview
74VHC240MTR from STMicroelectronics is an advanced high-speed CMOS octal bus buffer with 3-state inverted outputs, designed for memory address driving and level translation between 5V and 3V systems. It features 3.6 ns typical propagation delay at 5V, ±8 mA output drive, 2V–5.5V operating range, and input tolerance up to 7V independent of VCC.
For engineers reviewing the 74VHC240MTR datasheet, 74VHC240MTR pinout, 74VHC240MTR application, or 74VHC240MTR equivalent, key selection criteria include 3-state enable timing (tPZL/tPLZ), noise immunity (28% VCC), power-down input protection, symmetrical output impedance, and TSSOP-20 package compatibility with legacy 74-series footprints.
Technical Context
This device implements two independent 4-bit inverting 3-state buffers, each controlled by a dedicated output-enable input (1G, 2G). All inputs accept 0–7V regardless of VCC, enabling robust hot-swap and mixed-voltage interfacing without external clamping.
It uses sub-micron C2MOS technology to achieve balanced tPLH ≈ tPHL propagation delays, low dynamic noise (VOLP ≤ 0.9V), and latch-up immunity exceeding JEDEC JESD78 requirements. Input hysteresis and ESD protection (2 kV HBM) are integrated on-die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 3.6 ns (typ.) at VCC = 5V, CL = 15 pF - enables >100 MHz bus operation with tight timing margins |
| Supply Voltage Range | 2.0 V to 5.5 V - supports single-supply operation across 3.3V and 5V logic domains |
| Output Drive | ±8 mA (min.) - sufficient to drive 50 Ω transmission lines or 10 LSTTL loads |
| Input Voltage Tolerance | 0 V to 7 V independent of VCC - allows safe interfacing with overvoltage or unpowered buses |
| Quiescent Current | 4 µA (max.) at TA = 25°C - minimizes standby power in battery-backed or low-power systems |
| ESD Immunity | 2 kV HBM - eliminates need for external transient protection in standard industrial environments |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial and automotive under-hood applications |
Pinout & Package
74VHC240MTR is housed in a 20-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, compliant with JEDEC MO-153 and RoHS. Package dimensions: 6.5 × 4.4 mm body, 1.05 mm max height, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Output Enable (1G, 2G) | Active-low enables respective 4-bit buffer group; high-impedance output when asserted |
| 2,4,6,8 / 11,13,15,17 | Data Inputs (1A1–1A4, 2A1–2A4) | Inverting inputs; tolerate 0–7V regardless of VCC for mixed-voltage interconnect |
| 3,5,7,9 / 12,14,16,18 | Data Outputs (1Y1–1Y4, 2Y1–2Y4) | Inverted, 3-state outputs; symmetrical |IOH| = IOL ≥ 8 mA ensures matched rise/fall times |
| 10 | GND | Ground reference for all I/O and internal circuitry; decoupling required within 5 mm |
| 20 | VCC | Positive supply; must be bypassed with 100 nF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Power-down input protection | Inputs remain protected and non-latching when VCC = 0V - enables hot-plug capability |
| High noise immunity | VNIH/VNIL ≥ 28% VCC - rejects common-mode noise in noisy industrial bus environments |
| Balanced propagation delays | |tPLH − tPHL| ≤ 1.0 ns - reduces skew-induced timing errors in parallel data paths |
| Low dynamic switching noise | VOLP ≤ 0.9 V (CL = 50 pF) - limits ground bounce in dense PCB layouts |
| Pin-compatible upgrade | Direct replacement for 74LS240/74HC240 with improved speed, drive, and voltage range |
Applications
| Memory Address Buffering | Level Translation Interface |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or Flash memory in embedded control systems. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing isolation, fanout expansion, and bus contention control during DMA cycles. Use Value: 3.6 ns propagation delay and ±8 mA drive ensure setup/hold compliance at 20 MHz address strobe rates. | Use Scenario: Interfacing 3.3V FPGA I/O banks to legacy 5V peripheral peripherals (e.g., UART transceivers, ADCs). IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer enabling safe signal translation without external level shifters. Use Value: 0–7V input tolerance and 2V–5.5V VCC range eliminate need for external biasing or clamping diodes. |
| Industrial Bus Isolation | Test Equipment Signal Conditioning |
Use Scenario: Isolating microprocessor data bus from noisy motor driver or relay control modules in PLC backplanes. IC Role / Device Role / Timing Role: 3-state enabled buffer preventing back-driving during fault conditions or module hot-swap. Use Value: Power-down protection and 2 kV ESD rating maintain integrity during field maintenance and electrical transients. | Use Scenario: Conditioning digital stimulus signals in automated test equipment (ATE) before routing to DUT pins. IC Role / Device Role / Timing Role: Low-skew, low-noise buffer ensuring clean edge fidelity and minimal jitter injection into sensitive measurement paths. Use Value: Balanced tPLH/tPHL and VOLP ≤ 0.9 V preserve signal integrity for sub-ns timing measurements. |
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 |
|---|---|---|---|
| 74VHC240M | SOP-20 package; 1.05 mm height vs. TSSOP's 1.05 mm max; same electrical specs | Preferred for through-hole prototyping or wave-soldered industrial boards | Select for manual assembly or legacy board designs requiring SOIC footprint |
| SN74LVC240APWR | Lower VCC range (1.65–3.6V); 3.3V-only optimized; 24 mA drive; different pinout | Not suitable for 5V systems or mixed-voltage translation | Choose only for pure 3.3V applications requiring higher drive and lower voltage operation |
Compared with 74VHC240MTR, the SOP-20 variant offers identical performance in larger footprint, while SN74LVC240APWR trades 5V compatibility and pin compatibility for enhanced 3.3V drive and lower static current - making it unsuitable as drop-in replacement but viable in new 3.3V-only designs.
Availability
74VHC240MTR is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, mixed-voltage signal conditioning, and test equipment design requiring stable component supply and long-term lifecycle support.
Supply support for 74VHC240MTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with broad analog, digital, and MEMS product portfolios.
The 74VHC series targets high-speed, low-power logic applications in industrial control, instrumentation, and computing infrastructure where reliability across wide temperature and voltage ranges is critical.
FAQ
Is 74VHC240MTR compatible with 5V TTL logic inputs?
Yes - its inputs tolerate 0–7V regardless of VCC, and VIH/VIL thresholds scale with VCC (e.g., VIH = 0.7VCC min at 5V). It drives standard TTL loads with ±8 mA output capability and meets LSTTL voltage thresholds at VCC = 5V.
Can 74VHC240MTR operate with VCC = 2.5V?
Yes - it is fully specified from 2.0 V to 5.5 V. At 2.5V, VOH ≥ 2.3V and VOL ≤ 0.35V (IOUT = ±4 mA), supporting reliable interfacing with 2.5V logic families while maintaining 3.6 ns propagation delay at 5V-equivalent speed grade.
What is the maximum capacitive load this device can drive reliably?
It is characterized up to 50 pF (AC specs), with tPLH/tPHL increasing from 3.6 ns to 7.5 ns at 5V. For loads >50 pF, derate timing margins and verify signal integrity; use series termination or reduce trace length to maintain edge fidelity and avoid ringing.
Does 74VHC240MTR require external pull-up or pull-down resistors on enable inputs?
No - inputs have no internal pull resistors, but their high-impedance nature (II ≤ ±1 µA) means external biasing is only needed if floating states must be avoided. In most systems, enable signals are actively driven by microcontrollers or logic gates.
74VHC240MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74VHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74VHC240MTR FAQ
1.How can I place an order for 74VHC240MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC240MTR 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 74VHC240MTR reliable?
The price and inventory of 74VHC240MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC240MTR is usually 5 days.
3.What payment methods are accepted for 74VHC240MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC240MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC240MTR?
74VHC240MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC240MTR 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 74VHC240MTR?
For technical support, including 74VHC240MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC240MTR requirements.
6.How does Aetrix verify that 74VHC240MTR is sourced from the original manufacturer or authorized distributors?
All 74VHC240MTR 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 74VHC240MTR meets industry standards.
7.What is the process for return or replacement of 74VHC240MTR?
All 74VHC240MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC240MTR, 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 74VHC240MTR part is unused and in its original packaging.
Return procedure for 74VHC240MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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