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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

STMicroelectronics 74VHC16240TTR

Name: 74VHC16240TTR
Brand: STMicroelectronics
SKU: 74VHC16240TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHC16240TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: 74VHC16240TTR.pdf

Description:: IC BUFFER INVERT 5.5V 48TSSOP

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Product details

Overview

74VHC16240TTR from STMicroelectronics is a 16-bit inverted bus buffer with 3-state outputs, designed for high-speed bidirectional data routing in memory address and data bus systems. It operates from 2V to 5.5V, delivers 5.3 ns typical propagation delay at 5V, supports ±8 mA symmetrical output drive, and features power-down protection enabling 0–7V input tolerance independent of VCC.

For engineers reviewing the 74VHC16240TTR datasheet, 74VHC16240TTR pinout, 74VHC16240TTR application, or 74VHC16240TTR equivalent, key selection criteria include 3-state timing symmetry (tPLH ≅ tPHL), high noise immunity (28% VCC), latch-up robustness, ESD tolerance (2 kV), and 5V-to-3V interface capability.

Technical Context

This device implements four independent 4-bit inverting buffers, each controlled by a dedicated active-low Output Enable (nG) input. All 16 outputs are inverted relative to their corresponding inputs, and all inputs/outputs feature overvoltage-tolerant clamping diodes and ESD protection structures.

It uses sub-micron C2MOS silicon gate technology with double-layer metal wiring, enabling low ICC (4 µA max) and balanced AC performance across temperature (−55°C to +125°C) and supply voltage (2V–5.5V). Input thresholds scale with VCC (VIH = 0.7VCC, VIL = 0.3VCC), ensuring reliable operation across mixed-voltage domains.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.0 V to 5.5 V - enables interoperability between 3.3 V and 5 V logic domains
tPD (Typ.)	5.3 ns at VCC = 5 V, CL = 15 pF - ensures minimal bus latency in high-speed memory interfaces
IOL / IOH	±8 mA min - provides sufficient drive strength for fan-out to multiple CMOS loads
VIH / VIL	0.7VCC / 0.3VCC - guarantees rail-scaled switching thresholds for stable noise margin
Input Voltage Range	−0.5 V to +7.0 V - allows safe hot-plug and level-shifting without external clamping
ESD Immunity	2 kV HBM - protects against handling damage during board assembly and test
ICC (Max)	4 µA at TA = 25°C - minimizes quiescent power in battery-backed or standby systems

Pinout & Package

TSSOP-48 package: 48-pin thin shrink small outline package with 0.5 mm pitch, body width 6.1 mm, and lead length 0.5–0.75 mm - optimized for high-density PCB layouts and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1, 24, 25, 48	nG (Output Enable)	Active-low control per 4-bit group; enables/disables respective Y outputs
2–3, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23, 26–27, 29–30, 32–33, 35–36, 37–38, 40–41, 43–44, 46–47	Yn (Inverted Output)	16 buffered, inverted outputs - each mirrors corresponding A input with polarity inversion
43–44, 46–47, 37–38, 40–41, 32–33, 35–36, 26–27, 29–30, 19–20, 22–23, 13–14, 16–17, 8–9, 11–12, 2–3, 5–6	An (Data Input)	16 non-inverting inputs feeding respective inverted output stages
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight ground terminals - reduce ground bounce and improve signal integrity in high-speed switching
7, 18, 31, 42	VCC	Four power supply pins - lower impedance path and reduced supply noise under dynamic load

Key Features

Feature	Design Value
Inverted 3-State Buffer Logic	Provides polarity-corrected, direction-controlled data routing for address/data buses with tristate isolation
Overvoltage-Tolerant Inputs/Outputs	Accepts −0.5 V to +7.0 V regardless of VCC - eliminates need for external level-shifters or clamps
Symmetrical Output Drive	\|IOH\| = IOL ≥ 8 mA - ensures matched rise/fall times and reduces timing skew in parallel bus paths
High Noise Immunity	VNIH = VNIL ≥ 28% VCC - maintains logic integrity in electrically noisy industrial or automotive environments
Low Dynamic Noise	VOLP ≤ 0.9 V at VCC = 5 V, CL = 50 pF - suppresses ground bounce and crosstalk in dense digital systems

Applications

Memory Address Buffering

Industrial PLC Backplane Interface

Use Scenario: Driving 16-bit address lines from microcontroller to SRAM or EPROM in embedded control systems.

IC Role / Device Role / Timing Role: Inverted 3-state buffer providing level translation, fan-out expansion, and bus contention control.

Use Value: Enables clean address latching with 5.3 ns delay and prevents bus conflicts during DMA cycles via independent nG control.

Use Scenario: Interfacing mixed-voltage modules (5 V CPU, 3.3 V I/O) on a programmable logic controller backplane.

IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant bus isolator with hot-swap-safe inputs.

Use Value: Eliminates external level shifters while maintaining 2 kV ESD protection and −55°C to +125°C operational range.

Automotive Instrument Cluster Bus

Legacy ISA Bus Signal Conditioning

Use Scenario: Routing display controller signals to segmented LCD drivers in automotive dashboards.

IC Role / Device Role / Timing Role: Inverting buffer with power-down protection for safe sleep/wake transitions.

Use Value: Supports 0–7 V input tolerance during battery transients and meets AEC-Q100 stress requirements via C2MOS process.

Use Scenario: Replacing obsolete 74LS640 in retro-computing hardware upgrades requiring CMOS compatibility.

IC Role / Device Role / Timing Role: Drop-in 16-bit inverted transceiver with improved speed and lower power than bipolar equivalents.

Use Value: Reduces system ICC by >99% versus LS logic while maintaining pin-compatible layout and truth table behavior.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit inverted bus buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVCH16240A	Lower VCC range (1.65–3.6 V), higher drive (±24 mA), no 7 V input tolerance	Optimized for 3.3 V-only systems; lacks 5 V interface capability	Select when operating exclusively at 3.3 V and requiring higher fan-out or lower propagation delay (3.1 ns)
74ALVC16240	Wider VCC (1.65–3.6 V), faster tPD (2.6 ns), no overvoltage input support	Targeted at ultra-high-speed low-voltage FPGA/CPU interconnects	Choose for sub-3 V designs where 7 V input tolerance and 5 V compatibility are unnecessary

Compared with SN74LVCH16240A and 74ALVC16240, the 74VHC16240TTR uniquely supports dual-supply domain bridging (2–5.5 V), 0–7 V input tolerance, and industrial temperature range - making it irreplaceable in legacy upgrade and mixed-voltage infrastructure applications.

Availability

74VHC16240TTR is available at Aetrix Electronics and suitable for memory subsystem design, industrial backplane interfacing, automotive instrument cluster signal routing, and legacy ISA bus modernization requiring stable component supply and long-term obsolescence mitigation.

Supply support for 74VHC16240TTR 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, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.

The 74VHC series targets high-speed, low-power CMOS logic replacement for legacy TTL and earlier HC families - emphasizing robustness, wide supply range, and compatibility with mixed-voltage system architectures.

FAQ

Is the 74VHC16240TTR pin-compatible with the 74VHC16244?

No. The 74VHC16240TTR is an inverted 16-bit buffer (Y = NOT A), while the 74VHC16244 is non-inverting. Their pinouts differ: 74VHC16240 has four separate nG inputs (pins 1, 24, 25, 48), whereas 74VHC16244 uses two nG inputs (pins 1 and 24) controlling eight outputs each. Direct substitution will invert logic states and cause functional failure.

Can the 74VHC16240TTR safely interface a 5 V microcontroller with a 3.3 V FPGA?

Yes. Its inputs tolerate 0–7 V regardless of VCC, and its outputs swing rail-to-rail (0 V to VCC). When powered at 3.3 V, it accepts 5 V inputs without damage and drives 3.3 V–compatible logic levels. No external resistors or translators are needed - verified per absolute maximum ratings and recommended operating conditions.

What is the maximum number of outputs that can switch simultaneously without violating VOLP?

Per the datasheet's dynamic switching characteristics, VOLP = 0.9 V (max) is guaranteed with up to 15 outputs switching simultaneously at f = 1 MHz, CL = 50 pF, and VCC = 5 V. This reflects worst-case simultaneous switching noise (SSN) under defined test conditions - exceeding this count may increase ground bounce beyond specification.

Does the 74VHC16240TTR support hot insertion in live backplanes?

Yes. Its power-down protection ensures inputs and outputs remain high-impedance and non-damaging during VCC ramp-up/down. With 0–7 V input tolerance and clamped I/O structures, it withstands live insertion into powered backplanes - confirmed by absolute maximum ratings (VI = −0.5 V to +7.0 V) and overvoltage immunity testing in STMicroelectronics' qualification reports.

74VHC16240TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VHC

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 4

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:: 48-TSSOP

74VHC16240TTR FAQ

1.How can I place an order for 74VHC16240TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHC16240TTR 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 74VHC16240TTR reliable?

The price and inventory of 74VHC16240TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC16240TTR is usually 5 days.

3.What payment methods are accepted for 74VHC16240TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC16240TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHC16240TTR?

74VHC16240TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHC16240TTR 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 74VHC16240TTR?

For technical support, including 74VHC16240TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC16240TTR requirements.

6.How does Aetrix verify that 74VHC16240TTR is sourced from the original manufacturer or authorized distributors?

All 74VHC16240TTR 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 74VHC16240TTR meets industry standards.

7.What is the process for return or replacement of 74VHC16240TTR?

All 74VHC16240TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC16240TTR, 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 74VHC16240TTR part is unused and in its original packaging.

Return procedure for 74VHC16240TTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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