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

STMicroelectronics 74VHCT541ATTR

Name: 74VHCT541ATTR
Brand: STMicroelectronics
SKU: 74VHCT541ATTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHCT541ATTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74VHCT541ATTR.pdf

Description:: IC BUF NON-INVERT 5.5V 20TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VHCT541ATTR from STMicroelectronics is an octal non-inverting 3-state bus buffer with TTL-compatible inputs, designed for bidirectional data bus interfacing in 5V systems. It delivers 4.1 ns typical propagation delay, ±8 mA output drive, 4 µA max quiescent current at 25°C, and operates across 4.5–5.5 V supply with input tolerance up to 7 V - used in industrial control backplanes and memory address latching.

For engineers reviewing the 74VHCT541ATTR datasheet, 74VHCT541ATTR pinout, 74VHCT541ATTR application, or 74VHCT541ATTR equivalent, key selection criteria include 3-state enable logic (dual active-high G1/G2), symmetrical output impedance, power-down input/output protection, and compatibility with legacy 74-series layouts and mixed-voltage (5V-to-3V) interfaces.

Technical Context

The device implements dual-input AND-gated 3-state control: both G1 and G2 must be high to place all eight Y outputs in high-impedance mode. Inputs accept 0–7 V regardless of VCC, enabling hot-swap and power-down safety.

Its C2MOS sub-micron silicon gate process ensures latch-up immunity >200 mA and 2 kV HBM ESD protection on all pins. Propagation delays tPLH and tPHL are balanced (≤0.5 ns skew), and dynamic noise parameters VOLP ≤0.9 V and VIHD/VILD are specified at 5.0 V with 50 pF load.

Key Specifications

Parameter	Value and Actual Design Meaning
tPD (typ)	4.1 ns at VCC = 5 V, CL = 15 pF - enables high-speed address/data buffering in 25 MHz+ bus systems
IOH/IOL (min)	±8 mA - drives standard TTL loads without external pull-ups or level shifters
VIL/VIH	0.8 V / 2.0 V - guarantees interoperability with legacy TTL outputs and 3.3 V CMOS inputs
ICC (max)	4 µA at TA = 25°C - supports low-static-power standby modes in battery-backed modules
VCC range	4.5–5.5 V - accommodates noisy 5 V rails while maintaining rail-to-rail input tolerance (0–7 V)
ESD rating	2 kV HBM - meets IEC 61000-4-2 Level 2 for board-level robustness in industrial environments

Pinout & Package

TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, thin profile (1.2 mm height), lead-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	G1, G2	Active-high 3-state enable inputs - both must be HIGH to disable all outputs
2–9	A1–A8	Non-inverting data inputs - tolerate 0–7 V independent of VCC for hot-swap safety
11–18	Y1–Y8	Buffered non-inverting outputs - symmetrical ±8 mA drive, high-impedance when G1/G2 = HIGH
10	GND	Ground reference - decoupling required within 5 mm of VCC pin for noise control
20	VCC	Positive supply - must be stabilized with 100 nF ceramic capacitor adjacent to pin

Key Features

Feature	Design Value
Power-down protection	All inputs/outputs withstand 0–7 V with VCC = 0 V - eliminates need for external clamps in powered-off subsystems
Input voltage tolerance	VI = −0.5 V to +7.0 V - enables direct interfacing between 5 V logic and 3 V microcontrollers without level shifters
Balanced propagation delay	\|tPLH − tPHL\| ≤ 0.5 ns - minimizes skew in parallel data paths for synchronous bus timing
Low dynamic noise	VOLP ≤ 0.9 V (CL = 50 pF) - reduces ground bounce in dense PCB layouts with multiple switching outputs

Applications

Industrial PLC Backplane

Memory Address Latching

Use Scenario: Isolating CPU address bus from multiple peripheral slots in modular control cabinets.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer enabling time-multiplexed address routing with <4.5 ns delay budget.

Use Value: Dual enable inputs allow per-slot activation; 7 V input tolerance prevents latch-up during hot-insertion of field modules.

Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or EPROM chips on a shared bus.

IC Role / Device Role / Timing Role: Bus driver providing ±8 mA drive strength and matched tPLH/tPHL for setup/hold compliance.

Use Value: 4.1 ns typical tPD ensures full 25 MHz bus operation; low ICC supports sleep-mode retention.

Legacy System Emulation

Mixed-Voltage Interface

Use Scenario: Replacing obsolete 74LS541 in retro-computing hardware restoration projects.

IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in upgrade delivering CMOS power efficiency with TTL input thresholds.

Use Value: Eliminates heat sink requirements; maintains identical PCB footprint and signal timing margins.

Use Scenario: Interfacing a 3.3 V FPGA I/O bank to legacy 5 V peripheral ICs (e.g., DACs, ADCs).

IC Role / Device Role / Timing Role: Level-shifting buffer using TTL-compatible inputs to accept 3.3 V logic highs as valid VIH.

Use Value: No external resistors or translators needed; 0.8 V VIL accepts degraded 3.3 V logic lows safely.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT541PW	Same logic function, 20-pin TSSOP, but TI's version specifies tPD = 5.5 ns (max) vs. ST's 6.0 ns (max) at 15 pF	Identical pinout and DC specs; slightly higher AC test condition margin at temperature extremes	Preferred where TI's qualification documentation (AEC-Q100 Grade 1) is mandated
74VHC541FT	Lower VCC range (2–5.5 V), no TTL input thresholds - requires ≥3.5 V VIH for reliable operation	Not suitable for direct TTL interface; usable only in pure CMOS 3.3 V systems	Select only when interfacing exclusively with 3.3 V CMOS and lower supply headroom is critical

Compared with SN74HCT541PW and 74VHC541FT, the 74VHCT541ATTR uniquely combines guaranteed TTL input compatibility, 7 V input tolerance, and 4.1 ns typical speed - making it optimal for industrial backplanes requiring hot-swap resilience and legacy interoperability.

Availability

74VHCT541ATTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory address latching, legacy system emulation, and mixed-voltage interface designs requiring stable component supply across extended temperature ranges (−55°C to +125°C).

Supply support for 74VHCT541ATTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The VHCT logic family targets high-speed, low-power 5 V TTL-compatible applications - specifically engineered to replace legacy 74LS devices while reducing power consumption and improving noise immunity.

FAQ

Can 74VHCT541ATTR operate with VCC = 3.3 V?

No. The 74VHCT541ATTR is specified only for 4.5–5.5 V operation. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and internal C2MOS structure require nominal 5 V supply for guaranteed logic levels and timing performance. Operation below 4.5 V may cause undefined outputs or excessive propagation delay.

What happens if G1 and G2 are left unconnected?

Leaving G1 or G2 floating risks unintended output enable due to noise coupling. Both inputs have internal pull-downs (~100 kΩ), but STMicroelectronics explicitly recommends tying unused enables to GND via 10 kΩ resistors. Floating enables can cause partial or intermittent 3-state behavior, leading to bus contention or increased ICC.

Is the 74VHCT541ATTR pin-compatible with 74LS541?

Yes - the 74VHCT541ATTR shares identical pinout, logic function, and DC electrical interface with the 74LS541. It provides direct replacement capability with improved parameters: 4 µA vs. 25 mA ICC, 4.1 ns vs. 15 ns tPD, and enhanced ESD/latch-up immunity - requiring no PCB changes.

Does this device support hot-swap insertion into a live backplane?

Yes - its inputs and outputs tolerate 0–7 V regardless of VCC state, and power-down protection prevents current backflow when VCC = 0 V. This allows safe insertion into powered-backplane systems, provided that G1/G2 are held LOW during insertion and slew rate of supply ramp is controlled to avoid transient overstress.

74VHCT541ATTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VHCT

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

74VHCT541ATTR FAQ

1.How can I place an order for 74VHCT541ATTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHCT541ATTR 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 74VHCT541ATTR reliable?

The price and inventory of 74VHCT541ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT541ATTR is usually 5 days.

3.What payment methods are accepted for 74VHCT541ATTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT541ATTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHCT541ATTR?

74VHCT541ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHCT541ATTR 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 74VHCT541ATTR?

For technical support, including 74VHCT541ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT541ATTR requirements.

6.How does Aetrix verify that 74VHCT541ATTR is sourced from the original manufacturer or authorized distributors?

All 74VHCT541ATTR 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 74VHCT541ATTR meets industry standards.

7.What is the process for return or replacement of 74VHCT541ATTR?

All 74VHCT541ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT541ATTR, 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 74VHCT541ATTR part is unused and in its original packaging.

Return procedure for 74VHCT541ATTR:

1.Submit a request within 90 days.

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

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