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

STMicroelectronics 74ACT16541TTR

Name: 74ACT16541TTR
Brand: STMicroelectronics
SKU: 74ACT16541TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ACT16541TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74ACT16541TTR.pdf

Description:: IC BUFF NON-INVERT 5.5V 48TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74ACT16541TTR from STMicroelectronics is a 16-bit non-inverting bus buffer with dual 3-state output-enable control, designed for high-speed TTL/CMOS interface bridging in data bus systems. It delivers 4.8 ns typical propagation delay at 5 V, ±24 mA symmetrical drive capability, and operates across 4.5–5.5 V with 8 µA max quiescent ICC at 25°C. Used in backplane transceivers and memory I/O expansion.

For engineers reviewing the 74ACT16541TTR datasheet, 74ACT16541TTR pinout, 74ACT16541TTR application, or 74ACT16541TTR equivalent, key selection criteria include dual-section 3-state enable logic (nG1/nG2 AND-gated), 50 Ω transmission line driving compliance, ESD immunity (2 kV HBM), and TSSOP-48 package thermal and routing constraints.

Technical Context

The device integrates two independent 8-bit buffer sections, each with separate nG1/nG2 enable inputs configured as a 2-input AND gate: outputs enter high-impedance state if either enable is high. Input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) ensure direct TTL compatibility without level-shifting.

Output stages provide matched |IOH| = |IOL| = 24 mA (min) into 50 Ω loads, enabling clean signal integrity on controlled-impedance PCB traces. Built-in ESD protection (2 kV HBM) and latch-up immunity support industrial-grade reliability in noisy bus environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	4.8 ns typical at VCC = 5 V - enables >200 MHz bus clocking with margin
Supply Voltage Range	4.5 V to 5.5 V - supports standard 5 V rail with ±10% tolerance
Output Drive	±24 mA min (symmetrical) - drives 50 Ω transmission lines without external termination
Quiescent ICC	8 µA max at TA = 25°C - ultra-low static power for always-on bus interfaces
Input Thresholds	VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees interoperability with legacy TTL logic families
ESD Immunity	2 kV HBM - protects against handling-induced discharge during board assembly
Operating Temperature	−55°C to +125°C - qualified for extended industrial and automotive under-hood use

Pinout & Package

TSSOP-48 package: 48-pin thin shrink small outline package, 12.6 mm × 8.1 mm body, 0.5 mm pitch, 1.2 mm max height, lead-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 48	1G1, 1G2	AND-gated 3-state enable inputs for first 8-bit section - both must be low for active drive
2–3, 5–6, 8–9, 11–12	1Y1–1Y8	Non-inverting buffered outputs for first 8-bit data path
13–14, 16–17, 19–20, 22–23	2Y1–2Y8	Non-inverting buffered outputs for second 8-bit data path
24, 25	2G1, 2G2	AND-gated 3-state enable inputs for second 8-bit section
26–27, 29–30, 32–33, 35–36	2A1–2A8	Inputs to second 8-bit buffer section
37–38, 40–41, 43–44, 46–47	1A1–1A8	Inputs to first 8-bit buffer section
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight dedicated ground pins - reduce ground bounce and improve noise immunity
7, 18, 31, 42	VCC	Four dedicated VCC pins - lower supply impedance and stabilize switching margins

Key Features

Feature	Design Value
Dual independent 8-bit sections	Enables selective gating of two data lanes (e.g., address vs. data bus) using separate enable pairs
50 Ω transmission line drive	Eliminates need for external series termination resistors on PCB traces up to 15 cm
Symmetrical output impedance	Ensures matched rise/fall times (<10% skew) for clean NRZ signaling in parallel buses
2 kV HBM ESD protection	Reduces risk of field failure during handling, rework, or system-level ESD events
Sub-micron C2MOS process	Delivers high speed with low dynamic power (CPD = 25 pF) and improved latch-up immunity

Applications

Memory Expansion Interface

Industrial Backplane Bus

Use Scenario: Adding SRAM or Flash memory modules to microcontroller-based PLCs with limited native bus width.

IC Role / Device Role / Timing Role: Bidirectional 16-bit data bus buffer with independent gating per byte lane to isolate memory access cycles.

Use Value: Enables zero-wait-state memory reads/writes at 5 V with 4.8 ns delay, preserving timing margins in deterministic real-time firmware.

Use Scenario: Interconnecting multiple CPU and I/O cards across a 16-bit VME-like backplane operating at 25 MHz.

IC Role / Device Role / Timing Role: High-drive bus repeater that maintains signal integrity over 15 cm 50 Ω traces between slots.

Use Value: Eliminates external termination and reduces inter-slot skew to <1 ns, supporting synchronous multi-card arbitration.

Automotive ECU Data Hub

Legacy System Emulation

Use Scenario: Aggregating sensor data from CAN, LIN, and analog front-ends into a central MCU in engine control units.

IC Role / Device Role / Timing Role: Level-translating bus buffer interfacing 5 V TTL peripherals with 5 V CMOS host processor I/O.

Use Value: Guaranteed VIH/VIL compatibility ensures reliable sampling across −40°C to +125°C ambient without voltage translation ICs.

Use Scenario: Replacing obsolete 74F or 74AS logic in retro computing hardware restoration projects.

IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for 74ACT16541 in vintage workstation motherboard designs.

Use Value: Matches original AC performance (4.8 ns tPD) while adding modern ESD robustness and lower ICC leakage.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT16541DGGR	Same logic function and AC specs; 48-pin TSSOP but TI's package has 0.5 mm pitch and 12.5 × 6.1 mm footprint	Requires PCB land pattern revision due to different E1 (6.1 mm vs. 6.2 mm) and D (12.5 mm vs. 12.6 mm)	Preferred for new TI-centric designs where sourcing continuity with TI's long-term product roadmap is prioritized
74LVC16244APAG	3.3 V only (1.65–3.6 V), lower drive (±24 mA @ 3.3 V), no 5 V tolerance - not pin-compatible	Requires level shifters when interfacing with 5 V TTL; unsuitable for direct 5 V bus replacement	Only viable in all-3.3 V systems needing lower power; not a functional substitute for 5 V operation

Compared with SN74ACT16541DGGR, the 74ACT16541TTR offers identical electrical behavior but requires verification of mechanical fit; versus 74LVC16244APAG, it provides essential 5 V compatibility and TTL threshold matching absent in LVC family devices.

Availability

74ACT16541TTR is available at Aetrix Electronics and suitable for industrial backplane interfaces, automotive ECU data aggregation, and memory expansion modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ACT16541TTR 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 broad manufacturing and quality infrastructure.

The 74ACT logic family targets high-speed, 5 V mixed-signal interface applications where TTL compatibility, low power, and robust ESD performance are critical - particularly in legacy system upgrades and industrial control.

FAQ

Is the 74ACT16541TTR compatible with 5 V TTL logic inputs and outputs?

Yes. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output voltage levels (VOH ≥ 4.4 V, VOL ≤ 0.5 V at 24 mA) meet standard TTL specifications across the full −55°C to +125°C operating range, enabling direct connection without level shifters.

What is the function of the dual enable inputs (nG1/nG2) on each 8-bit section?

Each pair functions as an AND gate: both nG1 and nG2 must be low for the corresponding 8-bit outputs to drive; if either is high, all eight outputs go to high-impedance state. This allows flexible bus arbitration - e.g., one enable for read, another for write - without external logic.

Can the 74ACT16541TTR drive unterminated 50 Ω transmission lines?

Yes. Its symmetrical ±24 mA output drive and matched output impedance allow clean edge transmission on 50 Ω PCB traces up to 15 cm in length without series termination resistors, reducing BOM count and layout complexity in high-speed parallel buses.

Does this device support hot insertion or live bus swapping?

No. While it features 2 kV HBM ESD protection and high latch-up immunity, it lacks powered-off protection (Ioff) or bus-hold circuitry. Hot insertion requires additional isolation components or system-level sequencing controls to prevent supply contention or back-driving.

74ACT16541TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74ACT

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74ACT16541TTR FAQ

1.How can I place an order for 74ACT16541TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ACT16541TTR 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 74ACT16541TTR reliable?

The price and inventory of 74ACT16541TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16541TTR is usually 5 days.

3.What payment methods are accepted for 74ACT16541TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16541TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ACT16541TTR?

74ACT16541TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ACT16541TTR 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 74ACT16541TTR?

For technical support, including 74ACT16541TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16541TTR requirements.

6.How does Aetrix verify that 74ACT16541TTR is sourced from the original manufacturer or authorized distributors?

All 74ACT16541TTR 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 74ACT16541TTR meets industry standards.

7.What is the process for return or replacement of 74ACT16541TTR?

All 74ACT16541TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16541TTR, 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 74ACT16541TTR part is unused and in its original packaging.

Return procedure for 74ACT16541TTR:

1.Submit a request within 90 days.

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

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