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

STMicroelectronics 74LCX162541TTR

Name: 74LCX162541TTR
Brand: STMicroelectronics
SKU: 74LCX162541TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX162541TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LCX162541TTR.pdf

Description:: IC BUF NON-INVERT 3.6V 48TSSOP

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Product details

Overview

74LCX162541TTR from STMicroelectronics is a 16-bit non-inverting 3-state bus buffer with dual 8-bit sections, 5V-tolerant I/O, 2.0–3.6V operation, 4.4 ns max propagation delay at 3V, and integrated 26Ω series output resistors for noise suppression. It serves as a level-translating bidirectional bus interface in low-voltage memory address/data paths.

For engineers reviewing the 74LCX162541TTR datasheet, 74LCX162541TTR pinout, 74LCX162541TTR application, or 74LCX162541TTR equivalent, key selection criteria include 5V tolerance on all I/O pins, symmetrical ±12 mA drive capability at 3V, latch-up immunity >500 mA, ESD robustness (HBM >2 kV), and TSSOP-48 package compatibility with PCI-bus signaling levels.

Technical Context

This device implements two independent 8-bit non-inverting buffers, each controlled by a dual-input AND-gated 3-state enable (nG1 ∧ nG2). Outputs enter high-impedance state when either enable input is high, enabling precise bus arbitration.

Each output integrates a 26Ω series resistor to dampen transmission-line reflections and reduce dynamic ground bounce and crosstalk in high-speed 3.3V systems interfacing with legacy 5V logic. Input and output protection circuits ensure 2 kV HBM ESD immunity and safe operation across V_I = 0–5.5 V and V_O = 0–5.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.0 V to 3.6 V - supports core logic supply in modern low-power 3.3V systems while retaining 1.5V data retention during standby
t_PD (max)	4.4 ns at V_CC = 3.0 V - enables timing-critical address/data buffering in sub-225 MHz bus cycles
I_OH/I_OL (min)	±12 mA at V_CC = 3.0–3.6 V - delivers PCI-bus-compliant drive strength without external termination
Input/Output Voltage Tolerance	0–5.5 V - allows direct connection to 5V TTL/CMOS signals without level shifters
Output Series Resistance	26 Ω - reduces edge-induced ringing and EMI in FR-4 PCB traces up to 10 cm
Latch-up Immunity	>500 mA per JESD17 - ensures robust operation under transient overvoltage or hot-swap conditions

Pinout & Package

TSSOP-48 (Thin Shrink Small Outline Package), 12.6 mm × 8.1 mm body, 0.5 mm pitch, 1.2 mm height. Pin 1 marked by beveled corner; thermal pad not present.

Pin/Terminal	Circuit Role	Design Meaning
1, 48	1G1, 1G2	AND-gated enable inputs for first 8-bit section - both must be LOW to activate outputs 1Y1–1Y8
2–3, 5–6, 8–9, 11–12	1Y1–1Y8	Non-inverting buffered outputs of first section - each includes 26Ω series resistor
13–14, 16–17, 19–20, 22–23	2Y1–2Y8	Non-inverting buffered outputs of second section - independently enabled via pins 24/25
24, 25	2G1, 2G2	AND-gated enable inputs for second 8-bit section - identical control logic to pins 1/48
26–27, 29–30, 32–33, 35–36	2A1–2A8	Data inputs for second section - accept 0–5.5 V signals regardless of V_CC
37–38, 40–41, 43–44, 46–47	1A1–1A8	Data inputs for first section - fully 5V tolerant with no current limiting required
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight dedicated ground pins - minimize ground bounce across 16-bit switching activity
7, 18, 31, 42	V_CC	Four dedicated power pins - reduce IR drop and improve noise margin in high-frequency operation

Key Features

Feature	Design Value
5V-tolerant I/O	Supports mixed-voltage system integration without external level translators or voltage clamps
Integrated 26Ω output resistors	Eliminates need for discrete series termination resistors on PCB, saving board space and BOM cost
Symmetrical drive strength	±12 mA output current ensures matched rise/fall times and reduced skew in parallel bus routing
Power-down protection	Inputs and outputs remain high-impedance and non-destructive when V_CC = 0 V, enabling hot-plug capability

Applications

Memory Address Buffering

PCI Bus Interface

Use Scenario: Driving 16-bit address lines from a 3.3V microcontroller to multiple 5V SRAM chips in an embedded industrial controller.

IC Role / Device Role / Timing Role: Non-inverting 3-state bus buffer providing level translation, fanout expansion, and timing-controlled bus release.

Use Value: Enables deterministic address setup/hold timing with 4.4 ns propagation delay and eliminates external termination components.

Use Scenario: Interfacing a 3.3V FPGA I/O bank to a legacy 5V PCI slot in a test instrumentation platform.

IC Role / Device Role / Timing Role: Bidirectional 5V-tolerant bus transceiver supporting PCI signal integrity requirements at 33 MHz.

Use Value: Meets PCI bus drive specifications (±12 mA) and noise limits via integrated 26Ω resistors without layout compromises.

Hot-Swappable Backplane Interface

Low-Power Industrial Data Acquisition

Use Scenario: Isolating a 3.3V ADC/DAC module from a 5V backplane bus in modular PLC I/O chassis.

IC Role / Device Role / Timing Role: Fault-isolated bus buffer with power-down protection and latch-up immunity for field-replaceable modules.

Use Value: Prevents backfeeding and damage during live insertion/removal due to zero-current leakage (<10 µA) when V_CC = 0 V.

Use Scenario: Buffering sensor data lines between a 2.5V ultra-low-power MCU and 5V analog front-end ICs in battery-powered monitoring nodes.

IC Role / Device Role / Timing Role: Low-quiescent-current (20 µA) bus driver enabling sleep-mode retention and fast wake-up response.

Use Value: Maintains data integrity across voltage domains while consuming <1 µW static power per channel at 2.7V.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit non-inverting 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC16244ADGGR	Lower drive (±24 mA), no built-in series resistors, 1.65–3.6V V_CC, no 5V tolerance without external clamping	Requires external termination and level-shifting circuitry for 5V bus interfacing	Select when higher drive strength is needed and system-level noise control is handled elsewhere
74ALVC162541PAG	Same pinout, 1.65–3.6V V_CC, 5V-tolerant I/O, but lacks integrated 26Ω resistors and has higher t_PD (5.5 ns)	Needs discrete series resistors for EMI control in high-speed layouts	Select when lower static current (10 µA) is prioritized over built-in noise suppression

Compared with SN74LVC16244ADGGR and 74ALVC162541PAG, the 74LCX162541TTR uniquely combines 5V tolerance, integrated 26Ω termination, and sub-5 ns propagation in a single TSSOP-48 package-reducing component count and layout risk in mixed-voltage bus designs.

Availability

74LCX162541TTR is available at Aetrix Electronics and suitable for memory subsystems, PCI add-in cards, hot-swappable I/O modules, and low-power industrial data acquisition requiring stable component supply and long-term lifecycle support.

Supply support for 74LCX162541TTR 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 strong IP in silicon gate CMOS process technologies.

The 74LCX logic family targets high-speed, low-voltage 3.3V system interfacing with legacy 5V infrastructure-designed specifically for noise-sensitive, space-constrained applications where level translation and signal integrity are critical.

FAQ

Can 74LCX162541TTR operate with V_CC = 2.5V while driving 5V-tolerant loads?

Yes. The device operates across 2.0–3.6V V_CC and maintains full 5V tolerance on all inputs and outputs regardless of supply voltage. At V_CC = 2.5V, output high voltage is guaranteed ≥2.0V (I_OH = –8 mA), sufficient to drive standard 5V TTL inputs with noise margin.

What is the maximum clock frequency supported for burst-mode bus operation?

Based on t_PD = 4.4 ns (max) and t_SK ≤1.0 ns, the device supports reliable 16-bit parallel data transfer up to 180 MHz (5.5 ns cycle time) in systems with matched trace lengths and proper termination. Skew-limited timing margins apply above 100 MHz.

Are the 26Ω series resistors internal to each output driver or external to the die?

The 26Ω resistors are monolithically integrated into each output driver stage using on-die polysilicon elements. They are not bond-wire or package parasitics - confirmed by DC resistance measurement and dynamic noise characterization in the official datasheet Figure 5.

Does the device meet JEDEC JESD78 latch-up Class II requirements?

Yes. The device exceeds 500 mA latch-up immunity per JESD17, which satisfies JEDEC JESD78 Class II (≥200 mA) requirements. This rating was verified under worst-case V_CC = 3.6V, T_A = 125°C conditions with simultaneous I/O stress.

74LCX162541TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LCX

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:: 12mA, 12mA

Voltage - Supply:: 2V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74LCX162541TTR FAQ

1.How can I place an order for 74LCX162541TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX162541TTR 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 74LCX162541TTR reliable?

The price and inventory of 74LCX162541TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX162541TTR is usually 5 days.

3.What payment methods are accepted for 74LCX162541TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX162541TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX162541TTR?

74LCX162541TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX162541TTR 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 74LCX162541TTR?

For technical support, including 74LCX162541TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX162541TTR requirements.

6.How does Aetrix verify that 74LCX162541TTR is sourced from the original manufacturer or authorized distributors?

All 74LCX162541TTR 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 74LCX162541TTR meets industry standards.

7.What is the process for return or replacement of 74LCX162541TTR?

All 74LCX162541TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX162541TTR, 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 74LCX162541TTR part is unused and in its original packaging.

Return procedure for 74LCX162541TTR:

1.Submit a request within 90 days.

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

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