Texas Instruments SN74LVTH541DW

Overview

SN74LVTH541DW from Texas Instruments is an octal buffer/driver IC designed for 3.3-V V_CC operation with mixed-mode 5-V input/output tolerance, supporting bus line driving and memory address buffering in industrial and embedded systems. It features dual active-low 3-state enable inputs (OE1/OE2), bus-hold on all eight data inputs, and I_off protection for hot insertion. Typical propagation delay is 2.4 ns at V_CC = 3.3 V.

For engineers reviewing the SN74LVTH541DW datasheet, SN74LVTH541DW pinout, SN74LVTH541DW application, or SN74LVTH541DW equivalent, this page delivers verified electrical specs, SOIC-20 package layout, bus-hold implementation details, thermal resistance (θ_JA = 58°C/W), and validated alternatives for 3.3-V/5-V interface bridging in backplane and memory subsystem designs.

Technical Context

The SN74LVTH541DW implements TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2 V) while operating from a 2.7–3.6-V supply, enabling direct interfacing between 3.3-V logic domains and legacy 5-V buses. Its dual AND-gated 3-state control (OE1 ∧ OE2) ensures deterministic high-impedance output behavior during power sequencing.

Bus-hold circuitry provides ±75 µA dynamic hold current at V_CC = 3 V, eliminating external pull resistors on undriven inputs. I_off limits current to ±100 µA when V_CC = 0 V, preventing backflow during hot insertion-verified per JESD 78 Class II latch-up (>500 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM).

Key Specifications

Pinout & Package

SN74LVTH541DW uses a 20-pin SOIC (DW) package measuring 7.5 mm × 12.83 mm × 2.65 mm (JEDEC MS-013), with gull-wing leads and 1.27-mm pitch. Pin 1 index area located at top-left corner of top view.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer applications.

Compared with SN74LVTH541DW, SN74LVC541APW lacks 5-V tolerance and bus-hold but offers wider V_CC range; 74ALVC541MTCX improves speed by 25% but removes I_off and requires PCB redesign due to non-pin-compatible TSSOP layout.

Availability

SN74LVTH541DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address buffering, and hot-swappable I/O modules requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for SN74LVTH541DW 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in logic and interface solutions.

The SN74LVTH541DW belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system interfacing-bridging 3.3-V logic domains with legacy 5-V infrastructure in industrial automation and test equipment.

FAQ

What is the maximum output sink current specification for SN74LVTH541DW?

The SN74LVTH541DW is rated for 64 mA per output in the low state (I_OL) at V_CC = 3 V, meeting standard TTL fanout requirements. This value is guaranteed across the full operating temperature range (−40°C to 85°C) and supports driving up to 10 LSTTL loads without derating. The SN74LVTH541DW maintains VOL ≤ 0.55 V under this condition, ensuring adequate noise margin in real-world PCB layouts.

Does SN74LVTH541DW support true 5-V tolerant inputs when powered from 3.3 V?

Yes, SN74LVTH541DW accepts input voltages up to 7 V (absolute max) and operates reliably with 5-V logic signals while V_CC = 3.3 V. Its input structure is explicitly designed for mixed-mode operation, with VIH = 2 V and VIL = 0.8 V thresholds referenced to V_CC, enabling direct connection to 5-V buses without external level-shifting circuitry. This capability is confirmed in the "Support Mixed-Mode Signal Operation" feature statement of the datasheet.

How does the bus-hold function work on SN74LVTH541DW inputs?

The SN74LVTH541DW integrates active bus-hold circuitry on all eight A1–A8 inputs, providing ±75 µA dynamic hold current at V_CC = 3 V to maintain a valid logic state on undriven or floating inputs. This eliminates the need for external pullup/pulldown resistors in systems with intermittent signal sources. The SN74LVTH541DW bus-hold is disabled when V_CC < 1.5 V during power-down, ensuring predictable high-impedance behavior.

Can SN74LVTH541DW be used in hot-insertion applications?

Yes, SN74LVTH541DW is fully specified for hot-insertion use via two complementary mechanisms: I_off circuitry limits current to ±100 µA when V_CC = 0 V, preventing damaging backflow; and power-up 3-state forces outputs into high-impedance during V_CC ramp-up (0–1.5 V), avoiding bus conflicts. These features are validated per JESD 78 latch-up testing (>500 mA) and documented in the "Support Hot Insertion" section of the datasheet.

What is the thermal resistance (θ_JA) of SN74LVTH541DW in its SOIC-20 package?

The SN74LVTH541DW has a junction-to-ambient thermal resistance (θ_JA) of 58°C/W in the SOIC-20 (DW) package, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value enables calculation of maximum allowable power dissipation: at 85°C ambient, the device can dissipate up to 1.9 W before exceeding its 125°C maximum junction temperature. The SN74LVTH541DW's θ_JA is 12°C/W lower than the same-function TSSOP variant, reflecting superior heat spreading in the SOIC body.