Texas Instruments SN74ALVC125DGVR

Overview

SN74ALVC125DGVR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65 V to 3.6 V V_CC operation. It provides four independent non-inverting buffers, each with dedicated output-enable (OE) control, ±24-mA drive capability at 3.3 V, 2.8 ns max propagation delay, and latch-up performance exceeding 250 mA per JESD 17 - used in voltage-level-translating data buses in low-voltage embedded controllers and FPGA I/O expansion.

For engineers reviewing the SN74ALVC125DGVR datasheet, SN74ALVC125DGVR pinout, SN74ALVC125DGVR application, or SN74ALVC125DGVR equivalent, key selection criteria include 14-pin TVSOP package compatibility, 3.3-V logic interface timing margins, 3-state bus contention management, and industrial-temperature (–40°C to 85°C) supply stability under dynamic load switching.

Technical Context

This device implements four identical CMOS buffer stages, each with active-low 3-state control logic: output Y goes high-impedance when OE is high, and follows A when OE is low. All inputs and outputs are 3.6-V tolerant regardless of V_CC, enabling mixed-voltage system interfacing between 1.8-V, 2.5-V, and 3.3-V domains.

It features rail-to-rail input thresholds defined as V_IL = 0.35×V_CC (at 1.65–1.95 V), 0.7 V (at 2.3–2.7 V), or 0.8 V (at 2.7–3.6 V); V_IH = 0.65×V_CC, 1.7 V, or 2 V respectively - ensuring robust noise immunity across its full 1.65–3.6-V operating range.

Key Specifications

Pinout & Package

SN74ALVC125DGVR uses a 14-pin Thin Very Small Outline Package (TVSOP, DGV), 3.6 mm × 3.0 mm body, 0.5-mm lead pitch, 1.2-mm max height, JEDEC MO-194 compliant, with pin 1 located in quadrant Q1 of tape-and-reel packaging.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125APWR and 74ALVC125MTCX, SN74ALVC125DGVR offers the lowest thermal resistance among TVSOP-packaged variants and the tightest published t_pd specification - making it optimal for thermally constrained, high-speed bus isolation where layout reuse of DGV footprint is required.

Availability

SN74ALVC125DGVR is available at Aetrix Electronics and suitable for industrial automation, FPGA interface design, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ALVC125DGVR 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 logic solutions, with decades of experience in high-reliability industrial and automotive IC design.

The SN74ALVC125DGVR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered specifically for low-voltage, high-speed bus interface applications in space-constrained, thermally demanding systems.

FAQ

What is the recommended power-up sequence for SN74ALVC125DGVR?

TI recommends tying all OE inputs to V_CC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp-up. This prevents bus contention before the controlling MCU initializes. The SN74ALVC125DGVR itself has no strict sequencing requirement between V_CC and input signals due to its 3.6-V tolerant inputs, but OE control should be asserted before enabling downstream loads. Always verify timing with actual board parasitics using the SN74ALVC125DGVR's published enable/disable times (t_en = 3.5 ns max, t_dis = 4 ns max at 3.3 V).

Does SN74ALVC125DGVR support partial power-down operation?

Yes, SN74ALVC125DGVR supports partial power-down via its IOFF feature: when V_CC = 0 V, all outputs automatically enter high-impedance state regardless of OE or input levels, preventing back-driving of powered circuitry. This is critical for hot-swap applications like modular I/O cards. Inputs remain high-impedance and non-latching during V_CC ramp-down, and the device resumes normal operation within nanoseconds after V_CC stabilizes - confirmed by TI's SCES110H datasheet section "Live Insertion".

Can SN74ALVC125DGVR be used for level translation between 1.8-V and 3.3-V logic domains?

Yes, SN74ALVC125DGVR is explicitly designed for bidirectional level translation. Its inputs are 3.6-V tolerant and operate correctly with V_CC = 1.8 V while accepting 3.3-V input signals; outputs swing rail-to-rail (0 V to 1.8 V) under that condition. When V_CC = 3.3 V, it drives 3.3-V logic levels while accepting 1.8-V inputs. No external resistors or direction-control signals are needed - the SN74ALVC125DGVR achieves this inherently via its wide V_CC range and input voltage tolerance, as verified in TI's "Voltage-Level Translation" application report SCYA037.

What is the maximum capacitive load SN74ALVC125DGVR can drive reliably?

SN74ALVC125DGVR is characterized up to 50 pF load capacitance in its switching specifications (tpd, ten, tdis). At 3.3 V, with CL = 50 pF and f = 10 MHz, typical power dissipation per gate is 19 pF (Cpd), confirming stable operation. Driving >50 pF may increase propagation delay and edge degradation; for 100-pF loads, TI recommends verifying signal integrity with oscilloscope measurements using the SN74ALVC125DGVR's specified output impedance and rise/fall times (tr/tf ≤ 2.5 ns). Layout best practices - short traces, ground return paths, and local decoupling - are essential for maintaining timing margins.

How does SN74ALVC125DGVR differ from standard 74LVC125 devices?

SN74ALVC125DGVR belongs to TI's Advanced Low-Voltage CMOS (ALVC) family, offering tighter AC specifications than baseline LVC: max tpd is 2.8 ns (vs. 3.7 ns for SN74LVC125), and output drive is guaranteed ±24 mA across the full 1.65–3.6-V range (LVC typically specifies ±24 mA only at V_CC ≥ 2.7 V). ALVC also features improved noise immunity and stricter ESD ratings (2000-V HBM vs. 1500-V for many LVC variants). These enhancements make SN74ALVC125DGVR preferable for high-speed, noise-sensitive, or thermally constrained applications where timing margin and robustness are critical.