Texas Instruments SN74LV1T126DBVR

Overview

SN74LV1T126DBVR from Texas Instruments is a single-supply, 3-state CMOS buffer gate optimized for bidirectional logic-level translation across 1.8 V to 5.5 V domains. It supports up-translation (e.g., 1.8 V → 3.3 V at 3.3 V V_CC) and down-translation (e.g., 5.0 V → 3.3 V at 3.3 V V_CC), delivers 8 mA output drive at 5 V, and operates from –40°C to 125°C - enabling use in portable power management and mixed-voltage I/O interfacing.

For engineers reviewing the SN74LV1T126DBVR datasheet, SN74LV1T126DBVR pinout, SN74LV1T126DBVR application, or SN74LV1T126DBVR equivalent, key selection criteria include verified 5 V–tolerant inputs, 3-state enable control, SOT-23-5 package compatibility, and confirmed 50 MHz operation at 3.3 V V_CC with 15 pF load.

Technical Context

The SN74LV1T126DBVR implements an LVxT-family enhanced input threshold architecture: VIH(MIN) as low as 0.95 V at 1.8 V V_CC enables reliable up-translation from sub-2 V sources, while 5 V–tolerant inputs support down-translation without external resistors. Its output voltage is strictly referenced to V_CC, ensuring consistent logic levels across supply voltages.

It features balanced CMOS push-pull outputs with programmable 3-state control via active-high OE, enabling bus isolation in multi-device systems. The device meets JESD17 latch-up immunity (>250 mA), supports standard logic pinouts, and exhibits characterized switching performance up to 50 MHz at 3.3 V with 15 pF load.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 2.80 mm footprint, 2.9 mm × 1.6 mm body size, 1.45 mm height, lead-free NiPdAu or Sn finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar logic-level translation applications.

Compared with SN74LV1T125DBVR and TXS0102DCUR, the SN74LV1T126DBVR uniquely provides non-inverting 3-state buffering with 5 V–tolerant inputs in SOT-23-5 - making it optimal for unidirectional enable/control lines where signal polarity and bus isolation are critical.

Availability

SN74LV1T126DBVR is available at Aetrix Electronics and suitable for portable electronics, industrial sensor nodes, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for SN74LV1T126DBVR 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 expertise in high-reliability industrial and automotive-grade components.

The SN74LV1T126DBVR belongs to TI's LVxT family of single-gate logic devices engineered specifically for voltage-domain bridging in space-constrained, mixed-supply systems - targeting portable, telecom, and automotive applications demanding minimal footprint and robust level translation.

FAQ

What is the maximum operating frequency of the SN74LV1T126DBVR?

The SN74LV1T126DBVR is characterized up to 50 MHz at 3.3 V V_CC with a 15 pF load, as specified in the switching characteristics table. At 5.0 V V_CC, propagation delay improves to 2.7 ns typical, supporting reliable operation at this frequency. Performance degrades at lower V_CC: 10.5 ns typical at 1.8 V V_CC limits usable bandwidth to ~15 MHz in low-voltage configurations. Always verify timing margins against actual load and trace capacitance in final layout.

Can the SN74LV1T126DBVR translate 5 V signals to 1.8 V logic levels?

Yes, the SN74LV1T126DBVR supports down-translation from 5 V to 1.8 V when powered from 1.8 V V_CC. Its 5 V–tolerant inputs accept 5 V signals directly, and the output swings from 0 V to ~1.8 V (VOH ≥ V_CC – 0.1 V). This is explicitly validated in the datasheet's down-translation combinations table and electrical characteristics (e.g., VOH min = 1.28 V at 1.8 V V_CC, I_OH = –2 mA). Ensure input VIH remains above 0.95 V and VIL below 0.57 V for reliable detection.

Is the SN74LV1T126DBVR pin-compatible with other LV1T-series devices?

Yes, the SN74LV1T126DBVR shares identical SOT-23-5 (DBV) pinout and function mapping with all LV1T-series 5-pin variants including SN74LV1T00, SN74LV1T04, SN74LV1T125, and SN74LV1T34. Pin 1 is OE (or unused input for non-3-state variants), Pin 2 is input A, Pin 3 is GND, Pin 4 is output Y (or Y̅ for inverting types), and Pin 5 is V_CC. This enables drop-in replacement within the same package footprint when functional requirements align.

Does the SN74LV1T126DBVR require external pull-up or pull-down resistors on unused pins?

Yes - the OE pin must never be left floating, as stated in the functional modes section: "Not recommend to float OE pin for signal oscillation." Unused inputs must be terminated to V_CC or GND per TI's SCBA004 application report. A 10 kΩ resistor is recommended for weak biasing. The SN74LV1T126DBVR has no internal pull-ups; floating OE causes undefined output states and potential shoot-through current, risking device instability or excessive power draw.

What is the thermal resistance (RθJA) of the SN74LV1T126DBVR in its SOT-23-5 package?

The SN74LV1T126DBVR in the DBV (SOT-23-5) package has a junction-to-ambient thermal resistance (RθJA) of 278°C/W, as updated in the February 2024 revision of the datasheet. This value assumes standard JEDEC test conditions (1s2s board). For continuous operation at 8 mA output drive and 5.5 V V_CC, junction temperature rise remains within safe limits (<30°C) at ambient ≤100°C - confirming suitability for thermally constrained portable and industrial enclosures without forced airflow.