Texas Instruments 1P1G126QDBVRQ1

Overview

1P1G126QDBVRQ1 from Texas Instruments is an automotive-qualified single 3-state bus buffer gate (non-inverting) used for signal isolation and controlled data routing in low-voltage digital systems. It operates from 1.65V to 5.5V VCC, accepts 5.5V-tolerant inputs, delivers ±24mA output drive at 3.3V, and features Ioff for live insertion-enabling use in motor control power sequencing and high-speed SSD interconnects.

For engineers reviewing the 1P1G126QDBVRQ1 datasheet, 1P1G126QDBVRQ1 pinout, 1P1G126QDBVRQ1 application, or 1P1G126QDBVRQ1 equivalent, key selection criteria include 3-state enable timing (tdis ≤ 6 ns), automotive temperature range (–40°C to 125°C), SOT-23-5 package footprint compatibility, and 5.5V input tolerance enabling mixed-voltage interface bridging.

Technical Context

The 1P1G126QDBVRQ1 implements a single non-inverting buffer with active-low 3-state output enable (OE), where Y = A when OE is high and Y = high-impedance when OE is low. Its CMOS input structure supports 5.5V overvoltage tolerance independent of VCC, enabling down-translation from higher-voltage logic domains to lower-VCC buses.

It integrates partial-power-down protection via Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive current and latch-up (exceeding 100mA per JESD78 Class II). The balanced CMOS output stage provides symmetrical sourcing/sinking capability, critical for driving transmission lines and LED loads without skew-induced timing errors.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin package, 2.90mm × 1.60mm body size, surface-mount, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125QDBVRQ1 and NC7SZ126P5X, the 1P1G126QDBVRQ1 uniquely combines non-inverting logic, AEC-Q100 Grade 1 qualification, and 5.5V input tolerance - making it the only drop-in solution for automotive motor control and CMTS interface applications demanding polarity preservation and extended temperature operation.

Availability

1P1G126QDBVRQ1 is available at Aetrix Electronics and suitable for automotive motor control, SSD internal bus isolation, and video infrastructure signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 1P1G126QDBVRQ1 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 company specializing in analog, embedded processing, and connectivity technologies, with leadership in automotive, industrial, and communications markets.

The SN74LVC1G126-Q1 belongs to TI's automotive-qualified LVC logic family, designed specifically for robust, low-power signal buffering in harsh-environment applications including electric vehicle power electronics and next-generation broadband infrastructure.

FAQ

What is the maximum input voltage rating for the 1P1G126QDBVRQ1?

The 1P1G126QDBVRQ1 supports input voltages up to 5.5V regardless of VCC level - a key feature enabling direct interfacing with 5V logic families while operating from lower VCC rails such as 3.3V or 1.8V. This 5.5V tolerance is specified in the Absolute Maximum Ratings table and verified across the full –40°C to 125°C temperature range. Exceeding this limit risks permanent damage per TI's absolute ratings guidance.

Does the 1P1G126QDBVRQ1 support hot-plug operation?

Yes, the 1P1G126QDBVRQ1 supports hot-plug operation via its Ioff feature, which disables all outputs and limits leakage to ±10 μA when VCC = 0V. This prevents back-current flow into powered-down sections of a system - critical for modular SSD enclosures and reconfigurable video infrastructure platforms. The Ioff specification is tested per AEC-Q100 requirements and documented in the Electrical Characteristics table.

What is the propagation delay of the 1P1G126QDBVRQ1 at 3.3V supply?

At VCC = 3.3V ± 0.3V and CL = 50pF, the 1P1G126QDBVRQ1 exhibits a typical propagation delay (tpd) of 1 ns (minimum) to 5.8 ns (maximum) for A-to-Y transitions. These values are measured under standard load conditions defined in TI's SCES467E datasheet Figure 6-1 and apply across the full operating temperature range. Delay variation is minimized by maintaining clean power delivery and controlled trace impedance.

Can the 1P1G126QDBVRQ1 drive an LED directly?

Yes, the 1P1G126QDBVRQ1 can drive an LED directly: its ±24mA output drive at 3.3V exceeds typical LED forward current requirements (10–20mA). When used in this role, connect the LED anode to VCC and cathode to Y (with current-limiting resistor to ground), or reverse for sink configuration. Ensure total output current remains within 50mA per pin and 100mA device limit - confirmed in Section 5.1 Absolute Maximum Ratings.

Is the 1P1G126QDBVRQ1 pin-compatible with other SOT-23-5 logic buffers?

The 1P1G126QDBVRQ1 uses the standard DBV (SOT-23-5) pinout: Pin 1 = OE, Pin 2 = A, Pin 3 = GND, Pin 4 = Y, Pin 5 = VCC. It is pin-compatible with SN74LVC1G125QDBVRQ1 (inverting variant) and SN74LVC1G07QDBVRQ1 (open-drain), but not with non-3-state or differently configured SOT-23-5 logic devices. Always verify pin function mapping against the specific alternative's datasheet before substitution.