Texas Instruments SN74LV1T34QDBVRQ1

Overview

SN74LV1T34QDBVRQ1 from Texas Instruments is an automotive-grade single-channel CMOS buffer logic level shifter supporting bidirectional voltage translation across 1.8 V to 5.5 V supply rails. It performs Y = A buffering with 5.5 V-tolerant inputs, delivers up to 150 Mbps data rate at 5 V VCC, and operates from –40°C to +125°C for engine control and ADAS signal interfacing.

For engineers reviewing the SN74LV1T34QDBVRQ1 datasheet, SN74LV1T34QDBVRQ1 pinout, SN74LV1T34QDBVRQ1 application, or SN74LV1T34QDBVRQ1 equivalent, key selection factors include its AEC-Q100 Grade 1 qualification, LVxT enhanced input threshold architecture, up/down translation capability (e.g., 1.2 V → 1.8 V or 5.0 V → 3.3 V), and SOT-23-5 package compatibility with space-constrained automotive PCBs.

Technical Context

The SN74LV1T34QDBVRQ1 implements a single positive-logic buffer (Y = A) with supply-referenced CMOS outputs and asymmetric input thresholds enabling both up-translation (e.g., 1.8 V input → 3.3 V output) and down-translation (e.g., 5.0 V input → 2.5 V output). Its LVxT input structure supports VIH as low as 0.99 V at 1.8 V VCC and tolerates inputs up to 5.5 V regardless of supply voltage.

It uses balanced push-pull CMOS output drivers capable of ±15 mA at 3.3–5.0 V VCC, exhibits propagation delays from 3.4 ns (5 V, CL = 15 pF) to 12.7 ns (1.8 V, CL = 15 pF), and maintains latch-up immunity exceeding 250 mA per JESD17 - critical for noisy automotive power domains.

Key Specifications

Pinout & Package

SN74LV1T34QDBVRQ1 is packaged in a 5-pin SOT-23 (DBV) case measuring 2.9 mm × 2.8 mm, optimized for automated placement and thermal dissipation in compact automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1T45DBVR and NLSV1T34MUTBG, the SN74LV1T34QDBVRQ1 uniquely combines AEC-Q100 Grade 1 qualification, unidirectional simplicity, and LVxT up/down translation in a single SOT-23-5 footprint - making it optimal for safety-critical, space-constrained automotive signal conditioning where direction control overhead or temperature margin reduction is unacceptable.

Availability

SN74LV1T34QDBVRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera interfaces, body control modules, and infotainment system UART adaptation requiring stable component supply across extended automotive lifecycles.

Supply support for SN74LV1T34QDBVRQ1 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 automotive ICs, with decades of automotive qualification expertise and broad manufacturing scale.

The SN74LV1T34QDBVRQ1 belongs to TI's LVxT family of single-gate logic translators, engineered specifically for voltage-domain bridging in next-generation automotive ECUs, ADAS sensors, and electrified powertrain systems where reliability and mixed-supply interoperability are mandatory.

FAQ

What automotive qualification does the SN74LV1T34QDBVRQ1 meet?

The SN74LV1T34QDBVRQ1 is AEC-Q100 qualified for automotive applications with Grade 1 temperature rating (–40°C to +125°C ambient), HBM ESD classification Level 2 (±4 kV), and CDM ESD classification Level C4B (±2 kV). These certifications confirm its suitability for powertrain, chassis, and ADAS systems where environmental stress and long-term reliability are critical. The SN74LV1T34QDBVRQ1 undergoes rigorous stress testing per JEDEC standards to ensure performance stability over 15+ years of vehicle service life.

Can the SN74LV1T34QDBVRQ1 translate 1.2 V signals to 3.3 V outputs?

Yes, the SN74LV1T34QDBVRQ1 supports 1.2 V to 3.3 V up-translation when powered from a 3.3 V supply. Its LVxT-enhanced input structure provides a VIH(MIN) of 1.45 V at 3.3 V VCC, which is compatible with 1.2 V CMOS logic high levels when combined with appropriate noise margin considerations. This capability is explicitly documented in TI's datasheet Section 7.3.3.2 and enables direct interfacing between ultra-low-power sensors and standard 3.3 V microcontrollers without external level-shifting circuitry. The SN74LV1T34QDBVRQ1 achieves this using internally optimized input threshold circuitry, not external biasing.

What is the maximum capacitive load the SN74LV1T34QDBVRQ1 can drive while maintaining specified timing?

The SN74LV1T34QDBVRQ1 is characterized to drive loads up to 50 pF while meeting all switching specifications across temperature and voltage ranges. At 3.3 V VCC and 25°C, propagation delay remains ≤7.3 ns (CL = 15 pF) and ≤8.8 ns (CL = 50 pF); at 125°C, it degrades to ≤10.4 ns and ≤12.7 ns respectively. Exceeding 50 pF increases delay and may cause signal integrity issues like ringing or undershoot. For heavier loads, TI recommends verifying timing margins in the target application or adding a buffer stage. The SN74LV1T34QDBVRQ1's output driver strength and layout guidelines (e.g., short traces, ground flood) are designed around this 50 pF limit.

Does the SN74LV1T34QDBVRQ1 require external pull-up or pull-down resistors on its input pin?

Yes - the SN74LV1T34QDBVRQ1 input (pin 2, A) must never be left floating. Unused inputs must be terminated to a valid logic level: either VCC (for default HIGH) or GND (for default LOW). A 10 kΩ resistor is recommended per TI's application guidance, balancing leakage current (≤1 µA), transition speed requirements (≥20 ns/V), and noise immunity. Direct connection to VCC or GND is acceptable if the input is permanently unused. Failure to terminate the input risks oscillation, excessive ICC, and unreliable logic states - especially in automotive environments with EMI. The SN74LV1T34QDBVRQ1's internal structure lacks built-in biasing, so external termination is mandatory for robust operation.

How does the SN74LV1T34QDBVRQ1 handle 5 V inputs while operating from a 1.8 V supply?

The SN74LV1T34QDBVRQ1 supports 5 V-tolerant inputs independent of VCC, enabling down-translation from 5 V sources to 1.8 V logic levels when powered from 1.8 V. Its input protection structure includes clamp diodes that safely shunt excess voltage to VCC or GND, and the LVxT input threshold design ensures correct recognition of 5 V HIGH signals even at low VCC. Per datasheet Table 7-1 and Section 7.3.3.1, this configuration is validated for 5.0 V → 1.8 V translation. The SN74LV1T34QDBVRQ1 maintains full functionality without damage or timing degradation, provided absolute maximum ratings (e.g., VI ≤ 7 V) are observed and input current limits are respected.