Toshiba Semiconductor and Storage 7UL1T34FS,LF(B

Overview

7UL1T34FS,LF(B) from Toshiba Electronic Devices & Storage Corporation is a single-channel CMOS non-inverting level-shifting buffer IC designed for voltage translation between 1.2–2.7 V and 2.3–3.6 V domains. It supports bidirectional level shifting (up/down), features 3.6 V tolerant inputs, 3.6 V power-down output protection, and operates across –40 °C to +125 °C in automotive and industrial interface applications.

For engineers reviewing the 7UL1T34FS,LF(B) datasheet, 7UL1T34FS,LF(B) pinout, 7UL1T34FS,LF(B) application, or 7UL1T34FS,LF(B) equivalent, key selection criteria include input/output voltage translation capability, rail-to-rail output drive at ±8 mA, propagation delay under 7 ns over full temperature range, and SOT-953 package compatibility with space-constrained PCB layouts.

Technical Context

The 7UL1T34FS,LF(B) implements a single-stage CMOS buffer with dual-supply level-shifting architecture: the input stage accepts voltages up to 3.6 V independent of VCC, while the output stage swings rail-to-rail between GND and VCC (2.3–3.6 V). Its logic function is strictly non-inverting (A → Y), verified by truth table and IEC symbol.

It integrates power-down protection that disables output drivers when VCC = 0 V, preventing back-driving and bus contention. Input leakage remains ≤±2.0 µA over –40 to +125 °C, and quiescent ICC is ≤55 µA at max temperature - enabling low-power always-on interface bridging in battery-backed or hot-swap systems.

Key Specifications

Pinout & Package

7UL1T34FS,LF(B) is housed in a 5-pin SOT-953 (JEDEC MO-252) ultra-small surface-mount package measuring 1.6 × 1.6 × 0.55 mm (typ.), weighing 1.0 mg. Pin assignment is confirmed per Toshiba Rev.1.0.A datasheet (2026-04-21).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0102DCUR and SN74LVC1T45DBVR, the 7UL1T34FS,LF(B) offers simpler single-supply operation, guaranteed push-pull drive, and integrated power-down safety - making it optimal for unidirectional, space-constrained, automotive-grade level-shifting where reliability and layout simplicity are critical.

Availability

7UL1T34FS,LF(B) is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and medical sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7UL1T34FS,LF(B) 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor solutions for automotive, industrial, and consumer applications, with emphasis on energy efficiency and functional safety.

The 7UL1T34FS,LF(B) belongs to Toshiba's UL-series ultra-low-power logic family, engineered specifically for voltage domain bridging in compact, thermally demanding embedded systems where minimal footprint and guaranteed operation to +125 °C are mandatory.

FAQ

What is the logic function of the 7UL1T34FS,LF(B)?

The 7UL1T34FS,LF(B) is a non-inverting buffer with integrated level-shifting capability. It translates input signals between different voltage domains - supporting both up-translation (e.g., 1.8 V → 3.3 V) and down-translation (e.g., 3.3 V → 1.8 V) - while preserving logic polarity. The truth table confirms A = L → Y = L and A = H → Y = H, and this behavior is maintained across its full operating temperature and supply range.

Does the 7UL1T34FS,LF(B) require external pull-up or pull-down resistors?

No, the 7UL1T34FS,LF(B) does not require external pull-up or pull-down resistors. Its CMOS input structure has defined thresholds (VIH ≥ 1.1 V, VIL ≤ 0.5 V at VCC = 2.3–2.7 V), and the output is a push-pull driver capable of actively driving high or low. Unused inputs must still be tied to VCC or GND per Toshiba's operating range note, but no passive components are needed for normal operation of the 7UL1T34FS,LF(B).

What is the maximum propagation delay of the 7UL1T34FS,LF(B) at +125 °C?

At –40 °C to +125 °C ambient temperature, with CL = 15 pF and VCC = 2.3–3.6 V, the maximum propagation delay for the 7UL1T34FS,LF(B) is 6.5 ns for tPLH and 7.6 ns for tPHL, as specified in Section 9.6 of the Toshiba datasheet. These values ensure timing compliance in high-speed digital interfaces even under worst-case thermal conditions.

Can the 7UL1T34FS,LF(B) be used with a 1.8 V supply?

No - the 7UL1T34FS,LF(B) requires a minimum VCC of 2.3 V and is not rated for 1.8 V operation. Its absolute minimum supply voltage is 2.3 V, and all DC/AC specifications (including VIH/VIL thresholds and output drive) are guaranteed only within 2.3–3.6 V. Using 1.8 V would violate the operating range and may result in undefined logic behavior or excessive ICC. For 1.8 V systems, consider alternative translators explicitly rated for that rail.

Is Pin 5 (NC) on the 7UL1T34FS,LF(B) safe to connect to ground?

No - Pin 5 of the 7UL1T34FS,LF(B) is designated NC (No Connect) and must remain electrically floating. Toshiba's datasheet explicitly states it is internally unconnected; tying it to GND, VCC, or any other node may cause unpredictable behavior or damage. Layout guidelines require leaving Pin 5 unbonded and unconnected on the PCB - a critical requirement for reliable operation of the 7UL1T34FS,LF(B).