Texas Instruments SN74AUP1T34DRYR

Overview

SN74AUP1T34DRYR from Texas Instruments is a 1-bit unidirectional noninverting voltage-level translator with dual configurable supply rails (VCCA and VCCB), supporting translation between 0.9 V and 3.6 V logic domains. It delivers balanced propagation delays (e.g., 3.39 ns typical at 3 V → 3 V, CL = 5 pF), ±6-mA output drive at 3 V, and Ioff-enabled partial power-down operation. It is used in Bluetooth/WiFi/baseband module interconnects where low-voltage, low-power level shifting is required.

For engineers reviewing the SN74AUP1T34DRYR datasheet, SN74AUP1T34DRYR pinout, SN74AUP1T34DRYR application, or SN74AUP1T34DRYR equivalent, key selection criteria include verified dual-rail voltage range (0.9–3.6 V per rail), guaranteed high-impedance state during VCCA = GND (VCC isolation), input hysteresis for slow-edge immunity, and SON-6 package thermal metrics (RθJA = 338.5 °C/W).

Technical Context

The SN74AUP1T34DRYR implements a single-channel A-to-B unidirectional translation path with independent VCCA and VCCB supplies. Its internal circuitry enforces strict directionality: signal flows only from A (VCCA-referenced) to B (VCCB-referenced), with no reverse conduction path. The device uses MOSFET-based translation architecture with integrated input hysteresis (200 ns/V minimum input slew tolerance) and active Ioff control that disables outputs when either supply is at 0 V.

VCC isolation is implemented via dedicated sensing of VCCA and VCCB; if either supply drops below ~0.4 V, both ports enter high-impedance mode regardless of input state. This prevents bus contention in partial-power-down systems such as portable baseband subsystems where RF and baseband sections power up/down independently.

Key Specifications

Pinout & Package

The SN74AUP1T34DRYR is housed in a 6-pin SON (DRY) package measuring 1.45 mm × 1.00 mm with 0.5-mm pitch and exposed thermal pad. Pin 1 is located at the top-left corner (Q1 quadrant per tape orientation), and the package features no leads - solderable bottom terminals only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0101DRYR and SN74AVC1T45DBVR, the SN74AUP1T34DRYR uniquely combines guaranteed unidirectionality, VCC isolation, and Ioff in a 1.45-mm × 1.00-mm SON package - making it optimal for safety-critical power-gated wireless subsystems where bus integrity during partial power-down is non-negotiable.

Availability

SN74AUP1T34DRYR is available at Aetrix Electronics and suitable for Bluetooth module interconnects, WiFi baseband interfaces, and processor I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for SN74AUP1T34DRYR 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 over 50 years of leadership in precision analog design and low-power innovation.

The SN74AUP1T34DRYR belongs to TI's AUP (Advanced Ultra-Low-Power) logic family, engineered specifically for energy-constrained, space-limited wireless and portable electronics where sub-1-V operation, nanowatt quiescent current, and ultra-small packaging are essential.

FAQ

What is the maximum supported voltage difference between VCCA and VCCB for SN74AUP1T34DRYR?

The SN74AUP1T34DRYR supports any combination of VCCA and VCCB within 0.9 V to 3.6 V each, including maximum differential operation such as VCCA = 0.9 V and VCCB = 3.6 V. Absolute maximum ratings permit up to 4 V on either supply, but recommended operation strictly limits both to ≤3.6 V. This allows full 0.9-V-to-3.6-V up/down translation without derating.

Does SN74AUP1T34DRYR support bidirectional translation?

No, SN74AUP1T34DRYR is strictly unidirectional - signal flow is A-to-B only. It lacks auto-sensing or direction-control circuitry. Attempting reverse signal injection (B-to-A) may result in undefined output states or excessive current draw. For bidirectional use cases, TI recommends alternatives like TXS0101DRYR.

How does the VCC isolation feature behave when VCCA = 0 V and VCCB = 3.3 V?

When VCCA = 0 V (GND), the SN74AUP1T34DRYR forces the B port into high-impedance state regardless of A input or VCCB voltage. This is confirmed in Section 8.3.3 of the datasheet: "if VCCA input is at GND, B port is in the high-impedance state." VCCB = 3.3 V remains powered but has no effect on B output until VCCA rises above ~0.4 V.

Can SN74AUP1T34DRYR drive a 50-Ω transmission line directly?

Yes - SN74AUP1T34DRYR provides ±6-mA output drive at 3 V, which supports direct termination into 50-Ω loads (requiring ≤60 mA for full swing). At 3.3 V, VOH reaches 2.72 V and VOL stays ≤0.31 V under 6-mA load, meeting standard LVCMOS drive requirements for short-run PCB traces. For longer lines, add series termination.

Is the NC pin on SN74AUP1T34DRYR required to be left floating?

Yes, the NC (pin 5) on SN74AUP1T34DRYR is internally unconnected and must remain electrically floating - no connection to GND, VCC, or signal nets. TI's mechanical drawing and pin function table explicitly define it as "No Connect. Leave floating." Tying it to any potential risks unintended coupling or violates layout guidelines in Section 11.1.