Nexperia USA Inc. 74AXP2T45GXX

Overview

74AXP2T45GXX from Nexperia is a 2-bit dual-supply bidirectional translating transceiver with 3-state outputs, enabling level translation between independent voltage domains (0.9 V to 5.5 V on both VCC(A) and VCC(B)). It features DIR-controlled directionality, IOFF-enabled partial power-down, and patented glitch-free supply transitions. Used in mixed-voltage SoC interconnects, such as FPGA-to-ASIC I/O bridging across 1.8 V and 3.3 V rails.

For engineers reviewing the 74AXP2T45GXX datasheet, 74AXP2T45GXX pinout, 74AXP2T45GXX application, or 74AXP2T45GXX equivalent, key selection criteria include dual-rail voltage flexibility, sub-15 ns propagation delay at 3.3 V/2.5 V, IOFF leakage < ±2 μA during suspend mode, and guaranteed operation from –40 °C to +125 °C in X2SON8 packaging.

Technical Context

The device implements a dual-reference transceiver architecture: pins A and DIR are referenced to VCC(A), while pins B are referenced to VCC(B); no shared ground reference is required between domains. Direction control is synchronous-DIR HIGH enables A→B data flow, DIR LOW enables B→A flow-with independent 3-state control per port.

IOFF circuitry actively disables outputs when either VCC(A) or VCC(B) is at GND, forcing both ports into high-impedance OFF-state and limiting backflow current to ≤±2 μA. Glitch suppression operates across supply ramp rates from 20 mV/μs to 5.5 V/s, eliminating output disturbances during asymmetric power-up/down sequences.

Key Specifications

Pinout & Package

X2SON8 package (SOT1233-2): 1.35 × 0.8 × 0.32 mm, thermal-enhanced, leadless, 8-terminal surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0102DCUR and SN74AVC2T245RSWR, the 74AXP2T45GXX uniquely delivers independent dual-rail control, guaranteed glitch-free operation across full supply ramp profiles, and IOFF compliance down to –40 °C, making it the sole option qualified for safety-critical mixed-voltage subsystems.

Availability

74AXP2T45GXX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor hubs, FPGA interconnects, and server baseboard management requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74AXP2T45GXX 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

Nexperia is a global semiconductor expert delivering high-performance, reliable, and energy-efficient components for automotive, industrial, and consumer markets.

The 74AXP series targets ultra-low-power, wide-voltage-range logic translation for next-generation mixed-signal systems where supply independence, thermal resilience, and fail-safe power sequencing are mandatory.

FAQ

What is the maximum allowable voltage difference between VCC(A) and VCC(B)?

No maximum differential is specified-the device is designed for fully independent supply domains. Both rails may operate anywhere from 0.9 V to 5.5 V simultaneously, including scenarios where VCC(A) = 0.9 V and VCC(B) = 5.5 V. Absolute maximum ratings limit each supply to –0.5 V to +6.5 V relative to GND, but inter-rail differential is unrestricted.

Does the 74AXP2T45GXX require external pull-up resistors on the B-side I/O lines?

No external pull-ups are required on the B-side. The device supports open-drain emulation via 3-state control and maintains valid logic levels across its full VCC(B) range (0.9 V–5.5 V). Pull-ups are only needed if the connected B-side device mandates them for protocol compliance (e.g., I²C), and those would be placed externally on the B-side net-not on the transceiver itself.

How does the IOFF feature behave when only VCC(A) is powered?

When VCC(A) = 5.5 V and VCC(B) = 0 V (GND), the A-port outputs enter high-impedance OFF-state and IOFF leakage is limited to ±2 μA maximum at 125 °C. The B-port remains inactive and presents no load-no current flows into or out of B pins, protecting downstream 3.3 V or 5 V devices from backfeed damage.

Can DIR be driven by a 1.2 V GPIO while VCC(A) = 3.3 V?

Yes. Input thresholds scale with VCC(A): VIH(min) = 0.7 × VCC(A) = 2.31 V at 3.3 V, so a 1.2 V GPIO cannot directly drive DIR HIGH. However, the device complies with JEDEC JESD8-12 (1.1 V–1.3 V inputs), meaning DIR accepts 1.2 V logic when VCC(A) = 1.2 V. For mixed-voltage DIR control, use a dedicated level-shifter or configure VCC(A) to match the DIR source voltage.