Diodes Incorporated PI4ULS5V201XVE

Overview

PI4ULS5V201XVE from Diodes Incorporated (acquired Pericom Semiconductor) is a 1-bit bidirectional auto-sensing level shifter enabling voltage translation between independent 1.2 V–5.5 V rails (VCCA and VCCB), with integrated 10 kΩ pull-up resistors, 20 Mb/s push-pull data rate, and no direction-control pin required - deployed in I²C/SMBus interconnects between mixed-voltage SoCs and peripherals.

For engineers reviewing the PI4ULS5V201XVE datasheet, PI4ULS5V201XVE pinout, PI4ULS5V201XVE application, or PI4ULS5V201XVE equivalent, key selection criteria include rail-flexible bidirectional operation, open-drain compatibility (2 Mb/s), EN-controlled tri-state, low quiescent current (≤5 µA), and UDFN1.2×1.6-8L footprint for space-constrained mobile and embedded designs.

Technical Context

The PI4ULS5V201XVE implements dual-supply auto-sensing logic using one-shot edge detectors on each I/O channel to determine signal direction dynamically - eliminating external direction control. Its internal architecture supports simultaneous A→B and B→A translation without contention, with propagation delays ≤20 ns across all VCCA/VCCB combinations.

It integrates rail-selectable 10 kΩ pull-up resistors tied to either VCCA or VCCB per I/O line, reducing external component count for I²C bus termination. The EN pin (referenced to VCCA) enables full I/O tri-state with leakage <1 µA, and power-up sequencing is non-preferential - VCCA and VCCB may ramp independently without latch-up risk.

Key Specifications

Pinout & Package

Package: UDFN1.2×1.6-8L (0.4 mm pitch, wettable flank), 0.55 mm height - optimized for automated optical inspection and fine-pitch PCB assembly in mobile and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0102DCUR and PCA9306DCUR, the PI4ULS5V201XVE uniquely combines 20 Mb/s push-pull performance, integrated pull-ups, and rail-flexible auto-sensing in a single-bit UDFN package - making it optimal for space-constrained, mixed-speed I/O bridging where BOM reduction and timing margin are critical.

Availability

PI4ULS5V201XVE is available at Aetrix Electronics and suitable for I²C interfacing, mobile baseband–AP links, SMBus power management, and MDIO PHY–MAC communication requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PI4ULS5V201XVE 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

Diodes Incorporated acquired Pericom Semiconductor in 2017 and now manufactures and supports the PI4ULS5V201XVE as part of its broad interface solutions portfolio.

This device belongs to Diodes' auto-sensing level translator product line, engineered specifically for low-pin-count, rail-flexible I/O bridging in mobile, computing, and industrial systems with mixed-voltage architectures.

FAQ

Can PI4ULS5V201XVE translate between 1.2 V and 5.5 V simultaneously?

Yes. The device supports VCCA = 1.2 V and VCCB = 5.5 V (or vice versa) per its absolute maximum ratings and recommended operating conditions. DC electrical characteristics - including VIH/VIL thresholds and VOH/VOL levels - are guaranteed across this full range, and timing parameters (e.g., 20 Mb/s data rate, ≤20 ns propagation delay) remain valid per datasheet Tables 3–5 under these extreme rail pairings.

Is the EN pin 5.5 V tolerant when VCCA = 1.2 V?

Yes. The EN pin is overvoltage tolerant up to 5.5 V regardless of VCCA level, as confirmed in the Functional Description section and Absolute Maximum Ratings table. This allows direct connection to a higher-voltage system controller (e.g., 3.3 V EN signal driving a 1.2 V VCCA domain) without level-shifting circuitry.

Do the integrated 10 kΩ pull-ups require external bypassing or adjustment?

No. The internal 10 kΩ pull-ups are factory-trimmed and fully functional for standard I²C/SMBus operation. External parallel resistors may be added only if lower effective pull-up resistance is needed (e.g., for faster rise times on heavy buses), but decoupling capacitors (0.01–0.1 µF ceramic) are required on VCCA and VCCB pins per the Power Supply Guidelines section.

What is the thermal performance of the UDFN1.2×1.6-8L package?

The UDFN1.2×1.6-8L package has a junction-to-ambient thermal resistance (θ_JA) of 210°C/W, verified per JEDEC JESD51-7 test conditions. At maximum rated ambient temperature (+85°C) and worst-case 5 µA quiescent current, junction temperature rise is <1°C - confirming suitability for sealed, convection-limited environments such as wearable enclosures.