STMicroelectronics ESDAULC5-1BF4

Overview

ESDAULC5-1BF4 from STMicroelectronics is a bidirectional single-line TVS diode for ESD protection of high-speed data lines, featuring 1.5–3 pF line capacitance, 13.5 V clamping voltage at 30 ns (IEC 61000-4-2), and 0.3 Ω dynamic resistance in ST0201 package. It targets space-constrained mobile interfaces including USB 2.0, HDMI, and MIPI D-PHY.

For engineers reviewing the ESDAULC5-1BF4 datasheet, ESDAULC5-1BF4 pinout, ESDAULC5-1BF4 application, or ESDAULC5-1BF4 equivalent, key selection criteria include ultra-low capacitance (<3 pF), sub-14 V clamping under 8/20 µs transients, ST0201 footprint compatibility, and ±30 kV IEC 61000-4-2 contact/air discharge compliance.

Technical Context

This device implements a silicon avalanche structure optimized for fast response to ESD events (sub-nanosecond turn-on) while maintaining low parasitic capacitance. Its bidirectional symmetry enables protection on AC-coupled or differential signal paths without polarity constraints.

The ST0201 package integrates both anode and cathode terminals in a 0.60 × 0.30 mm outline with 0.18 mm² PCB area, enabling placement directly adjacent to connectors or IC I/O pads. Thermal resistance is minimized via direct die-to-pad conduction path.

Key Specifications

Pinout & Package

ESDAULC5-1BF4 uses the ST0201 package: 0.60 mm × 0.30 mm × 0.23 mm body, 0.18 mm² PCB footprint, compatible with fine-pitch SMT assembly. Marking "L" identifies Pin 1; orientation may be rotated ±90° or 180° per assembly location differentiation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional ESD protection applications.

Compared with TPD1E05U06DPYR and SP1001-01UTG, ESDAULC5-1BF4 delivers optimal balance of 10 A surge capability, ±30 kV ESD immunity, and 1.5–3 pF capacitance-making it preferred for mainstream mobile I/O protection where cost, size, and robustness are jointly constrained.

Availability

ESDAULC5-1BF4 is available at Aetrix Electronics and suitable for smartphone USB interfaces, tablet HDMI DDC channels, MIPI D-PHY clock lanes, and waterproof audio jack circuits requiring stable component supply across high-volume production cycles.

Supply support for ESDAULC5-1BF4 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power management ICs, sensors, and protection devices for automotive, industrial, and consumer markets.

ESDAULC5-1BF4 belongs to ST's Ultra-Low Capacitance ESD Protection portfolio, engineered specifically for high-speed digital interfaces where signal fidelity and board space are primary constraints.

FAQ

What is the maximum recommended trace length between ESDAULC5-1BF4 and the protected I/O pin?

ST recommends ≤3 mm trace length from device to I/O pin to minimize inductance that could degrade clamping performance. Longer traces increase peak voltage overshoot during ESD events; for USB 2.0, keep trace impedance near 90 Ω differential and avoid stubs or vias between protector and connector.

Does ESDAULC5-1BF4 require a dedicated ground plane connection?

Yes - Pin 2 must connect directly to a low-inductance system ground plane using a short, wide trace (≥0.3 mm) and ≥2 thermal vias to inner ground layers. Shared ground returns with noisy power circuits will compromise ESD suppression effectiveness and increase coupling into adjacent signals.

Can ESDAULC5-1BF4 protect against electrical fast transients (EFT) per IEC 61000-4-4?

No - ESDAULC5-1BF4 is characterized and rated only for ESD per IEC 61000-4-2. Its 140 W peak pulse power rating applies to 8/20 µs waveforms, not the 5/50 ns EFT bursts. For EFT immunity, add a series ferrite bead or RC filter upstream of the TVS.

Is the ST0201 package compatible with standard 0201 pick-and-place equipment?

Yes - ST0201 matches 0201 land patterns and is supported by major SMT placement systems using optical fiducial recognition. ST specifies ±0.05 mm placement tolerance and recommends bottom-side optical inspection due to its 0.23 mm height and small pad area (0.18 mm²).