STMicroelectronics ESDARF02-1BU2CK

Overview

ESDARF02-1BU2CK from STMicroelectronics is a bidirectional single-line TVS diode for high-speed interface ESD protection, featuring 0.2 pF typical line capacitance, 30 GHz bandwidth, 8 kV contact/15 kV air IEC 61000-4-2 compliance, and ST0201 (0201) SMD package occupying only 0.18 mm² PCB area-used in smartphone antenna and USB 3.1 data line protection.

For engineers reviewing the ESDARF02-1BU2CK datasheet, ESDARF02-1BU2CK pinout, ESDARF02-1BU2CK application, or ESDARF02-1BU2CK equivalent, key selection criteria include ultra-low capacitance for RF signal integrity, sub-12 V clamping at 1 A, dynamic impedance of 1.3 Ω, junction temperature range from –40 °C to +150 °C, and ECOPACK®2/RoHS-compliant packaging for portable electronics design.

Technical Context

This device employs a silicon avalanche diode structure optimized for bidirectional transient suppression on high-frequency signal paths. Its low parasitic capacitance (0.2–0.3 pF) and 30 GHz –3 dB bandwidth ensure minimal insertion loss and phase distortion in RF front-end and high-speed digital interfaces up to 10 Gbps.

The ESDARF02-1BU2CK operates with a standoff voltage of 3.6 V, breakdown at 5–6.6 V (1 mA), and clamps to ≤12 V under 1 A (8/20 µs pulse). Dynamic resistance is specified at 1.3 Ω, enabling fast energy dissipation while maintaining signal fidelity in compact mobile PCB layouts.

Key Specifications

Pinout & Package

ESDARF02-1BU2CK uses the ST0201 (0201 metric) surface-mount package: 0.60 mm × 0.30 mm footprint, 0.28 mm height, with pin 1 marked by a bar on the top side. The device has two terminals in a symmetrical layout; polarity is non-directional due to bidirectional construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and SP1002-01UTG, ESDARF02-1BU2CK delivers the lowest capacitance (0.2 pF) and highest bandwidth (30 GHz), making it uniquely suited for 5G FR1, Wi-Fi 6E, and UWB antenna protection where signal fidelity and miniaturization are critical.

Availability

ESDARF02-1BU2CK is available at Aetrix Electronics and suitable for smartphone antenna protection, USB 3.1 SuperSpeed data line safeguarding, and Wi-Fi 6E front-end ESD suppression requiring stable component supply across high-volume consumer electronics programs.

Supply support for ESDARF02-1BU2CK 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, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal components for automotive, industrial, and consumer markets.

The ESDARF series targets ultra-high-frequency ESD protection for RF and high-speed digital interfaces, with emphasis on minimizing parasitic effects while meeting stringent IEC 61000-4-2 and AEC-Q200 requirements.

FAQ

What is the maximum peak pulse current rating for ESDARF02-1BU2CK?

The device is rated for 1.5 A peak pulse current (8/20 µs waveform) per IEC 61000-4-2 testing conditions. This value reflects its ability to safely divert a single 8 kV contact discharge event without failure, provided PCB layout minimizes trace inductance and thermal mass is adequate for transient dissipation.

Can ESDARF02-1BU2CK be used on differential high-speed interfaces like MIPI D-PHY?

Yes-it is commonly deployed on individual MIPI D-PHY lanes (CLK, DATA0–DATA3) due to its bidirectional symmetry and 0.2 pF capacitance, which avoids skew imbalance and maintains common-mode rejection. Layout must maintain matched trace lengths and avoid ground plane cuts beneath the device to preserve impedance control.

Does ESDARF02-1BU2CK require orientation during placement?

No-its bidirectional architecture means Terminal 1 and Terminal 2 are functionally identical; the bar marking indicates pin 1 solely for assembly verification and does not affect electrical performance. Rotation by 180° is permitted per ST's documentation and does not impact ESD protection capability.

How does the 30 GHz bandwidth translate to real-world signal integrity?

A 30 GHz –3 dB bandwidth ensures less than 0.5 dB insertion loss at 6 GHz (covering all 5G FR1 bands), negligible group delay variation across Wi-Fi 6E channels, and no resonant peaks up to third harmonic of 10 Gbps NRZ signals-critical for maintaining eye height and jitter margin in high-speed serial links.