onsemi ESD8101FCT5G

Overview

ESD8101FCT5G from onsemi is an ultra-low-capacitance bidirectional ESD protection diode in a DSN2 (01005) package, designed for high-speed data lines including USB 3.0/3.1 and eSATA. It delivers 0.20 pF typical junction capacitance, 3.3 V reverse working voltage, and clamps to 6.5 V at 8 A TLP current while meeting IEC 61000−4−2 Level 4 (±23 kV contact/air).

For engineers reviewing the ESD8101FCT5G datasheet, pinout, applications, or equivalent options, key selection criteria include sub-0.4 pF capacitance, low clamping voltage under high-current ESD transients, compatibility with 01005 footprint constraints, and compliance with USB 3.x signal integrity requirements.

Technical Context

The ESD8101FCT5G employs a silicon avalanche diode structure optimized for fast response (<1 ns) and minimal parasitic capacitance. Its bidirectional configuration protects both positive and negative ESD events without polarity dependence, and its low dynamic resistance (0.46 Ω) ensures stable clamping across 8–16 A TLP pulses.

Designed specifically for differential high-speed interfaces, it maintains insertion loss < −2 dB up to 10 GHz per S21 measurements and exhibits flat capacitance (0.2–0.4 pF) from DC to 1 GHz - critical for preserving signal integrity on 5 Gbps+ serial links.

Key Specifications

Pinout & Package

ESD8101FCT5G is housed in a 2-terminal DSN2 (01005) package measuring 0.435 mm × 0.230 mm with 0.27 mm pitch. The package features a bottom-side thermal pad and is Pb-free, halogen-free, and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD8111FCT5G and TPD2E001DRYR, ESD8101FCT5G uniquely balances 01005 size, 0.20 pF capacitance, and ±23 kV protection - making it optimal for miniaturized USB 3.0/3.1 and eSATA implementations where signal integrity and board space are co-constrained.

Availability

ESD8101FCT5G is available at Aetrix Electronics and suitable for USB 3.0/3.1 interface protection, MHL 2.0 video link safeguarding, and eSATA data line shielding requiring stable component supply across production lifecycles.

Supply support for ESD8101FCT5G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The ESD81x1 series was developed specifically for high-speed serial interface protection, targeting design-in in next-generation USB, MHL, and eSATA systems where ultra-low capacitance and compact packaging are non-negotiable.

FAQ

What is the primary function of the ESD8101FCT5G?

The ESD8101FCT5G is a bidirectional ultra-low-capacitance ESD protection diode designed to safeguard high-speed data lines from electrostatic discharge. Its core function is to clamp transient voltages below damaging levels-specifically clamping to 6.5 V at 8 A TLP-while adding only 0.20 pF of capacitance to preserve signal integrity on interfaces such as USB 3.0/3.1. This makes ESD8101FCT5G ideal for point-of-entry protection near connectors or IC I/O pads.

Does the ESD8101FCT5G meet IEC 61000−4−2 Level 4 ESD immunity requirements?

Yes, the ESD8101FCT5G is rated for ±23 kV per IEC 61000−4−2 Level 4 for both contact and air discharge. This rating is explicitly confirmed in the "Maximum Ratings" table of the official onsemi datasheet (Rev. 7, March 2025). The device achieves this via low dynamic resistance (0.46 Ω) and fast avalanche response, enabling reliable clamping during fast-rising ESD events without degradation. ESD8101FCT5G thus satisfies the highest standard for end-equipment ESD immunity testing.

What package type and dimensions does the ESD8101FCT5G use?

The ESD8101FCT5G uses the DSN2 (01005) package, designated as Case 152AK by onsemi. Its physical dimensions are 0.435 mm × 0.230 mm with a 0.27 mm pin pitch. The package has two terminals: Pin 1 connects to the protected I/O line, and Pin 2 serves as the GND return. It is Pb-free, halogen-free, and RoHS compliant, and the datasheet provides recommended solder footprint dimensions for reliable reflow assembly. This ultra-compact form factor makes ESD8101FCT5G suitable for space-constrained mobile and portable designs.

Can the ESD8101FCT5G be used for USB 3.1 Gen 2 (10 Gbps) applications?

Yes, the ESD8101FCT5G is validated for USB 3.1 Gen 2 applications. Its 0.20 pF typical junction capacitance and measured S21 insertion loss of < −2 dB up to 10 GHz (per Figure 3 in the datasheet) ensure minimal impact on 10 Gbps signal integrity. The device's low clamping voltage (6.5 V @ 8 A TLP) and fast response (<1 ns) protect sensitive USB 3.1 PHY receivers without introducing jitter or eye closure. ESD8101FCT5G is therefore appropriate for Gen 2 implementations where board space and signal fidelity are critical.

Is the ESD8101FCT5G still recommended for new designs?

No-the official onsemi datasheet (Rev. 7, March 2025) states "DISCONTINUED: This device is not recommended for new design." While ESD8101FCT5G remains available for legacy production and repair, onsemi advises contacting their representative for migration paths. Engineers designing new systems should evaluate alternatives such as ESD8111FCT5G (same family, 0201, ±30 kV) or newer generation devices. Aetrix Electronics supports continuity sourcing for ESD8101FCT5G but recommends verifying long-term roadmap alignment before committing to new designs.