STMicroelectronics ESDA19SC6

Overview

ESDA19SC6 from STMicroelectronics is a quad unidirectional Transil™ ESD protection array in SOT23-6L package, designed to clamp transient overvoltages on data lines to ≤15 V at 13 A peak pulse current while maintaining 19 V breakdown and <0.1 µA leakage at 15 V standoff. It delivers 400 W (8/20 µs) peak pulse power and meets IEC 61000-4-2 Level 4 (30 kV air/contact discharge) for USB, HDMI, and audio interface protection.

For engineers reviewing the ESDA19SC6 datasheet, ESDA19SC6 pinout, ESDA19SC6 application, or ESDA19SC6 equivalent, key selection criteria include clamping voltage under 13 A stress, sub-80 pF capacitance at 0 V bias, unidirectional channel isolation, and compatibility with high-density PCB layouts requiring SOT23-6L footprint and lead-free ECOPACK® compliance.

Technical Context

The ESDA19SC6 integrates four independent unidirectional avalanche diodes in a single monolithic silicon chip, each configured as a cathode-to-rail clamp for positive transients and anode-to-ground path for negative transients. Its architecture enables rail-to-rail clamping without internal series resistance or steering diodes.

It operates across –55 °C to +150 °C junction temperature, with dynamic resistance of 13 Ω and forward voltage drop of 1.2 V at 10 mA - enabling fast response (<1 ns) to ESD events while minimizing signal distortion on high-speed lines such as USB 2.0 and I²C.

Key Specifications

Pinout & Package

SOT23-6L (SC-59) thermally enhanced plastic package with gull-wing leads, ECOPACK® lead-free finish, UL94 V0 epoxy, and 16.7 mg unit weight. Compatible with reflow soldering per JEDEC J-STD-020 (MSL3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESDA14V2SC6 and ESDA25SC6, the ESDA19SC6 offers optimal balance for 5 V embedded interfaces - delivering 19 V standoff to avoid false triggers on 5 V rails while maintaining 15 V clamping and 80 pF capacitance needed for USB 2.0 signal fidelity.

Availability

ESDA19SC6 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI DDC line hardening, and automotive infotainment audio circuits requiring stable component supply and long-term lifecycle support.

Supply support for ESDA19SC6 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 protection devices for automotive, industrial, and consumer markets.

The Transil™ ESDAxxSCx product line targets high-reliability board-level ESD suppression in space-constrained applications, emphasizing low capacitance, precise breakdown control, and compliance with IEC 61000-4-2 Level 4 across automotive and industrial temperature ranges.

FAQ

What is the maximum recommended trace inductance between ESDA19SC6 and protected I/O pin?

STMicroelectronics specifies ≤3 nH total loop inductance from device cathode/anode to IC pad and ground return. This requires direct placement within 2 mm of the connector or IC pin, use of solid ground plane beneath the device, and avoidance of vias in the ESD current path. Exceeding this inductance raises clamping voltage by up to 3 V per nanosecond of ESD rise time.

Can ESDA19SC6 be used for bidirectional signal lines like RS-485 A/B?

Yes - by connecting two channels back-to-back (e.g., pin 1–2 and pin 5–6) across the differential pair with shared GND (pin 4), it forms a symmetrical clamp with 19 V standoff in both directions. The unidirectional architecture requires external routing to achieve true bidirectional behavior, unlike dedicated bidirectional arrays.

Does ESDA19SC6 require series impedance on protected lines?

No series resistor is required for ESD protection function, but a 0 Ω or 10 Ω current-limiting resistor may be added upstream to reduce peak current into the clamp during extreme surges. ST's application note AN4127 confirms full IEC 61000-4-2 compliance without external impedance when layout guidelines are followed.

How does temperature affect ESDA19SC6's clamping performance?

VBR increases by 130 mV/°C (αT = 10⁻⁴/°C) above 25 °C, raising clamping threshold proportionally. At +125 °C junction, VBR rises to ~20.3 V and VCL increases to ~15.8 V at 13 A. Derating curves in Figure 3 show 70% peak power capability at 125 °C ambient, confirming suitability for under-hood automotive use.