STMicroelectronics ESDA5V3LY

Overview

ESDA5V3LY from STMicroelectronics is an automotive-grade dual unidirectional Transil™ diode array for ESD protection of two signal lines, featuring 5.3 V minimum breakdown voltage (V_BR), 300 W peak pulse power (8/20 µs), and 220 pF line capacitance at 0 V bias-designed for CAN/LIN bus interfaces in automotive infotainment and body control modules.

For engineers reviewing the ESDA5V3LY datasheet, ESDA5V3LY pinout, ESDA5V3LY application, or ESDA5V3LY equivalent, key selection criteria include clamping voltage under 15 A surge (≤12 V), leakage current <20 µA at V_BR, AEC-Q101 qualification, ISO 10605 ±30 kV air/contact discharge compliance, and SOT23-3L footprint compatibility with high-density PCB layouts.

Technical Context

This dual-channel TVS array implements two independent unidirectional Transil structures in a single SOT23-3L package, each channel rated for 5.3–5.9 V breakdown and clamping ≤12 V at 15 A (8/20 µs). It supports bidirectional suppression when pins 1 and 2 are used alone, enabling flexible line protection without external polarity reversal.

Designed for automotive transients per ISO 7637-3, it withstands fast pulses (±100 V/±150 V) and slow pulses (±85 V) while maintaining low dynamic impedance (280 mΩ typical) and temperature-stable V_BR drift (α_T = 5 × 10⁻⁴/°C).

Key Specifications

Pinout & Package

SOT23-3L package: 3-pin surface-mount plastic case with gull-wing leads, ECOPACK® compliant, lead-free, UL 94 V0 epoxy, 8.7 mg unit weight, 3000-piece tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel unidirectional TVS applications.

Compared with ESDA6V1LY and TPD2E001DRYR, ESDA5V3LY offers the tightest V_BR tolerance for 5 V systems, AEC-Q101 assurance for under-hood deployment, and balanced capacitance for CAN/LIN-making it the preferred choice where precise 5.3 V turn-on and automotive qualification are mandatory.

Availability

ESDA5V3LY is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and sensor interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ESDA5V3LY 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.

ESDA5V3LY belongs to the ESDALY automotive Transil™ array product line, engineered specifically to meet stringent ISO 10605 and ISO 7637-3 immunity requirements in space-constrained vehicle electronics.

FAQ

Is ESDA5V3LY suitable for bidirectional signal lines like RS-485?

No. ESDA5V3LY is a dual unidirectional array: each channel conducts only from anode to cathode. For true bidirectional protection (e.g., RS-485), use a dedicated bidirectional array such as ESDALY5-1MU2 or configure two ESDA5V3LY units back-to-back. Its pin 1 and 3 are anodes; pin 2 is common cathode-so it cannot clamp positive transients on one line and negative on another simultaneously without external diodes.

What is the maximum recommended PCB trace length between ESDA5V3LY and protected IC?

Trace length should be ≤5 mm from ESDA5V3LY pin 1 or 3 to the protected IC pin, and ≤3 mm from pin 2 to the nearest low-inductance ground plane via. Longer traces increase inductance, raising clamping voltage during fast ESD events (e.g., 1 ns rise time), potentially exceeding the protected IC's absolute maximum rating-even if V_CL spec is met on the device itself.

Does ESDA5V3LY require external series resistance for USB 2.0 protection?

No external resistor is required for basic ESD protection. However, for USB 2.0 full-speed (12 Mbps) or high-speed (480 Mbps) compliance, a 0 Ω or 5–10 Ω series resistor may be added near the connector to dampen resonance caused by the 220 pF capacitance interacting with trace inductance-verified via TDR measurement. ST's AN2689 recommends this for >480 Mbps links.

How does temperature affect V_BR stability in ESDA5V3LY?

V_BR shifts with junction temperature at α_T = 5 × 10⁻⁴/°C, meaning a +100 °C rise above 25 °C increases V_BR by ~0.26 V (5.3 V × 0.0005 × 100). This positive TC ensures turn-on voltage rises safely under thermal stress, avoiding premature conduction during hot ambient operation-critical for under-hood LIN nodes operating continuously at 125 °C ambient.