ESDALY STMicroelectronics Diode ESD (Uni-directional) (SOT23 (3-Pin)) In Stock
ESDALY is an automotive-grade dual Transil TVS array in a compact SOT-23 package from STMicroelectronics, providing bidirectional ESD protection for two signal lines simultaneously up to AEC-Q101 automotive qualification. Available in stock worldwide with fast shipping.
- Manufacturer
- STMicroelectronics
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- ESDALY Datasheet PDF
- Category
- Diode ESD (Uni-directional)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual-channel TVS array protects 2 signal lines in a single SOT-23 3-pin package, halving component count versus discrete TVS diodes
- Automotive AEC-Q101 qualified for reliable ESD clamping in harsh -40°C to +125°C under-hood environments
- Transil technology delivers fast sub-nanosecond response time to clamp ESD transients before they damage downstream ICs
- Low clamping voltage preserves signal integrity on 3.3 V and 5 V automotive CAN, LIN, and sensor lines
- Uni-directional and bi-directional variants available to match positive-only or AC-coupled interface requirements
Applications
The ESDALY protects automotive ECU signal inputs such as CAN bus lines, LIN bus interfaces, and analog sensor inputs from electrostatic discharge and conducted transients generated during cable assembly or hot-plug events. Its dual-channel SOT-23 configuration makes it ideal for space-constrained automotive PCBs where two adjacent signal pins need simultaneous protection without adding a larger TVS array package. It is also used in industrial motor-drive control boards and telematics modules that must comply with IEC 61000-4-2 ESD immunity standards.
Specifications
| Diode Type | TRANS VOLTAGE SUPPRESSOR DIODE |
| Package | SOT23 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8541.10.00.50 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
For which automotive signal interfaces is the ESDALY dual TVS array most suitable?
The ESDALY is engineered for protecting low-voltage automotive interfaces including CAN bus (nominally 5 V differential), LIN bus single-wire signals at 12 V, and analog sensor lines typically operating at 0 V to 5 V. Its AEC-Q101 automotive qualification and -40°C to +125°C operating range ensure reliable clamping in engine-bay and transmission-control ECUs exposed to severe thermal cycling.
How fast does the ESDALY clamp an ESD transient, and why does response time matter?
The ESDALY Transil TVS technology clamps ESD transients in sub-nanosecond response time, typically under 1 ns. This fast response is critical because IEC 61000-4-2 Level 4 ESD events rise in under 1 ns and can reach 8 kV contact discharge. A slow response allows the full transient to reach downstream IC input stages before clamping begins, potentially causing latch-up or gate-oxide damage in microcontrollers and transceivers.
How does the dual-channel SOT-23 package of the ESDALY reduce PCB area compared to discrete TVS diodes?
A discrete unidirectional TVS diode in SOD-323 occupies roughly 1.7 mm x 1.25 mm per protected line, so protecting 2 lines requires 2 components and about 4.25 mm² of board area plus routing. The ESDALY SOT-23 package measures approximately 2.9 mm x 1.6 mm (4.6 mm²) and integrates both channels, delivering a net area saving while reducing the number of solder joints from 4 to 3, which improves assembly yield.
Is the ESDALY compatible with 3.3 V logic interfaces, and will it cause excessive capacitive loading?
Yes — the ESDALY is designed for 3.3 V and 5 V signal lines, with a standoff voltage that prevents conduction in normal operation and only clamps during ESD events. The junction capacitance per channel is typically in the range of 5 pF to 15 pF, low enough to avoid significant signal degradation on CAN and LIN data rates up to 1 Mbit/s, though engineers should verify exact capacitance from the datasheet for high-speed interfaces above 10 Mbit/s.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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