Texas Instruments ESD551/ESD551-Q1 Bidirectional ESD Diodes
Texas Instruments ESD551/ESD551-Q1 Bidirectional ESD Diodes protect power lines, low-speed data lines, and I/O ports against transient events. The one-channel devices provide IEC 61000-4-2 Level 4 protection and IEC 61000-4-5 surge protection in a compact 0402 package. The device's low capacitance supports data-line protection for protocols such as RS232 and RS485.
The TI ESD551/ESD551-Q1 Diodes incorporate low dynamic resistance, low leakage current, and bidirectional operation for space-constrained designs. The automotive ESD551-Q1 adds AEC-Q101 qualification and ISO 10605 ESD protection. Applications include RS232, RS485, 12V power lines, and GPIO interfaces.
Features
- IEC 61000-4-2 Level 4 ESD protection
- IEC 61000-4-5 surge protection
- Bidirectional operation for power lines, low-speed data lines, and I/O ports
- Low capacitance for data-line protection
- Low dynamic resistance for system-level transient protection
- Low leakage current
- Space-saving industry-standard 0402 footprint
- ESD551-Q1 AEC-Q101 qualified
- ISO 10605 ESD protection
Applications
- RS232
- RS485
- 12V power line
- GPIO
Specifications
- One protected channel
- IEC 61000-4-2 contact-discharge protection of ±30kV
- IEC 61000-4-2 air-gap-discharge protection of ±30kV
- IEC 61000-4-5 surge current of 7A with an 8/20µs waveform
- Peak pulse power of 200W
- Reverse stand-off voltage of ±12V
- Typical I/O capacitance of 2.8pF
- Maximum leakage current of 100nA
- Minimum breakdown voltage of 13.3V
- Surge clamping voltage of 30.2V at 7A
- TLP clamping voltage of 22.5V at 16A
- Typical dynamic resistance of 0.29Ω
- Two-pin DFN1006 package
- Package dimensions of 1.0mm x 0.6mm
- ESD551 operating temperature range of -40°C to +125°C
- ESD551-Q1 operating temperature range of -55°C to +150°C
- ESD551-Q1 human body model ESD rating of ±2500V
- ESD551-Q1 charged device model ESD rating of ±1000V
Functional Block Diagram
Published: 2026-10-23
| Updated: 2026-10-27