The SM712 series TVS diode array (SPA^® diodes) from Littelfuse are designed for protecting RS-485 applications with asymmetrical working voltages from damage due to electrostatic discharge (ESD), electrical fast transients (EFT), and lightning-induced surges. It can absorb repetitive ESD strikes above the maximum level specified in the IEC61000-4-2 international standard without performance degradation and safely dissipate up to 19 A of surge current with very low clamping voltages. This AEC-Q101 qualified device ensures maximum reliability in the harshest environments, so it is well suited for industrial applications, including protecting RS-485 ports in equipment such as security systems, ATMs, test equipment, automation, and communication networks.

TVS Diode Array

SPA® Family of TVS Diode Arrays

Features

• Robust surge and enhanced ESD protection: ESD, IEC61000-4-2: ±30 kV (contact); EFT, IEC61000-4-4: 50 A; Lightning, IEC61000-4-5: 19 A; Peak pulse power: 600 W
• Asymmetrical standoff voltage matches RS-485 transceiver profile: +12 V / -7 V
• Low dynamic resistance offers superb clamping performance: RDYN of 0.5 Ω (TYP)
• Minimal capacitive loading of 75 pF (MAX)

Benefits

• 50% higher power-handling capability than some other industry solutions gives design engineers more headroom against worldwide regulatory standards
• Ensures data lines are clamped to the lowest possible voltage without interfering in normal circuit operation
• Low dynamic-resistance equals fast-acting, low-clamping protection is ideal for protecting modern electronics
• Helps minimize data loss and signal degradation over long installations of RS-485 wiring
• Automotive grade quality ensures maximum reliability in the harshest environments