LTC6820HMS#3ZZPBF

Specialized Overview

The LTC6820HMS#3ZZPBF is an isoSPI isolated communications interface IC manufactured by Analog Devices Inc. It provides bidirectional SPI communication between two isolated devices via a single twisted-pair connection, bridging isolation barriers using standard pulse transformers. The device operates with a VDD supply voltage range of 2.7V to 5.5V and supports logic levels from 1.7V to 5.5V on the VDDS pin. It achieves data rates up to 1Mbps over cable lengths reaching 100 meters. Key electrical parameters include a typical active supply current of 4.8mA at 1MHz with RBIAS set to 2kΩ, and an ultralow idle current of 2µA. The component is housed in a 16-lead MSOP package and is qualified for automotive applications under AEC-Q100 standards.

Specialized Feature Summary

• Provides galvanic isolation for SPI interfaces using simple pulse transformers without requiring software changes in most systems
• Features configurable drive currents and comparator thresholds to optimize system performance for specific cable lengths and noise immunity requirements
• Supports automatic wake-up detection from an ultralow idle state to minimize power consumption
• Engineered for ISO26262 compliant systems with very low EMI susceptibility and emissions

Specialized Applications

• Industrial networking requiring robust isolated serial communication
• Battery monitoring systems in electric vehicles or energy storage
• Remote sensor arrays connected across isolation barriers

Specialized Procurement Notes

Verify that the #3ZZ suffix indicates automotive-grade manufacturing controls required for specific reliability standards. Confirm the MSOP package type matches the target PCB footprint. Ensure the temperature grade corresponds to the intended operational environment, as this part number specifies the industrial/high-temperature range. Cross-reference the datasheet revision to confirm compatibility with existing design specifications.

Specialized Selection Notes

Select this component when a bidirectional isolated SPI link is needed over a single twisted pair. The adjustable bias resistor allows trade-offs between power consumption and signal robustness. Ensure the application requires AEC-Q100 qualification if used in automotive contexts. Verify that the cable length and termination impedance align with the configured drive current settings for optimal signal integrity.

Specialized Part Context

This part belongs to the LTC6820 family of isoSPI isolated communication interfaces. The H suffix denotes the extended temperature range capability up to 125°C, while the MS package identifies the 16-lead plastic MSOP form factor. The #3ZZ suffix specifically marks it as an automotive-grade version designed to meet stricter quality and reliability requirements compared to standard commercial variants.

Specialized Replacement Considerations

Direct substitutes within the same family include LTC6820HMS#3ZZTRPBF (tape and reel) or LTC6820IMS#3ZZPBF (industrial temperature). Non-family replacements require careful evaluation of isoSPI protocol compatibility and isolation barrier specifications.