STG3155DTR

Overview

The STG3155DTR is a high-voltage, single-channel analog switch manufactured by STMicroelectronics. It operates within a supply voltage range of ±4V to ±20V and supports bidirectional signal transmission with low on-resistance. The device features robust ESD protection exceeding ±2kV according to the Human Machine Model (HMM) and ±200V according to the Charged Device Model (CDM). It includes an active pull-down resistor on the enable pin to ensure a defined off-state during power-up or reset conditions. The component is housed in a compact SOT-323 surface-mount package, designed for applications requiring reliable switching of audio, video, and data signals in space-constrained environments.

Feature Summary

• High-voltage operation supporting dual supplies up to ±20V
• Integrated active pull-down on the enable pin for safe startup states
• Robust electrostatic discharge protection compliant with HMM and CDM standards
• Low on-resistance for minimal signal attenuation in analog paths

Applications

• Audio and video signal routing in consumer electronics
• Data acquisition systems requiring isolated channel selection
• Communication equipment for line termination and switching
• Industrial control interfaces for sensor signal multiplexing

Procurement Notes

Verify the specific ordering code suffix to confirm the tape-and-reel packaging configuration and quantity per reel. Ensure the procurement source provides valid traceability documentation consistent with STMicroelectronics distribution channels. Cross-reference the date code against current production status to avoid obsolete stock. Confirm that the delivered components match the exact SOT-323 footprint and pinout specifications required by the design.

Selection Notes

Select this component when a single-channel, high-voltage analog switch is required with integrated enable functionality. The SOT-323 package is suitable for designs with strict board area limitations. Consider the on-resistance variation over temperature and voltage if precise signal integrity is critical. Verify that the input signal levels remain within the absolute maximum ratings relative to the supply rails to prevent latch-up or damage.

Part Context

The STG3155 belongs to STMicroelectronics' family of high-voltage analog switches, which are distinct from standard logic-level switches due to their ability to handle larger bipolar supply voltages. This series is engineered for robustness in noisy industrial and automotive environments. The DTR suffix indicates the specific surface-mount variant optimized for automated assembly processes, differentiating it from through-hole or alternative package options within the same functional family.

Replacement Considerations

Direct replacements must match the SOT-323 package and ±20V operating voltage. Verify pin compatibility for the STG3155DTR to ensure no redesign is necessary. Alternative parts should offer comparable on-resistance and ESD protection levels. Check for availability of equivalent devices from other manufacturers if supply constraints exist.