ST2349QTR

Translators, Level Shifters Overview

The ST2349QTR is a 4-bit dual supply level translator manufactured by STMicroelectronics. It facilitates bidirectional data transfer in multi-voltage systems without requiring a direction control pin, utilizing a transmission gate-based design. The device supports a VCC range of 1.80 V to 5.5 V and a VL range of 1.65 V to 3.6 V. It achieves a maximum data rate of 45 Mbps with totem pole drivers and 4 Mbps with open drain drivers. Key features include power-down mode for high-impedance I/Os when supplies are off, low quiescent current, and 5.5 V tolerant enable pins. It offers ±2 kV HBM ESD protection and is housed in a compact QFN16 package measuring 2.6 x 1.8 mm.

Translators, Level Shifters Feature Summary

• Bidirectional level translation without direction control pin
• Power down mode feature for high impedance I/Os
• Wide voltage range support for both A and B sides

Translators, Level Shifters Applications

• Low voltage system level translation
• Mobile phones and other mobile devices
• I2C level translation
• UART level translation

Translators, Level Shifters Procurement Notes

Verify the specific datasheet revision and package marking for the ST2349QTR variant before integration. Confirm that the target application environment does not exceed the specified 5.5 V tolerance on enable pins or the ±2 kV HBM ESD limits. Ensure supply voltages remain within the defined VCC and VL ranges to maintain correct logic levels and prevent damage during power-up or power-down sequences.

Translators, Level Shifters Selection Notes

Select this component when a direction control pin is undesirable for bidirectional translation between 1.8 V–5.5 V and 1.65 V–3.6 V domains. It is suitable for applications requiring moderate data rates up to 45 Mbps with totem pole drivers. Consider the QFN16 footprint constraints and the need for power-down high-impedance states when designing multi-voltage interfaces.

Translators, Level Shifters Part Context

The ST2349 series belongs to STMicroelectronics' portfolio of voltage level translators designed for mixed-voltage digital systems. Unlike controlled-direction translators, this 4-bit variant simplifies circuit design by eliminating the direction control pin, relying instead on the transmission gate architecture to automatically manage signal flow based on voltage differentials across the A and B ports.

Translators, Level Shifters Replacement Considerations

Public confirmed substitute part numbers: ST2349A, ST2349AQTR.