Since the question seems oriented towards an IC that provides bidirectional level shifting, consider the Texas Instruments TXB010x family of parts: TXB0102 has 2 channels, TXB0104 has 4 channels, and TXB0108 has 8 channels.

The stand-out feature of this family of ICs is that signal direction is automatically sensed, so a separate direction setting pin is not needed.

Switching speeds up to 10 MHz work reliably. The theoretical maximum speed may be higher - the datasheets are not explicit about this from what I can determine.

I have a TXB0108 working between a 3.6 Volt MSP430 Launchpad and a 5 Volt Arduino Nano, so the use case of the question is covered.

For the purposes of trying it out, Adafruit offers a prebuilt module incorporating the TXB0108, which saves you the trouble of soldering an SMD part. There may be similar options for the 0102 and 0104 from them or others.

If the intent is to level-shift an I2C signal, which isn't ideally suited to the TXB series ICs, an option that specifically addresses the pull-up resistor and open collector topology of I2C is a module like this, again sold by Adafruit and other vendors.

This module uses BSS138 MOSFETs in the way described in the answer by alexan_e. While it is not a single IC such as the question asks for, it perhaps fulfills the intended purpose. Alternatively, it is simple to build this circuit yourself using MOSFETs.

Since the question seems oriented towards an IC that provides bidirectional level shifting, consider the Texas Instruments TXB010x family of parts: TXB0102 has 2 channels, TXB0104 has 4 channels, and TXB0108 has 8 channels.

The stand-out feature of this family of ICs is that signal direction is automatically sensed, so a separate direction setting pin is not needed.

Switching speeds up to 10 MHz work reliably. The theoretical maximum speed may be higher - the datasheets are not explicit about this from what I can determine.

I have a TXB0108 working between a 3.6 Volt MSP430 Launchpad and a 5 Volt Arduino Nano, so the use case of the question is covered.

For the purposes of trying it out, Adafruit offers a prebuilt module incorporating the TXB0108, which saves you the trouble of soldering an SMD part. There may be similar options for the 0102 and 0104 from them or others.

If the intent is to level-shift an I2C signal, which isn't ideally suited to the TXB series ICs, an option that specifically addresses the pull-up resistor and open collector topology of I2C is a module like this, again sold by Adafruit and other vendors.

This module uses BSS138 MOSFETs in the way described in the answer by alexan_e. While it is not a single IC such as the question asks for, it perhaps fulfills the intended purpose. Alternatively, it is simple to build this circuit yourself using MOSFETs.

Since the question seems oriented towards an IC that provides bidirectional level shifting, consider the Texas Instruments TXB010x family of parts: TXB0102 has 2 channels, TXB0104 has 4 channels, and TXB0108 has 8 channels.

The stand-out feature of this family of ICs is that signal direction is automatically sensed, so a separate direction setting pin is not needed.

Switching speeds up to 10 MHz work reliably. The theoretical maximum speed may be higher - the datasheets are not explicit about this from what I can determine.

I have a TXB0108 working between a 3.6 Volt MSP430 Launchpad and a 5 Volt Arduino Nano, so the use case of the question is covered.

For the purposes of trying it out, Adafruit offers a prebuilt module incorporating the TXB0108, which saves you the trouble of soldering an SMD part. There may be similar options for the 0102 and 0104 from them or others.

If the intent is to level-shift an I2C signal, which isn't ideally suited to the TXB series ICs, an option that specifically addresses the pull-up resistor and open collector topology of I2C is a module like this, again sold by Adafruit and other vendors.

This module uses BSS138 MOSFETs in the way described in the answer by alexan_e. While it is not a single IC such as the question asks for, it perhaps fulfills the intended purpose. Alternatively, it is simple to build this circuit yourself using MOSFETs.

Since the question seems oriented towards an IC that provides bidirectional level shifting, consider the Texas Instruments TXB010x family of parts: TXB0102 has 2 channels, TXB0104 has 4 channels, and TXB0108 has 8 channels.

The stand-out feature of this family of ICs is that signal direction is automatically sensed, so a separate direction setting pin is not needed.

Switching speeds up to 10 MHz work reliably. The theoretical maximum speed may be higher - the datasheets are not explicit about this from what I can determine.

I have a TXB0108 working between a 3.6 Volt MSP430 Launchpad and a 5 Volt Arduino Nano, so the use case of the question is covered.

For the purposes of trying it out, Adafruit offers a prebuilt module incorporating the TXB0108, which saves you the trouble of soldering an SMD part. There may be similar options for the 0102 and 0104 from them or others.

If the intent is to level-shift an I2C signal, which isn't ideally suited to the TXB series ICs, an option that specifically addresses the pull-up resistor and open collector topology of I2C is a module like this, again sold by Adafruit and other vendors.

This module uses BSS138 MOSFETs in the way described in the answer by alexan_e. While it is not a single IC such as the question asks for, it perhaps fulfills the intended purpose. Alternatively, it is simple to build this circuit yourself using MOSFETs.