Specifications
| Type | Description |
|---|---|
| Part Number | PCA9306 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | SSOP-8 2.95 mm x 4 mm; VSSOP-8 2.3 mm x 3.1 mm; X2SON-8 1.4 mm x 1 mm; DSBGA-8 1.98 mm x 0.98 mm |
| Interface Function | Dual bidirectional I2C and SMBus voltage-level translator; condition: SDA and SCL lines |
| Channel Count | 2-bit; condition: bidirectional translator for SDA and SCL lines |
| Supported Interfaces | I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces; condition: application interfaces |
| Propagation Delay | < 1.5 ns maximum; condition: standard-mode and fast-mode I2C applications |
| VREF1 Operating Range | 1.2 V to 3.3 V; condition: device operational range stated in description |
| VREF2 Operating Range | 1.8 V to 5.5 V; condition: device operational range stated in description |
| Voltage Translation Range | 1.2 V to 5 V; condition: bidirectional voltage translation without direction pin |
| Supported Translation Pair | 1.2-V VREF1 to 1.8-V, 2.5-V, 3.3-V, or 5-V VREF2; condition: voltage-level translation capability |
| Supported Translation Pair | 1.8-V VREF1 to 2.5-V, 3.3-V, or 5-V VREF2; condition: voltage-level translation capability |
| Supported Translation Pair | 2.5-V VREF1 to 3.3-V or 5-V VREF2; condition: voltage-level translation capability |
| Supported Translation Pair | 3.3-V VREF1 to 5-V VREF2; condition: voltage-level translation capability |
| Direction Control | No direction pin required; condition: bidirectional voltage translation |
| ON-State Resistance | 3.5 ohm low ON-state resistance; condition: between input and output ports |
| I/O Port Type | Open-drain I2C I/O ports; condition: SCL1, SDA1, SCL2, SDA2 |
| I/O Voltage Tolerance | 5 V tolerant; condition: I2C I/O ports for mixed-mode signal operation |
| Disable State | High impedance; condition: SCL1, SDA1, SCL2, SDA2 pins when EN = low |
| Isolation Feature | Lockup-free operation; condition: isolation when EN = low |
| Bus Isolation Use Case | Can isolate 400-kHz bus from 100-kHz bus; condition: EN pin disconnects slower bus during fast-mode communication |
| Latch-Up Performance | > 100 mA; condition: per JESD 78, class II |
| Human Body Model ESD Protection | 2000 V; condition: JESD 22 / ANSI/ESDA/JEDEC JS-001, all pins |
| Charged Device Model ESD Protection | 1000 V; condition: JESD 22 / ANSI/ESDA/JEDEC JS-0011, all pins |
| Pin EN | Switch enable input; condition: pin 8 on DCT/DCU/YZT, pin A2 on DQE |
| Pin GND | Ground, 0 V; condition: pin 1 on DCT/DCU/YZT, pin A1 on DQE |
| Pin SCL1 | Serial clock, low-voltage side; condition: pin 3 on DCT/DCU/YZT, pin C1 on DQE |
| Pin SCL2 | Serial clock, high-voltage side; condition: pin 6 on DCT/DCU/YZT, pin C2 on DQE |
| Pin SDA1 | Serial data, low-voltage side; condition: pin 4 on DCT/DCU/YZT, pin D1 on DQE |
| Pin SDA2 | Serial data, high-voltage side; condition: pin 5 on DCT/DCU/YZT, pin D2 on DQE |
| Pin VREF1 | Low-voltage-side reference supply voltage; condition: for SCL1 and SDA1; pin 2 on DCT/DCU/YZT, pin B1 on DQE |
| Pin VREF2 | High-voltage-side reference supply voltage; condition: for SCL2 and SDA2; pin 7 on DCT/DCU/YZT, pin B2 on DQE |
| Absolute Maximum VREF1 | -0.5 V to 7 V; condition: DC reference voltage range over operating ambient temperature range |
| Absolute Maximum VREF2 | -0.5 V to 7 V; condition: DC reference bias voltage range over operating ambient temperature range |
| Absolute Maximum Input Voltage | -0.5 V to 7 V; condition: input voltage range; negative rating may be exceeded if current ratings are observed |
| Absolute Maximum I/O Voltage | -0.5 V to 7 V; condition: input/output voltage range; negative rating may be exceeded if current ratings are observed |
| Absolute Maximum Continuous Channel Current | 128 mA; condition: continuous channel current |
| Input Clamp Current | -50 mA; condition: VI < 0 |
| Maximum Junction Temperature | 125 °C; condition: absolute maximum rating |
| Storage Temperature Range | -65 °C to 150 °C; condition: absolute maximum rating |
| Recommended I/O Voltage | 0 V to 5.5 V; condition: SCL1, SDA1, SCL2, SDA2 |
| Recommended VREF1 | 0 V to 5.5 V; condition: reference voltage; for translation VREF1 supports 1.2 V to VREF2 - 0.6 V |
| Recommended VREF2 | 0 V to 5.5 V; condition: reference voltage; for translation VREF2 must be between VREF1 + 0.6 V and 5.5 V |
| Recommended EN Voltage | 0 V to 5.5 V; condition: enable input voltage |
| Recommended Pass Switch Current | 64 mA; condition: IPASS |
| Operating Ambient Temperature | -40 °C to 85 °C; condition: recommended operating condition |
| Junction-to-Ambient Thermal Resistance | 254.1 °C/W; condition: DCT package, 8 pins |
| Junction-to-Ambient Thermal Resistance | 275.5 °C/W; condition: DCU package, 8 pins |
| Junction-to-Ambient Thermal Resistance | 299.3 °C/W; condition: DQE package, 8 pins |
| Junction-to-Ambient Thermal Resistance | 125.5 °C/W; condition: YZT package, 8 pins |
| Junction-to-Case Top Thermal Resistance | 148.6 °C/W; condition: DCT package, 8 pins |
| Junction-to-Case Top Thermal Resistance | 127.1 °C/W; condition: DCU package, 8 pins |
| Junction-to-Case Top Thermal Resistance | 166.9 °C/W; condition: DQE package, 8 pins |
| Junction-to-Case Top Thermal Resistance | 1 °C/W; condition: YZT package, 8 pins |
| Junction-to-Board Thermal Resistance | 168.8 °C/W; condition: DCT package, 8 pins |
| Junction-to-Board Thermal Resistance | 186.9 °C/W; condition: DCU package, 8 pins |
| Junction-to-Board Thermal Resistance | 188.30 °C/W; condition: DQE package, 8 pins |
| Junction-to-Board Thermal Resistance | 62.7 °C/W; condition: YZT package, 8 pins |
| Datasheet Status | request_only |
Product Overview
The PCA9306 is a Texas Instruments dual bidirectional I2C and SMBus voltage-level translator for SDA and SCL lines. It provides 2-bit bidirectional translation for open-drain I2C I/O ports, with no direction pin required for bidirectional voltage translation. Supported interfaces include I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces.
The device supports voltage translation from 1.2 V to 5 V. VREF1 operates from 1.2 V to 3.3 V, while VREF2 operates from 1.8 V to 5.5 V. Supported translation pairs include 1.2 V to 1.8 V, 2.5 V, 3.3 V, or 5 V; 1.8 V to 2.5 V, 3.3 V, or 5 V; 2.5 V to 3.3 V or 5 V; and 3.3 V to 5 V.
For bus behavior, the PCA9306 specifies less than 1.5 ns maximum propagation delay in standard-mode and fast-mode I2C applications. The EN pin can place SCL1, SDA1, SCL2, and SDA2 in high impedance, supporting lockup-free isolation and allowing a 400-kHz bus to be isolated from a 100-kHz bus. Package options include SSOP-8, VSSOP-8, X2SON-8, and DSBGA-8.
Key Features
- Dual bidirectional translator for SDA and SCL lines
- Supports I2C, SMBus, PMBus, MDIO, UART, SDIO, GPIO
- 1.2 V to 5 V bidirectional voltage translation
- No direction pin required for bidirectional operation
- Less than 1.5 ns maximum propagation delay
- 3.5 ohm low ON-state resistance
- 5 V tolerant open-drain I2C I/O ports
- High-impedance I/O pins when EN is low
- Lockup-free isolation when EN is low
- Can isolate 400-kHz bus from 100-kHz bus
Typical Applications
- I2C voltage translation
- SMBus voltage translation
- PMBus two-signal interfaces
- MDIO level translation
- UART signal translation
- Low-speed SDIO interfaces
- GPIO level translation
- 400-kHz to 100-kHz bus isolation
Procurement Notes
When requesting a quote for PCA9306, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What interface function does the PCA9306 provide?
The PCA9306 provides dual bidirectional I2C and SMBus voltage-level translation for SDA and SCL lines. It is a 2-bit bidirectional translator and also supports PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces.
What voltage translation range is supported by PCA9306?
The PCA9306 supports bidirectional voltage translation from 1.2 V to 5 V without a direction pin. VREF1 operates from 1.2 V to 3.3 V, and VREF2 operates from 1.8 V to 5.5 V.
What happens when the EN input is low?
When EN is low, the SCL1, SDA1, SCL2, and SDA2 pins are in a high-impedance state. The extracted datasheet facts also specify lockup-free isolation and a use case isolating a 400-kHz bus from a 100-kHz bus.
What package options are listed for PCA9306?
The listed package options are SSOP-8 measuring 2.95 mm x 4 mm, VSSOP-8 measuring 2.3 mm x 3.1 mm, X2SON-8 measuring 1.4 mm x 1 mm, and DSBGA-8 measuring 1.98 mm x 0.98 mm.
What are the recommended operating conditions for PCA9306?
Recommended conditions include 0 V to 5.5 V for SCL1, SDA1, SCL2, SDA2, VREF1, VREF2, and EN. For translation, VREF1 supports 1.2 V to VREF2 minus 0.6 V, while VREF2 must be between VREF1 plus 0.6 V and 5.5 V.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 7, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.