Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Logic > Translators, Level Shifters

Texas Instruments TCA39306DTMR

Name: TCA39306DTMR
Brand: Texas Instruments
SKU: TCA39306DTMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: TCA39306DTMR

Manufacturer:: Texas Instruments

Category:: Translators, Level Shifters

Package:

Datasheet:: TCA39306DTMR.pdf

Description:: IC TRANSLTR BIDIRECTIONAL 8X2SON

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,552

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

TCA39306 from Texas Instruments is a dual bidirectional I²C/SMBus/I³C voltage-level translator IC enabling seamless communication between 0.85-V to 3.3-V and 1.8-V to 5.5-V domains without direction control pins; features <5.5 Ω typical R_ON, <46 ns max propagation delay, and 12.5 MHz I³C support; used in server backplane isolation and mixed-voltage industrial sensor interfaces.

For engineers reviewing the TCA39306 datasheet, TCA39306 pinout, TCA39306 application, or TCA39306 equivalent, key selection criteria include verified bidirectional translation across five VREF1/VREF2 voltage pairings, EN-controlled bus isolation for fast-mode plus (1 MHz) compatibility, and X2SON-8 package suitability for high-density PCB routing with flow-through pinout.

Technical Context

The TCA39306 implements two independent NFET-based pass-gate switches per channel (SCL/SDA), each controlled by an internal threshold-limited gate drive referenced to VREF1 and VREF2. Its architecture enables true bidirectional level shifting without external direction logic or pull-up resistor coordination across domains.

Operation relies on VREF1–VREF2 differential biasing through an external 200-kΩ resistor to establish EN voltage; the device supports three functional modes: translation (EN ≥ 1.5 V), high-impedance isolation (EN = 0 V), and switch mode (VREF1 = VREF2). Propagation delay asymmetry-faster low-to-high translation from low-voltage side-is inherent to its FET threshold-dependent conduction path.

Key Specifications

Parameter	Value and Actual Design Meaning
VREF1 Range	0.85 V to 3.3 V: sets low-side I/O reference; must be ≥0.6 V below VREF2 for reliable low-level translation
VREF2 Range	1.8 V to 5.5 V: sets high-side I/O reference; determines maximum supported bus voltage and EN enable threshold
R_ON (Typ)	3.5–7 Ω: ensures minimal signal distortion and <1% voltage drop at 64 mA, critical for maintaining I²C bus timing margins
Propagation Delay (Max)	46 ns @ CL=50 pF: guarantees compliance with Fast Mode Plus (1 MHz) timing budgets when both sides meet capacitance limits
I³C Support	12.5 MHz: enables use in next-generation I³C systems requiring higher bandwidth than legacy I²C Fast Mode Plus
ESD Rating	±2000 V HBM: meets JEDEC JESD22-A114 for robust handling in automated assembly and field-replaceable module environments
Operating Temp	–40 °C to +125 °C: supports deployment in industrial automation controllers and telecom switching equipment enclosures

Pinout & Package

Available in X2SON-8 (1.35 mm × 0.80 mm), VSSOP-8 (2.30 mm × 2.00 mm), and SOT-23-8 (2.90 mm × 1.60 mm) packages. X2SON-8 is the most common orderable variant for space-constrained applications.

Pin/Terminal	Circuit Role	Design Meaning
GND	Ground reference	Common return path for all internal circuitry; must be low-inductance connection to minimize noise coupling into sensitive I/O paths
EN	Enable control input	Logic-high (≥1.5 V) activates bidirectional switching; logic-low places all I/O pins in high-Z state for bus isolation
VREF1	Low-voltage domain supply	Bias reference for SCL1/SDA1; defines logic thresholds and drives internal gate control for low-side translation
VREF2	High-voltage domain supply	Bias reference for SCL2/SDA2; establishes EN voltage via external 200-kΩ resistor and sets high-side logic levels
SCL1 / SDA1	Low-voltage I²C bidirectional signals	Open-drain ports compatible with 0.85–3.3 V domains; require external pull-ups to VREF1
SCL2 / SDA2	High-voltage I²C bidirectional signals	5-V tolerant open-drain ports for 1.8–5.5 V domains; require external pull-ups to VREF2

Key Features

Feature	Design Value
No-direction-pin bidirectional translation	Eliminates need for GPIO-controlled direction logic or complex timing synchronization in mixed-voltage I²C topologies
Flow-through pinout (X2SON-8)	Enables straight trace routing between SCL1→SCL2 and SDA1→SDA2, reducing parasitic capacitance and crosstalk in high-speed layouts
EN-controlled bus isolation	Allows dynamic disconnection of slower peripherals during 1 MHz Fast Mode Plus bursts, preventing state-machine glitches in legacy devices
5-V tolerant I/O ports	Supports direct interfacing with 5-V microcontrollers or legacy SMBus peripherals without additional protection circuitry
Lockup-free operation at EN = Low	Guarantees deterministic high-impedance state on all four I/O pins, avoiding bus contention during hot-plug or power sequencing events

Applications

Server Backplane Interfacing	Industrial Sensor Hub Integration
Use Scenario: Connecting hot-pluggable compute modules with 1.8-V I²C sensors to a 3.3-V mainboard management controller. IC Role / Device Role / Timing Role: Voltage-level translator and EN-gated isolation switch ensuring glitch-free insertion while maintaining I²C clock stretching compatibility. Use Value: Prevents SCL line pulses during board mating; EN pin sequenced with module power-up avoids bus lockup and enables safe runtime reconfiguration.	Use Scenario: Aggregating 0.9-V MEMS accelerometers and 3.3-V environmental sensors onto a single 5-V MCU I²C bus. IC Role / Device Role / Timing Role: Dual-channel bidirectional level shifter supporting simultaneous translation across three distinct voltage domains (0.9 V, 3.3 V, 5 V). Use Value: Eliminates discrete MOSFET translators per sensor; R_ON < 7 Ω preserves rise/fall times required for 400 kHz Fast Mode operation across all channels.
Telecom Router Control Plane	PC Embedded Controller Interface
Use Scenario: Isolating legacy 3.3-V PMBus power monitors from a 1.2-V I³C-capable baseband processor in 5G radio units. IC Role / Device Role / Timing Role: I³C-aware voltage translator enabling 12.5 MHz control signaling while blocking backward compatibility issues with older PMBus slaves. Use Value: Allows migration to I³C without replacing entire power management subsystem; EN pin disables PMBus side during high-speed I³C bursts.	Use Scenario: Bridging 1.8-V EC (Embedded Controller) firmware update interface to 5-V system management hub in notebook platforms. IC Role / Device Role / Timing Role: Robust bidirectional translator with ±2000 V HBM ESD rating suitable for factory programming and field firmware recovery operations. Use Value: Withstands repeated USB-based EC flashing cycles; flow-through X2SON-8 layout minimizes trace length impact on 100 kHz Standard Mode timing.

Server Backplane Interfacing

Industrial Sensor Hub Integration

Use Scenario: Connecting hot-pluggable compute modules with 1.8-V I²C sensors to a 3.3-V mainboard management controller.

IC Role / Device Role / Timing Role: Voltage-level translator and EN-gated isolation switch ensuring glitch-free insertion while maintaining I²C clock stretching compatibility.

Use Value: Prevents SCL line pulses during board mating; EN pin sequenced with module power-up avoids bus lockup and enables safe runtime reconfiguration.

Use Scenario: Aggregating 0.9-V MEMS accelerometers and 3.3-V environmental sensors onto a single 5-V MCU I²C bus.

IC Role / Device Role / Timing Role: Dual-channel bidirectional level shifter supporting simultaneous translation across three distinct voltage domains (0.9 V, 3.3 V, 5 V).

Use Value: Eliminates discrete MOSFET translators per sensor; R_ON < 7 Ω preserves rise/fall times required for 400 kHz Fast Mode operation across all channels.

Telecom Router Control Plane

PC Embedded Controller Interface

Use Scenario: Isolating legacy 3.3-V PMBus power monitors from a 1.2-V I³C-capable baseband processor in 5G radio units.

IC Role / Device Role / Timing Role: I³C-aware voltage translator enabling 12.5 MHz control signaling while blocking backward compatibility issues with older PMBus slaves.

Use Value: Allows migration to I³C without replacing entire power management subsystem; EN pin disables PMBus side during high-speed I³C bursts.

Use Scenario: Bridging 1.8-V EC (Embedded Controller) firmware update interface to 5-V system management hub in notebook platforms.

IC Role / Device Role / Timing Role: Robust bidirectional translator with ±2000 V HBM ESD rating suitable for factory programming and field firmware recovery operations.

Use Value: Withstands repeated USB-based EC flashing cycles; flow-through X2SON-8 layout minimizes trace length impact on 100 kHz Standard Mode timing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-level translation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PCA9306DCUR	Single-supply design (V_REF only); no EN pin; R_ON ~10 Ω; supports up to 400 kHz only	Lacks bus isolation capability; unsuitable for mixed-speed I²C systems requiring EN-controlled disconnection	Select PCA9306DCUR only for cost-sensitive, static-voltage, non-isolated applications where 1 MHz or I³C support is unnecessary
TXS0102DCUR	Auto-direction sensing; no VREF2 pin; 5-V tolerant outputs only; R_ON ~15 Ω; no I³C support	Cannot translate from higher to lower voltage (e.g., 5 V → 1.8 V); lacks explicit EN control for deterministic isolation	Choose TXS0102DCUR for simple unidirectional or auto-sensing translation where VREF2 biasing complexity must be avoided

Compared with PCA9306DCUR and TXS0102DCUR, the TCA39306 uniquely delivers EN-gated isolation, 12.5 MHz I³C readiness, and sub-7 Ω R_ON across five validated VREF1/VREF2 pairings-making it the only option for dynamically reconfigurable, mixed-speed, multi-domain I²C infrastructure.

Availability

TCA39306 is available at Aetrix Electronics and suitable for server backplane interfacing, industrial sensor hub integration, telecom router control plane design, and PC embedded controller interface applications requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for TCA39306 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in interface, power management, and signal chain solutions for industrial, automotive, and communications markets.

The TCA39306 belongs to TI's precision voltage-level translation product line, engineered specifically for robust, high-speed interoperability between heterogeneous I²C, SMBus, and emerging I³C subsystems in mission-critical infrastructure.

FAQ

What voltage combinations does the TCA39306 officially support for bidirectional translation?

The TCA39306 supports five documented VREF1/VREF2 pairings: 0.9 V / 1.8–5 V; 1.2 V / 1.8–5 V; 1.8 V / 2.5–5 V; 2.5 V / 3.3–5 V; and 3.3 V / 5 V. Each pairing is validated per TI's SCPS274B datasheet Section 1, and translation outside these ranges-such as 0.85 V to 5.5 V-is specified as operational but not characterized for timing or R_ON performance.

How does the EN pin function in the TCA39306, and what voltage level enables translation?

The EN pin controls switch activation: logic-high (≥1.5 V) enables bidirectional conduction between SCL1↔SCL2 and SDA1↔SDA2; logic-low forces all four I/O pins into high-impedance state. EN voltage is internally derived from VREF2 via a 200-kΩ external resistor, so EN = VREF1 + V_TH (~0.6 V), making it self-biasing and eliminating need for separate GPIO control in many designs.

Can the TCA39306 be used for I³C applications, and what is its maximum supported frequency?

Yes-the TCA39306 is explicitly I³C-compatible and supports up to 12.5 MHz operation per Section 1 Features and Section 8.1.5 of the datasheet. This exceeds standard I²C Fast Mode Plus (1 MHz) and enables use in I³C Bus v1.1.1 systems requiring higher bandwidth for in-band interrupt or dynamic address allocation.

What is the significance of the 200-kΩ resistor between VREF2 and EN in the TCA39306 application circuit?

The 200-kΩ resistor establishes the EN bias voltage (VEN = VREF1 + V_TH) and limits current between VREF2 and VREF1. Per Section 8.1.8, sizing this resistor too low risks exceeding the 128 mA absolute maximum continuous channel current; increasing it reduces bias current but may degrade low-voltage translation margin if VREF1 is near 0.85 V.

Does the TCA39306 require external pull-up resistors on both sides of the I²C bus?

Yes-external pull-up resistors are mandatory on both SCL1/SDA1 (to VREF1) and SCL2/SDA2 (to VREF2). The TCA39306 contains no internal pull-ups; per Section 9.1.1, proper resistor sizing ensures bus rise time compliance with I²C timing specs, especially under worst-case 400 pF total capacitance (Standard/Fast Mode) or 550 pF (Fast Mode Plus).

TCA39306DTMR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:

Packaging:: Tape & Reel (TR)

Product Status:: Active

Translator Type:: Voltage Level

Channel Type:: Bidirectional

Number of Circuits:: 1

Channels per Circuit:: 2

Voltage - VCCA:: 0.85 V ~ 5.5 V

Voltage - VCCB:: 1.65 V ~ 5.5 V

Input Signal:: -

Output Signal:: -

Output Type:: Open Drain, Push-Pull

Data Rate:: -

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Features:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-XFDFN Exposed Pad

TCA39306DTMR FAQ

1.How can I place an order for TCA39306DTMR through Aetrix?

Please submit a Request for Quotation (RFQ) for TCA39306DTMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TCA39306DTMR reliable?

The price and inventory of TCA39306DTMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCA39306DTMR is usually 5 days.

3.What payment methods are accepted for TCA39306DTMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCA39306DTMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TCA39306DTMR?

TCA39306DTMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TCA39306DTMR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TCA39306DTMR?

For technical support, including TCA39306DTMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCA39306DTMR requirements.

6.How does Aetrix verify that TCA39306DTMR is sourced from the original manufacturer or authorized distributors?

All TCA39306DTMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TCA39306DTMR meets industry standards.

7.What is the process for return or replacement of TCA39306DTMR?

All TCA39306DTMR units undergo pre-shipment inspection (PSI). If there is an issue with TCA39306DTMR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TCA39306DTMR part is unused and in its original packaging.

Return procedure for TCA39306DTMR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…