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NXP Semiconductors PCA9306D,118
- Part No.:
- PCA9306D,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PCA9306D,118.pdf
- Description:
- IC TRANSLATOR BIDIRECTIONAL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:22,681
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Product details
Overview
The PCA9306D,118 from NXP Semiconductors is a dual bidirectional I²C-bus and SMBus voltage-level translator in SO8 package, supporting 1.0 V to 3.6 V (VREF1) and 1.8 V to 5.5 V (VREF2) domains, with <1.5 ns max propagation delay and 3.5 Ω typical ON-state resistance. It enables seamless level translation between mixed-voltage I²C subsystems-e.g., connecting a 1.8 V microcontroller to a 3.3 V sensor-without direction control.
For engineers reviewing the PCA9306D,118 datasheet, PCA9306D,118 pinout, PCA9306D,118 application, or PCA9306D,118 equivalent, key selection criteria include bidirectional operation without direction pin, EN-controlled isolation, flow-through pinout for PCB routing, 5 V-tolerant I/O, and compatibility with Standard-mode, Fast-mode, and Fast-mode Plus I²C buses up to >2 MHz.
Technical Context
The PCA9306D,118 implements a passive MOSFET-based clamping architecture with two independent bidirectional channels (SCL/SDA), each featuring symmetrical low-RON switches controlled by a single enable (EN) input referenced to VREF2. Its operation relies on voltage-dependent clamp conduction rather than active logic buffering.
Unlike bus buffers (e.g., PCA9517A), it provides no physical capacitance isolation between sides when enabled-only high-impedance isolation when EN = LOW. Translation directionality is determined dynamically by relative voltage levels at SDA1/SDA2 and SCL1/SCL2, requiring pull-up resistors on both sides and VREF2 ≥ VREF1 + 1 V for reliable switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 1.0 V to 3.6 V - sets low-voltage domain reference for SCL1/SDA1; determines maximum output voltage on low-side pins |
| VREF2 Range | 1.8 V to 5.5 V - sets high-voltage domain reference for SCL2/SDA2; must exceed VREF1 by ≥1 V for stable EN operation |
| Max Propagation Delay | <1.5 ns - ensures timing compliance with Fast-mode Plus (1 MHz) I²C systems even with 15 pF load |
| ON-State Resistance | 3.5 Ω typical - minimizes voltage drop and signal distortion during active translation |
| I²C Compatibility | Standard-mode (100 kHz), Fast-mode (400 kHz), Fast-mode Plus (1 MHz), SMBus - supports legacy and high-speed mixed-voltage nodes |
| ESD Protection | 2000 V HBM, 1000 V CDM - protects downstream 1.0–1.8 V logic from ESD events on 3.3/5 V bus side |
| Operating Temperature | −40 °C to +105 °C - qualified for industrial and automotive under-hood applications |
Pinout & Package
PCA9306D,118 is housed in an SO8 package (SOT96-1): plastic small outline, 8-lead, 3.9 mm body width, 1.27 mm pitch, with flow-through pinout optimized for minimal trace crossovers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return path for both voltage domains; must be low-impedance connection to system ground plane |
| VREF1 | Low-side supply reference | Bias source for SCL1/SDA1; defines logic HIGH threshold and clamping limit on low-voltage side |
| SCL1 | Low-side serial clock | Open-drain I²C clock line connected to VREF1 via external pull-up; bidirectionally translated to SCL2 |
| SDA1 | Low-side serial data | Open-drain I²C data line connected to VREF1 via external pull-up; bidirectionally translated to SDA2 |
| SDA2 | High-side serial data | Open-drain I²C data line connected to VREF2 via external pull-up; bidirectionally translated to SDA1 |
| SCL2 | High-side serial clock | Open-drain I²C clock line connected to VREF2 via external pull-up; bidirectionally translated to SCL1 |
| VREF2 | High-side supply reference | Bias source for SCL2/SDA2; powers internal clamp circuitry and sets EN threshold |
| EN | Enable control input | Active-HIGH logic input referenced to VREF2; must be pulled to VREF2 (≥1 V above VREF1) for translation |
Key Features
| Feature | Design Value |
|---|---|
| Dual bidirectional channel architecture | Independent SCL and SDA translation paths eliminate need for separate devices or complex routing |
| No direction pin required | Automatic voltage-sensing clamping enables true bidirectional data flow without external control signals |
| 5 V-tolerant I/O ports | SCL1/SDA1/SCL2/SDA2 withstand 5 V inputs while operating from 1.0 V VREF1, enabling direct interface to legacy 5 V peripherals |
| Flow-through pinout | Pins arranged 1–4 (GND, VREF1, SCL1, SDA1) and 5–8 (SDA2, SCL2, VREF2, EN) allow straight-line PCB trace routing across device |
| Lock-up free operation | Guaranteed immunity to latch-up under all valid voltage combinations and transient conditions per JEDEC JESD78 |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing a 1.8 V ARM Cortex-M4 microcontroller to 3.3 V temperature/humidity sensors and 5 V EEPROMs on same I²C bus. IC Role / Device Role / Timing Role: Voltage-level translator enabling mixed-supply I²C communication without bus segmentation or software workarounds. Use Value: Eliminates need for discrete FET translators or dual-bus controllers; maintains Fast-mode (400 kHz) throughput with <1.5 ns added delay. | Use Scenario: Connecting 1.2 V CAN controller MCU to 3.3 V LIN transceivers and 5 V lighting drivers in vehicle door module. IC Role / Device Role / Timing Role: Bidirectional level shifter isolating low-voltage logic from higher-voltage power-domain peripherals while preserving I²C timing integrity. Use Value: Enables EN-controlled bus partitioning during sleep mode; −40 °C to +105 °C rating meets AEC-Q100 Grade 2 requirements. |
| Server Baseboard Management | Medical Wearable Hub |
Use Scenario: Bridging 1.0 V FPGA I/O banks to 3.3 V thermal sensors, 5 V fan controllers, and SMBus-compliant PMBus power supplies in rack server BMC. IC Role / Device Role / Timing Role: Dual-channel translator supporting simultaneous SCL/SDA translation across multiple voltage domains in dense BOM-constrained designs. Use Value: SO8 package allows placement adjacent to FPGA BGA; 3.5 Ω RON prevents VOL degradation at 15 mA sink current. | Use Scenario: Linking ultra-low-power 1.5 V Bluetooth SoC to 3.3 V biometric sensors (ECG, SpO₂) and 5 V charging ICs in compact wearable patch. IC Role / Device Role / Timing Role: Low-leakage, high-ESD-transient-tolerant translator ensuring robust I²C communication in battery-operated, space-constrained medical devices. Use Value: 2000 V HBM protection safeguards sensitive analog front-end; EN pin enables dynamic bus power gating to extend battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C voltage-level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments PCA9306DCU | Identical pinout, electrical specs, and SO8-compatible VSSOP8 package; same 3.5 Ω RON, <1.5 ns delay, and −40 °C to +105 °C range | VSSOP8 footprint requires PCB redesign vs. SO8; slightly higher thermal resistance (θJA = 210 °C/W vs. 160 °C/W) | Select PCA9306DCU only if VSSOP8 density advantage outweighs thermal derating needs in high-ambient environments |
| NXP PCA9306DP,118 | Same die, TSSOP8 package (SOT505-1); identical VREF1/VREF2 ranges, propagation delay, and ESD ratings | TSSOP8 offers 3 mm body width vs. SO8's 3.9 mm-enables tighter layout in space-constrained modules | Choose PCA9306DP,118 when board area is critical and reflow profile supports thinner TSSOP8 standoff height |
Compared with PCA9306DCU and PCA9306DP,118, the PCA9306D,118 delivers identical translation performance in the industry-standard SO8 package, offering superior thermal dissipation and mechanical robustness for high-reliability industrial and automotive applications where board-level shock/vibration resistance matters.
Availability
PCA9306D,118 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and server baseboard management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCA9306D,118 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, IoT, mobile, and communication infrastructure markets.
The PCA9306D,118 belongs to NXP's I²C interface portfolio, engineered specifically to solve mixed-voltage interoperability challenges in resource-constrained embedded systems without compromising speed, reliability, or PCB real estate.
FAQ
What voltage ranges does the PCA9306D,118 support for level translation?
The PCA9306D,118 supports VREF1 from 1.0 V to 3.6 V (low-voltage side) and VREF2 from 1.8 V to 5.5 V (high-voltage side). For reliable operation, VREF2 must be at least 1 V higher than VREF1. Valid combinations include 1.8 V ↔ 3.3 V, 1.8 V ↔ 5 V, 2.5 V ↔ 5 V, and 3.3 V ↔ 5 V. The PCA9306D,118 does not support reverse translation where VREF1 exceeds VREF2.
Does the PCA9306D,118 require external pull-up resistors on both sides of the I²C bus?
Yes, the PCA9306D,118 requires external pull-up resistors on both the SCL1/SDA1 (low-voltage) and SCL2/SDA2 (high-voltage) sides. Each side must have its own pull-up network referenced to its respective VREF supply. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and target speed; the PCA9306D,118 datasheet provides minimum resistor tables for 3 mA, 10 mA, and 15 mA sink currents.
Can the PCA9306D,118 operate at Fast-mode Plus (1 MHz) I²C speeds?
Yes, the PCA9306D,118 supports Fast-mode Plus I²C operation up to >2 MHz under optimal conditions (low bus capacitance ≤30 pF, strong drive strength ≥10 mA, and properly sized pull-ups). Its <1.5 ns typical propagation delay and low 3.5 Ω ON-state resistance minimize timing degradation. System-level frequency is ultimately limited by RC time constant of the total bus node, not the PCA9306D,118 itself.
How does the EN pin function on the PCA9306D,118, and what voltage level is required?
The EN pin on the PCA9306D,118 is an active-HIGH enable input referenced to VREF2. When EN is HIGH (≥0.7 × VREF2), the internal switches conduct, enabling bidirectional translation. When EN is LOW (<0.3 × VREF2), both SCL and SDA channels enter high-impedance isolation. EN must be pulled to VREF2 through a resistor (typically 200 kΩ) and should be at least 1 V higher than VREF1 for stable operation.
Is the PCA9306D,118 pin-compatible with other packages in the PCA9306 family?
No, the PCA9306D,118 (SO8) is not pin-compatible with VSSOP8, TSSOP8, XQFN8, or XSON8 variants despite identical functionality. Pin numbering and physical dimensions differ across packages-e.g., SO8 uses SOT96-1 outline with 1.27 mm pitch, while TSSOP8 uses SOT505-1 with 0.65 mm pitch. PCB layout must be redesigned when changing packages; only the die and electrical behavior are consistent.
PCA9306D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- 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:
- 1 V ~ 3.6 V
- Voltage - VCCB:
- 1.8 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Open Drain
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC (0.154", 3.90mm Width)
PCA9306D,118 FAQ
1.How can I place an order for PCA9306D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9306D,118 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 PCA9306D,118 reliable?
The price and inventory of PCA9306D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9306D,118 is usually 5 days.
3.What payment methods are accepted for PCA9306D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9306D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9306D,118?
PCA9306D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9306D,118 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 PCA9306D,118?
For technical support, including PCA9306D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9306D,118 requirements.
6.How does Aetrix verify that PCA9306D,118 is sourced from the original manufacturer or authorized distributors?
All PCA9306D,118 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 PCA9306D,118 meets industry standards.
7.What is the process for return or replacement of PCA9306D,118?
All PCA9306D,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9306D,118, 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 PCA9306D,118 part is unused and in its original packaging.
Return procedure for PCA9306D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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