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NXP Semiconductors PCA9306GM,125
- Part No.:
- PCA9306GM,125
- Manufacturer:
- NXP Semiconductors
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PCA9306GM,125.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8XQFNU
- Quantity:
- Payment:
- Shipping:
Inventory:27,238
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Product details
Overview
PCA9306GM,125 from NXP Semiconductors is a dual bidirectional I²C-bus and SMBus voltage-level translator in XQFN8 package (1.6 × 1.6 × 0.5 mm), supporting 1.0 V to 3.6 V on VREF1 and 1.8 V to 5.5 V on VREF2, with <1.75 ns propagation delay (CL = 15 pF) and 3.5 Ω typical ON-state resistance. It enables seamless level translation between mixed-voltage I²C subsystems - e.g., 1.8 V microcontroller interfacing with 3.3 V sensor - without direction control.
For engineers reviewing the PCA9306GM,125 datasheet, PCA9306GM,125 pinout, PCA9306GM,125 application, or PCA9306GM,125 equivalent, this page delivers verified electrical parameters, validated XQFN8 pin mapping, real-world I²C bus frequency constraints (up to >2 MHz under low-capacitance conditions), and confirmed alternative parts for supply continuity and design flexibility.
Technical Context
The PCA9306GM,125 implements a passive FET-based bidirectional clamping architecture with two independent translation channels (SCL1↔SCL2 and SDA1↔SDA2), each featuring symmetrical Ron and matched propagation delay across voltage domains. Its EN input controls conduction state without affecting signal integrity - when HIGH (≥VREF2 −1 V), it establishes low-impedance paths; when LOW, it isolates ports into high-impedance mode.
Unlike active bus buffers (e.g., PCA9517A), the PCA9306GM,125 does not isolate bus capacitance during operation - capacitance from both sides couples when enabled. It supports Standard-mode (100 kHz), Fast-mode (400 kHz), and Fast-mode Plus (1 MHz) I²C, with maximum system frequency dependent on total node capacitance and pull-up resistor selection per side.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 1.0 V to 3.6 V - sets low-voltage domain logic levels for SCL1/SDA1; must be ≥1 V lower than VREF2 for reliable clamping. |
| VREF2 Range | 1.8 V to 5.5 V - powers high-voltage domain and EN input; defines SCL2/SDA2 logic HIGH and enables translator operation. |
| Propagation Delay | ≤1.75 ns (tPLH/tPHL, CL = 15 pF, translating up) - ensures timing compliance with Fast-mode Plus I²C at ≤1 MHz under optimized layout. |
| ON-State Resistance | Typ. 3.5 Ω (VI(EN) = 4.5 V) - minimizes voltage drop and signal distortion during bidirectional data transfer between voltage domains. |
| ESD Protection | ≥2000 V HBM (JESD22-A114), ≥1000 V CDM (JESD22-C101) - protects downstream 1.0–1.8 V logic from ESD events on 3.3/5 V bus lines. |
| Operating Temperature | −40 °C to +105 °C - qualified for industrial and automotive-adjacent embedded applications with extended thermal margins. |
| Supply Current (Iref) | Typ. 5 μA - ultra-low quiescent current enables use in always-on I²C monitoring paths without significant power penalty. |
Pinout & Package
XQFN8 package (SOT902-2): 1.6 mm × 1.6 mm × 0.5 mm body, no leads, wettable flank terminals, pin 1 index marked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return path for both voltage domains; must be low-inductance connection to minimize noise coupling. |
| EN | Enable control input | Active-HIGH switch control; requires pull-up to VREF2 (min. 200 kΩ) and must exceed VREF1 + 0.6 V for reliable turn-on. |
| VREF1 | Low-side reference supply | Defines logic thresholds for SCL1/SDA1; connects directly to 1.0–3.6 V core rail of low-voltage controller or peripheral. |
| SCL1 | Low-voltage serial clock | Open-drain I²C clock line referenced to VREF1; requires external pull-up resistor to VREF1. |
| SDA1 | Low-voltage serial data | Open-drain I²C data line referenced to VREF1; shares same pull-up requirement as SCL1. |
| SDA2 | High-voltage serial data | Open-drain I²C data line referenced to VREF2; requires separate pull-up resistor to VREF2 (not shared with SCL2). |
| SCL2 | High-voltage serial clock | Open-drain I²C clock line referenced to VREF2; requires dedicated pull-up resistor to VREF2. |
| VREF2 | High-side reference supply | Defines logic thresholds for SCL2/SDA2 and powers EN; must be ≥VREF1 + 1 V for optimal clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional translation without direction pin | Eliminates GPIO overhead and timing-critical direction control logic in microcontroller firmware or FPGA configuration. |
| Flow-through pinout (XQFN8) | Enables straight PCB trace routing between SCL1→SCL2 and SDA1→SDA2, minimizing stub length and signal integrity degradation. |
| 5 V tolerant I/O ports | Allows direct interface with legacy 5 V peripherals while protecting 1.0–1.8 V logic from overvoltage stress during hot-swap or fault conditions. |
| Lock-up free operation | Guarantees no latch-up or destructive current flow during voltage sequencing mismatches (e.g., VREF1 powered before VREF2). |
| Matched channel characteristics | Ensures identical propagation delay and voltage threshold behavior between SCL and SDA channels, simplifying I²C timing margin analysis. |
Applications
| Industrial Sensor Hub | Automotive Body Control Module |
|---|---|
|
Use Scenario: A 1.8 V ARM Cortex-M4 MCU communicates via I²C with multiple 3.3 V environmental sensors (temperature, humidity, pressure) and a 5 V EEPROM in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Voltage-level translator enabling bidirectional SCL/SDA signal translation between mismatched supply domains while preserving I²C timing budgets. Use Value: Eliminates need for discrete MOSFET translators or level-shifting buffers, reducing BOM count and PCB area by >40% versus discrete solutions. |
Use Scenario: A 3.3 V infotainment SoC interfaces with legacy 5 V CAN transceiver diagnostics port and 1.2 V battery management IC over shared I²C bus in vehicle gateway unit. IC Role / Device Role / Timing Role: Dual-channel translator providing isolated voltage domains for mixed-supply I²C peripherals without compromising Fast-mode timing. Use Value: Supports concurrent 400 kHz operation on both sides by decoupling capacitance during EN=LOW, enabling selective bus partitioning. |
| Wearable Health Monitor | Server Management Controller |
|
Use Scenario: Ultra-low-power 1.0 V RISC-V sensor hub reads data from 1.8 V optical heart-rate sensor and writes calibration data to 3.3 V flash memory over single I²C bus. IC Role / Device Role / Timing Role: Enables sub-1.2 V operation on VREF1 side while maintaining robust 3.3 V communication integrity on VREF2 side. Use Value: 5 μA reference current and 3.5 Ω Ron minimize voltage droop and power loss, extending battery life in always-on wearable applications. |
Use Scenario: A 1.2 V BMC (Baseboard Management Controller) monitors 3.3 V power rails and 5 V fan controllers using I²C PMBus-compatible devices in enterprise server rack. IC Role / Device Role / Timing Role: Provides galvanically isolated voltage translation (when disabled) and low-distortion signal coupling (when enabled) for multi-rail telemetry. Use Value: High-impedance isolation during EN=LOW prevents backfeeding between BMC and higher-voltage subsystems during reset or fault recovery. |
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 XQFN8 footprint (SOT902-2); same 1.6 × 1.6 mm body, 0.5 mm height, and terminal layout. | No functional difference; TI version uses different marking ("P06") and packaging tape specifications (7" reel Q3/T4). | Select PCA9306DCU only if TI sourcing preference or dual-sourcing strategy requires second-source qualification. |
| NXP PCA9306DP1,125 | TSSOP8 package (3 mm width, 0.65 mm pitch); 200 µm taller (1.1 mm max height); 1.2× larger PCB footprint; identical internal silicon and spec limits. | Preferred where hand-soldering, visual inspection, or thermal relief via exposed pad is required; less suitable for space-constrained wearables. | Choose PCA9306DP1,125 when board assembly process favors TSSOP over XQFN, or when thermal dissipation margin exceeds 150 mW. |
Compared with PCA9306GM,125, the PCA9306DCU offers identical performance in a functionally interchangeable package, while the PCA9306DP1,125 trades miniaturization for assembly flexibility and thermal headroom - making the GM variant optimal for ultra-dense portable electronics where size and profile are critical.
Availability
PCA9306GM,125 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive body control modules, wearable health monitors, and server management controllers requiring stable component supply across extended temperature ranges and mixed-voltage I²C interoperability.
Supply support for PCA9306GM,125 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 focused on secure connectivity solutions for automotive, industrial, IoT, mobile, and communication infrastructure markets.
The PCA9306GM,125 belongs to NXP's I²C interface portfolio, engineered specifically for robust, low-latency voltage translation in resource-constrained embedded systems where power efficiency, small form factor, and mixed-supply interoperability are critical.
FAQ
What is the minimum voltage difference required between VREF1 and VREF2 for reliable operation of the PCA9306GM,125?
The PCA9306GM,125 requires VREF2 ≥ VREF1 + 1 V for optimal clamping performance and guaranteed bidirectional translation. This margin ensures the internal pass transistor remains fully enhanced during voltage transitions. Operating below this threshold may result in incomplete level shifting or increased propagation delay - for example, pairing 1.8 V VREF1 with 2.5 V VREF2 meets the requirement, but 1.8 V with 2.3 V does not. The PCA9306GM,125 datasheet specifies this as a recommended operating condition, not an absolute limit.
Can the PCA9306GM,125 support I²C Fast-mode Plus (1 MHz) operation, and what design factors affect its maximum usable frequency?
Yes, the PCA9306GM,125 supports >2 MHz theoretical bandwidth under ideal low-capacitance conditions (CL ≤ 15 pF), but practical Fast-mode Plus (1 MHz) operation depends on total node capacitance, pull-up resistor values, and driver strength. Key limiting factors include combined bus capacitance (PCB traces + device inputs), rise/fall time governed by RC time constant, and the 1.75 ns tPLH/tPHL delay. To achieve 1 MHz, keep total capacitance ≤30 pF and use ≤2.2 kΩ pull-ups on both sides - the PCA9306GM,125 itself contributes only ~9.3 pF (on-state) to the signal path.
Is the EN pin of the PCA9306GM,125 5 V tolerant, and how should it be driven?
The EN pin of the PCA9306GM,125 is not 5 V tolerant as a standalone input - it must be referenced to VREF2 and pulled up to VREF2 (not to a separate 5 V rail). The datasheet specifies VI(EN) max = 5 V, but operation requires VI(EN) ≥ VREF1 + 0.6 V and ≤ VREF2. For a 5 V VREF2 system, EN is safely driven by that same 5 V supply via a 200 kΩ resistor; for 3.3 V VREF2, EN must be pulled to 3.3 V. Driving EN from a 5 V logic source while VREF2 = 3.3 V violates the VI(EN) ≤ VREF2 constraint and risks latch-up.
Does the PCA9306GM,125 provide bus capacitance isolation between the low- and high-voltage sides when enabled?
No - unlike active bus buffers (e.g., PCA9517A), the PCA9306GM,125 does not isolate bus capacitance when enabled. When EN = HIGH, the internal FETs create low-impedance paths, coupling the capacitance of both sides (SCL1+SDA1 and SCL2+SDA2) into a single effective node. This increases total bus capacitance and reduces maximum achievable frequency. Capacitance isolation occurs only when EN = LOW, placing all I/O pins in high-impedance state. System designers must account for combined capacitance in timing calculations.
What is the maximum continuous current rating per channel for the PCA9306GM,125, and how does it scale with voltage?
The PCA9306GM,125 supports up to 64 mA DC pass switch current (Isw(pass)) per channel (SCL or SDA) under recommended operating conditions. This rating is voltage-independent within the VREF1/VREF2 range but degrades with temperature - derating begins above +85 °C ambient. At 25 °C, the ON-state resistance is 3.5 Ω typ., yielding <225 mV drop at 64 mA. Exceeding 64 mA risks thermal overstress and parametric shift; the absolute maximum channel current is 128 mA, but sustained operation above 64 mA is not recommended per NXP's reliability guidelines for the PCA9306GM,125.
PCA9306GM,125 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-XFQFN Exposed Pad
PCA9306GM,125 FAQ
1.How can I place an order for PCA9306GM,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9306GM,125 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 PCA9306GM,125 reliable?
The price and inventory of PCA9306GM,125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9306GM,125 is usually 5 days.
3.What payment methods are accepted for PCA9306GM,125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9306GM,125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9306GM,125?
PCA9306GM,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9306GM,125 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 PCA9306GM,125?
For technical support, including PCA9306GM,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9306GM,125 requirements.
6.How does Aetrix verify that PCA9306GM,125 is sourced from the original manufacturer or authorized distributors?
All PCA9306GM,125 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 PCA9306GM,125 meets industry standards.
7.What is the process for return or replacement of PCA9306GM,125?
All PCA9306GM,125 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9306GM,125, 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 PCA9306GM,125 part is unused and in its original packaging.
Return procedure for PCA9306GM,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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