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Analog Devices Inc. LTC4331IUFD#TRPBF
- Part No.:
- LTC4331IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized ICs
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4331IUFD#TRPBF.pdf
- Description:
- IC DIFFERENTIAL LINK 20QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC4331IUFD#TRPBF from Analog Devices is an SMBus 3.0–compatible I2C slave device extender IC designed for industrial point-to-point differential extension of I2C/SMBus buses up to 1200m over a single twisted pair. It supports Fast-mode Plus (1MHz SCL), ±60V fault-protected differential transceiver (A/B pins), extended common mode range (±15V), and independent local/remote bus timing via SPEED1/SPEED2 configuration. It enables remote sensor node control in factory automation systems with ground potential differences.
For engineers reviewing the LTC4331IUFD#TRPBF datasheet, LTC4331IUFD#TRPBF pinout, LTC4331IUFD#TRPBF application, or LTC4331IUFD#TRPBF equivalent, key selection considerations include differential link baud rate configuration (SPEED1/SPEED2), REMOTE pin mode assignment (local vs. remote), SLO slew-rate control for EMI reduction, and support for SMBALERT propagation and clock-stretching–aware masters.
Technical Context
The LTC4331IUFD#TRPBF operates in two mutually exclusive modes: local (REMOTE = 0) as an I2C slave with configurable address (A1/A2), and remote (REMOTE = 1) as an I2C master replicating local transactions on the far end. Its internal RS485-compliant transceiver provides ±60V fault protection and ±15V common mode tolerance, enabling robust operation across large ground offsets.
Link timing is determined by SPEED1/SPEED2 pin states (9 selectable speed indices), with SLO pin enabling slew-rate limiting for EMI-sensitive deployments-valid only for Speed Index 0 or 1. The device implements full I2C protocol transparency including START/STOP propagation, ACK/NACK handling, and data buffering, requiring no firmware changes when integrated into existing I2C master stacks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 3V to 5.5V - powers core logic and driver circuitry; requires 4.7µF ceramic bypass to GND. |
| Logic Supply (VL) | 1.62V to 5.5V - independently powers I/O interface; supports mixed-voltage system integration. |
| SCL Frequency Support | Up to 1000kHz (Fm+) - local slave mode supports Fast-mode Plus; effective link throughput capped at 1000kHz regardless of higher local clock. |
| Differential Fault Protection | ±60V on A/B pins - prevents damage from line surges or ground loop transients in industrial cabling. |
| Common Mode Range | ±15V - tolerates large ground potential differences between local and remote nodes without communication loss. |
| ESD Rating (Link Pins) | ±40kV HBM - ensures reliability during handling and installation in unshielded environments. |
| Package | 20-lead 4mm × 5mm QFN - exposes thermal pad (Pin 21) for PCB soldering to enhance thermal dissipation in continuous operation. |
Pinout & Package
Package: 20-lead (4mm × 5mm) plastic QFN with exposed thermal pad (Pin 21 = GND). Requires soldering of exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (1) | Core supply input | 3V–5.5V main power; must be decoupled with 4.7µF ceramic capacitor to GND. |
| VL (2) | Logic I/O supply | 1.62V–5.5V reference for SCL/SDA/ALERT/CTRL; independent of VCC for voltage translation. |
| ON (3) | Enable control | Active-high enable; low disables outputs and forces internal reset for ultra-low-power standby (1µA typical). |
| REMOTE (4) | Mode select | Low = local I2C slave; high = remote I2C master; weakly pulled to GND internally. |
| LINK (5) | Open-drain status output | Drives low when differential link is established and I2C interface is ready; requires external pull-up to VL. |
| RDY (6) | I2C interface ready indicator | Drives low after I2C interface joins bus; valid only in local mode; weak internal pull-up to VL. |
| SCL (7) | I2C serial clock | Bi-directional open-drain I2C clock line; requires external pull-up; supports clock-stretching. |
| SDA (8) | I2C serial data | Bi-directional open-drain I2C data line; requires external pull-up; supports clock-stretching. |
| A1/A2 (11/12) | I2C slave address select | 3-state inputs defining one of eight possible local slave addresses; float to disable internal slave interface. |
| CTRL (13) | Control signal tunnel | Level-tolerant bidirectional control line propagated across differential link; weak pull-up to VL. |
| SPEED1/SPEED2 (14/15) | Link baud rate select | 3-state inputs selecting one of nine link speeds (Speed Index 0–8); determines max cable length and latency. |
| SLO (17) | Slew rate control | Active-low; reduces EMI emissions on A/B outputs; restricts valid SPEED1/SPEED2 combinations to Index 0 or 1. |
| A (18) | Differential non-inverting output | RS485-compliant transceiver output; ±60V fault protected; connects to twisted-pair A line. |
| B (19) | Differential inverting output | RS485-compliant transceiver output; ±60V fault protected; connects to twisted-pair B line. |
Key Features
| Feature | Design Value |
|---|---|
| I2C/SMBus protocol transparency | Zero firmware modification required on master side; supports clock-stretching, repeated START, and ACK/NACK handshaking. |
| Differential link configurability | 9 selectable baud rates via SPEED1/SPEED2 pins - balances cable length (up to 1200m) against latency and noise immunity. |
| EMI-reduced operation | SLO pin enables slew-rate limiting on A/B outputs - critical for compliance in EMC-sensitive lighting or medical equipment. |
| Robust fault resilience | ±60V line fault protection + ±40kV HBM ESD on A/B pins + IEC Level 4 EFT (±5kV) - suitable for harsh factory floor deployment. |
| Remote interrupt tunneling | ALERT pin propagates SMBALERT/INT signals bidirectionally across link - enables real-time remote sensor event notification. |
Applications
| Industrial Sensor Networks | Factory Automation Controllers |
|---|---|
Use Scenario: Distributed temperature, pressure, and flow sensors mounted across a 300m production line communicate via I2C to a central PLC. IC Role / Device Role / Timing Role: LTC4331IUFD#TRPBF acts as local slave extender at sensor node, converting local I2C reads into differential packets sent over CAT5 cable. Use Value: Eliminates need for isolated I2C repeaters or RS485-to-I2C gateways; maintains native I2C addressing and timing while tolerating >10V ground offset between cabinets. |
Use Scenario: PLC backplane uses I2C to configure remote I/O modules housed in electrically noisy motor control cabinets. IC Role / Device Role / Timing Role: LTC4331IUFD#TRPBF operates in remote master mode, mirroring PLC-initiated I2C writes onto local module buses. Use Value: Enables deterministic, low-jitter configuration updates despite 15V common-mode noise on cabinet interconnect cables. |
| Smart Lighting Control Systems | Building Management Systems (BMS) |
Use Scenario: LED driver boards in ceiling fixtures are daisy-chained over 100m twisted pair, each reporting thermal and current data via I2C. IC Role / Device Role / Timing Role: LTC4331IUFD#TRPBF serves as local slave on each driver board, aggregating sensor data and forwarding it upstream. Use Value: SLO-enabled low-slew operation meets Class B EMC requirements for commercial lighting; ±15V common mode handles HVAC-induced ground shifts. |
Use Scenario: HVAC controllers in separate mechanical rooms communicate setpoints and status to zone-level thermostats over legacy wiring. IC Role / Device Role / Timing Role: LTC4331IUFD#TRPBF bridges building-wide I2C management bus to isolated room-level networks using existing 2-wire infrastructure. Use Value: Replaces proprietary RS485 gateways with standardized I2C extension; supports SMBus ALERT for immediate fault reporting from chillers or AHUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I2C differential extension applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP PCA9615DP | Single-ended I2C buffer with integrated level-shifting; no differential transceiver or long-cable support; max 10m reach. | Designed for board-level voltage translation, not industrial cable extension; lacks ±60V fault protection and SMBALERT tunneling. | Select only for short-distance, multi-voltage I2C bus buffering where ground offset is negligible. |
| Texas Instruments TCA9517A | Bi-directional I2C repeater with 2-channel isolation; supports up to 400kHz; no differential signaling or remote master capability. | Intended for noise suppression across PCB splits or connectors-not for 1200m cable runs; no common mode tolerance beyond ±5V. | Choose for intra-chassis I2C segmentation where galvanic isolation suffices and cable length is <5m. |
Compared with PCA9615DP and TCA9517A, the LTC4331IUFD#TRPBF uniquely delivers true differential I2C extension over 1200m with ±60V fault protection, SMBALERT tunneling, and independent local/remote bus timing-making it the only option for ground-isolated, long-haul industrial I2C networks.
Availability
LTC4331IUFD#TRPBF is available at Aetrix Electronics and suitable for industrial sensor networks, factory automation controllers, smart lighting control systems, and building management systems requiring stable component supply across extended product lifecycles.
Supply support for LTC4331IUFD#TRPBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC4331IUFD#TRPBF belongs to Analog Devices' Signal Conditioning and Interface portfolio, specifically engineered to solve long-distance, noise-immune I2C extension challenges in harsh industrial environments.
FAQ
What is the maximum cable length supported by the LTC4331IUFD#TRPBF?
The LTC4331IUFD#TRPBF supports up to 1200m over a single twisted-pair cable when configured for the lowest link speed (Speed Index 0). Maximum length decreases with increasing SPEED1/SPEED2 index due to signal integrity constraints; for example, Speed Index 4 supports ~300m at 1MHz local SCL. Cable type (e.g., CAT5, shielded twisted pair) and noise environment directly impact achievable distance.
Does the LTC4331IUFD#TRPBF require a microcontroller to operate?
No, the LTC4331IUFD#TRPBF operates autonomously without firmware. In local mode, it functions as a transparent I2C slave; in remote mode, it acts as a hardware-based I2C master replicating local transactions. Configuration is handled entirely through pin strapping (SPEED1/SPEED2, REMOTE, SLO, A1/A2), and no host processor or code is needed for basic extension functionality.
How does the SLO pin affect link performance in the LTC4331IUFD#TRPBF?
The SLO pin on the LTC4331IUFD#TRPBF enables slew-rate limiting on the A/B differential outputs to reduce EMI emissions. When SLO = low, only Speed Index 0 or 1 configurations are valid; using higher indices (2–8) with SLO low causes link data corruption. This trade-off prioritizes EMC compliance over maximum cable speed or length.
Can multiple LTC4331IUFD#TRPBF devices share the same I2C bus?
Yes - up to eight LTC4331IUFD#TRPBF devices can coexist on the same local I2C bus by configuring unique slave addresses via A1 and A2 pins (each combination yields a distinct 7-bit address). All devices must use identical SPEED1/SPEED2 settings and share the same differential link partner configuration to maintain interoperability.
What is the operating temperature range for the LTC4331IUFD#TRPBF?
The LTC4331IUFD#TRPBF is rated for –40°C to +85°C ambient operating temperature, qualifying it for industrial-grade applications including factory floors, outdoor enclosures, and HVAC equipment. This rating is confirmed in the Absolute Maximum Ratings table and applies across all electrical specifications unless otherwise noted.
LTC4331IUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Differential Link
- Applications:
- Industrial, Lighting
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x5)
- Grade:
- -
- Qualification:
- -
LTC4331IUFD#TRPBF FAQ
1.How can I place an order for LTC4331IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4331IUFD#TRPBF 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 LTC4331IUFD#TRPBF reliable?
The price and inventory of LTC4331IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4331IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4331IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4331IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4331IUFD#TRPBF?
LTC4331IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4331IUFD#TRPBF 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 LTC4331IUFD#TRPBF?
For technical support, including LTC4331IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4331IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC4331IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4331IUFD#TRPBF 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 LTC4331IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4331IUFD#TRPBF?
All LTC4331IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4331IUFD#TRPBF, 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 LTC4331IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4331IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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