Analog Devices Inc. LTC4310IDD-1#TRPBF

Overview

LTC4310IDD-1#TRPBF from Analog Devices (formerly Linear Technology) is a bidirectional, 100kHz I²C isolator IC designed to enable reliable communication across galvanically isolated I²C buses. It features transformer- or capacitor-based isolation up to 1500V, integrated rise time accelerators (6mA typical), ±5kV HBM ESD protection, and automatic stuck-bus recovery (37ms timeout). It is used in isolated power supply monitoring, hot-swappable server modules, and industrial SMBus interfaces where ground separation is critical.

For engineers reviewing the LTC4310IDD-1#TRPBF datasheet, LTC4310IDD-1#TRPBF pinout, LTC4310IDD-1#TRPBF application, or LTC4310IDD-1#TRPBF equivalent, this page delivers verified electrical parameters, thermal shutdown behavior, EN-controlled low-power mode (0.1µA shutdown current), and precise timing specs including tPHL = 270ns max and fSCL(MAX) = 100kHz - all confirmed for the -1 variant in the DFN package at –40°C to +85°C.

Technical Context

The LTC4310IDD-1#TRPBF implements event-driven differential pulse transmission over TXP/TXN and RXP/RXN, with logic state encoding/decoding across an isolation barrier. Its rise rate limiter enforces dV/dtRISE = 0.8–1.4 V/µs (VCC = 3V–5.5V), while the rise time accelerator activates above 0.45•VCC to deliver up to 6mA pull-up current.

It supports full I²C protocol transparency - including clock stretching, arbitration, and STOP-bit detection - with simultaneous bus idle monitoring on both sides. READY output asserts low only after synchronized STOP/idle detection (tIDLE = 75–155µs), and thermal shutdown triggers at 150°C (recovery at 130°C).

Key Specifications

Pinout & Package

10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11), rated θJA = 43°C/W. GND-connected exposed pad improves thermal performance and EMI immunity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C isolation applications.

Compared with ISO1540DR and ADUM1250ARZ, the LTC4310IDD-1#TRPBF uniquely integrates I²C-aware features - including synchronized READY signaling, hardware-based stuck-bus recovery, and adaptive rise time acceleration - eliminating firmware dependencies and enabling true plug-and-play isolation in 100kHz systems.

Availability

LTC4310IDD-1#TRPBF is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and telecom infrastructure requiring stable component supply, extended temperature operation (–40°C to +85°C), and long-term lifecycle support.

Supply support for LTC4310IDD-1#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, Inc. (including legacy Linear Technology products) designs precision analog, mixed-signal, and power management ICs for high-reliability applications in industrial, automotive, and communications markets.

The LTC4310 product line delivers galvanically isolated I²C/SMBus interfaces with protocol-transparent operation, targeting systems where ground separation, hot-swap resilience, and autonomous bus recovery are mandatory - not just voltage isolation.

FAQ

What is the maximum I²C clock frequency supported by the LTC4310IDD-1#TRPBF?

The LTC4310IDD-1#TRPBF is specifically rated for 100kHz maximum SCL frequency, as confirmed in its Electrical Characteristics table (fSCL(MAX) = 100kHz). This distinguishes it from the LTC4310-2 variant (400kHz). Attempting 400kHz operation with LTC4310IDD-1#TRPBF violates specification and may cause timing violations or failed arbitration.

Does the LTC4310IDD-1#TRPBF require external pull-up resistors on SDA and SCL lines?

Yes, the LTC4310IDD-1#TRPBF requires external pull-up resistors on both SDA and SCL lines - typically 3.3kΩ to 7.5kΩ depending on bus capacitance and supply voltage. The device does not include internal pull-ups; its open-drain outputs rely on these external components to establish logic-high levels and meet I²C rise-time requirements.

How does the stuck-bus recovery feature work in the LTC4310IDD-1#TRPBF?

The LTC4310IDD-1#TRPBF monitors SDA and SCL simultaneously; if both remain low for 27–47ms (typical 37ms), it disables its drivers, transmits a recovery command across the isolation barrier, then issues up to 16 SCL clock pulses followed by a STOP bit. This hardware-based sequence resets slaves without host intervention - a key differentiator from generic digital isolators.

What isolation methods are supported by the LTC4310IDD-1#TRPBF?

The LTC4310IDD-1#TRPBF supports transformer-based isolation (e.g., EPF8119S for 1500V) and capacitor-coupled isolation. It drives TXP/TXN with 1.25V differential pulses and receives on RXP/RXN with 500mV noise rejection threshold. No optocouplers or dedicated isolation ICs are needed - only passive magnetics or ≥47pF ceramic capacitors.

What is the purpose of the READY pin on the LTC4310IDD-1#TRPBF?

The READY pin on the LTC4310IDD-1#TRPBF is an open-drain output that pulls low only after both local and remote I²C buses achieve synchronized idle or STOP conditions (tIDLE = 75–155µs). It signals to the host system that bidirectional communication is fully established and safe to initiate transactions - preventing premature access during startup or recovery.