Analog Devices Inc. LTM2882IV-5#PBF

Overview

LTM2882IV-5#PBF from Analog Devices is a galvanically isolated dual RS232 µModule transceiver with integrated 5V isolated DC/DC converter (150mA output), 2500VRMS isolation, ±10kV HBM ESD protection on RS232 and isolation barrier pins, and 1.62V–5.5V logic supply (VL) independent of main VCC. It enables robust ground-loop-free serial communication in industrial test equipment and measurement systems.

For engineers reviewing the LTM2882IV-5#PBF datasheet, LTM2882IV-5#PBF pinout, LTM2882IV-5#PBF application, or LTM2882IV-5#PBF equivalent, key selection considerations include its dual-channel RS232 compliance, 100kbps–1Mbps data rate scalability per load, 30kV/μs common-mode transient immunity, and auxiliary isolated digital channel for half-duplex DE control.

Technical Context

The LTM2882IV-5#PBF implements coreless transformer-based µModule isolation to encode/decode signals across the barrier, supporting prioritized T1IN/R1IN channels (zero jitter) and lower-priority T2IN/R2IN/DIN channels (±6ns typical timing uncertainty). Its integrated full-bridge DC/DC converter operates at ~2MHz with internal 2.2µF bypassing and delivers regulated 5V at up to 150mA on VCC2.

It features dual independent RS232 transceivers compliant with TIA/EIA-232-F, each with true ±5.7V driver output swing, 5kΩ receiver input impedance, and short-circuit protection to ±15V. The auxiliary DIN→DOUT channel supports sub-2µs DE enable/disable for half-duplex operation without external logic.

Key Specifications

Pinout & Package

Package: 32-pin LGA (15mm × 11.25mm × 2.8mm), RoHS-compliant Au finish, MSL Level 3, rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated RS232 transceiver applications.

Compared with ADM2483BRWZ and ISO1540DR, the LTM2882IV-5#PBF uniquely integrates dual RS232 transceivers, 2500VRMS isolation, and 150mA isolated 5V power in one LGA package-reducing bill-of-materials, PCB area, and safety certification complexity for industrial serial interfaces.

Availability

LTM2882IV-5#PBF is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, test equipment, and energy metering applications requiring stable component supply, extended temperature support (–40°C to +85°C), and regulatory-compliant isolation.

Supply support for LTM2882IV-5#PBF 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 industrial, automotive, communications, and healthcare markets.

The LTM2882IV-5#PBF belongs to Analog Devices' µModule isolated interface product line, engineered to simplify system-level isolation design by integrating signal isolation, power conversion, and protocol transceivers into compact, pre-validated packages.

FAQ

What is the maximum continuous working voltage rating for LTM2882IV-5#PBF?

The LTM2882IV-5#PBF has a maximum working insulation voltage (VIORM) of 560VPEAK, validated per IEC 60664-1 and CSA Component Acceptance Notice 5A. This rating ensures safe long-term operation in industrial mains-connected equipment where sustained common-mode voltages up to 400VRMS may occur across the isolation barrier.

Does LTM2882IV-5#PBF support half-duplex RS232 operation, and how is it implemented?

Yes, the LTM2882IV-5#PBF supports half-duplex RS232 using its auxiliary isolated DIN→DOUT channel to drive the DE pin. When DIN is high, DOUT goes high, enabling both T1OUT and T2OUT within <2µs; pulling DIN low disables outputs just as quickly. This eliminates external isolators and timing-critical routing, enabling clean RS485-style control over RS232 lines.

Can LTM2882IV-5#PBF operate with different supply voltages on VCC and VL simultaneously?

Yes, the LTM2882IV-5#PBF fully supports independent operation: VCC is fixed at 4.5V–5.5V (for the LTM2882-5 variant), while VL can range from 1.62V to 5.5V-including values outside VCC's range (e.g., VCC = 5V, VL = 1.8V). No sequencing dependency exists, allowing flexible integration with mixed-voltage SoCs and FPGAs without level shifters.

What is the thermal performance of LTM2882IV-5#PBF under full 150mA VCC2 load?

Under full 150mA VCC2 load at TA = 85°C, the LTM2882IV-5#PBF maintains junction temperature below 125°C with θJA = 30°C/W (LGA package). Its bottom-side thermal pad (GND2) provides low-impedance heat path; recommended PCB layout uses ≥4 thermal vias to an inner ground plane to sustain continuous operation without derating.

How does LTM2882IV-5#PBF handle RS232 driver short-circuit conditions?

The LTM2882IV-5#PBF limits driver short-circuit current to ±70mA (typical) when T1OUT or T2OUT is shorted to GND2 or ±15V. This current limiting, combined with thermal shutdown, prevents damage during accidental shorts or cable faults-enabling robust field deployment without external current-limiting resistors or fuses.