Analog Devices Inc. LTM2892IY-S#PBF

Overview

LTM2892IY-S#PBF from Analog Devices (formerly Linear Technology) is a galvanically isolated 6-channel digital µModule isolator optimized for SPI interface applications. It provides 3500V_RMS isolation, supports 3V–5.5V supply and 1.62V–5.5V logic levels per side, delivers 8MHz unidirectional or 4MHz bidirectional SPI data rates, and operates across –40°C to +85°C. It enables robust communication in industrial PLCs where ground loops and >50kV/µs common-mode transients must be suppressed.

For engineers reviewing the LTM2892IY-S#PBF datasheet, LTM2892IY-S#PBF pinout, LTM2892IY-S#PBF application, or LTM2892IY-S#PBF equivalent, key selection criteria include its 24-pin BGA package with independent VL1/VL2 logic supplies, integrated 0.22µF/1.0µF bypassing, high-speed channel timing (≤100ns packet transfer), and IEC 60112 CTI 600V_RMS insulation system.

Technical Context

The LTM2892IY-S#PBF implements serial packet-based encoding across a coupled-inductor isolation barrier, supporting three bidirectional channels (INA/OUTA, INB/OUTB, INC/OUTC) and three unidirectional channels (OUTD/IND, OUTE/INE, OUTF/INF) with independent enable control via EOUTD/EOUTA. Its architecture separates power (VCC1/VCC2) and logic (VL1/VL2) domains to eliminate supply interdependence.

It features dual enable inputs (ON1/ON2) that place respective sides into high-impedance reset states, programmable output enable terminals (EOUTD/EOUTA), and failsafe default states (e.g., OUTC high, OUTA/OUTB low on failure). Propagation delay is guaranteed ≤100ns with ≤50ns pulse width uncertainty and ≤20ns rise/fall times at 15pF load.

Key Specifications

Pinout & Package

24-pin BGA package (9mm × 6.25mm × 2.91mm) with 0.5mm pitch; thermally enhanced bottom-side thermal pad; JEDEC-standard moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Compared with ADUM3401CRWZ and SI8660BB-B-IS, the LTM2892IY-S#PBF uniquely integrates full decoupling capacitance, supports wider logic voltage range (1.62V–5.5V), guarantees failsafe output states, and delivers industry-leading 50kV/µs common-mode immunity - making it optimal for space-constrained, high-reliability industrial designs.

Availability

LTM2892IY-S#PBF is available at Aetrix Electronics and suitable for industrial PLCs, motor drive gate driver interfaces, test and measurement equipment, and energy metering communication interfaces requiring stable component supply and long-term lifecycle support.

Supply support for LTM2892IY-S#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTM2892IY-S#PBF belongs to the µModule isolator product line, designed specifically for engineers needing complete, certified, drop-in isolation solutions that eliminate external passive components and simplify compliance with industrial safety standards.

FAQ

What is the maximum data rate supported by LTM2892IY-S#PBF in SPI mode?

The LTM2892IY-S#PBF supports up to 8MHz unidirectional and 4MHz bidirectional SPI data rates. These values are guaranteed over the full –40°C to +85°C operating temperature range with 15pF load capacitance and apply specifically to the LTM2892-S variant. The LTM2892IY-S#PBF achieves this using serialized packet transmission across its coupled-inductor isolation barrier, with propagation delay bounded at 100ns.

Does LTM2892IY-S#PBF require external decoupling capacitors?

No, the LTM2892IY-S#PBF does not require external decoupling capacitors. It integrates 0.22µF capacitors on each VL1 and VL2 logic supply pin and 1.0µF capacitors on VCC1 and VCC2 main supply pins. This eliminates four external components, reduces PCB area, and ensures optimal high-frequency noise suppression per the manufacturer's validated layout.

What happens to output states during an isolation barrier failure in LTM2892IY-S#PBF?

During an isolation barrier failure, the LTM2892IY-S#PBF implements defined failsafe behavior: OUTA and OUTB default to low, while OUTC defaults to high. This deterministic state prevents undefined logic conditions in safety-critical applications such as motor control enable lines or fault-reporting paths, directly enhancing system robustness without requiring external supervision circuitry.

Can LTM2892IY-S#PBF interface between 1.8V and 5V logic domains?

Yes, the LTM2892IY-S#PBF supports 1.62V to 5.5V logic levels independently on VL1 (logic side) and VL2 (isolated side). This allows direct interfacing between a 1.8V microcontroller and a 5V isolated sensor or actuator without external level shifters - a capability confirmed in the Electrical Characteristics table for both LTM2892-S and LTM2892-I variants.

What safety certifications does LTM2892IY-S#PBF hold?

The LTM2892IY-S#PBF is UL-CSA Recognized (File #E151738) with 3500V_RMS isolation rating for 1 minute, 850V_PEAK maximum continuous working voltage, CTI rating of 600V_RMS per IEC 60112, and 5mm creepage distance. These certifications validate its suitability for reinforced insulation in industrial equipment meeting IEC 61000-4-5 and IEC 61800-5-1 requirements.