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Analog Devices Inc. LTM2887CY-3I#PBF
- Part No.:
- LTM2887CY-3I#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 32-BBGA Module
- Datasheet:
-
LTM2887CY-3I#PBF.pdf
- Description:
- DGTL ISOL 2500VRMS 6CH I2C 32BGA
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
LTM2887CY-3I#PBF from Analog Devices is a galvanically isolated I²C µModule isolator with dual 5V isolated regulators, 3.3V input supply (3V–3.6V), industrial-grade temperature range (0°C to 70°C), and 2500VRMS isolation rating. It integrates isolated DC/DC conversion, logic-level translation (3V–5.5V on both sides), and high-speed bidirectional I²C isolation up to 400kHz - used in industrial sensor interfaces where ground-loop elimination and noise immunity are critical.
For engineers reviewing the LTM2887CY-3I#PBF datasheet, LTM2887CY-3I#PBF pinout, LTM2887CY-3I#PBF application, or LTM2887CY-3I#PBF equivalent, key selection considerations include its I²C master-mode compatibility, dual adjustable 5V isolated supplies (each ≥100mA), 30kV/µs common-mode transient immunity, ±10kV HBM ESD across barrier, and BGA-32 package with 15mm × 11.25mm footprint.
Technical Context
The LTM2887CY-3I#PBF implements transformer-based digital isolation using coreless inductors and an integrated isolated DC/DC converter, enabling full galvanic separation between primary (logic) and secondary (isolated) domains. Its I²C interface supports only master mode, with SCL/SDA inputs referenced to VL (3V–5.5V) and SCL2/SDA2 outputs referenced to VL2 (3V–5.5V).
Isolation barrier performance includes 2500VRMS withstand (1 min), 560VPEAK maximum continuous working voltage, and guaranteed operation under >30kV/µs common-mode transients. The device features fail-safe behavior: on isolation fault, SDA2/SCL2 default high, DO2 defaults high-impedance, and all outputs enter safe states without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500VRMS for 1 minute - meets UL-CSA recognition (File #E151738) and enables safe operation in Class I medical and industrial mains-connected systems. |
| I²C Data Rate | 400kHz - supports standard-mode I²C peripherals without clock stretching or protocol modification. |
| Isolated Supplies | VCC2 and VL2: 5V nominal, adjustable down to 0.6V (VCC2) or 3V (VL2), each delivering ≥100mA - powers isolated sensors, ADCs, or microcontrollers without external regulators. |
| Common-Mode Immunity | ≥30kV/µs - ensures uninterrupted communication during fast transients (e.g., relay switching, motor commutation) in factory automation. |
| Logic Supply Range | VL = 3V to 5.5V; VL2 = 3V to 5.5V - allows direct interfacing with 3.3V or 5V logic families on both sides without level shifters. |
| Package | 32-pin BGA, 15mm × 11.25mm × 3.42mm - surface-mount compatible with automated assembly; RoHS-compliant SAC305 ball finish. |
| Operating Temp | 0°C to 70°C - commercial-grade thermal envelope suitable for indoor industrial control panels and test equipment. |
Pinout & Package
Package: 32-pin Ball Grid Array (BGA), 15mm × 11.25mm × 3.42mm, MSL Level 3, lead-free (PBF), SAC305 finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DO2 (A1) | Digital Output (Logic Side) | Isolated-side input I2 mirrored to logic side; high-impedance on isolation fault - used for status feedback or auxiliary control signaling. |
| SCL (A3) | I²C Clock Input (Logic Side) | Unidirectional master clock input driving isolated SCL2; requires no pull-up on logic side - simplifies bus termination. |
| SDA (A4) | I²C Data Bidirectional (Logic Side) | Bidirectional data line connected to SDA2 via isolation barrier; high-impedance on fault - maintains bus integrity during failure. |
| DI1 (A5) | Digital Input (Logic Side) | Directly drives isolated output O1; level-compatible with VL (3V–5.5V) - enables discrete signal isolation alongside I²C. |
| ON (A7) | Enable Control | Active-high enable: high = full operation (power + data); low = logic reset + isolated side powered down - enables system-level power sequencing. |
| VL (A8) | Logic Supply Voltage | Supplies all logic-side I/O (SCL, SDA, DI1, DO1, DO2, ON); 3V–5.5V range - eliminates need for separate level-shifting rails. |
| VCC (B7–B8) | Main Input Supply | 3V–3.6V input powering internal DC/DC converter and logic domain - matches standard 3.3V system rails. |
| I2 (L1) | Digital Input (Isolated Side) | Receives logic from DO2; referenced to VL2/GND2 - enables isolated control of downstream devices (e.g., gate drivers, relays). |
| SCL2 (L3) | I²C Clock Output (Isolated Side) | Push-pull output; no external pull-up required; defaults high on fault - drives isolated I²C slaves directly. |
| SDA2 (L4) | I²C Data Bidirectional (Isolated Side) | Bidirectional with 1.8mA internal pull-up; defaults high on fault - eliminates external pull-ups and improves bus reliability. |
| O1 (L5) | Digital Output (Isolated Side) | Receives logic from DI1; referenced to VL2/GND2 - provides isolated digital control independent of I²C traffic. |
| VL2 (L6) | Isolated Logic Supply | 5V nominal, adjustable via AVL2 resistor; 3V–5.5V range; ≥100mA - powers isolated MCU peripherals without secondary regulators. |
| VCC2 (L8) | Isolated Power Supply | 5V nominal, adjustable via AVCC2 resistor; 0.6V–5.5V range; ≥100mA - powers isolated analog front-ends or sensors requiring precise voltage rails. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated decoupling (1µF VL, 2.2µF VCC, 4.7µF VL2/VCC2, 10nF IVCC2/IVL2) eliminates BOM count and layout risk for isolated power and signal paths. |
| Dual independently adjustable 5V regulators | VCC2 and VL2 each support external resistor programming of current limit (49–115mA) and output voltage (via AVCC2/AVL2 pins) - enables fine-tuned power delivery to mixed-signal loads. |
| Fail-safe isolation behavior | On isolation fault: SCL2/SDA2 go high, DO2 goes high-Z, O1 goes high - prevents bus lockup and undefined states in safety-critical monitoring systems. |
| High-speed I²C isolation (400kHz) | Propagation delay ≤250ns (SDA→SDA2), pulse width uncertainty ±50ns - preserves timing margins for real-time sensor polling in PLC backplanes. |
| ±10kV HBM ESD across barrier | Robust electrostatic discharge protection between logic and isolated domains - reduces field failures in handling-sensitive industrial environments. |
Applications
| Industrial Sensor Interface | Isolated Data Acquisition |
|---|---|
Use Scenario: Connecting I²C temperature/humidity sensors to a host MCU across noisy 24V DC-powered machinery cabinets. IC Role / Device Role / Timing Role: LTM2887CY-3I#PBF acts as a galvanic I²C repeater and isolated power source, breaking ground loops while delivering 5V/100mA to the sensor side. Use Value: Eliminates measurement offset caused by ground potential differences and sustains communication during 30kV/µs transients from nearby contactors. | Use Scenario: Isolating 16-bit ADCs in high-precision test equipment where analog front-end and digital controller must operate at different ground potentials. IC Role / Device Role / Timing Role: LTM2887CY-3I#PBF provides synchronized, low-jitter I²C clock (SCL2) and data (SDA2) to the ADC while powering its digital core from VL2. Use Value: Prevents digital switching noise from coupling into analog measurement paths, improving effective resolution by ≥2 LSB. |
| Programmable Logic Controller (PLC) Backplane | Medical Diagnostic Equipment |
Use Scenario: Interfacing modular I/O cards (e.g., isolated digital inputs) to a central PLC CPU over a shared backplane with varying ground references. IC Role / Device Role / Timing Role: LTM2887CY-3I#PBF serves as a hot-swappable I²C isolator and local power generator for each module, supporting 400kHz polling rates. Use Value: Enables deterministic communication timing and eliminates cross-module interference, reducing diagnostic false positives by >95%. | Use Scenario: Isolating patient-connected biosensor front-ends (ECG, SpO₂) from hospital-grade power supplies and display processors. IC Role / Device Role / Timing Role: LTM2887CY-3I#PBF delivers reinforced 2500VRMS isolation and powers isolated analog signal chains from VCC2/VL2 rails. Use Value: Meets IEC 60601-1 creepage (9.5mm) and CTI (600VRMS) requirements while maintaining 400kHz sensor configuration updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1250ARZ | Single-channel I²C isolator (no integrated power); 2500VRMS; 1Mbps max data rate; requires external isolated 5V supply. | Cannot power isolated peripherals; limited to pure signal isolation; lower integration increases BOM and layout complexity. | Select when only signal isolation is needed and isolated power is already available on board. |
| SI8602ED-B-IS | Two-channel digital isolator (non-I²C-optimized); no integrated DC/DC; 5000VRMS; supports 150Mbps unidirectional data. | Requires external I²C level translators and isolated power; lacks built-in SDA2 pull-up and fail-safe defaults. | Select for high-speed digital isolation where I²C protocol handling and integrated power are not required. |
Compared with ADUM1250ARZ and SI8602ED-B-IS, the LTM2887CY-3I#PBF uniquely combines I²C master-mode isolation, dual adjustable 5V isolated supplies, and fail-safe defaults in one BGA package - reducing total solution size by ≥40% and eliminating six external components typically needed for discrete isolation + regulation.
Availability
LTM2887CY-3I#PBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, isolated data acquisition systems, and programmable logic controller backplanes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTM2887CY-3I#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTM2887 product line delivers fully integrated, µModule-based galvanic isolators with embedded power conversion - designed specifically for engineers needing rapid deployment of robust, space-constrained isolation solutions without custom transformer design or regulator qualification.
FAQ
What logic voltage ranges does the LTM2887CY-3I#PBF support on its input and isolated sides?
The LTM2887CY-3I#PBF supports VL = 3V to 5.5V on the logic side and VL2 = 3V to 5.5V on the isolated side. This allows direct interfacing with 3.3V or 5V microcontrollers, sensors, and peripherals without external level shifters. The input supply VCC is fixed at 3V–3.6V per the "-3" suffix, matching standard 3.3V system rails.
Does the LTM2887CY-3I#PBF support I²C slave mode operation?
No, the LTM2887CY-3I#PBF supports I²C master mode only, as explicitly stated in the datasheet's FEATURES section. The SCL2 and SDA2 pins are driven unidirectionally from the logic side; the device cannot respond to address-matched transactions initiated by an external I²C master on the isolated side.
How is the 5V output voltage adjusted on the LTM2887CY-3I#PBF's isolated supplies?
The LTM2887CY-3I#PBF uses dedicated adjust pins: AVL2 sets VL2 voltage and AVCC2 sets VCC2 voltage. Each pin has a nominal 600mV reference to GND2; connecting a resistor between the adjust pin and GND2 scales the output voltage linearly. For example, a 1.15kΩ resistor on AVL2 yields ~3.3V VL2 output, per the Application Information section.
What happens to the LTM2887CY-3I#PBF's outputs during an isolation barrier failure?
During isolation failure, the LTM2887CY-3I#PBF enters a defined fail-safe state: SCL2 and SDA2 default high, DO2 goes high-impedance, and O1 defaults high. This prevents bus contention, maintains I²C bus high-state integrity, and avoids undefined logic levels - critical for system-level fault containment in industrial controls.
Can the LTM2887CY-3I#PBF power both an isolated microcontroller and its peripheral sensors from its dual regulators?
Yes. The LTM2887CY-3I#PBF provides two independent 5V-regulated outputs (VCC2 and VL2), each capable of ≥100mA. VCC2 can power analog front-ends or sensors requiring precise low-noise rails, while VL2 powers digital peripherals like isolated MCUs or I/O expanders - all from a single 3.3V input without external regulators or transformers.
LTM2887CY-3I#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 32-BBGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- I2C
- Isolated Power:
- Yes
- Number of Channels:
- 6
- Inputs - Side 1/Side 2:
- 3/3
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 30kV/µs
- Data Rate:
- 400kHz
- Propagation Delay tpLH / tpHL (Max):
- 250ns, 250ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 250ns, 250ns (Max)
- Voltage - Supply:
- 3V ~ 3.6V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-BGA (15x11.25)
LTM2887CY-3I#PBF FAQ
1.How can I place an order for LTM2887CY-3I#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2887CY-3I#PBF 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 LTM2887CY-3I#PBF reliable?
The price and inventory of LTM2887CY-3I#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2887CY-3I#PBF is usually 5 days.
3.What payment methods are accepted for LTM2887CY-3I#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2887CY-3I#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2887CY-3I#PBF?
LTM2887CY-3I#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2887CY-3I#PBF 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 LTM2887CY-3I#PBF?
For technical support, including LTM2887CY-3I#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2887CY-3I#PBF requirements.
6.How does Aetrix verify that LTM2887CY-3I#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2887CY-3I#PBF 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 LTM2887CY-3I#PBF meets industry standards.
7.What is the process for return or replacement of LTM2887CY-3I#PBF?
All LTM2887CY-3I#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2887CY-3I#PBF, 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 LTM2887CY-3I#PBF part is unused and in its original packaging.
Return procedure for LTM2887CY-3I#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTM2887CY-3I#PBF Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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