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Analog Devices Inc. LTM2887IY-3S#PBF
- Part No.:
- LTM2887IY-3S#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 32-BBGA Module
- Datasheet:
-
LTM2887IY-3S#PBF.pdf
- Description:
- DGTL ISOL 2500VRMS 6CH SPI 32BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,447
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Product details
Overview
LTM2887IY-3S#PBF from Analog Devices is a galvanically isolated SPI µModule isolator with dual adjustable 5V isolated regulators, 2500VRMS isolation rating, 4MHz SPI data rate, and 100mA per regulator output capability. It operates from a 3V–3.6V input supply, supports 1.62V–5.5V logic levels, and is used in industrial PLCs, motor drives, and isolated sensor interfaces where ground loop elimination and high common-mode transient immunity are critical.
For engineers reviewing the LTM2887IY-3S#PBF datasheet, LTM2887IY-3S#PBF pinout, LTM2887IY-3S#PBF application, or LTM2887IY-3S#PBF equivalent, key selection considerations include its SPI-only interface mode, -40°C to +85°C industrial temperature grade, BGA-32 package with 15mm × 11.25mm footprint, dual 5V isolated supplies with external current limit programming, and 30kV/µs common-mode transient immunity.
Technical Context
The LTM2887IY-3S#PBF implements coreless transformer-based signal isolation with pulse encoding and error-checking refresh logic, enabling robust bidirectional SPI communication across the barrier. Its integrated isolated DC/DC converter delivers two independently regulated 5V outputs (VCC2 and VL2), each programmable via external resistors connected to IVCC2 and IVL2 pins.
This variant is configured for SPI bus operation (not I2C), supports unidirectional SPI up to 8MHz and bidirectional SPI up to 4MHz, and features logic-side enable (ON) control, SDOE-driven tri-state output control, and fail-safe default states (e.g., SCK2/SDI2/CS2 default low on isolation fault).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500VRMS for 1 minute - meets UL-CSA E151738 recognition for reinforced insulation in safety-critical systems. |
| SPI Data Rate | 4MHz bidirectional / 8MHz unidirectional - enables real-time control loop interfacing with microcontrollers and ADCs without protocol overhead. |
| Isolated Supply Outputs | VCC2 and VL2: 5V nominal, adjustable 0.6V–5.5V and 1.8V–5.5V respectively - powers isolated peripherals (e.g., ADCs, gate drivers) without external regulators. |
| Current Limit Programmability | IVCC2/IVL2 pins set precise 49–115mA limits via resistor - allows tailored overcurrent protection matching load requirements. |
| Common-Mode Transient Immunity | 30kV/µs - ensures uninterrupted communication during fast-switching noise events in motor drives and inverters. |
| Logic Supply Range | VL = 1.62V–5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V host MCUs without level shifters. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and test equipment. |
Pinout & Package
Package: 32-pin BGA (15mm × 11.25mm × 3.42mm), RoHS-compliant SAC305 ball finish, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDO (A1) | SPI Serial Data Output | Logic-side output connected to SDO2 across isolation barrier; high-impedance when SDOE = high. |
| DO2 (A2) | Digital Output | Translates logic-side DO2 state to isolated-side I2; high-impedance on isolation failure. |
| SCK (A3) | SPI Clock Input | Unidirectional clock input referenced to VL/GND; drives isolated SCK2 output. |
| SDI (A4) | SPI Data Input | Logic input connected to isolated SDI2; translates isolated-side data to logic side. |
| CS (A5) | SPI Chip Select Input | Active-low enable for SPI transaction; drives isolated CS2 output. |
| SDOE (A6) | Data Output Enable | Controls SDO tri-state: low = enabled, high = high-Z - essential for bus sharing. |
| ON (A7) | Global Enable | High = active power/data; low = logic reset + isolated-side power-off - enables system-level power sequencing. |
| VL (A8) | Logic Supply | Powers all logic-side I/O (1.62V–5.5V); internally bypassed with 1µF capacitor. |
| DO1 (B1) | Digital Output | Translates logic-side DO1 to isolated I1; high-impedance on fault. |
| VCC (B7–B8) | Main Input Supply | 3.0V–3.6V input powering internal DC/DC converter; internally bypassed with 2.2µF. |
| GND (B2–B6) | Logic Ground | Reference for logic-side signals; electrically isolated from GND2. |
| SDO2 (L1) | SPI Serial Data Input | Isolated-side input connected to logic SDO; must not be floated. |
| I2 (L2) | Digital Input | Receives DO2 state; defaults low on isolation failure - safe for driving MOSFET gates. |
| SCK2 (L3) | SPI Clock Output | Push-pull output driven by SCK; defaults low on fault - prevents spurious clocking. |
| SDI2 (L4) | SPI Data Output | Drives logic-side SDI; defaults low on fault - avoids false data latching. |
| CS2 (L5) | SPI Chip Select Output | Drives logic-side CS; defaults high on fault - disables peripheral access during failure. |
| VL2 (L6) | Adjustable Isolated Supply | 1.8V–5.5V regulated output; 5V nominal; adjusted via AVL2 pin and external resistor. |
| IVCC2 (L7) | VCC2 Current Limit Adjust | Connect resistor to GND2 to set VCC2 current limit (49–115mA); internal 10nF bypass. |
| VCC2 (L8) | Adjustable Isolated Supply | 0.6V–5.5V regulated output; 5V nominal; adjusted via AVCC2 pin and external resistor. |
| I1 (K1) | Digital Input | Receives DO1 state; defaults low on fault - ensures fail-safe digital feedback. |
| GND2 (K2–K5) | Isolated Ground | Reference for isolated-side circuitry; galvanically separated from logic GND. |
| AVL2 (K6) | VL2 Voltage Adjust | 600mV reference pin; resistor divider from VL2 to GND2 sets output voltage. |
| IVL2 (K7) | VL2 Current Limit Adjust | Resistor to GND2 programs VL2 current limit (49–115mA); internal 10nF bypass. |
| AVCC2 (K8) | VCC2 Voltage Adjust | 600mV reference pin; resistor divider from VCC2 to GND2 sets output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated DC/DC converter, regulators, decoupling capacitors, and isolation barrier eliminate BOM count and layout complexity. |
| Dual independent 5V isolated supplies | VCC2 and VL2 each deliver >100mA with programmable current limiting - powers isolated ADCs, DACs, and gate drivers from one device. |
| SPI-specific fail-safe defaults | SCK2, SDI2, and CS2 default low/high on isolation fault - prevents unintended peripheral activation in safety-critical systems. |
| Programmable current limit via resistor | IVCC2/IVL2 pins accept standard resistors to set precise 49–115mA limits - replaces discrete current-limit circuits. |
| 1.62V–5.5V logic supply range | Direct compatibility with 1.8V, 3.3V, and 5V MCUs eliminates level-shifter ICs and associated timing skew. |
| 30kV/µs common-mode transient immunity | Robust operation in noisy industrial environments (e.g., VFDs, welding equipment) without signal corruption or lockup. |
Applications
| Industrial Motor Drives | Isolated Sensor Signal Conditioning |
|---|---|
Use Scenario: Interfacing microcontroller SPI to isolated gate drivers and current-sense ADCs in 3-phase inverter stages. IC Role / Device Role / Timing Role: SPI isolator and dual 5V power source for isolated half-bridge drivers and sigma-delta ADCs. Use Value: Eliminates ground loops between control and power domains while delivering synchronized, noise-immune SPI timing at 4MHz. | Use Scenario: Isolating precision analog front-ends (e.g., strain gauge bridges, RTD interfaces) from host MCU in process control transmitters. IC Role / Device Role / Timing Role: Galvanic barrier for SPI-configured delta-sigma ADCs and isolated 5V bias for instrumentation amplifiers. Use Value: Enables 2500VRMS working voltage compliance and rejects >30kV/µs transients induced by nearby switching loads. |
| Programmable Logic Controller (PLC) I/O Modules | Test & Measurement Equipment |
Use Scenario: Isolating digital I/O expansion cards from main controller backplane in modular PLC chassis. IC Role / Device Role / Timing Role: SPI-to-isolated-digital translator and local 5V supply for optocoupler drivers or solid-state relays. Use Value: Supports hot-swap I/O modules with guaranteed 100mA per rail and fail-safe default states preventing relay chatter during faults. | Use Scenario: Isolating DMM or oscilloscope front-end digitizers from USB/Ethernet host controllers. IC Role / Device Role / Timing Role: High-speed SPI isolator with low propagation delay (<100ns) and clean 5V isolated supplies for ADC reference and buffer op-amps. Use Value: Maintains measurement integrity by blocking ground-borne noise and enabling >100dB CMRR in sensitive analog acquisition paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI isolator with integrated power applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6403ARIZ | Quad-channel SPI isolator with single 5V isolated supply (100mA); no second adjustable regulator; uses iCoupler capacitive isolation. | Lacks dual independent 5V rails - unsuitable when isolated peripherals require separate voltage domains (e.g., ADC ref vs. driver bias). | Select when only one isolated supply is needed and quad-channel isolation suffices; verify 2500VRMS and 30kV/µs CMTI meet system requirements. |
| SI8642ED-B-IS | Quad-channel digital isolator with external isolated DC/DC (e.g., RECOM RxxPxx series); no integrated regulators; 5000VRMS isolation. | Requires external isolated power design - increases BOM, layout area, and qualification effort versus LTM2887IY-3S#PBF's fully integrated solution. | Choose when higher isolation rating (5000VRMS) is mandatory and board space permits discrete DC/DC + isolator partitioning. |
Compared with ADUM6403ARIZ and SI8642ED-B-IS, the LTM2887IY-3S#PBF uniquely integrates dual programmable 5V regulators with SPI isolation in one BGA package, eliminating external power components while supporting independent voltage domains and precise current limiting - reducing design cycle time and system-level validation burden.
Availability
LTM2887IY-3S#PBF is available at Aetrix Electronics and suitable for industrial motor drives, PLC I/O modules, and isolated sensor interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-certified designs.
Supply support for LTM2887IY-3S#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 complete, integrated galvanic isolation solutions - combining signal isolation, isolated power, and regulation in µModule packages to simplify high-reliability system design for harsh electrical environments.
FAQ
What interface protocol does the LTM2887IY-3S#PBF support?
The LTM2887IY-3S#PBF is specifically configured for Serial Peripheral Interface (SPI) operation, as indicated by the "S" in its part number suffix. It supports bidirectional SPI up to 4MHz and unidirectional SPI up to 8MHz. It does not support I2C - that functionality is reserved for variants with "I" suffix (e.g., LTM2887IY-3I#PBF). The pinout, timing specifications, and fail-safe defaults (e.g., SCK2/SDI2 default low) are all optimized for SPI.
How do I configure the isolated 5V supplies on the LTM2887IY-3S#PBF?
The LTM2887IY-3S#PBF provides two isolated 5V nominal supplies: VCC2 and VL2. To adjust VCC2, connect a resistor between AVCC2 (K8) and GND2; for VL2, connect a resistor between AVL2 (K6) and GND2. Both adjust pins have a 600mV internal reference, so output voltage is set by resistor divider ratio. For example, a 1.15kΩ resistor from VL2 to GND2 yields ~5V; changing it adjusts the output linearly. Full equations and examples are in the Analog Devices LTM2887 datasheet Section "Applications Information".
What is the maximum continuous working voltage rating of the LTM2887IY-3S#PBF?
The LTM2887IY-3S#PBF has a maximum continuous working voltage (VIORM) of 560VPEAK, as specified in the Isolation Characteristics table of its datasheet. This rating applies to the reinforced insulation barrier between primary (VCC/VL/GND) and secondary (VCC2/VL2/GND2) sides. It is derived from the 2500VRMS dielectric withstand rating and validated per IEC 60664-1 for pollution degree 2, making it suitable for industrial 480VAC systems with appropriate creepage/clearance design.
Does the LTM2887IY-3S#PBF require external decoupling capacitors?
Yes, the LTM2887IY-3S#PBF requires external decoupling capacitors despite its integrated µModule architecture. Specifically: a 2.2µF capacitor on VCC (B7–B8), a 1µF capacitor on VL (A8), and two 4.7µF capacitors on VCC2 (L8) and VL2 (L6). Additionally, 10nF capacitors are required on IVCC2 (L7) and IVL2 (K7). These values are specified in the Pin Functions section and Layout Guidelines of the datasheet; omitting them risks instability, ripple, or reduced transient immunity.
What happens to the outputs of the LTM2887IY-3S#PBF during an isolation barrier failure?
During an isolation barrier failure, the LTM2887IY-3S#PBF implements fail-safe defaults per its SPI configuration: SCK2, SDI2, and CS2 default to low, low, and high respectively; DO1 and DO2 go high-impedance; and SDO enters high-impedance when SDOE is asserted. These states prevent unintended activation of downstream devices (e.g., gate drivers, relays) and align with SIL-2 functional safety expectations. The behavior is explicitly documented in the Pin Functions section for both logic and isolated sides.
LTM2887IY-3S#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:
- SPI
- 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:
- 4MHz, 8MHz
- Propagation Delay tpLH / tpHL (Max):
- 100ns, 100ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 3ns, 3ns
- Voltage - Supply:
- 3V ~ 3.6V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-BGA (15x11.25)
LTM2887IY-3S#PBF FAQ
1.How can I place an order for LTM2887IY-3S#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2887IY-3S#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 LTM2887IY-3S#PBF reliable?
The price and inventory of LTM2887IY-3S#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2887IY-3S#PBF is usually 5 days.
3.What payment methods are accepted for LTM2887IY-3S#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2887IY-3S#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2887IY-3S#PBF?
LTM2887IY-3S#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2887IY-3S#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 LTM2887IY-3S#PBF?
For technical support, including LTM2887IY-3S#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2887IY-3S#PBF requirements.
6.How does Aetrix verify that LTM2887IY-3S#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2887IY-3S#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 LTM2887IY-3S#PBF meets industry standards.
7.What is the process for return or replacement of LTM2887IY-3S#PBF?
All LTM2887IY-3S#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2887IY-3S#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 LTM2887IY-3S#PBF part is unused and in its original packaging.
Return procedure for LTM2887IY-3S#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTM2887IY-3S#PBF Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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