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Analog Devices Inc. LTM2887CY-3S#PBF
- Part No.:
- LTM2887CY-3S#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 32-BBGA Module
- Datasheet:
-
LTM2887CY-3S#PBF.pdf
- Description:
- DGTL ISOL 2500VRMS 6CH SPI 32BGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,909
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Product details
Overview
LTM2887CY-3S#PBF from Analog Devices is a galvanically isolated SPI µModule isolator with dual 5V isolated regulators, 3.3V input supply, 2500VRMS isolation, and 4MHz SPI data rate. It integrates isolated DC/DC conversion, logic-level translation (1.62V–5.5V), and programmable current-limited outputs (≥100mA each) in a single BGA package. Used in industrial PLCs to isolate SPI-connected ADCs from noisy motor-control domains.
For engineers reviewing the LTM2887CY-3S#PBF datasheet, LTM2887CY-3S#PBF pinout, LTM2887CY-3S#PBF application, or LTM2887CY-3S#PBF equivalent, key selection criteria include its 3.3V input compatibility, SPI-only interface mode, dual adjustable 5V isolated supplies, 30kV/µs common-mode transient immunity, and commercial-grade temperature range (0°C to 70°C).
Technical Context
The LTM2887CY-3S#PBF implements coreless transformer-based signal isolation with embedded error-checking and automatic fail-safe shutdown. Its integrated DC/DC converter delivers two independent 5V regulated outputs (VCC2 and VL2), each externally adjustable via dedicated current-limit pins (IVCC2, IVL2) and voltage-adjust pins (AVCC2, AVL2).
It supports unidirectional and bidirectional SPI communication at up to 8MHz and 4MHz respectively, with propagation delays ≤100ns and pulse width uncertainty ±50ns. Logic-side supply (VL) operates from 1.62V to 5.5V, while input supply (VCC) is strictly 3.0V–3.6V per the "-3" suffix.
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 sensor data acquisition without protocol layer changes |
| Input Supply Range | 3.0V to 3.6V - compatible with standard 3.3V system rails; no level-shifting required |
| Isolated Supplies | VCC2 & VL2: 0.6V–5.5V adjustable, ≥100mA each - powers isolated ADCs, DACs, or gate drivers directly |
| Common-Mode Immunity | 30kV/µs - suppresses fast transients from motor drives or relay switching in industrial environments |
| Logic Supply Range | 1.62V to 5.5V - interfaces seamlessly with 1.8V, 2.5V, 3.3V, or 5V controllers without external translators |
| Package | 32-pin BGA, 15mm × 11.25mm × 3.42mm - compact footprint suitable for space-constrained PCB layouts |
Pinout & Package
32-pin Ball Grid Array (BGA) package, 15mm × 11.25mm × 3.42mm, RoHS-compliant SAC305 solder finish, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDO (A1) | SPI Serial Data Output | Logic-side output connected across isolation barrier to SDO2; high-impedance on fault |
| DO2 (A2) | Digital Output | Translates DO2 state to I2 on isolated side; high-impedance during isolation failure |
| SCK (A3) | SPI Clock Input | Unidirectional clock input referenced to VL/GND; must not be left floating |
| SDI (A4) | SPI Data Input | Translates SDI state to SDI2 on isolated side; must not be left floating |
| CS (A5) | SPI Chip Select Input | Active-low enable for SPI peripheral; translates to CS2 on isolated side |
| SDOE (A6) | SPI Output Enable | Controls SDO tri-state: low = enabled, high = high-Z - enables shared-bus operation |
| ON (A7) | Enable Control | High = full operation (power + data); low = reset + isolated-side power-off |
| VL (A8) | Logic Supply | 1.62V–5.5V interface rail for all logic pins; internally bypassed with 1µF |
| DO1 (B1) | Digital Output | Translates DO1 state to I1 on isolated side; high-impedance on fault |
| VCC (B7–B8) | Main Input Supply | 3.0V–3.6V primary power; internally bypassed with 2.2µF |
| GND (B2–B6) | Logic Ground | Reference for VL, VCC, and logic-side signals; separate from GND2 |
| SDO2 (L1) | SPI Serial Data Input | Isolated-side input connected to SDO; defaults low on isolation failure |
| I2 (L2) | Digital Input | Translates I2 state to DO2; must not be left floating |
| SCK2 (L3) | SPI Clock Output | Isolated-side clock output referenced to VL2/GND2; defaults low on fault |
| SDI2 (L4) | SPI Data Output | Isolated-side output connected to SDI; defaults low on isolation failure |
| CS2 (L5) | SPI Chip Select Output | Active-low output translating CS state; defaults high on isolation failure |
| VL2 (L6) | Adjustable Isolated Supply | 1.8V–5.5V regulated output; internally bypassed with 4.7µF |
| IVCC2 (L7) | VCC2 Current Limit Adjust | Resistor-to-GND2 sets VCC2 current limit (49–115mA); tie to GND2 if unused |
| VCC2 (L8) | Adjustable Isolated Supply | 0.6V–5.5V regulated output; internally bypassed with 4.7µF |
| I1 (K1) | Digital Input | Translates I1 state to DO1; must not be left floating |
| GND2 (K2–K5) | Isolated Ground | Reference for VL2, VCC2, and isolated-side signals; galvanically separated from GND |
| AVL2 (K6) | VL2 Voltage Adjust | 600mV reference pin; resistor divider sets VL2 output voltage |
| IVL2 (K7) | VL2 Current Limit Adjust | Resistor-to-GND2 sets VL2 current limit (49–115mA); tie to GND2 if unused |
| AVCC2 (K8) | VCC2 Voltage Adjust | 600mV reference pin; resistor divider sets VCC2 output voltage |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated DC/DC converter, regulators, decoupling capacitors, and isolation circuitry eliminate BOM count and layout complexity |
| Dual independently adjustable 5V supplies | VCC2 and VL2 each support 0.6V–5.5V output with external resistor programming of both voltage and current limit |
| 30kV/µs common-mode transient immunity | Ensures uninterrupted SPI communication during fast ground-potential shifts in motor drives or HV inverters |
| Fail-safe isolation behavior | All digital outputs default to defined states (high-Z, high, or low) during isolation barrier failure - prevents undefined system behavior |
| Low-power shutdown mode | Input supply current <10µA when ON = low - enables energy-efficient system-level power gating |
Applications
| Industrial PLC I/O Modules | Isolated Sensor Interface |
|---|---|
Use Scenario: Isolating SPI-configured analog input modules (e.g., ADS8688) from CPU backplane in programmable logic controllers. IC Role / Device Role / Timing Role: SPI µModule isolator providing galvanic separation between field-side sensors and controller-side SPI master. Use Value: Breaks ground loops between 24V field wiring and 3.3V logic, enabling stable 16-bit ADC sampling despite >1kV common-mode noise. | Use Scenario: Interfacing isolated temperature and pressure sensors (e.g., AD7124-8) to microcontroller over SPI in hazardous-area instrumentation. IC Role / Device Role / Timing Role: Signal and power isolator delivering regulated 3.3V to sensor side while maintaining 4MHz SPI timing integrity. Use Value: Eliminates need for separate isolated DC/DC converters and level shifters - reduces bill-of-materials by 4+ components. |
| Motor Drive Feedback Isolation | Medical Diagnostic Equipment |
Use Scenario: Isolating position encoder SPI data (e.g., AMT203-V, AS5047P) from gate driver control logic in servo amplifiers. IC Role / Device Role / Timing Role: High-speed SPI isolator with 30kV/µs CMTI ensuring accurate rotor position reporting during IGBT switching events. Use Value: Prevents encoder data corruption caused by dV/dt-induced ground bounce - maintains closed-loop stability under full-load conditions. | Use Scenario: Isolating SPI-connected patient monitoring front-ends (e.g., ADAS1000 ECG AFE) from host processor in Class II medical devices. IC Role / Device Role / Timing Role: Reinforced insulation barrier meeting 2500VRMS safety requirements while powering isolated analog signal chain. Use Value: Achieves creepage distance >9.5mm and CTI = 600VRMS in compact BGA package - satisfies IEC 60601-1 3rd edition compliance. |
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 |
|---|---|---|---|
| ADUM6403ARWZ | Quad-channel digital isolator only; no integrated regulators - requires external isolated DC/DC (e.g., ADuM5020) | Higher component count and board area; lower total solution efficiency due to discrete regulator losses | Select when needing >4 isolated channels or tighter timing skew specs (<1ns) than LTM2887CY-3S#PBF provides |
| SI8642ED-B-IS | 4-channel digital isolator with integrated 5V DC/DC; supports I2C/SPI but lacks dual independent regulators and programmable current limits | Fixed 5V outputs only; no voltage adjust capability - limits flexibility for mixed-voltage isolated peripherals | Select when cost sensitivity outweighs need for dual adjustable supplies and higher CMTI (SI8642ED-B-IS: 15kV/µs vs. 30kV/µs) |
Compared with ADUM6403ARWZ and SI8642ED-B-IS, the LTM2887CY-3S#PBF uniquely combines SPI isolation, dual independently adjustable 5V regulators, and 30kV/µs CMTI in one BGA package - reducing design effort, PCB area, and qualification burden for industrial and medical systems requiring robust, self-contained isolation.
Availability
LTM2887CY-3S#PBF is available at Aetrix Electronics and suitable for industrial automation, test equipment, and medical diagnostics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTM2887CY-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, verified µModule solutions for signal and power isolation - designed to simplify system-level safety certification and accelerate time-to-market for ruggedized embedded systems.
FAQ
What logic voltage levels does the LTM2887CY-3S#PBF support on its VL pin?
The LTM2887CY-3S#PBF supports a logic supply range of 1.62V to 5.5V on the VL pin, enabling direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without external level shifters. This wide range is explicitly specified in the Electrical Characteristics table and applies across the full operating temperature range (0°C to 70°C) for the "C" grade device.
Can the LTM2887CY-3S#PBF be used with I2C interfaces?
No, the LTM2887CY-3S#PBF is configured exclusively for SPI operation, as indicated by the "-S" suffix in its part number. The "-I" variant (e.g., LTM2887CY-3I#PBF) supports I2C master-mode only. Using the LTM2887CY-3S#PBF with I2C signals will result in incorrect timing, missing ACK/NACK handling, and potential bus lockup due to incompatible drive strength and slew-rate requirements.
What is the maximum continuous working voltage rating for the LTM2887CY-3S#PBF?
The LTM2887CY-3S#PBF has a maximum continuous working voltage (VIORM) of 560VPEAK, as confirmed in the Isolation Characteristics table. This rating applies to the reinforced insulation barrier between primary (VCC/VL/GND) and secondary (VCC2/VL2/GND2) sides and is validated per IEC 60664-1 and UL 1577 standards.
How do I adjust the output voltage of VCC2 and VL2 on the LTM2887CY-3S#PBF?
VCC2 and VL2 output voltages are adjusted using external resistor dividers connected to AVCC2/K8 and AVL2/K6 pins, respectively. Each pin provides a precise 600mV internal reference; the output voltage equals 600mV × (1 + R1/R2), where R1 connects to the adjust pin and R2 connects to GND2. Full calculation guidance is provided in the Applications Information section of the LTM2887CY-3S#PBF datasheet.
Does the LTM2887CY-3S#PBF require external bypass capacitors?
Yes, the LTM2887CY-3S#PBF requires external bypass capacitors: 2.2µF on VCC (B7–B8), 1µF on VL (A8), and 4.7µF on both VCC2 (L8) and VL2 (L6). These values are specified in the Block Diagrams and Pin Functions sections and are mandatory for stable regulator operation and noise suppression - omitting them causes output ripple exceeding 1mVRMS and potential communication errors.
LTM2887CY-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:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-BGA (15x11.25)
LTM2887CY-3S#PBF FAQ
1.How can I place an order for LTM2887CY-3S#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2887CY-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 LTM2887CY-3S#PBF reliable?
The price and inventory of LTM2887CY-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 LTM2887CY-3S#PBF is usually 5 days.
3.What payment methods are accepted for LTM2887CY-3S#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2887CY-3S#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2887CY-3S#PBF?
LTM2887CY-3S#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2887CY-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 LTM2887CY-3S#PBF?
For technical support, including LTM2887CY-3S#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2887CY-3S#PBF requirements.
6.How does Aetrix verify that LTM2887CY-3S#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2887CY-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 LTM2887CY-3S#PBF meets industry standards.
7.What is the process for return or replacement of LTM2887CY-3S#PBF?
All LTM2887CY-3S#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2887CY-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 LTM2887CY-3S#PBF part is unused and in its original packaging.
Return procedure for LTM2887CY-3S#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTM2887CY-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
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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