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Analog Devices Inc. LTM2885IY#PBF
- Part No.:
- LTM2885IY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 42-BBGA
- Datasheet:
-
LTM2885IY#PBF.pdf
- Description:
- DGTL ISO 6.5KV RS422/RS485 42BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
LTM2885IY#PBF from Analog Devices is a galvanically isolated RS485 transceiver µModule® with 6500VRMS isolation, 20Mbps data rate, and integrated 5V/1W isolated DC/DC power supply - designed for industrial fieldbus nodes requiring high common-mode transient immunity and creepage-critical isolation in harsh environments.
For engineers reviewing the LTM2885IY#PBF datasheet, LTM2885IY#PBF pinout, LTM2885IY#PBF application, or LTM2885IY#PBF equivalent, key selection criteria include certified 6500VRMS reinforced insulation, 14.6mm creepage/distance-through-insulation, selectable 20Mbps/250kbps data rate, and pin-selectable 120Ω termination for RS485 bus integrity without external components.
Technical Context
The LTM2885IY#PBF implements transformer-based galvanic isolation using embedded inductively coupled coils to transmit differential signals across the barrier, enabling robust communication under >30kV/µs common-mode transients without data corruption or jitter. Its architecture integrates both signal isolation and regulated isolated power in a single SiP.
It supports half- or full-duplex RS485 operation with TIA/EIA-485-A and PROFIBUS compliance, 1.62V–5.5V logic supply range, ±15kV HBM ESD protection on bus pins, and software-controllable Driver Enable (DE) via an auxiliary isolated digital channel with <2µs toggle latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 6500VRMS reinforced insulation per UL1577 and CSA #5A - enables safe operation in mains-connected industrial equipment with high ground potential differences. |
| Data Rate | Selectable 20Mbps or 250kbps - supports high-speed diagnostics or low-power remote sensing without changing hardware. |
| Isolated Power Output | 5V @ 1W regulated output - powers adjacent isolated ADCs, DACs, or microcontrollers without external DC/DC converters. |
| Creepage & Clearance | 14.6mm creepage / 14.3mm clearance - meets IEC 61000-4-5 surge and IEC 60664-1 overvoltage Category III requirements. |
| Common-Mode Transient Immunity | 30kV/µs - maintains error-free RS485 communication during fast-switching motor drive or relay-induced noise events. |
| ESD Protection | ±15kV HBM on bus pins - eliminates need for external TVS diodes in factory automation interfaces. |
| Operating Temperature | –40°C to +105°C - qualified for deployment in outdoor enclosures, motor control cabinets, and railway signaling systems. |
Pinout & Package
Package: 22mm × 9mm BGA-42 (ball grid array), RoHS-compliant SAC305 solder balls, marked with part number, lot code, date code (YYWW), and assembly location (e.g., MY).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC1 | Primary-side logic supply input | Accepts 1.62V–5.5V to power internal digital circuitry and driver/receiver logic. |
| GND1 | Primary-side ground reference | Reference for VCC1 and digital interface signals; must be separated from GND2 by ≥8mm PCB spacing. |
| RO | Receiver output | LVCMOS-compatible logic-level output reflecting RS485 bus state; drives MCU or FPGA inputs directly. |
| DI | Driver input | Logic-level input controlling RS485 transmitter; compatible with 1.62V–5.5V logic families. |
| DE | Driver enable (isolated) | Isolated control signal toggling driver state in <2µs - enables precise half-duplex timing without cross-talk. |
| A / B | RS485 differential bus terminals | High-impedance, ±15kV HBM-protected terminals connecting directly to twisted-pair field wiring. |
| TERM | 120Ω termination select | Logic-high enables internal 120Ω termination resistor - eliminates manual jumpering for bus-end node configuration. |
| VCC2 | Secondary-side isolated supply output | Regulated 5V output capable of delivering 200mA - powers isolated peripherals without external regulation. |
| GND2 | Secondary-side isolated ground | Independent ground reference for isolated side; must not be connected to GND1 except via isolation barrier. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isolated DC/DC converter | Eliminates need for external isolated power supplies - reduces BOM count and board area in space-constrained PLC modules. |
| Pin-selectable 120Ω termination | Enables software-configurable bus termination at node level - avoids manual resistor placement and improves field maintenance flexibility. |
| 30kV/µs common-mode transient immunity | Ensures uninterrupted RS485 communication during lightning-induced surges or contactor switching in substations. |
| Differential data transmission | Uses transformer-coupled coils to reject common-mode noise - achieves reliable operation in electrically noisy factory floors. |
| Reinforced 6500VRMS isolation | Meets IEC 61010-1 safety requirements for measurement category CAT III 600V - certified for direct connection to industrial mains interfaces. |
Applications
| Industrial PLC Backplane Isolation | Motor Drive Fieldbus Interface |
|---|---|
Use Scenario: Isolating RS485 communication between CPU module and I/O expansion racks in modular PLC systems. IC Role / Device Role / Timing Role: Provides galvanic isolation and local 5V power for downstream I/O ASICs while maintaining 20Mbps diagnostic bandwidth. Use Value: Prevents ground loop currents from corrupting sensor readings and enables hot-swap capability without system reset. |
Use Scenario: Connecting variable frequency drives (VFDs) to central motion controllers via RS485 in multi-axis CNC machines. IC Role / Device Role / Timing Role: Acts as isolated RS485 transceiver with fast DE control to coordinate synchronized start/stop commands across drives. Use Value: Withstands 30kV/µs transients from IGBT switching noise, eliminating communication dropouts during acceleration/deceleration. |
| Energy Meter Data Concentrator | Railway Signaling Node |
Use Scenario: Aggregating consumption data from multiple smart meters over RS485 in medium-voltage substation metering cabinets. IC Role / Device Role / Timing Role: Serves as isolated interface with integrated 5V/1W supply powering metrology ADCs and real-time clocks on the meter side. Use Value: 14.6mm creepage satisfies IEC 62053-21 pollution degree 3 requirements for outdoor metering enclosures. |
Use Scenario: Interfacing trackside axle counters and signal relays to centralized interlocking systems via RS485 in EN 50121-3-2 compliant rail networks. IC Role / Device Role / Timing Role: Delivers reinforced 6500VRMS isolation to meet EN 50124-1 dielectric strength requirements for safety-critical signaling. Use Value: Certified UL1577 and CSA #5A compliance ensures acceptance in rail safety certification audits without additional test overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS485 isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO1540DR | 2500VRMS basic isolation; no integrated isolated power; SOIC-8 package | Suitable only for low-risk, low-voltage auxiliary links - cannot replace LTM2885IY#PBF where 6500VRMS or isolated power is required. | Choose when cost sensitivity outweighs safety rating and power integration needs. |
| ADM2483BRWZ | 2500VRMS reinforced isolation; no isolated power; 20Mbps; SOIC-16 package | Requires external isolated DC/DC for powered peripherals; lacks pin-selectable termination and 14.6mm creepage. | Select only if existing layout accommodates discrete isolated supply and termination resistors. |
Compared with ISO1540DR and ADM2483BRWZ, the LTM2885IY#PBF uniquely delivers 6500VRMS reinforced isolation, integrated 1W isolated power, and 14.6mm creepage in a single BGA package - reducing system-level certification effort and enabling compact, high-reliability fieldbus nodes in safety-critical infrastructure.
Availability
LTM2885IY#PBF is available at Aetrix Electronics and suitable for industrial automation, energy metering, and railway signaling applications requiring stable component supply, long-term lifecycle support, and certified high-voltage isolation performance.
Supply support for LTM2885IY#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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, automotive, and communications markets.
The LTM2885IY#PBF belongs to Analog Devices' µModule® isolator product line - engineered to deliver complete, safety-certified isolation solutions with integrated power and signal conditioning for demanding industrial fieldbus and data acquisition systems.
FAQ
What safety certifications does the LTM2885IY#PBF hold?
The LTM2885IY#PBF is certified to UL1577 (6500VRMS, 1s) and CSA Component Acceptance Notice #5A, with 100% production screening. It also meets partial discharge requirements per IEC 60747 and supports IEC 61010-1 CAT III 600V applications. These certifications apply directly to the LTM2885IY#PBF device as shipped and tested in its final BGA-42 package configuration.
Does the LTM2885IY#PBF require external components for basic RS485 operation?
No - the LTM2885IY#PBF requires zero external components for core RS485 functionality. All bypass capacitors, isolation transformers, LDOs, and termination resistors (when enabled via TERM pin) are integrated. Only VCC1, VCC2 load, and RS485 bus wiring are needed for operation - verified in DC1794 demonstration circuit design.
Can the LTM2885IY#PBF's isolated power supply drive an external ADC?
Yes - the LTM2885IY#PBF provides a regulated 5V output capable of delivering up to 200mA (1W), sufficient to power precision ADCs such as the LTC2378-20 or AD7606C-18. The LTM2885IY#PBF datasheet specifies load regulation and ripple performance under this condition, and AN125 confirms compatibility with metrology-grade converters.
How does the TERM pin function on the LTM2885IY#PBF?
The TERM pin on the LTM2885IY#PBF enables or disables an internal 120Ω termination resistor between A and B pins. When driven high, it activates termination for RS485 bus end-nodes; when low or floating, termination is disabled. This eliminates manual resistor placement and allows dynamic reconfiguration via GPIO - a feature confirmed in the LTM2885IY#PBF pin description table and DC1794 schematic.
What is the maximum common-mode transient immunity of the LTM2885IY#PBF?
The LTM2885IY#PBF guarantees 30kV/µs common-mode transient immunity, measured per IEC 61000-4-4. This value is validated across temperature and voltage conditions and ensures no data corruption or receiver malfunction during fast transients - a specification explicitly listed in the LTM2885IY#PBF product summary and isolation characteristics table.
LTM2885IY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 42-BBGA
- Packaging:
- Tray
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- RS422, RS485
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 6500Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs
- Data Rate:
- 20Mbps
- Propagation Delay tpLH / tpHL (Max):
- -
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 4ns, 4ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 42-BGA (22x9)
LTM2885IY#PBF FAQ
1.How can I place an order for LTM2885IY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2885IY#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 LTM2885IY#PBF reliable?
The price and inventory of LTM2885IY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2885IY#PBF is usually 5 days.
3.What payment methods are accepted for LTM2885IY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2885IY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2885IY#PBF?
LTM2885IY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2885IY#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 LTM2885IY#PBF?
For technical support, including LTM2885IY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2885IY#PBF requirements.
6.How does Aetrix verify that LTM2885IY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2885IY#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 LTM2885IY#PBF meets industry standards.
7.What is the process for return or replacement of LTM2885IY#PBF?
All LTM2885IY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2885IY#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 LTM2885IY#PBF part is unused and in its original packaging.
Return procedure for LTM2885IY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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