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Analog Devices Inc. LTM2881IY-5
- Part No.:
- LTM2881IY-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 32-BBGA Module
- Datasheet:
-
LTM2881IY-5.pdf
- Description:
- DGTL ISO 2.5KV RS422/RS485 32BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,250
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Product details
Overview
LTM2881IY-5 from Analog Devices (formerly Linear Technology) is a galvanically isolated full-duplex RS485/RS422 µModule transceiver with integrated 5V isolated DC/DC converter, 2500VRMS isolation rating, ±15kV HBM ESD protection on transceiver pins, and 30kV/µs common mode transient immunity. It operates from a 4.5V–5.5V logic-side supply and delivers up to 150mA at 5V on the isolated side, enabling robust industrial network interfaces in ground-loop-prone environments.
For engineers reviewing the LTM2881IY-5 datasheet, LTM2881IY-5 pinout, LTM2881IY-5 application, or LTM2881IY-5 equivalent, key selection criteria include its 20Mbps high-speed mode (or 250kbps slew-limited mode), selectable 120Ω termination, 1.62V–5.5V logic-level flexibility via VL pin, and BGA/LGA 32-pin 15mm × 11.25mm package with –40°C to +85°C operating range.
Technical Context
The LTM2881IY-5 implements bidirectional signal isolation using coreless transformer-based µModule technology with pulse encoding, error checking, and fail-safe shutdown. Its isolated DC/DC converter integrates transformer, full-bridge driver, voltage doubler rectification, and low-noise LDO regulation - requiring zero external components for 5V@150mA output.
It supports TIA/EIA-485-A and PROFIBUS compliance, features high-impedance failsafe RS485 receiver (≥96kΩ input resistance), current-limited drivers with thermal shutdown, and event-driven low-jitter DI/RO processing. The SLO pin selects between 20Mbps full-slew and 250kbps low-EMI operation, while TE enables/disables the integrated 120Ω A–B termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500VRMS for 1 minute - meets UL-CSA recognition (File #E151738) and ensures safety-critical barrier integrity in industrial systems. |
| Data Rate | 20Mbps (full-slew) or 250kbps (SLO mode) - supports high-speed fieldbus or low-EMI legacy networks without external filtering. |
| VCC2 Output | 5V at up to 150mA - powers external isolated circuitry (e.g., sensors, ADCs) without secondary converters. |
| Logic Supply Range | VL = 1.62V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, or 5V microcontrollers without level shifters. |
| Common Mode Immunity | ≥30kV/µs - maintains error-free communication during severe fast transients (e.g., motor switching, lightning surges). |
| ESD Protection | ±15kV HBM on A/B/Y/Z pins - eliminates need for external TVS diodes in harsh industrial environments. |
| Operating Temp | –40°C to +85°C (Industrial grade) - qualified for extended deployment in uncontrolled enclosures and outdoor nodes. |
Pinout & Package
Package: 32-pin BGA (15mm × 11.25mm × 3.42mm) or LGA (15mm × 11.25mm × 2.8mm); RoHS-compliant SAC305 ball/bump finish; MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main Logic Supply Input | 4.5V–5.5V input powering internal logic and DC/DC primary; internally bypassed with 2.2µF. |
| VL | Logic Interface Supply | 1.62V–5.5V supply for RO, RE, TE, DI, DE, DOUT, ON - sets I/O voltage levels independently of VCC. |
| GND | Logic-Side Ground Reference | Reference for VCC, VL, and all logic-side signals; must be connected to system logic ground plane. |
| ON | Global Enable Control | High enables isolated-side power and data transfer; low forces logic-side reset and disables VCC2 output. |
| DI | Driver Data Input | Direct logic-level input to RS485 driver; controls Y/Z polarity when DE = high. |
| DE | Driver Enable | High enables Y/Z outputs; low places them in high-impedance state (<10µA leakage over –7V to +12V). |
| RE | Receiver Enable | Low enables RO output; high forces RO into high-impedance state with <±1µA leakage. |
| RO | Receiver Data Output | CMOS-compatible output reflecting A–B polarity; failsafe-high when bus idle, open, or shorted. |
| TE | Termination Enable | High activates integrated 120Ω resistor between A and B - eliminates external termination components. |
| A, B | RS485 Differential Receiver Inputs | High-impedance (≥96kΩ), failsafe-enabled inputs compliant with RS485 common-mode range (–7V to +12V). |
| Y, Z | RS485 Differential Driver Outputs | Current-limited, thermally protected outputs; support RS485 (27Ω load) and RS422 (50Ω load) standards. |
| SLO | Slew Rate Control | Low relative to GND2 selects 250kbps low-EMI mode; high enables 20Mbps full-speed operation. |
| DIN | Isolated-Side Logic Input | Input referenced to VCC2/GND2; drives DOUT across isolation barrier with refresh and error detection. |
| DOUT | Isolated-Side Logic Output | Output referenced to VL/GND; high-impedance during isolation fault - prevents system-level latch-up. |
| VCC2 | Isolated 5V Output | Regulated 5V supply (150mA max) generated from VCC via integrated transformer and LDO; bypassed with 2.2µF. |
| GND2 | Isolated-Side Ground | Reference for VCC2, DIN, SLO, Y, Z, A, B; must be connected to cable shield or isolated node ground. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated DC/DC converter, decoupling caps (2.2µF each), and 120Ω termination eliminate BOM cost and layout risk. |
| Event-driven low-jitter DI/RO processing | Minimizes timing uncertainty in real-time industrial protocols (e.g., PROFIBUS-DP cycle times). |
| High-impedance failsafe receiver | Guarantees RO = high during bus idle/open/short - removes need for external bias resistors or pre-conditioning. |
| Thermal shutdown & current limiting | Protects against sustained short-circuits on Y/Z (±250mA limit) and overheating (>125°C junction shutdown). |
| UL-CSA recognized isolation | Meets safety certification requirements for industrial equipment without additional barrier validation effort. |
Applications
| Industrial Automation Networks | Isolated PROFIBUS-DP Nodes |
|---|---|
Use Scenario: Connecting PLCs, I/O modules, and HMIs over long RS485 daisy chains in factories with variable ground potentials. IC Role / Device Role / Timing Role: Galvanic isolator breaking ground loops while maintaining 20Mbps deterministic data exchange. Use Value: Eliminates communication errors caused by >10V ground differentials and >30kV/µs motor-drive transients. |
Use Scenario: Deploying certified PROFIBUS-DP slave devices in hazardous areas requiring reinforced insulation. IC Role / Device Role / Timing Role: Isolated transceiver meeting IEC 61158-2 physical layer specs with integrated 120Ω termination. Use Value: Reduces design validation time by embedding UL-CSA-recognized 2500VRMS isolation and failsafe operation. |
| RS485 Ground Loop Breakers | Modular Sensor Interface Modules |
Use Scenario: Retrofitting legacy RS485 field instruments (e.g., flow meters, temperature transmitters) into modern control systems. IC Role / Device Role / Timing Role: Drop-in isolation interface converting non-isolated RS485 ports to fully isolated ones with no PCB redesign. Use Value: Enables reuse of existing cabling and infrastructure while preventing noise injection from shared grounds. |
Use Scenario: Building compact, self-powered sensor nodes with isolated analog front-ends and digital outputs. IC Role / Device Role / Timing Role: Power + data isolator supplying 5V@150mA to external ADCs/sensors while relaying digitized data via RS485. Use Value: Integrates isolated power and communication in one 15mm × 11.25mm footprint - cuts board area vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated RS485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM2483BRWZ | 2500VRMS isolation, 16Mbps max, 2.7–5.5V VL range, no integrated DC/DC - requires external isolated supply. | Lower integration; suitable where isolated 5V rail already exists and board space allows discrete power solution. | Select ADM2483BRWZ when leveraging existing isolated power and prioritizing lower unit cost over system-level simplification. |
| ISO1540DR | 2500VRMS isolation, 1Mbps max, I²C interface (not RS485), 3.3V-only operation, integrated DC/DC (50mA). | Fundamentally different protocol interface - not an RS485 replacement; limited to low-speed digital isolation tasks. | ISO1540DR is not a functional alternative for RS485; consider only for non-RS485 isolated digital signaling needs. |
Compared with ADM2483BRWZ and ISO1540DR, the LTM2881IY-5 uniquely combines 20Mbps RS485 capability, integrated 5V/150mA isolated power, and programmable termination in a single µModule - reducing bill-of-materials count, layout complexity, and qualification effort for industrial fieldbus designs.
Availability
LTM2881IY-5 is available at Aetrix Electronics and suitable for industrial automation networks, isolated PROFIBUS-DP nodes, RS485 ground loop breakers, and modular sensor interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTM2881IY-5 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTM2881IY-5 belongs to Analog Devices' µModule isolated interface product line, engineered to simplify robust, certified isolation in harsh industrial environments - eliminating external components while meeting stringent safety and EMC requirements.
FAQ
What is the maximum continuous working voltage supported by the LTM2881IY-5?
The LTM2881IY-5 supports a maximum continuous working insulation voltage of 560VPEAK (400VRMS), validated per IEC 60664-1 for reinforced insulation in industrial applications. This rating applies across its full –40°C to +85°C operating range and ensures safe long-term operation in 480VAC three-phase systems with transient overvoltages.
Does the LTM2881IY-5 require external capacitors for its integrated DC/DC converter?
No, the LTM2881IY-5 does not require external capacitors for its isolated DC/DC converter. All necessary decoupling capacitance (2.2µF for VCC, VL, and VCC2) is integrated within the µModule package. External capacitors are optional only for enhanced thermal performance or ultra-low-noise applications.
How does the LTM2881IY-5 handle RS485 bus idle conditions?
The LTM2881IY-5 incorporates a high-impedance failsafe receiver that guarantees RO = high when the A–B differential voltage is below ±200mV - covering idle, open-circuit, shorted, or terminated-but-undriven bus states. This eliminates the need for external bias resistors and ensures deterministic logic levels without system-level intervention.
Can the LTM2881IY-5 operate with a 1.8V logic interface?
Yes, the LTM2881IY-5 supports 1.8V logic interfaces via its VL pin, which accepts 1.62V to 5.5V. At VL = 1.8V, VIH is guaranteed ≥1.35V and VIL ≤ 0.4V, ensuring reliable interfacing with 1.8V microcontrollers. RO output swings from GND to VL, and input thresholds scale accordingly.
What isolation certifications does the LTM2881IY-5 hold?
The LTM2881IY-5 is UL-CSA recognized (File #E151738) and carries CSA Component Acceptance Notice 5A. It achieves 2500VRMS dielectric withstand for 1 minute and meets IEC 60664-1 requirements for reinforced insulation, including CTI ≥600VRMS and creepage distance ≥9.48mm.
LTM2881IY-5 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:
- RS422, RS485
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 30kV/µs
- Data Rate:
- 20Mbps
- Propagation Delay tpLH / tpHL (Max):
- -
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-BGA (15x11.25)
LTM2881IY-5 FAQ
1.How can I place an order for LTM2881IY-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2881IY-5 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 LTM2881IY-5 reliable?
The price and inventory of LTM2881IY-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2881IY-5 is usually 5 days.
3.What payment methods are accepted for LTM2881IY-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2881IY-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2881IY-5?
LTM2881IY-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2881IY-5 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 LTM2881IY-5?
For technical support, including LTM2881IY-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2881IY-5 requirements.
6.How does Aetrix verify that LTM2881IY-5 is sourced from the original manufacturer or authorized distributors?
All LTM2881IY-5 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 LTM2881IY-5 meets industry standards.
7.What is the process for return or replacement of LTM2881IY-5?
All LTM2881IY-5 units undergo pre-shipment inspection (PSI). If there is an issue with LTM2881IY-5, 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 LTM2881IY-5 part is unused and in its original packaging.
Return procedure for LTM2881IY-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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