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Analog Devices Inc. LTM2881HY-5
- Part No.:
- LTM2881HY-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 32-BBGA Module
- Datasheet:
-
LTM2881HY-5.pdf
- Description:
- DGTL ISO 2.5KV RS422/RS485 32BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,166
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Product details
Overview
LTM2881HY-5 from Analog Devices (formerly Linear Technology) is a galvanically isolated full-duplex RS485/RS422 µModule transceiver with integrated 5V isolated DC/DC converter delivering up to 150mA, 2500VRMS isolation rating, ±15kV HBM ESD protection on transceiver pins, and 30kV/μs common-mode transient immunity - deployed in industrial automation networks requiring ground-loop elimination and robust noise immunity.
For engineers reviewing the LTM2881HY-5 datasheet, LTM2881HY-5 pinout, LTM2881HY-5 application, or LTM2881HY-5 equivalent, this page delivers verified technical context, exact pin functions per side (logic/isolated), confirmed 32-pin BGA/LGA package mapping, real-world slew-rate mode trade-offs (20Mbps vs 250kbps), and validated alternatives for isolated RS485 interface design.
Technical Context
The LTM2881HY-5 implements coreless transformer-based µModule isolation for both signal and power transfer across a single barrier, supporting event-driven low-jitter DI→RO and DIN→DOUT paths. Its integrated DC/DC converter uses a 2MHz full-bridge driver with series DC-blocking capacitor and voltage-doubler rectification to deliver regulated 5V at up to 150mA without external magnetics.
It features dual-domain logic interfacing: VL pin supports 1.62V–5.5V I/O levels independent of VCC (4.5–5.5V), while SLO pin selects between full-speed (20Mbps) and slew-limited (250kbps) driver operation. Receiver input impedance exceeds 96kΩ (256-node bus support), with failsafe threshold (–0.2V to 0V) and 25mV hysteresis guaranteed over –7V to +12V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VISO | 2500VRMS for 1 minute - enables safety-certified isolation in industrial PLC backplanes and motor drives. |
| Data Rate | 20Mbps (full speed) or 250kbps (slew-limited) - selectable via SLO pin to meet EMI requirements without layout changes. |
| VCC2 Output | 5V at up to 150mA - powers external isolated peripherals (e.g., sensors, ADCs) without secondary DC/DC stage. |
| Common-Mode Immunity | ≥30kV/μs - maintains error-free communication during fast transients in factory-floor environments. |
| ESD Protection | ±15kV HBM on A/B/Y/Z pins - eliminates need for external TVS diodes on RS485 lines. |
| Logic Supply Range | VL = 1.62V to 5.5V - interfaces directly with 1.8V, 3.3V, or 5V microcontrollers without level shifters. |
| Operating Temp | –40°C to +105°C (H-grade) - qualified for under-hood automotive gateways and harsh industrial enclosures. |
Pinout & Package
Package: 32-pin BGA or LGA, 15mm × 11.25mm × 3.42mm (BGA) / 2.8mm (LGA), MSL 3, SnPb (e0) or SAC305 (e1) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (DOUT) | Isolated-side logic output | Reflects DIN state across barrier; high-impedance during isolation fault - enables fail-safe monitoring of communication integrity. |
| A2 (TE) | Terminator enable | Logic-high enables internal 120Ω A–B termination - eliminates external resistor placement and routing on PCB. |
| A3 (DI) | Driver input | Controls Y/Z outputs when DE = high; compatible with CMOS/TTL logic levels referenced to VL. |
| A4 (DE) | Driver enable | Low disables Y/Z (high-Z); prevents bus contention in multi-drop configurations. |
| A5 (RE) | Receiver enable | Low enables RO; high forces RO into high-Z - supports half-duplex bus sharing. |
| A6 (RO) | Receiver output | Active-high logic output reflecting A–B polarity; failsafe-high when bus idle/open/shorted - removes need for external pull-ups. |
| A7 (VL) | Logic supply | Defines voltage domain for RO/RE/TE/DI/DE/DOUT/ON; decoupled internally with 2.2µF - simplifies power routing. |
| A8 (ON) | Global enable | High activates isolation barrier, DC/DC, and transceiver; low resets logic side and powers down isolated side - enables system-level sleep control. |
| B1–B5 (GND) | Logic-side ground | Reference for VCC, VL, and logic pins; must be separated from GND2 to maintain isolation integrity. |
| B6–B8 (VCC) | Main supply | 4.5–5.5V input powering logic side and DC/DC primary; internally bypassed with 2.2µF - no external capacitor required. |
| L1 (DIN) | Isolated-side logic input | Drives DOUT across barrier; referenced to VCC2/GND2 - enables bidirectional control of external isolated circuitry. |
| L2 (SLO) | Slew rate control | Low → 250kbps mode (reduced EMI); high → 20Mbps mode - software-selectable EMC optimization. |
| L3 (Y) | Non-inverting driver output | RS485/RS422 compliant differential output; current-limited and thermally protected - survives cable shorts to ±15V. |
| L4 (Z) | Inverting driver output | Complementary to Y; matched skew (<8ns) ensures clean differential signaling at 20Mbps. |
| L5 (B) | Inverting receiver input | High-impedance (>96kΩ) RS485 input; failsafe active across full –7V to +12V common-mode range. |
| L6 (A) | Non-inverting receiver input | Paired with B; differential threshold ±200mV with 25mV hysteresis - rejects noise on long cables. |
| L7–L8 (VCC2) | Isolated 5V output | Regulated 5V supply for isolated peripherals; 150mA max load - replaces discrete isolated DC/DC in space-constrained designs. |
| K1–K8 (GND2) | Isolated-side ground | Reference for VCC2, DIN, SLO, Y, Z, A, B; connects to cable shield or isolated subsystem ground. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5V/150mA isolated DC/DC | Eliminates external transformer, controller, and regulation circuitry - reduces BOM count by ≥12 components. |
| Selectably terminated RS485 bus (120Ω) | TE pin enables/disables termination on-the-fly - avoids manual jumpering or firmware rework during network topology changes. |
| Failsafe receiver with >96kΩ input impedance | Guarantees RO = high during open/idle/bus-short conditions - removes external bias resistors and improves reliability in noisy plants. |
| Event-driven low-jitter data path | DI→RO propagation delay <140ns with <8ns skew - preserves timing margins in deterministic real-time networks (e.g., PROFIBUS-DP). |
| Thermal shutdown + current-limited drivers | Prevents latch-up or damage during sustained Y/Z short-circuits - enables unattended operation in inaccessible locations. |
Applications
| Industrial Automation Network | Isolated PROFIBUS-DP Node |
|---|---|
Use Scenario: Connecting PLC I/O modules across different ground domains in a manufacturing cell with variable earth potentials. IC Role / Device Role / Timing Role: Galvanic isolator breaking ground loops while maintaining 20Mbps full-duplex RS485 communication between master and slave nodes. Use Value: Prevents measurement errors and communication dropouts caused by >30kV/μs transients from nearby VFDs or welding equipment. | Use Scenario: Implementing a certified PROFIBUS-DP slave device in a hazardous area enclosure requiring reinforced isolation. IC Role / Device Role / Timing Role: Isolated transceiver meeting TIA/EIA-485-A and PROFIBUS physical layer specs with 2500VRMS dielectric strength. Use Value: Achieves UL-CSA recognition (File #E151738) and eliminates need for external isolation certification testing. |
| Motor Drive Communication Interface | Remote Sensor Hub with Local Power |
Use Scenario: Linking a servo drive's RS485 port to a central motion controller in an environment with high dv/dt noise from IGBT switching. IC Role / Device Role / Timing Role: High-CMTI isolator ensuring uninterrupted command transmission despite 30kV/μs common-mode spikes on motor cabling. Use Value: Maintains position loop integrity and prevents spurious drive faults triggered by ground-bounce-induced bit errors. | Use Scenario: Powering and communicating with isolated temperature/pressure sensors mounted on rotating machinery. IC Role / Device Role / Timing Role: Dual-function device providing 5V/150mA isolated power (VCC2) and RS485 data link through single µModule package. Use Value: Reduces interconnect complexity by eliminating separate isolated DC/DC converter - saves >200mm² PCB area. |
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 | 3.3V logic supply only; 2.5kVRMS isolation; no integrated DC/DC; requires external 3.3V isolated supply | Lower power budget (≤100mA isolated supply needed); less board area but higher system-level BOM cost | Choose when existing isolated 3.3V rail is available and thermal constraints limit µModule height. |
| ISO1540DR | I²C isolator (not RS485); 5000VRMS; 1Mbps max; no transceiver or DC/DC | Only suitable for digital control signaling - cannot replace RS485 physical layer functionality | Not a functional alternative; included only for isolation architecture comparison where protocol translation is feasible. |
Compared with ADM2483BRWZ, LTM2881HY-5 integrates power and signal isolation in one package, eliminating external DC/DC design effort and reducing total solution size by ~40%, while offering higher CMTI and wider VL range. ISO1540DR serves a fundamentally different interface protocol and cannot substitute for RS485 transceiver functionality.
Availability
LTM2881HY-5 is available at Aetrix Electronics and suitable for industrial automation networks, isolated PROFIBUS-DP nodes, and motor drive communication interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTM2881HY-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 LTM2881HY-5 belongs to the µModule isolated interface product line, engineered to simplify robust, safety-compliant isolation design by integrating signal transceivers, power conversion, and protection circuitry into compact, pre-tested packages for harsh electromagnetic environments.
FAQ
What is the maximum continuous working voltage rating for LTM2881HY-5?
The LTM2881HY-5 has a maximum continuous working insulation voltage (VIORM) of 560VPEAK, validated per IEC 60664-1 for reinforced insulation in industrial applications. This rating applies across the full –40°C to +105°C operating range and supports use in 480VAC motor control systems with appropriate creepage/clearance layout.
Does LTM2881HY-5 require external decoupling capacitors?
No - the LTM2881HY-5 integrates 2.2µF capacitors internally for VCC-to-GND, VL-to-GND, and VCC2-to-GND2 decoupling. External capacitors are not required for basic operation, though optional 10µF ceramic caps may be added at VCC2 for high-current transient loads.
How does the SLO pin affect data rate and EMI in LTM2881HY-5?
When SLO is pulled low to GND2, the LTM2881HY-5 enters slew-limited mode, reducing maximum data rate to 250kbps and suppressing high-frequency harmonics (e.g., >5MHz) by >20dB - demonstrated in Figures 9a/9b of the datasheet. This mode is ideal for EMI-sensitive medical or test equipment.
Can LTM2881HY-5 support 256-node RS485 buses?
Yes - the LTM2881HY-5 receiver input resistance exceeds 96kΩ (per A or B pin), enabling up to 256 unit loads on a single RS485 bus per TIA/EIA-485-A standard. At H-grade temperature extremes (–40°C to +105°C), input resistance drops to 48kΩ, supporting 128 nodes.
What happens to RO and DOUT during an isolation barrier failure in LTM2881HY-5?
During isolation communication failure, both RO and DOUT enter high-impedance states with leakage <±1µA - a built-in fail-safe behavior documented in the Pin Functions section. This prevents undefined logic states from propagating to downstream circuitry and aids system-level fault diagnosis.
LTM2881HY-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 ~ 105°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-BGA (15x11.25)
LTM2881HY-5 FAQ
1.How can I place an order for LTM2881HY-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2881HY-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 LTM2881HY-5 reliable?
The price and inventory of LTM2881HY-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2881HY-5 is usually 5 days.
3.What payment methods are accepted for LTM2881HY-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2881HY-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2881HY-5?
LTM2881HY-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2881HY-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 LTM2881HY-5?
For technical support, including LTM2881HY-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2881HY-5 requirements.
6.How does Aetrix verify that LTM2881HY-5 is sourced from the original manufacturer or authorized distributors?
All LTM2881HY-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 LTM2881HY-5 meets industry standards.
7.What is the process for return or replacement of LTM2881HY-5?
All LTM2881HY-5 units undergo pre-shipment inspection (PSI). If there is an issue with LTM2881HY-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 LTM2881HY-5 part is unused and in its original packaging.
Return procedure for LTM2881HY-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTM2881HY-5 Tags
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