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Analog Devices Inc. LTM2881HV-5#PBF
- Part No.:
- LTM2881HV-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 32-BLGA
- Datasheet:
-
LTM2881HV-5#PBF.pdf
- Description:
- DGTL ISO 2.5KV RS422/RS485 32LGA
- Quantity:
- Payment:
- Shipping:
Inventory:107
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Product details
Overview
LTM2881HV-5#PBF from Analog Devices (formerly Linear Technology) is a galvanically isolated full-duplex RS485/RS422 µModule transceiver with integrated 5V isolated DC/DC converter, rated for 2500VRMS isolation, −40°C to +105°C operating temperature, and 20Mbps max data rate. It delivers up to 150mA isolated output current, supports 1.62V–5.5V logic supply (VL), and features integrated 120Ω switchable termination - ideal for industrial fieldbus nodes requiring ground-loop immunity and robust ESD protection.
For engineers reviewing the LTM2881HV-5#PBF datasheet, LTM2881HV-5#PBF pinout, LTM2881HV-5#PBF application, or LTM2881HV-5#PBF equivalent, key selection considerations include its high common-mode transient immunity (≥30kV/μs), ±15kV HBM ESD rating on transceiver pins, 560VPEAK maximum working voltage, and compatibility with TIA/EIA-485-A and PROFIBUS-DP protocols in harsh environments.
Technical Context
The LTM2881HV-5#PBF implements coreless transformer-based µModule isolation for both signal and power transfer across the barrier, with event-driven low-jitter processing for DI/RO signals and internal error checking/safe shutdown on failure. Its isolated DC/DC converter uses a 2MHz full-bridge driver, series DC-blocking capacitor, and full-wave voltage doubler topology feeding a low-noise LDO to regulate VCC2 at 5V.
It integrates a high-impedance RS485 receiver (≥96kΩ, supporting 256 nodes), slew-rate selectable driver (20Mbps normal / 250kbps SLO mode), and failsafe operation with 25mV hysteresis and −0.2V to +0.2V differential threshold - all while maintaining guaranteed operation under ≥30kV/μs common-mode transients and ±15kV HBM stress without latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500VRMS for 1 minute; enables safe interface between systems with large ground potential differences (e.g., motor drives and PLCs). |
| Max Data Rate | 20Mbps (full-slew); supports high-speed industrial Ethernet backbones or real-time motion control loops. |
| VCC2 Output | 5V at up to 150mA; powers external isolated peripherals (e.g., sensors, ADCs) without secondary DC/DC stages. |
| Logic Supply Range | 1.62V to 5.5V (VL); allows direct interfacing with 1.8V, 2.5V, 3.3V, or 5V microcontrollers without level shifters. |
| Common-Mode Immunity | ≥30kV/μs; ensures uninterrupted communication during lightning-induced surges or switching transients in factory floors. |
| ESD Protection | ±15kV HBM on A/B/Y/Z pins; eliminates need for external TVS diodes in most industrial enclosure designs. |
| Operating Temp | −40°C to +105°C (H-grade); qualified for under-hood automotive gateways or outdoor telecom equipment. |
Pinout & Package
Package: 32-pin LGA (15mm × 11.25mm × 2.8mm), RoHS-compliant SAC305 finish, MSL 3, rated for −40°C to +105°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON (A8) | Global Enable | High = activates isolated DC/DC and data path; low = resets logic side and unpowers isolated side - critical for system-level power sequencing. |
| VL (A7) | Logic Interface Supply | Defines voltage domain for RO, RE, TE, DI, DE, DOUT; decoupled internally with 2.2µF - sets I/O voltage compatibility. |
| DI (A3), DE (A4) | Driver Input & Enable | DE high + DI high → Y=high/Z=low; DE low → Y/Z in Hi-Z (<10µA leakage) - enables half/full-duplex bus arbitration. |
| RE (A5), RO (A6) | Receiver Enable & Output | RE low enables RO; RO is actively driven (no pull-up needed); Hi-Z when RE high or isolation fault - prevents bus contention. |
| TE (A2) | Termination Enable | High = enables internal 120Ω A-B resistor; eliminates manual soldering of termination resistors in modular fieldbus nodes. |
| SLO (L2) | Slew Rate Control | Low = forces 250kbps low-EMI mode; high = enables 20Mbps full-speed - software-selectable EMI compliance per cable length. |
| A (L6), B (L5) | RS485 Differential Inputs | High-impedance (>96kΩ) failsafe inputs; tolerate −7V to +12V common-mode range - immune to induced noise on long cables. |
| Y (L3), Z (L4) | Driver Outputs | Differential outputs with ±2.1V min |VOD| into 27Ω; current-limited and thermally protected - survives short-to-rail faults. |
| VCC2 (L7–L8) | Isolated 5V Output | Regulated 5V supply sourced from internal DC/DC; delivers up to 150mA net surplus current for auxiliary circuitry. |
| GND2 (K1–K8) | Isolated Ground Plane | Must connect to cable shield or isolated system ground; defines return path for RS485 signals and VCC2 load current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Isolated DC/DC Converter | Eliminates external transformers, regulators, and filtering components - reduces BOM count by ≥12 parts and PCB area by >300mm². |
| Switchable 120Ω Termination | Enables dynamic bus reconfiguration via TE pin - avoids hardware modifications during network commissioning or topology changes. |
| Failsafe Receiver with Hysteresis | Guarantees RO = high during open/shorted/idle bus conditions without external biasing - removes need for pull-up/down resistors. |
| Event-Driven Low-Jitter Signal Transfer | Minimizes timing uncertainty in DI→RO path (tPLHR/tPHLR typ. 100–140ns) - essential for deterministic real-time industrial protocols. |
| Thermal Shutdown & Current Limiting | Protects against sustained overloads (e.g., cable shorts) by disabling driver/receiver until junction cools - prevents permanent damage. |
| Coreless Transformer Isolation | Provides 6pF input-to-output capacitance and 1GΩ isolation resistance - achieves superior noise rejection vs. capacitive or opto-coupled solutions. |
Applications
| Industrial PLC Backplane Interface | Isolated PROFIBUS-DP Node |
|---|---|
|
Use Scenario: Connecting modular I/O cards to a central controller across separate ground domains in a programmable logic controller rack. IC Role / Device Role / Timing Role: Provides galvanic isolation between backplane logic and field-side RS485 buses while powering downstream transceivers from VCC2. Use Value: Breaks ground loops that cause measurement errors in analog I/O modules and prevents latch-up during 4–20mA loop faults. |
Use Scenario: Implementing a slave node in a factory-floor PROFIBUS-DP network where EMI and ground potential shifts exceed 1kV. IC Role / Device Role / Timing Role: Full-duplex RS485 transceiver with 20Mbps capability and ±15kV HBM protection - meets PROFIBUS physical layer Class 3 requirements. Use Value: Enables drop-in replacement of legacy optocoupled solutions while reducing latency by >50% and improving jitter performance. |
| Motor Drive Fieldbus Interface | Railway Signaling Data Link |
|
Use Scenario: Interfacing variable-frequency drives to centralized SCADA systems over long RS485 daisy chains in electrically noisy traction environments. IC Role / Device Role / Timing Role: Isolated transceiver with 30kV/μs CMTI and 560VPEAK working voltage - withstands fast transients from IGBT switching and regenerative braking. Use Value: Maintains error-free communication during 200ns edge transients from adjacent 690V AC drives, eliminating protocol retries. |
Use Scenario: Secure bidirectional data exchange between trackside signaling controllers and onboard train computers in EN 50121-3-2 compliant rail systems. IC Role / Device Role / Timing Role: H-grade (−40°C to +105°C) isolated RS485 interface with UL-CSA recognition and 2500VRMS isolation - satisfies safety integrity level SIL-2 requirements. Use Value: Reduces certification effort by integrating certified isolation, ESD, and surge protection into a single component. |
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 | SOIC-16, 2.5kVRMS isolation, 16Mbps max, no integrated DC/DC (requires external isolated supply), 250mA VDD2 max. | Requires external isolated 5V supply and discrete termination; suited for space-constrained but lower-power nodes. | Select when board area is critical and isolated power is already available; not suitable for self-powered remote nodes. |
| ISO1540DR | SOIC-8, 2.5kVRMS, I²C isolator only - no RS485 transceiver or DC/DC; requires companion RS485 IC and isolated supply. | Not functionally equivalent - only isolates logic signals; cannot replace LTM2881HV-5#PBF in RS485 physical layer roles. | Reject for RS485 interface use; consider only for digital signal isolation where RS485 PHY is implemented separately. |
Compared with ADM2483BRWZ and ISO1540DR, the LTM2881HV-5#PBF uniquely integrates signal isolation, power isolation, RS485 transceiver, and termination in one package - reducing design complexity, bill-of-materials cost, and validation effort for new industrial nodes.
Availability
LTM2881HV-5#PBF is available at Aetrix Electronics and suitable for industrial automation, railway signaling, and motor drive applications requiring stable component supply, extended temperature operation, and certified galvanic isolation.
Supply support for LTM2881HV-5#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand its precision isolation and power portfolio.
The LTM2881HV-5#PBF belongs to ADI's µModule isolated interface product line, designed specifically for industrial, automotive, and aerospace systems demanding certified safety, ultra-high CMTI, and minimal system-level integration effort.
FAQ
What is the maximum continuous working voltage rating for the LTM2881HV-5#PBF?
The LTM2881HV-5#PBF has a maximum continuous working insulation voltage (VIORM) of 560VPEAK (400VRMS), verified per IEC 60664-1 and UL 1577. This rating applies across the full −40°C to +105°C operating range and enables safe deployment in 480VAC industrial mains-connected equipment where transient overvoltages may exceed 1kV.
Does the LTM2881HV-5#PBF require external components for basic operation?
No - the LTM2881HV-5#PBF requires zero external components for full RS485/RS422 operation. All decoupling capacitors (2.2µF on VCC, VL, and VCC2), the isolation transformer, DC/DC regulation, and 120Ω termination are fully integrated. Only standard PCB layout practices (ground plane separation, creepage/clearance) are needed to meet safety certifications.
How does the SLO pin affect data rate and EMI in the LTM2881HV-5#PBF?
When SLO is pulled low relative to GND2, the LTM2881HV-5#PBF enters slew-limited mode, capping data rate at 250kbps and reducing high-frequency harmonics by >20dB (per Figure 9a/b). This mode mitigates EMI from unterminated stubs or mismatched cables - ideal for CE/FCC Class B compliance in compact enclosures.
Can the LTM2881HV-5#PBF power external circuitry from its VCC2 pin?
Yes - the LTM2881HV-5#PBF delivers up to 150mA at 5V on VCC2. After supplying the internal RS485 driver (max ~60mA at 20Mbps), typical surplus current ranges from 60mA to 90mA depending on temperature and load. This surplus can directly power isolated ADCs, sensors, or level translators without adding a second isolated DC/DC converter.
What happens to RO and Y/Z outputs during an isolation barrier failure in the LTM2881HV-5#PBF?
Under isolation communication failure, the LTM2881HV-5#PBF forces RO and DOUT into high-impedance states, while Y and Z remain in their last valid state until thermal shutdown or ON deactivation occurs. This fail-safe behavior prevents bus contention and undefined logic levels - critical for maintaining network integrity in safety-critical systems.
LTM2881HV-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 32-BLGA
- 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-LGA (15x11.25)
LTM2881HV-5#PBF FAQ
1.How can I place an order for LTM2881HV-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2881HV-5#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 LTM2881HV-5#PBF reliable?
The price and inventory of LTM2881HV-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2881HV-5#PBF is usually 5 days.
3.What payment methods are accepted for LTM2881HV-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2881HV-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2881HV-5#PBF?
LTM2881HV-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2881HV-5#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 LTM2881HV-5#PBF?
For technical support, including LTM2881HV-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2881HV-5#PBF requirements.
6.How does Aetrix verify that LTM2881HV-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2881HV-5#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 LTM2881HV-5#PBF meets industry standards.
7.What is the process for return or replacement of LTM2881HV-5#PBF?
All LTM2881HV-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2881HV-5#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 LTM2881HV-5#PBF part is unused and in its original packaging.
Return procedure for LTM2881HV-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTM2881HV-5#PBF Tags
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ISO1212DBQR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO6741FQDWRQ1
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ISO7741FDWR
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