My Inquiry
My Account
Analog Devices Inc. LTM2881IV-3#PBF
- Part No.:
- LTM2881IV-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 32-BLGA
- Datasheet:
-
LTM2881IV-3#PBF.pdf
- Description:
- DGTL ISO 2.5KV RS422/RS485 32LGA
- Quantity:
- Payment:
- Shipping:
Inventory:515
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTM2881IV-3#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, 30kV/µs common mode transient immunity, and operation from –40°C to +85°C. It supports 20Mbps high-speed or 250kbps low-EMI slew-limited data rates, delivers up to 100mA isolated supply current, and features selectable 120Ω termination - ideal for industrial fieldbus nodes requiring ground-loop elimination and robust noise immunity.
For engineers reviewing the LTM2881IV-3#PBF datasheet, LTM2881IV-3#PBF pinout, LTM2881IV-3#PBF application, or LTM2881IV-3#PBF equivalent, key selection criteria include its LGA-32 package, 3.3V logic-side supply compatibility (VCC = 3.0–3.6V), 1.62–5.5V flexible VL interface, ±15kV HBM ESD protection on transceiver pins, and guaranteed 560VPEAK working voltage across the isolation barrier.
Technical Context
The LTM2881IV-3#PBF implements coreless transformer-based µModule isolation to simultaneously transfer power and bidirectional digital signals across a reinforced dielectric barrier. Its isolated DC/DC converter generates regulated 5V at up to 100mA from a 3.0–3.6V input, eliminating external magnetics or regulators.
Signal integrity is maintained via event-driven low-jitter processing for DI/RO paths, high-impedance failsafe RS485 receiver (≥96kΩ, supporting 256 nodes), and slew-rate control (SLO pin) enabling switchable 20Mbps/250kbps modes - all compliant with TIA/EIA-485-A and PROFIBUS standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500VRMS for 1 minute - meets UL-CSA recognition (File #E151738) and enables safe operation in 560VPEAK continuous working voltage systems. |
| Data Rate | 20Mbps (full-speed) or 250kbps (slew-limited) - selectable via SLO pin to reduce EMI in noisy industrial environments. |
| VCC Supply Range | 3.0V to 3.6V - matches standard 3.3V logic rails; internal 2.2µF bypassing eliminates need for external bulk capacitance. |
| VCC2 Output | 5.0V ±2.5%, up to 100mA - powers external circuitry on isolated side without additional converters. |
| Common Mode Immunity | ≥30kV/µs - ensures error-free communication during fast transients in motor drives or power electronics. |
| ESD Protection | ±15kV HBM on A/B/Y/Z pins - protects against handling damage and system-level electrostatic discharge events. |
| Logic Interface Voltage | VL = 1.62V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, or 5V microcontrollers without level shifters. |
Pinout & Package
Package: 32-pin LGA (15mm × 11.25mm × 2.8mm), RoHS-compliant Au finish, MSL Level 3, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DOUT (A1) | Isolated logic output | Reflects DIN state across barrier; enters high-impedance on isolation fault - provides fail-safe diagnostic path. |
| TE (A2) | Terminator enable | Logic-high activates integrated 120Ω A–B termination - eliminates external resistor placement and routing complexity. |
| DI (A3) | Driver input | Controls Y/Z differential outputs when DE = high; compatible with CMOS/TTL logic levels referenced to VL. |
| DE (A4) | Driver enable | Logic-high enables driver; logic-low places Y/Z in <10µA high-Z state - essential for half-duplex bus arbitration. |
| RE (A5) | Receiver enable | Logic-low enables RO output; logic-high forces RO into high-Z - enables multi-drop receiver sharing. |
| RO (A6) | Receiver output | CMOS-compatible output (VOH ≥ VL–0.4V, VOL ≤ 0.4V); failsafe-high when A/B open/shorted/terminated. |
| VL (A7) | Logic supply | Independent 1.62–5.5V rail for RO/RE/TE/DI/DE/DOUT/ON - decoupled internally with 2.2µF capacitor. |
| ON (A8) | Global enable | Logic-high powers both sides; logic-low resets logic side and disables VCC2 - enables system-level power sequencing. |
| VCC (B6–B8) | Main supply | 3.0–3.6V input powering internal DC/DC and logic; internally bypassed to GND. |
| GND (B1–B5) | Logic ground | Reference for VCC, VL, and all logic-side pins - must be separated from GND2 to maintain isolation integrity. |
| DIN (L1) | Isolated logic input | Accepts logic signals referenced to VCC2/GND2; drives DOUT across isolation barrier with low jitter. |
| SLO (L2) | Slew rate control | Low = 250kbps mode (reduced EMI); high = 20Mbps mode - software-controllable EMC optimization. |
| Y (L3) | Non-inverting driver | Active-high output in full-duplex mode; high-Z when DE = low - complies with RS485 differential signaling. |
| Z (L4) | Inverting driver | Complementary to Y; maintains tight skew (<8ns) for signal integrity at 20Mbps. |
| B (L5) | Inverting receiver input | High-impedance (>96kΩ) node; pairs with A for differential RS485/RS422 reception. |
| A (L6) | Non-inverting receiver input | Paired with B; supports common mode range of –7V to +12V relative to GND2. |
| VCC2 (L7–L8) | Isolated supply output | Regulated 5V output capable of sourcing 100mA - powers external isolators, sensors, or ADCs on bus side. |
| GND2 (K1–K8) | Isolated ground | Reference for VCC2, DIN, SLO, Y, Z, A, B - must connect to cable shield or isolated system ground. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated DC/DC transformer, 2.2µF internal bypass caps, and 120Ω termination eliminate BOM count and layout risk. |
| Event-driven low-jitter processing | DI-to-RO and DIN-to-DOUT propagation delay variation <8ns - preserves timing margins in deterministic real-time networks. |
| Failsafe RS485 receiver | Guaranteed logic-high RO output during idle, open, shorted, or terminated bus conditions - removes need for external bias resistors. |
| Current-limited drivers with thermal shutdown | Self-protects against Y/Z shorts to –7V/+12V; folds back current above ±10V to limit dissipation - enhances field reliability. |
| UL-CSA recognized isolation | Meets File #E151738 safety certification - simplifies end-equipment regulatory approval for industrial and medical applications. |
Applications
| Industrial PLC Backplane Communication | Isolated PROFIBUS-DP Node |
|---|---|
Use Scenario: Connecting I/O modules to a central controller over long RS485 daisy chains in factory automation cabinets with mixed grounding potentials. IC Role / Device Role / Timing Role: Galvanic isolator breaking ground loops between modules while maintaining 20Mbps deterministic data exchange and powering local sensor interfaces via VCC2. Use Value: Eliminates measurement errors and communication dropouts caused by >10V ground potential differences between chassis, verified under 30kV/µs transients. | Use Scenario: Implementing certified PROFIBUS-DP slave nodes in hazardous area gateways where intrinsic safety requires reinforced isolation barriers. IC Role / Device Role / Timing Role: RS485 transceiver + isolated power source meeting IEC 61158-2 physical layer requirements and UL-CSA safety standards. Use Value: Reduces certification effort by integrating 2500VRMS isolation, ±15kV ESD, and 560VPEAK working voltage in a single LGA package - no external isolation components needed. |
| Motor Drive Fieldbus Interface | Medical Equipment Isolated Data Link |
Use Scenario: Interfacing servo drives to motion controllers in CNC machines subject to high dv/dt noise from IGBT switching. IC Role / Device Role / Timing Role: High-CMTI RS485 transceiver suppressing common-mode noise coupling from power stages into control signals. Use Value: Maintains error-free communication during 30kV/µs transients induced by 1000V/µs bus voltage swings - prevents spurious drive faults or position loss. | Use Scenario: Isolating patient-connected monitoring devices (ECG, EEG) from hospital network infrastructure per IEC 60601-1 2×MOPP requirements. IC Role / Device Role / Timing Role: Reinforced isolation barrier separating SELV logic domain from patient-accessible circuits while transmitting waveform data. Use Value: Achieves 560VPEAK working voltage and CTI ≥600 VRMS - satisfies creepage (9.48mm) and DTI (0.06mm) requirements for 2×MOPP without custom layout. |
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-only isolated supply (no integrated DC/DC); 2500VRMS isolation; 500kbps max data rate; SOIC-16 package. | Requires external isolated power supply; lower data rate limits use in high-speed fieldbuses. | Select when board space permits discrete power design and 500kbps suffices - avoids µModule cost premium. |
| ISO1540DR | I²C isolator (not RS485); 2500VRMS; 1Mbps; SOIC-8; no integrated power. | Not functionally equivalent - lacks RS485 transceiver, driver/receiver, termination, or DC/DC capability. | Not a valid alternative for RS485 applications; only suitable for isolated I²C control links. |
Compared with ADM2483BRWZ and ISO1540DR, the LTM2881IV-3#PBF uniquely integrates isolated 5V/100mA power, 20Mbps RS485 transceiver, and programmable termination in one LGA package - reducing bill-of-materials, PCB area, and qualification effort for industrial and medical fieldbus designs.
Availability
LTM2881IV-3#PBF is available at Aetrix Electronics and suitable for industrial PLC backplanes, isolated PROFIBUS-DP nodes, motor drive fieldbus interfaces, medical equipment data links, and hazardous-area gateways requiring stable component supply and long-term lifecycle support.
Supply support for LTM2881IV-3#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTM2881IV-3#PBF belongs to the µModule isolated interface product line, engineered to simplify system-level isolation by integrating signal transceivers, power conversion, and safety-certified barriers - targeting industrial automation, energy infrastructure, and healthcare equipment.
FAQ
What is the maximum continuous working voltage rating for the LTM2881IV-3#PBF?
The LTM2881IV-3#PBF has a maximum continuous working voltage rating of 560VPEAK across its isolation barrier, validated per IEC 60664-1 and supported by 9.48mm creepage and 0.06mm distance through insulation (DTI). This enables use in 400VRMS industrial mains-connected systems without additional reinforcement.
Does the LTM2881IV-3#PBF require external capacitors for its integrated DC/DC converter?
No, the LTM2881IV-3#PBF does not require external capacitors for its isolated DC/DC converter. The 2.2µF bypass capacitors for VCC, VL, and VCC2 are integrated within the µModule package. Only optional external ceramic capacitors (e.g., 10µF X5R) are recommended for enhanced transient response on VCC2.
How does the SLO pin affect data rate and EMI performance in the LTM2881IV-3#PBF?
When the SLO pin is pulled low to GND2, the LTM2881IV-3#PBF enters slew-limited mode, capping data rate at 250kbps and reducing high-frequency harmonics by >20dB (per Figures 9a/9b). When SLO is high, full 20Mbps operation is enabled - allowing dynamic EMI optimization based on cable length and noise environment.
Can the LTM2881IV-3#PBF power external circuitry using its VCC2 output?
Yes, the LTM2881IV-3#PBF's VCC2 pin delivers a regulated 5.0V output capable of supplying up to 100mA. After powering the internal RS485 transceiver (typically 30–50mA), surplus current (up to ~60mA) is available for external loads such as isolated ADCs, temperature sensors, or optocoupler drivers - verified across –40°C to +85°C.
What is the receiver input resistance of the LTM2881IV-3#PBF, and how many nodes can it support?
The LTM2881IV-3#PBF receiver exhibits ≥96kΩ input resistance per A or B pin (at –40°C to +85°C), enabling up to 256 unit loads on a single RS485 bus per TIA/EIA-485-A specification. This high impedance remains stable regardless of TE, RE, or ON pin states - ensuring predictable bus loading in multi-drop configurations.
LTM2881IV-3#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:
- 3V ~ 3.6V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LGA (15x11.25)
LTM2881IV-3#PBF FAQ
1.How can I place an order for LTM2881IV-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2881IV-3#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 LTM2881IV-3#PBF reliable?
The price and inventory of LTM2881IV-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2881IV-3#PBF is usually 5 days.
3.What payment methods are accepted for LTM2881IV-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2881IV-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2881IV-3#PBF?
LTM2881IV-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2881IV-3#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 LTM2881IV-3#PBF?
For technical support, including LTM2881IV-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2881IV-3#PBF requirements.
6.How does Aetrix verify that LTM2881IV-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2881IV-3#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 LTM2881IV-3#PBF meets industry standards.
7.What is the process for return or replacement of LTM2881IV-3#PBF?
All LTM2881IV-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2881IV-3#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 LTM2881IV-3#PBF part is unused and in its original packaging.
Return procedure for LTM2881IV-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTM2881IV-3#PBF Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
