LTC2863IS8-1 - ±60V Fault-Protected RS485/RS422 Transceiver | ADI
Teilenummer: LTC2863IS8-1 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $6.48 | $6,48 |
| 10 | $5.83 | $58,30 |
| 100 | $5.18 | $518,00 |
| 500 | $4.53 | $2.265,00 |
| 1.000 | $3.89 | $3.890,00 |
| 2.500 | $3.24 | $8.100,00 |
LTC2863IS8-1 Übersicht
A transceiver is a semiconductor device that bridges two distinct electrical interfaces, in this case translating between low-voltage CMOS logic on the controller side and the differential, bus-terminated signaling required by the RS485/RS422 standard. RS485/RS422 transceivers sit inside the broader interface-IC hierarchy: interface IC > line driver/receiver > differential transceiver > RS485/RS422 transceiver. The LTC2863 family is positioned for harsh industrial bus networks where hot-plug events, wiring faults, and surge exposure are routine.
Key features include ±60V fault protection on driver outputs and receiver inputs, ±25V HBM ESD protection on the bus pins, 1/8 unit load (up to 256 nodes per bus), current-limited drivers with thermal shutdown, and a fully balanced differential receiver threshold that minimizes duty-cycle distortion. The -1 suffix denotes the full-duplex (no shared DE/RE control timing constraint) pinout variant in the 8-lead SOIC; the -2 variant differs in enable logic. Per the manufacturer datasheet, MP-grade (-55°C to 125°C) and DFN package options are also available in the LTC2863 family.
Architecturally, the device combines a differential line driver with a wide-input-range differential receiver, both protected by on-chip TVS-style clamping structures. The 3V-5.5V VCC range allows direct connection to 3.3V or 5V microcontrollers without level shifters, simplifying BOM and reducing board area. Pin compatibility with the LT1785 and LT1791 families (per Analog Devices product page) means existing designs can be ruggedized against field faults with no layout rework.
Typical applications include industrial fieldbus networks (Modbus, Profibus, BACnet), building automation, motor drive feedback links, smart-grid metering, and any long-cable RS485 link exposed to installation transients or mis-wiring. The ±60V tolerance protects against accidental AC mains contact on the bus.
When laying out the LTC2863IS8-1, keep the bus traces short and matched, place the bus termination at the end nodes, and provide a solid ground plane; the IC's internal fault protection does not replace good EMC practice. Use a 100nF decoupling capacitor close to VCC and add a 10µF bulk capacitor if the supply is shared with switching regulators.
Drop-in-Alternativen für LTC2863IS8-1 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
LTC2863IS8-2
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
LTC2862IS8-1
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
LTC2864IS8-1
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
LT1785IS8
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SN65HVD75DR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX3485ESA
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LTC2863IS8-1 Technische Daten
| Manufacturer | Analog Devices Inc. (formerly Linear Technology) |
| Part Number | LTC2863IS8-1#PBF |
| Funktion | 1/1 Transceiver, Full-Duplex |
| Protocol | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 |
| Supply Voltage (VCC) | 3 V to 5.5 V |
| Fault Protection (Bus Pins) | ±60 V |
| ESD Protection (Bus Pins, HBM) | ±25 kV |
| Receiver Input Load | 1/8 unit load (up to 256 receivers per bus) |
| Gehäuse / Bauform | 8-SOIC (0.154", 3.90 mm width) |
| Betriebstemperaturbereich | -40°C to +85°C (I grade) |
| MP-Grade Option | -55°C to +125°C (separate part number) |
| Packaging | Tube (#PBF = lead-free Pb-free finish) |
| Lead-Free / RoHS | Yes (Pb-free finish per #PBF suffix) |
| Montageart | Surface Mount |
| Pin-Compatible Family | Pin compatible with LT1785 and LT1791 (per Analog Devices product page) |
| ECCN | EAR99 |
LTC2863IS8-1 Pin-Konfiguration
| Pin 1 | RO — Receiver Output (CMOS logic level to MCU UART RX) |
| Pin 2 | RE# — Receiver Enable (active-low; tie to GND to enable receiver) |
| Pin 3 | DE — Driver Enable (active-high; tie to VCC to enable driver) |
| Pin 4 | DI — Driver Input (CMOS logic level from MCU UART TX) |
| Pin 5 | GND — Ground reference |
| Pin 6 | Y — Driver Non-Inverting Differential Output (to bus Y/A) |
| Pin 7 | Z — Driver Inverting Differential Output (to bus Z/B) |
| Pin 8 | VCC — Supply voltage input (3 V to 5.5 V) |
Typische Anwendungen
LTC2863IS8-1 ist geeignet für 6 Anwendungs: Industrial Fieldbus Networks (Modbus, Profibus), Building Automation (BACnet MS-TP, LonWorks), Motor Drive Feedback Link, Smart-Grid Energy Metering, Access Control and Security Panel Networks, Renewable Energy Inverter Communication.
Industrial Fieldbus Networks (Modbus, Profibus)
The LTC2863IS8-1 fits industrial fieldbus networks because its ±60V bus fault protection survives accidental AC mains contact during installation, a common failure mode in factory cabinets. With ±25kV HBM ESD on the bus pins, it tolerates the electrostatic discharge that occurs when technicians handle ungrounded cabling. The 1/8 unit load allows up to 256 nodes per segment, dense enough for large PLC and sensor networks. Placed between the MCU UART and the fieldbus connector, it converts 3.3V or 5V CMOS logic to TIA-485-A differential signaling; unlike a basic transceiver it does not require external TVS diodes for fault protection, reducing BOM cost by approximately $0.20 per node.
Empfohlen
Building Automation (BACnet MS-TP, LonWorks)
The LTC2863IS8-1 is well-suited for BACnet MS-TP building-automation networks because the standard runs at 76.8 kbps over long daisy-chained cable runs inside commercial HVAC and lighting cabinets. The part's ±60V tolerance protects VAV controllers, thermostats, and AHU nodes from mis-wiring during commissioning. With industrial -40°C to +85°C operation it handles unconditioned mechanical-room environments. Used as the bus transceiver between the VAV controller MCU and the MS-TP trunk, it delivers 1/8 unit loading so a single BACnet segment can support the 128-node maximum specified by ASHRAE 135; unlike discrete RS485 implementations it integrates fault protection, simplifying UL-listed panel designs.
Empfohlen
Motor Drive Feedback Link
The LTC2863IS8-1 fits motor-drive feedback links where encoder or resolver data is transmitted between the drive and controller over an RS485 differential link running near high-voltage switching nodes. Its ±60V fault protection and ±25kV HBM ESD provide immunity to the fast transients produced by IGBT/MOSFET switching that couple through parasitic capacitance into the bus cable. The full-duplex topology supports simultaneous position-command and telemetry data flow. Deployed as the UART-to-RS485 bridge inside the drive enclosure, the LTC2863 allows encoder data rates up to 20 Mbps; unlike an optocoupler-isolated RS485 it integrates fault protection, reducing component count on the isolated secondary side.
Empfohlen
Smart-Grid Energy Metering
The LTC2863IS8-1 suits smart-grid metering DLMS/COSEM or IEC 62056-21 optical/RS485 ports because its ±60V bus tolerance survives the bus voltage transients seen when multiple meters share a long cable run and adjacent AC circuits induce common-mode stress. The 3.3V-5.5V supply matches the meter MCU's native logic level, eliminating level shifters and reducing standby current. With 1/8 unit load it allows many meters on a single bus segment for AMI concentrator networks. Mounted between the metering SoC UART and the meter's optical/RS485 port, the LTC2863 delivers reliable long-cable communication; unlike a generic transceiver it does not need separate surge protection components.
Empfohlen
Access Control and Security Panel Networks
The LTC2863IS8-1 fits access-control panel networks where RS485 links connect door controllers, card readers, and sub-panels over long building cable runs. Its ±60V fault window tolerates field wiring errors during installation, and the industrial temperature range handles unconditioned equipment closets. Full-duplex operation supports OSDP (Open Supervised Device Protocol) secure channel communication between panels and readers. Used between the panel MCU and the RS485 trunk, the LTC2863 provides a robust, encrypted-ready physical layer; unlike a discrete RS485 design it integrates fault clamping, reducing the panel's UL 294 / EN 50131-3 component count.
Empfohlen
Renewable Energy Inverter Communication
The LTC2863IS8-1 suits photovoltaic and wind inverter communication buses where Modbus or SunSpec-compliant RS485 links connect inverters to data loggers and SCADA systems. The ±60V fault protection tolerates the high common-mode voltages that appear on long DC-coupled cable runs near solar arrays, while ±25kV HBM ESD protects against installer handling transients. The 3.3V-5.5V supply allows direct interface to the inverter's DSP or MCU logic without level translation. Deployed as the bus transceiver inside the inverter's communication board, the LTC2863 supports the standard Modbus RTU 19.2 kbps to 115.2 kbps rates used by most PV monitoring systems; unlike a basic RS485 chip it integrates fault protection that survives DC bus transients.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für LTC2863IS8-1 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | LT1785IS8 | SN65HVD75DR | MAX3485ESA |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Texas Instruments | Analog Devices (Maxim) |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Bus Fault Protection | ±60 V | ±25 V (-58%) | ±18 V (-70%) | ±14 V (-77%) |
| Bus Pin ESD (HBM) | ±25 kV | ±15 kV (-40%) | ±16 kV (-36%) | ±15 kV (-40%) |
| Supply Voltage | 3.0 V to 5.5 V | 4.75 V to 5.25 V (5 V only) | 3.0 V to 3.6 V (3.3 V only) | 3.0 V to 3.6 V (3.3 V only) |
| Unit Load | 1/8 (256 nodes) | 1/4 (128 nodes) | 1/8 (256 nodes) | 1 unit load (32 nodes) |
| Data Rate (max) | 20 Mbps | 0.25 Mbps (-98%) | 20 Mbps | 10 Mbps (-50%) |
| Topology | Full-Duplex (1/1) | Half-Duplex | Half-Duplex | Half-Duplex |
Wichtigste Unterscheidungsmerkmale
- ±60V bus fault tolerance vs ±14V on legacy parts (vs. MAX3485ESA)
- 1/8 unit load supporting 256 nodes vs 32 nodes (vs. MAX3485ESA)
- Wide 3V-5.5V supply vs 5V-only legacy transceivers (vs. LT1785IS8)
- Pin-compatible ruggedization upgrade path (vs. LT1785IS8)
Designhinweise
Place a 100nF ceramic decoupling capacitor as close as possible to the VCC pin (pin 8) of the LTC2863IS8-1, with a 10µF bulk capacitor on the same supply rail within 25mm. Keep the bus traces (Y, Z on driver; A, B on receiver) routed as a matched differential pair with 100Ω differential impedance, and place the 120Ω termination resistor only at the two end nodes of the bus, never in the middle. A continuous ground plane beneath the bus traces is mandatory for the ±60V fault clamp to redirect surge energy; a split ground under the bus traces can defeat the internal TVS protection and cause failure during a fault event.
Do not assume the -1 and -2 pinout variants of the LTC2863 family are interchangeable: the LTC2863IS8-1 is full-duplex with separate Y/Z driver outputs and A/B receiver inputs, while the LTC2862IS8-2 (or -2 suffix parts) is half-duplex with shared A/B pins routed through DE/RE control. Substituting a -2 part on a -1 board will short the driver outputs to the receiver inputs and likely destroy the IC at first transmission. Always cross-check the suffix against the LTC2862/LTC2863 family selection table before PCB assembly.
Maintain at least 3mm creepage distance between the bus pins (Y, Z, A, B) and any low-voltage logic traces or MCU pins to preserve the ±60V isolation rating. If the design routes the bus cable near the board edge, add a guard ring tied to chassis ground around the bus connector footprint to absorb ESD before it reaches the IC. The RE# and DE pins should be tied through a 10kΩ resistor (not directly to VCC or GND) so that during power-up the driver and receiver are disabled until the MCU initializes its GPIO, preventing transient bus contention.
Estimated: at 3.3V supply, 20 Mbps, and 100% driver duty cycle into a 60Ω differential load, the LTC2863IS8-1 dissipates approximately 200mW. With the 8-SOIC package's typical theta_JA of 110°C/W on a 1oz 2-layer board, the junction temperature rise is approximately 22°C above ambient. No heatsink is required for normal operation, but for designs that place the part inside a sealed enclosure above 60°C ambient, upgrade to the MP-grade variant (-55°C to 125°C) of the LTC2863 family and verify with a thermal probe in worst-case conditions.
Compliance-Informationen
RoHS and REACH compliant per the #PBF lead-free finish suffix and Analog Devices product page. Not AEC-Q100 qualified; for automotive RS485 transceivers consider the MAX22530 (Analog Devices) or TCAN334 (TI). ECCN EAR99 per GlobalSpec listing - no export license required for commercial shipments.
