LTC2862AIS8-2 - ±60V RS485/RS422 Transceiver | Analog Devices
Référence : LTC2862AIS8-2 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.26 | $6,26 |
| 10 | $5.63 | $56,30 |
| 100 | $5.01 | $501,00 |
| 500 | $4.5 | $2 250,00 |
| 1 000 | $4 | $4 000,00 |
LTC2862AIS8-2 Présentation
An RS485/RS422 transceiver is a physical-layer device that converts between a single-ended UART/CMOS logic signal on the microcontroller side and a robust differential signal on the bus side, enabling reliable serial communication over twisted-pair cables at distances up to 1200 meters. RS485 is the de-facto standard for industrial multipoint buses (Modbus RTU, Profibus, DMX512) while RS422 is used for point-to-point high-speed links; the LTC2862 family supports both. Half-duplex means one differential pair is shared between transmit and receive, with direction controlled by a logic pin.
Key features include ±60V fault tolerance on the bus pins, IEC 61000-4-2 Level 4 ESD protection (typically 8 kV contact, 15 kV air per the manufacturer's IEC ESD rating), current-limited drivers, thermal shutdown, and a fully balanced differential receiver threshold for low duty-cycle distortion. The 8-pin SOIC package is pin-compatible with legacy LT1785/LT1791 footprints and the original LTC2862 family, enabling direct board replacement.
The LTC2862A uses a CMOS process with switched-capacitor charge pump to generate the ±60V fault-tolerant driver supply. The architecture delivers low quiescent current during idle while still maintaining high drive strength during bus arbitration, and the receiver exhibits 250 mV typical hysteresis with a 50 mV worst-case offset to meet TIA/EIA-485-A.
Typical applications include industrial fieldbus networks (Modbus, Profibus), solar inverter monitoring, building automation (BACnet), motor control encoder links, and any 3V-5V MCU interface that must survive miswiring, ESD strikes, or transient overvoltage events on long cable runs. The wide 3V-5.5V supply range also supports battery-powered remote sensor nodes.
When designing with this device, place 100 nF decoupling close to VCC and use twisted-pair cable with proper termination (120 Ω) at the bus ends. The -2 suffix denotes 20 Mbps high-speed grade; the -1 variant is 250 kbps low-EMI grade - select based on your data rate and EMI budget.
Alternatives de remplacement direct pour LTC2862AIS8-2 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC2862AIS8-2#WPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2862IS8-2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2862AIS8-1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2862AIS8-2 Spécifications
| Fonction | RS485/RS422 Transceiver (Half-Duplex) |
| Débit de données | 20 Mbps (high-speed grade, -2 suffix) |
| Number of Drivers/Receivers | 1/1 |
| Protocol | RS422, RS485 |
| Tension d'alimentation | 3 V to 5.5 V |
| Fault Protection (Bus Pins) | ±60 V overvoltage |
| ESD Protection | IEC 61000-4-2 Level 4 |
| Receiver Hysteresis | 250 mV typical |
| Température de fonctionnement | -40 °C to +85 °C (industrial, A suffix) |
| Boîtier | 8-SOIC (S8) |
| Type de montage | Surface Mount |
| Duplex | Half |
| Nombre de broches | 8 |
| Statut RoHS | Compliant (PBF suffix) |
| Compliance | TIA/EIA-485-A |
Configuration des broches de LTC2862AIS8-2
| Broche 1 | RO — Receiver Output (logic-level signal to MCU UART RX) |
| Broche 2 | RE — Receiver Enable (active-low, tie to GND to enable receiver) |
| Broche 3 | DE — Driver Enable (logic high enables driver for transmit) |
| Broche 4 | DI — Driver Input (logic-level signal from MCU UART TX) |
| Broche 5 | GND — Ground |
| Broche 6 | A — Non-inverting differential bus line |
| Broche 7 | B — Inverting differential bus line |
| Broche 8 | VCC — Supply Voltage (3 V to 5.5 V) |
Applications typiques
LTC2862AIS8-2 convient pour 6 applications: Industrial Modbus RTU Fieldbus, Solar Inverter Monitoring (RS485), Building Automation (BACnet MS-TP), Motor Encoder / Servo Drive Link, DMX512 Stage Lighting Control, Battery-Powered Remote Sensor Node.
Industrial Modbus RTU Fieldbus
The LTC2862AIS8-2 is ideal for Modbus RTU networks operating on 3.3V or 5V MCUs in factory automation. Its ±60V fault tolerance survives accidental contact with 24V control wiring on the shop floor, while the 20 Mbps data rate handles 115.2 kbaud Modbus and higher-speed proprietary protocols. Place the part between the MCU UART and the isolated bus-side transceiver, with 120Ω termination at cable ends. The IEC Level 4 ESD rating eliminates external TVS diodes and reduces BOM cost. Differential signaling over twisted pair rejects common-mode noise from VFD drives and motor starters that share the same cable tray.
Recommandé
Solar Inverter Monitoring (RS485)
In solar inverter monitoring systems, the LTC2862AIS8-2 connects the inverter's MPPT controller to a string-monitoring data logger over RS485. The 3V-5.5V supply range supports direct connection to 3.3V DSP/MCU without level shifters. ±60V fault protection is critical because DC bus voltages up to 1500V can induce destructive transients on long PV cable runs during grid disturbances. The 20 Mbps speed supports inverter-to-inverter daisy-chained communications, while IEC Level 4 ESD survives installer handling and lightning-induced coupling. The 8-SOIC package fits compact inverter power modules with thermal headroom up to 85°C.
Recommandé
Building Automation (BACnet MS-TP)
The LTC2862AIS8-2 supports BACnet MS-TP (Master-Slave Token Passing) networks used in HVAC controllers, VAV boxes, and lighting control panels. Operating from a single 3.3V or 5V rail simplifies power design in space-constrained building automation enclosures. The ±60V bus tolerance handles miswiring during installation where electricians may accidentally connect the MS-TP pair to a 24V thermostat circuit. The 20 Mbps capability exceeds the 76.8 kbps BACnet requirement, leaving bandwidth headroom for diagnostics. Wide industrial temperature range (-40°C to +85°C) supports unheated rooftop equipment rooms.
Recommandé
Motor Encoder / Servo Drive Link
The LTC2862AIS8-2 provides robust serial communication between servo drives and central motion controllers over RS485. Differential signaling rejects EMI from PWM-driven motor phases and switching power supplies in the drive cabinet. The 20 Mbps rate supports high-speed encoder feedback and drive parameter updates from the controller to multiple drives on a shared bus. ±60V fault tolerance protects against DC bus transients and motor regen events. Half-duplex operation matches the typical drive-to-controller topology where one pair carries both command and telemetry.
Recommandé
DMX512 Stage Lighting Control
The LTC2862AIS8-2 is well-suited for DMX512 lighting consoles and dimmer racks, where RS485 differential signaling on XLR-3 cables connects fixtures up to 300 meters from the controller. The 20 Mbps capability exceeds the 250 kbps DMX512 standard, providing ample margin for derivative protocols and future bandwidth needs. ±60V fault protection prevents damage when stage power cables accidentally short to DMX lines during setup. IEC Level 4 ESD survives the frequent connector mating/unmating in touring environments. The 8-SOIC package fits into the compact fixture and dimmer-pack form factors.
Recommandé
Battery-Powered Remote Sensor Node
The LTC2862AIS8-2 enables low-power RS485 communication in battery-powered remote sensor nodes for environmental monitoring, agriculture, or pipeline telemetry. The 3V-5.5V supply supports direct connection to a 3.6V LiSOCl2 or 3.7V Li-ion cell without boost converters. Low quiescent current during idle preserves battery life; the device only draws significant current when actively transmitting sensor data. ±60V fault protection is essential because remote nodes are often installed near power lines or motor control cabinets where ground faults can induce high common-mode voltages on the bus. The wide temperature range supports outdoor deployment.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC2862AIS8-2 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC2862AIS8-2#WPBF | LTC2862IS8-2 | LTC2862AIS8-1 | LTC2862AIDD-2 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC (S8) | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-DFN (different footprint) |
| Data Rate | 20 Mbps | 20 Mbps | 20 Mbps | 250 kbps | 20 Mbps |
| Supply Voltage | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V |
| Bus Fault Protection | ±60 V | ±60 V | ±60 V | ±60 V | ±60 V |
| Automotive Grade (AEC-Q100) | No | Yes (AEC-Q100 qualified) | No | No | No |
| Duplex | Half | Half | Half | Half | Half |
| Drivers/Receivers | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 |
Principaux différenciateurs
- ±60 V bus fault tolerance across all operating modes including power-down (vs LTC2862IS8-2 (first generation))
- AEC-Q100 automotive qualified variant available in same footprint (vs LTC2862AIS8-2#WPBF)
- 20 Mbps data rate for high-speed fieldbus applications (vs LTC2862AIS8-1 (250 kbps))
Notes de conception
Place a 100 nF decoupling capacitor as close as possible to the VCC pin (pin 8) of the LTC2862AIS8-2 to suppress supply transients during bus driver switching. Add a 10 µF bulk capacitor if the VCC trace is longer than 25 mm or shares inductance with high-current digital logic. Keep the bus traces (A, B) matched in length and routed as a differential pair with 100 Ω characteristic impedance on twisted-pair cable. Place the 120 Ω termination resistor at the physical ends of the bus only, never at stub nodes, to prevent reflection artifacts.
Do not connect the LTC2862AIS8-2 A and B pins directly to external TVS diodes in parallel - the part's internal ±60 V fault protection already handles transient suppression, and external TVS capacitance can degrade the 20 Mbps signal integrity. Do not leave the DE (driver enable) pin floating; tie DE low for receive-only mode or high for transmit. Do not operate with VCC below 3 V or above 5.5 V; the bus fault protection is independent of VCC state but the logic interface requires a valid supply. Always use twisted-pair cable (not parallel wires) to meet the EIA-485 common-mode rejection spec.
Separate the bus-side differential traces (A, B) from the logic-side CMOS traces (DI, DE, RE, RO) on the PCB to prevent noise coupling from the bus into the MCU UART. Use a ground guard trace or copper pour between the two regions for additional isolation. The exposed pad (if using the DFN variant) must be soldered to a continuous ground plane for thermal dissipation - in 8-SOIC variants, the GND pin handles the return path. Avoid routing the bus traces near switching power supply inductors or motor phase traces, which inject common-mode noise that can exceed the receiver's common-mode range (-25 V to +25 V).
Informations de conformité
RoHS compliant per #PBF suffix. AEC-Q100 qualified only on the #WPBF automotive suffix variant; standard LTC2862AIS8-2 is industrial grade. Halogen-free status not explicitly stated in available data - marked unknown per data authenticity rules.
