LT1785IS8#PBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
Analog Devices LT1785IS8#PBF is a 60 V fault-protected RS-485 and RS-422 line transceiver in an SOIC-8 package featuring differential Schmitt trigger inputs and 5 µA maximum high-level input current for robust industrial communication. It protects against cable fault voltages up to ±60 V for safe long-line operation. Available worldwide with global distribution.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LT1785IS8#PBF Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 60 V fault protection on RS-485/RS-422 bus lines safeguarding against cable faults and high-voltage transients in industrial environments
- Differential Schmitt trigger receiver inputs providing superior noise immunity on long cable runs with common-mode noise up to several volts
- Ultra-low 5 µA maximum input current enabling high bus loading capacity with up to 256 unit loads on a single RS-485 network
Applications
The LT1785IS8#PBF is designed for industrial RS-485 and RS-422 communication networks where cable fault protection and noise immunity are critical, such as factory automation fieldbus systems, building automation controllers, and SCADA remote terminal units. Its ±60 V fault-protected inputs prevent device damage when energized cables are accidentally cross-connected or subjected to high-voltage surges on long cable runs. The differential Schmitt trigger receiver ensures reliable data recovery in electrically noisy environments with ground potential differences between nodes.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1610 (S8) |
| YTEOL | 10 |
| Differential Output | YES |
| Driver Number of Bits | 1 |
| High Level Input Current-Max | 0.000005A |
| Input Characteristics | DIFFERENTIAL SCHMITT TRIGGER |
| Interface IC Type | LINE TRANSCEIVER |
| Interface Standard | EIA-422; EIA-485 |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Out Swing-Min | 1.2V |
| Output Characteristics | DIFFERENTIAL |
| Output Low Current-Max | 0.0016A |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Receive Delay-Max | 900ns |
| Receiver Number of Bits | 1 |
| Supply Current-Max | 9mA |
| Supply Voltage-Max | 5.25V |
| Supply Voltage-Min | 4.75V |
| Supply Voltage-Nom | 5V |
| Supply Voltage1-Max | 5.25V |
| Supply Voltage1-Min | 4.75V |
| Supply Voltage1-Nom | 5V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Transmit Delay-Max | 2000ns |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the 60 V fault protection on the LT1785IS8#PBF prevent device damage in industrial RS-485 cable installations?
The LT1785IS8#PBF tolerates bus voltages up to ±60 V on its RS-485 differential pins without damage, protecting against common industrial fault conditions such as accidental connection to 48 V power lines, cable cross-wiring, or high-energy transients from inductive equipment. Standard RS-485 transceivers rated at only ±15 V would be destroyed in these conditions, requiring costly board replacement and system downtime.
What receiver input characteristics of the LT1785IS8#PBF improve signal integrity on long industrial cable runs?
The LT1785IS8#PBF uses a differential Schmitt trigger receiver with hysteresis on its input thresholds, which prevents chatter and false transitions when the received RS-485 signal contains slow edges or noise from electromagnetic interference on cables exceeding 100 meters. The 5 µA maximum high-level input current also means up to 256 unit loads can share a single RS-485 bus segment without exceeding the standard bus loading limit.
For a SCADA system using RS-422 point-to-point links, why would the LT1785IS8#PBF be selected over a standard non-protected RS-485 transceiver?
In SCADA applications with remote terminal units connected by long RS-422 cables across different ground potentials, the LT1785IS8#PBF provides ±60 V fault protection that absorbs ground potential differences up to 60 V between nodes without damaging the transceiver IC. A standard RS-485 part rated to only ±12 V to ±15 V would be destroyed by 50 V ground differentials common in outdoor substation environments, whereas the LT1785IS8#PBF continues operating reliably in the SOIC-8 package within typical industrial temperature ranges.
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Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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