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
- Price
- From $6.7133(MOQ 28)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LT1785IS8#PBF?
- 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
What is LT1785IS8#PBF used for?
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.
What are the specifications of LT1785IS8#PBF?
| 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 |
Where can I find the LT1785IS8#PBF datasheet?
LT1785IS8#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LT1785IS8#PBF?
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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About Analog Devices
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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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 28+ | $7.2728 | $203.64 |
| 36+ | $6.9930 | $251.75 |
| 45+ | $6.7133 | $302.10 |
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