SN65LBC174DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN65LBC174DWG4 is a quad EIA-485 / RS-485 differential line driver from Texas Instruments, supporting data rates up to 10 Mbps on a 5 V supply. It provides four independent half-duplex driver channels with tri-state outputs, ±60 mA output drive current, and high ESD tolerance, packaged in a 20-pin SOIC. Suited for industrial multi-point data communication networks, PLCs, and motor drive systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN65LBC174DWG4 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
- Quad EIA-485/RS-422 differential line driver with 4 independent channels
- Data rate up to 10 Mbps over twisted-pair cables
- ±60 mA output drive current for robust long-distance transmission
- Tri-state outputs enable bus sharing among multiple drivers
- 5 V single-supply operation with CMOS/TTL compatible inputs
- 20-pin SOIC package for easy PCB integration
Applications
The SN65LBC174DWG4 is commonly used in industrial automation networks, where multiple nodes communicate over RS-485 multi-drop buses at distances up to 1200 m. It is also well suited for programmable logic controllers (PLCs), motor drives, and building automation systems that demand reliable differential signaling in electrically noisy environments. The device is further applied in half-duplex serial communication links for process instrumentation and HVAC control panels.
Specifications
| YTEOL | 0 |
| Differential Output | YES |
| Driver Number of Bits | 4 |
| High Level Input Current-Max | 0.0001A |
| Input Characteristics | STANDARD |
| Interface IC Type | LINE DRIVER |
| Interface Standard | EIA-485 |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Number of Functions | 4 |
| Out Swing-Min | 1.1V |
| Output Characteristics | 3-STATE |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 7mA |
| 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 | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Transmit Delay-Max | 20ns |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN65LBC174DWG4:
Frequently Asked Questions
How many differential driver channels does SN65LBC174DWG4 integrate on a single chip?
SN65LBC174DWG4 integrates 4 independent EIA-485 differential driver channels in a single 20-pin SOIC package. Each channel has its own enable pin for tri-state control, allowing multiple devices to share a common RS-485 bus without signal contention. The quad integration reduces board area and component count compared to using four single-channel RS-485 drivers.
Up to what data rate can SN65LBC174DWG4 transmit over an RS-485 twisted-pair cable?
SN65LBC174DWG4 supports data rates up to 10 Mbps over standard RS-485 twisted-pair cabling. At this rate, the device delivers differential output voltage levels that exceed the 1.5 V minimum required by the EIA-485 standard, ensuring reliable data reception at the far end of the bus even with the ±60 mA drive current loaded by typical 120-ohm termination resistors.
In a PLC network with 32 nodes on one bus segment, how does SN65LBC174DWG4 handle bus loading?
SN65LBC174DWG4's ±60 mA output drive capability and its compliance with the EIA-485 unit load specification allow it to drive up to 32 unit loads on a single bus segment. Each driver channel maintains the minimum ±1.5 V differential output voltage across the full 120-ohm termination load, and the tri-state outputs ensure that idle drivers present a high-impedance state to avoid bus contention in a 32-node multi-drop network.
For a 5 V industrial control system, is SN65LBC174DWG4 directly compatible with 3.3 V microcontroller logic outputs?
SN65LBC174DWG4 operates on a 5 V supply and has CMOS/TTL compatible input thresholds, meaning it recognizes a logic high from approximately 2 V upward. While its inputs are not directly rated for 3.3 V LVTTL in all conditions, a 3.3 V logic high typically exceeds the 2 V input threshold, so direct connection is feasible in most designs. Designers should verify input current and threshold margins against the MCU's output drive specs at the target operating temperature of -40°C to 85°C.
How does the 20-pin SOIC package of SN65LBC174DWG4 compare to a 20-pin SSOP in PCB footprint?
The 20-pin SOIC package has a body width of 7.5 mm and a lead pitch of 1.27 mm, resulting in a total PCB footprint of approximately 12.8 mm × 10.3 mm. The 20-pin SSOP, by contrast, has a 5.3 mm body width and a 0.65 mm pitch, occupying roughly 8.7 mm × 6.2 mm. The SOIC is approximately 2× larger in area but offers wider pad spacing, which simplifies hand soldering and rework in prototyping and low-volume production.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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