SN75LBC174DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN75LBC174DWG4 is a quad EIA-485/RS-485 differential line transmitter operating from a 5 V supply in a 20-pin SOIC package. It drives 4 independent differential output pairs with 100 µA maximum input current, suited for multi-drop industrial networks transmitting data over long cable runs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN75LBC174DWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Quad RS-485 differential driver integrates 4 transmitter channels in a single 20-pin SOIC for high-channel-density industrial networks
- EIA-485 compliant differential outputs provide robust common-mode noise immunity for reliable communication over 1200 m cable lengths
- 5 V single-supply operation with 100 µA maximum input current simplifies interface to 5 V TTL/CMOS control logic without level translation
Applications
The SN75LBC174DWG4 is designed for industrial automation networks requiring multiple RS-485 differential transmitter channels in a compact package. Its quad driver architecture suits multi-axis motion controllers, programmable logic controllers, and building automation systems that need 4 independent RS-485 bus outputs from a single IC. The 20-pin SOIC format enables high-density network interface card designs handling multiple independent communication ports on a single PCB.
Specifications
| Pbfree Code | Yes |
| 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 | 1.5V |
| Output Characteristics | 3-STATE |
| 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 Voltage-Max | 5.25V |
| Supply Voltage-Min | 4.75V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| 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 SN75LBC174DWG4:
Frequently Asked Questions
How many independent RS-485 channels does SN75LBC174DWG4 provide and how does this reduce component count on an industrial controller PCB?
SN75LBC174DWG4 integrates 4 independent RS-485 differential transmitter channels in a 20-pin SOIC, replacing 4 separate single-channel driver ICs. This consolidation reduces PCB footprint by approximately 60%, cuts BOM from 4 parts to 1, and simplifies routing by co-locating 4 differential pairs near the connector block in factory automation and SCADA communication designs.
What cable lengths can SN75LBC174DWG4 drive at standard RS-485 data rates for industrial field-bus applications?
EIA-485 compliant drivers like SN75LBC174DWG4 support cable runs up to 1200 m at 100 kbps data rates. At higher rates such as 1 Mbps, the maximum cable length decreases to approximately 100 m due to cable capacitance and propagation delay. The differential output architecture maintains signal integrity across these distances despite common-mode noise levels up to 7 V on industrial floors.
How does SN75LBC174DWG4 interface with a 5 V TTL microcontroller output for RS-485 transmission?
SN75LBC174DWG4 operates from a 5 V supply and accepts TTL-compatible input logic levels with VIH minimum 2.0 V and VIL maximum 0.8 V, drawing only 100 µA maximum input current. This allows direct connection to 5 V GPIO pins of microcontrollers and FPGA I/O banks without current-limiting resistors or level converters, simplifying PCB design for RS-485 multipoint communication.
For a building automation controller with 4 independent RS-485 sensor buses, what are the advantages of SN75LBC174DWG4 over 4 discrete SN75176 devices?
SN75LBC174DWG4 integrates all 4 RS-485 driver channels in a 20-pin SOIC versus 4 separate 8-pin DIP or SOIC packages for SN75176. This reduces total IC footprint from approximately 320 mm² to 80 mm², eliminates 3 extra decoupling capacitors, and improves channel-to-channel timing skew matching since all 4 drivers share the same silicon die and operating conditions.
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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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