SN75ALS194D Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN75ALS194D is a quad differential line transmitter compliant with EIA/TIA-422-B, ITU V.11, and RS-422 standards, operating from a 5 V supply and providing 4 independent balanced output channels. It drives differential signals up to ±2 V across a 100 Ω load, supporting data rates appropriate for long-distance industrial communication links. Housed in a 16-pin SOIC package, it suits industrial automation, process control, and data communication equipment requiring reliable RS-422 transmission.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN75ALS194D Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.2330(MOQ 10)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Quad 4-channel differential RS-422/EIA-422-B/ITU V.11 line transmitter
- 5 V single-supply operation with differential output swing up to ±2 V
- Supports long-distance data transmission over 100 Ω balanced twisted-pair lines
- High-impedance inputs with 50 µA maximum input current for easy logic interfacing
- 16-pin SOIC (R-PDSO-G16) package for standard SMT assembly
- RoHS-compliant construction per JESD-609 e4
- Compatible with V.11 and EIA-422-B industrial communication standards
Applications
The SN75ALS194D is used in industrial automation and process control systems where RS-422 differential signaling is required to transmit data reliably over cables up to 1200 m at lower data rates, or at higher speeds over shorter distances. It also serves as the transmit side of serial communication interfaces in PLCs, CNC controllers, and motion control systems, and is deployed in test and measurement equipment, SCADA systems, and multipoint data acquisition networks that demand the noise immunity and common-mode rejection of balanced differential transmission.
Specifications
| YTEOL | 0 |
| Differential Output | YES |
| Driver Number of Bits | 4 |
| High Level Input Current-Max | 0.00005A |
| Input Characteristics | STANDARD |
| Interface IC Type | LINE DRIVER |
| Interface Standard | V.11; EIA-422-B |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Number of Functions | 2 |
| Out Swing-Min | 2V |
| Output Characteristics | 3-STATE |
| Output Low Current-Max | 0.048A |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 45mA |
| 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 | COMMERCIAL |
| 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) | NOT SPECIFIED |
| Transmit Delay-Max | 14ns |
| ## SN75ALS194D Alternates Showing results | Image |
| 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 |
| Country of Origin | Mexico |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN75ALS194D:
Frequently Asked Questions
How many differential output channels does SN75ALS194D provide, and which communication standards does it comply with?
The SN75ALS194D provides 4 independent differential output channels and complies with EIA/TIA-422-B, ITU-T V.11, and RS-422 standards. Each channel drives a balanced differential signal with a swing of at least ±2 V into a 100 Ω termination resistor, enabling noise-immune data transmission over long cables in industrial environments without signal degradation.
Over what cable length can SN75ALS194D transmit RS-422 data reliably, and how does that compare to RS-232?
RS-422 differential signaling used by the SN75ALS194D supports cable lengths up to approximately 1200 m at low data rates (below 100 kbps), far exceeding the 15 m limit of RS-232. At higher data rates—for example 10 Mbps—the practical cable length is shorter, around 12 m, but still sufficient for many industrial machine-to-machine links where RS-232 would be completely impractical.
What supply voltage does SN75ALS194D require, and can it interface directly with 5 V TTL logic outputs?
The SN75ALS194D operates from a single 5 V supply. Its inputs are compatible with standard TTL and 5 V CMOS logic levels, accepting high-level input current of at most 50 µA and standard switching thresholds. This allows direct connection from 5 V microcontroller UART TX pins or FPGA outputs without voltage level translation, simplifying the interface design.
For a PLC installation requiring 4 independent RS-422 transmit channels, how does SN75ALS194D compare to using 4 discrete single-channel drivers?
Integrating 4 RS-422 transmitters into the SN75ALS194D's 16-pin SOIC package reduces board area to roughly one-quarter compared to four individual 8-pin single-channel driver ICs. It also reduces the total component count, simplifies power supply decoupling, and lowers BOM cost—important in high-volume PLC backplane modules where per-channel cost and board density both matter.
Is SN75ALS194D suitable for multipoint RS-422 bus configurations, or is it limited to point-to-point links?
The SN75ALS194D is a unidirectional transmitter, making it ideal for point-to-multipoint RS-422 bus configurations where one master transmitter drives up to 10 receiver loads simultaneously. For multidrop bidirectional RS-485 buses, a transceiver with receiver capability would be needed instead. However, in broadcast or one-way telemetry systems transmitting from a single controller to multiple remote nodes over a 4-wire differential bus, SN75ALS194D is a direct fit.
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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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 10+ | $1.5350 | $15.35 |
| 40+ | $1.3413 | $53.65 |
| 120+ | $1.2330 | $147.96 |
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