SN75C185NE4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
SN75C185NE4 is a Low-Power RS-232 Multiple Driver and Receiver IC in 20-pin DIP package. Compliant with EIA-232-F and TIA-232-F standards, it features Schmitt trigger inputs and 3-driver 5-receiver configuration. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN75C185NE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN75C185NE4?
- EIA-232-F / TIA-232-F compliant RS-232 line transceiver with Schmitt trigger inputs for noise-immune serial data reception
- 3 driver and 5 receiver channel configuration supporting multi-port serial communication in a single 20-pin DIP device
- Low-power design with 1 µA maximum high-level input current, minimizing standby power consumption in battery-backed serial interfaces
What is SN75C185NE4 used for?
SN75C185NE4 is used in legacy industrial equipment, embedded systems, and test instruments requiring RS-232 serial communication with multiple independent driver and receiver channels. The Schmitt trigger inputs provide noise immunity for long cable runs where signal edges are degraded, making it suitable for factory floor automation and PLC serial ports. Operating from ±12 V dual supply rails, it is compatible with existing RS-232 infrastructure requiring full EIA-232-F swing of ±5 V to ±15 V.
What are the specifications of SN75C185NE4?
| YTEOL | 0 |
| Additional Feature | ALSO REQUIRES -12V SUPPLY |
| Differential Output | NO |
| Driver Number of Bits | 3 |
| High Level Input Current-Max | 0.000001A |
| Input Characteristics | SCHMITT TRIGGER |
| Interface IC Type | LINE TRANSCEIVER |
| Interface Standard | EIA-232-F; TIA-232-F; V.28 |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e4 |
| Number of Functions | 3 |
| Out Swing-Min | 8V |
| Output Characteristics | TOTEM-POLE |
| Output Low Current-Max | 0.0032A |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Receive Delay-Max | 4000ns |
| Receiver Number of Bits | 5 |
| Supply Current-Max | 0.75mA |
| Supply Voltage-Max | 6V |
| Supply Voltage-Min | 4.5V |
| Supply Voltage-Nom | 5V |
| Supply Voltage1-Max | 13.2V |
| Supply Voltage1-Min | 4.5V |
| Supply Voltage1-Nom | 12V |
| Surface Mount | NO |
| Technology | BICMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Transmit Delay-Max | 3500ns |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Where can I find the SN75C185NE4 datasheet?
SN75C185NE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN75C185NE4?
Compatible alternatives and drop-in replacements for SN75C185NE4:
Frequently Asked Questions
How many RS-232 drivers and receivers does SN75C185NE4 provide in a single package?
SN75C185NE4 integrates 3 independent RS-232 drivers and 5 independent receivers in a single 20-pin DIP package. This combination allows implementing multi-channel serial interfaces such as RS-232 modems or multi-port industrial controllers without multiple discrete line driver ICs.
What supply voltages does SN75C185NE4 require for proper RS-232 operation?
SN75C185NE4 requires both a +5 V logic supply and a -12 V negative supply to generate RS-232-compliant output voltage swings of ±5 V to ±15 V. The dual supply requirement is typical for legacy RS-232 transceivers and must be considered during board power architecture planning.
How does the Schmitt trigger input improve SN75C185NE4 receiver performance on noisy serial lines?
The Schmitt trigger inputs of SN75C185NE4 provide hysteresis of approximately 0.5 V, preventing multiple false transitions on slow or noisy RS-232 receive signals. This is valuable for industrial RS-232 links exceeding 10 m cable length where capacitive loading reduces signal slew rate.
In which applications is SN75C185NE4 preferred over modern RS-232 transceivers with charge pumps?
SN75C185NE4 is preferred in systems that already have ±12 V dual supply rails, such as legacy industrial PLC backplanes and laboratory instruments, where eliminating the charge pump reduces EMI from switching noise. Its 20-pin DIP package also supports through-hole assembly for rugged PCBs that cannot use surface-mount components.
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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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