ST75185CTR - 3.3V/5V RS-232 Transceiver | STMicroelectronics
Teilenummer: ST75185CTR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $0.5929 | $0,59 |
ST75185CTR Übersicht
RS-232 transceivers are a type of serial communication interface IC that converts logic-level signals (typically 3.3V or 5V) to RS-232 voltage levels (±5V to ±15V) and vice versa. They are part of the broader interface IC category, which also includes UARTs, USB transceivers, and CAN transceivers. RS-232 transceivers are essential for legacy serial communication with PCs, industrial equipment, and test instruments, where the RS-232 standard (EIA-232) is still widely used.
Key features of the ST75185CTR include a data rate of up to 120 kbps, which is sufficient for most RS-232 applications, and an ESD protection of ±2 kV (HBM) on the RS-232 pins, ensuring robustness in harsh environments. The device also features a low-power shutdown mode that reduces quiescent current to 1 µA, making it suitable for battery-powered or power-sensitive applications. The charge pump requires only four external 0.1 µF capacitors, simplifying the PCB layout.
The ST75185CTR uses a dual charge pump architecture to generate the positive and negative supply rails from a single 3.3V or 5V input. This eliminates the need for a separate negative supply, reducing system cost and board space. The device is designed to meet the EIA-232 and ITU-T V.28 standards, ensuring interoperability with standard RS-232 devices.
Typical applications include industrial automation, point-of-sale (POS) terminals, data acquisition systems, and embedded systems requiring serial communication. The wide operating temperature range of -40°C to +85°C makes it suitable for industrial environments. The device is also used in networking equipment, such as routers and switches, for console management ports.
When designing with the ST75185CTR, ensure that the charge pump capacitors are placed close to the device pins to minimize noise and ripple. The shutdown pin can be used to reduce power consumption when the transceiver is idle. For ESD protection, the device provides ±2 kV HBM on the RS-232 pins, but additional external protection may be required for applications with higher ESD exposure.
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ST75185CTR
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ST75185CTR Technische Daten
| Number of Drivers | 3 |
| Number of Receivers | 5 |
| Versorgungsspannung | 3.3 V to 5 V |
| Datenrate | 120 kbps |
| ESD Protection | ±2 kV (HBM) |
| Abschaltstrom | 1 µA |
| Betriebstemperatur | -40°C to +85°C |
| Gehäuse | SOIC-20 |
| Montageart | Surface Mount |
| Charge Pump Capacitors | 4 x 0.1 µF |
| RS-232 Output Voltage | ±10 V (typical) |
| Receiver Input Voltage Range | ±30 V |
| RoHS-Status | Compliant |
| MSL-Level | 1 |
| Standards | EIA-232, ITU-T V.28 |
ST75185CTR Pin-Konfiguration
| Pin 1 | C1+ — Charge pump capacitor positive terminal |
| Pin 2 | V+ — Positive charge pump output |
| Pin 3 | C1- — Charge pump capacitor negative terminal |
| Pin 4 | C2+ — Charge pump capacitor positive terminal |
| Pin 5 | C2- — Charge pump capacitor negative terminal |
| Pin 6 | V- — Negative charge pump output |
| Pin 7 | T1OUT — Transmitter 1 output |
| Pin 8 | R1IN — Receiver 1 input |
| Pin 9 | R2IN — Receiver 2 input |
| Pin 10 | R3IN — Receiver 3 input |
| Pin 11 | R4IN — Receiver 4 input |
| Pin 12 | R5IN — Receiver 5 input |
| Pin 13 | T2OUT — Transmitter 2 output |
| Pin 14 | T3OUT — Transmitter 3 output |
| Pin 15 | GND — Ground |
| Pin 16 | T1IN — Transmitter 1 input |
| Pin 17 | T2IN — Transmitter 2 input |
| Pin 18 | T3IN — Transmitter 3 input |
| Pin 19 | R1OUT — Receiver 1 output |
| Pin 20 | VCC — Power supply (3.3V or 5V) |
Typische Anwendungen
ST75185CTR ist geeignet für 6 Anwendungs: Industrial Automation, Point-of-Sale (POS) Terminals, Data Acquisition Systems, Embedded Systems, Networking Equipment, Test and Measurement Instruments.
Industrial Automation
The ST75185CTR is used in industrial automation for serial communication between PLCs, sensors, and controllers. Its 3 drivers and 5 receivers support multiple channels, and the wide operating temperature range (-40°C to +85°C) ensures reliable operation in harsh factory environments. The device operates from a 3.3V or 5V supply, making it compatible with common industrial logic levels. The integrated charge pump eliminates the need for a negative supply, simplifying PCB design. With a data rate of 120 kbps, it can handle typical industrial protocols like Modbus. The ±2 kV ESD protection provides robustness against electrostatic discharge in industrial settings. The low shutdown current of 1 µA helps reduce power consumption in energy-efficient systems.
Empfohlen
Point-of-Sale (POS) Terminals
In POS terminals, the ST75185CTR provides reliable RS-232 communication with peripherals such as barcode scanners, receipt printers, and cash drawers. Its 3 drivers and 5 receivers allow connection of multiple devices. The device operates from a single 3.3V or 5V supply, which is common in POS systems. The integrated charge pump generates the required RS-232 voltage levels without a negative supply, reducing component count. The low shutdown current of 1 µA is beneficial for power-saving modes in battery-backed POS systems. The SOIC-20 package is compact, fitting into space-constrained terminal designs. The wide operating temperature range ensures operation in various retail environments.
Empfohlen
Data Acquisition Systems
The ST75185CTR is used in data acquisition systems to interface with sensors and instruments that communicate via RS-232. Its 3 drivers and 5 receivers enable connection to multiple data sources. The device operates from a 3.3V or 5V supply, compatible with typical data acquisition boards. The integrated charge pump simplifies power supply design. The data rate of 120 kbps is sufficient for most sensor data streams. The ±2 kV ESD protection ensures reliability in field environments. The low shutdown current is useful for portable data loggers. The SOIC-20 package is suitable for PCB integration.
Empfohlen
Embedded Systems
In embedded systems, the ST75185CTR provides a simple interface for serial communication with PCs or other devices. Its 3 drivers and 5 receivers offer flexibility for multiple serial ports. The device operates from a 3.3V or 5V supply, matching common microcontroller logic levels. The integrated charge pump eliminates the need for a negative supply, reducing board space. The low shutdown current of 1 µA is ideal for battery-powered embedded devices. The SOIC-20 package is easy to solder and fits in compact designs. The wide operating temperature range supports various embedded applications.
Empfohlen
Networking Equipment
The ST75185CTR is used in networking equipment such as routers and switches for console management ports. These ports allow administrators to configure devices via a serial connection. The device's 3 drivers and 5 receivers support multiple console connections. It operates from a 3.3V or 5V supply, common in networking hardware. The integrated charge pump simplifies power design. The data rate of 120 kbps is sufficient for console communication. The ±2 kV ESD protection is important for ports that may be exposed to static discharge. The SOIC-20 package is suitable for PCB assembly.
Empfohlen
Test and Measurement Instruments
In test and measurement instruments, the ST75185CTR provides RS-232 communication for remote control and data logging. Its 3 drivers and 5 receivers allow connection to multiple instruments. The device operates from a 3.3V or 5V supply, compatible with instrument power rails. The integrated charge pump eliminates the need for a negative supply. The data rate of 120 kbps is adequate for command and data transfer. The ±2 kV ESD protection ensures reliability in lab environments. The low shutdown current is useful for power-saving modes. The SOIC-20 package is suitable for instrument PCBs.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ST75185CTR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ST75185C | MAX3243ECAI | ADM3202ARUZ |
|---|---|---|---|---|
| Package | SOIC-20 | SOIC-20 | SSOP-28 | TSSOP-16 |
| Brand | STMicroelectronics | STMicroelectronics | Maxim Integrated | Analog Devices |
| Number of Drivers | 3 | 3 | 3 | 2 |
| Number of Receivers | 5 | 5 | 5 | 2 |
| Supply Voltage | 3.3V to 5V | 3.3V to 5V | 3V to 5.5V | 3V to 5.5V |
| Data Rate | 120 kbps | 120 kbps | 250 kbps | 460 kbps |
| ESD Protection | ±2 kV (HBM) | ±2 kV (HBM) | ±15 kV (HBM) | ±15 kV (HBM) |
| Shutdown Current | 1 µA | 1 µA | 1 µA | 1 µA |
Wichtigste Unterscheidungsmerkmale
- Higher driver/receiver count (vs. ADM3202ARUZ)
- Wide supply voltage range (vs. MAX3243ECAI)
- Lower ESD protection (vs. MAX3243ECAI)
Designhinweise
Place the four charge pump capacitors (0.1 µF) as close as possible to the ST75185CTR pins (C1+, C1-, C2+, C2-) to minimize noise and ensure stable voltage generation. Use low-ESR ceramic capacitors for best performance. Keep the traces short and wide to reduce parasitic inductance.
The ST75185CTR operates from a 3.3V or 5V supply. Ensure the supply voltage is within the specified range and has adequate decoupling. A 0.1 µF capacitor on the VCC pin is recommended. The charge pump generates ±10V internally, so no external negative supply is needed.
Do not exceed the absolute maximum ratings, especially on the RS-232 pins. The receiver inputs can handle ±30V, but the transmitter outputs should not be shorted to ground for extended periods. Use the shutdown pin to reduce power consumption when idle. Ensure the charge pump capacitors are correctly polarized if using electrolytic types (though ceramic is recommended).
Compliance-Informationen
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified. Halogen-free status not specified in available data.
