Overview
The ST3485EIDT is a 3.3 V powered, low-power transceiver designed for RS-485 and RS-422 communications, manufactured by STMicroelectronics. This device operates in half-duplex configuration, containing one driver and one receiver. It is notable for its high-speed data transmission capability of up to 12 Mbps and robust ESD protection of ±15 kV IEC 61000-4-2 air discharge and ±8 kV IEC 61000-4-2 contact discharge. The ST3485EIDT is available in an SO8 package and supports a wide temperature range of -40°C to 125°C, making it suitable for various industrial and automotive applications.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 3 | - | 3.6 | V |
| Operating Temperature | -40 | - | 125 | °C |
| Data Rate | 12 | - | - | Mbps |
| ESD Protection | ±15 kV | - | - | IEC 61000-4-2 air discharge |
| ESD Protection (Contact) | ±8 kV | - | - | IEC 61000-4-2 contact discharge |
| Shutdown Supply Current | 0.002 | 1 | - | µA |
| Driver Short-Circuit Output Current | - | - | ±250 | mA |
| Receiver Input Resistance | 24 | - | - | kΩ |
Key Features
- ESD protection: ±15 kV IEC 61000-4-2 air discharge and ±8 kV IEC 61000-4-2 contact discharge.
- Operates from a single 3.3 V supply with no charge pump required.
- Interoperable with 5 V logic.
- Low current shutdown mode: 1 µA maximum.
- Guaranteed 12 Mbps data rate.
- -7 to 12 V common mode input voltage range.
- Half-duplex versions available.
- Industry standard 75176 pinout.
- Current limiting and thermal shutdown for driver overload protection.
- Guaranteed high receiver output state for floating inputs with no signal present.
- Allows up to 64 transceivers on the bus.
- Available in SO8 package.
- Automotive grade (ST3485EIY variant).
Applications
- Industrial automation and control systems.
- Automotive systems (especially the ST3485EIY variant).
- Point-of-sale terminals and other commercial equipment.
- Medical devices requiring reliable serial communication.
- Building automation and security systems.
Q & A
- What is the maximum data rate of the ST3485EIDT?
The ST3485EIDT can transmit and receive data at a guaranteed rate of up to 12 Mbps.
- What is the ESD protection level of the ST3485EIDT?
The device is protected against ±15 kV IEC 61000-4-2 air discharge and ±8 kV IEC 61000-4-2 contact discharge.
- What is the operating voltage range of the ST3485EIDT?
The device operates from a single 3.3 V supply, with a voltage range of 3 V to 3.6 V.
- What is the temperature range of the ST3485EIDT?
The device operates over a temperature range of -40°C to 125°C.
- Is the ST3485EIDT interoperable with 5 V logic?
- What is the shutdown supply current of the ST3485EIDT?
- How many transceivers can be connected on the bus?
- What is the package type of the ST3485EIDT?
- Does the ST3485EIDT have thermal shutdown protection?
- Is the ST3485EIDT suitable for automotive applications?
