ST1480ACDR - 3.3V RS-485/RS-422 Transceiver | STMicroelectronics
MPN: ST1480ACDR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.75 | $750.00 |
Drop-in alternatives for ST1480ACDR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ST1480BDR
β Drop-Inπ Reference alternative (not in catalog)
ST3485EBDR
β Drop-Inπ Reference alternative (not in catalog)
MAX3485
β Drop-Inπ Reference alternative (not in catalog)
ISL83485
β Drop-Inπ Reference alternative (not in catalog)
ADM3485
β Drop-Inπ Reference alternative (not in catalog)
ST1480ACDR Maximum Ratings & Electrical Characteristics
| Supply Voltage | 3.3 V |
| Data Rate | 12 Mbps |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Duplex | Half |
| Common-Mode Input Range | -7 V to +12 V |
| Unit Load | 1/8 |
| Quiescent Current | 900 uA |
| Driver Output Current | 60 mA |
| ESD Protection | 8 kV HBM |
| Operating Temperature | -40C to +85C |
| Package | SOIC-8 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Fail-Safe Receiver | Yes |
ST1480ACDR Pin Configuration
| Pin 1 | RO β Receiver output |
| Pin 2 | RE β Receiver enable (active low) |
| Pin 3 | DE β Driver enable (active high) |
| Pin 4 | DI β Driver input |
| Pin 5 | GND β Ground |
| Pin 6 | A β Non-inverting bus line |
| Pin 7 | B β Inverting bus line |
| Pin 8 | VCC β Power supply (3.3V) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ST1480ACDR is suitable for 6 applications: Industrial Automation, Building Automation, Point-of-Sale Terminals, Security Systems, Remote Sensor Networks, Networking Equipment.
Industrial Automation
The ST1480ACDR is ideal for industrial automation networks where reliable, high-speed data communication is required over long distances. Its 12 Mbps data rate and wide common-mode range (-7V to +12V) ensure robust operation in noisy factory environments. The device can be used in PLCs, motor drives, and sensor networks, providing a simple and cost-effective RS-485 interface. Its 1/8 unit load allows up to 256 nodes on a single bus, enabling large-scale automation systems. The fail-safe receiver ensures data integrity even in fault conditions, reducing downtime and maintenance costs.
Recommended
Building Automation
In building automation systems, the ST1480ACDR provides a reliable communication link for HVAC controllers, lighting systems, and access control panels. Its low quiescent current (900 uA) is beneficial for always-on monitoring applications. The wide common-mode range and ESD protection (8 kV) ensure reliable operation in electrically noisy environments. The device supports data rates up to 12 Mbps, allowing fast updates for real-time control. Its small SOIC-8 package simplifies PCB layout, and the fail-safe receiver eliminates the need for external bias resistors, reducing component count and cost.
Recommended
Point-of-Sale Terminals
The ST1480ACDR is used in point-of-sale (POS) terminals for communication between the main board and peripherals such as barcode scanners, receipt printers, and cash drawers. Its high data rate (12 Mbps) ensures fast transaction processing, while the 3.3V supply reduces power consumption in battery-backed systems. The device's robust ESD protection (8 kV) is critical in environments where users frequently connect and disconnect cables. The SOIC-8 package allows for compact designs, and the fail-safe receiver prevents data corruption when cables are disconnected.
Recommended
Security Systems
The ST1480ACDR is well-suited for security systems, including access control panels, CCTV controllers, and alarm systems. Its wide common-mode range and ESD protection ensure reliable communication over long cable runs in outdoor or harsh environments. The device's low quiescent current is ideal for battery-backed security systems. The 1/8 unit load allows many devices to be connected on a single bus, simplifying wiring in large installations. The fail-safe receiver ensures that open or shorted lines do not cause false alarms, enhancing system reliability.
Recommended
Remote Sensor Networks
The ST1480ACDR is ideal for remote sensor networks where sensors are distributed over large areas and communicate over RS-485 buses. Its low power consumption (900 uA) is crucial for battery-powered sensors. The wide common-mode range allows sensors to operate with different ground potentials, and the high data rate (12 Mbps) supports fast data acquisition. The device's 1/8 unit load enables up to 256 sensors on a single bus, reducing wiring costs. The fail-safe receiver ensures reliable data transmission even when sensor nodes are powered down.
Recommended
Networking Equipment
The ST1480ACDR is used in networking equipment such as routers, switches, and gateways for management and control communication. Its high data rate (12 Mbps) supports fast configuration and monitoring. The 3.3V supply is compatible with modern networking ICs, and the wide common-mode range ensures reliable operation in data centers with varying ground potentials. The device's ESD protection (8 kV) is essential for equipment that may be handled during installation. The SOIC-8 package is space-efficient, and the fail-safe receiver prevents bus errors during hot-swapping.
Recommended
Recommended Products Summary
Engineering reference data for ST1480ACDR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ST1480BDR | MAX3485 | ISL83485 | ADM3485 |
|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Brand | STMicroelectronics | STMicroelectronics | Maxim Integrated | Renesas Electronics | Analog Devices |
| Supply Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Data Rate | 12 Mbps | 250 kbps | 10 Mbps | 10 Mbps | 10 Mbps |
| Common-Mode Range | -7V to +12V | -7V to +12V | -7V to +12V | -7V to +12V | -7V to +12V |
| Unit Load | 1/8 | 1/8 | 1/8 | 1/8 | 1/8 |
| Quiescent Current | 900 uA | 900 uA | 400 uA | 500 uA | 400 uA |
| ESD Protection | 8 kV HBM | 8 kV HBM | 2 kV HBM | 2 kV HBM | 2 kV HBM |
Key Differentiators
- Higher data rate (12 Mbps) compared to MAX3485 (10 Mbps) (vs MAX3485)
- Superior ESD protection (8 kV HBM) vs 2 kV on MAX3485 (vs MAX3485)
- Wider common-mode range (-7V to +12V) vs -7V to +12V on ISL83485 (vs ISL83485)
Design Notes
Place the ST1480ACDR close to the bus connector to minimize trace length and reduce EMI. Use a 0.1uF decoupling capacitor between VCC and GND, placed as close to the VCC pin as possible. For longer bus lengths, consider adding a 120-ohm termination resistor at both ends of the bus to prevent signal reflections.
Ensure that the DE and RE pins are not both enabled simultaneously in half-duplex operation, as this can cause bus contention. Use a microcontroller to control these pins with proper timing. Also, avoid exceeding the absolute maximum ratings of -0.3V to +3.9V on the supply voltage and -7V to +12V on the bus pins to prevent damage.
The ST1480ACDR has a maximum junction temperature of 150C. In typical operation, power dissipation is low (less than 100 mW), so thermal issues are unlikely. However, in high-temperature environments, ensure adequate PCB copper area for heat dissipation. The SOIC-8 package has a thermal resistance of approximately 150 C/W.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified. Halogen-free status not specified in available data.
