ST3485ECDR STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
STMicroelectronics ST3485ECDR is a half-duplex RS-422/RS-485 transceiver operating from a 3 V to 3.6 V supply with differential Schmitt trigger input and 1.5 V minimum output swing. Housed in an SOIC-8 package for industrial networking and field-bus applications. From $0.65 in stock worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- ST3485ECDR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5590(MOQ 100)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3 V to 3.6 V supply range with 1.5 V minimum differential output swing ensures reliable bus signaling in 3.3 V systems without level shifting
- Differential Schmitt trigger receiver input provides superior noise immunity for long-cable RS-485 networks up to 1200 m
- EIA-422 and EIA-485 dual-standard compliance in a single SOIC-8 device simplifies multi-protocol industrial wiring designs
Applications
The ST3485ECDR is designed for industrial RS-485 multi-drop networks connecting PLCs, sensors, and actuators over distances up to 1200 m at data rates up to 10 Mbps. Its 3.3 V supply compatibility makes it a natural fit for microcontroller-based gateway designs where 5 V tolerance is not available. The half-duplex operation suits cost-sensitive fieldbus topologies such as Modbus RTU, DMX512, and PROFIBUS DP where a single differential pair is shared among multiple nodes.
Specifications
| YTEOL | 7.2 |
| Differential Output | YES |
| Driver Number of Bits | 1 |
| Input Characteristics | DIFFERENTIAL SCHMITT TRIGGER |
| Interface IC Type | LINE TRANSCEIVER |
| Interface Standard | EIA-422; EIA-485 |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Out Swing-Min | 1.5V |
| Output Low Current-Max | 0.004A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Qualification Status | Not Qualified |
| Receive Delay-Max | 50ns |
| Receiver Number of Bits | 1 |
| Supply Current-Max | 2.2mA |
| Supply Voltage-Max | 3.6V |
| Supply Voltage-Min | 3V |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| 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 | 30ns |
| 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 | Morocco |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What supply voltage does ST3485ECDR require, and can it interface directly with 3.3 V microcontrollers?
The ST3485ECDR operates from a 3 V to 3.6 V supply, making it directly compatible with 3.3 V microcontroller logic without any level-shifting circuitry. Its logic input thresholds and output levels are aligned with 3.3 V CMOS standards, enabling direct UART-to-RS-485 connections in embedded systems built around 32-bit ARM or similar 3.3 V MCUs.
How far and how fast can an RS-485 network using ST3485ECDR reliably transmit data?
The ST3485ECDR supports data rates up to 10 Mbps for short cable runs, with the cable length inversely scaling with bit rate; at 100 kbps the network can extend up to 1200 m using 120 Ω termination. The differential Schmitt trigger receiver adds noise rejection that maintains signal integrity in electrically noisy industrial environments where common-mode interference can reach ±7 V.
Which industrial protocol applications are best served by the half-duplex architecture of ST3485ECDR?
The half-duplex single differential-pair architecture of the ST3485ECDR directly matches the bus topology used by Modbus RTU, DMX512 lighting control, BACnet MS/TP, and PROFIBUS DP protocols, all of which operate over a shared 2-wire RS-485 bus. These protocols account for the majority of industrial sensor networks and building automation systems, making the ST3485ECDR suitable for up to 32 unit-load nodes without bus repeaters.
How does ST3485ECDR compare to the SN65HVD485 in a 3.3 V RS-485 application?
Both the ST3485ECDR and the SN65HVD485 target 3.3 V RS-485 applications in an SOIC-8 package with similar 10 Mbps data rate capability, but the ST3485ECDR specifies a tighter 3 V to 3.6 V supply range compared to the SN65HVD485 which accepts 3 V to 3.6 V as well; key differentiators are driver propagation delay and ESD protection ratings. Engineers can use either part as a pin-compatible alternative in Modbus or fieldbus designs where 8-pin SOIC footprints are standardized on the PCB.
Related Guides
EEEFK1E470P Selection Guide for 47 uF SMD Aluminum Electrolytic Capacitors
Selection guidance for EEEFK1E470P and nearby Panasonic FK or FT SMD aluminum electrolytic capacitors for power-rail bulk decoupling.
Jul 7, 2026
EEEFT1V101AP Design Guide for SMD Aluminum Electrolytic Bulk Decoupling
Design guidance for using EEEFT1V101AP as an SMD aluminum electrolytic bulk capacitor in power-rail decoupling and hold-up networks.
Jul 7, 2026
How to Choose a 3528 SMD Indicator LED for Blue Status Lighting: Selection Guide
A practical 3528 SMD indicator LED selection guide using 150141BS73100 and related Wurth 150141 variants for blue status lighting.
Jul 5, 2026
BAS70KFILM Design Guide for Low-Leakage Signal Clamping and RF Detector Inputs
Practical BAS70KFILM design guidance for signal clamps, RF detector inputs, leakage control, capacitance, layout, and sourcing alternatives.
Jul 5, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 100+ | $1.0200 | $102.00 |
| 250+ | $0.8749 | $218.72 |
| 500+ | $0.8412 | $420.61 |
| 1000+ | $0.6210 | $621.00 |
| 2500+ | $0.5890 | $1472.50 |
| 7500+ | $0.5590 | $4192.50 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”