NSi8300
NSi8300 is an isolated RS-232 transceiver with 5kVrms isolation, 250kbps data rate, and dual-channel configuration for industrial serial communication.
Product Overview
Description
The NSi8300 is a dual-channel isolated RS-232 transceiver providing complete isolation for serial communication ports. With 5kVrms reinforced isolation and 250kbps data rate, it protects sensitive electronics in industrial and medical applications.
The device includes two independent RS-232 channels, each supporting TX and RX signals with integrated charge pump for generating RS-232 voltage levels. The isolation barrier separates the logic side (microcontroller) from the line side (serial port).
With ESD protection up to +/-15kV, wide operating temperature range, and compliance to TIA/EIA-232-F standard, the NSi8300 is ideal for industrial automation, medical equipment, and point-of-sale systems requiring isolated serial ports.
Product Series
NSi
Primary Application
Industrial automation
Key Features
- Dual-channel RS-232 isolation
- 5kVrms reinforced isolation
- 250kbps data rate per channel
- Integrated charge pump
- +/-15kV ESD protection
- 3.3V and 5V logic compatible
- TIA/EIA-232-F compliant
- No external capacitors required
Specifications
| Interface Standard | RS-232 |
|---|---|
| Isolation Voltage | 5kVrms (reinforced) |
| Working Voltage | 1.5kVrms |
| Data Rate | 250kbps |
| Channels | 2 (TX/RX per channel) |
| ESD Protection | +/-15kV HBM |
| Supply Voltage | 3.3V / 5V |
| Output Voltage | +/-5V typical (RS-232 levels) |
| Operating Temperature | -40C to +85C |
| Package | SSOP-20 |
Applications
Industrial automation
Industrial automation and control
Medical equipment
Medical electronics
Point-of-sale systems
Electronic system design
Test and measurement
Data acquisition and conversion
Building automation
Industrial automation and control
Security systems
Electronic system design
FAE Expert Insights
"The NSi8300 is my standard recommendation for isolated RS-232 applications. The dual-channel configuration is perfect for equipment with multiple serial ports - one IC handles two ports, saving significant PCB space and cost compared to using two single-channel devices. The integrated charge pump eliminates external capacitors, further reducing BOM. I've used this in medical equipment where isolation between patient-connected devices and control electronics is critical. The 5kVrms isolation meets medical safety requirements, and the +/-15kV ESD protection handles the harsh environment of industrial settings. The 250kbps data rate supports all standard baud rates up to 115200 with margin."
Reliable dual-channel RS-232 isolation with excellent ESD protection
— Industrial Communication FAE, BeiLuo
Frequently Asked Questions
What is the maximum cable length for RS-232 using NSi8300?
RS-232 cable length is limited by signal degradation and noise: Standard RS-232 is specified for 15m (50 feet) maximum cable length at 19200 baud. At lower baud rates (9600 or below), longer cables up to 30m may work reliably. At higher baud rates (115200), maximum reliable length may be 5-10m. Factors affecting maximum length: Cable quality - use shielded twisted pair for best results. Noise environment - industrial settings may require shorter cables. Ground potential difference - large ground differences can cause common-mode issues. For longer distances, consider using RS-485 transceivers like NSi1050 which support up to 1200m. The NSi8300 is designed for short-distance point-to-point connections typical of RS-232 applications.
Use NSi8300 for short-distance RS-232 connections (<15m). For longer distances, use NSi1050 RS-485 transceiver.
Does NSi8300 require external capacitors for the charge pump?
No, the NSi8300 includes internal charge pump capacitors, eliminating the need for external components. This is a significant advantage over traditional RS-232 transceivers: Traditional RS-232 transceivers require 4 external capacitors (typically 0.1uF to 1uF) for the charge pump. These capacitors take up PCB space and add BOM cost. The NSi8300 integrates these capacitors internally, providing a true single-chip solution. Benefits of internal capacitors: Reduced PCB area - saves space for other components. Lower BOM cost - no external capacitors to purchase and place. Simplified design - fewer components to source and manage. Improved reliability - fewer external connections means fewer potential failure points. The internal charge pump generates the required +/-5V RS-232 output levels from a single 3.3V or 5V supply, meeting TIA/EIA-232-F specifications.
NSi8300 requires no external capacitors. Simply connect power and signals for immediate RS-232 operation.