Overview
The CM1224-04SO, produced by onsemi, is a member of the CM1224 family of low capacitance ESD (Electrostatic Discharge) protection arrays. These devices are designed to provide robust ESD protection for electronic components or subsystems that require minimal capacitive loading. The CM1224-04SO is particularly suited for high-speed data and clock rate applications, such as USB 2.0, IEEE1394 (Firewire), Serial ATA, DVI, and HDMI ports. It features a small package footprint and is available in a lead-free, RoHS-compliant SOT23-6 package.
Key Specifications
| Parameter | Rating | Units |
|---|---|---|
| Operating Supply Voltage (VP - VN) | 6.0 | V |
| Operating Temperature Range | -40 to +85 | °C |
| Storage Temperature Range | -65 to +150 | °C |
| DC Voltage at any Channel Input | (VN - 0.5) to (VP + 0.5) | V |
| Package Power Rating (SOT23-6) | 225 | mW |
| Operating Supply Voltage (VP - VN) | 3.3 to 5.5 | V |
| Operating Supply Current | 8.0 | μA |
| Diode Forward Voltage | 0.6 to 0.95 | V |
| Channel Leakage Current | ±0.1 to ±1.0 | μA |
| Channel Input Capacitance | 0.6 to 0.8 | pF |
| Channel Input Capacitance Matching | 0.02 | pF |
| ESD Protection - Peak Discharge Voltage | ±8 kV | kV |
| Channel Clamp Voltage (Positive/Negative Transients) | +10 / -1.8 | V |
| Dynamic Resistance (Positive/Negative Transients) | 1.08 / 0.66 | Ω |
Key Features
- Two or Four Channels of ESD Protection
- Provides ESD Protection to IEC61000-4-2 Level 4 ±8 kV Contact Discharge
- Low Channel Input Capacitance of 0.7 pF Typical
- Minimal Capacitance Change with Temperature and Voltage
- Channel Input Capacitance Matching of 0.02 pF Typical, ideal for differential signals
- Zener Diode Protects Supply Rail and Eliminates the Need for External By-pass Capacitors
- Low Clamping Voltage (VCLAMP) at 10 V
- Low Dynamic Resistance (RDYN) at 1.08 Ω
- Each I/O Pin Can Withstand Over 1000 ESD Strikes
- Available in SOT and MSOP Lead-free Packages
- Pb-Free and RoHS Compliant
Applications
- USB 2.0 Ports at 480 Mbps in desktop PCs, Notebooks, and Peripherals
- IEEE1394 Firewire Ports at 400 Mbps / 800 Mbps
- DVI and HDMI Ports in Notebooks, Set Top Boxes, Digital TVs, LCD Displays
- Serial ATA Ports in Desktop PCs and Hard Disk Drives
- PCI Express Ports
- General Purpose High-speed Data Line ESD Protection
Q & A
- What is the CM1224-04SO used for?
The CM1224-04SO is used to provide ESD protection for electronic components or subsystems that require minimal capacitive loading, especially in high-speed data and clock rate applications.
- What are the key features of the CM1224-04SO?
Key features include low channel input capacitance, minimal capacitance change with temperature and voltage, channel input capacitance matching, and an integrated Zener diode for supply rail protection.
- What is the ESD protection level of the CM1224-04SO?
The CM1224-04SO provides ESD protection up to ±8 kV per the IEC 61000-4-2 standard.
- What are the typical applications of the CM1224-04SO?
Typical applications include USB 2.0, IEEE1394 Firewire, DVI, HDMI, Serial ATA, and PCI Express ports.
- What package options are available for the CM1224-04SO?
The CM1224-04SO is available in a 6-lead SOT23-6 package with lead-free finishing.
- Is the CM1224-04SO RoHS compliant?
- How should the CM1224-04SO be placed in a PCB layout to maximize ESD protection?
The ESD protection array should be located as close as possible to the point of entry of expected electrostatic discharges, with minimal PCB trace lengths to the power supply, ground planes, and between the signal input and the ESD device.
- What is the significance of the integrated Zener diode in the CM1224-04SO?
The integrated Zener diode protects the supply rail against ESD strikes and eliminates the need for an external bypass capacitor.
- What is the dynamic resistance of the CM1224-04SO?
The dynamic resistance is 1.08 Ω for positive transients and 0.66 Ω for negative transients.
- How many ESD strikes can each I/O pin of the CM1224-04SO withstand?
Each I/O pin can withstand over 1000 ESD strikes.
