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SMAJ28CA from ST,ST Microelectronics

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SMAJ28CA

Manufacturer: ST, CONCORD, VISHAY, MICROSEMI, FAIRCHILD

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS

Partnumber Manufacturer Quantity Availability
SMAJ28CA ST, CONCORD, VISHAY, MICROSEMI, FAIRCHILD 165000 In Stock

Description and Introduction

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS The SMAJ28CA is a transient voltage suppressor (TVS) diode manufactured by Fairchild Semiconductor (now part of ON Semiconductor). Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Voltage - Reverse Standoff (V_RWM):** 28V  
- **Voltage - Breakdown (V_BR):** 31.1V (min)  
- **Voltage - Clamping (V_C):** 45.4V at 10A (I_PP)  
- **Peak Pulse Current (I_PP):** 10A (8/20µs waveform)  
- **Power - Peak Pulse (P_PP):** 400W  
- **Operating Temperature Range:** -55°C to +150°C  
- **Package:** DO-214AC (SMA)  

### **Description:**  
The SMAJ28CA is a bidirectional TVS diode designed to protect sensitive electronics from voltage transients, including ESD, lightning, and inductive load switching. It clamps transient voltages to safe levels, preventing damage to downstream components.  

### **Features:**  
- **Bidirectional Protection:** Guards against both positive and negative voltage transients.  
- **Low Clamping Voltage:** Ensures effective suppression of high-energy transients.  
- **Fast Response Time:** Reacts quickly to transient events (picosecond range).  
- **High Surge Capability:** Withstands repetitive high-energy pulses.  
- **RoHS Compliant:** Meets environmental standards.  

This diode is commonly used in power supplies, communication systems, and industrial applications for surge protection.  

*(Note: Fairchild Semiconductor was acquired by ON Semiconductor in 2016, but legacy part numbers like SMAJ28CA remain in use.)*

Application Scenarios & Design Considerations

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS

Alternative Part Number

  • P6SMB28CA --: Same 28V bidirectional TVS in SMB package with comparable clamping voltage and power rating; widely available drop-in alternative.
  • SMBJ28CA --: Bidirectional 28V TVS diode in SMB (DO-214AA) package with 600W peak pulse power, matching the SMAJ28CA's electrical role.
  • 1SMB28CAT3G --: Bidirectional 28V TVS in SMB package from a different series, suitable replacement with similar surge capability.
  • P6SMB30CA --: Bidirectional TVS diode in SMB package with comparable 28V standoff class and similar clamping performance, widely available from a major supplier.
  • 1SMB30CAT3G --: SMB bidirectional TVS diode with close standoff voltage and comparable peak pulse power, offering a different series naming for easy distinction.
  • P6SMB36CA --: Bidirectional TVS diode in SMB package with comparable 28V standoff class and similar clamping performance; widely available and pin-compatible.

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