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SMAJ45CA from FAIRCHILD,Fairchild Semiconductor

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SMAJ45CA

Manufacturer: FAIRCHILD, MICROSEMI, CONCORD, RECRON

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS

Partnumber Manufacturer Quantity Availability
SMAJ45CA FAIRCHILD, MICROSEMI, CONCORD, RECRON 211000 In Stock

Description and Introduction

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS The SMAJ45CA 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 (V₄):** 45V  
- **Voltage - Breakdown (Min):** 50V  
- **Voltage - Clamping (Max) @ Iₚₚ:** 73.2V at 24.2A  
- **Peak Pulse Current (Iₚₚ):** 24.2A (8/20µs waveform)  
- **Power - Peak Pulse:** 600W (8/20µs)  
- **Operating Temperature Range:** -55°C to +150°C  
- **Package:** DO-214AC (SMA)  

### **Description:**  
The SMAJ45CA is a bidirectional TVS diode designed to protect sensitive electronics from high-voltage transients, including electrostatic discharge (ESD), lightning, and inductive load switching. It meets IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) standards.  

### **Features:**  
- **Bidirectional protection** (clamps both positive and negative transients).  
- **Low clamping voltage** for improved circuit protection.  
- **Fast response time** (typically <1ps).  
- **High surge capability** (600W peak pulse power).  
- **RoHS compliant** and halogen-free.  
- **Automotive-grade** (AEC-Q101 qualified).  

This diode is commonly used in **power supplies, communication ports, automotive systems, and industrial electronics** for transient suppression.  

(Note: Fairchild Semiconductor was acquired by ON Semiconductor in 2016, but legacy part numbers like SMAJ45CA remain in use.)

Application Scenarios & Design Considerations

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS

Alternative Part Number

  • P6SMB51CA --: Bidirectional TVS diode in SMB package with comparable 51V standoff and similar clamping performance, widely available and a common drop-in substitute for SMAJ45CA.
  • SMBJ45CA --: Bidirectional 45V standoff TVS in SMB (DO-214AA) package matching the SMAJ45CA voltage rating and power class, from a different series and manufacturer.
  • 1SMB45CAT3G --: Bidirectional 45V TVS diode in SMB package with equivalent surge rating, offering a distinct part numbering series as an alternative to the Fairchild SMAJ45CA.
  • 1.5SMC47CA --: Bidirectional 1500W TVS with a nearby standoff voltage, providing robust surge protection as an alternative to the SMAJ series.
  • SMAJ45CA-E3/61 --: Same SMAJ series bidirectional 45V TVS diode with identical 400W peak pulse rating, widely available and drop-in compatible.
  • P6SMB45CA --: Bidirectional 45V TVS in SMB package with 600W surge capability, higher power margin and similar clamping voltage.

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