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SMAJ170A from TAIWANSEMICO

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SMAJ170A

Manufacturer: TAIWANSEMICO, TAIWAN SEMICONDUCTOR, FAIRCHILD, CONCORD, MICROSEMI

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS
Partnumber Manufacturer Quantity Availability
SMAJ170A TAIWANSEMICO, TAIWAN SEMICONDUCTOR, FAIRCHILD, CONCORD, MICROSEMI 120000 In Stock

Description and Introduction

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS The SMAJ170A 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:**
- **Peak Pulse Power (PPP):** 400W (10/1000μs waveform)  
- **Breakdown Voltage (VBR):** 189V (min) – 209V (max)  
- **Standoff Voltage (VRWM):** 170V  
- **Clamping Voltage (VC):** 274V at 1A  
- **Maximum Reverse Leakage Current (IR):** 1μA at VRWM  
- **Operating Temperature Range:** -55°C to +150°C  
- **Junction Capacitance (CJ):** 50pF (typical)  

### **Descriptions:**
- The SMAJ170A is designed to protect sensitive electronics from voltage transients, such as ESD, lightning, and inductive load switching.  
- It is a unidirectional TVS diode, meaning it clamps positive voltage spikes only.  
- The device is housed in a DO-214AC (SMA) package, suitable for surface-mount applications.  

### **Features:**
- **Low Clamping Voltage:** Ensures effective protection for downstream components.  
- **Fast Response Time:** Reacts quickly to transient events (typically <1ps).  
- **High Surge Capability:** Withstands repetitive high-energy transients.  
- **RoHS Compliant:** Environmentally friendly, lead-free construction.  

For detailed datasheet information, refer to Fairchild Semiconductor's official documentation or ON Semiconductor's resources.

Application Scenarios & Design Considerations

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS

Alternative Part Number

  • SMAJ170A-E3/61 --: Same SMAJ series 170V unidirectional TVS diode with identical 400W peak pulse rating, widely available from a major manufacturer.
  • P4SMA170A --: Equivalent 400W SMA-package unidirectional TVS diode with 170V standoff voltage, drop-in replacement footprint.
  • SMAJ170A-TR --: Same electrical specifications in SMA package from a reputable supplier, suitable direct substitute.
  • P6SMB170A --: Same 170V standoff unidirectional TVS in SMB package with comparable 400W-class surge rating; widely available and pin-compatible.
  • SMBJ170A --: Direct SMB unidirectional TVS with 170V standoff and similar clamping voltage; different series naming and well-stocked.
  • 1SMB170AT3G --: SMB unidirectional TVS with 170V standoff and equivalent surge capability; different prefix/series and reliable second source.
  • 1.5SMC170A --: 1500W unidirectional TVS with 170V standoff in SMC package, suitable when higher surge power is acceptable and package size allows.
  • P6SMB200A --: SMB-packaged unidirectional TVS diode with comparable standoff voltage and clamping performance, widely available and a common cross for SMAJ170A.
  • 1.5SMC200A --: Higher-power SMC TVS with 200V standoff that provides similar or better clamping protection and can replace SMAJ170A where board space allows.

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