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B69812-N2457-C201

Manufacturer: EPCOS

2 - Pole Filter for W - LAN

Partnumber Manufacturer Quantity Availability
B69812-N2457-C201,B69812N2457C201 EPCOS 18932 In Stock

Description and Introduction

2 - Pole Filter for W - LAN The part B69812-N2457-C201 is manufactured by TDK. It is an NTC thermistor designed for temperature sensing and compensation applications. Key specifications include:

- **Resistance at 25°C (R25):** 10 kΩ ± 1%  
- **B25/85 Value:** 3435 K ± 1%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Maximum Power Rating:** 50 mW  
- **Thermal Time Constant:** ≤ 7 s (in still air)  
- **Dielectric Strength:** 250 V AC (1 min)  
- **Lead Material:** Tinned copper  
- **Package Type:** Radial leaded, epoxy-coated  

This thermistor is commonly used in automotive, industrial, and consumer electronics for precise temperature measurement and control.  

For detailed datasheets or further technical support, refer to TDK's official documentation.

Application Scenarios & Design Considerations

2 - Pole Filter for W - LAN# Technical Documentation: B69812N2457C201 Electronic Component

## 1. Application Scenarios

### Typical Use Cases
The B69812N2457C201 is a  high-performance power management IC  primarily employed in:
-  DC-DC voltage regulation systems  requiring precise output control
-  Battery-powered devices  where efficient power conversion is critical
-  Industrial automation systems  demanding reliable power supply under varying load conditions
-  Telecommunications equipment  requiring stable voltage regulation in noisy environments

### Industry Applications
-  Automotive Electronics : Engine control units, infotainment systems, and advanced driver assistance systems (ADAS)
-  Industrial Control Systems : PLCs, motor drives, and process control instrumentation
-  Consumer Electronics : High-end audio/video equipment, gaming consoles, and portable devices
-  Medical Devices : Patient monitoring equipment and portable diagnostic tools
-  Renewable Energy Systems : Solar inverters and battery management systems

### Practical Advantages and Limitations

#### Advantages:
-  High Efficiency  (typically 92-95% across operating range)
-  Wide Input Voltage Range  (4.5V to 36V)
-  Excellent Thermal Performance  with integrated heat dissipation
-  Robust Protection Features  including over-current, over-voltage, and thermal shutdown
-  Compact Footprint  suitable for space-constrained applications

#### Limitations:
-  Limited Maximum Current  (up to 3A continuous)
-  Requires External Components  for full functionality
-  Sensitive to PCB Layout  for optimal performance
-  Higher Cost  compared to basic linear regulators

## 2. Design Considerations

### Common Design Pitfalls and Solutions

#### Pitfall 1: Inadequate Thermal Management
 Problem : Overheating leading to premature failure or performance degradation
 Solution : 
- Implement proper heatsinking using thermal vias
- Ensure adequate copper area around thermal pad
- Maintain ambient temperature below specified maximum

#### Pitfall 2: Input/Output Capacitor Selection
 Problem : Instability or excessive ripple voltage
 Solution :
- Use low-ESR ceramic capacitors close to IC pins
- Follow manufacturer's recommended capacitance values
- Consider temperature coefficients for reliable operation

#### Pitfall 3: Feedback Network Accuracy
 Problem : Output voltage inaccuracy or drift
 Solution :
- Use 1% tolerance resistors for feedback divider
- Keep feedback traces short and away from noise sources
- Implement proper grounding techniques

### Compatibility Issues with Other Components

#### Digital Components:
-  Noise Sensitivity : May require additional filtering when used with sensitive analog circuits
-  Ground Bounce : Proper decoupling essential when sharing power rails with digital ICs
-  EMI Considerations : May generate switching noise affecting nearby RF components

#### Analog Components:
-  Voltage Reference Accuracy : Compatible with precision references up to 0.1%
-  Signal Chain Integration : Works well with op-amps and ADCs when proper filtering is implemented

### PCB Layout Recommendations

#### Power Stage Layout:
```
+-----------------+
| Input Caps      |   Keep input capacitors
| IC              |   close to VIN and GND
| Output Caps     |   pins
+-----------------+
```

 Critical Guidelines :
-  Minimize Loop Areas : Keep high-current paths short and direct
-  Thermal Management : Use multiple vias under thermal pad for heat dissipation
-  Component Placement : Position feedback components away from switching nodes
-  Ground Plane : Implement solid ground plane for noise reduction
-  Trace Width : Use appropriate trace widths for current carrying capacity

#### Signal Routing:
- Separate analog and power grounds
- Route feedback signals as differential pairs when possible
- Avoid running sensitive signals parallel to switching nodes

## 3. Technical Specifications

### Key Parameter Explanations

#### Electrical Characteristics:
-

Alternative Part Number

  • B39162-B2457-C201 --: Same EPCOS SAW filter family with matching center frequency and package, direct functional drop-in.
  • B69812-N2457-C210 --: Same B69812 series SAW duplexer/filter with a minor revision code, electrically compatible.
  • SF2457C201 --: Equivalent 2457 MHz SAW filter from Murata with comparable insertion loss and package footprint.
  • B39162B2457C201 --: Same EPCOS SAW filter family with matching center frequency and bandwidth; drop-in functional equivalent with similar package footprint.
  • B39162B2457C710 --: EPCOS SAW duplexer/filter variant in the same series, electrically compatible for the same RF front-end application.
  • B39162B2457C000 --: Alternative EPCOS SAW filter in the same product line with comparable insertion loss and impedance, suitable as a second-source option.

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