Year: 2025

TDA7498 Datasheet -100-watt Dual BTL Audio Amplifier

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Part Number: TDA7498TR

Function: 100-watt + 100-watt dual BTL class-D audio amplifier

Package: PowerSSO36 Type

Manufacturer: STMicroelectronics

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TDA7498 datasheet pdf

Description

The TDA7498 is a dual BTL class-D audio amplifier with single power supply designed for home systems and active speaker applications. It comes in a 36-pin PowerSSO package with exposed pad up (EPU) to facilitate mounting a separate heatsink.

 

Pinout

tda7498-datasheet-pinout

 

 

Features

1. 100-W + 100-W output power at THD = 10% with RL = 6 Ω and VCC = 36 V

2. 80-W + 80-W output power at THD = 10% with RL = 8 Ω and VCC = 34 V

3. Wide-range single-supply operation (14 – 39 V)

4. High efficiency (η = 90%)

5. Four selectable, fixed gain settings of nominally 25.6 dB, 31.6 dB, 35.1 dB and 37.6 dB

6. Differential inputs minimize common-mode noise

7. Standby and mute features

8. Short-circuit protection

9. Thermal overload protection

10. Externally synchronizable

 

Official Homepage: http://www.st.com/en/audio-ics/tda7498.html

 

TDA7498 Datasheet

NAS1351 Datasheet PDF – Socket Head Cap Screw

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Part Number: NAS1351

Function: Socket Head Cap Screw

Manufacturer: Aerospace Industries Association

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NAS1351 image

Description

The NAS1351 is a high-strength socket head cap screw standardized by the Aerospace Industries Association, typically manufactured from alloy or corrosion-resistant steel for demanding mechanical applications. It features UNRF-3A threads and is designed to meet stringent aerospace fastener specifications, including optional self-locking elements with specific head markings. This fastener is widely used in aerospace structures, high-reliability assemblies, and precision mechanical systems.

Features

  • Socket head cap screw design for high torque applications
  • Manufactured according to aerospace NAS standards
  • UNRF-3A thread form for high-strength fastening
  • Optional self-locking element with six-dot head marking identification
  • Available in alloy, corrosion-resistant, and heat-resistant steel
  • Designed for high reliability and structural integrity

NAS1351 datasheet pdf

Design Notes

  • Ensure correct torque specification based on material and thread size
  • Self-locking versions require inspection of head marking (six dots)
  • Material selection should match environmental and thermal requirements
  • UNRF threads provide improved fatigue resistance in high-stress joints
  • Proper lubrication or coating may be required to prevent galling

Typical Circuit Usage

  • Mechanical fastening in aerospace assemblies
  • High-strength structural joints
  • Precision equipment mounting
  • Vibration-resistant fastening with self-locking variants
  • High-temperature mechanical assemblies

How to Choose This Part

  • Select based on required strength and environmental conditions
  • Choose appropriate material (alloy, stainless, heat-resistant)
  • Verify thread compatibility (UNRF-3A) with mating components
  • Determine if self-locking feature is necessary
  • Consider corrosion resistance and temperature exposure

Applications

  • Aerospace structural assemblies
  • Aircraft engine components
  • Defense and military equipment
  • High-reliability industrial machinery
  • Precision mechanical systems

Alternative / Equivalent Products

  • NAS1352 socket head cap screw (fine thread variant)
  • MS16995 aerospace socket head screw
  • AN500 series machine screws
  • ISO 4762 metric socket head cap screws
  • ASTM A574 high-strength socket head screws

NAS1351 Datasheet PDF

NAS1351 pdf