Thermal - Heat Sinks

Part Number	Description / PDF	Quantity
325705B00000G Aavid	TO-5 PUSH-ON HEATSINK 6.35MM	7365
7139DG Aavid	HEATSINK TO-220 TIN CLIP-ON 13MM	2928
782202F00000G Aavid	78220 EXTRUSION 2.36X1.18"X4.1'	12
6230DG (COPPER) Aavid	HEATSINK COPPER TO-220 W/TABS	2229
574902B03300G Aavid	HEATSINK TO-220 VERT MNT W/TAB	13177
574602B03700G Aavid	HEATSINK TO220 VER MNT W/TAB.69"	2500
342949 Aavid	COPPER HEATSINK 80X80X12MM	64
533002B02551G Aavid	HEATSINK TO-220 SOLDERPIN/CLIP	394
507302B00000G Aavid	HEATSINK TO-220 2.5W LOW PROFILE	0
747652F00000G Aavid	74765 EXTRUSION 1.025X4.235"X5'	23
374624B00032G Aavid	HEATSINK BGA 35X35X10MM W/ADH	12
507002B00000G Aavid	HEATSINK TO-220 BLK	20372
780802F00000G Aavid	78080 EXTRUSION 2.36X1.06"X4.1'	3
7023BG Aavid	BOARD LEVEL HEAT SINK	6761
PF720 Aavid	MRP/PF-720	1680
627252F00000 Aavid	62725 EXTRUSION 2.28X9.75"X4.62'	7
563002D00000G Aavid	HEATSINK TO-220 TAB TIN	1037
615652F00000G Aavid	61565 EXTRUSION 0.19X0.25"X4'	28
6222BG Aavid	BRIDGE RECTIFIER HEATSINK 0.142"	3058
M48079B011000G Aavid	MAX CLIP HEATSINK	954

Thermal - Heat Sinks

1. Overview

Thermal heat sinks are passive or active cooling components designed to absorb and dissipate heat generated by electronic devices. They play a critical role in maintaining optimal operating temperatures for semiconductors, processors, and power modules. As modern electronics trend toward higher power density and miniaturization, effective thermal management through heat sinks has become essential for ensuring reliability, performance, and longevity of systems in applications ranging from consumer electronics to industrial machinery.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Passive Air-Cooled Heat Sinks	Aluminum/copper fins without moving parts	Desktop CPUs, LED lighting
Active Air-Cooled Heat Sinks	Fans integrated with fin arrays	Gaming PCs, industrial control cabinets
Liquid-Cooled Heat Sinks	Internal channels for coolant circulation	Data center servers, EV battery packs
Heat Pipe Heat Sinks	Vapor chamber technology for ultra-thin profiles	Smartphones, aerospace electronics
Phase Change Heat Sinks	Paraffin-based materials absorbing latent heat	Short-duration high-load applications

3. Structure and Components

Typical heat sink structures include:

Finned Arrays: Corrugated metal surfaces (aluminum extrusions or folded copper sheets) for maximizing surface area
Base Plates: Machined or forged bases with micro-channel patterns for direct component contact
Thermal Interface Materials (TIMs): Graphite pads or phase-change materials between heat sink and component
Mounting Hardware: Spring-loaded pins or adhesive backers for secure installation
Protective Coatings: Anodized finishes or nickel plating for corrosion resistance

4. Key Technical Specifications

Parameter	Description	Importance
Thermal Resistance	0.5-10 C/W range depending on design	Directly impacts cooling efficiency
Material Conductivity	Al: 180-240 W/m K \| Cu: 390-400 W/m K	Determines heat transfer speed
Fin Density	5-50 fins per inch (FPI)	Affects airflow resistance and surface area
Operating Temperature	-50 C to +250 C typical range	Defines environmental suitability
Weight	50g-10kg depending on application	Critical for aerospace and mobile uses

5. Application Fields

Consumer Electronics: CPU/GPU cooling in computers, smartphone SoC thermal pads
Telecommunications: 5G base station power amplifiers, optical transceivers
Industrial: VFD motor controllers, welding equipment
Automotive: Electric vehicle (EV) battery packs, onboard chargers
Aerospace: Avionics cooling systems, satellite power modules

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Aavid (TE Connectivity)	HiK Plate Heat Sinks	Embedded heat pipes, thermal conductivity >400 W/m K
Cooler Master	Hyper 212 RGB	4 direct-contact heat pipes, 64 CFM fan
Delta Electronics	CD7010 Liquid Cooler	2-phase immersion cooling system
Thermaltake	Floe Riing RGB 360mm	360mm radiator with RGB lighting
Boyd Corporation	Phase Change PCM150	150W thermal capacity for pulsed loads

7. Selection Guidelines

Key considerations include:

Calculate required thermal dissipation using Q = (T_operating - T_ambient)/R_thermal
Verify dimensional compatibility with component footprint and clearance
Assess environmental conditions (humidity, vibration, corrosion potential)
Balance performance vs cost: Extruded aluminum offers best cost/performance ratio
Consider integration with existing cooling systems (e.g., existing fan airflow rates)

Case Study: For a 150W CPU with 70 C max operating temperature and 25 C ambient, required thermal resistance must be 0.3 C/W. Recommended solution: Copper base heat sink with 6 heat pipes and 120mm PWM fan.

8. Industry Trends

Emerging developments include:

Graphene-enhanced composites achieving 500+ W/m K conductivity
3D-printed lattice structures reducing weight by 40% while maintaining performance
Smart heat sinks with embedded thermal sensors and adaptive fan control
Two-phase immersion cooling systems for data centers (up to 90% energy savings)
Microchannel liquid cooling for 5G millimeter-wave transmitters

Market forecasts predict a CAGR of 6.8% through 2030, driven by EV and 5G infrastructure demands.