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Differences in the cold and hot pressing processes of molded inductors.-GOTREND





1、What is an molded inductor?

Molded inductor (Molding Choke) consists of a base and a winding body. The base embeds the winding body in metal magnetic powder through pressure casting. SMD pins are directly formed on the surface of the base as leads for the winding body (as shown in Figure 1). 

 

Molded inductor (Molding Choke)

( Figure 1 )
 





2、Features and advantages of molded inductor

Molded inductors, due to their superior stability, possess the following characteristics: miniaturization, high quality, high energy storage, and low resistance.

 

2.1 Performance and stability 
Compared with conventional chip inductors, molded inductor have excellent resistance to large currents and high temperatures, and their stability in circuits is also outstanding. Compared with ordinary traditional assembled chip inductors, it has better reliability and stability, and is widely used in security, automotive, medical, aerospace and other high-tech fields.



2.2  Structural construction 
Molded inductor is made of metal powder pressing, and the structure is simple, suitable for automated production. The coil is fully enclosed and closed-circuit design, which can meet the diverse needs of customers.



2.3 Technology and price 
The workmanship of molded inductor is much more complex than that of traditional chip inductors, so the product yield rate is lower than that of traditional chip inductors, so its price is higher than that of traditional chip inductors. 
However, with the continuous improvement of molded inductor production and R&D technology and the continuous upgrading of automation equipment, the price of molded inductor will become lower and lower, and it has gradually become the first choice of mainstream customers.






3、Process description of molded inductor  

At present, there are two mainstream process processes for molded inductor : cold pressing process and hot pressing process.



3.1 Cold pressing process : 
The early mainstream process as an molded inductor currently mainly appears on large-size molded inductors, which have the advantages of mature process, stable equipment and high production efficiency. 


 


Cold pressing process production flow chart
 






3.2 Hot pressing process : 
With the increasing demand for inductor miniaturization in the market, the molded inductor process is also developing in the direction of small size, but the traditional cold process has certain limitations in the small size process, and the introduction of hot pressing process solves the problem of integral miniaturization.

 

Hot pressing process production flow chart
 

Hot pressing process production flow chart





3.3 The comparison of cold pressing and hot pressing processes of molded inductors is as follows :
 

The comparison of cold pressing and hot pressing processes of molded inductors is as follows

 





4、Classification and description of GOTREND Technology’s molded inductors

 

▶ Molded Inductor Series Specification Search
 

Series GSTC GSTD GSTM GSTL GSFM GSTM2 GSTG GSTJ GSFH GSFT
Launch Time 2008 2012 2014 2020 2021 2023 2023 2023 2023 2023
Powder Material Alloy & Carbonyl Alloy Carbonyl Alloy Alloy Carbonyl Alloy Alloy Carbonyl Amorphous
Powder Source Germany BASF China China China China China China China China China
Wire Type Round Round Round Round Flat Wire Round Round Round Flat Wire Flat Wire
Terminal PAD Type Hoop Hoop Hoop Hoop Direct Wire PAD Hoop Hoop Hoop Direct Wire PAD Direct Wire PAD
Exterior Coating Gray color epoxy No coating Light clear epoxy No coating No coating Light clear epoxy No coating No coating Light clear epoxy Light clear epoxy
Rust Resistance

★★★★

★★★★

★★★★★ ★★★★ ★★★ ★★★★★ ★★★ ★★★★ ★★★ ★★★
Application Follow Vishay、 Cyntec , the first series •Low cost  
•Popular in consumer application.
•Launch for replace GSTC
•Popular in the IPC、Automotive 
•competitively priced against the GSTC
•Excellent rust resistance
 Especially suitable for low DCR •Especially suitable for low DCR 
•Higher price
•Popular in the IPC、automotive
•Competitively priced against the GSTC
•Excellent rust resistance
•Popular in the IPC、automotive
•Competitively priced against the GSTC
•Popular in Consumer application.
•Low Cost, the best choice for alternative materials.
It adopts hot pressing process to achieve excellent performance and high reliability quality of small size, large current, low impedance, and AEC Q-200 certification.
Crossing reference TDX  SPM-DVZ , SPX-V Series  VishaX
IHLX-Series
TDX  SPM-DVZ , SPX-V Series  VishaX
IHLX-Series
EATOX EXLA-Series , CoilcrafX  XEL-Series  TDX  SPM-DVZ , SPM-V Series  VishaX
IHLX-Series
VishaX
IHLX-Series
PulsX  ADCC-Series PulsX  ADCC-Series
Price Level ★★★★ ★★ ★★★ ★★★ ★★★★★ ★★★ ★★ ★★ ★★ ★★★
Delivery 8~12 Weeks 4~8 Weeks 4~8 Weeks 6~10 Weeks 8~12 Weeks 8~12 Weeks 4~8 Weeks 4~8 Weeks 4~8 Weeks 8~12 Weeks
Shipment Ratio 30% 32% 32% 5% 1% 32% 2% 1% 1% 5%


 
Size GSTC GSTD GSTM GSTL GSFM GSTM2 GSTG GSTJ GSFH GSFT
141265                   V
141208   V               V
160808   V               V
201206   V                
201208   V               V
201210   V               V
201608   V               V
201610 V V             V V
201612                   V
252008   V                
252010   V               V
252012 V V             V V
322510                   V
322512   V               V
322520   V               V
3012     V             V
353220   V V             V
4010   V                
4012     V             V
4020 V V V V V V V     V
4030         V         V
5012     V              
5015     V              
5018 V   V              
5020   V V V V          
5030   V   V V V V     V
5050         V          
6010   V                
6012     V              
6015 V V V              
6018 V   V              


 
Size GSTC GSTD GSTM GSTL GSFM GSTM2 GSTG GSTJ GSFH GSFT
6020     V V           V
6024     V V   V        
6030 V V V V V V V      
6040 V   V V            
6050   V V V V V        
6060         V          
7020         V          
7030         V          
7050         V          
7070         V          
8017   V                
8045               V    
8080         V          
1030 V V                
1040 V V V V   V V      
1045 V                  
1050 V V V V            
1060         V          
1010         V          
1235 V                  
1238     V              
1250 V V V V   V        
1260   V V V   V        
1265     V V            
1350 V                  
1580         V     V    
1510         V          
1513         V          
1770   V   V   V   V    
2313       V            
 

Related articles :
• Evolution of Molding Inductor-Low DCR , High Saturation Current 【GSNH Series】
• Analysis of the Relationship between Inductor Q-Factor and ACR
• What is an inductor? What is the definition of an inductor? Overview of inductor characteristics, parameters, and types.

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