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Knob Lock IC Development Sockets

The Knob Lock socket targets IC or system development applications where the IC will be changed frequently. The socket lid utilizes a locking knob to fasten itself to the socket body. The lid material is typically manufactured from FR-4 or aluminum, providing for heatsink capability.

This patented spring-pin technology and streamlined "standard process" methdology allows us to provide extremely reliable, high quality and high performance IC sockets with a very competitive price and extremely fast lead-time. These sockets operate at up to 3GHz @ -1dB, with low inductance and capacitance of <2nH and <1pF. The standard delivery for these sockkets is 5-weeks, but they can be ordered on a rush basis in 5, 7, 10 or 15-day production times, not including shipping.

These sockets are available for almost any IC package style, size, lead-count and lead-pitch down to 0.5mm pitch: BGA, MLF/QFN, uBGA, SOIC, QFP and also custom packages or die. Furthermore, these sockets provide flexibility in the PCB mounting method: SMT, raised SMT, through-hole, or compression mount.
  • SMT (pin type -30) uses a standard reflow process to mount the sockets to the target PCB. These sockets mount in the same footprint as the IC, but typically require a mimimum clearance of 6mm betyond the package's periphery. In situations where adjacent components lie in this area, either the socket body can be modified to clear the components, or a special raised SMT (pin types -28 or -29) pin can be used in place of the standard SMT pin. These pins raise the socket body from 2-5mm above the PCB. Although this method does not require any drilled holes in the target PCB, it is highly recommended to provide two such plated holes in order to accomodate mounting pegs and greatly strengthen the physical connection between the socket and PCB. Alternatively, epoxy can be used to strengthen the connection, but this more or less creates a permanent bond between the socket and PCB.
  • Through-hole (pin type -70) requires plated holes to be drilled in the PCB into which the pins of the socket will be soldered. This provides for a very robust and reliable electrical and mechancial connection. However, the electrical performance is reduced due to the longer pin lengths. This method is highly suitable for burn-in applications.
  • Compression (pin type -90) mount removes the need for any soldering and just requires the socket to be held to the PCB via screws. The benefit of this method is that it allows the customer to easily attach the socket to the target board in the lab, without the extra cost, lead-time, and potential problems caused by sending the board to an assembly house. However, this method requires that the target PCB has mounting holes drilled to accomodate the mounting screws and socket body alignment posts. Furthermore, depending on the size of the IC, the PCB thickness, etc., a backing plate is required to provide rigidity and ensure the socket pins contact the PCB pads. This plate can usually be modified to accomodate any backside compononents.
SMT (-28, -29, -30) Through-Hole (-70)Compression (-90)


The following table shows the vertical clearance of the socket body from the PCB. This is only applicable to the SMT mounting style. In situations where the clearance is insufficient, or the standard SMT pin is preferred, it is possible to modify the socket body to accomodate for adjacent components.
Pitch Vertical Offset Using Special Raised SMT
Vertical Offset Using Raised SMT
Vertical Offset Using Standard SMT
0.50-0.75 N/A 2.3 0.4
0.8 4.5 2.8 0.6
1.00 4.5 3.2 0.8
1.27 N/A 5.0 1.2
Dimensions in mm


  • Easily exchange ICs in your system
  • High bandwidth: 3GHz @ -1dB
  • Available for any IC package style: BGA, uBGA, CSP, QFN/MLF, LGA, PGA, SOIC, QFP, custom or die
  • Any lead count, grid and package size
  • Minimum 0.5mm lead pitch
  • Maximum 40g force per contact
  • Mounts to same PCB footprint as the IC (no holes required for SMT version)
  • Low profile: <10mm high with IC
  • Minimal keepout area: approx. 6mm beyond ICs periphery
  • Raised SMT version available for lifting socket over adjacent components
  • Heat dissipation integrated heatsink
  • Thermal expansion, shock & vibration absorbed by contact design
  • LGA contact design can also be used for board-to-board connections
  • Standard-process design & manufacturing = lower cost and tailored to your needs
  • Available 5, 7, 10 or 15-day rush service; 5-week standard delivery ARO



Electrical Specifications
-1dB Bandwidth >3GHz
Inductance < 2nH
Capacitance < 1pF
Contact Resistance < 100mΩ
Insulation Resistance @ 500VDC 100MΩ for 0.5mm to 0.8mm pitch
500MΩ for 0.8mm pitch and above
Current Rating 500mA max.
Breakdown Voltage at 60Hz 500V min.
Mechanical Specifications
Contact Life 10,000 cycles minimum
Retention System Life 10,000 cycles minimum
Solderability Exceeds MIL-STD-202 Method 208
Individual Contact Force 40 grams max.
Body Glass epoxy FR4 or Torlon
Terminal Brass
Contact BeCu
Temperature Rating
Operating Temperature Range –55°C to +125°C
Maximum Temperature +260°C for 60sec

Socket Examples

Please note that these sockets are typically made to order, and you are required to submit an IC package drawing in order to receive a quote. If you don't see a socket that meets your exact needs, please contact us!

BGA Sockets

Pin Count
Chip Size(mm) Grid Size
Socket Style
ET Part#
256 27X27 20X20 Surface Mount BPK-256-2BG020-30
SKT2004PDF Icon
256 27X27 20X20 Thru Hole BPK-256-2BG020-70
SKT2004PDF Icon
352 31.75X31.75 26X26 Surface Mount BPK-352-2BG025-30
SKT1133PDF Icon
388 35X35 26X26 Surface Mount BPK-388-2BG026-30
SKT1716PDF Icon
409 31X31 23X23 Surface Mount BPK-409-2BG023-30
SKT1587PDF Icon
416 35X35 26X26 Surface Mount BPK-416-2BG026-30
SKT2029PDF Icon
416 35X35 26X26 Thru Hole BPK-416-2BG026-70
SKT2029PDF Icon
432 31X31 31X31 Surface Mount BPK-432-2BG031-30
SKT1778PDF Icon
432 31X31 31X31 Thru Hole BPK-432-2BG031-70
SKT1778PDF Icon
456 35X35 26X26 Surface Mount BPK-456-2BG026-30
SKT1732PDF Icon
456 35X35 26X26 Thru Hole BPK-456-2BG026-70
SKT1732PDF Icon
474 35X35 25X25 Surface Mount BCK-474-2BG025-30
SKT1779PDF Icon
474 35X35 25X25 Thru Hole BCK-474-2BG025-70
SKT1779PDF Icon
564 40X40 30X30 Surface Mount BPK-564-2BG030-30
SKT1995PDF Icon
564 40X40 30X30 Thru Hole BPK-564-2BG030-70
SKT1995PDF Icon
675 27X27 26X26 Surface Mount BPK-675-2BG026-30
SKT1782PDF Icon

Pin Count
Chip Size(mm) Grid Size
Socket Style
ET Part#
452 31X31 30X30 Surface Mount BPK-452-3BG030-30
SKT2310PDF Icon
1849 45X45 43X43 ThruHole BPK-1849-3BG043-30
SKT2076PDF Icon
1849 45X45 43X43 Thru Hole BPK-1849-3BG043-70
SKT2076PDF Icon

Pin Count
Chip Size(mm) Grid Size
Socket Style
ET Part#
409 14X14 26X26 Thru Hole BPK-409-5BG026-70
F7381PDF Icon
413 13X13 25X25 Compression Socket BUK-413-5BG025-90
SKT2898PDF Icon
417 13X13 25X25 Compression Socket - Base Only BUK-417-5BG025-90-BASE
SKT2945PDF Icon

Knob Lock Socket
Knob Lock Socket

BGA Sockets ASAP Service


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