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Screw/Twist Lock IC Development Sockets
The Screw/Twist Lock socket targets IC or system development applications where the IC will not be changed frequently. The socket lid utilizes a set of screws to fasten itself to the socket body. Depending on the IC package style, the screws need not be fully removed in order to loosen the lid and remove the DUT. A torque screwdriver is required to ensure the IC makes contact with the the socket pins without overtightening the lid. The lid material is typically manufactured from FR-4 or aluminum, providing for heatsink capability. The aluminum heatsink can be made flat or finned, depending on the power dissipation requirements and system airflow. Furthermore, the lid can be made with a central cutout to allow for probing, heat dissipation, application of a thermal head, etc.
ET's 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.
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| SMT (-28, -29, -30) |
Through-Hole (-70) | Compression (-90) |
SOCKET BODY VERTICAL OFFSET
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.
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Pitch
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Vertical Offset Using Special Raised SMT
(-28)
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Vertical Offset Using Raised SMT
(-29)
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Vertical Offset Using Standard SMT
(-30)
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0.50-0.75
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N/A
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2.3
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0.4
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0.8
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4.5
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2.8
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0.6
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1.00
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4.5
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3.2
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0.8
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1.27
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N/A
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5.0
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1.2
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Dimensions in mm
FEATURES & BENEFITS
- 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 via lid cut-out or 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
ADDITIONAL INFORMATION
Please note that the Screw/Twist Lock Socket requires the use of a torque screwdriver to mount the lid. The maximum allowed torque on these retention screws is 7cN-m (10oz-in) for sockets up to 800 pins and 10cN-m (14oz-in) for sockets greater than 800 pins. Please view the Torque Screwdriver pages linked to below for more information.
TEST REPORTS
| 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 |
1,000
cycles minimum
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| Solderability |
Exceeds MIL-STD-202 Method 208 |
| Individual Contact Force |
40 grams max. |
| Max Torque for Retention Screws |
10cN-m (10ozf-in): ≤800 pin sockets
7cN-m (14ozf-in): >800 pin sockets |
| Materials |
| Lid |
Glass epoxy FR4 or Aluminum |
| 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
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