PCB (Motherboard) for Cache Memory Modules - Specifications and Verification

Product Specifications

Technical details and manufacturing context for PCB (Motherboard)

Definition

Within a Cache Memory Module, the PCB (Motherboard) serves as the core structural and electrical substrate. It is a multi-layered board made of insulating material with conductive copper traces etched onto its surface. Its primary role is to physically mount the cache memory chips (e.g., SRAM), support ICs, decoupling capacitors, and other passive components. It establishes the critical electrical pathways (traces, vias, and planes) that connect these components to the module's edge connector, facilitating data transfer, power distribution, and signal integrity for high-speed cache operations. It is the foundational platform that integrates all discrete parts into a functional memory module unit.

Typical specifications for such PCBs include board dimensions of 244×244 mm (ATX form factor), layer counts ranging from 4 to 12, copper thickness from 35 to 70 µm, minimum trace width/spacing from 0.1 to 0.2 mm, and board thickness from 1.6 to 2.4 mm. Surface finishes may include HASL, ENIG, or OSP. The maximum operating temperature is typically 85–105 °C, storage humidity range is 30–60% RH, dielectric withstanding voltage is 500–1000 V AC, impedance tolerance is ±10%, weight ranges from 0.5 to 1.5 kg, and warpage is ≤0.75%. These values are reference ranges and must be verified for the specific model and application.

Standards such as IPC-6012, IPC-2221, IPC-4552, IPC/JEDEC J-STD-033, and IPC-2141 are often cited as procurement or verification references. However, they do not guarantee that a particular product or supplier is certified or compliant. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The PCB functions by providing a non-conductive base (typically FR-4 epoxy laminate) onto which a patterned network of conductive copper traces is fabricated. These traces form the electrical circuits that connect the pins of the cache memory chips and other components according to the module's specific design schematic. When the module is installed, the gold-plated contacts on the PCB's edge connector mate with the system's memory slot, allowing the cache memory subsystem to communicate with the CPU via the address, data, and control lines routed through the PCB's internal layers.

Common Materials

FR-4 Epoxy Laminate, Copper Foil, Solder Mask, Silkscreen Ink

Technical Parameters

Parameter	Typical range	Notes & selection driver
Board Dimensions	244×244 mm	Standard ATX form factorATX
Layer Count	4–12 layers	Higher layers for complex routingIPC-6012
Copper Thickness	35–70 µm	Affects current carrying capacityIPC-6012
Minimum Trace Width/Spacing	0.1–0.2 mm	Tighter for high-density designsIPC-2221
Board Thickness	1.6–2.4 mm	Standard 1.6mm for most applicationsIPC-6012
Surface Finish	HASL, ENIG, OSP	ENIG for better solderability and flatnessIPC-4552
Max Operating Temperature	85–105 °C	Exceeding may cause delaminationIPC-2221
Storage Humidity Range	30–60 % RH	Outside range may cause moisture absorptionIPC/JEDEC J-STD-033
Dielectric Withstanding Voltage	500–1000 V AC	Minimum insulation resistanceIPC-6012
Impedance Tolerance	±10 %	Critical for high-speed signalsIPC-2141
Weight	0.5–1.5 kg	Depends on layers and size
Warpage	≤0.75 %	Excessive warp affects assemblyIPC-6012

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Copper Traces Part
Form the electrical pathways that connect component pins, carrying signals and power.

Material: Copper
Solder Pads Part
Provide the surface for soldering component leads or balls (e.g., BGA for cache chips) to the PCB.

Material: Copper with surface finish (e.g., ENIG)
Vias Part
Plated-through holes that electrically connect different layers of the PCB.

Material: Copper
Edge Connector Fingers Part
Gold-plated contacts along one edge of the PCB that interface with the system's memory slot.

Material: Copper with Gold plating
FR-4 Laminate Base
The insulating board itself — traces, pads and vias are all formed on it.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Cache Memory Module

View system integration details

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Frequently Asked Questions

What is the primary function of the PCB in a cache memory module?

The PCB provides the physical and electrical foundation for mounting and interconnecting cache memory components, such as SRAM chips, support ICs, and passive components. It routes electrical signals and power between these components and the module's edge connector.

What materials are typically used in the construction of this PCB?

Common materials include FR-4 epoxy laminate as the insulating base, copper foil for conductive traces, solder mask for protection, and silkscreen ink for labeling. These are standard in the industry.

Which standards are relevant for verifying PCB quality?

Relevant standards include IPC-6012 for rigid PCB performance, IPC-2221 for design, IPC-4552 for surface finishes, IPC/JEDEC J-STD-033 for moisture handling, and IPC-2141 for impedance control. These are references for procurement and verification.

How should I verify the specifications for a specific PCB model?

Always consult the legal manufacturer or supplier for the exact values of dimensions, layer count, copper thickness, and other parameters. The numbers provided in the directory are reference ranges and must be confirmed for your application.

Data Basis

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Preliminary Technical Classification

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pressure:	Atmospheric (non-pressurized application)
other spec:	Humidity: 5-95% non-condensing, Vibration: 5-2000 Hz per MIL-STD-810
temperature:	-40°C to +125°C (operational), -55°C to +150°C (storage)

PCB (Motherboard)

Product Specifications

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