DRAM Chips: Capacity 4GB to 64GB per chip, Latency CL14 to CL40

Component Specifications

Definition

Dynamic Random Access Memory (DRAM) chips are integrated circuit components that store data as electrical charges in capacitor-based memory cells. As volatile memory, they require constant refresh cycles to maintain data integrity. In cache memory modules, DRAM chips serve as high-speed temporary storage buffers between the processor and main memory, reducing latency by holding frequently accessed data and instructions. These chips feature a one-transistor-one-capacitor (1T1C) cell structure organized in rows and columns, with access controlled through row and column address strobes.

Working Principle

DRAM chips operate by storing binary data as electrical charges in microscopic capacitors within memory cells. Each cell consists of one transistor (for access control) and one capacitor (for charge storage). When a memory cell is addressed, the transistor activates to allow reading the capacitor's charge state (representing 0 or 1) or writing a new charge. Due to capacitor leakage, stored charges dissipate over milliseconds, requiring periodic refresh cycles where the memory controller reads and rewrites data to maintain it. Data access follows a multiplexed addressing scheme where row addresses are latched first, followed by column addresses to select specific bits within the memory array.

Materials

Silicon wafer substrate, polysilicon gate electrodes, silicon dioxide insulation layers, tungsten or copper interconnects, aluminum or copper bonding pads, tantalum or titanium nitride barrier layers, photoresist materials for lithography, doped semiconductor regions (n-type and p-type silicon).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Latency	CL14 to CL40
Package	FBGA (Fine-pitch Ball Grid Array)
Voltage	1.2V (DDR4), 1.1V (DDR5)
Capacity	4GB to 64GB per chip
Data Rate	3200 MT/s to 8400 MT/s
Interface	Parallel (DDR4/DDR5)
Refresh Rate	7.8μs per row
Temperature Range	0°C to 95°C (Commercial), -40°C to 105°C (Industrial)

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

Standards

JEDEC JESD79 (DDR Standards), IEC 60749, IPC/JEDEC J-STD-020

Parent Products

This component is used in the following industrial products

Cache Memory Module

A dedicated memory component within a RAID controller that temporarily stores frequently accessed data to accelerate read/write operations.

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Engineering Analysis

Risks & Mitigation

Data loss during power interruption
Refresh failure leading to corruption
Signal integrity issues at high speeds
Thermal-induced performance degradation
Electrostatic discharge damage
Row hammer vulnerability

FMEA Triads

Trigger: Capacitor leakage exceeding specifications
Failure: Data corruption and bit errors
Mitigation: Implement error correction codes (ECC), regular refresh cycles, and quality control during capacitor fabrication

Trigger: Address line crosstalk at high frequencies
Failure: Incorrect memory access and system crashes
Mitigation: Implement proper signal isolation, impedance matching, and advanced PCB routing techniques

Trigger: Thermal stress from prolonged operation
Failure: Increased leakage current and reduced data retention time
Mitigation: Incorporate thermal monitoring, adequate heat dissipation, and temperature-compensated refresh rates

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% for voltage specifications, ±100ppm for timing parameters, data retention within specification for 64ms refresh interval

Test Method

JEDEC standard testing procedures including AC/DC parametric tests, functionality tests, burn-in testing, temperature cycling, and signal integrity validation using oscilloscopes and logic analyzers

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of DRAM Chips

Manufacturer profiles associated with DRAM Chips.

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Frequently Asked Questions

What is the difference between DRAM and SRAM in cache applications?

DRAM offers higher density and lower cost per bit but requires refresh cycles, while SRAM provides faster access without refresh but at higher cost and lower density. Cache modules often use DRAM for larger capacity buffers and SRAM for smaller, faster level-1 caches.

Why do DRAM chips need constant refreshing?

DRAM stores data as electrical charges in capacitors that naturally leak charge over time. Refresh cycles (typically every 64ms) read and rewrite data to maintain charge levels, preventing data loss in this volatile memory technology.

How does DDR technology improve DRAM performance?

DDR (Double Data Rate) technology transfers data on both the rising and falling edges of the clock signal, effectively doubling the data transfer rate compared to single data rate memory while maintaining the same clock frequency.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

DRAM Chips