K3UH7H70BM-AGCLT00

Introduction

The K3UH7H70BM-AGCLT00 is a high-performance 8 Gb (1 GB) LPDDR4X (Low Power Double Data Rate 4X) SDRAM memory chip manufactured by Samsung Electronics. As a member of the premium K3U series, it utilizes Samsung's advanced 1y-nm (1J) process technology to deliver a perfect balance of high bandwidth and ultra-low power consumption. This chip is specifically designed for flagship mobile devices, VR/AR headsets, and AI edge computing devices where battery life and processing speed are critical.

The suffix breakdown is as follows:

• K3UH7H70BM: Core model identifier (8Gb LPDDR4X).
• AGCL: Indicates the FBGA package type and specific lead-free/halogen-free configuration.
• T00: Typically denotes a specific revision code, test batch, or manufacturing location code (often associated with specific OEM requirements or later production runs).

Market Status: This model is a mature, high-volume production part widely used in mid-to-high-end smartphones (e.g., Vivo S12) and VR devices (e.g., PICO 4). While it remains available, for new designs, engineers should evaluate migration to LPDDR5 or newer LPDDR4X variants for future-proofing.

Key Features

Core Performance

• High Density: 8 Gb (1 GB) capacity, typically organized as 256M x 32 (256 Megawords x 32-bit I/O).
• High Speed: Supports a maximum data transfer rate of 4266 Mbps (PC4-34100 equivalent), enabling ultra-fast data processing for 4K video, AI, and gaming.
• Low Power: Operates on multi-voltage rails (1.8V / 1.1V / 0.6V) with deep power-down modes, significantly reducing power consumption compared to standard LPDDR4. LPDDR4X specifically lowers I/O voltage to 0.6V to save 10-15% power.
• High Bandwidth: Achieves a peak bandwidth of 17.0 GB/s per chip.

Advanced Architecture & Reliability

• Process Technology: Built on 1y-nm (1J) DRAM process, offering higher density and better performance per watt.
• Signal Integrity:
  • On-Die Termination (ODT): Integrated ODT improves signal quality by matching impedance.
  • Write CRC & Parity: Features Write Cyclic Redundancy Check and parity checking for command/address buses to enhance reliability.
• Refresh Management: Supports Temperature Compensated Self-Refresh (TCSR) and Auto Self-Refresh (ASR) to optimize power based on temperature.
• Training Features: Supports Write Leveling and Read Leveling for fly-by topology to compensate for signal skew.

Package & Environmental Specifications

• Package: 200-ball FBGA with a fine pitch (typically 0.5mm or 0.65mm). Compact footprint suitable for high-density mobile PCBs.
• Temperature Range: Commercial Grade: -25°C to +85°C.
• RoHS Compliant: Lead-free and halogen-free.

Typical Specification Table

Typical Applications

• Flagship Smartphones & Tablets:
  • Used as the main system memory (often paired with another 8Gb chip for 2GB/4GB total) in high-end models like the Vivo S12. Supports 4K video recording and heavy multitasking.
• VR/AR Headsets:
  • Found in devices like the PICO 4 VR headset. The high bandwidth and low power consumption are critical for rendering high-resolution video and maintaining low latency in wireless standalone devices.
• Automotive Electronics:
  • Advanced Infotainment & ADAS: Handles high-speed sensor data processing and runs complex navigation/media software in car dashboards.
• AI Edge Devices:
  • Provides high-speed memory for AI model parameters and real-time inference in smart cameras and drones.

Development & Design Notes

1. PCB Layout:
   • Impedance Control: Strict control of 50Ω single-ended impedance for DQ/DQS signals and 100Ω differential impedance for CK/CA signals is mandatory for 4266 Mbps speeds.
   • Length Matching: Data lines (DQ) must be length-matched to the Strobe (DQS) within ±5mil. Address/Command lines must be matched to the Clock.
   • Layer Stack-up: Recommended 8-layer or 10-layer board with solid ground planes adjacent to signal layers to minimize crosstalk.
2. Power Integrity:
   • LPDDR4X is sensitive to noise. Place decoupling capacitors (0.1µF, 1µF, 10µF) as close as possible to the VDD/VDDQ/VDD2 pins.
   • Strict Power Sequencing: 1.8V (VDDQ) -> 1.1V (VDD2) -> 0.6V (VDD) must be followed to prevent latch-up.
3. Thermal Management:
   • Although power consumption is low, heat is generated during high-speed bursts. Use thermal vias under the FBGA package connected to internal ground planes or top-layer heat spreaders.
4. Initialization:
   • The memory controller must execute a strict power-up sequence, including ZQ calibration (impedance matching) and write/read leveling training, to ensure stable operation.
5. Migration:
   • For new designs, consider the pin-compatible or functional successor K3UH7H70AM-AGCL or migrate to the K3K series (LPDDR5) for higher bandwidth (>6400 Mbps) and better power efficiency.