HMCG78AHBRA289N - 16GB DDR5-6400 ECC RDIMM | SK Hynix
MPN: HMCG78AHBRA289N ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $85 | $85.00 |
| 10 | $81 | $810.00 |
| 100 | $76.5 | $7,650.00 |
| 500 | $72.25 | $36,125.00 |
| 1,000 | $68 | $68,000.00 |
Drop-in alternatives for HMCG78AHBRA289N — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
HMCG78AGBUA084N
✅ Drop-In✓ In Stock
$38 / Unit
View Datasheet →HMCG78AGBUA081N
✅ Drop-In✓ In Stock
$244.95 / Unit
View Datasheet →HMCG78AEBRA107N
✅ Drop-In✓ In Stock
$399 / Unit
View Datasheet →HMCG78AEBRA168N
✅ Drop-In✓ In Stock
$74 / Unit
View Datasheet →HMCG78CGBSA095N
✅ Drop-In✓ In Stock
$46.5 / Unit
View Datasheet →HMCG78MEBSA092N
✅ Drop-In✓ In Stock
$39.9 / Unit
View Datasheet →HMCG78AHBRA289N Maximum Ratings & Electrical Characteristics
| Memory Capacity | 16 GB |
| Memory Type | DDR5 SDRAM |
| Module Type | 288-Pin ECC Registered DIMM (RDIMM) |
| Data Rate | 6400 MT/s |
| Bandwidth Class | PC5-51200 |
| CAS Latency | CL52 |
| Configuration | 1Rx8 (Single Rank, x8) |
| Operating Voltage | 1.1 V |
| Error Correction | ECC Registered |
| Module Organization | Single-sided 1Rx8 |
| Form Factor | 288-pin DIMM (PC5-51200) |
| Application Segment | Entry-level virtualization, edge compute, small-scale servers |
| Number of Modules per Kit | 1 |
HMCG78AHBRA289N standard Pin Configuration Guide
Complete pinout information for HMCG78AHBRA289N (standard package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for HMCG78AHBRA289N.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
HMCG78AHBRA289N is suitable for 6 applications: Entry-Level Virtualization Hosts, Edge Compute Appliances, Small-Scale Tower and Rack Servers, Embedded Industrial Compute, Storage Controller and Backup Appliance Memory, Network Appliance and SD-WAN Platforms.
Entry-Level Virtualization Hosts
The HMCG78AHBRA289N fits entry-level virtualization hosts where many small VMs share a modest memory pool and bandwidth matters more than per-VM capacity. Its 6400 MT/s data rate (PC5-51200) provides roughly 51.2 GB/s of peak bandwidth per module, feeding hypervisor workloads without the memory controller becoming a bottleneck, while CL52 latency at 1.1V keeps response times acceptable for mixed tenant loads. The on-module ECC registered signaling protects against single-bit errors that would otherwise corrupt VM state across tenants - critical in multi-tenant environments. Populate one module per channel in single-rank 1Rx8 configuration to keep electrical load low; on platforms validated only to DDR5-4800, the module safely down-clocks to the platform's top JEDEC grade, trading bandwidth for compatibility rather than stability.
Recommended
Edge Compute Appliances
Edge compute nodes benefit from the HMCG78AHBRA289N's combination of high bandwidth and low 1.1V operating power. Edge appliances running container workloads, local AI inference pre-processing, or industrial data aggregation need responsive memory without the thermal budget of full datacenter hardware; the DDR5 integrated on-module PMIC improves voltage regulation efficiency versus DDR4, and the 16GB single-rank 1Rx8 organization simplifies population in 2-slot edge platforms. At 6400 MT/s, the module sustains streaming ingest and local analytics concurrently. Registered ECC protects long-running edge services from silent memory corruption that would otherwise require remote intervention - a costly truck-roll in distributed deployments. Verify the edge platform explicitly lists DDR5-6400 RDIMM support, since many edge SKUs qualify only DDR5-4800 grades.
Recommended
Small-Scale Tower and Rack Servers
Small-scale servers - departmental towers and 1U/2U entry racks - are the primary target market for the HMCG78AHBRA289N. These platforms typically provide 4-8 DDR5 RDIMM slots and require registered ECC memory for data integrity in file, print, database, and line-of-business roles. The 16GB 1Rx8 configuration gives a cost-efficient base population (for example, 4x16GB = 64GB) while leaving rank headroom for future expansion. PC5-51200 bandwidth at CL52 delivers responsive database and file-sharing performance, and the registered interface allows all slots to be populated without signal-integrity derating, unlike unbuffered designs. Always populate per the vendor's memory population table and confirm the HMCG78AHBRA289N appears on the platform's qualified vendor list for guaranteed JEDEC timing compliance.
Recommended
Embedded Industrial Compute
Industrial compute nodes - machine-vision controllers, protocol gateways, and factory-floor analytics boxes built on server-class SoCs - can use the HMCG78AHBRA289N where standard RDIMM slots are present. The module's 1.1V DDR5 signaling reduces I/O power versus DDR4 RDIMMs, easing passive-cooling thermal budgets common in sealed industrial enclosures, while ECC registered memory maintains data integrity across years of 24/7 operation with infrequent reboots. At 6400 MT/s, frame buffers for multi-camera machine vision and real-time protocol processing have ample bandwidth headroom. The JEDEC-standard 288-pin form factor also guarantees multi-source sourcing across the product lifecycle. Industrial integrators should validate operation across the enclosure's ambient temperature envelope, as industrial-spec temperature grades must be confirmed with SK Hynix for non-standard ranges.
Recommended
Storage Controller and Backup Appliance Memory
RAID controllers and backup appliances with server-class host processors require registered ECC memory to buffer write caches and deduplication tables reliably. The HMCG78AHBRA289N's 16GB capacity per module supports sizable metadata caches, while 6400 MT/s bandwidth accelerates parity calculation and dedupe hashing throughput. On-module ECC corrects single-bit errors before they reach the application layer - essential where a memory fault during a rebuild could propagate corruption into the backup set itself. The single-rank 1Rx8 organization minimizes memory-controller load in the 4-8 slot configurations typical of storage appliances, and the DDR5 dual 32-bit subchannel architecture improves random-access efficiency for metadata-heavy workloads. Confirm the appliance vendor qualifies DDR5-6400 RDIMMs; otherwise the module down-clocks transparently.
Recommended
Network Appliance and SD-WAN Platforms
Network appliances - SD-WAN edge devices, firewall gateways, and 5G UPF appliances built on server-class silicon - demand reliable memory with high bandwidth for packet processing and flow tables. The HMCG78AHBRA289N's 6400 MT/s rate supports high packet-per-second forwarding with headroom for TLS inspection and deep packet processing, while registered ECC protects flow-state tables and session keys from single-bit corruption that would silently drop live connections. The 1.1V operation suits fanless and short-depth appliance form factors with constrained airflow. Its 16GB capacity typically suffices for branch and mid-range appliance profiles, and the 288-pin JEDEC RDIMM interface enables second-source sourcing across long appliance service lives. Validate the appliance's memory QVL, as networking vendors often qualify a narrow set of SK Hynix MPNs.
Recommended
Recommended Products Summary
Engineering reference data for HMCG78AHBRA289N — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | HMCG78AGBUA084N | HMCG78AGBUA081N | HMCG78AEBRA107N | HMCG78AEBRA168N |
|---|---|---|---|---|---|
| Package | 288-pin DIMM (RDIMM) | 288-pin DIMM (RDIMM) - same | 288-pin DIMM (RDIMM) - same | 288-pin DIMM (RDIMM) - same | 288-pin DIMM (RDIMM) - same |
| Brand | SK Hynix | SK Hynix | SK Hynix | SK Hynix | SK Hynix |
| Memory Capacity | 16 GB | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Data Rate | 6400 MT/s (PC5-51200) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] (lower DDR5 bin per family coding) | [DATA_NEEDED] (lower DDR5 bin per family coding) |
| Module Type | ECC Registered DIMM (RDIMM) | ECC Registered DIMM (RDIMM) | ECC Registered DIMM (RDIMM) | ECC Registered DIMM (RDIMM) | ECC Registered DIMM (RDIMM) |
| CAS Latency | CL52 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Rank / Configuration | 1Rx8 (Single Rank) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Operating Voltage | 1.1 V | 1.1 V (DDR5 standard) | 1.1 V (DDR5 standard) | 1.1 V (DDR5 standard) | 1.1 V (DDR5 standard) |
| Error Correction | ECC Registered | ECC Registered | ECC Registered | ECC Registered | ECC Registered |
Key Differentiators
- Top JEDEC speed grade DDR5-6400 (vs HMCG78AEBRA107N)
- Single-rank 1Rx8 organization (vs HMCG78MEBSA092N)
- Registered ECC with DDR5 on-module PMIC (vs DDR4 RDIMM equivalents (e.g., HMA84GR7CJR4N-XN))
Design Notes
Never mix this DDR5 RDIMM with DDR4 modules or unbuffered DDR5 UDIMMs - the notch keying physically prevents it, and the memory controller architecture differs fundamentally. Within DDR5 RDIMMs, mixing speed grades (e.g., HMCG78AHBRA289N at 6400 MT/s with an HMCG78AEBRA lower bin) is electrically safe but forces the entire channel to the slower common speed. Mixing single-rank and dual-rank modules in one channel is generally allowed but check the platform's population rules. Always consult your server vendor's qualified vendor list (QVL) before deployment.
The HMCG78AHBRA289N operates at 1.1V, lower than the 1.2V of DDR4 RDIMMs. DDR5 moves the power management IC (PMIC) onto the module itself, which improves voltage regulation accuracy and offloads power delivery from the motherboard. Do not attempt to overclock or overvolt RDIMMs in server platforms - registered modules use locked JEDEC profiles read via SPD hub, and non-JEDEC profiles may be rejected by the BIOS or destabilize the registered clock domain. Estimate module power at roughly 3-5W under load per 16GB RDIMM for chassis thermal budgeting.
For maximum bandwidth, populate channels symmetrically: identical MPNs in mirrored channel pairs so the memory controller trains identical timings on both subchannels. The DDR5 dual 32-bit subchannel architecture per DIMM performs best when all populated modules share the same speed grade and rank configuration. Install modules starting from the slot ordering specified in the server manual (usually the white or A1 slots first) - incorrect slot order can leave channels unbalanced and reduce effective bandwidth from the 51.2 GB/s PC5-51200 class rating.
Compliance Information
Compliance details are not stated in the verified distributor data for this module. SK Hynix server memory modules are typically RoHS compliant, but this must be confirmed via the official SK Hynix product page or distributor certificate of conformance before procurement.
