HMCG78AEBRA168N - 16GB DDR5-4800 ECC RDIMM | SK hynix
MPN: HMCG78AEBRA168N ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $89 | $89.00 |
| 10 | $85.5 | $855.00 |
| 100 | $81 | $8,100.00 |
| 500 | $77.5 | $38,750.00 |
| 1,000 | $74 | $74,000.00 |
Drop-in alternatives for HMCG78AEBRA168N — 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:
HMCG78AEBRA115N
✅ Drop-In✓ In Stock
$49.6 / Unit
View Datasheet →HMCG78MEBSA092N
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$39.9 / Unit
View Datasheet →A-Tech 16GB DDR5-4800 RDIMM PC5-38400R
✅ Drop-In📋 Reference alternative (not in catalog)
HMCG78AEBRA168N Maximum Ratings & Electrical Characteristics
| Capacity | 16 GB |
| Memory Type | DDR5 SDRAM |
| Module Type | 288-Pin ECC Registered RDIMM |
| Data Rate | 4800 MT/s |
| Bandwidth Class | PC5-38400 |
| Organization | 1Rx8 (single rank, x8) |
| CAS Latency | CL40 |
| Operating Voltage | 1.1 V |
| Pins | 288 |
| Error Correction | ECC (on-module, registered) |
| Form Factor | 288-pin DIMM (server class) |
| Application | Enterprise server / workstation |
| JEDEC Compliance | DDR5 RDIMM JEDEC compliant |
| Rank | Single rank |
HMCG78AEBRA168N standard Pin Configuration Guide
Complete pinout information for HMCG78AEBRA168N (standard package) with 288 pins. 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 HMCG78AEBRA168N.
Refer to the datasheet for full pin configuration.
Estimated pin count: 288 pins (digital package)
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
HMCG78AEBRA168N is suitable for 6 applications: Enterprise Rack Servers, Virtualization Hosts, Database Servers, High-Performance Workstations, Blade and Dense Compute Nodes, Memory Fleet Refresh / Spares Pool.
Enterprise Rack Servers
The HMCG78AEBRA168N fits enterprise rack servers that require JEDEC-standard DDR5-4800 RDIMMs, where its 16GB 1Rx8 organization keeps per-channel electrical loading low enough to sustain full 4800 MT/s across all populated channels. The on-module register buffers command/address signals so 16-24 DIMM slots per 2-socket server remain within controller timing budget, and module ECC corrects single-bit errors that would otherwise cause unplanned reboots in always-on infrastructure. At 1.1V per module, a 16-slot server saves meaningful power versus DDR4-3200 RDIMM equivalents. Deploy in matched sets per channel and follow the OEM population-order guide to maintain interleaving.
Recommended
Virtualization Hosts
Virtualization platforms (VMware ESXi, KVM, Hyper-V) benefit directly from the HMCG78AEBRA168N's combination of 4800 MT/s bandwidth and ECC reliability. VM consolidation multiplies memory access concurrency, so the two independent 32-bit DDR5 subchannels per module improve effective bandwidth under mixed read/write workloads versus DDR4. Module-level ECC plus on-die ECC in the underlying DDR5 die protects hypervisor and guest memory pages from soft errors during months of uptime. Populate channels symmetrically with identical 1Rx8 modules so the memory controller runs all channels at the same speed; mixing ranks or vendors can force a common-clock downclock to 4400 or 4000 MT/s.
Recommended
Database Servers
In-memory and buffer-pool-heavy database workloads (OLTP indexes, analytics caches) push sustained sequential bandwidth, which the HMCG78AEBRA168N supplies at PC5-38400 (38.4 GB/s theoretical per module). Single-rank 1Rx8 modules reduce bus turnaround penalties at moderate channel populations, while ECC protects against the silent data corruption that is unacceptable for transactional logs. The 1.1V operation also lowers thermal load inside dense 1U/2U chassis, easing chassis fan curves. Size memory so the working set fits in DRAM; add modules in power-of-two channel groups and verify post-memory-training speed reports in the BIOS to confirm all channels negotiated 4800 MT/s.
Recommended
High-Performance Workstations
Professional workstations certified for RDIMMs (rendering, simulation, FPGA prototyping hosts) accept the HMCG78AEBRA168N where the platform is built on server-class chipsets (Intel Xeon W, AMD Threadripper PRO). Registered buffering lets these platforms populate 8 DIMM slots at full speed - consumer UDIMMs cannot. The 4800 MT/s rate accelerates bandwidth-bound stages such as finite-element solvers and 8K video scrubbing, while ECC prevents silent render corruption during multi-hour jobs. Note that workstation boards often enforce stricter QVLs than servers; confirm 16GB 1Rx8 4800 support in the board's memory list and populate per the 4-DIMM or 8-DIMM interleaving map.
Recommended
Blade and Dense Compute Nodes
Blade chassis and high-density compute trays value the HMCG78AEBRA168N's single-rank 1Rx8 build, which presents minimal electrical load and modest thermal dissipation per slot - important where airflow per blade is constrained. Registered DDR5 modules include an on-module PMIC that regulates the 1.1V DRAM rail locally, isolating module power from slot-supply droop in shared-backplane designs. ECC remains mandatory in this segment because blade nodes often run unattended for years. Follow the chassis vendor's memory population table; dense nodes frequently require balanced rank distribution across all memory controllers to reach advertised memory bandwidth.
Recommended
Memory Fleet Refresh / Spares Pool
For data centers standardizing a spares pool across mixed DDR5 server generations, the HMCG78AEBRA168N is a cost-effective canonical spare: 16GB 1Rx8 1.1V is the most common DDR5-4800 RDIMM population unit, maximizing interchangeability across Dell, HPE, Lenovo, and Supermicro platforms. JEDEC standardization means a JEDEC-compliant module trains at each platform's supported speed automatically, though OEM QVL lockouts should be checked for warranty-sensitive deployments. Keep a 5-10% spare ratio per platform type and store modules in ESD-safe antistatic packaging; DDR5 modules with on-module PMICs are more ESD-sensitive than DDR4 predecessors.
Recommended
Recommended Products Summary
Engineering reference data for HMCG78AEBRA168N — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | HMCG78AEBRA115N | HMCG78MEBSA092N | A-Tech 16GB DDR5-4800 RDIMM |
|---|---|---|---|---|
| Package | 288-pin DDR5 RDIMM | 288-pin DDR5 RDIMM - same | 288-pin DDR5 RDIMM - same | 288-pin DDR5 RDIMM - same |
| Brand | SK hynix | SK hynix | SK hynix | A-Tech (third-party compatible) |
| Capacity | 16 GB | 16 GB | [DATA_NEEDED] | 16 GB |
| Data Rate | 4800 MT/s (PC5-38400) | 4800 MT/s (PC5-38400) | 4800 MT/s (PC5-38400) | 4800 MT/s (PC5-38400) |
| Organization | 1Rx8 | 1Rx8 | [DATA_NEEDED] | 1Rx8 |
| CAS Latency | CL40 | CL40 | [DATA_NEEDED] | CL40 |
| Operating Voltage | 1.1 V | 1.1 V | 1.1 V | 1.1 V |
| ECC / Registered | Yes / Yes (RDIMM) | Yes / Yes | Yes / Yes | Yes / Yes |
| Unit Price (qty 1, as of 2026-09-05) | $89.00 | [DATA_NEEDED] | [DATA_NEEDED] | $85.99 (marketplace equivalent listing) |
Key Differentiators
- 1Rx8 single-rank organization minimizes controller loading (vs HMCG78MEBSA092N)
- Genuine SK hynix OEM silicon with suffix-matched family replacement (vs A-Tech 16GB DDR5-4800 RDIMM)
- DDR5-4800 at 1.1V balances bandwidth and power (vs HMA84GR7CJR4N-XN)
Design Notes
Never mix RDIMMs with UDIMMs or LRDIMMs in one platform - DDR5 keying prevents it physically, and mixing rank counts or vendors across channels commonly forces all channels down to a lower common speed (e.g., 4400 MT/s). Check the server OEM qualified vendor list (QVL) for the exact suffix (168N vs 115N) before large deployments; OEM validation is per-suffix, not per-family. Population order matters: fill white/black channel slots per the OEM interleaving map to preserve 4-channel or 8-channel interleaving.
DDR5 RDIMMs include an on-module PMIC and support optional hardware thermal sensors; populated server chassis typically maintain DIMM inlet air at or below the JEDEC-recommended operating range. In dense 1U configurations, verify module spacing and heat-spreader contact - single-rank 1Rx8 modules like this one dissipate less than dual-rank parts, easing marginal airflow zones. Enable the platform's memory thermal throttling policy so the BMC can derate speed on over-temperature events instead of hard-failing.
DDR5 modules are more ESD-sensitive than DDR4 because the PMIC sits on the module itself. Always handle by the edges with a grounded wrist strap, store in shielded antistatic bags, and never touch the gold edge fingers. After installation, verify in BIOS that each module trained at 4800 MT/s - a module reporting a lower trained speed usually indicates a population-rule issue, not a defective module.
Compliance Information
JEDEC-compliant DDR5 RDIMM per distributor listings (CoreWave Labs); formal RoHS/REACH declarations not found in provided data.
