MT61K512M32KPA-21:U TR

For production purchasing, the complete MT61K512M32KPA-21:U TR ordering description should be preserved. A shortened BOM entry can remove information that matters to memory performance or packaging.

Does TR Change the Electrical Specification?

The TR designation is associated with Tape & Reel packaging. It does not create a second 21GT/s memory architecture. The key electrical identity remains MT61K512M32KPA-21:U.

This distinction matters when purchasing replacement material. A supplier may quote the base device without displaying TR in the same way, but the procurement team still needs to confirm the packaging format, manufacturer ordering code, lot traceability and assembly requirements.

The following values are the key parameters shown in Micron's current GDDR6X part catalog. Engineering teams should still use the applicable Micron datasheet for complete AC/DC limits, timing, initialization and package details.

A 16Gb device contains 2GB of raw capacity because eight bits equal one byte. This allows system designers to scale total graphics-memory capacity by changing the number of populated memory packages.

The x32 interface also enables a useful theoretical bandwidth calculation. At 21GT/s across 32 data bits, one device can provide approximately 84GB/s of theoretical raw interface bandwidth.

Bandwidth Formula

21 billion transfers per second × 32 bits ÷ 8 bits per byte gives approximately 84 billion bytes per second.

This is a theoretical interface figure, not a guaranteed application benchmark. Protocol overhead, memory-controller behavior, workload efficiency, timing, thermals and system architecture all affect real sustained bandwidth.

At GDDR6X data rates, the PCB should be considered part of the memory interface rather than a passive connection between the GPU and DRAM. Trace geometry, layer transitions, return paths, vias and package breakout all influence system margin.

MT61K512M32KPA-21:U uses a 180-ball TFBGA package with nominal dimensions of 12.00 × 14.00 × 1.20mm. The package combines high I/O density with the short electrical paths needed for a very high-speed memory interface.

MT61K512M32KPA-21:U is primarily relevant to designs that already support Micron-style GDDR6X memory and need a 16Gb, x32 device in the 21GT/s performance class.

Strong Fit Conditions

Conditions Requiring Another Memory Strategy

• ✓ The memory controller supports only conventional GDDR6 signaling.
• ✓ The system requires an operating-temperature range outside the approved device specification.
• ✓ A completely new long-lifecycle product cannot accept obsolete-component sourcing risk.
• ✓ The target GPU or ASIC reference design specifies a different density, pinout or memory generation.

Graphics memory should not be substituted using density and package size alone. A candidate replacement must be evaluated against memory technology, signaling type, organization, pinout, speed grade, controller support and firmware configuration.

MT61K512M32KPA-24:U

Micron's current GDDR6X catalog also lists MT61K512M32KPA-24:U, a 16Gb x32 GDDR6X configuration rated at 24GT/s. It belongs to a closely related family, but the higher speed grade does not by itself make it an automatically approved substitute.

BIOS, memory-controller settings, package revision, board-level SI, timing and production qualification still need review. Micron currently also marks the -24:U device obsolete, so it does not eliminate lifecycle risk.

Incoming inspection for obsolete high-speed graphics memory should combine physical, documentation and electrical evidence. Package appearance alone is not enough to establish device authenticity or production suitability.

Production Qualification Flow