Automotive LPDDR4 at 125°C
The MT53E128M32D2DS-053 AUT:A is a 4Gbit Mobile LPDDR4 SDRAM from Micron's Automotive AEC-Q100 series, organized 128M x 32 and clocked at 1.866 GHz. The headline here is the 125°C case temperature rating — that's the full automotive Grade 1 envelope, covering under-hood and engine-adjacent ECUs that see sustained heat soak. The 1.1V core supply keeps the I/O power budget tight, and the 200-WFBGA (10x14.5 mm) footprint is the standard LPDDR4 ballout for this density.
Temperature grade and what it buys you
The 125°C ceiling is the key differentiator from the -40°C to 95°C (AIT:A) and -40°C to 105°C (AAT:A) siblings in the same MT53E128 family. If your design's ambient under the heatsink or potting hits 110°C, the AUT grade is the one that keeps the DRAM within spec.
1.866 GHz clock — what it means for throughput
The 1.866 GHz clock rate is the LPDDR4 I/O toggle speed — not the core array access. At 1.866 GHz with a 32-bit bus, the peak bandwidth is roughly 14.9 GB/s. That's enough to feed a high-resolution ADAS camera pipeline or a mid-range infotainment SoC without the memory interface becoming the bottleneck. The 1.1V VDDQ keeps signal swing low, which helps with EMI in the tight enclosure of an automotive ECU.
The package is RoHS3 compliant, and the tray packaging means the parts are delivered in matrix trays, not tape-and-reel. For rework, the standard LPDDR4 profile applies: peak reflow 260°C, ramp rate ≤3°C/s, and a moisture sensitivity level (MSL) that should be confirmed from the lot date code — LPDDR4 BGAs typically ship at MSL 3, so bake before reflow if the floor life has been exceeded.
Marked as Active — Micron is still producing this order code. The closest parametric sibling is the MT53E128M32D2DS-046 AUT:A, which bumps the clock to 2.133 GHz but keeps the same 125°C temp grade and package — a drop-in speed upgrade if the controller supports it.