Component Watch: What's Moving This Week

When HBM is sold out through 2026, commodity DRAM is no longer a market — it's a residual.

The memory market has decoupled from its own history. DDR5 contract pricing rose 95% in Q1 2026, and the consensus forecast for Q2 is another 58–63%. This is not a cyclical correction overshoot; it is a structural displacement.

The mechanism is wafer fungibility. The leading Korean memory producers manufacture HBM and commodity DDR5 on overlapping 1b-nm (≈12 nm-class) DRAM process nodes. An HBM4 stack is a 12-Hi or 16-Hi assembly of core dies plus a logic base die, hybrid-bonded at sub-10 µm pitch. Because HBM consumes roughly 3× the wafer area per functional gigabit of standard DDR5 — die area lost to TSV keep-out, ECC overhead, and the redistribution layers for 2,048-bit interfaces — every wafer diverted to HBM removes a disproportionate share of bit supply from the commodity pool. With HBM4 sold out through the end of 2026 at the top Korean suppliers, commodity DDR5 is now whatever capacity is left after the AI allocation clears.

Leading Foundry — Snapdragon on 3 nm GAA. A leading Korean foundry secured a Snapdragon flagship tile on its 3 nm node — a gate-all-around (GAA) Multi-Bridge-Channel FET process. For EMC engineers, the GAA transition matters: nanosheet stacks deliver steeper subthreshold slope and faster edge rates, which pushes broadband emission energy higher into the 5–15 GHz decade.

Automotive EMC: The Geometry Mistake

We audited 14 recent automotive shielding failures. Eight of them traced to a single root cause: a reused shield-can footprint mapped onto a re-spun PCB without recalculating the aperture geometry.

Here is the physics. A shield enclosure with a slot or aperture behaves as a slot antenna. Shielding effectiveness through an aperture of maximum linear dimension L degrades as the operating wavelength λ approaches 2L. The widely-used engineering rule:

SE(dB) ≈ 20·log₁₀(λ / 2L)

This holds while L < λ/2. The practical design ceiling is L ≤ λ/20 — at that ratio you retain roughly 20 dB of aperture-limited SE. Cross λ/2 and SE collapses to zero: the slot is now a resonant radiator.

Concretely: a 30 mm vent slot resonates near 5 GHz (λ/2 = 30 mm). When a layout revision moves a connector and the can vent now sits over an active 5 GHz clock harmonic, measured attenuation falls from a designed 40 dB to ~25 dB — and CISPR 25 Class 5 radiated-emission limits in the 1–6 GHz band leave you with no margin.

⚠️Layout-review checkpoint

Any time component placement shifts under an existing shield footprint, re-derive every aperture against the highest clock harmonic of concern. If L cannot be reduced below λ/20, convert the opening to a waveguide-below-cutoff (WBC) vent — a deep, narrow channel attenuates at ≈ 30·(d/L) dB per unit depth below the cutoff frequency f_c = 1.841·c / (π·d) for a circular guide of diameter d.

Price Watch

Silver at $75.67/oz is the quiet story. Silver-filled conductive elastomer gaskets are now a material line-item, not a rounding error — another reason beryllium-copper and stainless spring-finger contacts are gaining share in cost-sensitive shield designs.

One Thing

In 2017, the last great DRAM run-up was smartphone-driven: a demand curve with seasonal shape, holiday peaks, and a Q1 trough that always corrected pricing.

The 2026 curve is AI-driven, and AI training clusters do not have a holiday season. Demand is monotonic, the curve is steeper, and there is no built-in correction. Plan capacity and contracts as if the trough is gone — because for this cycle, it is.

POCONS USA — EMI shields, shield clips, spring contacts, custom stampings. Products manufactured in Korea (IATF 16949). US Operations: San Diego. — Mike Kwak, POCONS USA