Every clock tree in a car traces back to a piece of quartz, and in the automotive tier that quartz has to survive what consumer crystals never see: −40 °C cold cranks, +105 °C engine-bay adjacency, vibration on mounting posts, and an AEC-Q200 paper trail that procurement will actually audit. The D1SX25E000006A is a 25 MHz automotive crystal positioned for exactly that world — cockpit modules, T-BOX telematics, ADAS camera timing chains and body-domain boards.

The short answer

When a 25 MHz reference feeds an automotive SoC, a connectivity module or an ADAS sensor's timing chain, the D1SX25E000006A delivers the automotive-grade foundation: 25 MHz, AECQ-qualified build class, and the frequency tolerance profile that keeps PLLs locked across the full automotive temperature envelope.

Where 25 MHz shows up in a car

The 25 MHz reference is the de-facto root for:

  • Cockpit SoCs and display modules — USB, Ethernet and display-port PHYs deriving from a 25 MHz root
  • T-BOX and telematics — LTE/5G modules' standard reference frequency
  • ADAS cameras — SERDES link timing and sensor pixel-clock derivation
  • Body domains and BCM — CAN/Ethernet PHY references
  • OBC auxiliary boards and BMS — communication PHY timing

One frequency, many modules — which is why automotive buyers consolidate 25 MHz crystal volume across platforms, and why the part's supply stability matters as much as its datasheet.

What automotive-grade actually requires

Beyond the frequency, the automotive crystal checklist:

  • AEC-Q200 qualification class — the passive-component reliability standard automotive procurement audits
  • Wide temperature range — −40 to +125 °C operation for engine-bay and exterior-adjacent modules
  • Tight tolerance over life — frequency stability class matched to the PHY's PLL capture range, including ageing drift over 15 years
  • Vibration and shock resilience — SMD mounting with mechanical resonance well away from chassis modes
  • Traceability — date and lot coding that survives the customer's PPAP process

The D1SX25E000006A is positioned on this checklist as the car-grade alternative to consumer 25 MHz parts whose datasheets look similar until the environment column is read carefully.

Matching the crystal to the module

Selection is a pairing exercise between the crystal and the module's oscillator circuit:

  1. Load capacitance — the crystal's CL must match the board's capacitor network (including PCB parasitics); a mismatch is the classic root cause of frequency offset at factory test
  2. Drive level — the module's oscillator must stay within the crystal's rated drive; overdriving ages the quartz and drifts the frequency
  3. ESR budget — the oscillator's negative resistance must comfortably exceed the crystal's ESR across temperature, or cold-start reliability suffers — the failure mode that shows up as no-boot complaints from cold-climate fleets
  4. Frequency stability class — total allowable offset (initial + temperature + ageing) divided among the contributors; 25 MHz PHY references typically demand ±20 to ±50 ppm total

Send us the module's oscillator specification and we will check the pairing — this review costs a day and saves a frequency-offset field issue.

The T-BOX case in detail

The T-BOX is the harshest consumer of the 25 MHz reference: it sits at the edge of the cabin, sleeps and wakes with the vehicle, and its LTE module's frequency error directly affects network registration and emergency-call compliance. The crystal chain there needs:

  • Wide-temperature stability (cabin-edge mounting approaches the full automotive range)
  • Ageing budget accounting (the module may sit parked for weeks, then must register within seconds)
  • Start-up reliability at −40 °C — cold-climate eCall is a regulatory obligation, not a feature

This is the module where cutting corners on the crystal becomes visibly expensive.

Frequently asked questions

Is 25 MHz standard for LTE modules?

Yes — 25 MHz is one of the standard reference frequencies for cellular modules, alongside 26 MHz and others depending on the module vendor. The D1SX25E000006A targets the 25 MHz node of that ecosystem.

What temperature range does the automotive class cover?

The automotive tier targets −40 to +125 °C operation, with the exact stability class defined in the ordering code. Consumer-grade parts typically specify −20 to +70 °C — the gap is where automotive field failures live.

Can I use a consumer crystal with an AEC-qualified SoC?

Electrically it will oscillate. The qualification problem is the reverse direction — the crystal is now the unqualified element in your PPAP package, and automotive customers audit exactly that. The D1SX25E000006A exists so the weakest link is not the 25-cent component.

What documents ship with automotive deliveries?

Datasheet, qualification summary and lot traceability records — the PPAP-supporting document set. Tell us your customer's PPAP level and we will confirm the document coverage before you design the part in.

Sourcing note

The D1SX25E000006A ships through Mandu with automotive documentation support. Send your module type (cockpit, T-BOX, camera, BCM) and annual volume for the full specification, stability-class options and pricing.