Product Introduction
Industrial MHz Crystal Family — Product Collection (FCX, FSX, HC-49)
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  • Industrial MHz Crystal Family — Product Collection (FCX, FSX, HC-49)

Industrial MHz Crystal Family — Product Collection (FCX, FSX, HC-49)

Industrial MHz Crystal

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High-Precision Timing Devices

FEATURE

A curated product collection for industrial & embedded MHz crystals: compact SMD FCX series, legacy FSX options, and HC-49 metal-can footprints.
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Product Description

Quick filter FCX SMD & DIP FSX legacy HC-49 footprints Upgrade paths Selection & RFQ checklist

What this collection is for (selection snapshot)

Industrial control hardware (PLCs, gateways, sensors, drives, embedded compute modules) typically needs a stable MHz reference for MCU/SoC timing, communication clocks, and subsystem synchronization. On this page you can quickly match footprint (e.g., 1.2×1.0mm, 2.0×1.6mm, 3.2×2.5mm, 5.0×3.2mm, 7.0×5.0mm), then narrow by frequency, load capacitance (CL), tolerance / stability, temperature range, and ESR limits required by your oscillator. If you’re migrating a locked legacy PCB, jump to FSX or HC-49 footprints and use the upgrade guidance to move toward FCX where feasible.

Quick filter

Filter product cards by family group.

FCX series (recommended for new designs)

Modern MHz crystal options across compact SMD footprints and DIP form factors. Pick footprint first, then confirm CL/ESR and temperature grade.

FCX • SMD 1.6×1.2mm

FCX-1M — 1.6×1.2mm SMD MHz Crystal

Best for: compact industrial modules and dense layouts
Selection: verify CL target + ESR limits per oscillator/MCU
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FCX • SMD 1.2×1.0mm

FCX-1S — 1.2×1.0mm SMD MHz Crystal

Best for: ultra-mini embedded nodes
Selection: validate start-up margin on final PCB
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FCX • SMD 2.5×2.0mm

FCX-2M — 2.5×2.0mm SMD MHz Crystal

Best for: gateways, networking, industrial comms
Selection: balance footprint vs. design margin
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FCX • SMD 2.0×1.6mm

FCX-2S — 2.0×1.6mm SMD MHz Crystal

Best for: compact comms modules
Selection: confirm CL and oscillator drive level
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FCX • SMD 3.2×2.5mm • (G)

FCX-3G — 3.2×2.5mm SMD MHz Crystal (G)

Best for: industrial boards needing a robust 3225 footprint
Selection: use when BOM/qualification calls for this variant
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FCX • SMD 3.2×2.5mm

FCX-3M — 3.2×2.5mm SMD MHz Crystal

Best for: mainstream industrial MCU/SoC clocks
Selection: strong default footprint for new designs
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FCX • SMD 5.0×3.2mm • (G)

FCX-5G — 5.0×3.2mm SMD MHz Crystal (G)

Best for: designs qualifying a specific 5032 variant
Selection: confirm variant requirements in your spec
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FCX • SMD 5.0×3.2mm

FCX-5M — 5.0×3.2mm SMD MHz Crystal

Best for: wider margin designs, stable reference clocks
Selection: good choice when 3225 is too tight
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FCX • SMD 7.0×5.0mm

FCX-7M — 7.0×5.0mm SMD MHz Crystal

Best for: larger footprint industrial designs
Selection: use when board area is available
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FCX • HC-49 SMD

FCX-9M — HC-49 SMD MHz Crystal

Best for: legacy-compatible assemblies in SMD form
Selection: check mechanical and soldering constraints
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FCX • DIP • UM-4

FCX-4U — UM-4 (DIP) MHz Crystal

Best for: through-hole platforms and fixtures
Selection: confirm frequency coverage + tolerance
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FCX • DIP • UM-5

FCX-5U — UM-5 (DIP) MHz Crystal

Best for: through-hole legacy boards
Selection: validate mechanical constraints
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FCX • DIP • UM-1

FCX-M1 — UM-1 (DIP) MHz Crystal

Best for: legacy comms equipment and prototypes
Selection: provide oscillator/MCU model in RFQ if possible
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FCX • DIP • UM-5

FCX-M5 — UM-5 (DIP) MHz Crystal

Best for: broad legacy support with DIP footprint
Selection: verify frequency and temperature grade
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FSX series (legacy support)

Use for maintenance builds where footprint is locked. For new boards, migrate to FCX where feasible.

FSX • Legacy • 2.5×2.0mm

FSX-2M — Legacy 2.5×2.0mm SMD MHz Crystal

Upgrade suggestion: consider FCX-2M for new designs
View legacy Go to FCX-2M
FSX • Legacy • 2.0×1.6mm

FSX-2MS — Legacy 2.0×1.6mm SMD MHz Crystal

Upgrade suggestion: consider FCX-2S for new designs
View legacy Go to FCX-2S
FSX • Legacy • 3.2×2.5mm

FSX-3M — Legacy 3.2×2.5mm SMD MHz Crystal

Upgrade suggestion: consider FCX-3M or FCX-3G
View legacy Go to FCX-3M
FSX • Legacy • 5.0×3.2mm (L)

FSX-5L — Legacy 5.0×3.2mm MHz Crystal (L)

Upgrade suggestion: consult FCX-5M / FCX-5G options
View legacy Ask about upgrade
FSX • Legacy • 5.0×3.2mm

FSX-5M — Legacy 5.0×3.2mm SMD MHz Crystal

Upgrade suggestion: consider FCX-5M or FCX-5G
View legacy Go to FCX-5M

HC-49 footprints (legacy and transition designs)

Metal-can footprints used in long-life boards. Use these when the mechanical footprint is locked or for specific qualification requirements.

HC-49S • Through-hole

HC-49S — Through-hole MHz Crystal

Best for: traditional through-hole industrial platforms
New designs: consider FCX SMD footprints where possible
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HC-49US • Through-hole

HC-49US — Through-hole MHz Crystal (Legacy)

Best for: maintenance builds with locked HC-49US footprint
Migration: consider FCX-9M for SMD transition (when applicable)
View product Go to FCX-9M
HCM49S • SMD metal-can

HCM49S — HC-49US Style SMD MHz Crystal (Legacy)

Best for: legacy boards requiring HC-49US-style SMD footprint
New designs: review FCX SMD options first
View product Ask about alternatives

Upgrade paths (legacy → recommended FCX)

Use this as a starting point when migrating legacy footprints. Always confirm mechanical compatibility and electrical requirements (CL/ESR/drive level).

Legacy family / footprint Recommended target When to migrate Notes
FSX-2M
2.5×2.0mm SMD		 FCX-2M New boards / re-layout allowed Keep frequency + CL consistent; validate start-up margin after layout.
FSX-2MS
2.0×1.6mm SMD		 FCX-2S Space-constrained redesigns More sensitive to layout parasitics; confirm ESR limits for your MCU oscillator.
FSX-3M
3.2×2.5mm SMD		 FCX-3M / FCX-3G Mainstream redesigns Use 3225 as a strong default footprint for industrial timing references.
FSX-5M / FSX-5L
5.0×3.2mm SMD		 FCX-5M / FCX-5G When you want more margin than 3225 Helpful when oscillator negative resistance margin is tight or for certain compliance requirements.
HC-49US
Through-hole legacy		 FCX-9M (HC-49 SMD) Transition to SMD assembly Confirm mechanical fit and assembly constraints; consider moving further to 3225/5032 if re-layout is possible.
UM-1 / UM-5 DIP
DIP legacy		 FCX-M1 / FCX-M5 / FCX-4U / FCX-5U Locked through-hole platforms Provide oscillator/MCU details in RFQ to speed matching (ESR/drive level constraints).

Selection & RFQ checklist

Include these details to get a faster match and reduce qualification churn.

What to specify (practical checklist)
  • Frequency (MHz) and allowable frequency offset at your operating conditions.
  • Footprint / package (e.g., 1.2×1.0mm, 2.0×1.6mm, 3.2×2.5mm, 5.0×3.2mm, 7.0×5.0mm, HC-49, UM DIP).
  • Load capacitance (CL) target from the oscillator/MCU datasheet, plus any measured effective load on PCB.
  • ESR limits or the oscillator/MCU part number so we can align ESR grade and start-up margin.
  • Operating temperature range (industrial profiles may require wide temperature operation).
  • Tolerance / stability requirements, and any special aging, shock, or screening needs.
  • Drive level limit (if specified) and application details (industrial control, comms, sensors, etc.).
 
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