Siliconix Hermetic
In 2017, ES Components strategically expanded its semiconductor capabilities by acquiring Siliconix’s complete inventory of Military JFETs, MOSFETs, and analog switches—along with all associated finished goods, assembly, and test equipment. This acquisition significantly strengthened ES Components’ position in the high-reliability market, enabling deeper support for both legacy and next-generation designs. In addition to fully qualified military products, ES Components gained access to millions of Siliconix Hi-Rel finished goods and wafers—ideal for non-MIL-PRF-19500 and MIL-PRF-38535 assemblies—delivering unmatched flexibility, performance, and supply assurance to engineers tackling the most demanding applications.
When “Obsolete” Doesn’t Mean Gone — But Still Stops Your Program
The Reality Engineers Are Facing Today
A $25 part can trigger a $300K redesign.
An “obsolete” device can delay a program by 8+ weeks.
And in many cases…
The part still exists.
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Across aerospace, defense, medical, and industrial programs, we’re seeing a consistent pattern:
> Components labeled “obsolete” are often still available
> But not through traditional channels
> And not when teams wait too long to look
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What This Means for Your Program
When availability is evaluated too late:
• redesign becomes the default
• schedules slip
• costs increase
• risk grows
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But in many cases, that outcome can be avoided.
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What We’re Seeing with Siliconix Hermetic Devices
Many legacy Siliconix hermetic components continue to be available through:
• original die
• existing inventory
• qualified manufacturing flows
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Meaning:
> “Obsolete” doesn’t always mean unavailable
> It means you may need a different sourcing approach
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How ES Components Supports This
We help engineers and buyers:
• determine true availability
• avoid unnecessary redesign
• maintain continuity in proven designs
• source legacy Siliconix hermetic devices
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Because sometimes the best solution…
isn’t changing the design.
It’s finding what still exists.
Real-World Impact
$25 part → avoided $300K redesign
“Obsolete” device → prevented 8-week delay
Legacy component → sourced without redesign
ES Components Your Source For Siliconix
Commercial & Hermetic Military Products
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In 2017 ES Components purchased all Military JFET/MOSFET and Analog Switch Inventories, Finished Goods, Assembly and Test Equipment from SILICONIX.
ES Components subcontracted our JAN JFET and MOSFETS (MIL 19500) Production and Test to VPT Components. Per the DLA the assemblies must be marked with the VPT brand not Siliconix or ES Components but, the internal Qualified SILICONIX Silicon chips made in Santa Clara and outperform the competition as they always have.
The Analog Switch and other Military components previously offered by SILICONIX are now Assembled and Qualified by ES Components to (Mil 38535) and carry the ES Components Brand not Siliconix and like the JAN JFETS have SILICONIX Qualified Siliconix chips Inside. The same Siliconix Military products with a different brand.
In addition to Military Qualified products, ES Components received millions of SILICONIX Hi Reliability finished goods and wafers of both JFETS/MOSFETS and Analog Switches, for non Mil 19500 and Mil 38535 assemblies to be tested and marked with the ES Components Brand not the Siliconix. Like the Military products all Die are SILICONIX manufactured and meet the same performance and quality standards.
SILICONIX also offered Specials, Custom, Non-Standard Military grade and Hi Reliability assemblies. ES Components has the ability to supply those same assemblies using SILICONIX Die, screened to all requirements or any other custom configuration a customer may need.
In conclusion SILICONIX Military and Industrial equivalents are still alive and available from ES Components. Bring us your requirements, we have seamless solutions.
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o MOSFETS
o JFETS
o CURRENT REGULATORS
o LOW LEAKAGE DIODES
o HERMETIC ANALOG SWITCHES
o VOLTAGE CONTROLLED REGULATORS
o CUSTOMER SPECIFIC
o COTS Commercial Off-The-Shelf
o OTS Hermetic Off-The-Shelf
o MOTS Military Off-The-Shelf (MIL-PRF-19500 and MIL-PRF-38535)
o SOTS Up Screened -2 -3 Off-The-Shelf (MIL-PRF-19500 and MIL-PRF-38535)
Literature