Product Overview
National Semiconductor A3595-304 TO-99 Hermetic Metal Can IC - Early NS Logo, Unclipped Gold Leads
Condition
Unused NOS. Evaluation: Visual inspection only. Function testing not performed. Stamped markings A3595 304 confirmed on lid; early National Semiconductor monogram logo present, consistent with late 1960s to mid-1970s manufacture. Eight unclipped gold-plated leads, no visible bends, corrosion, or oxidation. Sourced from legacy electronics supply chain recovery.
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Product Overview
National Semiconductor A3595-304, housed in an 8-pin TO-99 hermetically sealed metal can with gold-plated through-hole leads. The early NS monogram logo stamped on the cap places manufacture in the foundational years of the company - before the widely recognized Wavy NS oval became standard - anchoring this IC to the pioneering era of monolithic integrated circuit production. No public datasheet exists for this part number; its exact electrical function is not confirmed. The hermetic metal can package and gold lead finish are consistent with high-reliability or military/aerospace contract manufacturing practices of the period.
Key Features
- Package: 8-pin TO-99 circular metal can, hermetically sealed
- Lead finish: Gold-plated, unclipped, suitable for through-hole mounting
- Markings: A3595 304 stamped on lid, confirmed
- Logo: Early National Semiconductor monogram variant - pre-Wavy NS era
- Condition: Uninstalled, leads intact with no bends or corrosion
- Exact electrical function: Not confirmed - no public datasheet available
- Pinout: Not confirmed
Applications
- Vintage electronics collector adds this to a curated display of hermetic metal can ICs from the first decade of Silicon Valley commercial production
- Curve tracer enthusiast profiles an unknown IC to characterize its I-V behavior and attempt to deduce function - this part's unmarked provenance makes it a compelling specimen
- Defense electronics restoration tech sourcing original hermetic-sealed components for legacy military or aerospace equipment where the original part called for a high-reliability National Semiconductor IC
- Legacy instrumentation repair shop stocking potential drop-in candidates for older precision equipment that used TO-99 package ICs from this period
- Electronics historian documenting the transition from early NS branding to the later Wavy NS era - this logo variant is a tangible timestamp
- Maker or hobbyist building a retro-aesthetic circuit or display board where genuine period hardware is part of the design brief
Frequently Asked Questions
What does the A3595-304 actually do?
The exact electrical function is not confirmed. No public datasheet exists for this part number. The TO-99 hermetic metal can package and gold leads are consistent with high-reliability operational amplifiers, voltage regulators, or custom contract ICs manufactured for military or aerospace applications during this era. Buyers should have a curve tracer or equivalent diagnostic equipment available if they need to characterize the part before use.
Does this fit a standard TO-99 or TO-5 socket?
Yes. The 8-pin circular lead geometry is compatible with standard TO-99 and TO-5 footprint sockets. Leads are unclipped and in original condition.
Is a datasheet available?
No public datasheet for the A3595-304 has been located. This part number does not appear in standard cross-reference databases. It is consistent with a low-volume proprietary or contract-manufactured component from National Semiconductor's early production years.
What does the "304" designation indicate?
The full stamped marking A3595 304 is confirmed on the lid. The meaning of the 304 designation within National Semiconductor's internal numbering for this specific part is not confirmed.
Is this the same as an LM304?
No. The LM304 is a 10-lead TO-100 package part. This A3595-304 is an 8-lead TO-99. They are different parts with different pinouts and lead counts.
Cold War silicon in a hermetic shell, leads still sharp and gold after fifty-odd years - whoever needs this one will know it when they see it.
