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NM27C256N-120 — DIP-24/28/40 package (representative)
DIP-24/28/40
Representative of package type
National Semiconductor Corp

NM27C256N-120

EPROM · DIP-28 · Memory
Part Status: Obsolete In demand
Data last refreshed Jul 28, 2026
Manufacturer
National Semiconductor Corp
Mfr Part #
NM27C256N-120
Series
NM27C256
Category
EPROM
Datasheet
View datasheet ↗
Availability & Pricing
Unit PriceRequest a Quote
Sourcing channels8
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Product Attributes

Electrical & Parametric
Access Time120 ns
Organization32K x 8
Supply Voltage5 V
Physical & Thermal
Package / CaseDIP-28
Mounting TypeThrough Hole
SeriesNM27C256
Operating Temperature0°C ~ 70°C
Classification & Lifecycle
CategoryEPROM
TypeMemory
Part StatusObsolete

256 Kb (32K x 8) CMOS UV EPROM, 120 ns access time

Availability & Sourcing

8 sources
SourceMfrQtyDate CodeConditionStatus
Market NSC 1183 9524 — Available RFQ
Market NSC 131 9430 — Available RFQ
Market ONSEMI 130 — — Available RFQ
Market NATIONAL 117 9606 — Available RFQ
Market FAI 100 9852 — Available RFQ
Market NATIONAL SEMICO 47 9524 — Available RFQ
Market NSC 3 94 — Available RFQ
Market NSC 1 — — Available RFQ

ZDI Stock — in our warehouse · Market — offers available through our sourcing network · Live — recent offers from our sourcing network.

Part Activity

recent searches, RFQs & offers
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NM27C256N-120 viewed on the web · Web User
NM27C256N-120 viewed on the web · Web User
NM27C256N-120 viewed on the web · Web User
NM27C256N-120 viewed on the web · Web User
NM27C256N-120 viewed on the web · Web User
NM27C256N-120 searched via the web · Web User

Recent search and sourcing activity for NM27C256N-120.

Engineering FAQ

NM27C256N-120 is marked Obsolete — how does ZDI assure authenticity?
Obsolete and end-of-life parts carry elevated counterfeit risk, which is exactly why ZDI routes every lot through the full EQuality Process™ — validation, QI-1 and QI-2/camera inspection, RoHS verification, bake and bag-and-tag, and QI-3 final inspection — with source-country supplier vetting and full lot traceability before release.
What are the key specifications of NM27C256N-120?
Access Time: 120 ns; Organization: 32K x 8; Supply Voltage: 5 V.
What package is NM27C256N-120 supplied in?
NM27C256N-120 is supplied in the DIP-28 package, through hole, rated 0°C ~ 70°C.
Can ZDI source NM27C256N-120 beyond the quantities shown?
Yes — ZD Integrated Circuits specializes in sourcing hard-to-find, obsolete, and excess electronic components through its global network, with counterfeit-avoidance inspection on every lot. Submit an RFQ with your target quantity for availability and pricing.

Documents & Media

Quality & Counterfeit Avoidance

ISO 9001 ERAI Member ESD Certified GIDEP Participant ZDI EQuality Process CAGE Code 1V8K2

ZD Integrated Circuits operates an ISO 9001-certified quality system incorporating JEDEC-standard process-control elements. In an era of global sourcing and internet procurement, standards compliance alone no longer assures component authenticity — so ZDI pioneered a multi-layered counterfeit-avoidance program: supplier analysis at the source-country level, detailed component analysis, defined inspection standards for all incoming devices, and stringent supplier rating and review. These programs let ZDI guarantee the integrity and the source of every component it ships.

Every lot moves through ZDI's EQuality Process™ — validation, QI-1 and QI-2/camera inspection, RoHS verification, bake and bag-and-tag, and QI-3 final inspection — with Quality-Manager disposition before release. Nonconforming material is quarantined; conforming material is warehoused or shipped.

✓Multi-stage EQuality Process™ inspection (QI-1 · QI-2/camera · QI-3)
✓Source-country supplier analysis, rating & review
✓Incoming inspection, RoHS verification, bake, full lot traceability
✓ESD-controlled handling · authentic parts guaranteed

NM27C256N-120 is marked Obsolete. Obsolete and end-of-life parts carry elevated counterfeit risk — exactly why ZDI routes them through the full EQuality Process™ with source-country supplier vetting, inspection, and traceability.

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