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QD27C256-20 — DIP-24/28/40 package (representative)
DIP-24/28/40
Representative of package type
Intel Corp

QD27C256-20

EPROM · DIP-28 Ceramic · Memory
Part Status: Obsolete In demand
Data last refreshed Jul 31, 2026
Manufacturer
Intel Corp
Mfr Part #
QD27C256-20
Series
27C256
Category
EPROM
Datasheet
View datasheet ↗
Availability & Pricing
Unit PriceRequest a Quote
Sourcing channels9
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Product Attributes

Electrical & Parametric
Organization32K x 8
Access Time200 ns
TechnologyCMOS
Memory Size256 Kb
Physical & Thermal
Package / CaseDIP-28 Ceramic
Mounting TypeThrough Hole
Series27C256
Classification & Lifecycle
CategoryEPROM
TypeMemory
Part StatusObsolete

256 Kb (32K x 8) CMOS UV EPROM, 200 ns, 28-pin ceramic DIP

Environmental & Export Classifications

RoHS Status
Non-Compliant

Availability & Sourcing

9 sources
SourceMfrQtyDate CodeConditionStatus
Market — 26 — — Available RFQ
Market INTEL 11 90+ — Available RFQ
Market INTEL 4 — — Available RFQ
Market INT 035 3 — — Available RFQ
Market INT 3 — — Available RFQ
Market INTEL 1000 97+ — Available RFQ
Market INTEL 650 06+ — Available RFQ
Market INTEL 382 97+ — Available RFQ
Market Intel 3 — — 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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QD27C256-20 viewed on the web · Web User
QD27C256-20 viewed on the web · Web User
QD27C256-20 viewed on the web · Web User
QD27C256-20 viewed on the web · Web User
QD27C256-20 viewed on the web · Web User
QD27C256-20 viewed on the web · Web User
QD27C256-20 viewed on the web · Web User

Recent search and sourcing activity for QD27C256-20.

Engineering FAQ

QD27C256-20 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 QD27C256-20?
Organization: 32K x 8; Access Time: 200 ns; Technology: CMOS; Memory Size: 256 Kb.
What package is QD27C256-20 supplied in?
QD27C256-20 is supplied in the DIP-28 Ceramic package, through hole.
Can ZDI source QD27C256-20 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

QD27C256-20 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.

Related Parts

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