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M27C256B-12F1 — DIP-24/28/40 package (representative)
DIP-24/28/40
Representative of package type
STMicroelectronics

M27C256B-12F1

EPROM · DIP-28 Ceramic · Memory
In stock at ZDI Part Status: Obsolete
Data last refreshed Jun 19, 2026
Manufacturer
STMicroelectronics
Mfr Part #
M27C256B-12F1
Series
M27C256B
Category
EPROM
Datasheet
View datasheet ↗
Availability & Pricing
ZDI Stock1027 pcs
Date Codesmixed, 9948, 9125+
PackagingTubed
Temp GradeCommercial
Unit PriceRequest a Quote
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Live pricing on request · most quotes same business day

Product Attributes

Electrical & Parametric
Memory Size256 Kb
Organization32K x 8
Access Time120 ns
Voltage5 V
Physical & Thermal
Package / CaseDIP-28 Ceramic
Mounting TypeThrough Hole
SeriesM27C256B
Classification & Lifecycle
CategoryEPROM
TypeMemory
Part StatusObsolete

256 Kbit (32K x 8) CMOS UV EPROM, 120 ns, 5 V

Environmental & Export Classifications

RoHS Status
Non-Compliant

Availability & Sourcing

1 source row · masked
SourceMfrQtyDate CodeConditionStatus
ZDI Stock STMicroelectronics 1027 mixed, 9948, 9125+ SKT PULLS In Stock RFQ

ZDI Stock — held in our warehouse · Market — recent offers, sourced on request · Live — fresh from the broker network. Supplier identity and cost are never shown.

Part Activity

recent searches, RFQs & offers
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M27C256B-12F1 searched via the web · Web User
M27C256B-12F1 searched via the web · Web User
M27C256B-12F1 searched via the web · Web User
M27C256B-12F1 searched via the web · Web User
M27C256B-12F1 searched via the web · Web User

Live search & sourcing activity for M27C256B-12F1 — real inquiries only.

Engineering FAQ

answers from this part's real data
M27C256B-12F1 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 quantity and packaging is M27C256B-12F1 in ZDI stock?
ZDI holds 1,027 pcs, packaged as Tubed, date code(s) mixed, 9948, 9125+. Request a quote for confirmed quantity, lead time, and pricing.
What are the key specifications of M27C256B-12F1?
Memory Size: 256 Kb; Organization: 32K x 8; Access Time: 120 ns; Voltage: 5 V.
What package is M27C256B-12F1 supplied in?
M27C256B-12F1 is supplied in the DIP-28 Ceramic package, through hole.
Can ZDI source M27C256B-12F1 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

⚠ Industry counterfeit reports on file for M27C256B-12F1

ERAI/GIDEP · reported 4/21/2011 11:57:23 AM · ST MICROELECTRONICS · report ↗

Every lot ZDI ships is routed through the full EQuality Process™ — validation, camera inspection, and full lot traceability.

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

M27C256B-12F1 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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