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STMicroelectronics (SGS-Thomson)

M27C256B-12C1

EPROM · PLCC-32 · Memory
Part Status: Obsolete In demand
Data last refreshed Jul 31, 2026
Manufacturer
STMicroelectronics (SGS-Thomson)
Mfr Part #
M27C256B-12C1
Series
M27C256B
Category
EPROM
Datasheet
View datasheet ↗
Availability & Pricing
Unit PriceRequest a Quote
Sourcing channels13
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Product Attributes

Electrical & Parametric
Memory Size256 Kb
Organization32K x 8
Access Time120 ns
Voltage5 V
Physical & Thermal
Package / CasePLCC-32
Mounting TypeSurface Mount
SeriesM27C256B
Classification & Lifecycle
CategoryEPROM
TypeMemory
Part StatusObsolete

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

Environmental & Export Classifications

RoHS Status
Non-Compliant

Availability & Sourcing

13 sources
SourceMfrQtyDate CodeConditionStatus
Market ST MICRO 1600 — — Available RFQ
Market ST MICRO 960 — — Available RFQ
Market Hynix 436 — — Available RFQ
Market STM 434 — — Available RFQ
Market STMicroelectron 365 — — Available RFQ
Market ST MICRO 352 — — Available RFQ
Market ST Microelectro 297 0118 — Available RFQ
Market SGS 250 01+ — Available RFQ
Market SGS 235 9548 — Available RFQ
Market ST MICRO 150 05+ — Available RFQ
Market ST MICRO 133 0108 — Available RFQ
Market STM 110 — — Available RFQ
Market STMICROELECTRON 88 110 — 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
M27C256B-12C1 viewed on the web · Web User
M27C256B-12C1 viewed on the web · Web User
M27C256B-12C1 viewed on the web · Web User
M27C256B-12C1 viewed on the web · Web User
M27C256B-12C1 viewed on the web · Web User
M27C256B-12C1 viewed on the web · Web User
M27C256B-12C1 viewed on the web · Web User
M27C256B-12C1 viewed on the web · Web User

Recent search and sourcing activity for M27C256B-12C1.

Engineering FAQ

M27C256B-12C1 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 M27C256B-12C1?
Memory Size: 256 Kb; Organization: 32K x 8; Access Time: 120 ns; Voltage: 5 V.
What package is M27C256B-12C1 supplied in?
M27C256B-12C1 is supplied in the PLCC-32 package, surface mount.
Can ZDI source M27C256B-12C1 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

M27C256B-12C1 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.

Need M27C256B-12C1?

ZD Integrated Circuits sources hard-to-find, obsolete, and excess components worldwide — pricing and availability, fast.

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