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Home > Products > Integrated Circuits (ICs) > Memory > Memory

STMicroelectronics M27C4002-90C1

Name: M27C4002-90C1
Brand: STMicroelectronics
SKU: M27C4002-90C1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27C4002-90C1

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 44-LCC (J-Lead)

Datasheet:: M27C4002-90C1.pdf

Description:: IC EPROM 4MBIT PARALLEL 44PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M27C4002-90C1 from STMicroelectronics is a 4 Mbit (256K × 16) UV-erasable EPROM in PLCC44 package, featuring 45 ns access time, 5 V ±10% read supply, 12.75 V ±0.25 V programming voltage, and dual-line output control (E/G) for low-power memory arrays in legacy microprocessor systems.

For engineers reviewing the M27C4002-90C1 datasheet, M27C4002-90C1 pinout, M27C4002-90C1 application, or M27C4002-90C1 equivalent, key selection criteria include UV erasability, TTL-compatible address/data interface, standby current of 100 µA, PRESTO II programming algorithm support, and ECOPACK® lead-free compliance for industrial retrofits and repair programs.

Technical Context

The M27C4002-90C1 implements a two-control-line architecture: Chip Enable (E) governs power state and device selection, while Output Enable (G) independently gates data onto Q0–Q15 outputs - enabling zero-bus-contention memory expansion. Its logic diagram confirms full 18-bit address decoding (A0–A17) with no internal address multiplexing.

Programming requires precise voltage sequencing: VPP = 12.75 V ±0.25 V, VCC = 6.25 V ±0.25 V, and A9 = 11.5–12.5 V for Electronic Signature readout. Erasure relies on 2537 Å UV exposure (≥15 W·sec/cm²), with verified 15–20 minute cycle time at 12,000 µW/cm² intensity and ≤2.5 cm lamp distance.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	4 Mbit (262,144 × 16), organized as 256K words × 16 bits - supports 32-bit bus interfacing via byte-wide data latching.
Access Time	45 ns (tAVQV, tELQV) under high-speed AC conditions - enables direct interface with 10 MHz Z80/8086-class CPUs without wait states.
Read Supply	5 V ±10% - compatible with standard TTL/CMOS logic rails; no separate VDD/VCC decoupling complexity.
Standby Current	100 µA (CMOS E-high) - reduces system idle power by >99% vs active mode (70 mA @10 MHz), critical for battery-backed firmware storage.
Programming Voltage	VPP = 12.75 V ±0.25 V - requires dedicated HV generator; prevents accidental write during normal operation.
Electronic Signature	Manufacturer Code 20h, Device Code 44h - enables automated programmer identification and algorithm matching per JEDEC JESD-68.
UV Erase Dose	≥15 W·sec/cm² at 2537 Å - validated for full bit restoration after 10,000 program/erase cycles; windowed ceramic packages not applicable to PLCC44 variant.

Pinout & Package

PLCC44 (Plastic Leaded Chip Carrier, 44-pin, J-lead, 16.6 mm × 16.6 mm body) with ECOPACK® lead-free finish. Pin 1 marked by corner notch; leads arranged in square perimeter with 1.27 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
A0–A17	Address Inputs	18-bit parallel address bus; fully decoded - no address latch required; A9 used for Electronic Signature voltage injection.
Q0–Q15	Data Outputs	16-bit bidirectional data bus in programming mode; high-impedance when E or G inactive - eliminates external bus transceivers.
E	Chip Enable	Active-low primary selection signal; CMOS/TTL compatible; drives device into 100 µA standby when high.
G	Output Enable	Active-low secondary control; enables Q0–Q15 only when E is also low - enables multi-chip memory banking without contention.
VPP	Programming Supply	12.75 V input during programming/verify; internally isolated from VCC - prevents corruption of read-mode logic during write cycles.
VCC	Supply Voltage	5 V ±10% for read; 6.25 V ±0.25% for programming - dual-voltage operation mandates strict sequencing (VCC before VPP).
VSS	Ground	Dual VSS pins (pins 23 & 44) - reduce ground bounce in high-speed read bursts; require separate low-inductance PCB traces.
NC	No Connect	Pins 12, 22, 33, 34 - internally unconnected; must remain floating or tied to VSS per layout guidelines to avoid noise coupling.

Key Features

Feature	Design Value
Two-line output control (E + G)	Enables hierarchical memory mapping: E selects chip, G gates output - eliminates bus contention in 4+ device arrays without glue logic.
PRESTO II programming algorithm	Guarantees cell margin via automatic verify-in-margin-mode; achieves full array programming in ≤26.5 s without overprogramming pulses.
Electronic Signature (20h/44h)	Allows zero-configuration programmer auto-detection - eliminates manual part-number selection in production programming stations.
ECOPACK® lead-free packaging	Meets RoHS Directive 2011/65/EU and JEDEC JESD97; inner box labeling includes second-level interconnect category for traceability.
UV-erasable architecture	Supports field firmware updates via quartz-window UV lamps - critical for aerospace, medical, and industrial control systems with long service life.

Applications

Industrial PLC Firmware Storage

Avionics Boot ROM

Use Scenario: Storing ladder logic interpreter and I/O configuration tables in DIN-rail mounted programmable logic controllers requiring 10+ year field reliability.

IC Role / Device Role / Timing Role: Nonvolatile boot-time instruction store accessed at power-on reset; 45 ns access ensures deterministic scan-cycle timing under 20 kHz update rates.

Use Value: UV erasability allows firmware patching in deployed units without board replacement; PLCC44 reworkability supports repair depot workflows.

Use Scenario: Holding flight-critical boot code and sensor calibration constants in airborne mission computers operating across –40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Primary ROM for MIL-STD-1553B bus controller initialization; dual VSS pins minimize ground shift during EMI-heavy avionics startup sequences.

Use Value: 100 µA standby current extends battery-backed retention during aircraft ground downtime; ECOPACK® compliance meets DO-254 hardware assurance requirements.

Medical Imaging System BIOS

Legacy Test Equipment Calibration Data

Use Scenario: Storing FPGA configuration bitstreams and DICOM protocol stacks in ultrasound and MRI front-end controllers with 15-year product lifecycle.

IC Role / Device Role / Timing Role: Shadow ROM mapped to CPU address space; PRESTO II programming enables factory calibration data injection post-assembly without socket adapters.

Use Value: 12.75 V VPP threshold prevents spurious writes from ESD events; Electronic Signature ensures correct algorithm loading during automated test.

Use Scenario: Archiving instrument-specific ADC offset/gain coefficients and self-test vectors in benchtop oscilloscopes and spectrum analyzers manufactured 1995–2010.

IC Role / Device Role / Timing Role: Calibration data vault accessed only during service mode; NC pins (12,22,33,34) provide layout margin for analog isolation zones.

Use Value: 2537 Å UV erasure enables recalibration after sensor drift; PLCC44 thermal mass stabilizes parameter retention across 0–50°C lab environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar UV-erasable EPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C4002-90DC	Same 4 Mbit ×16 organization, 45 ns access, but uses AMD's proprietary programming algorithm and signature codes (01h/44h); requires AMD-specific programmers.	Valid for drop-in replacement in AMD-based designs; incompatible with ST-programmer auto-detection due to different Electronic Signature.	Select only if existing toolchain supports AMD signature and PRESTO II is not required.
MX27C4002-90PC	Macronix variant with identical pinout and DC specs, but 55 ns max access time and 12.5 V ±0.5 V VPP tolerance - wider programming voltage window.	Suitable for cost-sensitive industrial controls where 10 ns timing margin is acceptable; lacks ST's ECOPACK® certification.	Prefer when RoHS documentation is not mandated and programming infrastructure tolerates looser VPP regulation.

Compared with AM27C4002-90DC and MX27C4002-90PC, the M27C4002-90C1 provides guaranteed PRESTO II margin programming, ST-specific Electronic Signature for seamless tool integration, and full ECOPACK® compliance - making it the optimal choice for repair, calibration, and legacy system sustainment where firmware integrity and regulatory traceability are mandatory.

Availability

M27C4002-90C1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, avionics boot ROM, and medical imaging system BIOS requiring stable component supply amid obsolescence management challenges.

Supply support for M27C4002-90C1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and power management applications since 1987.

The M27C4002 belongs to ST's legacy EPROM product line, engineered specifically for long-lifecycle industrial control, aerospace, and medical equipment where field-upgradable nonvolatile storage and UV-based reprogramming remain essential design requirements.

FAQ

Is M27C4002-90C1 UV-erasable despite its PLCC44 package?

No - the PLCC44 variant (suffix C) is OTP-only. UV erasure requires the FDIP40W ceramic package with quartz window. The M27C4002-90C1 retains UV-erasable architecture internally but is factory-sealed; its data can only be programmed once. This is confirmed in ST's April 2006 Rev 4 datasheet Section 1: "For applications where content is programmed only one time… offered in PDIP40, PLCC44 and TSOP40".

What is the minimum UV dose required to erase M27C4002-90C1?

M27C4002-90C1 cannot be UV-erased - it is OTP. However, the underlying M27C4002 UV EPROM specification requires ≥15 W·sec/cm² at 2537 Å wavelength. This value is derived from Table 4 (Erasure Operation) and validated for FDIP40W packages only. PLCC44 has no UV-transparent path; attempting exposure yields no effect.

Does M27C4002-90C1 support standard 5 V programming?

No - programming requires VPP = 12.75 V ±0.25 V and VCC = 6.25 V ±0.25 V simultaneously. Standard 5 V operation applies only to read mode. This is specified in Section 2.5 (Programming) and Table 8 (Programming Mode DC Characteristics). Using 5 V on VPP will fail to inject charge into floating gates.

Can M27C4002-90C1 be used in new designs today?

Yes - for legacy system repair, calibration, and obsolescence mitigation where functional equivalence and long-term supply are prioritized over power efficiency or density. It remains actively stocked by Aetrix for industrial, aerospace, and medical maintenance programs, with full traceability and ECOPACK® documentation provided per order.

M27C4002-90C1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 44-LCC (J-Lead)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EPROM

Technology:: EPROM - OTP

Memory Size:: 4Mbit

Memory Organization:: 256K x 16

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: 90 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 44-PLCC (16.59x16.59)

M27C4002-90C1 FAQ

1.How can I place an order for M27C4002-90C1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27C4002-90C1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M27C4002-90C1 reliable?

The price and inventory of M27C4002-90C1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4002-90C1 is usually 5 days.

3.What payment methods are accepted for M27C4002-90C1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4002-90C1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27C4002-90C1?

M27C4002-90C1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27C4002-90C1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M27C4002-90C1?

For technical support, including M27C4002-90C1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4002-90C1 requirements.

6.How does Aetrix verify that M27C4002-90C1 is sourced from the original manufacturer or authorized distributors?

All M27C4002-90C1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M27C4002-90C1 meets industry standards.

7.What is the process for return or replacement of M27C4002-90C1?

All M27C4002-90C1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4002-90C1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M27C4002-90C1 part is unused and in its original packaging.

Return procedure for M27C4002-90C1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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