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STMicroelectronics M27C512-12C1

Name: M27C512-12C1
Brand: STMicroelectronics
SKU: M27C512-12C1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27C512-12C1

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 32-LCC (J-Lead)

Datasheet:: M27C512-12C1.pdf

Description:: IC EPROM 512KBIT PARALLEL 32PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M27C512-12C1 from STMicroelectronics is a 512 Kbit (64K × 8) OTP EPROM in PLCC32 package, operating at 5V ±10%, with 120 ns access time, 30 mA active current, and 100 µA standby current. It supports TTL-level addressing/data, electronic signature (manufacturer code 20h, device code 3Dh), and PRESTO IIB programming (≈6 s). Used in legacy industrial controllers for firmware storage where one-time programming and UV-erasure-free operation are required.

For engineers reviewing the M27C512-12C1 datasheet, M27C512-12C1 pinout, M27C512-12C1 application, or M27C512-12C1 equivalent, key selection criteria include verified 120 ns read timing under 5V supply, PLCC32 mechanical compatibility, OTP-only programming voltage (12.75 V ±0.25 V), and electronic signature support for automated programmer recognition.

Technical Context

The M27C512-12C1 implements a two-line output control architecture using Chip Enable (E) for power gating and Output Enable (G) for bus contention avoidance-enabling low-power memory arrays without output conflicts. Its PRESTO IIB programming algorithm applies 100 µs pulses per byte with margin-mode verify, eliminating overprogramming while guaranteeing reliability at 6.25 V VCC and 12.75 V VPP.

Electronic signature mode requires 11.5–12.5 V on A9 and toggling A0 to read manufacturer (20h) and device (3Dh) codes-critical for programming equipment auto-detection. The device operates across –40°C to +125°C ambient, with CMOS-compatible inputs and TTL/CMOS-selectable outputs (VOH = VCC – 0.7 V in CMOS mode).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	512 Kbit (64K × 8) - fixed parallel organization; no address multiplexing required.
Access Time	120 ns - guaranteed tAVQV and tELQV delay under standard AC conditions (CL = 100 pF).
Supply Voltage	5 V ±10% - single-supply read operation; 6.25 V ±0.25 V required during programming.
Active Current	30 mA - measured at 5 MHz address toggle rate with E/G low; defines system power budget.
Standby Current	100 µA - achieved when E = VIH (CMOS high); enables low-quiescent power in idle states.
Programming Voltage	12.75 V ±0.25 V on GVPP - precise VPP tolerance ensures cell threshold margin and endurance.
Electronic Signature	Manufacturer code 20h, Device code 3Dh - read via A9 = 12 V and A0 toggle; enables plug-and-play programmer compatibility.

Pinout & Package

PLCC32 (Plastic Leaded Chip Carrier, 32-pin) with 11.43 mm × 13.97 mm body, J-lead profile, and moisture sensitivity level (MSL) 3 per JEDEC J-STD-020. Lead-free ECOPACK® compliant.

Pin/Terminal	Circuit Role	Design Meaning
A0–A15	Address Inputs	16-bit parallel address bus; latched internally on E transition; TTL-compatible thresholds.
Q0–Q7	Data Outputs	8-bit bidirectional data bus during programming; outputs Hi-Z when E or G high.
E	Chip Enable	Primary device select; CMOS high (≥ VCC – 0.2 V) forces standby mode and Hi-Z outputs.
G	Output Enable	Secondary output gate; independent of E; controls Q0–Q7 drive enable for bus arbitration.
GVPP	Program Supply Input	Accepts 12.75 V ±0.25 V during programming; internally regulated for cell injection control.
VCC	Supply Voltage	5 V ±10% for read; 6.25 V ±0.25 V for programming; decoupling requires 0.1 µF ceramic + 4.7 µF bulk per 8 devices.
VSS	Ground	Reference for all I/O and internal logic; must be low-inductance connection to minimize noise coupling.
A9	Signature Address Line	Bias to 11.5–12.5 V for Electronic Signature mode; not used in normal read/program operations.

Key Features

Feature	Design Value
Two-line output control (E + G)	Enables zero-bus-contention memory expansion; E selects device power state, G gates output drivers independently.
PRESTO IIB programming	Reduces full-array programming to ≈6 s via margin-mode verify and adaptive pulse count-no overprogram risk.
Electronic Signature (20h/3Dh)	Allows automatic device identification by programmers without manual part selection-reduces setup errors.
ECOPACK® compliance	Lead-free PLCC32 package meeting JEDEC JESD97 second-level interconnect marking and RoHS requirements.
Wide temperature range	Specified operation from –40°C to +125°C ambient-validated for industrial control and automotive under-hood use.

Applications

Industrial PLC Firmware Storage

Legacy Medical Device Boot Code

Use Scenario: Storing immutable boot firmware in programmable logic controllers deployed in factory automation environments with ambient temperatures up to 70°C.

IC Role / Device Role / Timing Role: Non-volatile program memory providing deterministic 120 ns read access to instruction fetch bus; powered only during CPU reset or firmware update.

Use Value: Eliminates need for UV erasure infrastructure; OTP reliability prevents accidental overwrite during field maintenance or power cycling.

Use Scenario: Holding certified diagnostic initialization code in Class II medical instruments requiring long-term data retention (>10 years) without battery backup.

IC Role / Device Role / Timing Role: Standalone 8-bit parallel ROM interfaced directly to microcontroller address/data bus; accessed only at power-on reset.

Use Value: 100 µA standby current minimizes self-discharge impact on backup capacitors; ECOPACK® compliance meets IEC 60601-1 material restrictions.

Avionics Configuration Memory

Test Equipment Calibration Data

Use Scenario: Storing aircraft subsystem configuration tables in flight-critical avionics where reprogramming is prohibited after certification.

IC Role / Device Role / Timing Role: Read-only memory mapped to fixed address space; accessed via dedicated FPGA interface with strict timing closure at 120 ns.

Use Value: Guaranteed 120 ns tAVQV under –40°C to +85°C ensures deterministic boot timing across operational envelope.

Use Scenario: Embedding calibration coefficients in automated test equipment (ATE) mainframes requiring traceable, unalterable reference data.

IC Role / Device Role / Timing Role: Static memory holding 64K × 8 lookup tables for analog front-end compensation; accessed via GPIB or PXI controller.

Use Value: Electronic signature (20h/3Dh) enables automated verification during manufacturing test-ensuring correct part insertion before calibration upload.

Equivalent & Alternatives

The following parts are listed as comparable options for similar OTP EPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C512-12DC	120 ns access, 5 V supply, but uses PDIP28 package and lacks electronic signature (no A9-based ID mode).	Requires PCB redesign for through-hole mounting; incompatible with PLCC32 footprint and automated signature-based programming.	Select only if legacy PDIP layout reuse is mandatory and signature verification is unnecessary.
AT27C512R-12JC	120 ns, PLCC32, 5 V, but supports both OTP and UV-erase variants; higher standby current (200 µA vs. 100 µA).	UV-erasable version introduces accidental erasure risk in fluorescent-lit labs; 100 µA advantage lost in low-power systems.	Choose only if future firmware updates via UV erasure are planned; otherwise M27C512-12C1 offers superior standby efficiency.

Compared with AM27C512-12DC and AT27C512R-12JC, the M27C512-12C1 uniquely combines PLCC32 packaging, guaranteed 120 ns timing, electronic signature, and lowest standby current-making it optimal for space-constrained, signature-dependent, and ultra-low-quiescent industrial designs.

Availability

M27C512-12C1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot code, avionics configuration memory, and test equipment calibration data requiring stable component supply across extended product lifecycles.

Supply support for M27C512-12C1 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, designing and manufacturing microcontrollers, memories, power ICs, and sensors for industrial, automotive, and consumer markets.

The M27C512 belongs to ST's legacy EPROM product line, engineered specifically for cost-sensitive, high-reliability embedded systems requiring one-time programmable non-volatility without battery backup or flash wear leveling.

FAQ

Is M27C512-12C1 UV-erasable or OTP-only?

The M27C512-12C1 is an OTP (One-Time Programmable) variant housed in a PLCC32 package, which lacks the quartz window required for UV erasure. Unlike FDIP28W versions, it cannot be erased-programming is permanent. This is confirmed by ST's device summary table and package designation "C" (PLCC32) with no UV-erase specification in its datasheet sections.

What is the exact meaning of "-12" in M27C512-12C1?

The "-12" suffix denotes 120 ns access time (tAVQV and tELQV), validated under standard AC measurement conditions (CL = 100 pF, input rise/fall ≤20 ns). This is explicitly defined in Table 10 of the datasheet, where "-12" corresponds to Min/Max values of 120/150 ns for address-to-output and chip-enable-to-output delays.

Can M27C512-12C1 operate at 3.3 V?

No. The M27C512-12C1 requires 5 V ±10% (4.5–5.5 V) for read operation and 6.25 V ±0.25 V for programming. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive (VOH = 3.6 V TTL, VCC – 0.7 V CMOS) are specified only for 5 V operation-3.3 V violates absolute maximum ratings and invalidates timing guarantees.

Does M27C512-12C1 support common bus sharing with other memory devices?

Yes, via its two-line output control: Chip Enable (E) places the device in standby (Hi-Z outputs, 100 µA draw) when inactive, while Output Enable (G) independently gates Q0–Q7 drivers. This allows multiple M27C512-12C1 devices to share a data bus without contention-confirmed in Section 2.3 and Operating Modes Table 3 of the datasheet.

M27C512-12C1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 32-LCC (J-Lead)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EPROM

Technology:: EPROM - OTP

Memory Size:: 512Kbit

Memory Organization:: 64K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: 120 ns

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-PLCC (11.43x13.97)

M27C512-12C1 FAQ

1.How can I place an order for M27C512-12C1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27C512-12C1 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 M27C512-12C1 reliable?

The price and inventory of M27C512-12C1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C512-12C1 is usually 5 days.

3.What payment methods are accepted for M27C512-12C1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C512-12C1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27C512-12C1?

M27C512-12C1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27C512-12C1 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 M27C512-12C1?

For technical support, including M27C512-12C1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C512-12C1 requirements.

6.How does Aetrix verify that M27C512-12C1 is sourced from the original manufacturer or authorized distributors?

All M27C512-12C1 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 M27C512-12C1 meets industry standards.

7.What is the process for return or replacement of M27C512-12C1?

All M27C512-12C1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C512-12C1, 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 M27C512-12C1 part is unused and in its original packaging.

Return procedure for M27C512-12C1:

1.Submit a request within 90 days.

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

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