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STMicroelectronics M27C801-90F1
- Part No.:
- M27C801-90F1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C801-90F1.pdf
- Description:
- IC EPROM 8MBIT PARALLEL 32CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,646
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Product details
Overview
M27C801-90F1 from STMicroelectronics is an 8 Mbit (1,048,576 × 8) UV-erasable EPROM in FDIP32W ceramic frit-seal package with transparent quartz window, supporting 5 V ±10% read supply, 55 ns access time, and 12.75 V ±0.25 V programming voltage. It features two-line output control (E and GVPP), electronic signature (20h manufacturer code / 42h device code), and ECOPACK® lead-free compliance for industrial memory applications requiring field-erasable firmware storage.
For engineers reviewing the M27C801-90F1 datasheet, M27C801-90F1 pinout, M27C801-90F1 application, or M27C801-90F1 equivalent, this page delivers verified technical context, real-world timing behavior, package-specific layout guidance, and validated alternatives for legacy system maintenance and requalification.
Technical Context
The M27C801-90F1 operates in five distinct modes-Read, Output Disable, Program, Program Inhibit, and Standby-controlled by E (Chip Enable), GVPP (Output Enable / Program Supply), and A9 (Electronic Signature/Margin Mode). Its dual-control architecture enables low-power array operation: E selects the device while GVPP gates outputs independently, eliminating bus contention across multi-chip memory systems.
Programming uses Presto IIB algorithm with 50 µs/word pulses at VCC = 6.25 V ±0.25 V and VPP = 12.75 V ±0.25 V; verification occurs in margin mode at reduced VCC (4.2 V and 6 V) to ensure cell-level reliability. Erasure requires UV exposure (2537 Å, ≥30 W·sec/cm²) through the FDIP32W window, with full erasure achieved in 30–40 minutes at 12,000 µW/cm² intensity within 2.5 cm of lamp source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Mbit (1,048,576 × 8 organization) |
| Access time | 55 ns - defines maximum clock rate for synchronous read cycles in legacy microcontroller buses |
| Read supply | 5 V ±10% - compatible with standard TTL/CMOS logic rails without level shifting |
| Programming voltage | 12.75 V ±0.25 V - requires dedicated HV supply rail; not derived from VCC |
| Standby current | 100 µA - enables low-power retention during CPU wait states or sleep modes |
| Electronic signature | 20h (STMicroelectronics) / 42h (M27C801) - enables auto-detection in universal programmers |
| UV erasure dose | ≥30 W·sec/cm² at 2537 Å - quantifies minimum UV energy required for full bit reset |
Pinout & Package
FDIP32W (32-pin ceramic frit-seal DIP with round quartz window) provides UV transparency for field erasure and hermetic sealing for long-term data retention in industrial environments. Pin 1 is marked by notch; pin 17 is VSS (ground); pin 32 is VCC (5 V supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A19 | Address inputs | 20-bit address bus interface; supports full 1 Mbyte addressing space |
| Q0–Q7 | Data outputs | 8-bit bidirectional data path used for both read output and parallel programming input |
| E | Chip Enable | Primary device selection signal; CMOS high places device in 100 µA standby mode |
| GVPP | Output Enable / Program Supply | Active-low output gate in read mode; supplies 12.75 V to internal programming circuitry when pulsed |
| VCC | Supply voltage | 5 V ±10% for read; 6.25 V ±0.25 V required during programming |
| VSS | Ground | Reference return for all DC and AC signaling; decoupling capacitor must be placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Two-line output control (E + GVPP) | Enables zero-bus-contention memory arrays by separating device selection from output gating |
| Presto IIB programming algorithm | Guarantees reliable programming margin via dual-voltage verify (6 V / 4.2 V) without overprogramming |
| Electronic signature (20h/42h) | Allows automatic device identification and algorithm selection in production programming equipment |
| ECOPACK® lead-free packaging | Meets JEDEC JESD97 interconnect category marking and RoHS-compliant soldering profiles |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Calibration |
|---|---|
Use Scenario: Storing boot firmware and configuration tables in programmable logic controllers operating in extended temperature ranges (–40 °C to 85 °C). IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into microcontroller address space; accessed via asynchronous 55 ns read cycles. Use Value: UV-erasability allows field updates without PCB rework; FDIP32W hermeticity ensures >10-year data retention in dusty, humid factory environments. | Use Scenario: Holding engine calibration maps and diagnostic lookup tables in pre-OBD-II automotive control units. IC Role / Device Role / Timing Role: Read-only instruction/data store interfaced to 8051 or Motorola 68HC11 derivatives; timing governed by tELQV (55 ns) and tGHQZ (25 ns). Use Value: Electronic signature enables automated calibration flash verification; ECOPACK® compliance satisfies early automotive RoHS requirements. |
| Military Radio Boot ROM | Test Equipment Pattern Memory |
Use Scenario: Secure boot image storage in HF/VHF tactical radios requiring radiation-tolerant, long-life nonvolatile memory. IC Role / Device Role / Timing Role: Cold-start execution memory; erased and reprogrammed only during depot-level maintenance using UV chamber and dedicated programmer. Use Value: Ceramic FDIP32W package withstands thermal shock and MIL-STD-883 environmental stress; 100 µA standby current extends battery life during standby. | Use Scenario: Storing digital stimulus/response patterns in automated test equipment (ATE) for semiconductor wafer probing. IC Role / Device Role / Timing Role: High-speed pattern buffer accessed synchronously with test clock; relies on tAVQV = 55 ns for deterministic timing alignment. Use Value: Parallel 8-bit programming enables rapid pattern loading; two-line control prevents glitch-induced bus conflicts during pattern switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UV-erasable EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C801-90DC | Same 8 Mbit × 8 organization, 55 ns access, but uses AMD's CERDIP32 package with different mechanical dimensions and window spectral transmission | Requires board-level footprint redesign due to alternate pin 1 location and body width; UV erasure time differs by ±15% under identical lamp conditions | Select only when AM27C801-90DC is already qualified in your design and UV chamber calibration matches its spectral response. |
| MBM27C801-90P | Fujitsu PLCC32 OTP variant - no UV window, fixed content after programming, lower standby current (50 µA), same AC timing | Eliminates UV erasure step but prohibits field firmware updates; requires socket or reflow-compatible PLCC footprint instead of DIP | Choose for cost-sensitive, high-volume production where firmware is finalized and field updates are unnecessary. |
Compared with AM27C801-90DC and MBM27C801-90P, the M27C801-90F1 uniquely supports field-erasable firmware in a hermetically sealed ceramic DIP, making it irreplaceable for legacy repair, calibration lab use, and military depot maintenance where reprogrammability and environmental ruggedness are mandatory.
Availability
M27C801-90F1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU calibration, military radio boot ROM, and test equipment pattern memory requiring stable component supply amid obsolescence challenges.
Supply support for M27C801-90F1 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 M27C801 belongs to ST's legacy EPROM product line, designed specifically for high-reliability, field-upgradable firmware storage in industrial control, defense, and automotive systems where UV erasability and long-term data retention were critical design requirements.
FAQ
What UV wavelength and exposure time are required to fully erase the M27C801-90F1?
Full erasure requires short-wave ultraviolet light at 2537 Å wavelength with a minimum integrated dose of 30 W·sec/cm². Using a standard 12,000 µW/cm² UV lamp, place the FDIP32W window within 2.5 cm of the source for 30–40 minutes. Avoid fluorescent lighting exposure, as ambient room light may cause partial erasure over months.
Can the M27C801-90F1 be programmed using a standard 5 V supply?
No. Programming requires VCC = 6.25 V ±0.25 V and VPP = 12.75 V ±0.25 V applied simultaneously, with VCC powered before and removed after VPP. A dedicated high-voltage programming supply is mandatory; applying 5 V to VPP will not initiate programming and may damage the device.
How does the two-line output control (E and GVPP) prevent bus contention in multi-chip memory systems?
E acts as chip select: when high, the device enters 100 µA standby and forces outputs to high-impedance regardless of GVPP state. GVPP controls output drivers only when E is low. This ensures deselected chips draw minimal current and never drive the data bus, eliminating contention even when multiple devices share Q0–Q7 lines.
Is the M27C801-90F1 RoHS compliant?
Yes - the M27C801-90F1 carries ST's ECOPACK® designation, confirming lead-free terminations and compliance with JEDEC JESD97 interconnect category marking. The FDIP32W package uses lead-free solderable pins and meets RoHS Directive 2011/65/EU requirements for restricted substances.
M27C801-90F1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-CDIP (0.600", 15.24mm) Window
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - UV
- Memory Size:
- 8Mbit
- Memory Organization:
- 1M x 8
- 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:
- Through Hole
- Supplier Device Package:
- 32-CDIP Frit Seal with Window
M27C801-90F1 FAQ
1.How can I place an order for M27C801-90F1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C801-90F1 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 M27C801-90F1 reliable?
The price and inventory of M27C801-90F1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C801-90F1 is usually 5 days.
3.What payment methods are accepted for M27C801-90F1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C801-90F1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C801-90F1?
M27C801-90F1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C801-90F1 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 M27C801-90F1?
For technical support, including M27C801-90F1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C801-90F1 requirements.
6.How does Aetrix verify that M27C801-90F1 is sourced from the original manufacturer or authorized distributors?
All M27C801-90F1 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 M27C801-90F1 meets industry standards.
7.What is the process for return or replacement of M27C801-90F1?
All M27C801-90F1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C801-90F1, 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 M27C801-90F1 part is unused and in its original packaging.
Return procedure for M27C801-90F1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C801-90F1 Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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