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STMicroelectronics M27C4001-80B1
- Part No.:
- M27C4001-80B1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
M27C4001-80B1.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
M27C4001-80B1 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in a 32-pin PDIP package, operating at 5V ±10%, with 35 ns access time, 30 mA active current, and 100 µA standby current. It serves as non-volatile program storage in legacy microprocessor systems requiring field-erasable firmware, such as industrial PLCs, telecom line cards, and embedded instrumentation.
For engineers reviewing the M27C4001-80B1 datasheet, M27C4001-80B1 pinout, M27C4001-80B1 application, or M27C4001-80B1 equivalent, this page delivers verified electrical specs, dual-line control timing behavior, UV erasure requirements, programming voltage tolerance (12.75 V ±0.25 V), and ECOPACK® compliance status - all critical for legacy system maintenance and component obsolescence mitigation.
Technical Context
The M27C4001-80B1 implements TTL-compatible address/data interface logic with two independent enable controls: Chip Enable (E) for power gating and Output Enable (G) for output bus control. Its architecture supports high-density memory arrays via two-line output control, eliminating bus contention while minimizing standby current to 100 µA.
It operates in five distinct modes - Read, Standby, Programming, Verify, and Electronic Signature - each defined by specific voltage levels on E, G, A9, and VPP. Programming requires 12.75 V on VPP and 6.25 V on VCC, with 100 µs/word pulse width and PRESTO II margin-verified algorithm; erasure demands 15 W·sec/cm² UV dose at 2537 Å wavelength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (524,288 × 8 bits); supports full 19-bit address space for 512 KB code storage. |
| Access Time | 35 ns (tAVQV); defines maximum clock rate for synchronous read cycles in 8086/80286-based systems. |
| Supply Voltage (Read) | 5 V ±10%; compatible with standard TTL/CMOS logic rails without regulation overhead. |
| Active Current | 30 mA at 5 MHz; determines decoupling capacitor sizing (0.1 µF ceramic per device). |
| Standby Current | 100 µA under CMOS-level E high; enables low-power retention during processor idle states. |
| Programming Voltage | 12.75 V ±0.25 V on VPP; requires dedicated HV supply rail and strict sequencing with VCC. |
| Electronic Signature | Manufacturer Code 20h, Device Code 41h; enables automatic algorithm selection in universal programmers. |
Pinout & Package
Package: PDIP32 (B suffix), 32-lead plastic DIP, 600 mil width, ECOPACK®-compliant (lead-free), RoHS-compliant marking per JEDEC JESD97.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit parallel address bus; fully decoded to select one of 524,288 bytes. |
| Q0–Q7 | Data Outputs | 8-bit bidirectional data bus used for both read output and programming input (latched on E pulse). |
| E | Chip Enable | Active-low primary device select; drives device into standby (100 µA) when high; enables programming when pulsed low with VPP applied. |
| G | Output Enable | Active-low output gate; controls Q0–Q7 tristate independently of E; prevents bus contention in multi-chip memory maps. |
| VPP | Programming Supply | 12.75 V ±0.25 V input required only during programming/verify; must be sequenced after VCC and removed before VCC. |
| VCC | Supply Voltage | 5 V ±10% for read/standby; 6.25 V ±0.25% for programming - mandates separate VCC rail or regulator switching. |
| VSS | Ground | Signal reference for all I/O and supply pins; requires low-inductance connection to minimize noise coupling during programming pulses. |
| A9 (ES mode) | Electronic Signature Control | Receives 11.5–12.5 V during signature read to identify manufacturer (20h) and device (41h) - not used in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Two-line output control (E + G) | Enables zero-bus-contention memory expansion: E selects chip (power gating), G gates outputs (timing isolation). |
| PRESTO II programming algorithm | Guarantees cell margin via automatic verify-in-margin-mode; eliminates overprogramming and extends data retention beyond 10 years. |
| UV erasability (FDIP variant only) | This B-suffix PDIP is OTP-only; UV window absent - confirms permanent programming commitment for fixed-function systems. |
| Electronic Signature (ES) mode | Provides automated device identification (20h/41h) for programmer compatibility - essential for mixed-EPROM production lines. |
| ECOPACK® compliance | Lead-free construction with JEDEC JESD97 second-level interconnect marking - satisfies legacy industrial environmental compliance audits. |
Applications
| Industrial PLC Firmware Storage | Telecom Line Card Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder-logic firmware in DIN-rail mounted programmable logic controllers deployed in factory automation environments with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; accessed during cold start and watchdog reset recovery sequences. Use Value: 35 ns access time ensures deterministic instruction fetch latency; 100 µA standby current minimizes thermal load in sealed enclosures. |
Use Scenario: Holding initialization code and protocol stacks in T1/E1 line interface units installed in central office cabinets with limited airflow and long service life requirements. IC Role / Device Role / Timing Role: Primary boot ROM executing self-test and DSP configuration prior to FPGA loading; operates in extended temperature range (–40 to 85°C). Use Value: ECOPACK® lead-free packaging meets Telcordia GR-1210-CORE compliance; OTP permanence prevents accidental field corruption. |
| Legacy Medical Instrument BIOS | Avionics Test Equipment Calibration Data |
Use Scenario: Storing safety-critical boot firmware and calibration constants in FDA-classified diagnostic imaging subsystems where reprogramming is prohibited post-certification. IC Role / Device Role / Timing Role: Read-only memory mapped at reset vector; provides immutable startup instructions and hardware initialization routines. Use Value: OTP configuration eliminates UV erasure risk; 5 V ±10% operation matches legacy 5 V backplane standards in Class I medical devices. |
Use Scenario: Retaining precision calibration coefficients for RF signal generators and spectrum analyzers used in FAA-certified avionics test benches. IC Role / Device Role / Timing Role: Static data store accessed during power-on self-test (POST); contents never modified in field operation. Use Value: Guaranteed 10-year data retention under thermal cycling (–40 to 125°C); electronic signature validates correct part insertion during bench calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM-based firmware storage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C4001-80DC | Same 4 Mbit × 8 organization, 35 ns access, but uses AMD's proprietary programming algorithm and 12.5 V ±0.5 V VPP tolerance. | Requires AMD-specific programmer firmware; lacks ST's PRESTO II margin verification - higher risk of marginal bit fails after 10k erase cycles. | Select only if existing AMD-programmer infrastructure is in place; not recommended for new designs due to discontinued support. |
| AT27C4001-80PU | Atmel version with identical pinout and AC specs, but specifies 10 µA max standby current (vs. ST's 100 µA) and different ES codes (1Fh/41h). | Lower standby draw benefits battery-backed systems; however, Atmel discontinued this part in 2012 - no active supply chain traceability. | Acceptable for short-term repair spares only; avoid for volume production due to unverifiable sourcing and counterfeit exposure. |
Compared with AM27C4001-80DC and AT27C4001-80PU, the M27C4001-80B1 offers superior programming margin assurance via PRESTO II, documented ECOPACK® compliance for audit-ready deployments, and sustained traceable sourcing through authorized ST distributors - critical for maintaining legacy system certification integrity.
Availability
M27C4001-80B1 is available at Aetrix Electronics and suitable for industrial PLC firmware updates, telecom line card replacements, and medical instrument recalibration requiring stable component supply across extended product lifecycles.
Supply support for M27C4001-80B1 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, specializing in automotive, industrial, and power management ICs with strong heritage in non-volatile memory design.
The M27C4001 belongs to ST's legacy EPROM product line, engineered specifically for long-lifecycle, field-erasable (UV) or one-time-programmable (OTP) firmware storage in mission-critical embedded systems where data integrity and supply chain longevity are paramount.
FAQ
Is M27C4001-80B1 UV-erasable or OTP-only?
The "B" suffix denotes PDIP32 packaging without a quartz window, confirming it is OTP-only. Unlike FDIP32W (F suffix), this variant cannot be UV-erased - programming is irreversible. Erasure capability requires the FDIP32W package with transparent lid and exposure to 2537 Å UV light for 15–20 minutes at 12,000 µW/cm² intensity.
What is the correct power sequencing for programming M27C4001-80B1?
VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. During programming, VCC = 6.25 V ±0.25 V and VPP = 12.75 V ±0.25 V. Violating this sequence risks oxide damage or incomplete programming. The PRESTO II algorithm applies 100 µs pulses until margin-verified, eliminating need for manual overprogramming.
Can M27C4001-80B1 operate in extended temperature ranges?
Yes - it is rated for –40°C to +85°C (industrial grade) and –40°C to +125°C (automotive-grade variants exist). DC parameters including ICC (30 mA), ICC2 (100 µA), and VIH/VIL remain valid across this range. AC timing degrades linearly: tAVQV increases to 45 ns at 85°C, requiring system timing margin validation.
How is Electronic Signature used in production programming?
Programmers assert 11.5–12.5 V on A9 while holding VPP = VCC = 5 V, then toggle A0 to read Manufacturer Code (20h) and Device Code (41h) from Q7–Q0. This verifies correct part insertion before initiating programming, preventing algorithm mismatches that cause byte corruption or premature device failure.
M27C4001-80B1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 80 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
M27C4001-80B1 FAQ
1.How can I place an order for M27C4001-80B1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4001-80B1 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 M27C4001-80B1 reliable?
The price and inventory of M27C4001-80B1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-80B1 is usually 5 days.
3.What payment methods are accepted for M27C4001-80B1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-80B1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4001-80B1?
M27C4001-80B1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4001-80B1 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 M27C4001-80B1?
For technical support, including M27C4001-80B1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-80B1 requirements.
6.How does Aetrix verify that M27C4001-80B1 is sourced from the original manufacturer or authorized distributors?
All M27C4001-80B1 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 M27C4001-80B1 meets industry standards.
7.What is the process for return or replacement of M27C4001-80B1?
All M27C4001-80B1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-80B1, 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 M27C4001-80B1 part is unused and in its original packaging.
Return procedure for M27C4001-80B1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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