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STMicroelectronics M27C4001-70C1
- Part No.:
- M27C4001-70C1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
M27C4001-70C1.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,974
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Product details
Overview
M27C4001-70C1 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in PDIP32 package, operating at 5V ±10%, with 35ns access time, 30mA active current, and 100µA standby current. It serves as non-volatile program storage in legacy microprocessor systems requiring field-erasable firmware, such as industrial PLCs and embedded controllers with UV-erase maintenance capability.
For engineers reviewing the M27C4001-70C1 datasheet, M27C4001-70C1 pinout, M27C4001-70C1 application, or M27C4001-70C1 equivalent, key selection criteria include UV-erase compatibility, TTL-level address/data interface, two-line output control (E/G), 12.75V programming voltage, and ECOPACK®-compliant lead-free PDIP32 packaging.
Technical Context
The M27C4001-70C1 implements a standard NMOS EPROM architecture with dual-control read enable logic: Chip Enable (E) gates power and device selection, while Output Enable (G) independently controls output buffer activation. This enables low-power memory array expansion without bus contention.
It supports three critical operational modes: Read (VCC = 5V, E/G = L), Standby (E = H → ICC = 100µA), and Programming (VPP = 12.75V ±0.25V, VCC = 6.25V ±0.25V, E pulsed low). Erasure requires UV exposure through the ceramic window - not applicable to this PDIP32 variant, which is OTP-capable but lacks erasure functionality per its package type.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (524,288 × 8 bits) - supports full 19-bit address space for boot code or firmware storage |
| Access Time | 35 ns - determines maximum CPU bus clock rate compatible with zero-wait-state operation |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current | 30 mA at 5 MHz - defines power budget for memory subsystem in active execution |
| Standby Current | 100 µA - enables low-power retention during processor idle cycles |
| Programming Voltage | 12.75 V ±0.25 V - requires dedicated HV supply rail; not derived from VCC |
| Programming Time | 100 µs/word - sets minimum write cycle duration for firmware updates |
Pinout & Package
Packaged in 32-pin Plastic Dual In-line Package (PDIP32, 600 mil width), RoHS-compliant and ECOPACK® certified. Pin 1 index notch located at top-left corner when viewed from top with pins facing downward.
| 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 |
| E | Chip Enable | Active-low primary device select; places device in standby (high-Z outputs) when high |
| G | Output Enable | Active-low secondary output gate; enables Q0–Q7 only when E is also low |
| VPP | Programming Supply | 12.75 V input required exclusively during programming; must be stable before E pulse |
| VCC | Power Supply | +5 V main supply; must be applied simultaneously with or before VPP |
| VSS | Ground | Signal and power reference plane; decoupling capacitor (0.1 µF) required adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Two-line output control (E + G) | Eliminates bus contention in multi-chip memory arrays by separating device selection from output gating |
| Electronic Signature mode | Manufacturer code 20h and device code 41h readable via A9/VID and A0 toggling - enables auto-algorithm selection in programmers |
| PRESTO II programming algorithm | Guarantees margin-safe programming in ≤52.5 s via iterative 100 µs pulses and verify-in-margin-mode |
| ECOPACK® compliance | Lead-free PDIP32 package meeting JEDEC JESD97 interconnect marking and RoHS requirements |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
Use Scenario: Storing ladder logic firmware in programmable logic controllers deployed in factory automation environments with infrequent field updates. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; accessed during power-on reset sequence with fixed 35 ns timing window. Use Value: UV-erasable capability allows reprogramming after physical removal and exposure to UV lamp - enabling firmware patching without PCB replacement. | Use Scenario: Providing immutable startup code for 8/16-bit microcontrollers in medical diagnostic instruments where regulatory validation prohibits field-upgradable flash. IC Role / Device Role / Timing Role: Primary ROM executing cold-start initialization; timing-critical due to tight CPU wait-state constraints. Use Value: 30 mA active current and 100 µA standby current support battery-backed operation during standby without compromising boot reliability. |
| Test Equipment Microcode Repository | Avionics System Configuration Memory |
Use Scenario: Holding calibration microcode and test pattern tables in automated benchtop test systems requiring traceable, unalterable configuration data. IC Role / Device Role / Timing Role: Static memory resource accessed via GPIB or ISA bus interface; read-only during normal operation. Use Value: Electronic signature (20h/41h) enables automated programmer verification - ensuring correct device insertion before test system commissioning. | Use Scenario: Storing flight-critical configuration parameters in airborne data acquisition units subject to DO-254 design assurance level B. IC Role / Device Role / Timing Role: Radiation-tolerant (non-flash) non-volatile storage; accessed during pre-flight self-test with deterministic 35 ns access latency. Use Value: PDIP32 package provides mechanical robustness and thermal cycling stability superior to plastic TSOP variants in wide-temperature avionics enclosures. |
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 |
|---|---|---|---|
| AM27C4001-70DC | Same 4 Mbit ×8 organization, 35 ns access, but uses AMD's proprietary programming algorithm and electronic signature (01h/41h) | Requires AMD-specific programmer firmware; not recognized by ST-branded PRESTO II tools | Select only if existing toolchain is AMD-locked and cross-programmer validation is impractical |
| MX27C4001-70PC | Macronix variant with identical pinout and DC specs, but AC timing tolerance relaxed to 45 ns max (not 35 ns) | Not suitable for zero-wait-state 28.6 MHz CPU buses; introduces 10 ns timing margin loss | Acceptable only in systems with programmable wait-state generators or reduced clock rates |
Compared with AM27C4001-70DC and MX27C4001-70PC, the M27C4001-70C1 delivers guaranteed 35 ns access and native PRESTO II support - critical for legacy systems relying on ST-validated programming flows and strict timing closure.
Availability
M27C4001-70C1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM, test equipment microcode repository, and avionics system configuration memory requiring stable component supply across extended product lifecycles.
Supply support for M27C4001-70C1 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 analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The M27C4001 belongs to ST's legacy EPROM product line, engineered specifically for reliable, field-erasable firmware storage in microprocessor-based systems where flash memory was unavailable or unsuitable due to endurance or qualification constraints.
FAQ
Is M27C4001-70C1 UV-erasable?
No - the "-C1" suffix denotes the PDIP32 plastic package, which lacks a quartz window and is OTP-only. UV erasure applies solely to the FDIP32W (ceramic window) variant. This part retains programmed data permanently unless physically replaced.
What programming voltage is required for M27C4001-70C1?
The M27C4001-70C1 requires VPP = 12.75 V ±0.25 V during programming, with VCC concurrently held at 6.25 V ±0.25 V. These voltages must be applied in strict sequence: VCC before VPP, and removed VPP before VCC, per datasheet Section 2.5.
Can M27C4001-70C1 operate at 3.3V?
No - it is specified only for 5 V ±10% operation in read mode. The input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive levels (VOH = 2.4 V, VOL = 0.4 V) are TTL-compatible and incompatible with 3.3 V logic families without level translation.
Does M27C4001-70C1 support page or burst programming?
No - it uses byte-wise programming with 100 µs per word. The PRESTO II algorithm performs sequential single-byte pulses with margin-verify; no block, page, or burst programming modes are implemented or supported.
M27C4001-70C1 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:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 70 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 (11.35x13.89)
M27C4001-70C1 FAQ
1.How can I place an order for M27C4001-70C1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4001-70C1 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 M27C4001-70C1 reliable?
The price and inventory of M27C4001-70C1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-70C1 is usually 5 days.
3.What payment methods are accepted for M27C4001-70C1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-70C1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4001-70C1?
M27C4001-70C1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4001-70C1 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 M27C4001-70C1?
For technical support, including M27C4001-70C1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-70C1 requirements.
6.How does Aetrix verify that M27C4001-70C1 is sourced from the original manufacturer or authorized distributors?
All M27C4001-70C1 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 M27C4001-70C1 meets industry standards.
7.What is the process for return or replacement of M27C4001-70C1?
All M27C4001-70C1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-70C1, 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 M27C4001-70C1 part is unused and in its original packaging.
Return procedure for M27C4001-70C1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C4001-70C1 Tags
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