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STMicroelectronics M27C4001-70C6
- Part No.:
- M27C4001-70C6
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
M27C4001-70C6.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,764
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Product details
Overview
M27C4001-70C6 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in PDIP32 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 M27C4001-70C6 datasheet, M27C4001-70C6 pinout, M27C4001-70C6 application, or M27C4001-70C6 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 for lead-free manufacturing.
Technical Context
The M27C4001-70C6 implements TTL-compatible address/data interface with two independent enable controls: Chip Enable (E) for power gating and Output Enable (G) for output bus isolation. Its read mode requires both E and G low to drive Q0–Q7 outputs, enabling conflict-free memory expansion in multi-chip arrays.
Programming uses PRESTO II algorithm with 100 µs/word pulses at VPP = 12.75 V and VCC = 6.25 V, while electronic signature verification reads Manufacturer Code 20h and Device Code 41h via A9 high-voltage activation and A0 toggling - confirming device identity before programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (524,288 × 8 bits); supports full 19-bit address space (A0–A18) for boot code or firmware storage |
| Access Time | 35 ns max (tAVQV); ensures compatibility with 25 MHz Z80, 8086, and 68000-based systems |
| Supply Voltage (Read) | 5 V ±10%; operates across industrial voltage tolerances without external regulation |
| Standby Current | 100 µA (CMOS E high); reduces system power by >99% vs active mode in idle states |
| Programming Voltage | VPP = 12.75 V ±0.25 V; requires dedicated HV supply rail, not derived from VCC |
| UV Erase Dose | ≥15 W·sec/cm² at 2537 Å; achieves full bit reset in 15–20 min under calibrated UV lamp |
| Operating Temp | 0 °C to 70 °C (Commercial grade); validated for stable timing across ambient board temperatures |
Pinout & Package
Packaged in 32-pin Plastic Dual In-line Package (PDIP32, suffix "B"), 600 mil width, ECOPACK®-compliant and lead-free per JEDEC JESD97.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; latched on E low transition during read or program |
| Q0–Q7 | Data Outputs / Inputs | Bidirectional 8-bit data path: outputs during read/verify, inputs during programming |
| E | Chip Enable | Active-low primary selection signal; places device in standby (Hi-Z outputs) when high |
| G | Output Enable | Active-low secondary control; gates Q0–Q7 only when E is also low |
| VPP | Programming Supply | 12.75 V input required only during programming/verify; must be applied after VCC |
| VCC | Power Supply | 5 V for read mode; 6.25 V for programming - separate voltage setting required |
| VSS | Ground | Reference return for all I/O and power pins; decoupling capacitor must connect here |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line output control (E + G) | Eliminates bus contention in multi-device memory maps; enables per-chip power gating |
| PRESTO II programming algorithm | Guarantees margin-safe programming in ≤52.5 s without over-programming or verify retries |
| Electronic signature (20h/41h) | Enables automatic device recognition in programmers - prevents mismatched algorithms |
| ECOPACK® compliance | Lead-free construction with JEDEC JESD97 marking; meets RoHS and WEEE directives |
| UV erasability (FDIP32W variant) | Windowed ceramic package allows up to 100 erase/program cycles; PDIP32 is OTP-only |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Line Card Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; accessed during cold start and watchdog reset. Use Value: UV-erasable version allows field firmware updates via quartz lamp; 35 ns access satisfies 80C186 timing budgets. |
Use Scenario: Holding initialization code and protocol stacks for T1/E1 framing ICs in central office equipment. IC Role / Device Role / Timing Role: Read-only instruction store executing directly from address lines A0–A18; synchronized to 4 MHz clock domain. Use Value: Dual enable (E/G) prevents bus conflicts during hot-swap of line cards; 100 µA standby cuts backplane leakage. |
| Embedded Instrumentation Calibration Data | Avionics Maintenance Diagnostic Module |
Use Scenario: Retaining sensor calibration coefficients and linearization tables in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Static data repository accessed once per measurement cycle; no write operations in field use. Use Value: OTP variants (PDIP32/PLCC32) ensure tamper-proof calibration integrity; ECOPACK® supports reflow soldering. |
Use Scenario: Storing built-in test (BIT) routines and fault signature libraries in airborne maintenance terminals. IC Role / Device Role / Timing Role: Memory-mapped diagnostic engine executed during pre-flight checks; isolated via E control during normal operation. Use Value: 12.75 V VPP tolerance accommodates aging power supplies in legacy avionics bays; 0–70 °C rating matches cabin environment. |
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 organization, 35 ns access, but AMD-branded; VPP = 12.5 V ±0.5 V (wider tolerance) | Compatible pinout and timing; requires updated programmer voltage profile for VPP | Select if sourcing from AMD-authorized channels or needing broader VPP margin in aging test fixtures |
| MX27C4001-70PC | Macronix variant; identical AC/DC specs but different electronic signature (27h/41h) and UV erase sensitivity | Valid drop-in for read operations; UV erasure requires 20–25 min due to higher photon absorption threshold | Prefer for cost-sensitive industrial builds where erase cycle count is low and programmer supports signature detection |
Compared with AM27C4001-70DC and MX27C4001-70PC, the M27C4001-70C6 offers tighter VPP regulation (±0.25 V), guaranteed PRESTO II support, and ST-specific signature codes - making it optimal for systems using ST-certified programming hardware and requiring repeatable margin-safe programming.
Availability
M27C4001-70C6 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy telecom line card boot ROM, and embedded instrumentation calibration data requiring stable component supply across long-lifecycle programs.
Supply support for M27C4001-70C6 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing capability.
The M27C4001 belongs to ST's legacy EPROM product line, designed specifically for reliable, field-upgradable firmware storage in microprocessor-based systems where flash memory was not yet mature or qualified.
FAQ
Is M27C4001-70C6 UV-erasable?
No - the "C6" suffix denotes the PDIP32 (plastic) package, which is one-time programmable (OTP). Only the FDIP32W (windowed ceramic) variant supports UV erasure. This part retains programmed data permanently unless physically destroyed.
What is the correct power sequencing for programming?
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 sequencing risks incomplete programming or cell damage.
Can M27C4001-70C6 operate at 3.3 V?
No - it is specified only for 5 V ±10% in read mode and 6.25 V ±0.25 V in programming mode. Input thresholds (VIH = 2 V, VIL = 0.8 V) are TTL-compatible, but core logic requires 5 V operation; 3.3 V will cause read failures or undefined outputs.
Does M27C4001-70C6 support common bus sharing with other memory devices?
Yes - its two-line control (E and G) enables clean bus arbitration. When E is high, outputs go Hi-Z regardless of G state, allowing multiple devices to share Q0–Q7 without contention - essential for dense memory expansions in 8086/80286 systems.
M27C4001-70C6 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (11.35x13.89)
M27C4001-70C6 FAQ
1.How can I place an order for M27C4001-70C6 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4001-70C6 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 M27C4001-70C6 reliable?
The price and inventory of M27C4001-70C6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-70C6 is usually 5 days.
3.What payment methods are accepted for M27C4001-70C6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-70C6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4001-70C6?
M27C4001-70C6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4001-70C6 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 M27C4001-70C6?
For technical support, including M27C4001-70C6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-70C6 requirements.
6.How does Aetrix verify that M27C4001-70C6 is sourced from the original manufacturer or authorized distributors?
All M27C4001-70C6 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 M27C4001-70C6 meets industry standards.
7.What is the process for return or replacement of M27C4001-70C6?
All M27C4001-70C6 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-70C6, 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 M27C4001-70C6 part is unused and in its original packaging.
Return procedure for M27C4001-70C6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C4001-70C6 Tags
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