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Microchip Technology AT27C040-12PC
- Part No.:
- AT27C040-12PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C040-12PC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,464
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Product details
Overview
AT27C040-12PC from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM with 120 ns read access time, 5V ±10% supply operation, and JEDEC-standard 32-lead PDIP packaging. It delivers CMOS/TTL-compatible I/O, 100 µA max standby current, and rapid 100 µs/byte programming for embedded firmware storage in microprocessor systems.
For engineers reviewing the AT27C040-12PC datasheet, AT27C040-12PC pinout, AT27C040-12PC application, or AT27C040-12PC equivalent, key selection criteria include read timing (tACC = 120 ns), VPP programming voltage (12.0 V ±0.5 V), industrial temperature range (-40°C to +85°C), and OTP reliability for legacy boot code storage.
Technical Context
The AT27C040-12PC implements a two-line control architecture using CE and OE to manage bus contention during high-speed reads. Its internal address decoding supports full 19-bit addressing (A0–A18) for 512K-byte access without external latching.
Programming relies on a dedicated VPP pin (12.0 V ±0.5 V) and Rapid™ algorithm with 100 µs CE pulse width; verification occurs per byte with up to 10 reprogramming attempts before failure declaration. Product identification uses A9 high-voltage sensing (11.5–12.5 V) and A0 toggling to select manufacturer (0x1E) or device code (0x0B).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8); supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 120 ns max (tACC); eliminates WAIT states in 8-MHz Z80 or 68K-based systems. |
| Supply Voltage | 5V ±10%; compatible with standard TTL/CMOS logic rails without regulation. |
| Standby Current | 100 µA max (ISB1); enables low-power retention in battery-backed systems. |
| Programming Voltage | VPP = 12.0 V ±0.5 V; requires dedicated high-voltage supply during programming only. |
| ESD Protection | 2000V HBM; ensures robust handling during manual PCB assembly and rework. |
| Latchup Immunity | 200 mA; prevents destructive latchup under transient overvoltage conditions. |
Pinout & Package
AT27C040-12PC is packaged in a 32-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-001 compliant, with 0.100" lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; selects one of 524,288 bytes for read or program operations. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs valid within 120 ns after CE/OE assertion in read mode. |
| CE | Chip Enable | Active-low chip select; controls device activation and enables rapid programming pulse timing. |
| OE | Output Enable | Active-low output gate; isolates data bus during standby or write cycles to prevent contention. |
| VPP | Programming Voltage | 12.0 V ±0.5 V input; enables oxide breakdown for bit programming; must be applied after VCC. |
| VCC | Power Supply | +5V ±10% main supply; powers logic and memory array during read and program modes. |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling per device. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time reduces firmware update cycle duration by >90% vs. legacy EPROMs. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) enable automatic algorithm selection in universal programmers. |
| Two-Line Control (CE/OE) | Eliminates bus contention in multi-device systems by enabling independent output gating and chip selection. |
| CMOS/TTL Compatibility | Input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive (2.1 mA sink, -400 µA source) support mixed-logic designs. |
| High-Reliability Process | 2000V ESD protection and 200 mA latchup immunity ensure field reliability in industrial environments. |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
Use Scenario: Storing fixed control logic and calibration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings. IC Role / Device Role / Timing Role: OTP EPROM providing nonvolatile instruction storage for 8051 or 68HC11 microcontrollers during cold start and runtime execution. Use Value: 120 ns access time enables deterministic scan-cycle timing; industrial temp rating (-40°C to +85°C) ensures operation across ambient extremes. | Use Scenario: Holding immutable boot code and safety-critical initialization routines in pre-OBD-II engine control units where firmware updates are prohibited post-deployment. IC Role / Device Role / Timing Role: Read-only memory mapped at reset vector address; accessed during power-on self-test before RAM initialization. Use Value: One-time programmability prevents accidental corruption; 2000V ESD rating withstands service bay handling and probe contact. |
| Military Communications Equipment BIOS | Medical Diagnostic Instrument Bootloader |
Use Scenario: Securing trusted boot firmware in HF/VHF radio transceivers deployed in field environments subject to vibration, humidity, and EMI. IC Role / Device Role / Timing Role: Primary boot ROM executing hardware initialization and cryptographic key loading prior to OS load. Use Value: Rapid™ programming allows secure firmware burn-in during final test; latchup immunity prevents failure during ESD events in ruggedized enclosures. | Use Scenario: Hosting certified bootloader code in FDA-regulated imaging devices requiring traceable, unalterable startup sequences. IC Role / Device Role / Timing Role: Nonvolatile storage for verified firmware signature checks and watchdog configuration prior to application execution. Use Value: OTP architecture satisfies regulatory requirements for immutable firmware; 100 µA standby current supports battery backup during AC power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-12DC | Same 4-Mbit size and 120 ns speed, but AMD-manufactured with 13.0 V VPP requirement and 250 µA max standby current. | Higher VPP tolerance (13.0 V) suits legacy AMD-programmer ecosystems; less suitable for Atmel-specific ID-code readers. | Select when maintaining compatibility with existing AMD-based programming infrastructure. |
| MX27C4001-12PC | Macronix variant with identical pinout and 120 ns timing, but 12.5 V VPP and 150 µA max standby current. | Product ID code differs (0x1F/0x41); requires programmer firmware update for auto-detection. | Choose for cost-sensitive replacements where ID-code independence is acceptable. |
Compared with AM27C040-12DC and MX27C4001-12PC, the AT27C040-12PC offers lower standby current (100 µA vs. 250/150 µA) and native support for Atmel's integrated ID code (0x1E/0x0B), simplifying automated programming validation in production test.
Availability
AT27C040-12PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot ROM, and military communications equipment BIOS requiring stable component supply across extended product lifecycles.
Supply support for AT27C040-12PC 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
Atmel Corporation was a U.S.-based semiconductor company specializing in microcontrollers, nonvolatile memory, and analog products before its acquisition by Microchip Technology in 2016.
The AT27C040-12PC belongs to Atmel's OTP EPROM product line, designed specifically for reliable, low-power, high-speed firmware storage in legacy and long-lifecycle embedded systems where field updates are unnecessary.
FAQ
What is the maximum operating temperature range for the AT27C040-12PC?
The AT27C040-12PC is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table and DC Operating Conditions section of the official Atmel datasheet (0189F–EPROM–4/03). The device maintains full read timing compliance (tACC ≤ 120 ns) and electrical parameters across this full range, making it suitable for deployment in harsh environmental conditions without thermal derating.
Does the AT27C040-12PC require a separate programming voltage during normal read operation?
No, the AT27C040-12PC operates from a single 5V ±10% supply (VCC) during normal read mode. The VPP pin is only required during programming and must be set to 12.0 V ±0.5 V. During read operation, VPP may be tied to VCC or left unconnected depending on system design, but it draws no current and has no functional role in read access. This simplifies power design for host systems that only perform read operations.
How many address lines does the AT27C040-12PC support, and what memory organization do they enable?
The AT27C040-12PC supports 19 address lines (A0–A18), enabling direct access to its full 512K × 8-bit (4-Mbit) memory array. Each unique 19-bit address selects one 8-bit byte, allowing linear mapping into microprocessor address spaces without banking or external address multiplexing. This matches standard 8-bit bus architectures such as the Intel 8085 or Motorola 6800 families.
What is the purpose of the Integrated Product Identification Code in the AT27C040-12PC?
The Integrated Product Identification Code in the AT27C040-12PC provides two electronically readable bytes: Manufacturer ID (0x1E) and Device Code (0x0B). These are accessed by setting A9 to 11.5–12.5 V and toggling A0 while holding all other address lines low. This feature allows universal programmers to auto-detect the AT27C040-12PC and select correct programming algorithms and voltage profiles without manual part selection.
Can the AT27C040-12PC be used as a drop-in replacement for the AT27C040-12JC or AT27C040-12TC?
No, the AT27C040-12PC is not a drop-in replacement for the AT27C040-12JC (PLCC) or AT27C040-12TC (TSOP) due to incompatible packages: PDIP (32P6), PLCC (32J), and TSOP (32T) have different footprints, lead forms, and mounting methods. While electrical specifications and pin functions are identical across all three variants, PCB layout changes are required to substitute between them. The "PC" suffix explicitly denotes the PDIP package.
AT27C040-12PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT27C040-12PC FAQ
1.How can I place an order for AT27C040-12PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-12PC 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 AT27C040-12PC reliable?
The price and inventory of AT27C040-12PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-12PC is usually 5 days.
3.What payment methods are accepted for AT27C040-12PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-12PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-12PC?
AT27C040-12PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-12PC 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 AT27C040-12PC?
For technical support, including AT27C040-12PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-12PC requirements.
6.How does Aetrix verify that AT27C040-12PC is sourced from the original manufacturer or authorized distributors?
All AT27C040-12PC 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 AT27C040-12PC meets industry standards.
7.What is the process for return or replacement of AT27C040-12PC?
All AT27C040-12PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-12PC, 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 AT27C040-12PC part is unused and in its original packaging.
Return procedure for AT27C040-12PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C040-12PC Tags
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