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Microchip Technology AT27C040-12JI
- Part No.:
- AT27C040-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C040-12JI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,778
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Product details
Overview
AT27C040-12JI from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM with 120 ns read access time, 5V ±10% single-supply operation, and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), CMOS/TTL-compatible I/O, and rapid programming at 100 µs/byte - enabling direct integration into legacy microprocessor systems requiring non-volatile program storage without wait states.
For engineers reviewing the AT27C040-12JI datasheet, AT27C040-12JI pinout, AT27C040-12JI application, or AT27C040-12JI equivalent, this page delivers verified package mapping (32-lead PLCC), JEDEC-standard timing parameters, OTP reliability data, VPP programming voltage requirements, and real-world use cases in embedded boot memory and firmware storage.
Technical Context
The AT27C040-12JI implements a standard OTP EPROM architecture with address decoding for A0–A18 (19-bit addressing), 8-bit parallel data outputs (O0–O7), and two active-low control lines: Chip Enable (CE) and Output Enable (OE). Its read cycle relies on asynchronous address-to-output propagation with tACC = 120 ns max under industrial conditions.
Programming requires elevated VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a 100 µs CE pulse width per byte and integrated product identification via A9 high-voltage sensing (11.5–12.5 V). The device uses Atmel's scaled CMOS process to achieve 100 µA max standby current and 30 mA max active current at 5 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8) - supports full 19-bit address space for boot code or firmware image storage |
| Read Access Time | 120 ns max - eliminates WAIT states in 80Cxx/68K-based systems running ≤8.3 MHz |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary supplies required |
| Standby Current | 100 µA max - enables low-power retention in always-on industrial controllers |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated programmer HV supply; not compatible with 5V-only programmers |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including motor drives and PLCs |
| ESD Protection | 2000V HBM - ensures robust handling during board assembly and field replacement |
Pinout & Package
AT27C040-12JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE, with pin 1 marked by corner notch. The package is surface-mount compatible and designed for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; A0 = LSB, A18 = MSB; all must be stable before CE/OE assertion |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE is high |
| CE | Chip Enable | Active-low global enable; controls device selection and power state transition between standby and active |
| OE | Output Enable | Active-low output gate; allows shared bus operation without external tri-state logic |
| VPP | Programming Voltage | 13 V input during programming only; must be applied after VCC and removed before VCC |
| VCC | Power Supply | +5V supply; powers core logic and I/O buffers; requires local 0.1 µF ceramic decoupling |
| GND | Ground | Reference return path for VCC and VPP; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces production burn-in time vs. conventional EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x0B) readable via A9 = 12 V and A0 toggle - enables automated programmer validation |
| Dual-Line Control (CE/OE) | Eliminates bus contention in multi-device systems - supports clean read cycles without external arbitration logic |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2000 V ESD protection - meets industrial handling and long-term field reliability requirements |
| JEDEC-Standard Packages | 32J (PLCC), 32P6 (PDIP), 32T (TSOP) - ensures drop-in compatibility across legacy PCB footprints |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic firmware in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 120 ns read access to initialization code upon power-up. Use Value: Eliminates need for external wait-state generation, enabling direct interface with 80C188EB or Z80-based CPU buses. |
Use Scenario: Holding immutable BIOS or monitor code in vintage embedded systems such as test equipment or medical analyzers. IC Role / Device Role / Timing Role: OTP EPROM serving as primary instruction store; accessed via standard address/data bus with CE/OE handshaking. Use Value: Guarantees firmware integrity over 10+ years with no risk of accidental overwrite or corruption. |
| Automated Test Equipment (ATE) Pattern Memory | Avionics System Configuration ROM |
Use Scenario: Storing fixed digital stimulus patterns in boundary-scan or functional test platforms operating in controlled lab environments. IC Role / Device Role / Timing Role: Static pattern repository accessed synchronously during test sequence execution. Use Value: Delivers consistent 120 ns access latency across temperature extremes, ensuring repeatable test timing margins. |
Use Scenario: Holding aircraft-specific configuration tables and calibration constants in certified avionics modules requiring DO-254 compliance. IC Role / Device Role / Timing Role: Read-only configuration memory mapped into processor address space during system initialization. Use Value: Industrial temperature rating and 2000 V ESD protection support ruggedized deployment in airborne electronics enclosures. |
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; requires VPP = 12.5 V ±0.5 V (not 13.0 V) | Compatible in systems with adjustable VPP programming supplies; not validated for Atmel's Rapid™ algorithm | Select if existing AMD-programmer infrastructure is in place and VPP tolerance allows 12.5 V operation |
| MX27C4001-12PC | Macronix variant with identical pinout and AC specs; standby current rated at 200 µA (vs. 100 µA for AT27C040-12JI) | Suitable for cost-sensitive industrial designs where 100 µA standby is not mandatory | Choose when BOM consolidation across multiple suppliers is prioritized over lowest quiescent current |
Compared with AM27C040-12DC and MX27C4001-12PC, the AT27C040-12JI offers tighter standby current (100 µA), guaranteed Rapid™ programming compatibility, and Atmel-specific product ID coding - making it optimal for new designs requiring verified firmware integrity and minimal power in always-on systems.
Availability
AT27C040-12JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automated test equipment pattern memory requiring stable component supply and long-lifecycle support.
Supply support for AT27C040-12JI 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, non-volatile memory, and analog products before its acquisition by Microchip Technology in 2016.
The AT27C040-12JI belongs to Atmel's OTP EPROM product line, engineered for reliable, low-power, high-speed program storage in industrial and embedded systems where firmware immutability and long-term data retention are critical.
FAQ
What is the maximum operating temperature range for the AT27C040-12JI?
The AT27C040-12JI 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), and applies specifically to the -JI suffix variant. The AT27C040-12JI maintains full read timing compliance (tACC ≤ 120 ns) and electrical specifications across this entire range.
Does the AT27C040-12JI require a separate programming voltage, and what is its value?
Yes, the AT27C040-12JI requires VPP = 13.0 V ±0.25 V during programming, as specified in the DC Programming Characteristics table. This voltage must be applied after VCC and removed before VCC to prevent damage. The AT27C040-12JI does not support 5V-only programming - standard EPROM programmers with adjustable VPP capability are required.
Is the AT27C040-12JI pin-compatible with other 32-lead EPROMs like the 27C040 family?
The AT27C040-12JI shares the same 32-pin PLCC (32J), PDIP (32P6), and TSOP (32T) footprints and pin functions (A0–A18, O0–O7, CE, OE, VPP, VCC, GND) with industry-standard 4-Mbit EPROMs. However, VPP voltage and programming algorithms differ - direct substitution requires verification of programmer compatibility and timing margin analysis.
What is the purpose of the Integrated Product Identification Code in the AT27C040-12JI?
The AT27C040-12JI includes an electronic ID code accessible by applying 12 V to A9 and toggling A0: Manufacturer ID = 0x1E, Device Code = 0x0B. This feature allows automated programming equipment to validate part identity and select correct algorithms - a key reliability safeguard during high-volume firmware burning operations using the AT27C040-12JI.
Can the AT27C040-12JI be used in a 5V-only system without programming hardware?
Yes - in read-only operation, the AT27C040-12JI functions with a single 5V ±10% supply and requires no VPP connection. All control (CE/OE) and data (O0–O7) signals are CMOS/TTL-compatible. The AT27C040-12JI draws only 100 µA in standby and 30 mA active, making it suitable for permanent installation in 5V systems where firmware is pre-programmed off-line.
AT27C040-12JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C040-12JI FAQ
1.How can I place an order for AT27C040-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-12JI 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 AT27C040-12JI reliable?
The price and inventory of AT27C040-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-12JI is usually 5 days.
3.What payment methods are accepted for AT27C040-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-12JI?
AT27C040-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-12JI 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 AT27C040-12JI?
For technical support, including AT27C040-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-12JI requirements.
6.How does Aetrix verify that AT27C040-12JI is sourced from the original manufacturer or authorized distributors?
All AT27C040-12JI 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 AT27C040-12JI meets industry standards.
7.What is the process for return or replacement of AT27C040-12JI?
All AT27C040-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-12JI, 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 AT27C040-12JI part is unused and in its original packaging.
Return procedure for AT27C040-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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