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Microchip Technology AT27C040-12JC
- Part No.:
- AT27C040-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C040-12JC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,649
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Product details
Overview
AT27C040-12JC from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM with 120 ns read access time, 5V ±10% supply, and CMOS/TTL-compatible I/O. It operates across 0°C to 70°C, supports rapid programming at 100 µs/byte, and features dual-line control (CE/OE) for bus contention avoidance in microprocessor systems.
For engineers reviewing the AT27C040-12JC datasheet, AT27C040-12JC pinout, AT27C040-12JC application, or AT27C040-12JC equivalent, key selection criteria include verified 120 ns tACC timing, PLCC-32 package compatibility, VPP = 12.0 V ±0.5 V programming voltage, industrial-grade ESD/latchup immunity, and integrated product identification code support.
Technical Context
The AT27C040-12JC implements a standard OTP EPROM architecture with address decoding for A0–A18 (19-bit), 8-bit parallel data outputs O0–O7, and two active-low control lines (CE, OE). Its Rapid™ programming algorithm uses precise 100 µs CE pulses at VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V to achieve byte-level programming with verification loops.
It delivers low-power operation: ≤100 µA standby current (CMOS mode), ≤30 mA active current at 5 MHz, and integrates 2000V HBM ESD protection plus 200 mA latchup immunity. The device supports product identification via A9 = 12.0 V and A0 toggling to output manufacturer (0x1E) and device (0x0B) codes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8) - supports full 19-bit addressing for legacy 8-bit microprocessor boot ROMs. |
| Read Access Time (tACC) | 120 ns max - enables direct interface with 8-MHz Z80, 68K, or 8051 systems without WAIT states. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode. |
| Programming Voltage (VPP) | 13.0 V ±0.25 V - requires dedicated high-voltage programming circuitry; not used during normal read operation. |
| Standby Current (ISB1) | 100 µA max (CMOS CE mode) - reduces system power budget in idle states of embedded controllers. |
| ESD Protection | 2000V HBM - meets JEDEC JESD22-A114 reliability requirements for handling and board assembly. |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage or ground bounce conditions. |
Pinout & Package
AT27C040-12JC is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE. Pin 1 is marked by a corner notch; body dimensions are 12.5 mm × 12.5 mm × 3.5 mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decoded internally to select one of 524,288 bytes. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE is inactive. |
| CE | Chip Enable | Active-low global enable; must be low for read or program access; controls power state transition. |
| OE | Output Enable | Active-low output gate; allows shared bus operation by disabling outputs without disabling chip. |
| VPP | Programming Voltage | 13.0 V input during programming only; must be applied after VCC and removed before VCC. |
| VCC | Power Supply | +5V main supply; powers logic and memory array; must be stable within ±10% during all 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 with automatic verify-and-reprogram loop up to 10 pulses per byte. |
| Integrated Product Identification Code | Electronic ID accessible via A9 = 12.0 V and A0 toggle; returns 0x1E (Atmel) and 0x0B (AT27C040) for automated programmer recognition. |
| Dual-Line Control (CE/OE) | Eliminates bus contention in multi-device systems by enabling independent output gating and chip selection. |
| JEDEC-Standard PLCC Packaging | 32J footprint ensures mechanical and solder-reflow compatibility with legacy EPROM sockets and rework tools. |
| High-Reliability CMOS Process | 2000V ESD and 200 mA latchup immunity validated per JEDEC standards for production robustness. |
Applications
| Industrial Control Firmware Storage | Legacy Microprocessor Boot ROM |
|---|---|
Use Scenario: Storing fixed firmware for PLCs, motor drives, and CNC controllers operating in harsh environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot code storage with guaranteed 120 ns read access to meet real-time interrupt latency requirements. Use Value: Eliminates need for external WAIT-state generators and supports deterministic startup timing across -40°C to +85°C industrial range. | Use Scenario: Providing initial boot code for Z80, 68000, or 8086-based embedded systems where ROM size and speed constrain system initialization. IC Role / Device Role / Timing Role: Primary 512K × 8 read-only memory mapped at reset vector address space. Use Value: Enables single-cycle instruction fetch at 8-MHz clock rates without bus arbitration delays due to CE/OE dual-control architecture. |
| Automotive Instrument Cluster Memory | Medical Device Calibration Data Storage |
Use Scenario: Holding immutable calibration tables and display fonts in analog/digital instrument clusters requiring long-term data retention. IC Role / Device Role / Timing Role: OTP storage for safety-critical static data; programmed once during final test and sealed permanently. Use Value: Guarantees data integrity over 10+ years with no risk of accidental overwrite or bit corruption from power loss. | Use Scenario: Storing factory-calibrated sensor offsets and linearization coefficients in Class II medical devices subject to FDA design controls. IC Role / Device Role / Timing Role: Secure, tamper-proof nonvolatile memory for regulatory-compliant configuration data. Use Value: Meets IEC 62304 traceability requirements via integrated product ID code and JEDEC-standard programming verification. |
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 capacity and 120 ns access, but uses AMD's process; higher ISB2 standby current (1 mA vs. 100 µA). | Less suitable for battery-backed or ultra-low-power standby modes; identical PLCC-32 footprint. | Select AM27C040-12DC only if existing AMD-programmer infrastructure is in place and standby current is not critical. |
| MX27C4001-12PC | Macronix variant with same 512K × 8 organization and 120 ns rating; requires VPP = 12.5 V ±0.25 V (slightly tighter tolerance). | Compatible in read mode; minor VPP setup timing differences may require minor programmer firmware update. | Choose MX27C4001-12PC when seeking second-source availability with identical AC timing and JEDEC PLCC-32 packaging. |
Compared with AM27C040-12DC and MX27C4001-12PC, the AT27C040-12JC offers superior standby efficiency (100 µA vs. 1 mA), guaranteed Rapid™ programming compatibility, and built-in ID code support-making it optimal for cost-sensitive, high-volume industrial boot ROM designs requiring field-programmable flexibility and long-term supply stability.
Availability
AT27C040-12JC is available at Aetrix Electronics and suitable for industrial control firmware storage, legacy microprocessor boot ROM, and automotive instrument cluster memory requiring stable component supply across extended lifecycle programs.
Supply support for AT27C040-12JC 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 RF solutions before its acquisition by Microchip Technology in 2016.
The AT27C040-12JC belongs to Atmel's OTP EPROM product line, designed specifically for cost-effective, high-reliability boot code and firmware storage in 8-bit and 16-bit embedded systems where reprogrammability is unnecessary after manufacturing.
FAQ
What is the maximum allowable VPP voltage for programming the AT27C040-12JC?
The AT27C040-12JC requires VPP = 13.0 V ±0.25 V during programming, with absolute maximum rating of +14.0 V. Exceeding 13.25 V risks oxide damage and reduced data retention. The AT27C040-12JC datasheet specifies VID (A9 identification voltage) at 11.5–12.5 V, confirming strict voltage window control is essential for both programming and ID code access.
Does the AT27C040-12JC support read operations at 3.3V logic levels?
No, the AT27C040-12JC is strictly a 5V ±10% device: VIH minimum is 2.0 V and VOH minimum is 2.4 V at IOH = −400 µA, but it lacks 3.3V-tolerant inputs or outputs. Interfacing with 3.3V microcontrollers requires level-shifting circuitry; the AT27C040-12JC itself draws VCC only from a 4.5–5.5V rail and does not support mixed-voltage operation.
How many times can the AT27C040-12JC be programmed?
The AT27C040-12JC is a one-time programmable (OTP) EPROM: each memory cell can be programmed only once. The Rapid™ algorithm verifies each byte after programming and permits up to 10 pulses per location-but failure to verify after 10 attempts renders that byte permanently unreadable. The AT27C040-12JC cannot be erased or reprogrammed; UV erasure is not supported.
What decoupling capacitance is required for stable operation of the AT27C040-12JC?
Each AT27C040-12JC requires a 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close to the pins as possible. For boards with multiple AT27C040-12JC devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point to suppress low-frequency ripple and maintain VCC stability during CE transitions.
Is the AT27C040-12JC pin-compatible with other 32-lead EPROMs like the 27C4001?
Yes-the AT27C040-12JC uses standard JEDEC 32-lead PLCC pinout (32J), matching the 27C4001, 27C040, and AM27C040 families. Address (A0–A18), data (O0–O7), CE, OE, VCC, GND, and VPP assignments are functionally identical. However, programming voltage (VPP = 13.0 V) and timing tolerances differ, so system-level compatibility requires validation of programmer settings-not just pin mapping.
AT27C040-12JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C040-12JC FAQ
1.How can I place an order for AT27C040-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-12JC 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 AT27C040-12JC reliable?
The price and inventory of AT27C040-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-12JC is usually 5 days.
3.What payment methods are accepted for AT27C040-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-12JC?
AT27C040-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-12JC 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 AT27C040-12JC?
For technical support, including AT27C040-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-12JC requirements.
6.How does Aetrix verify that AT27C040-12JC is sourced from the original manufacturer or authorized distributors?
All AT27C040-12JC 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 AT27C040-12JC meets industry standards.
7.What is the process for return or replacement of AT27C040-12JC?
All AT27C040-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-12JC, 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 AT27C040-12JC part is unused and in its original packaging.
Return procedure for AT27C040-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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