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Microchip Technology AT27C040-12RC
- Part No.:
- AT27C040-12RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-SOIC (0.445", 11.30mm Width)
- Datasheet:
-
AT27C040-12RC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
AT27C040-12RC from Microchip Technology (formerly Atmel) is a 4-Mbit one-time programmable EPROM organized as 512K × 8 bits, operating from a single 5V ±10% supply with 120 ns maximum read access time, 100 µA max standby current, and JEDEC-standard 32-lead SOIC (0.450") package. It serves as nonvolatile program storage in legacy microprocessor systems requiring reliable boot code retention without reprogramming capability.
For engineers reviewing the AT27C040-12RC datasheet, AT27C040-12RC pinout, AT27C040-12RC application, or AT27C040-12RC equivalent, key selection criteria include verified 120 ns read timing, CMOS/TTL I/O compatibility, Rapid™ programming algorithm (100 µs/byte), integrated product identification code, and industrial temperature range support (-40°C to +85°C).
Technical Context
The AT27C040-12RC implements a two-line control architecture using Chip Enable (CE) and Output Enable (OE) to eliminate bus contention in high-speed systems. Its scaled CMOS process delivers low active power (30 mA at 5 MHz) and high reliability features including 2000V ESD protection and 200 mA latchup immunity.
Programming requires VPP = 13.0V ±0.25V and VCC = 6.5V ±0.25V, with a 100 µs CE pulse width per byte and verification/reprogramming loop up to 10 pulses per failed location. Product identification is accessed by setting A9 to 12.0V and toggling A0 while holding all other address lines low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304-bit (512K × 8) OTP EPROM - fixed boot firmware storage with no erase capability |
| Read Access Time | 120 ns max - supports wait-state-free operation on 8 MHz Z80 or 10 MHz 8086-class processors |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Standby Current | 100 µA max - enables low-power hold mode in battery-backed or energy-sensitive systems |
| Operating Temp | -40°C to +85°C - qualified for industrial environments including factory automation and telecom infrastructure |
| Programming Voltage | VPP = 13.0V ±0.25V - requires dedicated programming hardware with controlled voltage ramp and decoupling |
| I/O Compatibility | CMOS and TTL - interoperable with legacy microcontrollers, FPGAs, and ASICs without level-shifting |
Pinout & Package
AT27C040-12RC is supplied in a 32-lead plastic gull-wing small outline integrated circuit (SOIC) package, 0.450" wide, JEDEC MS-012AC compliant, with 1.27 mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus accepting 512K unique locations; A9 used for product ID selection when driven to 12V |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance during standby or output disable |
| CE | Chip Enable | Active-low global enable controlling device selection on shared memory bus |
| OE | Output Enable | Active-low output gate enabling data drive only when CE is also asserted |
| VCC | Power Supply | +5V ±10% main supply; must be applied before/removed after VPP during programming |
| VPP | Programming Voltage | +13.0V ±0.25V input required only during programming; internally isolated during read mode |
| GND | Ground | Reference return path for VCC and VPP; requires local 0.1 µF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time reduces production burn-in cycle duration by >90% vs. conventional EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x0B) accessible via A9/VH and A0 toggle - enables automated programmer validation |
| Two-Line Control (CE/OE) | Eliminates bus contention in multi-device memory maps without external gating logic or timing delays |
| High-Reliability CMOS Process | 2000V HBM ESD rating and 200 mA latchup immunity ensure robustness in manufacturing and field deployment |
| Industrial Temperature Range | Guaranteed functionality from -40°C to +85°C supports deployment in uncontrolled enclosures and outdoor equipment |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Line Card Boot ROM |
|---|---|
Use Scenario: Storing fixed firmware for programmable logic controllers in factory-floor automation cabinets exposed to vibration and wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot code memory providing deterministic startup sequence with no runtime reconfiguration. Use Value: 120 ns access time ensures zero-wait-state execution on 80C188-based control CPUs; industrial temp rating eliminates thermal derating. | Use Scenario: Holding initialization code and diagnostic routines on T1/E1 line interface cards in central office switching systems. IC Role / Device Role / Timing Role: Read-only instruction store mapped into processor address space during power-on reset. Use Value: CMOS/TTL compatibility allows direct connection to 74ACT logic families; 100 µA standby current minimizes board-level leakage in always-on modules. |
| Medical Imaging System BIOS | Military Vehicle Display Controller |
Use Scenario: Storing calibration tables and safety-critical boot firmware in portable ultrasound and X-ray console subsystems. IC Role / Device Role / Timing Role: Immutable configuration memory ensuring regulatory-compliant boot integrity across device lifecycle. Use Value: OTP architecture prevents accidental or malicious firmware modification; 2000V ESD protection withstands handling in clinical environments. | Use Scenario: Providing mission-critical display initialization code in armored vehicle command-and-control panels subject to shock and EMI. IC Role / Device Role / Timing Role: Fixed-function ROM delivering deterministic video controller setup prior to FPGA configuration. Use Value: 200 mA latchup immunity maintains operation under transient rail disturbances; SOIC package supports conformal coating for moisture resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-12JC | Same die, 32-lead PLCC package; 0°C to +70°C commercial temp range | Limited to climate-controlled lab or benchtop equipment; no extended temp qualification | Select when PLCC socketing is required and ambient temperature remains within commercial range |
| AT27C040-12PC | Same die, 32-lead PDIP package; 0°C to +70°C commercial temp range | Through-hole mounting only; higher profile and lower thermal performance than SOIC | Select for prototyping, repair, or legacy PCBs designed for DIP footprints |
Compared with AT27C040-12JC and AT27C040-12PC, the AT27C040-12RC offers industrial temperature support and surface-mount SOIC packaging-critical for automated assembly and harsh-environment deployments where thermal stability and board space efficiency are mandatory.
Availability
AT27C040-12RC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy telecom line card boot ROM, and medical imaging system BIOS requiring stable component supply and long-term obsolescence management.
Supply support for AT27C040-12RC 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
Microchip Technology acquired Atmel in 2016 and continues to manufacture, qualify, and support legacy Atmel memory products including the AT27C040 family.
The AT27C040 series was designed as a drop-in replacement for UV-erasable EPROMs in cost-sensitive, high-reliability embedded systems where firmware immutability and long-term data retention are essential.
FAQ
What is the maximum read access time specified for AT27C040-12RC?
The AT27C040-12RC has a maximum read access time of 120 ns under industrial temperature conditions (-40°C to +85°C) and 5V ±10% supply. This value is guaranteed across the full operating range and enables wait-state-free interfacing with microprocessors running up to 8.3 MHz. The "12" in the part number directly denotes this 120 ns speed grade, distinguishing it from -70, -90, and -15 variants of the AT27C040-12RC.
Does AT27C040-12RC support in-system programming?
No, the AT27C040-12RC does not support in-system programming. It requires external EPROM programmers capable of applying 13.0V to the VPP pin and sequencing VCC/VPP correctly. Programming must occur off-board with proper decoupling (0.1 µF capacitor between VPP and GND), and the device cannot be reprogrammed once written. The AT27C040-12RC is strictly one-time programmable and lacks internal charge pumps or serial interfaces for field updates.
What package type is used for AT27C040-12RC?
The AT27C040-12RC uses a 32-lead plastic gull-wing small outline integrated circuit (SOIC) package, 0.450" wide, designated as package code "32R" per Atmel's ordering information. This surface-mount package has 1.27 mm lead pitch, conforms to JEDEC MS-012AC, and is compatible with standard reflow soldering profiles. It differs from the PDIP ("32P6"), PLCC ("32J"), and TSOP ("32T") variants of the AT27C040-12RC.
How is the product identification code accessed on AT27C040-12RC?
The product identification code on AT27C040-12RC is accessed by driving A9 to 12.0V ±0.5V (VID), holding A1–A18 low, and toggling A0 between low and high states while keeping CE and OE low. This returns Manufacturer ID 0x1E on O7–O0 for A0 = low, and Device Code 0x0B for A0 = high. The AT27C040-12RC requires precise voltage control on A9 and is incompatible with standard 5V-only programmers unless they support this special identification mode.
Can AT27C040-12RC operate from a 3.3V supply?
No, the AT27C040-12RC is not rated for 3.3V operation. Its absolute minimum VCC is 4.5V and maximum is 5.5V per the 5V ±10% specification. Attempting to power the AT27C040-12RC from 3.3V will result in undefined read behavior, failure to meet timing specifications, and potential inability to recognize CE/OE control signals. Level translation or a dedicated 5V rail is required when interfacing with 3.3V microcontrollers or FPGAs.
AT27C040-12RC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-SOIC (0.445", 11.30mm Width)
- 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-SOIC
AT27C040-12RC FAQ
1.How can I place an order for AT27C040-12RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-12RC 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 AT27C040-12RC reliable?
The price and inventory of AT27C040-12RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-12RC is usually 5 days.
3.What payment methods are accepted for AT27C040-12RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-12RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-12RC?
AT27C040-12RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-12RC 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 AT27C040-12RC?
For technical support, including AT27C040-12RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-12RC requirements.
6.How does Aetrix verify that AT27C040-12RC is sourced from the original manufacturer or authorized distributors?
All AT27C040-12RC 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 AT27C040-12RC meets industry standards.
7.What is the process for return or replacement of AT27C040-12RC?
All AT27C040-12RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-12RC, 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 AT27C040-12RC part is unused and in its original packaging.
Return procedure for AT27C040-12RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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