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Microchip Technology AT27C512R-15JI
- Part No.:
- AT27C512R-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-15JI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,561
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Product details
Overview
AT27C512R-15JI from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 150 ns maximum access time, 5V ±10% single-supply operation, and industrial temperature range (–40°C to +85°C). It features CMOS/TTL-compatible I/O, dual-line control (CE/OE), and rapid programming at 100 µs/byte - enabling firmware storage in microprocessor-based embedded controllers without wait states.
For engineers reviewing the AT27C512R-15JI datasheet, AT27C512R-15JI pinout, AT27C512R-15JI application, or AT27C512R-15JI equivalent, key selection criteria include verified 150 ns read timing, industrial-grade reliability (200 mA latchup immunity, 2 kV ESD), JEDEC-standard 28-pin SOIC package compatibility, and OTP firmware integrity for legacy boot code and configuration storage.
Technical Context
The AT27C512R-15JI implements a parallel-addressed OTP EPROM architecture with 16 address inputs (A0–A15), 8 bidirectional data outputs (O0–O7), and two active-low control lines: Chip Enable (CE) and Output Enable/VPP (OE/VPP). Its Rapid™ Programming Algorithm uses 13.0 V on OE/VPP and 6.5 V on VCC during programming, with 100 µs CE pulses and verification loops per byte.
It operates in five distinct modes: Read, Output Disable, Standby, Rapid Program, and Product Identification - each determined by specific voltage and timing conditions on CE, OE/VPP, and A9/A0. The integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x0D) enables automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for full boot ROM or firmware image in 8-bit microcontroller systems |
| Access Time (tACC) | 150 ns max - ensures compatibility with 6–7 MHz Z80, 8051, and 68000-based systems without wait-state insertion |
| Supply Voltage | 5V ±10% - eliminates need for dedicated programming voltage regulators in read-only applications |
| Active Current (ICC) | 20 mA max at 5 MHz - supports low-power embedded designs with minimal thermal impact |
| Standby Current (ISB) | 100 µA max (CMOS mode) - enables battery-backed retention in power-sensitive industrial controllers |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time by >5× vs. legacy EPROMs |
| ESD/Latchup | 2,000 V HBM ESD protection and 200 mA latchup immunity - meets industrial IEC 61000-4-2 robustness requirements |
Pinout & Package
AT27C512R-15JI is supplied in a 28-lead, 0.330" wide plastic gull-wing small outline (SOIC) package (JEDEC MS-012AB), pin-compatible with industry-standard 28-pin EPROM footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus interface; latched on CE falling edge for memory location selection |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; high-impedance when CE or OE/VPP is high |
| CE | Chip Enable | Primary device select; must be low for read or program operations; controls standby current state |
| OE/VPP | Output Enable / Programming Voltage | Low enables output drivers during read; 13.0 V applied for programming; dual-function pin requires voltage sequencing |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling per device |
| VCC | Power Supply | 5V ±10% supply; must be applied simultaneously with or before OE/VPP and removed after it |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with built-in verification loop - reduces production line throughput time and improves yield |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) accessible via A9=12.0 V and A0 toggle - enables auto-detection and algorithm matching in universal programmers |
| Dual-Line Control Architecture | Independent CE and OE/VPP pins allow flexible bus arbitration and eliminate contention in multi-device memory maps |
| Industrial Temperature Range | –40°C to +85°C operation - validated for use in motor drives, PLC modules, and factory automation hardware |
| JEDEC-Standard Packaging | 28-lead SOIC (28R) footprint - ensures drop-in replacement for legacy 27C512 variants and compatibility with existing PCB layouts |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers operating in factory environments with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 150 ns instruction fetch timing to ensure real-time scan cycle consistency. Use Value: Eliminates reliance on external EEPROM or flash with slower write cycles; OTP prevents accidental firmware corruption during field operation. |
Use Scenario: Hosting startup code and peripheral initialization routines for 8051- or Z80-based embedded instrumentation where firmware updates are rare and security against modification is critical. IC Role / Device Role / Timing Role: Parallel-addressed read-only memory mapped into CPU address space; accessed as memory-mapped I/O with no wait states required. Use Value: Guarantees bit-perfect firmware execution across product lifetime - no wear-out mechanisms or voltage-margin degradation over time. |
| Automotive ECU Configuration Memory | Medical Device Calibration Data Storage |
Use Scenario: Holding vehicle-specific calibration constants (e.g., fuel map offsets, sensor bias values) in engine control units certified for –40°C to +125°C operation (via automotive-grade variant AT27C512R-15JA). IC Role / Device Role / Timing Role: Static configuration store accessed during ECU power-up sequence; read once and cached in RAM for runtime use. Use Value: Provides tamper-proof, non-volatile storage immune to power loss or electromagnetic interference during engine cranking. |
Use Scenario: Retaining factory-calibrated ADC offset/gain coefficients and safety-critical lookup tables in Class II medical analyzers requiring long-term data integrity and regulatory traceability. IC Role / Device Role / Timing Role: Read-only memory accessed during device self-test at power-on; no runtime writes permitted post-manufacture. Use Value: Meets IEC 62304 software lifecycle requirements by preventing field modification of calibrated parameters - ensuring repeatable diagnostic accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-15JC | Same die, commercial temperature range (0°C to +70°C); identical AC/DC specs except ISB (100 µA vs. 1 mA TTL mode) | Limited to office/lab environments; not rated for industrial thermal cycling or extended temperature storage | Select only if system ambient stays within 0–70°C and cost sensitivity outweighs long-term reliability needs. |
| AM27C512-15DC | AMD second-source part; same 28-pin SOIC package and 150 ns timing, but higher standby current (250 µA typical) and no integrated ID code | Lacks auto-programmer recognition; requires manual algorithm selection and voltage setup in programming equipment | Use when legacy AMD tooling is in place and ID-code functionality is unnecessary for production flow. |
Compared with AT27C512R-15JI, the AT27C512-15JC sacrifices industrial temperature resilience for lower cost, while the AM27C512-15DC omits product identification - increasing programming setup time and reducing traceability in high-volume manufacturing.
Availability
AT27C512R-15JI is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller boot systems, and medical device calibration storage requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-15JI 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 maintains full technical and supply chain continuity for the AT27C512R family, including legacy OTP EPROMs used in long-lifecycle industrial designs.
The AT27C512R belongs to Atmel's legacy OTP EPROM product line, designed specifically for firmware and configuration storage in systems where code immutability, long-term data retention (>20 years), and deterministic read timing are mandatory.
FAQ
What is the maximum operating temperature range for the AT27C512R-15JI?
The AT27C512R-15JI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Ordering Information table (page 9) and applies to all electrical and timing parameters under DC and AC operating conditions. The device undergoes full characterization across this range, including 150 ns access time validation and 100 µA standby current compliance.
Does the AT27C512R-15JI require a separate programming voltage supply?
Yes - the AT27C512R-15JI requires 13.0 V ±0.25 V applied to the OE/VPP pin during programming, while VCC must be raised to 6.5 V ±0.25 V. These voltages are specified in the DC Programming Characteristics table (page 6). During normal read operation, only 5V ±10% on VCC is needed; OE/VPP functions as Output Enable at TTL/CMOS logic levels.
Is the AT27C512R-15JI pin-compatible with other 28-pin EPROMs like the 27C512?
Yes - the AT27C512R-15JI uses the standard 28-pin SOIC (28R) pinout defined in JEDEC MS-012AB, matching the original 27C512 and AM27C512. Pin functions (A0–A15, O0–O7, CE, OE/VPP, GND, VCC) are electrically and physically identical, enabling direct PCB footprint reuse without layout changes.
What is the purpose of the Integrated Product Identification Code in the AT27C512R-15JI?
The Integrated Product Identification Code allows automatic detection of the AT27C512R-15JI by industry-standard programmers. By applying 12.0 V to A9 and toggling A0, the device returns Manufacturer ID 0x1E and Device ID 0x0D - enabling the programmer to select correct voltage levels, timing, and verification algorithms without manual configuration.
Can the AT27C512R-15JI be used in new designs, or is it obsolete?
The AT27C512R-15JI remains actively supported by Microchip Technology with documented availability and lifecycle management. While newer flash alternatives exist, this OTP EPROM is explicitly maintained for legacy system repair, long-lifecycle industrial equipment, and applications requiring guaranteed write-protection, zero wear-out, and 20+ year data retention - making it viable for new designs with those requirements.
AT27C512R-15JI 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:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 150 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)
AT27C512R-15JI FAQ
1.How can I place an order for AT27C512R-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-15JI 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 AT27C512R-15JI reliable?
The price and inventory of AT27C512R-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-15JI is usually 5 days.
3.What payment methods are accepted for AT27C512R-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-15JI?
AT27C512R-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-15JI 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 AT27C512R-15JI?
For technical support, including AT27C512R-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-15JI requirements.
6.How does Aetrix verify that AT27C512R-15JI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-15JI 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 AT27C512R-15JI meets industry standards.
7.What is the process for return or replacement of AT27C512R-15JI?
All AT27C512R-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-15JI, 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 AT27C512R-15JI part is unused and in its original packaging.
Return procedure for AT27C512R-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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