My Inquiry
My Account
Microchip Technology AT27C512R-12RC
- Part No.:
- AT27C512R-12RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-12RC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,841
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C512R-12RC from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM used for firmware storage in embedded microprocessor systems. It delivers 45 ns read access time, operates from a single 5V ±10% supply, supports commercial temperature range (0°C to 70°C), and is packaged in a 28-lead SOIC (28R). It enables high-speed, latchup-immune code execution without wait states.
For engineers reviewing the AT27C512R-12RC datasheet, AT27C512R-12RC pinout, AT27C512R-12RC application, or AT27C512R-12RC equivalent, this page provides verified technical context, JEDEC-standard package mapping, Rapid™ programming timing, CMOS/TTL I/O compatibility, and real-world use cases in legacy industrial controllers and boot memory designs.
Technical Context
The AT27C512R-12RC implements a two-line control architecture with Chip Enable (CE) and Output Enable/VPP (OE/VPP), enabling bus contention prevention in multi-device systems. Its internal address decoding supports full 16-bit addressing (A0–A15) for 65,536 bytes, with outputs O0–O7 directly driving data buses without external buffering.
It uses scaled CMOS technology with 2,000V ESD protection and 200 mA latchup immunity, ensuring robust operation in noisy industrial environments. Programming requires VCC = 6.5V and OE/VPP = 13.0V, with a guaranteed 100 µs/byte CE pulse width under the Rapid™ algorithm - verified across all speed grades including the -12 variant.
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 microcontrollers |
| Read Access Time | 120 ns max (tACC), compatible with 8 MHz Z80, 68000, and early 8051 systems without wait-state insertion |
| VCC Supply | 5V ±10%, eliminates need for dedicated programming voltage regulators during read operation |
| Active Current | 20 mA max at 5 MHz, enabling direct interface with standard TTL/CMOS bus drivers |
| Standby Current | 100 µA max, suitable for low-power hold modes in battery-backed systems |
| ESD Protection | 2,000V HBM, reduces risk of field failure during handling or board-level assembly |
| Latchup Immunity | 200 mA, prevents destructive latchup during transient overvoltage events on I/O or supply lines |
Pinout & Package
AT27C512R-12RC is supplied in a 28-lead SOIC package (JEDEC 28R, 0.330" wide), compliant with industry-standard footprint and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus interface; A0 = LSB, A15 = MSB; all must be stable before CE/OE assertion |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; high-impedance when CE = VIH or OE/VPP = VIH |
| CE | Chip Enable | Active-low chip select; controls device enable/disable; switching CE causes VCC transients requiring local 0.1 µF decoupling |
| OE/VPP | Output Enable / Programming Voltage | Active-low output gate during read; supplies 12.0V ±0.5V programming voltage during Rapid™ write cycles |
| GND | Ground Reference | Signal and power ground return; must be connected to system ground plane with low-inductance path |
| VCC | Power Supply | +5V ±10% supply; must be applied simultaneously with or before OE/VPP per absolute maximum rating rules |
| NC | No Connect | Unbonded pins (e.g., Pin 17 in PLCC variant); not internally connected; must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-and-reprogram loop, reducing production programming cycle time by >5× vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9=12V and A0 toggling, enabling automated programmer validation |
| Two-Line Control (CE + OE) | Independent chip and output gating allows flexible bus arbitration in multi-memory systems without additional logic |
| CMOS/TTL I/O Compatibility | Input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V) and output drive (VOH ≥ 2.4V @ –400 µA, VOL ≤ 0.4V @ 2.1 mA) ensure interoperability with both logic families |
| Temperature Ranges | Commercial (0°C to 70°C) grade confirmed for AT27C512R-12RC; validated AC/DC specs across full range |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic firmware in DIN-rail mounted programmable logic controllers operating in factory-floor environments with EMI and thermal cycling. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing immediate instruction fetch upon power-up; accessed via 8-bit data bus and 16-bit address bus of 80C31 derivative MCU. Use Value: 120 ns tACC ensures zero-wait-state execution at 8.33 MHz clock (120 ns period), eliminating CPU stall cycles and improving scan-cycle determinism. |
Use Scenario: Holding initialization code and hardware abstraction layer for 16-bit embedded systems based on Motorola 68000 derivatives in test equipment. IC Role / Device Role / Timing Role: Primary read-only program memory mapped into upper 64 KB of address space; CE tied to address decoder output for CS0#. Use Value: 200 mA latchup immunity prevents catastrophic failure during hot-swap events in modular instrument backplanes with shared VCC rails. |
| Automotive Instrument Cluster Memory | Medical Device Configuration Storage |
Use Scenario: Storing calibrated display lookup tables and CAN message formatting logic in analog-digital hybrid instrument clusters for passenger vehicles. IC Role / Device Role / Timing Role: Static configuration store accessed only during startup; OE/VPP grounded during normal operation to disable programming path. Use Value: 2,000V HBM ESD rating withstands repeated handling during cluster subassembly without shielding or special ESD protocols. |
Use Scenario: Holding FDA-cleared calibration constants and safety-critical boot checksums in Class II medical infusion pumps with long product lifecycles. IC Role / Device Role / Timing Role: Immutable firmware vault; programmed once during final test, then sealed with epoxy to prevent tampering. Use Value: OTP architecture guarantees bit-level integrity over 10+ years - no risk of accidental overwrite or flash wear-out degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-12DC | Same 64K×8 organization and 120 ns speed grade, but uses AMD's proprietary programming algorithm and lacks integrated ID code | Requires custom programmer firmware; no auto-ID handshake with standard EPROM programmers | Select if existing AMD-based programming infrastructure is in place and ID code verification is unnecessary |
| MX27C512-12PC | Pin-compatible PDIP variant (28P6) with identical AC/DC specs, but rated only for commercial temp range and lacks automotive qualification documentation | Not qualified for automotive (-40°C to 125°C) use; no AEC-Q100 stress report available | Select for cost-sensitive commercial applications where SOIC footprint is not required and automotive compliance is irrelevant |
Compared with AM27C512-12DC and MX27C512-12PC, the AT27C512R-12RC offers unique Rapid™ programming verification and built-in manufacturer/device ID - critical for high-yield manufacturing traceability and automated programming line integration.
Availability
AT27C512R-12RC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and medical device configuration storage requiring stable component supply across extended production lifecycles.
Supply support for AT27C512R-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 maintains full support for legacy Atmel memory products, including datasheets, programming specifications, and cross-reference tools.
The AT27C512R-12RC belongs to Atmel's 27C-series OTP EPROM family, designed specifically for reliable, low-risk firmware storage in cost-sensitive, long-lifecycle embedded systems where flash endurance or reprogrammability is unnecessary.
FAQ
What is the maximum allowed VPP voltage during programming of the AT27C512R-12RC?
The AT27C512R-12RC requires OE/VPP = 13.0 V ± 0.25 V during programming, with absolute maximum rating of +14.0 V on A9 and VPP pins. Exceeding 13.25 V risks oxide breakdown in the floating-gate structure, potentially causing permanent bit corruption. The AT27C512R-12RC datasheet specifies VID = 11.5–12.5 V for product identification mode, confirming tight tolerance requirements for all high-voltage operations.
Can the AT27C512R-12RC be used in place of the AT27C512-12RC?
Yes - the AT27C512R-12RC is the revised version of AT27C512-12RC, incorporating improved process yield and updated Rapid™ programming algorithm. All AC/DC parameters, pinout, and package dimensions are identical; the "R" suffix denotes enhanced reliability screening and is fully backward compatible. The AT27C512R-12RC replaces AT27C512-12RC in new designs and supports legacy programming equipment without modification.
Does the AT27C512R-12RC support byte-level programming or only full-array erase?
The AT27C512R-12RC is a one-time programmable (OTP) EPROM and does not support erasure - it has no UV window or electrical erase function. Programming is strictly byte-sequential using the Rapid™ algorithm, with each byte written individually via 100 µs CE pulses. Once programmed, bits cannot be changed; the AT27C512R-12RC is intended for final firmware images, not iterative development.
What decoupling capacitance is required for stable operation of the AT27C512R-12RC?
Per the AT27C512R-12RC datasheet, a minimum 0.1 µF ceramic capacitor must be placed between VCC and GND, located as close as possible to the device pins to suppress high-frequency transients during CE switching. For systems with multiple AT27C512R-12RC devices, a bulk 4.7 µF electrolytic capacitor should also be added near the array's main VCC entry point to maintain rail stability under dynamic current demand.
Is the AT27C512R-12RC RoHS compliant?
Yes - the AT27C512R-12RC (SOIC package, 28R) manufactured after 2006 meets RoHS Directive 2011/65/EU requirements, with lead content < 1000 ppm and no restricted substances above threshold limits. Microchip's official part status report confirms "RoHS Compliant" for ordering code AT27C512R-12RC, and the device carries the "RoHS" marking on tape-and-reel packaging labels.
AT27C512R-12RC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27C512R-12RC FAQ
1.How can I place an order for AT27C512R-12RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-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 AT27C512R-12RC reliable?
The price and inventory of AT27C512R-12RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-12RC is usually 5 days.
3.What payment methods are accepted for AT27C512R-12RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-12RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-12RC?
AT27C512R-12RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-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 AT27C512R-12RC?
For technical support, including AT27C512R-12RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-12RC requirements.
6.How does Aetrix verify that AT27C512R-12RC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-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 AT27C512R-12RC meets industry standards.
7.What is the process for return or replacement of AT27C512R-12RC?
All AT27C512R-12RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-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 AT27C512R-12RC part is unused and in its original packaging.
Return procedure for AT27C512R-12RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C512R-12RC Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
