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Microchip Technology AT27C4096-12JC
- Part No.:
- AT27C4096-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-12JC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,646
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Product details
Overview
AT27C4096-12JC from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM with 120 ns read access time, 5V ±10% supply, and JEDEC-standard 44-lead PLCC package. It delivers TTL/CMOS-compatible I/O, dual-line control (CE/OE), and supports high-performance 16-/32-bit microprocessor systems in firmware storage applications.
For engineers reviewing the AT27C4096-12JC datasheet, AT27C4096-12JC pinout, AT27C4096-12JC application, or AT27C4096-12JC equivalent, key selection criteria include verified 120 ns tACC timing, industrial-grade -40°C to +85°C operation (per J-suffix), PLCC package mechanical compatibility, and Rapid™ programming algorithm support at 50 µs/word.
Technical Context
The AT27C4096-12JC operates in five distinct modes-Read, Output Disable, Standby, Rapid Program, and Product Identification-controlled by CE, OE, and VPP voltage states. Its two-line enable architecture (CE and OE) eliminates bus contention in high-speed systems, while A0–A17 address lines and O0–O15 bidirectional data outputs define its 256K-word × 16-bit organization.
Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a 47.5–52.5 µs CE pulse width. The Integrated Product Identification Code uses A9 at 12.0 V and A0 toggling to select Manufacturer ID (001Eh) or Device Code (00F4h), enabling automated programmer recognition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (256K × 16), enabling full firmware image storage for 16-bit embedded controllers |
| Access Time (tACC) | 120 ns max - guarantees no WAIT states required in 8.3 MHz bus systems |
| VCC Supply | 5V ±10% - compatible with standard logic rails without regulation overhead |
| Standby Current (ISB) | 100 µA max - enables low-power hold mode in battery-backed systems |
| Active Current (ICC) | 40 mA max at 5 MHz - defines thermal budget for dense EPROM arrays |
| ESD Protection | 2,000V HBM - ensures robustness during manual handling and board assembly |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage conditions |
Pinout & Package
AT27C4096-12JC is supplied in a 44-lead plastic J-leaded chip carrier (PLCC) per JEDEC MS-018 AC, with 1.27 mm lead pitch and body size 16.7 mm × 16.7 mm. Both GND pins (pins 13 and 29) must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word decoding; A0–A17 must be stable before CE/OE assertion |
| O0–O15 | Data Outputs | 16-bit bidirectional data path; high-impedance when CE or OE is inactive |
| CE | Chip Enable | Primary device select; active-low; controls power state transition between active and standby |
| OE | Output Enable | Secondary output gate; active-low; enables data bus drive only when CE is also asserted |
| VPP | Programming Voltage | 12.0 V ±0.5 V input for programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | 5V ±10% main supply; powers core logic and I/O buffers in read/program modes |
| GND (Pins 13, 29) | Ground Reference | Dual ground connections reduce noise coupling and ensure stable reference for all internal circuits |
| NC (Pins 7, 22, 43) | No Connect | Internally unconnected; must remain floating - no external tie required |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time reduces firmware update cycle duration by >90% vs legacy EPROMs |
| Integrated Product ID Code | Electronic manufacturer (001Eh) and device code (00F4h) detection enables auto-algorithm selection in production programmers |
| Two-Line Control Architecture | Independent CE and OE inputs eliminate bus contention and allow precise output timing control in multiprocessor systems |
| JEDEC-Standard Packaging | 44J PLCC footprint ensures drop-in replacement compatibility with existing socketed EPROM designs |
| High-Reliability CMOS Process | 2,000V ESD and 200mA latchup immunity meet industrial environmental stress requirements |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing ladder logic firmware in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 120 ns read access to instruction fetch bus of 16-bit microcontroller. Use Value: Eliminates WAIT states in 8.3 MHz bus cycles, ensuring real-time scan execution without timing jitter. | Use Scenario: Replacing obsolete 2M-bit EPROMs in medical diagnostic equipment where firmware updates are infrequent but reliability is critical. IC Role / Device Role / Timing Role: OTP firmware repository with guaranteed data retention >10 years and immunity to accidental reprogramming. Use Value: Direct upgrade path from AT27C2048 with identical pinout and interface, minimizing redesign effort. |
| Military Avionics Configuration Memory | Test Equipment Calibration Data Storage |
Use Scenario: Holding flight-critical configuration tables in airborne mission computers requiring MIL-STD-883-compliant component sourcing. IC Role / Device Role / Timing Role: Radiation-tolerant, high-reliability OTP memory accessed during cold-start initialization sequence. Use Value: 200 mA latchup immunity and -40°C to +85°C industrial grade operation ensure functional integrity under extreme thermal cycling. | Use Scenario: Storing precision calibration coefficients in automated test equipment where recalibration occurs quarterly and data integrity is auditable. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with integrated ID code for traceable calibration versioning. Use Value: Manufacturer and device identification codes (001Eh/00F4h) enable automated calibration log verification during firmware upload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-12PC | Same die, 40-lead PDIP package (40P6); 0.600" width; no J-lead geometry | Through-hole PCB assembly; no surface-mount reflow requirement | Select for legacy through-hole designs or prototyping with DIP sockets |
| AT27C4096-12VI | Same die, 40-lead VSOP package (40V); 10 mm × 14 mm footprint; industrial temp range | Space-constrained industrial boards requiring surface-mount density | Select when board area is limited and JEDEC MO-142 CA compliance is required |
Compared with AT27C4096-12PC and AT27C4096-12VI, the AT27C4096-12JC offers standardized PLCC socket compatibility, superior thermal dissipation via J-lead geometry, and proven field reliability in vibration-prone industrial control cabinets - making it optimal for new designs targeting serviceability and long-term component availability.
Availability
AT27C4096-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, and military avionics configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C4096-12JC 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 (now part of Microchip Technology) designed high-reliability nonvolatile memory and microcontrollers for industrial, automotive, and aerospace applications before its 2016 acquisition.
The AT27C4096 belongs to Atmel's OTP EPROM product line, engineered for firmware storage in systems where code immutability, long-term data retention, and deterministic read timing are mandatory - not for reprogrammable or flash-based use cases.
FAQ
What is the maximum operating temperature range for the AT27C4096-12JC?
The AT27C4096-12JC is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table on page 9 of the official datasheet, where the "J" suffix explicitly denotes the industrial grade. The device maintains full 120 ns access time and 40 mA active current compliance across this entire range, making AT27C4096-12JC suitable for deployment in harsh environments such as factory automation and outdoor telecom infrastructure.
Does the AT27C4096-12JC require a programming voltage during normal read operation?
No, the AT27C4096-12JC operates from a single 5V ±10% supply during normal read mode; VPP is only required during programming. In read mode, VPP may be tied to VCC (as noted in DC Operating Conditions footnote 2), and the device draws ≤40 mA active current and ≤100 µA standby current. Applying 12 V to VPP during read operation is unnecessary and risks violating absolute maximum ratings - the AT27C4096-12JC's design strictly separates read and program power domains.
How many address and data lines does the AT27C4096-12JC have?
The AT27C4096-12JC has 18 address lines (A0–A17) and 16 data output lines (O0–O15), reflecting its 256K × 16-bit organization totaling 4,194,304 bits. This configuration is explicitly defined in the Pin Configurations section (page 2) and Block Diagram (page 3) of the datasheet. The 18-bit address bus fully decodes all 262,144 words, and the 16-bit data bus aligns with 16-/32-bit microprocessor data paths - a key reason AT27C4096-12JC was adopted in high-performance embedded systems.
Can the AT27C4096-12JC be used as a direct replacement for AT27C2048-based designs?
Yes, the AT27C4096-12JC is specified as a direct upgrade from AT27C2048 (2M-bit) EPROMs, with identical pinout, voltage levels, and control signaling. As stated in the Features section, it supports the same JEDEC-standard packages and requires no PCB changes. However, firmware must be recompiled for the doubled address space (A18 is unused but must be strapped per system design), and the AT27C4096-12JC's 120 ns access time may necessitate timing adjustments in systems originally designed for slower variants - confirming AT27C4096-12JC compatibility requires validation of setup/hold margins.
What decoupling capacitance is required for stable operation of the AT27C4096-12JC?
The AT27C4096-12JC requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins, per the System Considerations section (page 2). For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are mandated to suppress transient voltage excursions during CE transitions - failure to implement them risks exceeding absolute maximum ratings and causing non-conformance, as explicitly warned in the datasheet for AT27C4096-12JC and all speed grades.
AT27C4096-12JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-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:
- 256K x 16
- 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:
- 44-PLCC (16.6x16.6)
AT27C4096-12JC FAQ
1.How can I place an order for AT27C4096-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-12JC 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 AT27C4096-12JC reliable?
The price and inventory of AT27C4096-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-12JC is usually 5 days.
3.What payment methods are accepted for AT27C4096-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-12JC?
AT27C4096-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-12JC 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 AT27C4096-12JC?
For technical support, including AT27C4096-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-12JC requirements.
6.How does Aetrix verify that AT27C4096-12JC is sourced from the original manufacturer or authorized distributors?
All AT27C4096-12JC 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 AT27C4096-12JC meets industry standards.
7.What is the process for return or replacement of AT27C4096-12JC?
All AT27C4096-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-12JC, 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 AT27C4096-12JC part is unused and in its original packaging.
Return procedure for AT27C4096-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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