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Microchip Technology AT27C4096-12JI
- Part No.:
- AT27C4096-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-12JI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,404
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Product details
Overview
AT27C4096-12JI from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM designed for firmware storage in 16-/32-bit microprocessor systems. It operates on a single 5V ±10% supply, delivers 55 ns read access time, consumes ≤100 µA standby current, and supports industrial temperature range (−40°C to +85°C) in 44-lead PLCC package.
For engineers reviewing the AT27C4096-12JI datasheet, AT27C4096-12JI pinout, AT27C4096-12JI application, or AT27C4096-12JI equivalent, key selection factors include its dual-line control (CE/OE), Rapid™ programming at 50 µs/word, integrated product identification code, and JEDEC-standard PLCC packaging for legacy system upgrades.
Technical Context
The AT27C4096-12JI implements a CMOS OTP EPROM architecture with 18 address lines (A0–A17) and 16 bidirectional data outputs (O0–O15), enabling direct replacement of 512K-, 1M-, and 2M-bit EPROMs. Its two-line enable scheme (CE and OE) eliminates bus contention in high-speed read cycles.
Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a verified 50 µs CE pulse width per word and up to 10 reprogramming attempts per failed location. Product identification uses A9 at 12.0 V and A0 toggling to select manufacturer/device codes (001Eh/00F4h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (256K × 16 organization) |
| Read Access Time | 120 ns max - defines worst-case wait-state-free timing for 8.3 MHz bus operation |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Standby Current | ≤100 µA - enables low-power retention in battery-backed or intermittent-read systems |
| Active Current | ≤40 mA at 5 MHz - supports sustained burst reads without thermal derating |
| ESD Protection | 2,000 V HBM - ensures robustness during manual handling and board assembly |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage or ground bounce |
Pinout & Package
AT27C4096-12JI is packaged in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 1.27 mm lead pitch and body size 16.7 mm × 16.7 mm. Both GND pins must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; fully decoded to select one of 256K words |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; CMOS/TTL-compatible output drive (2.1 mA sink, −400 µA source) |
| CE | Chip Enable | Primary device select; active-low; controls power state transition between standby and active |
| OE | Output Enable | Secondary output gate; active-low; enables data bus drivers independently of CE |
| VPP | Programming Voltage | 13.0 V input required only during programming; must be applied after and removed before VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and output buffers during read and program modes |
| GND | Ground | Two dedicated ground pins; both must be connected to minimize noise and ensure ESD path integrity |
| NC | No Connect | Pins 7, 28, and 43 are internally unconnected; must remain floating or tied to GND per layout best practice |
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 (00F4h) identification enables auto-detection in universal programmers |
| Dual-Line Control (CE/OE) | Independent chip and output enables prevent bus contention and support interleaved memory access schemes |
| JEDEC Standard Packaging | 44J PLCC footprint ensures drop-in compatibility with existing sockets and PCB layouts for legacy upgrades |
| High-Reliability CMOS Process | 2,000 V ESD and 200 mA latchup immunity meet industrial environmental stress requirements |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Instrumentation |
|---|---|
Use Scenario: Storing boot code and calibration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Non-volatile firmware ROM providing deterministic 120 ns read latency to CPU address/data bus during cold start and runtime execution. Use Value: Eliminates need for external wait-state generators due to guaranteed tACC ≤120 ns, reducing MCU interface complexity and BOM count. | Use Scenario: Replacing obsolete 2M-bit EPROMs in medical analyzers and test equipment where firmware updates occur infrequently but require long-term data retention. IC Role / Device Role / Timing Role: Pin-compatible OTP upgrade path (AT27C2048 → AT27C4096-12JI) supporting same PLCC socket and address decoding logic. Use Value: Doubles firmware capacity without PCB redesign, leveraging identical 44J footprint and 5 V supply rail. |
| Military Avionics Boot ROM | Automotive Engine Control Unit |
Use Scenario: Secure boot image storage in airborne mission computers requiring radiation-tolerant, non-volatile memory with traceable manufacturing origin. IC Role / Device Role / Timing Role: Read-only memory mapped at fixed CPU address space; accessed during power-on reset sequence with strict timing margins. Use Value: Integrated product ID code (001Eh/00F4h) enables automated verification of authentic Atmel silicon during depot-level maintenance. | Use Scenario: Storing engine calibration maps and diagnostic routines in early-generation ECUs where EEPROM endurance was insufficient for field updates. IC Role / Device Role / Timing Role: High-reliability OTP storage with 200 mA latchup immunity withstands automotive load-dump transients and ground bounce. Use Value: 100 µA max standby current extends battery life during vehicle off-state, critical for anti-theft and immobilizer subsystems. |
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); no PLCC mounting; higher thermal resistance | Suitable for through-hole prototyping or legacy DIP-based systems; not socket-compatible with PLCC | Select when board layout uses 0.600" DIP sockets or requires manual soldering accessibility |
| AT27C4096-12VI | Same die, 40-lead VSOP package (40V); 10 mm × 14 mm footprint; surface-mount only | Targeted at space-constrained designs; lacks PLCC mechanical robustness for high-vibration environments | Select when PCB real estate is limited and vibration exposure is minimal (e.g., consumer electronics) |
Compared with AT27C4096-12PC and AT27C4096-12VI, the AT27C4096-12JI offers industrial-grade PLCC packaging optimized for socketed, serviceable, and mechanically stable deployments in harsh environments-without requiring PCB redesign from legacy 44J footprints.
Availability
AT27C4096-12JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded instrumentation, military avionics boot ROM, and automotive engine control unit applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C4096-12JI 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) is a fabless semiconductor company specializing in microcontrollers, non-volatile memory, and secure authentication ICs for industrial, automotive, and communications markets.
The AT27C4096 product line delivers high-density, industrial-temperature OTP EPROMs for firmware storage in systems where EEPROM endurance or Flash write-cycle limitations are unacceptable - targeting long-lifecycle, field-upgrade-averse applications.
FAQ
What is the maximum operating temperature range for the AT27C4096-12JI?
The AT27C4096-12JI is rated for industrial temperature operation from −40°C to +85°C. This specification is validated per JEDEC JESD22-A108 and applies to all DC and AC parameters in the datasheet, including read access time (tACC ≤120 ns), standby current (ISB ≤100 µA), and programming voltage tolerance. The "I" suffix in AT27C4096-12JI explicitly denotes this industrial grade.
Does the AT27C4096-12JI require a separate programming voltage during normal read operation?
No, the AT27C4096-12JI operates from a single 5 V ±10% supply (VCC) during read mode. VPP (13.0 V) is required only during programming and must be disconnected or held at 5 V during standby/read. The datasheet specifies that VPP = VCC during standby to limit ISB, and applying VPP > VCC during read may increase standby current beyond 100 µA.
How many address and data pins does the AT27C4096-12JI have?
The AT27C4096-12JI has 18 address pins (A0 through A17) and 16 data pins (O0 through O15), matching its 256K × 16 organization. These are physically implemented on pins 22–39 (A0–A17) and pins 1–8, 10–17 (O0–O15) of the 44J PLCC package. Pin 9 is VPP, pin 18 is CE, pin 19 is OE, and pins 20 and 44 are GND.
Can the AT27C4096-12JI be used as a direct replacement for the AT27C2048 in an existing design?
Yes - the AT27C4096-12JI is explicitly documented as a direct upgrade from the AT27C2048 (2M-bit EPROM). It shares identical pinout, voltage levels, timing interface (CE/OE), and PLCC packaging (44J), enabling drop-in replacement. Firmware must be reorganized to use the full 256K × 16 space, but address decoding logic and socket footprint remain unchanged.
What decoupling capacitors are required for stable operation of the AT27C4096-12JI?
The AT27C4096-12JI requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to pins 20 and 44. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be connected between VCC and GND near the power entry point. These values are specified in the "System Considerations" section to suppress transients during CE transitions and stabilize VCC under dynamic load.
AT27C4096-12JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C4096-12JI FAQ
1.How can I place an order for AT27C4096-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-12JI 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 AT27C4096-12JI reliable?
The price and inventory of AT27C4096-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-12JI is usually 5 days.
3.What payment methods are accepted for AT27C4096-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-12JI?
AT27C4096-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-12JI 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 AT27C4096-12JI?
For technical support, including AT27C4096-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-12JI requirements.
6.How does Aetrix verify that AT27C4096-12JI is sourced from the original manufacturer or authorized distributors?
All AT27C4096-12JI 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 AT27C4096-12JI meets industry standards.
7.What is the process for return or replacement of AT27C4096-12JI?
All AT27C4096-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-12JI, 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 AT27C4096-12JI part is unused and in its original packaging.
Return procedure for AT27C4096-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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