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Microchip Technology AT27C4096-55JU-T
- Part No.:
- AT27C4096-55JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-55JU-T.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
AT27C4096-55JU-T from Microchip Technology (formerly Atmel) is a 4-Mbit one-time programmable EPROM organized as 256K × 16, featuring 55 ns read access time, 5 V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It serves as a firmware storage device in 16-/32-bit microprocessor systems, eliminating WAIT states with fast random-access timing and supporting CMOS/TTL-compatible bus interfacing.
For engineers reviewing the AT27C4096-55JU-T datasheet, AT27C4096-55JU-T pinout, AT27C4096-55JU-T application, or AT27C4096-55JU-T equivalent, key selection criteria include OTP reliability, rapid 50 µs/word programming, integrated product identification code, JEDEC-standard 44-lead PLCC packaging, and low 100 µA max standby current for embedded firmware retention.
Technical Context
The AT27C4096-55JU-T implements a two-line control architecture (CE/OE) to prevent bus contention in high-speed systems and supports direct upgrade paths from AT27C516, AT27C1024, and AT27C2048 EPROMs. Its x16 data bus organization enables efficient data throughput in 16-bit processor interfaces and eliminates byte-wide access bottlenecks.
It features rapid programming with 50 µs/word CE pulse width, 12.0 V ±0.5 V VPP programming voltage, and built-in product identification logic that outputs manufacturer code (001Eh) and device code (00F4h) via dedicated address-controlled read mode - both verified under 6.5 V VCC and 13.0 V VPP conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4,194,304-bit (256K × 16), enabling full firmware image storage for mid-complexity microcontrollers |
| Read access time | 55 ns max - ensures zero-WAIT-state operation with 18 MHz CPU buses |
| Supply voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Standby current | 100 µA max - supports low-power system sleep modes without memory retention loss |
| Active current | 40 mA max at 5 MHz - defines thermal budget for dense EPROM arrays on PCBs |
| Programming speed | 50 µs/word typical - reduces production programming cycle time by >90% vs legacy EPROMs |
| Operating temperature | –40°C to +85°C - qualified for industrial control, instrumentation, and factory automation |
Pinout & Package
AT27C4096-55JU-T is supplied in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 16.51–16.66 mm body width and 1.27 mm lead pitch. Both GND pins must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address inputs | 18-bit address bus supporting full 256K-word addressing space |
| O0–O15 | Data outputs | 16-bit bidirectional data path aligned to x16 microprocessor data buses |
| CE | Chip enable | Active-low global enable controlling device power state and output drivers |
| OE | Output enable | Active-low control for output buffer tri-state, enabling shared bus arbitration |
| VPP | Programming voltage | 12.0 V ±0.5 V input required only during programming; must be ramped with VCC |
| NC | No connect | Unbonded pins (positions 7, 11, 22, 23, 39 in PLCC); must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 50 µs/word pulse width with up to 10 retries per word ensures high-yield production programming |
| Integrated product ID code | Electronically readable manufacturer (001Eh) and device (00F4h) codes simplify automated programmer setup |
| Two-line control (CE/OE) | Eliminates bus contention in multi-device systems and enables clean output float timing (tDF = 20 ns) |
| ESD and latchup immunity | 2,000 V HBM ESD protection and 200 mA latchup immunity ensure robust handling in manufacturing environments |
| Green Pb/halide-free packaging | RoHS-compliant matte tin lead finish meets industrial environmental compliance requirements |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Upgrade |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping firmware in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: OTP EPROM providing nonvolatile, tamper-resistant firmware storage with deterministic 55 ns read latency for real-time scan-cycle execution. Use Value: Eliminates reliance on external EEPROM or Flash with wear-out concerns; supports long-term firmware stability over 20+ year product lifecycles. | Use Scenario: Replacing obsolete AT27C2048 or AT27C1024 EPROMs in aging medical analyzers and test equipment where board layout cannot be modified. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade delivering 2× memory density while maintaining identical 40-lead PDIP footprint and 5 V interface timing. Use Value: Doubles available firmware space without redesign - enables feature expansion and bug-fix patches in field-deployed units. |
| Avionics Boot ROM | Automated Test Equipment (ATE) Pattern Memory |
Use Scenario: Holding boot code and configuration tables in airborne data acquisition modules certified to DO-254 Level A, requiring radiation-tolerant, nonvolatile storage. IC Role / Device Role / Timing Role: Radiation-hardened-by-design OTP memory serving as primary boot ROM with guaranteed data integrity over mission lifetime. Use Value: No write endurance limits or refresh cycles; immune to single-event upsets affecting volatile or Flash-based alternatives. | Use Scenario: Storing digital stimulus/response patterns in high-speed semiconductor ATE platforms requiring nanosecond-level timing repeatability across millions of test cycles. IC Role / Device Role / Timing Role: High-speed x16 parallel memory delivering deterministic 55 ns access for pattern sequencer engines synchronized to 18 MHz clocks. Use Value: Enables sub-100 ns pattern turnaround without pipeline stalls - critical for achieving >100 MHz test throughput on DUTs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-55PU | Same die, 40-lead PDIP package instead of 44-lead PLCC; identical timing, voltage, and programming specs | Requires through-hole PCB layout; lacks surface-mount compatibility and higher pin-count routing flexibility | Select when legacy through-hole assembly infrastructure is in place and board space permits larger DIP footprint |
| AM27C4096-55DC | AMD second-source version; same 44-lead PLCC, 55 ns access, and 256K × 16 organization; minor differences in VPP tolerance (12.0 V ±0.3 V) | Validated in same industrial temperature range but discontinued since 2005; limited new-production availability | Consider only for obsolescence mitigation with existing AMD-qualified designs; verify VPP regulator compatibility |
Compared with AT27C4096-55PU and AM27C4096-55DC, the AT27C4096-55JU-T offers superior surface-mount manufacturability in JEDEC-standard PLCC, consistent 55 ns timing across temperature, and active Microchip supply chain support - making it the preferred choice for new industrial designs requiring long-term component continuity.
Availability
AT27C4096-55JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system upgrades, avionics boot ROM, and automated test equipment pattern memory requiring stable component supply and long-lifecycle assurance.
Supply support for AT27C4096-55JU-T 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 responsibility for the AT27C4096-55JU-T. The company specializes in secure, reliable, and long-lifecycle semiconductor solutions for industrial, aerospace, and automotive markets.
This device belongs to Atmel's legacy OTP EPROM product line, designed specifically for firmware storage in systems demanding absolute data immutability, zero write endurance constraints, and deterministic read timing - especially where Flash wear-out or SRAM volatility are unacceptable.
FAQ
What is the programming voltage requirement for AT27C4096-55JU-T?
The AT27C4096-55JU-T requires a VPP programming voltage of 12.0 V ±0.5 V applied simultaneously with or after VCC, and removed simultaneously with or before VCC. This voltage is used exclusively during programming; during normal read operation, VPP may be tied to VCC. The device includes internal circuitry to detect VPP level and initiate the rapid programming algorithm only when correct voltage is present - ensuring safe, repeatable programming of the AT27C4096-55JU-T without risk of accidental writes.
Does AT27C4096-55JU-T support automatic identification by programmers?
Yes, the AT27C4096-55JU-T integrates a product identification code accessible via dedicated read mode: with A9 held at 12.0 V and A0 toggled, it outputs manufacturer ID 001Eh and device ID 00F4h on O15–O0. This feature allows industry-standard programmers to auto-detect the AT27C4096-55JU-T, select correct algorithms, and verify programming parameters - reducing setup errors and improving yield in high-volume AT27C4096-55JU-T programming lines.
Can AT27C4096-55JU-T operate reliably at the full industrial temperature range?
Yes, the AT27C4096-55JU-T is fully specified and tested across –40°C to +85°C ambient temperature. All key parameters - including 55 ns read access time, 100 µA max standby current, and 40 mA max active current - are guaranteed over this range. The device uses high-reliability CMOS process technology with 2,000 V ESD protection and 200 mA latchup immunity, ensuring stable AT27C4096-55JU-T operation in harsh industrial environments such as factory automation and outdoor instrumentation.
Is AT27C4096-55JU-T pin-compatible with earlier Atmel EPROMs like AT27C2048?
No, the AT27C4096-55JU-T is not pin-compatible with AT27C2048 (2 Mbit, 24-pin DIP) or AT27C1024 (1 Mbit, 32-pin PLCC). However, it is a functional upgrade: the AT27C4096-55JU-T provides double the density of AT27C2048 and quadruple that of AT27C1024, with identical 5 V interface, CMOS/TTL compatibility, and two-line control. Migration requires PCB layout update but preserves system timing and software compatibility - making the AT27C4096-55JU-T ideal for firmware capacity expansion in mature designs.
What decoupling capacitance is required for stable AT27C4096-55JU-T operation?
Each AT27C4096-55JU-T requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For boards with multiple AT27C4096-55JU-T devices or large EPROM arrays, an additional 4.7 µF bulk electrolytic capacitor must be connected between VCC and GND near the power entry point. These values are mandatory to suppress transient voltage excursions during CE switching and ensure AT27C4096-55JU-T conformance to datasheet timing and reliability specifications.
AT27C4096-55JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 55 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)
AT27C4096-55JU-T FAQ
1.How can I place an order for AT27C4096-55JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-55JU-T 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 AT27C4096-55JU-T reliable?
The price and inventory of AT27C4096-55JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-55JU-T is usually 5 days.
3.What payment methods are accepted for AT27C4096-55JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-55JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-55JU-T?
AT27C4096-55JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-55JU-T 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 AT27C4096-55JU-T?
For technical support, including AT27C4096-55JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-55JU-T requirements.
6.How does Aetrix verify that AT27C4096-55JU-T is sourced from the original manufacturer or authorized distributors?
All AT27C4096-55JU-T 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 AT27C4096-55JU-T meets industry standards.
7.What is the process for return or replacement of AT27C4096-55JU-T?
All AT27C4096-55JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-55JU-T, 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 AT27C4096-55JU-T part is unused and in its original packaging.
Return procedure for AT27C4096-55JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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