My Inquiry
My Account
Microchip Technology AT27C4096-90JU-T
- Part No.:
- AT27C4096-90JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-90JU-T.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C4096-90JU-T from Microchip Technology (formerly Atmel) is a 4-Mbit one-time programmable EPROM organized as 256K × 16, operating at 5V ±10%, with 90ns read access time, 40mA max active current at 5MHz, and industrial temperature range (–40°C to +85°C). It serves as firmware storage in 16-/32-bit microprocessor systems requiring nonvolatile, pin-compatible legacy upgrade paths.
For engineers reviewing the AT27C4096-90JU-T datasheet, AT27C4096-90JU-T pinout, AT27C4096-90JU-T application, or AT27C4096-90JU-T equivalent, key selection criteria include its JEDEC-standard 44-lead PLCC package, dual-line control (CE/OE), rapid 50µs/word programming, integrated product ID code, and CMOS/TTL compatibility for drop-in replacement of older EPROMs.
Technical Context
The AT27C4096-90JU-T implements a parallel x16 OTP EPROM architecture with two-line enable control (CE and OE) to prevent bus contention in high-speed systems. Its address space spans A0–A17 (18 address lines), supporting 256K words, and features dedicated VPP (12V ±0.5V) for programming while maintaining 5V-only operation during read mode.
It integrates an electronic product identification code accessible via A9 high-voltage (11.5–12.5V) and A0 toggling, enabling automatic algorithm selection in industry-standard programmers. The device uses high-reliability CMOS technology with 2,000V ESD protection and 200mA latchup immunity, validated across industrial temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4,194,304-bit (256K × 16) - supports full 16-bit data bus interface without byte-lane splitting |
| Read access time | 90ns max - eliminates WAIT states in 5MHz microprocessor buses |
| Supply voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary supplies needed for read operation |
| Active current | 40mA max at 5MHz - enables stable power budgeting in dense EPROM arrays |
| Standby current | 100µA max - ensures low quiescent draw in powered-down system states |
| Programming speed | 50µs/word typical - reduces firmware burn time by >90% vs. legacy EPROM algorithms |
| Operating temperature | –40°C to +85°C - qualified for industrial control, instrumentation, and legacy embedded platforms |
Pinout & Package
AT27C4096-90JU-T is supplied in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 16.51–16.662 mm body width and 1.27 mm lead pitch. Both GND pins must be connected for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address inputs | 18-bit address bus supporting full 256K-word decoding; A0–A17 required for all read/program operations |
| O0–O15 | Data outputs | True x16 bidirectional data path; outputs driven only when CE=OE=low; high-impedance otherwise |
| CE | Chip enable | Primary device select; controls power state transition between active (VIL) and standby (VIH) |
| OE | Output enable | Secondary output gate; allows shared bus operation without disabling chip power |
| VPP | Programming voltage | 12.0V ±0.5V input required only during programming; must be applied simultaneously with or after VCC |
| VCC | Power supply | 5V ±10% main supply; powers logic and outputs during read; also used with VPP during programming |
| GND (×2) | Ground reference | Two dedicated ground pins required for noise immunity and thermal stability per JEDEC spec |
| NC | No connect | Unbonded pins (e.g., Pin 3, Pin 22); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 50µs/word typical programming time with auto-verify loop - cuts production firmware load time versus AT27C2048/AT27C1024 |
| Integrated product ID code | Manufacturer ID (001Eh) and device code (00F4h) readable via A9 high-voltage and A0 toggle - enables automated programmer recognition |
| Dual-line control (CE/OE) | Independent chip and output enables - prevents bus contention in multi-device memory maps |
| CMOS/TTL compatibility | VIL ≤0.8V, VIH ≥2.0V, VOL ≤0.4V, VOH ≥2.4V - ensures interoperability with both logic families without level shifters |
| Green packaging | Pb/halide-free PLCC - meets RoHS Directive 2011/65/EU without compromising JEDEC mechanical compliance |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
Use Scenario: Stores fixed ladder logic and I/O configuration in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware ROM providing deterministic boot-time instruction fetch with <90ns latency. Use Value: Eliminates reliance on external EEPROM or flash; retains program integrity across power cycles and EMI-rich plant floors. | Use Scenario: Holds self-test routines and calibration constants in aging semiconductor ATE systems where field upgrades are infrequent. IC Role / Device Role / Timing Role: OTP EPROM acting as immutable boot image source with guaranteed data retention >20 years. Use Value: Avoids requalification risk associated with flash wear-out or configuration corruption in mission-critical test hardware. |
| Military Avionics Configuration Memory | Medical Imaging System BIOS |
Use Scenario: Stores aircraft subsystem initialization parameters and safety-critical configuration tables in line-replaceable units (LRUs). IC Role / Device Role / Timing Role: Radiation-tolerant (200mA latchup immunity) firmware store accessed during cold-start sequence. Use Value: Provides tamper-resistant, non-rewritable memory immune to unintended writes during flight vibration or ESD events. | Use Scenario: Contains diagnostic boot firmware and sensor calibration lookup tables in FDA-cleared MRI and CT scanner front-end controllers. IC Role / Device Role / Timing Role: High-reliability OTP memory ensuring BIOS integrity across 10,000+ power cycles in regulated medical devices. Use Value: Meets IEC 62304 software lifecycle requirements by preventing accidental firmware modification post-certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-55JU | 55ns read access time; identical pinout, voltage, and programming specs | Suitable for higher-clock-rate 8086/80286-based systems requiring tighter timing margins | Select when system bus timing demands sub-90ns access; same footprint and firmware compatibility |
| AT27C2048-90JU | 2-Mbit (128K × 16); same 90ns speed, 44-lead PLCC, and 5V/12V dual-supply programming | Used where firmware image size fits within 2Mbit; lower density reduces cost and board area | Choose for cost-sensitive designs with smaller firmware footprints; requires address decoding adjustment |
Compared with AT27C4096-55JU, the AT27C4096-90JU-T trades 35ns slower access for broader timing margin tolerance in noisy industrial environments; versus AT27C2048-90JU, it doubles storage capacity without changing PCB layout or power delivery design.
Availability
AT27C4096-90JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy test equipment boot ROM, and military avionics configuration memory requiring stable component supply and long-term obsolescence management.
Supply support for AT27C4096-90JU-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 manufacturing continuity for the AT27C EPROM family. The company specializes in secure, reliable, and long-lifecycle semiconductor solutions for industrial and aerospace markets.
The AT27C4096 belongs to Atmel's legacy OTP EPROM product line, designed specifically for firmware storage in systems where code immutability, radiation tolerance, and JEDEC-standard pin compatibility are mandatory - not for general-purpose memory or reprogrammable applications.
FAQ
What is the maximum read access time specified for AT27C4096-90JU-T?
The AT27C4096-90JU-T has a maximum read access time of 90ns under industrial temperature conditions (–40°C to +85°C) and 5V ±10% supply. This value is measured from address valid or CE/OE assertion to valid data output, per Table 5-4 in the official datasheet. The "-90" suffix explicitly denotes this timing grade, distinguishing it from the faster -55 variant.
Does AT27C4096-90JU-T require a programming voltage during normal operation?
No, AT27C4096-90JU-T operates solely from a 5V ±10% supply during read mode. VPP (12.0V ±0.5V) is required only during programming and must be applied simultaneously with or after VCC. During normal system operation, VPP may be tied to VCC or left unconnected depending on board-level design - but never floated. The AT27C4096-90JU-T draws zero programming current in read mode.
Is AT27C4096-90JU-T pin-compatible with AT27C2048-90JU?
Yes, AT27C4096-90JU-T and AT27C2048-90JU share identical 44-lead PLCC packaging, pinout, and signal definitions (A0–A17, O0–O15, CE, OE, VCC, GND, VPP, NC). However, AT27C4096-90JU-T uses A17 as the most significant address bit, while AT27C2048-90JU terminates at A16 - meaning A17 must be held high or low per system decode logic to avoid unintended addressing beyond 128K words.
What decoupling capacitors are required for stable operation of AT27C4096-90JU-T?
Per Atmel's system considerations, each AT27C4096-90JU-T requires a 0.1µF ceramic capacitor placed between VCC and GND, mounted as close to the device as possible. For boards with multiple EPROMs, a 4.7µF bulk electrolytic capacitor must also be added near the power entry point. These values ensure transient suppression during CE-driven standby-to-active transitions and maintain VCC stability within datasheet limits.
How does the integrated product identification code function in AT27C4096-90JU-T?
The AT27C4096-90JU-T contains a hard-coded manufacturer ID (001Eh) and device code (00F4h) accessible by setting A9 to 11.5–12.5V (VID) and toggling A0 between low and high while holding all other address lines low. This feature allows automated programming equipment to verify part identity before applying VPP, preventing misprogramming. The AT27C4096-90JU-T ID code is electrically distinct from AT27C2048 and AT27C1024.
AT27C4096-90JU-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:
- 90 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)
AT27C4096-90JU-T FAQ
1.How can I place an order for AT27C4096-90JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-90JU-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 AT27C4096-90JU-T reliable?
The price and inventory of AT27C4096-90JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-90JU-T is usually 5 days.
3.What payment methods are accepted for AT27C4096-90JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-90JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-90JU-T?
AT27C4096-90JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-90JU-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 AT27C4096-90JU-T?
For technical support, including AT27C4096-90JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-90JU-T requirements.
6.How does Aetrix verify that AT27C4096-90JU-T is sourced from the original manufacturer or authorized distributors?
All AT27C4096-90JU-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 AT27C4096-90JU-T meets industry standards.
7.What is the process for return or replacement of AT27C4096-90JU-T?
All AT27C4096-90JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-90JU-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 AT27C4096-90JU-T part is unused and in its original packaging.
Return procedure for AT27C4096-90JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C4096-90JU-T 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…
