My Inquiry
My Account
Microchip Technology AT28HC256E-12JU-070
- Part No.:
- AT28HC256E-12JU-070
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT28HC256E-12JU-070.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,871
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT28HC256E-12JU-070 from Microchip Technology is a military-grade 256-Kbit (32,768 × 8) paged parallel EEPROM with 120 ns read access time, 10 ms maximum page write cycle time, and full operation across –55°C to +125°C. It features hardware/software data protection, DATA polling for write completion detection, and JEDEC-standard byte-wide pinout. It serves as nonvolatile program/data storage in avionics control modules requiring high reliability and radiation-tolerant memory.
For engineers reviewing the AT28HC256E-12JU-070 datasheet, AT28HC256E-12JU-070 pinout, AT28HC256E-12JU-070 application, or AT28HC256E-12JU-070 equivalent, this page delivers verified military-spec timing, endurance (100,000 cycles), power behavior (3 mA CMOS standby), package mapping (32-lead CERDIP), and real-world substitution guidance - all confirmed against Microchip DS20006352A.
Technical Context
The AT28HC256E-12JU-070 implements a paged architecture with an internal 64-byte latch enabling simultaneous writes of 1–64 bytes per cycle. Its dual-line chip enable (CE) and output enable (OE) logic supports bus contention avoidance in multiprocessor systems, while VCC sense and noise filtering prevent spurious writes during power transients.
It uses CMOS-compatible TTL-level I/Os, operates from a single 5V ±10% supply, and integrates internal error correction for extended data retention (10 years). The device supports optional 12V-based chip erase and identification memory (64 bytes at 7FC0H–7FFFH), accessible via A9 = 12V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32,768 × 8), directly replaceable for SRAM-like read/write interface without external timing logic |
| Read access time | 120 ns max - meets MIL-STD-883 Class B timing for real-time embedded firmware fetch |
| Page write cycle | 10 ms max - enables burst configuration storage in flight control computers with deterministic latency |
| Endurance | 100,000 write/erase cycles - validated for mission-critical reprogramming in field-deployed systems |
| Operating temperature | –55°C to +125°C - qualified per MIL-PRF-38535 for extended-life aerospace and defense platforms |
| Supply voltage | 5V ±10% - compatible with legacy 5V military power buses without regulation overhead |
| Standby current | 300 µA CMOS mode - enables low-power dormant states in battery-backed telemetry recorders |
Pinout & Package
AT28HC256E-12JU-070 is packaged in a 32-lead CERDIP (Ceramic Dual Inline Package), hermetically sealed per MIL-STD-1835 D-10 Config A, with 0.600" width and glass-sealed construction for moisture resistance and thermal stability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus supporting full 32K-word addressing; A6–A14 define page boundaries for 64-byte page writes |
| I/O0–I/O7 | Bidirectional data bus | CMOS/TTL-compatible 8-bit parallel interface; I/O7 provides DATA polling status, I/O6 toggles during write cycles |
| CE | Chip Enable | Active-low primary selection signal; must be low with OE low and WE high for read access |
| OE | Output Enable | Active-low output gate; high-Z state when high prevents bus contention in shared-memory architectures |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; supports both byte and page write initiation |
| VCC / GND | Power / Ground | Single 5V supply rail; ground reference for all I/O and internal logic - decoupling required per MIL-STD-1399 |
| NC / DC | No Connect / Don't Connect | Pins 12 and 26 (CLCC) or pins labeled DC are unconnected - must remain floating per datasheet layout rules |
Key Features
| Feature | Design Value |
|---|---|
| Hardware data protection | VCC sense (inhibit below 3.8V), 5 ms power-on delay, and 15 ns noise filtering on CE/WE prevent unintended writes during brownout or EMI events |
| Software data protection (SDP) | Three-step command sequence (AAh/55h/A0h) enables/disables write lock; remains active through power cycles and protects entire array |
| Page write capability | Internal 64-byte latch allows up to 64 bytes to be loaded within 150 µs window - reduces host CPU overhead vs. sequential byte writes |
| Write completion detection | DATA polling (I/O7 complement → true data) and Toggle Bit (I/O6 toggling → stable) provide two independent, software-accessible status methods |
| Military-grade packaging | 32-lead CERDIP with glass seal and MIL-STD-1835 compliance ensures mechanical robustness, hermeticity, and thermal cycling survivability |
Applications
| Avionics Flight Control Memory | Tactical Radio Firmware Storage |
|---|---|
|
Use Scenario: Storing real-time calibration tables and flight envelope limits in F-16 digital flight control units (DFCU). IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via parallel bus during boot and in-flight reconfiguration; 120 ns read time supports deterministic loop timing. Use Value: 100,000-cycle endurance and –55°C to +125°C operation ensure reliable updates across 30-year airframe service life without field replacement. |
Use Scenario: Holding encrypted waveform definitions and channel maps in AN/PRC-160(V) manpack radios operating in desert environments. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for mission-critical firmware; SDP prevents accidental overwrite during hot-swap battery changes. Use Value: Hardware VCC sensing and 12V chip erase allow safe field reprogramming under variable input conditions and rapid secure erasure before equipment redeployment. |
| Missile Guidance System Boot ROM | Nuclear Submarine Sensor Calibration |
|
Use Scenario: Hosting boot loader and inertial navigation initialization code in Trident II D5 guidance electronics. IC Role / Device Role / Timing Role: Read-only execution memory mapped into processor address space; JEDEC pinout ensures drop-in compatibility with legacy SRAM-based designs. Use Value: 10-year data retention and radiation-hardened CMOS process eliminate need for periodic refresh or backup power - critical for sealed, long-dormant systems. |
Use Scenario: Storing pressure/temperature compensation coefficients for sonar transducer arrays in Virginia-class submarines. IC Role / Device Role / Timing Role: High-reliability parameter storage accessed during pre-dive system checkout; 300 µA standby current minimizes battery drain during months-long patrols. Use Value: Hermetic CERDIP package withstands 3000+ psi seawater pressure and thermal shock from deep-ocean thermal layers without leakage or parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28HC256-12JU | Commercial-grade version; same 120 ns speed and 32-lead CERDIP, but rated only for –40°C to +85°C | Lacks MIL-PRF-38535 qualification; unsuitable for flight-critical or naval deployments requiring extended temperature validation | Select only for cost-sensitive ground-test fixtures or non-mission-critical lab equipment where military temp range is unnecessary |
| DS2502-E48+T&R | 1-Wire serial EEPROM (48-bit ID + 1024-bit user memory); no parallel interface, no page write, 5V-only operation | Used for device authentication and small-parameter storage - not viable for firmware/code storage due to serial bandwidth and lack of random access | Choose only for asset tracking or simple calibration ID tagging; cannot substitute for AT28HC256E-12JU-070's parallel throughput or memory density |
Compared with AT28HC256-12JU, the AT28HC256E-12JU-070 adds full military temperature qualification and enhanced screening, while DS2502-E48+T&R trades parallel performance for minimal pin count and 1-Wire simplicity - neither offers direct functional or pin-for-pin equivalence.
Availability
AT28HC256E-12JU-070 is available at Aetrix Electronics and suitable for avionics control units, tactical radio firmware storage, missile guidance boot ROMs, and nuclear submarine sensor calibration requiring stable component supply across extended product lifecycles.
Supply support for AT28HC256E-12JU-070 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 is a global semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified operations and MIL-PRF-38535-qualified facilities.
The AT28HC256E-12JU-070 belongs to Microchip's military-grade parallel EEPROM product line, engineered specifically for high-reliability embedded systems where data integrity, long-term retention, and extreme environmental resilience are mandatory.
FAQ
What is the guaranteed minimum endurance rating for AT28HC256E-12JU-070?
The AT28HC256E-12JU-070 is specified for 100,000 write/erase cycles - a guaranteed minimum validated per MIL-STD-883 test method 1037. This endurance applies across the full military temperature range (–55°C to +125°C) and is documented in Microchip DS20006352A, Table 4-2. Each AT28HC256E-12JU-070 unit undergoes screening to meet this requirement.
Does AT28HC256E-12JU-070 support both byte and page write operations?
Yes, AT28HC256E-12JU-070 supports both byte and page write modes. Page write allows 1–64 bytes to be loaded within a 150 µs window (tBLC), followed by automatic internal programming. Byte write initiates a single-location update. Both modes use identical CE/OE/WE control logic and are fully supported in the AT28HC256E-12JU-070's hardware design per Section 6.8 of DS20006352A.
How is write completion detected on AT28HC256E-12JU-070?
AT28HC256E-12JU-070 provides two independent hardware methods: DATA polling (monitoring I/O7 for transition from complement to true data) and Toggle Bit (observing I/O6 toggling until it stabilizes). Both functions operate without halting the host processor and are electrically verified across –55°C to +125°C per DS20006352A Sections 6.14 and 6.16.
Is AT28HC256E-12JU-070 pin-compatible with standard 28-pin parallel EEPROMs?
No - AT28HC256E-12JU-070 uses a 32-lead CERDIP package with JEDEC-standard byte-wide pinout, differing from common 28-pin packages. Pin count, physical dimensions, and lead pitch are incompatible with 28-pin sockets. Direct replacement requires PCB redesign unless using an adapter board explicitly qualified for MIL-STD-1835 D-10 footprint alignment.
What voltage levels are required for software data protection on AT28HC256E-12JU-070?
Software data protection (SDP) on AT28HC256E-12JU-070 uses standard 5V logic levels for command entry (AAh/55h/A0h at addresses 5555h/2AAAh/5555h). No elevated voltage is needed for SDP enable/disable - unlike chip erase, which requires 12V on A9. All SDP sequences comply with standard 5V ±10% VCC operation as defined in DS20006352A Section 6.11.
AT28HC256E-12JU-070 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 10ms
- 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:
- 32-PLCC (13.97x11.43)
AT28HC256E-12JU-070 FAQ
1.How can I place an order for AT28HC256E-12JU-070 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28HC256E-12JU-070 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 AT28HC256E-12JU-070 reliable?
The price and inventory of AT28HC256E-12JU-070 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28HC256E-12JU-070 is usually 5 days.
3.What payment methods are accepted for AT28HC256E-12JU-070?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28HC256E-12JU-070 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28HC256E-12JU-070?
AT28HC256E-12JU-070 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28HC256E-12JU-070 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 AT28HC256E-12JU-070?
For technical support, including AT28HC256E-12JU-070 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28HC256E-12JU-070 requirements.
6.How does Aetrix verify that AT28HC256E-12JU-070 is sourced from the original manufacturer or authorized distributors?
All AT28HC256E-12JU-070 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 AT28HC256E-12JU-070 meets industry standards.
7.What is the process for return or replacement of AT28HC256E-12JU-070?
All AT28HC256E-12JU-070 units undergo pre-shipment inspection (PSI). If there is an issue with AT28HC256E-12JU-070, 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 AT28HC256E-12JU-070 part is unused and in its original packaging.
Return procedure for AT28HC256E-12JU-070:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28HC256E-12JU-070 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…
