My Inquiry
My Account
Microchip Technology AT25HP256-10PI-2.7
- Part No.:
- AT25HP256-10PI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25HP256-10PI-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 10MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,499
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT25HP256-10PI-2.7 from Atmel (now Microchip) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8-bit words, supporting 2.7V–5.5V operation, 5 MHz max clock at 2.7V, 128-byte page write mode, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in industrial microcontroller systems requiring low-power, reliable data retention.
For engineers reviewing the AT25HP256-10PI-2.7 datasheet, AT25HP256-10PI-2.7 pinout, AT25HP256-10PI-2.7 application, or AT25HP256-10PI-2.7 equivalent, key selection criteria include its 5 MHz SPI timing at 2.7V, 100K endurance cycles, >40-year data retention, 8-lead PDIP package with HOLD/CS/SO/SI/SCK/WP/GND/VCC interface, and block-protection granularity (1/4, 1/2, or full array).
Technical Context
The AT25HP256-10PI-2.7 operates exclusively as an SPI slave device with separate SI (input) and SO (output) pins, supporting only SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1). Its internal architecture includes a nonvolatile status register with BP0/BP1 bits for block protection and WPEN bit enabling hardware write protection via the WP pin.
All write operations require prior WREN instruction; no erase cycle is needed. Page writes are strictly 128-byte aligned-partial-page writes are not supported and may corrupt data. The HOLD pin suspends ongoing serial transfers without resetting the sequence, provided it is asserted while SCK is low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit words) |
| Supply Voltage Range | 2.7 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V microcontrollers without level shifting |
| Max SPI Clock Frequency | 5 MHz at 2.7 V - defines maximum sustained read/write throughput in low-voltage systems |
| Write Endurance | 100,000 cycles - supports frequent firmware parameter updates in field-deployed equipment |
| Data Retention | >40 years at +25°C - ensures long-term reliability for unattended industrial logging applications |
| Page Write Size | 128 bytes - requires host firmware to align writes to 128-byte boundaries for guaranteed integrity |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control environments |
Pinout & Package
AT25HP256-10PI-2.7 is packaged in an 8-lead PDIP (0.300" wide, package code 8P3), with lead pitch 2.54 mm and body width 7.62 mm. Pin 1 is marked by notch or dot; pin numbering follows standard DIP convention (counterclockwise from notch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: drives device into active state and initiates SPI command decoding on falling edge |
| SCK | Serial Clock Input | Synchronizes all SI/SO data transfers; must be stable during setup/hold windows per AC specs |
| SI | Serial Data Input | Receives op-codes, addresses, and write data MSB-first; ignored unless CS is low |
| SO | Serial Data Output | Drives read data MSB-first; enters high-impedance state when CS is high or HOLD is active |
| WP | Write Protect | Hardware lock: when WPEN=1 and WP=low, blocks all status register and protected memory writes |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter; requires SCK=low to assert/deassert |
| GND | Ground Reference | Return path for VCC and all I/O signals; must be low-impedance to minimize noise coupling |
| VCC | Power Supply | Primary power input; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte Page Write Mode | Enables efficient bulk programming with single CS assertion; eliminates need for per-byte write overhead |
| Block Write Protection | Configurable via status register to protect top 1/4, top 1/2, or entire memory array against accidental overwrite |
| Dual Write Protection | Combines hardware (WP pin) and software (WRSR/WREN) mechanisms for layered data security in safety-critical systems |
| HOLD Pin Functionality | Allows master MCU to temporarily halt EEPROM communication during interrupt service without losing byte alignment |
| Self-Timed Programming | No external timing control needed; internal logic manages tWC (10 ms max) and automatically returns to standby |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime parameter updates. Use Value: Ensures deterministic startup behavior and retains critical settings across power cycles and firmware upgrades without battery backup. |
Use Scenario: Holding sensor calibration coefficients, usage logs, and regulatory audit trails in portable diagnostic instruments with strict data integrity requirements. IC Role / Device Role / Timing Role: Secure, tamper-resistant data archive with hardware write protection enabled during normal operation. Use Value: Meets IEC 62304 traceability mandates by preventing unauthorized modification of calibration data post-certification. |
| Automotive Body Control Module | Smart Energy Meter Firmware Settings |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in automotive BCMs exposed to wide temperature swings. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced directly to 3.3 V MCU SPI bus with HOLD support for real-time interrupt handling. Use Value: Delivers guaranteed >40-year data retention at 85°C ambient, eliminating need for periodic refresh or redundant storage. |
Use Scenario: Storing tariff schedules, demand-response thresholds, and metering constants in utility-grade smart meters deployed in outdoor enclosures. IC Role / Device Role / Timing Role: Industrial-grade serial EEPROM with 100K write endurance to withstand daily firmware parameter updates over 10+ year lifespan. Use Value: Supports remote firmware reconfiguration via HAN interface while maintaining cryptographic key integrity through WP-enabled protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WDW6TP | 256 Kbit SPI EEPROM, 5 MHz @ 2.7V, but uses different status register layout and lacks HOLD pin | Requires firmware adaptation for protection control and no suspend capability during SPI transfers | Choose if HOLD functionality is unused and legacy ST-compatible register map is preferred |
| BR25H256FJ-2CE2 | 256 Kbit SPI EEPROM, 10 MHz @ 2.7V, built-in error correction (ECC), and extended −40°C to +105°C rating | Higher speed and enhanced reliability for automotive under-hood use; ECC adds fault tolerance for safety-critical data | Choose for AEC-Q100-compliant designs where radiation-induced bit flips are a concern |
Compared with M95256-WDW6TP and BR25H256FJ-2CE2, the AT25HP256-10PI-2.7 offers unique HOLD pin support for interrupt-safe SPI suspension and a proven industrial qualification profile, while trading off maximum clock speed and advanced ECC features for cost-sensitive, functionally mature deployments.
Availability
AT25HP256-10PI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT25HP256-10PI-2.7 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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT25HP256-10PI-2.7 belongs to Atmel's high-reliability SPI EEPROM product line, designed specifically for industrial and automotive applications demanding robust data retention, low-voltage operation, and flexible hardware/software write protection.
FAQ
What is the maximum SPI clock frequency supported by the AT25HP256-10PI-2.7 at 2.7 V?
The AT25HP256-10PI-2.7 supports up to 5 MHz SPI clock frequency when operated at 2.7 V. This value is specified in the AC Characteristics table under fSCK for the 2.7–5.5 V voltage range. Exceeding this limit risks read/write corruption due to violated setup/hold times, especially at temperature extremes.
Does the AT25HP256-10PI-2.7 support byte-level writes, or is it page-only?
The AT25HP256-10PI-2.7 supports only 128-byte page writes - byte-level writes are not functional. The datasheet explicitly states "128-byte Page Mode Only for Write Operations" and warns that partial-page writes may result in undefined data. Host firmware must buffer and align all writes to 128-byte boundaries.
How does the HOLD pin function during an active SPI transaction on the AT25HP256-10PI-2.7?
When the HOLD pin is pulled low while SCK is low during an active SPI transaction, the AT25HP256-10PI-2.7 immediately suspends communication: SO goes high-impedance, and SI inputs are ignored. The internal address counter and command state are preserved. Resuming requires bringing HOLD high while SCK remains low - the transaction continues from the exact bit position where it paused.
Can the AT25HP256-10PI-2.7 be used in a 1.8 V system?
No - the AT25HP256-10PI-2.7 is rated for 2.7 V to 5.5 V operation only. For 1.8 V systems, the pin-compatible AT25HP256-10PI-1.8 variant must be used. Using the -2.7 version below 2.7 V violates absolute maximum ratings and results in unreliable read/write behavior or complete failure to respond.
What protection levels are available via the Block Write Protection bits in the AT25HP256-10PI-2.7 status register?
The AT25HP256-10PI-2.7 supports four block protection levels via BP1/BP0 bits: none (00), top 1/4 (01 → addresses 0x6000–0x7FFF), top 1/2 (10 → 0x4000–0x7FFF), or full array (11 → 0x0000–0x7FFF). These are nonvolatile settings written via WRSR instruction and remain active after power cycling.
AT25HP256-10PI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25HP256-10PI-2.7 FAQ
1.How can I place an order for AT25HP256-10PI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25HP256-10PI-2.7 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 AT25HP256-10PI-2.7 reliable?
The price and inventory of AT25HP256-10PI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25HP256-10PI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25HP256-10PI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25HP256-10PI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25HP256-10PI-2.7?
AT25HP256-10PI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25HP256-10PI-2.7 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 AT25HP256-10PI-2.7?
For technical support, including AT25HP256-10PI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25HP256-10PI-2.7 requirements.
6.How does Aetrix verify that AT25HP256-10PI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25HP256-10PI-2.7 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 AT25HP256-10PI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25HP256-10PI-2.7?
All AT25HP256-10PI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25HP256-10PI-2.7, 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 AT25HP256-10PI-2.7 part is unused and in its original packaging.
Return procedure for AT25HP256-10PI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25HP256-10PI-2.7 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…
