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Microchip Technology AT25320W-10SC
- Part No.:
- AT25320W-10SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25320W-10SC.pdf
- Description:
- IC EEPROM 32KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,730
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Product details
Overview
AT25320W-10SC from Atmel (now Microchip Technology) is a 32-Kbit SPI serial EEPROM organized as 4096 × 8-bit words, supporting 1.8V–5.5V operation, 3.0 MHz clock rate at 5V, and 32-byte page write mode. It features hardware/software write protection via WP pin and status register, self-timed 5 ms typical write cycle, and is rated for one million write cycles with 100-year data retention - deployed in industrial control modules requiring nonvolatile parameter storage.
For engineers reviewing the AT25320W-10SC datasheet, AT25320W-10SC pinout, AT25320W-10SC application, or AT25320W-10SC equivalent, key selection criteria include voltage range compatibility (1.8V/2.7V), SPI Mode 0/3 support, block write protection granularity (1/4, 1/2, full array), HOLD functionality for interrupt-safe communication, and JEDEC SOIC-8 package footprint alignment with legacy board designs.
Technical Context
The AT25320W-10SC operates as a slave device on a 3-wire SPI bus (CS, SCK, SI/SO), with separate input (SI) and output (SO) pins enabling full-duplex command/data flow. Its instruction set includes WREN/WRDI for write enable/disable control, RDSR/WRSR for status register access and configuration, and READ/WRITE for memory access - all MSB-first with op-code-driven execution initiated by CS falling edge.
Block write protection is implemented via two nonvolatile BP0/BP1 bits in the status register, allowing selective locking of 0%, 25%, 50%, or 100% of the memory array (e.g., BP1=1, BP0=1 protects addresses 0000–0FFFh). The WP pin provides hardware-level inhibition of status register writes when WPEN=1 and WP is low, while HOLD suspends ongoing serial transfers without resetting internal address counters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit words) - supports firmware parameter logging and calibration storage in resource-constrained microcontroller systems. |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with both low-power IoT sensors (1.8V) and legacy 5V industrial controllers without level-shifting. |
| Max Clock Frequency | 3.0 MHz at VCC = 5.0V - delivers ~384 KB/s effective throughput in page write mode, suitable for burst configuration updates. |
| Write Cycle Time | 5 ms typical (10 ms max) - enables deterministic timing budgeting for real-time systems where EEPROM write latency must be bounded. |
| Endurance & Retention | 1 million write cycles / 100 years data retention - meets long-life requirements for utility metering, medical device calibration, and automotive ECU configuration storage. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade deployment in factory automation, motor drives, and outdoor telemetry units. |
| SPI Compatibility | Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1) - ensures interoperability with diverse MCU families including PIC, AVR, ARM Cortex-M, and legacy 68HC11 derivatives. |
Pinout & Package
AT25320W-10SC is supplied in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide body, with 1.27 mm pitch. Pin 1 is marked by notch or dot; leads are gull-wing shaped, compliant with IPC-7351A standard for surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire SPI transaction; high impedance SO output when CS is high. |
| SCK | Serial Clock | Input-only clock synchronized to master; defines timing for SI sampling and SO output transitions per SPI mode. |
| SI | Serial Data Input | Command/op-code, address, and write data input path; ignored during HOLD or when CS is high. |
| SO | Serial Data Output | Read data and status register output; tri-stated when CS is high or HOLD is active. |
| WP | Write Protect | Hardware lock for status register writes when WPEN=1; no effect on unprotected memory writes unless BP bits are set. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter; requires SCK low during assertion/deassertion. |
| VCC | Power Supply | Single supply input (1.8–5.5V); decoupling capacitor (0.1 µF) required within 10 mm of pin per layout guidelines. |
| GND | Ground Reference | Return path for all I/O and power currents; must be connected to system ground plane with low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte Page Write Mode | Enables efficient multi-byte programming with single CS pulse; reduces total write time vs. byte-by-byte writes by up to 97%. |
| Four-Level Block Protection | BP0/BP1 bits allow precise lockdown of 0%, 25%, 50%, or 100% of memory - critical for safeguarding bootloader sections or regulatory-critical calibration data. |
| Independent Hardware/Software Write Control | WP pin blocks status register writes while WREN/WRDI instructions manage volatile write-enable latch - layered security against accidental overwrites. |
| HOLD Functionality | Permits interruption of serial transfers (e.g., during MCU interrupt servicing) without losing sequence state or requiring re-initialization. |
| Low Standby Current | 0.1 µA typical at 1.8V - extends battery life in always-on sensor nodes and portable diagnostic tools. |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and fault log history in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during boot and runtime reconfiguration; HOLD used during watchdog-triggered resets. Use Value: Enables field-upgradable control logic without EEPROM replacement; 1M endurance supports >10 years of daily parameter updates in continuous operation. | Use Scenario: Retaining seat position presets, mirror angle offsets, and lighting profiles in automotive BCMs subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: SPI-connected parameter store interfaced to 8-bit MCU; WP pin tied to chassis ground for permanent protection of factory-calibrated values. Use Value: Prevents corruption of safety-critical settings during vehicle jump-start events or ESD transients due to hardware-enforced write blocking. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Holding dose calibration coefficients, pump motor timing offsets, and usage audit logs in Class II medical devices requiring FDA-compliant data integrity. IC Role / Device Role / Timing Role: Secure memory node accessed only after cryptographic authentication; RDSR polling confirms write completion before power-down. Use Value: Meets IEC 62304 requirement for verified nonvolatile storage with 100-year retention - eliminates recalibration drift over product lifetime. | Use Scenario: Storing firmware patch images and decryption keys in ANSI C12.22-compliant smart meters deployed in utility substations. IC Role / Device Role / Timing Role: Dual-role memory: holds encrypted patch payload (read-only post-authentication) and unencrypted metadata (write-enabled via WREN). Use Value: Supports secure over-the-air updates with atomic write verification - tWC ≤ 10 ms allows patch commit within 50 ms power-fail window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95320-WMN6TP | STMicroelectronics 32-Kbit SPI EEPROM; identical 8-lead SOIC package, same 1.8–5.5V range, but supports 20 MHz max clock and 5 ms write cycle; uses different status register bit layout (SRWD instead of WPEN). | Higher-speed SPI interface suits applications needing faster configuration loads; SRWD-based protection differs in initialization sequence and lock behavior. | Select M95320-WMN6TP when system clock exceeds 3 MHz or when ST's enhanced error-detection features (ECC on status register) are required. |
| BR24T32FJ-WE2 | Rohm 32-Kbit SPI EEPROM; 8-lead TSSOP package (not SOIC), 1.7–5.5V range, 10 MHz max clock, 5 ms write cycle; includes built-in write protect timer and automatic address increment mode. | TSSOP footprint requires PCB redesign; timer-based WP adds delay-based security layer not present in AT25320W-10SC. | Choose BR24T32FJ-WE2 for new designs prioritizing ultra-low power (0.5 µA standby) and advanced write-lock sequencing, accepting package change. |
Compared with M95320-WMN6TP and BR24T32FJ-WE2, the AT25320W-10SC offers proven JEDEC SOIC-8 compatibility and deterministic 3 MHz timing for legacy industrial interfaces, while trading off maximum speed and advanced protection features for broad MCU driver support and minimal layout impact.
Availability
AT25320W-10SC is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, medical device calibration storage, and smart metering applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT25320W-10SC 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 for industrial, automotive, and consumer markets.
The AT25xxx family was designed specifically for robust, low-voltage SPI EEPROM applications in harsh environments - emphasizing reliability, flexible voltage operation, and hardware-assisted data integrity for embedded systems with constrained resources.
FAQ
What is the exact memory organization of the AT25320W-10SC?
The AT25320W-10SC contains 32,768 bits of serial EEPROM memory, organized as 4096 words × 8 bits each. This structure supports byte-aligned read/write operations across the full address space 0000h–0FFFh. The device uses a 12-bit internal address counter, with the five LSBs auto-incremented during page write mode to enable 32-byte burst writes without external address management.
Does the AT25320W-10SC support both 1.8V and 2.7V minimum supply voltages simultaneously?
No - the AT25320W-10SC is a single-part-number variant specified for 2.7V to 5.5V operation (denoted by "-2.7" suffix). While the broader AT25320 family includes -1.8 variants, the AT25320W-10SC itself is not rated below 2.7V. Attempting operation at 1.8V may result in unreliable read/write behavior or failure to execute WREN commands.
How does the HOLD function interact with the AT25320W-10SC's internal write cycle?
The HOLD pin has no effect during an active internal write cycle (tWC). Once a WRITE instruction completes and CS goes high, the device enters self-timed programming - during this phase, HOLD is ignored and only RDSR commands are accepted. HOLD is functional only during active SPI transactions (CS low) prior to write initiation or during read sequences.
Can the AT25320W-10SC be used as a direct replacement for the AT25320N-10SI-2.7?
Yes - AT25320W-10SC and AT25320N-10SI-2.7 share identical electrical specifications, pinout, package (8-lead JEDEC SOIC), and timing characteristics. The "W" and "N" suffixes denote tape-and-reel packaging variants (wide vs. narrow carrier tape), not functional differences. Both comply with the same 0675M–SEEPR–9/03 datasheet revision.
What happens if the WP pin is held low while the WPEN bit is '0' in the AT25320W-10SC status register?
When WPEN = 0, the WP pin is disabled regardless of its logic level. Holding WP low under this condition has no effect on write operations - the device permits full read/write access to memory and status register. This design allows safe installation in systems where WP is hardwired to ground, provided WPEN is cleared during initial programming to retain configurability.
AT25320W-10SC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25320W-10SC FAQ
1.How can I place an order for AT25320W-10SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320W-10SC 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 AT25320W-10SC reliable?
The price and inventory of AT25320W-10SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25320W-10SC is usually 5 days.
3.What payment methods are accepted for AT25320W-10SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320W-10SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320W-10SC?
AT25320W-10SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320W-10SC 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 AT25320W-10SC?
For technical support, including AT25320W-10SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320W-10SC requirements.
6.How does Aetrix verify that AT25320W-10SC is sourced from the original manufacturer or authorized distributors?
All AT25320W-10SC 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 AT25320W-10SC meets industry standards.
7.What is the process for return or replacement of AT25320W-10SC?
All AT25320W-10SC units undergo pre-shipment inspection (PSI). If there is an issue with AT25320W-10SC, 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 AT25320W-10SC part is unused and in its original packaging.
Return procedure for AT25320W-10SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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