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Microchip Technology AT25320B-SSHL-T
- Part No.:
- AT25320B-SSHL-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25320B-SSHL-T.pdf
- Description:
- IC EEPROM 32KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,104
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Product details
Overview
AT25320B-SSHL-T from Microchip Technology (formerly Atmel) is a 32-kbit SPI serial EEPROM organized as 4,096 × 8-bit memory array, operating from 1.8V to 5.5V with 20MHz max clock rate at 5V, 32-byte page write capability, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in industrial microcontroller systems requiring low-power, robust data retention.
For engineers reviewing the AT25320B-SSHL-T datasheet, AT25320B-SSHL-T pinout, AT25320B-SSHL-T application, or AT25320B-SSHL-T equivalent, this page delivers verified electrical specs, JEDEC SOIC-8 package details, SPI Mode 0/3 compatibility, 100-year data retention, and real-world use cases in embedded control and sensor calibration.
Technical Context
The AT25320B-SSHL-T implements a synchronous SPI slave interface with separate SI (input) and SO (output) pins, supporting both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), though datasheet characterization focuses on Mode 0 operation. It features an 8-bit instruction register for opcodes including WREN, WRDI, RDSR, WRSR, READ, and WRITE.
Internal architecture includes a 4,096-word memory array, address decoder, status register with BP0/BP1 block protection bits and WPEN enable bit, and self-timed write cycle logic. The HOLD pin suspends ongoing serial communication without resetting the sequence, while CS enables device selection and SO enters high-impedance state when deselected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32,768 bits (4,096 × 8-bit words) - fixed capacity for compact firmware parameter storage |
| Supply Voltage Range | 1.8V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifting |
| Max Clock Frequency | 20 MHz at VCC = 5.0V - enables fast read/write throughput in high-speed host systems |
| Page Write Size | 32 bytes per page - reduces write transaction overhead versus byte-wise programming |
| Write Cycle Time | 5 ms maximum - deterministic erase-and-program time enabling precise timing in real-time firmware |
| Data Retention | 100 years - ensures long-term reliability of calibration data and system settings across product lifetime |
| Endurance | 1,000,000 write cycles - supports frequent reconfiguration in field-upgradable devices |
Pinout & Package
AT25320B-SSHL-T is packaged in an 8-lead JEDEC SOIC (8S1), 0.15" wide, plastic gull-wing outline with NiPdAu lead finish, RoHS-compliant, rated for -40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; device ignores SI and drives SO high-Z when CS is high |
| SCK | Serial Clock Input | Host-generated clock synchronizing all SPI data transfers; supports up to 20 MHz at 5V |
| SI | Serial Data Input | Receives opcodes, addresses, and write data MSB-first; ignored during HOLD or when CS is high |
| SO | Serial Data Output | Drives read data MSB-first; enters high-impedance state when CS is high or during internal write |
| GND | Ground Reference | Primary return path for VCC and all I/O signals; must be low-impedance for noise immunity |
| VCC | Power Supply | Single supply input (1.8–5.5V); powers internal logic, memory array, and I/O buffers |
| WP | Write Protect | Hardware lock for status register writes when WPEN=1; prevents accidental configuration corruption |
| HOLD | Communication Suspend | Pauses active SPI transfer without resetting sequence; requires SCK low during assertion |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperates with diverse MCU families (e.g., 68HC11, ARM Cortex-M) without protocol translation |
| Block Write Protection | Configurable 0%, 25%, 50%, or 100% memory array lock via BP0/BP1 bits - secures boot code or calibration tables |
| Hardware + Software Write Protection | WP pin + WRSR instruction provide dual-layer defense against unintended writes during power transients or firmware bugs |
| Self-timed Write Cycle | No external erase command needed; internal timing eliminates host wait-state management overhead |
| Industrial Temperature Range | -40°C to +85°C operation - validated for deployment in factory automation, HVAC, and outdoor metering |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up and runtime parameter updates via SPI. Use Value: Ensures deterministic startup behavior and field-adjustable parameters without battery-backed SRAM or external backup power. |
Use Scenario: Retaining sensor offset/gain coefficients and patient-specific settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-critical calibration data, protected by WP pin and status register lock. Use Value: Meets IEC 62304 data integrity requirements with 100-year retention and 1M-cycle endurance for recalibration events. |
| Smart Energy Meter Firmware Parameters | Automotive Body Control Module Settings |
Use Scenario: Holding tariff schedules, pulse constants, and communication credentials in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: SPI-configurable memory accessed by metering SoC during initialization and over-the-air updates. Use Value: Enables secure, low-power parameter updates via isolated RS-485 or PLC interfaces without full firmware reloads. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive BCMs for personalized user experience. IC Role / Device Role / Timing Role: Low-voltage (1.8V–5.5V) EEPROM interfaced directly to 3.3V CAN microcontroller for infotainment-linked settings. Use Value: Survives automotive cold-crank conditions (down to 1.8V) and retains settings across battery disconnects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95320-DFMN6TP | 32Kb SPI EEPROM, 20MHz max @ 5V, but only 1.8–5.5V operation and no HOLD pin support | Lacks HOLD functionality - unsuitable where host must pause transfers mid-sequence | Select when HOLD is unused and cost sensitivity outweighs feature parity |
| CAT25320VI-GT3 | 32Kb SPI EEPROM with identical 8-lead SOIC package, 20MHz speed, and same 1.8–5.5V range; includes enhanced ESD protection (4kV HBM) | Higher ESD rating improves robustness in handheld or field-serviceable equipment | Prefer for designs exposed to frequent handling or uncontrolled ESD environments |
Compared with AT25320B-SSHL-T, M95320-DFMN6TP omits HOLD functionality critical for multi-master arbitration, while CAT25320VI-GT3 adds 4kV HBM ESD protection without sacrificing pinout or timing - making it ideal for portable instrumentation where electrostatic resilience is prioritized.
Availability
AT25320B-SSHL-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, and smart energy meters requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT25320B-SSHL-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 product support, documentation, and manufacturing continuity for the AT25xxx family.
The AT25320B-SSHL-T belongs to Microchip's legacy SPI serial EEPROM portfolio, designed specifically for reliable, low-power nonvolatile storage in resource-constrained embedded systems interfacing with 8-/16-/32-bit microcontrollers.
FAQ
What is the maximum clock frequency supported by AT25320B-SSHL-T?
The AT25320B-SSHL-T supports up to 20 MHz SCK frequency at VCC = 5.0V, 10 MHz at 2.5–5.5V, and 5 MHz at 1.8–5.5V per AC characteristics table. This allows high-throughput reads in 5V systems while maintaining compatibility with lower-voltage MCUs. The actual usable frequency depends on VCC level and board layout signal integrity.
Does AT25320B-SSHL-T require an external erase command before writing?
No, AT25320B-SSHL-T does not require a separate erase command. All programming cycles are self-timed and include automatic erase prior to write. After issuing a WRITE instruction and pulling CS high, the device internally erases and programs the target location within ≤5 ms - simplifying firmware implementation versus parallel EEPROMs.
How does the WP pin function in AT25320B-SSHL-T?
In AT25320B-SSHL-T, the WP pin protects the status register only when the WPEN bit is set to '1'. When WP is low and WPEN=1, writes to BP0, BP1, and WPEN are blocked - preventing accidental changes to write protection settings. If WPEN=0, the WP pin is ignored, allowing full status register access even with WP grounded.
Can AT25320B-SSHL-T operate reliably at 1.8V supply?
Yes, AT25320B-SSHL-T is fully specified for 1.8V to 5.5V operation, including DC and AC parameters. At 1.8V, it supports up to 5 MHz SCK, maintains 100-year data retention, and draws <0.1 μA standby current - making it suitable for battery-powered IoT sensors and ultra-low-power wearables.
What package type is used in AT25320B-SSHL-T?
AT25320B-SSHL-T uses an 8-lead JEDEC SOIC package (8S1), 0.15" wide, with NiPdAu lead finish, green (Pb/Halide-free/RoHS-compliant) construction, and industrial temperature rating (-40°C to +85°C). Pin 1 is marked with a notch or dot per standard SOIC conventions.
AT25320B-SSHL-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25320B-SSHL-T FAQ
1.How can I place an order for AT25320B-SSHL-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320B-SSHL-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 AT25320B-SSHL-T reliable?
The price and inventory of AT25320B-SSHL-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25320B-SSHL-T is usually 5 days.
3.What payment methods are accepted for AT25320B-SSHL-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320B-SSHL-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320B-SSHL-T?
AT25320B-SSHL-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320B-SSHL-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 AT25320B-SSHL-T?
For technical support, including AT25320B-SSHL-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320B-SSHL-T requirements.
6.How does Aetrix verify that AT25320B-SSHL-T is sourced from the original manufacturer or authorized distributors?
All AT25320B-SSHL-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 AT25320B-SSHL-T meets industry standards.
7.What is the process for return or replacement of AT25320B-SSHL-T?
All AT25320B-SSHL-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25320B-SSHL-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 AT25320B-SSHL-T part is unused and in its original packaging.
Return procedure for AT25320B-SSHL-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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