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Microchip Technology AT25320B-SSHL-B
- Part No.:
- AT25320B-SSHL-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25320B-SSHL-B.pdf
- Description:
- IC EEPROM 32KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:304
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Product details
Overview
AT25320B-SSHL-B 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 controllers, sensor nodes, and power management systems.
For engineers reviewing the AT25320B-SSHL-B datasheet, AT25320B-SSHL-B pinout, AT25320B-SSHL-B application, or AT25320B-SSHL-B equivalent, key selection criteria include SPI Mode 0/3 compatibility, 100-year data retention, 1M write endurance, industrial temperature range (−40°C to +85°C), and JEDEC SOIC-8 green packaging with NiPdAu lead finish.
Technical Context
The AT25320B-SSHL-B implements a synchronous SPI slave interface with dedicated SI (input), SO (output), SCK (clock), CS (chip select), WP (write protect), and HOLD (communication suspend) pins. Its internal architecture includes an 8-bit instruction register, address decoder, status register with BP0/BP1/WPEN bits, and self-timed write logic eliminating external erase cycles.
Block write protection supports four configurations-none, 1/4-array (0xC00–0xFFF), 1/2-array (0x800–0xFFF), or full-array protection-programmable via WRSR instruction. The HOLD pin enables pause/resume of ongoing serial transfers without resetting the sequence, while WP provides hardware-level inhibition of status register writes when WPEN = 1 and WP = low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32,768 bits (4,096 × 8-bit words) - fixed organization for predictable addressing and byte-aligned access |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without level shifting |
| Max Clock Frequency | 20 MHz at VCC = 5V - supports high-speed configuration reads in time-critical boot sequences |
| Write Cycle Time | 5 ms maximum - defines minimum interval between successive write commands; no external delay required |
| Data Retention | 100 years - ensures long-term reliability for firmware parameters, calibration data, and device identity storage |
| Endurance | 1,000,000 write cycles - supports frequent field-updatable settings in telemetry and control applications |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded systems including motor drives and PLC modules |
Pinout & Package
AT25320B-SSHL-B is packaged in an 8-lead JEDEC SOIC (8S1) with 0.15" body width, NiPdAu lead finish, and RoHS-compliant green construction. Pin 1 is marked by a beveled corner or dot; package dimensions comply with MS-012, Variation AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; device ignores SI and tri-states SO when high - essential for multi-device SPI bus arbitration |
| SCK | Serial Clock | Master-generated clock input; timing-critical for setup/hold compliance - supports Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) |
| SI | Serial Data Input | MOSI path for opcodes, addresses, and write data - MSB-first transmission required per SPI protocol |
| SO | Serial Data Output | MISO path for read data and status register contents - high-impedance when CS is high or during HOLD assertion |
| GND | Ground Reference | Signal and power return plane - must be low-impedance connection to avoid noise-induced read errors |
| VCC | Power Supply | Single-supply input supporting 1.8V–5.5V operation - decoupling capacitor (0.1 µF) recommended near pin |
| WP | Write Protect | Hardware lock for status register writes when WPEN=1 - prevents accidental corruption of block protection settings |
| HOLD | Communication Suspend | Pauses active SPI transfer without resetting state machine - allows master to service higher-priority interrupts |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Compatibility | Interoperates with legacy 68HC11 and modern ARM Cortex-M SPI peripherals without mode reconfiguration |
| 32-byte Page Write | Reduces total programming time vs. byte-write by up to 32×; address auto-increment simplifies burst writes |
| Four-Level Block Protection | Enables selective lockdown of configuration sectors (e.g., protect calibration data while allowing runtime log updates) |
| Self-Timed Internal Write | Eliminates need for external write-cycle timers or polling overhead - RDSR bit 0 indicates completion |
| HOLD Pin Functionality | Preserves serial state during interrupt latency - avoids re-synchronization delays in real-time systems |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and sensor linearization tables in wireless temperature/humidity nodes. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed during power-up initialization and periodic self-test routines. Use Value: Ensures measurement accuracy across product lifetime using 100-year retention and 1M-cycle endurance for recalibration events. |
Use Scenario: Holding user-selectable therapy modes, alarm thresholds, and audit logs in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration memory with hardware write protection preventing unauthorized setting changes. Use Value: WP pin + BP bits enforce regulatory compliance by locking critical safety parameters while permitting logged event writes. |
| Smart Energy Metering | Automated Test Equipment (ATE) |
Use Scenario: Recording tariff schedules, meter ID, and firmware version in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: SPI-configurable memory interfaced directly with metrology SoC's serial peripheral. Use Value: 1.8V–5.5V operation allows shared supply with MCU; 20MHz clock supports fast firmware update verification. |
Use Scenario: Storing test pattern sets, fixture IDs, and pass/fail history in modular ATE controller boards. IC Role / Device Role / Timing Role: High-reliability storage for mission-critical test assets requiring guaranteed data integrity over 10+ years. Use Value: 1M write cycles support daily calibration updates; SO pin tri-state behavior prevents bus contention during parallel test execution. |
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, 2.5–5.5V supply, 20MHz max, SOIC-8, but lacks HOLD pin and uses different status register layout | No HOLD functionality limits use in interrupt-driven real-time systems; WP behavior differs (no WPEN bit) | Select when HOLD is unused and legacy STMicro design reuse is prioritized over Atmel-specific features |
| BR24G32FJ-3GE2 | 32Kb I²C EEPROM, 1.7–5.5V, 1MHz max, 8-pin TSSOP, integrated write protect, no SPI interface | I²C bus requires only two wires but imposes lower bandwidth; incompatible with SPI-only host controllers | Choose for space-constrained designs needing minimal pin count and where 1MHz I²C speed suffices |
Compared with M95320-DFMN6TP and BR24G32FJ-3GE2, AT25320B-SSHL-B uniquely combines SPI Mode 0/3 flexibility, HOLD pin for deterministic interrupt handling, and programmable block protection granularity - making it optimal for industrial hosts requiring robust, high-speed, and field-upgradable nonvolatile storage.
Availability
AT25320B-SSHL-B is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, smart metering, and test equipment requiring stable component supply across extended product lifecycles.
Supply support for AT25320B-SSHL-B 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 its legacy serial EEPROM portfolio with full technical and manufacturing continuity.
The AT25xxxB family was designed specifically for reliable, low-power, SPI-based nonvolatile storage in industrial and commercial systems where voltage flexibility, long data retention, and hardware-assisted write protection are mandatory.
FAQ
What is the maximum clock frequency supported by AT25320B-SSHL-B?
The AT25320B-SSHL-B supports up to 20 MHz SCK frequency at VCC = 5.0V. At lower voltages (1.8V–3.6V), the maximum rated frequency drops to 5 MHz per AC characteristics table. This ensures timing margin compliance across the full 1.8V–5.5V supply range, and all timing parameters (tSU, tH, tWH, etc.) are specified accordingly in the datasheet.
Does AT25320B-SSHL-B require an external erase cycle before writing?
No, AT25320B-SSHL-B does not require a separate erase cycle. All write operations - whether byte or page - are self-timed and internally managed. After issuing a WRITE instruction and pulling CS high, the device automatically performs erase-and-program in a single 5ms maximum cycle. The RDSR instruction (bit 0 = RDY) confirms completion before initiating subsequent commands.
How is write protection implemented on AT25320B-SSHL-B?
AT25320B-SSHL-B implements dual-layer write protection: hardware via the WP pin (when WPEN = 1 and WP = low) and software via status register bits BP0/BP1. These bits configure protection for none, 1/4, 1/2, or full memory array. The WP pin exclusively guards status register writes, while BP bits restrict writes to designated memory blocks - enabling fine-grained security for calibration or firmware data.
What package type does AT25320B-SSHL-B use?
AT25320B-SSHL-B uses an 8-lead JEDEC SOIC package (designated 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 identified by a beveled corner or dot, and the package conforms to MS-012, Variation AA mechanical standards.
Can AT25320B-SSHL-B operate with a 1.8V microcontroller?
Yes, AT25320B-SSHL-B is fully specified for 1.8V operation (VCC = 1.8V to 5.5V). At 1.8V, it supports up to 5 MHz SCK frequency and meets all DC/AC specifications including VOL2 ≤ 0.2V (IOL = 0.15mA) and VIH ≥ 1.26V. This enables direct interfacing with 1.8V FPGAs, ultra-low-power MCUs, and battery-powered edge sensors without level translation.
AT25320B-SSHL-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-B FAQ
1.How can I place an order for AT25320B-SSHL-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320B-SSHL-B 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-B reliable?
The price and inventory of AT25320B-SSHL-B 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-B is usually 5 days.
3.What payment methods are accepted for AT25320B-SSHL-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320B-SSHL-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320B-SSHL-B?
AT25320B-SSHL-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320B-SSHL-B 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-B?
For technical support, including AT25320B-SSHL-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320B-SSHL-B requirements.
6.How does Aetrix verify that AT25320B-SSHL-B is sourced from the original manufacturer or authorized distributors?
All AT25320B-SSHL-B 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-B meets industry standards.
7.What is the process for return or replacement of AT25320B-SSHL-B?
All AT25320B-SSHL-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25320B-SSHL-B, 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-B part is unused and in its original packaging.
Return procedure for AT25320B-SSHL-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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