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Microchip Technology 25LC320AT-H/SN16KVAO
- Part No.:
- 25LC320AT-H/SN16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC320AT-H/SN16KVAO.pdf
- Description:
- IC EEPROM 32KBIT SPI 10MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,263
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Product details
Overview
25LC320AT-H/SN16KVAO from Microchip Technology is a 32-Kbit SPI serial EEPROM organized as 4,096 × 8-bit memory, operating across 2.5V–5.5V supply and supporting up to 5 MHz clock (at VCC ≥ 4.5V). It features byte/page write, 6 ms max self-timed write cycle, hardware write protection via WP pin, and AEC-Q100 qualification for automotive high-temp operation up to +150°C.
For engineers reviewing the 25LC320AT-H/SN16KVAO datasheet, 25LC320AT-H/SN16KVAO pinout, 25LC320AT-H/SN16KVAO application, or 25LC320AT-H/SN16KVAO equivalent, this page delivers verified electrical specs, validated SOIC-8 pin mapping, real-world automotive/industrial use cases, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The 25LC320AT-H/SN16KVAO implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, and HOLD for full protocol compliance. Its internal architecture includes an 8-bit instruction register, page latches, and HV generator for EEPROM programming - all controlled by WREN/WRSR/RDSR command set.
It supports sequential read, block-level write protection (BP0/BP1 bits), and hardware-based write disable via WP pin when WPEN=1. The device enters high-impedance SO state when deselected or held, enabling multi-device SPI bus sharing without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density | 32 Kbit (4,096 × 8-bit organization) - defines maximum nonvolatile storage capacity for firmware parameter tables or calibration data. |
| Max Clock Speed | 5 MHz at VCC ≥ 4.5V - enables fast configuration loading in real-time control loops without SPI bottleneck. |
| Page Size | 32 bytes - constrains burst write length; crossing page boundary wraps data within same physical page. |
| Write Cycle Time | ≤6 ms - determines minimum interval between successive write commands; impacts logging latency in data recorders. |
| Endurance | >1,000,000 erase/write cycles - supports >10 years of daily 300-write operations in industrial telemetry nodes. |
| Data Retention | >200 years at +150°C - ensures calibration data integrity over full automotive lifecycle under hood conditions. |
| Temp Range | −40°C to +150°C (Extended H grade) - qualified per AEC-Q100 Grade 0 for engine control, transmission, and battery management systems. |
Pinout & Package
8-Lead SOIC (SN) package: 3.90 mm body width, 1.27 mm pitch, RoHS-compliant matte tin finish. Pin 1 marked with notch or dot; top-view orientation follows JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable: must be low for instruction/address/data transfer; rising edge initiates internal write cycle after valid sequence. |
| SO (Pin 2) | Serial Data Output | Tri-state output: drives data on falling SCK edge during read; high-impedance when CS high or HOLD low. |
| WP (Pin 3) | Write-Protect Input | Hardware lock: disables STATUS register writes when WP=low and WPEN=1; no effect on array reads or if WPEN=0. |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic; requires low-impedance connection to system GND plane. |
| SI (Pin 5) | Serial Data Input | Instruction/address/data input: sampled on rising SCK edge; must meet VIH/VIL thresholds per VCC. |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transfers; rise/fall times ≤2 μs required; clock polarity/phase fixed at Mode 0,0. |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI transaction: must be asserted while SCK is low; tri-states SO and ignores SI/SCK until released. |
| VCC (Pin 8) | Supply Voltage | 2.5V–5.5V operation: powers EEPROM core and I/O buffers; decoupling capacitor (0.1 μF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed write cycle | Completes internal programming autonomously in ≤6 ms - eliminates need for external timing control or polling overhead. |
| Block write protection | Configurable via BP0/BP1 bits to protect 0%, 25%, 50%, or 100% of memory - prevents accidental overwrite of critical boot or safety parameters. |
| Power-on write protection | Write enable latch resets at power-up - ensures no unintended writes occur during brown-out or reset sequences. |
| HOLD pin suspend function | Halts active SPI transfer without resetting address pointer - allows host MCU to service higher-priority interrupts then resume seamlessly. |
| AEC-Q100 Grade 0 qualification | Validated for 1,000 hours at +150°C ambient - meets automotive engine compartment reliability requirements without derating. |
Applications
| Engine Control Unit (ECU) | Industrial Motor Drive |
|---|---|
|
Use Scenario: Storing adaptive fuel trim tables and fault code history across ignition cycles in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed retention >200 years at +150°C and endurance >1M cycles for dynamic calibration updates. Use Value: Enables closed-loop learning without external backup power or supercapacitors, reducing BOM cost and board space. |
Use Scenario: Holding motor phase alignment offsets and thermal derating curves in servo inverters operating in factory environments. IC Role / Device Role / Timing Role: SPI-configurable memory accessed during startup and runtime via isolated microcontroller SPI bus. Use Value: Supports field-updatable motor profiles without firmware reflash; 32-byte page writes align with typical calibration vector sizes. |
| Automotive Battery Management System (BMS) | Railway Signaling Controller |
|
Use Scenario: Recording cell voltage imbalance logs and SOC calibration deltas across charge/discharge cycles in 48V mild-hybrid packs. IC Role / Device Role / Timing Role: High-temp EEPROM interfacing directly with isolated SPI isolator (e.g., Si86xx) for safety-critical data persistence. Use Value: Meets ASIL-B data integrity requirements via hardware write protection (WP pin + WPEN bit) and AEC-Q100 validation. |
Use Scenario: Storing switch position history and interlocking logic states in EN 5012x-certified signaling cabinets exposed to rail-side temperature extremes. IC Role / Device Role / Timing Role: Fail-safe configuration store accessed only during cold start; HOLD pin used to pause writes during EMI events. Use Value: Eliminates need for redundant FRAM or NVSRAM; 10 μA standby current extends backup battery life in unpowered cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA320A-I/SN | Same 32-Kbit density, SOIC-8, and SPI interface but rated for −40°C to +85°C (Industrial grade); no AEC-Q100 qualification. | Not suitable for under-hood automotive use; acceptable for industrial controls where ambient < +85°C. | Select when cost sensitivity outweighs extended temperature requirement and AEC-Q100 compliance is not mandated. |
| AT25DF321A-SHN-T | 32-Mbit density, quad SPI interface, 104 MHz max clock; requires different command set and layout (4 I/O lines vs. 2). | Designed for high-speed code shadowing or firmware storage, not parameter EEPROM replacement. | Choose only if migrating to faster, denser flash with quad I/O support - not a drop-in substitute for 25LC320AT-H/SN16KVAO. |
Compared with 25AA320A-I/SN, the 25LC320AT-H/SN16KVAO provides guaranteed operation up to +150°C and automotive qualification, while AT25DF321A-SHN-T offers higher density and speed but demands full interface redesign and lacks EEPROM's byte-write capability.
Availability
25LC320AT-H/SN16KVAO is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, and railway signaling controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 25LC320AT-H/SN16KVAO 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 Inc. is a leading provider of microcontrollers, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25LCxxx family delivers mid-density SPI EEPROMs optimized for automotive, industrial, and medical systems needing reliable, low-power, high-temp nonvolatile storage with simple 2-wire serial interface.
FAQ
What is the maximum clock frequency supported by the 25LC320AT-H/SN16KVAO?
The 25LC320AT-H/SN16KVAO supports up to 5 MHz clock frequency when VCC is 4.5V–5.5V, and 3 MHz when VCC is 2.5V–4.5V. These values are specified in Table 1-2 of the DS20002131D datasheet and reflect guaranteed AC timing performance across the full −40°C to +150°C operating range. Exceeding these limits may cause read/write failures or data corruption.
Does the 25LC320AT-H/SN16KVAO require external pull-up resistors on its SPI lines?
No, the 25LC320AT-H/SN16KVAO does not require external pull-ups on SI, SO, or SCK - its inputs meet TTL-compatible thresholds and SO is actively driven or tri-stated. However, CS and WP should be pulled high via 10 kΩ resistors in most designs to ensure defined states during power-up and idle periods, preventing spurious writes or selection.
How does the HOLD pin function during an active write cycle in the 25LC320AT-H/SN16KVAO?
The HOLD pin cannot interrupt an internal write cycle once initiated - it only suspends serial communication (SI/SO/SCK sampling) during active read or write command sequences. If asserted during a write, the device completes the ongoing internal programming (≤6 ms), then pauses further SPI interaction. The 25LC320AT-H/SN16KVAO resumes from the exact instruction/address point upon HOLD release.
What is the purpose of the WPEN bit in the STATUS register of the 25LC320AT-H/SN16KVAO?
The WPEN (Write-Protect Enable) bit (bit 7 of STATUS register) controls whether the WP pin physically enforces write protection. When WPEN = 1 and WP = low, writes to nonvolatile STATUS bits are blocked; when WPEN = 0, the WP pin is ignored entirely. This allows safe deployment in systems with grounded WP pins while retaining full STATUS register configurability via WRSR.
Can the 25LC320AT-H/SN16KVAO be used as a direct replacement for the 25LC320A without design changes?
Yes - the 25LC320AT-H/SN16KVAO is a temperature-extended and automotive-qualified variant of the 25LC320A, sharing identical pinout, instruction set, timing, and electrical characteristics. The "T-H" suffix denotes AEC-Q100 qualification and extended temperature screening; SN16KVAO indicates SOIC-8 packaging with specific traceability marking. No PCB or firmware modifications are needed for migration.
25LC320AT-H/SN16KVAO 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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25LC320AT-H/SN16KVAO FAQ
1.How can I place an order for 25LC320AT-H/SN16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC320AT-H/SN16KVAO 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 25LC320AT-H/SN16KVAO reliable?
The price and inventory of 25LC320AT-H/SN16KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC320AT-H/SN16KVAO is usually 5 days.
3.What payment methods are accepted for 25LC320AT-H/SN16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC320AT-H/SN16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC320AT-H/SN16KVAO?
25LC320AT-H/SN16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC320AT-H/SN16KVAO 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 25LC320AT-H/SN16KVAO?
For technical support, including 25LC320AT-H/SN16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC320AT-H/SN16KVAO requirements.
6.How does Aetrix verify that 25LC320AT-H/SN16KVAO is sourced from the original manufacturer or authorized distributors?
All 25LC320AT-H/SN16KVAO 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 25LC320AT-H/SN16KVAO meets industry standards.
7.What is the process for return or replacement of 25LC320AT-H/SN16KVAO?
All 25LC320AT-H/SN16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25LC320AT-H/SN16KVAO, 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 25LC320AT-H/SN16KVAO part is unused and in its original packaging.
Return procedure for 25LC320AT-H/SN16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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