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Microchip Technology 25LC320A-H/SN16KVAO
- Part No.:
- 25LC320A-H/SN16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC320A-H/SN16KVAO.pdf
- Description:
- IC EEPROM 32KBIT SPI 10MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,775
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Product details
Overview
25LC320A-H/SN16KVAO from Microchip Technology Inc. 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 frequency. It features byte/page write, self-timed 6 ms max write cycles, hardware write protection via WP pin, and AEC-Q100 qualification for automotive high-temp environments (−40°C to +150°C). It serves as nonvolatile configuration storage in engine control units and battery management systems.
For engineers reviewing the 25LC320A-H/SN16KVAO datasheet, 25LC320A-H/SN16KVAO pinout, 25LC320A-H/SN16KVAO application, or 25LC320A-H/SN16KVAO equivalent, this page delivers verified electrical specs, SPI timing constraints, HOLD/CS interaction behavior, block protection mapping, and automotive-grade reliability metrics - all confirmed for the exact H-temp SN package variant.
Technical Context
The 25LC320A-H/SN16KVAO implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data-in) and SO (data-out) lines, requiring CS low, SCK synchronized rising-edge sampling, and HOLD-enabled pause/resume capability. Its internal architecture includes an 8-bit instruction register, status register with WIP/WEL/BP0/BP1 bits, and HV generator for EEPROM cell programming.
It supports four block protection levels (none, 1/4, 1/2, or full array) controlled by BP0/BP1 bits in the STATUS register, and integrates power-on data protection, write-enable latch reset on power-up/WRDI/WRSR/ WRITE completion, and ESD immunity >4 kV. All operations are validated across −40°C to +150°C ambient per AEC-Q100 stress testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density | 32 Kbit (4,096 × 8-bit organization) - defines maximum addressable storage for firmware parameters or calibration data. |
| Supply Voltage | 2.5V–5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level-shifting. |
| Max Clock Frequency | 5 MHz at VCC ≥ 4.5V; 3 MHz at 2.5V ≤ VCC < 4.5V - sets upper bound on SPI transaction throughput in real-time systems. |
| Page Size | 32 bytes - constrains burst-write length and requires software boundary checking to avoid wraparound corruption. |
| Write Cycle Time | ≤6 ms (self-timed) - determines minimum interval between successive write commands; no external delay required. |
| Endurance | >1,000,000 erase/write cycles - supports frequent field updates in telemetry loggers or adaptive control systems. |
| Data Retention | >200 years at +150°C - ensures long-term validity of stored calibration coefficients in under-hood automotive modules. |
| Temp Range | −40°C to +150°C (Extended H grade) - qualified per AEC-Q100 for engine bay, transmission, and powertrain applications. |
Pinout & Package
8-Lead SOIC (SN) package, 3.90 mm body width, RoHS-compliant matte tin finish, JEDEC MS-012AC compliant. Pin 1 marked with notch or dot; top-view orientation follows standard SOIC layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable: must be low for instruction/address/data transfer; high places SO in high-Z and enters Standby mode (10 μA ICCS). |
| SO (Pin 2) | Serial Data Output | Tri-state output delivering read data on SCK falling edge; goes high-Z when CS high or HOLD low. |
| WP (Pin 3) | Write-Protect Input | Hardware lock: disables STATUS register writes when WPEN=1 and WP=low; otherwise ignored. |
| VSS (Pin 4) | Ground Reference | Primary return path for all internal logic and EEPROM programming current; must be low-impedance. |
| SI (Pin 5) | Serial Data Input | Accepts instructions (e.g., 0x03 READ), addresses, and data on SCK rising edge; sampled only when CS=low. |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transfers; rising edge latches SI, falling edge updates SO; max 5 MHz rate. |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI sequence (e.g., mid-read) without resetting state; requires SCK=low before assertion. |
| VCC (Pin 8) | Supply Voltage | Power input for core logic and EEPROM programming; decoupling capacitor (0.1 μF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Capability | 32-byte pages allow efficient bulk configuration updates while avoiding cross-page boundary errors. |
| HOLD Functionality | Enables interrupt servicing during SPI transactions without reinitializing CS or losing address pointer state. |
| Block Protection Flexibility | BP0/BP1 bits support selective locking of upper 1/4, 1/2, or full memory - critical for safeguarding boot code. |
| Automotive Qualification | AEC-Q100 Grade 0 qualification (−40°C to +150°C) confirms suitability for powertrain and chassis ECUs. |
| Low-Power Standby | 10 μA ICCS at +150°C ensures minimal battery drain in always-on vehicle modules during sleep modes. |
| Hardware Write Protection | WP pin + WPEN bit provides dual-layer defense against accidental overwrites during system resets or noise events. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Storing fuel map calibration tables and fault codes that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed via SPI during boot and runtime diagnostics. Use Value: 200+ year data retention at +150°C ensures calibration integrity over vehicle lifetime without refresh. |
Use Scenario: Holding lens focus offset values and image sensor gamma curves updated during factory calibration. IC Role / Device Role / Timing Role: SPI-configurable parameter store with HOLD support for concurrent ISP interrupt handling. Use Value: 32-byte page writes reduce update time vs. byte-by-byte; AEC-Q100 compliance validates operation in camera housing near windshield heater. |
| Battery Management System (BMS) | Electric Power Steering (EPS) Controller |
Use Scenario: Recording cell voltage imbalance history and thermal derating thresholds for predictive maintenance. IC Role / Device Role / Timing Role: High-reliability event logger using sequential reads and protected write blocks for safety-critical thresholds. Use Value: >1M endurance supports daily logging over 10+ years; WP pin prevents corruption during CAN bus transients. |
Use Scenario: Storing torque assist profiles and motor phase alignment offsets that adapt to steering gear wear. IC Role / Device Role / Timing Role: Secure parameter vault with BP1/BP0 locking upper 1/2 of array to prevent unauthorized tuning. Use Value: 5 MHz SPI speed enables fast profile swaps during driver mode changes (Eco/Sport); H-grade temp range matches EPS under-hood placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC320AT-I/SN | Same density, page size, and pinout; rated for Industrial (−40°C to +85°C), not Extended H grade. | Lacks AEC-Q100 qualification and +150°C operation - unsuitable for under-hood automotive use. | Select only for cost-sensitive industrial controls where ambient stays below +85°C. |
| AT25DF321A-SHN-T | 32-Mbit (not 32-Kbit); quad SPI interface; different command set and 2.7–3.6V supply range. | Requires firmware rewrite for QSPI protocol; incompatible voltage domain and memory map. | Consider only for new designs needing higher density and faster quad reads - not a drop-in replacement. |
Compared with 25LC320AT-I/SN, the 25LC320A-H/SN16KVAO delivers guaranteed operation at +150°C and automotive qualification, while AT25DF321A-SHN-T offers greater capacity and speed but demands full interface redesign and voltage translation.
Availability
25LC320A-H/SN16KVAO is available at Aetrix Electronics and suitable for automotive powertrain control, ADAS camera calibration, and battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 25LC320A-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25LCxxx family was designed specifically for robust, low-power serial EEPROM storage in automotive, industrial, and medical systems requiring AEC-Q100 qualification, high endurance, and extended temperature operation.
FAQ
What is the maximum clock frequency supported by the 25LC320A-H/SN16KVAO?
The 25LC320A-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 limits are defined in Table 1-2 of DS20002131D and apply across the full −40°C to +150°C operating range. Exceeding these frequencies may cause read/write failures or timing violations.
Does the 25LC320A-H/SN16KVAO support hardware write protection?
Yes, the 25LC320A-H/SN16KVAO supports hardware write protection via the WP pin (Pin 3) in conjunction with the WPEN bit in its STATUS register. When WPEN=1 and WP=low, writes to nonvolatile STATUS bits are disabled. This feature is explicitly documented in Section 2.3 and Table 5-1 of DS20002131D.
What is the page size of the 25LC320A-H/SN16KVAO, and why does it matter?
The 25LC320A-H/SN16KVAO has a 32-byte page size, as confirmed in the Device Selection Table on page 2 of DS20002131D. This matters because page writes must remain within a single physical page boundary - crossing boundaries causes data to wrap within the same page, potentially overwriting valid content. Software must enforce address alignment.
Is the 25LC320A-H/SN16KVAO qualified for automotive applications?
Yes, the 25LC320A-H/SN16KVAO is AEC-Q100 qualified (Grade 0) for operation from −40°C to +150°C, as stated in the Features section (page 1) and Electrical Characteristics notes (page 3) of DS20002131D. This qualification covers reliability testing including 1,000 hours at +150°C ambient.
How does the HOLD pin function in the 25LC320A-H/SN16KVAO?
The HOLD pin (Pin 7) suspends ongoing SPI communication without resetting the internal address pointer or instruction state. It must be asserted while SCK is low; SO goes high-Z immediately. Resuming requires bringing HOLD high while SCK remains low. This behavior is detailed in Section 2.6 and Figure 1-1 of DS20002131D.
25LC320A-H/SN16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
25LC320A-H/SN16KVAO FAQ
1.How can I place an order for 25LC320A-H/SN16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC320A-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 25LC320A-H/SN16KVAO reliable?
The price and inventory of 25LC320A-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 25LC320A-H/SN16KVAO is usually 5 days.
3.What payment methods are accepted for 25LC320A-H/SN16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC320A-H/SN16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC320A-H/SN16KVAO?
25LC320A-H/SN16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC320A-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 25LC320A-H/SN16KVAO?
For technical support, including 25LC320A-H/SN16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC320A-H/SN16KVAO requirements.
6.How does Aetrix verify that 25LC320A-H/SN16KVAO is sourced from the original manufacturer or authorized distributors?
All 25LC320A-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 25LC320A-H/SN16KVAO meets industry standards.
7.What is the process for return or replacement of 25LC320A-H/SN16KVAO?
All 25LC320A-H/SN16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25LC320A-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 25LC320A-H/SN16KVAO part is unused and in its original packaging.
Return procedure for 25LC320A-H/SN16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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