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Microchip Technology 25LC320A-H/SN
- Part No.:
- 25LC320A-H/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC320A-H/SN.pdf
- Description:
- IC EEPROM 32KBIT SPI 5MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,716
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Product details
Overview
25LC320A-H/SN 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 at 4.5–5.5V. It features byte- and page-write (32-byte pages), hardware write protection via WP pin and STATUS register, and AEC-Q100 qualification for automotive high-temp operation (−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/SN datasheet, 25LC320A-H/SN pinout, 25LC320A-H/SN application, or 25LC320A-H/SN equivalent, key selection criteria include its extended temperature range, 32-byte page size, HOLD functionality for interrupt-safe SPI pauses, and block-level write protection (none/¼/½/all array).
Technical Context
The 25LC320A-H/SN implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data-in) and SO (data-out) lines, requiring CS, SCK, and optional HOLD/WP control. Its internal architecture includes an 8-bit instruction register, page latches, and HV generator for EEPROM programming.
It supports self-timed internal write cycles (≤6 ms), automatic address incrementing during sequential reads, and real-time STATUS register access-including WIP (Write-In-Process), WEL (Write Enable Latch), BP0/BP1 (block protection), and WPEN bits-enabling robust firmware-managed data integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density | 32 Kbit (4,096 × 8-bit organization) - defines maximum configurable parameter storage capacity |
| Supply Voltage | 2.5V–5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level-shifting |
| Max Clock Speed | 5 MHz at VCC ≥ 4.5V - supports high-throughput firmware updates and logging in real-time systems |
| Page Size | 32 bytes - constrains burst writes to aligned boundaries; crossing pages wraps data within same physical page |
| Write Cycle Time | ≤6 ms - determines minimum interval between write commands; impacts system responsiveness during config saves |
| Endurance | >1,000,000 erase/write cycles - ensures reliability over 10+ years of frequent recalibration or event logging |
| Data Retention | >200 years at +150°C - guarantees long-term validity of calibration coefficients and safety-critical settings |
Pinout & Package
8-Lead SOIC (SN package), 3.90 mm body width, RoHS-compliant, with gull-wing leads and JEDEC-standard footprint (pitch = 1.27 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable: must be low for all SPI transactions; rising edge initiates internal write cycle after valid write sequence |
| SO (Pin 2) | Serial Data Output | Tri-state open-drain output; data shifted out on SCK falling edge; high-impedance when CS high or HOLD low |
| WP (Pin 3) | Write-Protect Pin | Hardware lock: disables STATUS register writes when WP = low and WPEN = 1; no effect on memory writes unless BP bits set |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic; must be low-impedance connection to avoid noise-induced read errors |
| SI (Pin 5) | Serial Data Input | CMOS input latching data on SCK rising edge; accepts instructions, addresses, and payload bytes in MSb-first order |
| SCK (Pin 6) | Serial Clock Input | Master-generated clock; timing-critical for setup/hold compliance; max 5 MHz at VCC ≥ 4.5V |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI transfer without resetting state; requires SCK low before assertion; tri-states SO during hold |
| VCC (Pin 8) | Supply Voltage | Power rail for core logic and EEPROM array; decoupling capacitor (0.1 µF) required near pin for stable write operations |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Range | H-grade (−40°C to +150°C) - validated for under-hood automotive applications and industrial motor drives |
| Hardware Write Protection | WP pin + WPEN bit + BP0/BP1 bits - enables selective locking of top ¼/½/all memory blocks against accidental overwrite |
| HOLD Functionality | Interrupt-safe SPI pause - allows host MCU to service higher-priority tasks mid-transaction without reinitializing communication |
| Self-Timed Write Cycles | No external timing control needed - internal circuitry manages erase/write timing; STATUS register reports WIP status |
| AEC-Q100 Qualification | Qualified per Rev G stress tests - meets automotive reliability requirements for safety-critical subsystems |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Battery Management System (BMS) |
|---|---|
|
Use Scenario: Storing calibrated fuel injection maps and fault log history across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed retention >200 years at 150°C ambient. Use Value: Eliminates need for external backup capacitors or supercapacitors while maintaining ASIL-B data integrity. |
Use Scenario: Recording cell voltage calibration offsets and thermal derating tables during factory commissioning. IC Role / Device Role / Timing Role: SPI-configurable parameter vault with hardware write-lock for production-critical values. Use Value: Prevents field firmware from overwriting factory-set safety thresholds via WP pin grounding. |
| Medical Infusion Pump Controller | Railway Signaling Interface Module |
|
Use Scenario: Holding drug library metadata and dose limit presets subject to regulatory audit trails. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with block-level protection (BP1/BP0) for certified parameters. Use Value: Enables IEC 62304-compliant traceability by locking critical safety parameters against runtime modification. |
Use Scenario: Storing track-side signal timing profiles and fail-safe fallback states in EN 5012x-certified hardware. IC Role / Device Role / Timing Role: High-reliability nonvolatile memory with >1M endurance for cyclic diagnostic logging. Use Value: Supports SIL-3 functional safety requirements through verified write-cycle longevity and ESD immunity (>4 kV). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF321A-MAU-T | 32-Mbit density, quad SPI interface, 85 MHz max clock, 2.7–3.6V only | Higher throughput but narrower voltage range; lacks HOLD and WP pins | Select for high-speed boot code storage where voltage is fixed at 3.3V and interrupt pausing is unnecessary |
| BR24G32FJ-3GE2 | 32-Kbit, I²C interface, 1.7–5.5V, 1 MHz max, built-in address auto-increment | No SPI compatibility; simpler two-wire bus but slower and no HOLD/WP hardware control | Select for space-constrained designs using I²C master peripherals and requiring minimal pin count |
Compared with AT25DF321A-MAU-T and BR24G32FJ-3GE2, the 25LC320A-H/SN uniquely balances automotive-grade temperature resilience, SPI protocol fidelity with HOLD/WP pins, and broad 2.5–5.5V operation-making it optimal for legacy MCU-based systems needing deterministic, interrupt-tolerant nonvolatile storage.
Availability
25LC320A-H/SN is available at Aetrix Electronics and suitable for automotive engine control units, industrial battery management systems, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 25LC320A-H/SN 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products, with global design and manufacturing infrastructure.
The 25LCxxx family was designed specifically for high-reliability, SPI-compatible nonvolatile storage in automotive, industrial, and medical systems demanding extended temperature operation and AEC-Q100 compliance.
FAQ
What is the maximum clock frequency supported by the 25LC320A-H/SN?
The 25LC320A-H/SN supports up to 5 MHz clock frequency when VCC is between 4.5V and 5.5V. At lower supply voltages (2.5V ≤ VCC < 4.5V), the maximum clock speed reduces to 3 MHz. These limits are defined in Table 1-2 of the DS20002131D datasheet and directly impact achievable SPI throughput in real-time applications. The 25LC320A-H/SN must meet AC timing parameters including TCSS, TCSH, and Tsu to ensure reliable communication at these speeds.
Does the 25LC320A-H/SN support hardware write protection?
Yes, the 25LC320A-H/SN supports dual-layer hardware write protection: the WP pin (Pin 3) combined with the WPEN bit in the STATUS register enables selective disabling of STATUS register writes, while BP0/BP1 bits allow software-defined protection of none, upper 1/4, upper 1/2, or the entire memory array. This configuration is retained across power cycles and is validated per AEC-Q100 requirements. The 25LC320A-H/SN's protection matrix is detailed in Table 5-1 of the datasheet.
What is the page size and write endurance of the 25LC320A-H/SN?
The 25LC320A-H/SN has a page size of 32 bytes, meaning up to 32 consecutive bytes can be written in a single page-write command-provided they reside within the same physical page boundary. Its endurance exceeds 1,000,000 erase/write cycles at 25°C and 5.5V, with data retention exceeding 200 years at +150°C. These specifications are confirmed in Tables 1-1 and 1-2 of the DS20002131D datasheet and apply specifically to the 25LC320A-H/SN variant.
How does the HOLD pin function on the 25LC320A-H/SN?
The HOLD pin (Pin 7) on the 25LC320A-H/SN suspends ongoing SPI communication without resetting the internal state-allowing the host MCU to service higher-priority interrupts and resume exactly where transmission left off. HOLD must be asserted while SCK is low; otherwise, suspension waits until the next SCK high-to-low transition. During HOLD, SI, SCK, and SO enter high-impedance states. This behavior is fully documented in Section 2.6 and Figure 1-1 of the 25LC320A-H/SN datasheet.
Is the 25LC320A-H/SN qualified for automotive applications?
Yes, the 25LC320A-H/SN is AEC-Q100 qualified (Grade H) for automotive use, with full validation across −40°C to +150°C ambient temperature. It meets stress testing requirements per Rev G, including HTOL, TC, and ESD (>4 kV HBM). The "H" suffix explicitly denotes this extended temperature and qualification grade, and the "/SN" suffix confirms the 8-lead SOIC package. This makes the 25LC320A-H/SN suitable for under-hood and transmission-control applications where reliability under thermal cycling is mandatory.
25LC320A-H/SN 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:
- 5 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25LC320A-H/SN FAQ
1.How can I place an order for 25LC320A-H/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC320A-H/SN 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/SN reliable?
The price and inventory of 25LC320A-H/SN 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/SN is usually 5 days.
3.What payment methods are accepted for 25LC320A-H/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC320A-H/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC320A-H/SN?
25LC320A-H/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC320A-H/SN 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/SN?
For technical support, including 25LC320A-H/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC320A-H/SN requirements.
6.How does Aetrix verify that 25LC320A-H/SN is sourced from the original manufacturer or authorized distributors?
All 25LC320A-H/SN 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/SN meets industry standards.
7.What is the process for return or replacement of 25LC320A-H/SN?
All 25LC320A-H/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25LC320A-H/SN, 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/SN part is unused and in its original packaging.
Return procedure for 25LC320A-H/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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