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Microchip Technology 25LC320AT-E/ST16KVAO
- Part No.:
- 25LC320AT-E/ST16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
25LC320AT-E/ST16KVAO.pdf
- Description:
- IC EEPROM 32KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,695
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Product details
Overview
25LC320AT-E/ST16KVAO from Microchip Technology Inc. is a 32-Kbit SPI Serial EEPROM with 4096 × 8-bit organization, 32-byte page write capability, and AEC-Q100 qualified operation across –40°C to +125°C. It supports up to 10 MHz clock frequency at 4.5–5.5 V, features hardware write protection via WP pin and STATUS register, and delivers >1 million erase/write cycles with >200-year data retention for automotive and industrial control memory logging.
For engineers reviewing the 25LC320AT-E/ST16KVAO datasheet, 25LC320AT-E/ST16KVAO pinout, 25LC320AT-E/ST16KVAO application, or 25LC320AT-E/ST16KVAO equivalent, key selection criteria include extended temperature support, block-level write protection (none/1/4/1/2/all), HOLD pin functionality for interrupt-safe SPI pausing, and TSSOP-8 packaging with RoHS-compliant matte tin finish.
Technical Context
The 25LC320AT-E/ST16KVAO implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, requiring CS low, SCK synchronized rising-edge sampling on SI and falling-edge output on SO. Its internal architecture includes an 8-bit instruction register, page latches, and HV generator for EEPROM programming.
Write operations require explicit WREN instruction followed by CS high to set the write enable latch; writes are self-timed (≤5 ms) and automatically reset the latch upon completion. The HOLD pin suspends ongoing SPI transfers without resetting the sequence, enabling host servicing of higher-priority interrupts while preserving address and state context.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit array), sufficient for firmware parameter storage or calibration data in space-constrained ECUs. |
| Interface | SPI-compatible serial bus (Mode 0,0), compatible with PIC® and most MCU SPI peripherals without bit-banging overhead. |
| Max Clock Frequency | 10 MHz at VCC = 4.5–5.5 V, enabling fast read/write bursts in real-time control loops. |
| Page Size | 32-byte page write buffer, limiting contiguous writes to one physical page boundary (0x000–0x01F, etc.) to prevent wraparound corruption. |
| Write Endurance | >1 million erase/write cycles at +25°C/5.5 V, supporting long-life logging in telematics or powertrain modules. |
| Data Retention | >200 years at +25°C, ensuring nonvolatile integrity over full vehicle lifecycle without refresh. |
| Temperature Range | Extended grade (–40°C to +125°C), validated per AEC-Q100 for under-hood and transmission control applications. |
Pinout & Package
25LC320AT-E/ST16KVAO is supplied in an 8-lead TSSOP package (3.0 mm × 4.4 mm body, 0.65 mm pitch), marked "25LC32AT" with "E" temperature grade and "16KVAO" traceability code. Pin 1 is located at top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low device enable; must go high after final data bit to initiate internal write cycle; forces SO into high-Z when deasserted. |
| SO (Pin 2) | Serial Data Output | Tri-state output shifting data MSB-first on SCK falling edge; enters high-Z immediately on HOLD low. |
| WP (Pin 3) | Write-Protect Input | Hardware lock for STATUS register nonvolatile bits when WPEN = 1; no effect on array writes unless BP0/BP1 configured. |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic; must be low-impedance to minimize noise coupling during write cycles. |
| SI (Pin 5) | Serial Data Input | Latches instruction/address/data on SCK rising edge; accepts 8-bit opcodes (e.g., 0x03 for READ, 0x02 for WRITE). |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transfers; max 10 MHz at 4.5–5.5 V; requires monotonic rise/fall times ≤2 µs. |
| HOLD (Pin 7) | Transfer Pause Control | Halts ongoing SPI sequence when pulled low during SCK low; resumes on next SCK high-to-low transition after HOLD high. |
| VCC (Pin 8) | Supply Voltage | 2.5–5.5 V operation; standby current ≤5 µA at +125°C ensures low quiescent draw in always-on modules. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Selectable via STATUS register BP0/BP1 bits to protect none, upper 1/4 (0xC00–0xFFF), upper 1/2 (0x800–0xFFF), or entire array (0x000–0xFFF). |
| Power-On Write Protection | Automatic WEL reset at power-up and after every successful write, preventing accidental overwrites during brown-out recovery. |
| HOLD Functionality | Enables deterministic SPI pause/resume without reinitializing CS or losing internal address pointer position-critical for interrupt-driven firmware. |
| ESD Robustness | 4 kV HBM rating on all pins ensures reliability in manufacturing handling and field deployment across harsh automotive environments. |
| RoHS & AEC-Q100 Compliance | Matte tin (Sn) lead finish and full AEC-Q100 Grade 1 qualification confirm suitability for production automotive electronics. |
Applications
| Engine Control Unit (ECU) Calibration Storage | Advanced Driver Assistance Systems (ADAS) Event Logging |
|---|---|
Use Scenario: Storing adaptive fuel trim tables and misfire counters that require frequent updates during vehicle operation. IC Role / Device Role / Timing Role: Nonvolatile parameter memory interfaced directly to ECU's SPI peripheral for sub-100 µs read access and 5 ms max write latency. Use Value: Enables field-upgradable calibration without external FRAM or battery-backed SRAM, reducing BOM cost and board area. | Use Scenario: Capturing timestamped sensor fusion data (camera, radar, IMU) during collision events for post-crash analysis. IC Role / Device Role / Timing Role: Fault-tolerant event logger triggered by safety controller; uses HOLD to suspend writes during CAN bus arbitration delays. Use Value: Guarantees data persistence through power loss during crash, meeting ISO 26262 ASIL-B diagnostic coverage requirements. |
| Electric Power Steering (EPS) Motor Profile Storage | Automotive Gateway Module Configuration |
Use Scenario: Holding torque compensation maps and motor phase alignment offsets updated during factory calibration and service procedures. IC Role / Device Role / Timing Role: Secure configuration memory with hardware WP pin tied low and WPEN=1, blocking unauthorized writes in production units. Use Value: Prevents tampering with safety-critical motor control parameters while allowing authorized service tools to reprogram via WRSR unlock sequence. | Use Scenario: Storing network routing tables, CAN FD message filters, and bootloader configuration flags across multiple vehicle variants. IC Role / Device Role / Timing Role: Shared SPI bus slave alongside transceivers and PMICs; uses CS-driven isolation and SO high-Z to avoid bus contention. Use Value: Supports flexible platform architecture with single PCB design across 12+ vehicle SKUs, reducing validation effort and inventory complexity. |
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/ST | Industrial temperature range (–40°C to +85°C); same pinout, timing, and instruction set. | Not qualified for under-hood or transmission control; suitable for cabin infotainment or body control modules. | Select when AEC-Q100 extended grade is not required and cost optimization is prioritized. |
| AT25DF321A-SH-B | 32-Mbit density, quad SPI interface, 85 MHz max clock; different command set and 8-lead SOIC package. | Higher throughput for firmware storage; lacks HOLD pin and AEC-Q100 qualification; not drop-in replaceable. | Choose only for new designs needing faster bulk reads or larger capacity-requires firmware and layout changes. |
Compared with 25LC320AT-I/ST, the 25LC320AT-E/ST16KVAO adds extended temperature validation and automotive qualification at minimal cost premium; versus AT25DF321A-SH-B, it offers proven interrupt-safe HOLD operation and guaranteed AEC-Q100 compliance for safety-critical logging, despite lower density and bandwidth.
Availability
25LC320AT-E/ST16KVAO is available at Aetrix Electronics and suitable for automotive engine control, ADAS event logging, electric power steering calibration, and gateway module configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 25LC320AT-E/ST16KVAO 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 solutions, with global design, manufacturing, and support infrastructure.
The 25LC320A family is designed for reliable, low-power nonvolatile data storage in automotive and industrial systems where extended temperature operation, hardware write protection, and SPI simplicity are essential.
FAQ
What is the maximum clock frequency supported by the 25LC320AT-E/ST16KVAO?
The 25LC320AT-E/ST16KVAO supports up to 10 MHz clock frequency when VCC is between 4.5 V and 5.5 V. At 2.5 V ≤ VCC < 4.5 V, the maximum clock drops to 5 MHz, and at 1.8 V ≤ VCC < 2.5 V, it is limited to 3 MHz. These limits ensure reliable setup/hold timing across voltage and temperature ranges, as verified in Table 1-2 of DS20001828H.
Does the 25LC320AT-E/ST16KVAO have built-in write protection beyond the WP pin?
Yes, the 25LC320AT-E/ST16KVAO includes dual-layer write protection: a hardware WP pin (active-low) and software-configurable Block Protection bits (BP0/BP1) in the STATUS register. When WPEN = 1 and WP = low, nonvolatile STATUS bits are locked; BP0/BP1 independently control write access to memory segments (none, 1/4, 1/2, or all). This is documented in Tables 3-3 and 3-4 of DS20001828H.
How does the HOLD function operate on the 25LC320AT-E/ST16KVAO during an active SPI transfer?
The HOLD pin on the 25LC320AT-E/ST16KVAO pauses ongoing SPI communication when pulled low while SCK is low. During hold, SI and SCK transitions are ignored, SO immediately tri-states, and the internal address pointer remains unchanged. Resuming requires HOLD high while SCK is low-then operation continues from the exact byte position. This behavior is defined in Section 2.6 and Figure 1-1 of DS20001828H.
What package type and markings identify the 25LC320AT-E/ST16KVAO?
The 25LC320AT-E/ST16KVAO uses an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch) with matte tin (Sn) finish. Top-side marking shows "25LC32AT" followed by "E" (extended temp), year-week code, and traceability "16KVAO". Pin 1 is at top-left with notch/dot; full package drawing is Microchip C04-057-TSSOP Rev F.
Is the 25LC320AT-E/ST16KVAO AEC-Q100 qualified, and what grade does it meet?
Yes, the 25LC320AT-E/ST16KVAO is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), as explicitly stated in the "Features" section of DS20001828H. This qualification covers stress testing for temperature cycling, humidity, ESD, and lifetime reliability-making it suitable for production automotive applications including engine, transmission, and ADAS control units.
25LC320AT-E/ST16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
25LC320AT-E/ST16KVAO FAQ
1.How can I place an order for 25LC320AT-E/ST16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC320AT-E/ST16KVAO 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-E/ST16KVAO reliable?
The price and inventory of 25LC320AT-E/ST16KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC320AT-E/ST16KVAO is usually 5 days.
3.What payment methods are accepted for 25LC320AT-E/ST16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC320AT-E/ST16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC320AT-E/ST16KVAO?
25LC320AT-E/ST16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC320AT-E/ST16KVAO 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-E/ST16KVAO?
For technical support, including 25LC320AT-E/ST16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC320AT-E/ST16KVAO requirements.
6.How does Aetrix verify that 25LC320AT-E/ST16KVAO is sourced from the original manufacturer or authorized distributors?
All 25LC320AT-E/ST16KVAO 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-E/ST16KVAO meets industry standards.
7.What is the process for return or replacement of 25LC320AT-E/ST16KVAO?
All 25LC320AT-E/ST16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25LC320AT-E/ST16KVAO, 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-E/ST16KVAO part is unused and in its original packaging.
Return procedure for 25LC320AT-E/ST16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25LC320AT-E/ST16KVAO Tags
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