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Microchip Technology 25AA160AT-I/ST
- Part No.:
- 25AA160AT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
25AA160AT-I/ST.pdf
- Description:
- IC EEPROM 16KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,892
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Product details
Overview
25AA160AT-I/ST from Microchip Technology Inc. is a 16 Kbit (2048 × 8) SPI Serial EEPROM with 1.8–5.5 V supply range, 16-byte page size, and Industrial temperature grade (–40°C to +85°C). It features hardware write protection via WP pin, HOLD functionality for interrupt-safe bus suspension, and self-timed 5 ms max write cycles. Used for firmware parameter storage in industrial controllers requiring low-voltage operation and robust data retention.
For engineers reviewing the 25AA160AT-I/ST datasheet, 25AA160AT-I/ST pinout, 25AA160AT-I/ST application, or 25AA160AT-I/ST equivalent, key selection criteria include VCC min (1.8 V), page size (16 bytes), HOLD/SO/SI timing compatibility with host SPI controller, and WPEN-controlled hardware write protection behavior.
Technical Context
The 25AA160AT-I/ST implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, requiring CS assertion, SCK synchronization, and optional HOLD suspension. Its internal architecture includes an 8-bit instruction register, page latches, and HV generator for EEPROM programming.
Write operations require explicit WREN instruction before WRITE, followed by CS high to trigger internal 5 ms erase/write cycle; STATUS register (RDSR/WRSR) provides real-time WIP, WEL, BP0/BP1, and WPEN status. Block protection supports none/1/4/1/2/all array segments via nonvolatile BP bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit (2048 × 8-bit organization), sufficient for boot configuration, calibration data, or device ID storage in space-constrained designs |
| Supply Voltage | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting |
| Page Size | 16 bytes - constrains burst writes to single-page boundaries; crossing page boundary wraps data within same page |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V - supports high-speed read/write in systems with fast SPI peripherals |
| Write Cycle Time | 5 ms maximum - defines minimum interval between successive write commands; impacts firmware update latency |
| Data Retention | Greater than 200 years - ensures long-term reliability of stored parameters in unpowered industrial equipment |
| Endurance | 1,000,000 erase/write cycles - supports frequent logging or dynamic configuration updates over product lifetime |
Pinout & Package
25AA160AT-I/ST is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, optimized for compact PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable; must be held low during full SPI transaction; rising edge initiates internal write cycle after valid WRITE sequence |
| SO (Pin 2) | Serial Data Output | Tri-state output; data shifted out on falling edge of SCK; enters high-impedance state when CS is high or HOLD is asserted |
| WP (Pin 3) | Write-Protect Pin | Hardware lock for STATUS register when WPEN = 1; low = blocks WRSR; high = enables full STATUS register access |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic; requires low-impedance connection to system ground plane |
| SI (Pin 5) | Serial Data Input | Accepts instructions, addresses, and data on rising edge of SCK; sampled only when CS is low and HOLD is high |
| SCK (Pin 6) | Serial Clock Input | Master-generated clock; rising edge latches SI, falling edge updates SO; HOLD must be low while SCK is low to activate pause |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI transfer without resetting state; SO/SI/SCK tri-stated; resume requires HOLD high while SCK is low |
| VCC (Pin 8) | Supply Voltage | Core power input; decoupling capacitor (0.1 µF) required near pin to suppress switching noise during write cycles |
Key Features
| Feature | Design Value |
|---|---|
| 16-byte page write capability | Enables efficient burst writes up to 16 bytes per command, reducing SPI overhead versus byte-by-byte writes |
| Hardware write protection with WPEN control | Allows permanent locking of STATUS register via WP pin only when WPEN bit is set, preventing accidental protection misconfiguration |
| HOLD pin for interrupt-safe bus suspension | Permits host MCU to service higher-priority interrupts mid-transaction without losing SPI state or requiring reinitialization |
| Power-on write disable and automatic WEL reset | Guarantees no spurious writes at power-up; eliminates need for external POR circuitry to manage write-enable state |
| Industrial temperature range (–40°C to +85°C) | Validates reliable operation in factory automation, motor drives, and outdoor embedded systems without derating |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Nonvolatile parameter memory accessed via SPI during boot and runtime; HOLD used during motion-control interrupt servicing. Use Value: 1.8 V operation allows direct interface with low-power ARM Cortex-M3/M4 MCUs; 200-year data retention ensures settings survive decades of equipment reuse. |
Use Scenario: Holding sensor offset/gain coefficients and regulatory compliance logs in portable diagnostic instruments subject to sterilization cycles. IC Role / Device Role / Timing Role: SPI EEPROM providing tamper-resistant calibration storage; WP pin permanently locked post-calibration to prevent field modification. Use Value: 1,000,000 endurance cycles support daily recalibration routines; 16-byte page writes accelerate coefficient batch updates during production test. |
| Smart Energy Meter Firmware Flags | Automotive Body Control Module Settings |
Use Scenario: Recording tariff schedules, demand-response event flags, and meter firmware version in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Low-voltage (1.8 V) serial memory storing infrequently updated but mission-critical operational flags; accessed during meter wake-up from deep sleep. Use Value: 5 µA standby current minimizes battery drain in backup-powered meters; block protection prevents corruption of billing-critical registers. |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door-lock configurations in automotive BCMs operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to 3.3 V CAN microcontroller; HOLD suspends EEPROM access during CAN frame transmission interrupts. Use Value: –40°C to +85°C rating matches under-hood BCM thermal envelope; hardware WP prevents unauthorized reprogramming of safety-related settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA160AT-I/MC | Same 16 Kbit, 1.8–5.5 V, 16-byte page, Industrial temp; differs only in 8-lead MSOP package (3.0 × 3.0 mm vs. TSSOP 3.0 × 4.4 mm) | MSOP offers smaller footprint but lower thermal mass; less suitable for high-reliability vibration environments than TSSOP | Select 25AA160AT-I/MC only if board space is constrained and thermal cycling is minimal. |
| AT25DF021-SSH-T | 2 Mbit density, 2.7–3.6 V only, 256-byte pages, supports dual/quad SPI; lacks HOLD and WP pins; different instruction set | Designed for firmware code storage, not parameter EEPROM; incompatible timing and protection model | Choose AT25DF021-SSH-T only for high-density code shadowing; not a functional substitute for 25AA160AT-I/ST's parameter storage role. |
Compared with 25AA160AT-I/MC, the 25AA160AT-I/ST offers identical electrical and functional behavior but in a mechanically more robust TSSOP package better suited for industrial vibration; versus AT25DF021-SSH-T, it provides dedicated parameter EEPROM features-HOLD, hardware WP, and 16-byte page granularity-essential for reliable configuration storage.
Availability
25AA160AT-I/ST is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration data retention, and smart energy meter firmware flag management requiring stable component supply across multi-year production cycles.
Supply support for 25AA160AT-I/ST 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 company specializing in microcontrollers, analog devices, and memory products, with a focus on embedded control and connectivity solutions.
The 25AA160A/B family is designed specifically for low-voltage, high-reliability serial parameter storage in industrial, medical, and consumer electronics where SPI interface simplicity and long-term data integrity are critical.
FAQ
What is the minimum supply voltage required for reliable operation of the 25AA160AT-I/ST?
The 25AA160AT-I/ST operates reliably down to 1.8 V across its full Industrial temperature range (–40°C to +85°C). At VCC = 1.8 V, maximum clock frequency is 3 MHz, and DC characteristics such as VOL and VIH2 are specified accordingly. This enables direct integration with 1.8 V logic families without level translation.
How does the HOLD pin function during an active SPI transaction with the 25AA160AT-I/ST?
When the HOLD pin is pulled low while SCK is low, the 25AA160AT-I/ST immediately suspends SPI communication: SO, SI, and SCK enter high-impedance states, and internal state is preserved. To resume, HOLD must be returned high while SCK remains low; the transaction continues from the exact bit position where it paused, eliminating retransmission overhead.
Can the 25AA160AT-I/ST be used in systems requiring hardware write protection of the STATUS register?
Yes - the 25AA160AT-I/ST supports hardware write protection of the STATUS register via the WP pin when the WPEN bit (bit 7 of STATUS register) is set to '1'. With WP low and WPEN = 1, writes to nonvolatile STATUS bits (BP0, BP1, WPEN) are blocked, while memory array reads/writes remain fully functional.
What happens if a page write command crosses a 16-byte boundary on the 25AA160AT-I/ST?
If a page write command attempts to cross a 16-byte boundary, data wraps around to the start of the current page instead of advancing to the next page. For example, writing 16 bytes starting at address 0x000F fills addresses 0x000F–0x001E, then overwrites 0x0000–0x000D. Application firmware must enforce page alignment to avoid unintended data loss.
Is the 25AA160AT-I/ST RoHS compliant and Pb-free?
Yes - the 25AA160AT-I/ST is Pb-free and RoHS compliant, as confirmed in the DS21807D datasheet. The TSSOP package uses matte tin (Sn) plating per JEDEC standards, and packaging markings include the Pb-free JEDEC designator (3e) on outer packaging.
25AA160AT-I/ST 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:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 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-TSSOP
25AA160AT-I/ST FAQ
1.How can I place an order for 25AA160AT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA160AT-I/ST 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 25AA160AT-I/ST reliable?
The price and inventory of 25AA160AT-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA160AT-I/ST is usually 5 days.
3.What payment methods are accepted for 25AA160AT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA160AT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA160AT-I/ST?
25AA160AT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA160AT-I/ST 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 25AA160AT-I/ST?
For technical support, including 25AA160AT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA160AT-I/ST requirements.
6.How does Aetrix verify that 25AA160AT-I/ST is sourced from the original manufacturer or authorized distributors?
All 25AA160AT-I/ST 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 25AA160AT-I/ST meets industry standards.
7.What is the process for return or replacement of 25AA160AT-I/ST?
All 25AA160AT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 25AA160AT-I/ST, 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 25AA160AT-I/ST part is unused and in its original packaging.
Return procedure for 25AA160AT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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