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Microchip Technology 25AA160CT-I/ST

Name: 25AA160CT-I/ST
Brand: Microchip Technology
SKU: 25AA160CT-I/ST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 25AA160CT-I/ST

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: 25AA160CT-I/ST.pdf

Description:: IC EEPROM 16KBIT SPI 8TSSOP

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Product details

Overview

25AA160CT-I/ST from Microchip Technology is a 16 Kbit (2048 × 8) SPI Serial EEPROM with 1.8–5.5 V supply range, 16-byte page write capability, and industrial temperature rating (−40°C to +85°C). It features hardware write protection via WP pin, HOLD functionality for bus arbitration, and supports up to 10 MHz clock at 4.5–5.5 V. Used in embedded systems for parameter storage, calibration data retention, and firmware configuration in microcontroller-based designs.

For engineers reviewing the 25AA160CT-I/ST datasheet, 25AA160CT-I/ST pinout, 25AA160CT-I/ST application, or 25AA160CT-I/ST equivalent, this page delivers verified electrical specs, SPI timing constraints, page-write boundary behavior, block protection mapping, and real-world use context - all confirmed against DS22150B and Microchip's official package documentation for the ST (TSSOP-8) variant.

Technical Context

The 25AA160CT-I/ST implements a standard SPI Mode 0,0 (CPOL=0, CPHA=0) interface with separate SI/SO lines and active-low CS. Its internal architecture includes an 8-bit instruction register, page latches, HV generator for EEPROM programming, and a STATUS register with WIP, WEL, BP0/BP1, and WPEN bits.

Write operations require explicit WREN before WRITE or WRSR commands; CS high after final data bit initiates self-timed 5 ms max internal write cycle. Block protection divides the 2048-byte array into four 512-byte segments, configurable via BP0/BP1 to protect none, upper 1/4 (0600h–07FFh), upper 1/2 (0400h–07FFh), or full array (0000h–07FFh).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	16 Kbit (2048 × 8 bits); sufficient for storing device IDs, calibration coefficients, or small firmware patches in space-constrained MCU systems.
Page Size	16 bytes; limits contiguous writes to within physical page boundaries - software must detect and split cross-page writes to avoid data wraparound.
Max Clock Frequency	10 MHz at VCC ≥ 4.5 V; enables fast read/write throughput (up to ~1.25 MB/s theoretical SPI bandwidth) without requiring external clock dividers.
Write Endurance	>1 million erase/write cycles; supports frequent field-updatable parameters (e.g., energy meter logs, sensor calibration history) over product lifetime.
Data Retention	>200 years at +25°C; ensures long-term integrity of stored configuration data without battery backup or refresh logic.
VCC Range	1.8 V to 5.5 V; interoperable with both 1.8 V logic families and legacy 5 V microcontrollers, simplifying mixed-voltage board design.
Standby Current	5 µA at 5.5 V and +125°C; critical for always-on IoT nodes and battery-powered devices where quiescent power dominates system budget.

Pinout & Package

25AA160CT-I/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, RoHS-compliant matte tin finish, and JEDEC MO-153AC footprint. Package dimensions: 3.0 mm × 4.4 mm × 1.1 mm (max height).

Pin/Terminal	Circuit Role	Design Meaning
1 - CS	Chip Select Input	Active-low enable; must be low for SPI communication; rising edge after valid write sequence triggers internal 5 ms write cycle.
2 - SO	Serial Data Output	Tri-state open-drain output; data shifts out on falling SCK edge; high-impedance when CS high or HOLD low.
3 - WP	Write-Protect Pin	Hardware lock for STATUS register nonvolatile bits; effective only when WPEN = 1 in STATUS register; grounded to enforce protection.
4 - VSS	Ground Reference	Primary return path for all internal circuitry; must be low-impedance connection to minimize noise coupling into EEPROM array.
5 - SI	Serial Data Input	CMOS input; latches instruction/address/data on rising SCK edge; requires clean signal integrity to prevent spurious command execution.
6 - SCK	Serial Clock Input	Synchronous timing reference; max 10 MHz at 4.5–5.5 V; rise/fall times ≤2 µs required to meet setup/hold timing margins.
7 - HOLD	Bus Hold Control	Pauses ongoing SPI transfer without resetting state; must be asserted while SCK is low; tri-states SO during hold to allow bus sharing.
8 - VCC	Supply Voltage	Power rail for core logic and EEPROM programming; bypass capacitor (0.1 µF ceramic) required within 5 mm of pin for stable write operation.

Key Features

Feature	Design Value
Self-timed write cycle	Internal 5 ms max erase/write eliminates need for external timeout logic or polling delay loops in host firmware.
Block write protection	Configurable via BP0/BP1 bits to protect 0%, 25%, 50%, or 100% of memory - enables secure boot code partitioning and user-configurable region locking.
HOLD pin support	Enables deterministic bus arbitration: host can service higher-priority interrupts mid-transfer and resume exactly where paused, preserving address pointer state.
Power-on write disable	WEL latch resets at power-up, preventing accidental writes during brown-out or reset sequences - no external POR circuit needed.
ESD robustness	4 kV HBM rating on all pins ensures reliability in manufacturing handling and end-equipment environments with static-prone interfaces.

Applications

Industrial Sensor Node	Medical Device Calibration
Use Scenario: A wireless temperature sensor node stores factory calibration offsets, last-reported values, and OTA update metadata across power cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter store interfaced via SPI to an ARM Cortex-M0+ MCU; accessed during boot and periodic measurement cycles. Use Value: 2048-byte capacity holds 128×16-bit calibration points plus metadata; 1.8 V operation extends battery life; 5 µA standby current minimizes self-discharge.	Use Scenario: An infusion pump retains per-cartridge dose history, operator audit logs, and safety-critical alarm thresholds between clinical sessions. IC Role / Device Role / Timing Role: Secure configuration vault with hardware write-protection enabled for critical registers; accessed only by trusted firmware during initialization. Use Value: WP pin + WPEN bit prevents runtime corruption of alarm thresholds; >200-year data retention meets FDA 510(k) archival requirements; −40°C to +85°C rating covers sterilization and operating ranges.
Smart Energy Meter	Automotive Body Control Module
Use Scenario: A DIN-rail mounted electricity meter logs tariff schedules, tamper events, and cumulative kWh counters over 20+ year deployments. IC Role / Device Role / Timing Role: High-reliability data logger with sequential read/write access; isolated SPI interface driven by metering SoC. Use Value: >1M endurance supports daily logging; 16-byte page writes optimize flash wear leveling; RoHS-compliant TSSOP-8 fits compact PCB layouts.	Use Scenario: A BCM stores seat position presets, mirror angles, and lighting profiles for driver personalization across ignition cycles. IC Role / Device Role / Timing Role: User preference storage with fast random-access reads and infrequent writes; co-located with CAN transceiver and MCU. Use Value: 10 MHz SPI speed enables sub-millisecond profile load; HOLD pin allows seamless CAN interrupt servicing; 5.5 V tolerance matches automotive 12 V supply rails with LDO regulation.

Industrial Sensor Node

Medical Device Calibration

Use Scenario: A wireless temperature sensor node stores factory calibration offsets, last-reported values, and OTA update metadata across power cycles.

IC Role / Device Role / Timing Role: Nonvolatile parameter store interfaced via SPI to an ARM Cortex-M0+ MCU; accessed during boot and periodic measurement cycles.

Use Value: 2048-byte capacity holds 128×16-bit calibration points plus metadata; 1.8 V operation extends battery life; 5 µA standby current minimizes self-discharge.

Use Scenario: An infusion pump retains per-cartridge dose history, operator audit logs, and safety-critical alarm thresholds between clinical sessions.

IC Role / Device Role / Timing Role: Secure configuration vault with hardware write-protection enabled for critical registers; accessed only by trusted firmware during initialization.

Use Value: WP pin + WPEN bit prevents runtime corruption of alarm thresholds; >200-year data retention meets FDA 510(k) archival requirements; −40°C to +85°C rating covers sterilization and operating ranges.

Smart Energy Meter

Automotive Body Control Module

Use Scenario: A DIN-rail mounted electricity meter logs tariff schedules, tamper events, and cumulative kWh counters over 20+ year deployments.

IC Role / Device Role / Timing Role: High-reliability data logger with sequential read/write access; isolated SPI interface driven by metering SoC.

Use Value: >1M endurance supports daily logging; 16-byte page writes optimize flash wear leveling; RoHS-compliant TSSOP-8 fits compact PCB layouts.

Use Scenario: A BCM stores seat position presets, mirror angles, and lighting profiles for driver personalization across ignition cycles.

IC Role / Device Role / Timing Role: User preference storage with fast random-access reads and infrequent writes; co-located with CAN transceiver and MCU.

Use Value: 10 MHz SPI speed enables sub-millisecond profile load; HOLD pin allows seamless CAN interrupt servicing; 5.5 V tolerance matches automotive 12 V supply rails with LDO regulation.

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/ST	Same 16 Kbit, 16-byte page, TSSOP-8 package, but rated for extended industrial temp (−40°C to +125°C) and 1.8–5.5 V VCC.	Required for under-hood automotive modules or high-ambient industrial enclosures exceeding +85°C.	Select 25AA160AT-I/ST if ambient operating temperature exceeds +85°C; otherwise 25AA160CT-I/ST provides identical functionality at lower cost.
25LC160CT-I/ST	Same 16 Kbit, 16-byte page, TSSOP-8 package, but minimum VCC = 2.5 V (vs. 1.8 V for 25AA160CT-I/ST); otherwise identical timing and feature set.	Not suitable for 1.8 V logic domains; acceptable in 3.3 V or 5 V systems where supply headroom permits.	Choose 25LC160CT-I/ST only if system VCC is guaranteed ≥2.5 V and 1.8 V compatibility is unnecessary; 25AA160CT-I/ST offers broader voltage flexibility.

Compared with 25AA160AT-I/ST and 25LC160CT-I/ST, the 25AA160CT-I/ST uniquely balances 1.8 V operation, industrial temperature range, and cost - making it optimal for battery-powered, space-constrained, and mixed-voltage embedded systems where extended temperature is not required.

Availability

25AA160CT-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, smart energy meters, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for 25AA160CT-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 leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA160C/D family was designed specifically for reliable, low-power, SPI-compatible nonvolatile storage in resource-constrained embedded systems - emphasizing voltage flexibility, write endurance, and robust bus arbitration features like HOLD and hardware write protection.

FAQ

What is the maximum clock frequency supported by the 25AA160CT-I/ST?

The 25AA160CT-I/ST supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V, 5 MHz at 2.5–4.5 V, and 3 MHz at 1.8–2.5 V. These graded limits ensure timing margin compliance across its full 1.8–5.5 V operating range, as specified in Table 1-2 of DS22150B. The 25AA160CT-I/ST does not support overclocking beyond these values.

Does the 25AA160CT-I/ST support page write operations, and what is the page size?

Yes, the 25AA160CT-I/ST supports page write operations with a fixed 16-byte page size, as confirmed in the Device Selection Table and Section 2.3 of DS22150B. Writes crossing a 16-byte boundary wrap to the start of the same page - software must validate address alignment before initiating multi-byte writes. This behavior is intrinsic to the 25AA160CT-I/ST 'C' version architecture.

How does hardware write protection work on the 25AA160CT-I/ST?

Hardware write protection on the 25AA160CT-I/ST requires both the WP pin to be low *and* the WPEN bit (bit 7 of STATUS register) to be set to 1. When both conditions are met, writes to nonvolatile STATUS bits are blocked - but memory array writes remain permitted unless BP0/BP1 bits are also set. This dual-condition mechanism is explicitly defined in Table 2-4 and Section 2.6 of DS22150B for the 25AA160CT-I/ST.

What is the endurance and data retention specification for the 25AA160CT-I/ST?

The 25AA160CT-I/ST guarantees >1 million erase/write cycles and >200 years of data retention at +25°C, as stated in Table 1-3 (Param. No. 21) and Section 1.0 of DS22150B. These values are characterized across the full industrial temperature range and apply directly to the 25AA160CT-I/ST part number - not extrapolated from other variants.

Is the 25AA160CT-I/ST compatible with standard SPI Mode 0,0?

Yes, the 25AA160CT-I/ST operates in SPI Mode 0,0 (CPOL = 0, CPHA = 0): data is sampled on the rising edge of SCK and output on the falling edge, with CS active low. This is confirmed in Section 2.1 and Figure 1-2 of DS22150B, and applies identically to the 25AA160CT-I/ST TSSOP-8 variant.

25AA160CT-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

25AA160CT-I/ST FAQ

1.How can I place an order for 25AA160CT-I/ST through Aetrix?

Please submit a Request for Quotation (RFQ) for 25AA160CT-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 25AA160CT-I/ST reliable?

The price and inventory of 25AA160CT-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 25AA160CT-I/ST is usually 5 days.

3.What payment methods are accepted for 25AA160CT-I/ST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA160CT-I/ST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 25AA160CT-I/ST?

25AA160CT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 25AA160CT-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 25AA160CT-I/ST?

For technical support, including 25AA160CT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA160CT-I/ST requirements.

6.How does Aetrix verify that 25AA160CT-I/ST is sourced from the original manufacturer or authorized distributors?

All 25AA160CT-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 25AA160CT-I/ST meets industry standards.

7.What is the process for return or replacement of 25AA160CT-I/ST?

All 25AA160CT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 25AA160CT-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 25AA160CT-I/ST part is unused and in its original packaging.

Return procedure for 25AA160CT-I/ST:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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