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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT24C01C-MAPD-T

Name: AT24C01C-MAPD-T
Brand: Microchip Technology
SKU: AT24C01C-MAPD-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT24C01C-MAPD-T

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-UFDFN Exposed Pad

Datasheet:: AT24C01C-MAPD-T.pdf

Description:: IC EEPROM 1KBIT I2C 1MHZ 8UDFN

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Product details

Overview

AT24C01C-MAPD-T from Microchip Technology (formerly Atmel) is a 1-kilobit (128 × 8) automotive-grade serial EEPROM with I²C-compatible 2-wire interface, operating from 2.5V to 5.5V (Grade 1), rated for -40°C to +125°C, and packaged in an 8-pad UDFN (2.0 mm × 3.0 mm, 0.5 mm pitch). It delivers hardware write protection via the WP pin, 400 kHz clock support at 2.5V, and 8-byte page write capability - used for parameter storage in engine control units, airbag modules, and ADAS sensor calibration.

For engineers reviewing the AT24C01C-MAPD-T datasheet, AT24C01C-MAPD-T pinout, AT24C01C-MAPD-T application, or AT24C01C-MAPD-T equivalent, key selection criteria include Grade 1 automotive qualification, UDFN-8 package footprint compatibility, 1Kbit density with page-write efficiency, and I²C timing compliance under extended temperature and low-voltage conditions.

Technical Context

The AT24C01C-MAPD-T implements a fully synchronous I²C slave interface with Schmitt-triggered, noise-filtered SCL/SDA inputs and open-drain SDA output. Its internal architecture includes a 7-bit word address counter, page-addressable memory array organized as 16 pages × 8 bytes, and a high-voltage pump for EEPROM cell programming.

Write operations are self-timed (≤5 ms max), supported by acknowledge polling; read modes include current-address, random-address, and sequential reads. The device features hardware write protection via the WP pin, which disables all writes when pulled high, and supports up to 1,000,000 write cycles with 100-year data retention.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1,024 bits (128 words × 8 bits), sufficient for storing calibration coefficients, fault logs, or configuration flags in compact automotive ECUs.
Interface	I²C-compatible 2-wire serial bus with 400 kHz max clock frequency at 2.5V - enables direct connection to microcontroller I²C peripherals without level-shifting.
Supply Voltage	2.5V to 5.5V (Grade 1), supporting direct integration into 3.3V or 5V automotive power domains with no external regulator required.
Operating Temperature	-40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and transmission-control applications.
Write Endurance	1,000,000 write cycles - ensures reliable field updates over full vehicle lifetime, including frequent recalibration events.
Data Retention	100 years at 125°C - guarantees nonvolatile storage integrity across extended service intervals and thermal cycling.
Package	8-pad UDFN (2.0 mm × 3.0 mm, 0.5 mm pitch, 8MA2 footprint) - enables high-density PCB layouts in space-constrained modules like radar sensors or body controllers.

Pinout & Package

AT24C01C-MAPD-T is housed in an 8-pad Ultra Thin Dual No-Lead (UDFN) package (JEDEC MO-229, variant 8MA2), measuring 2.0 mm × 3.0 mm with 0.5 mm pitch and exposed thermal pad. Pin 1 is marked by a dot or chamfered corner.

Pin/Terminal	Circuit Role	Design Meaning
A0	Device Address Input	Hardwired address bit enabling up to eight 1K/2K devices on one I²C bus; tied to GND or VCC per system topology.
A1	Device Address Input	Second hardwired address bit; used with A0 and A2 to configure unique 7-bit I²C slave address (1010 A2 A1 A0 R/W).
A2	Device Address Input	Third hardwired address bit; determines device selectability in multi-EEPROM systems - essential for modular ECU designs.
GND	Ground Reference	Primary return path for VCC and signal currents; must be low-impedance and decoupled near the UDFN thermal pad.
VCC	Power Supply	Single 2.5–5.5V supply powering logic and EEPROM array; requires local 100 nF ceramic decoupling adjacent to pin.
WP	Write Protect Control	Active-high hardware lock: tied to VCC to disable all writes (full-array protection), or GND for normal read/write operation.
SCL	Serial Clock Input	Master-generated clock (max 400 kHz); Schmitt-triggered and filtered to reject EMI in noisy automotive environments.
SDA	Serial Data I/O	Open-drain bidirectional line shared across I²C bus; requires external pull-up (1.3 kΩ @ 2.5V) and supports wire-OR with other slaves.

Key Features

Feature	Design Value
Automotive Grade 1 Qualification	AEC-Q100 qualified for -40°C to +125°C operation - eliminates need for derating or additional thermal margining in powertrain applications.
Hardware Write Protection	WP pin provides fail-safe, zero-software-overhead data lock - critical for preserving safety-critical calibration data during firmware updates or brown-out events.
8-byte Page Write Mode	Enables burst writes of up to 8 bytes per transaction, reducing I²C bus occupancy by >70% vs. byte-wise writes - improves real-time responsiveness in time-sensitive ECUs.
Low Standby Current	Max 6.0 µA at 5.0V and 125°C - minimizes quiescent power draw in always-on modules such as telematics gateways or battery monitoring units.
Noise-Immune Inputs	Schmitt-triggered SCL/SDA with 50 ns noise suppression - prevents spurious clock/data transitions caused by coupled transients on 12V harnesses or ignition systems.

Applications

Engine Control Unit (ECU)	Advanced Driver Assistance Systems (ADAS)
Use Scenario: Storing fuel injection timing maps, knock sensor thresholds, and adaptive learning values that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during cranking voltage dips (down to 2.5V) and thermal extremes. Use Value: Enables closed-loop engine optimization without external backup power or supercapacitors - reduces BOM cost and board area.	Use Scenario: Retaining camera lens calibration offsets, radar object detection thresholds, and sensor fusion coefficients after vehicle shutdown. IC Role / Device Role / Timing Role: High-reliability configuration memory accessed during boot sequence; supports field updates via CAN-FD gateway. Use Value: Maintains ADAS accuracy over 15+ year vehicle lifespan with no degradation - validated for 1M write cycles and 100-year retention at 125°C.
Occupant Safety Module (Airbag)	Body Control Module (BCM)
Use Scenario: Logging crash event data (impact severity, seatbelt status, pretensioner deployment) for post-incident diagnostics and regulatory reporting. IC Role / Device Role / Timing Role: Crash-triggered write buffer with WP pin held active during deployment to prevent corruption from power rail collapse. Use Value: Meets ISO 26262 ASIL-B data integrity requirements via hardware-enforced write lock and AEC-Q100 Grade 1 qualification.	Use Scenario: Holding user preferences (window position, mirror angle, lighting profiles), door lock configuration, and battery state-of-charge history. IC Role / Device Role / Timing Role: Low-power, long-life memory accessible over I²C during sleep mode (ISB ≤ 6 µA at 5V/125°C). Use Value: Eliminates need for separate RTC-backed SRAM; reduces standby current by >90% vs. volatile alternatives in always-on BCM architectures.

Engine Control Unit (ECU)

Advanced Driver Assistance Systems (ADAS)

Use Scenario: Storing fuel injection timing maps, knock sensor thresholds, and adaptive learning values that persist across ignition cycles.

IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during cranking voltage dips (down to 2.5V) and thermal extremes.

Use Value: Enables closed-loop engine optimization without external backup power or supercapacitors - reduces BOM cost and board area.

Use Scenario: Retaining camera lens calibration offsets, radar object detection thresholds, and sensor fusion coefficients after vehicle shutdown.

IC Role / Device Role / Timing Role: High-reliability configuration memory accessed during boot sequence; supports field updates via CAN-FD gateway.

Use Value: Maintains ADAS accuracy over 15+ year vehicle lifespan with no degradation - validated for 1M write cycles and 100-year retention at 125°C.

Occupant Safety Module (Airbag)

Body Control Module (BCM)

Use Scenario: Logging crash event data (impact severity, seatbelt status, pretensioner deployment) for post-incident diagnostics and regulatory reporting.

IC Role / Device Role / Timing Role: Crash-triggered write buffer with WP pin held active during deployment to prevent corruption from power rail collapse.

Use Value: Meets ISO 26262 ASIL-B data integrity requirements via hardware-enforced write lock and AEC-Q100 Grade 1 qualification.

Use Scenario: Holding user preferences (window position, mirror angle, lighting profiles), door lock configuration, and battery state-of-charge history.

IC Role / Device Role / Timing Role: Low-power, long-life memory accessible over I²C during sleep mode (ISB ≤ 6 µA at 5V/125°C).

Use Value: Eliminates need for separate RTC-backed SRAM; reduces standby current by >90% vs. volatile alternatives in always-on BCM architectures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STMicroelectronics M24C01-RMN6TP	Same 1Kbit density, SO8 package (not UDFN); operates 1.7–5.5V (Grade 3, -40°C to +85°C); lacks AEC-Q100 Grade 1 qualification.	Targeted at industrial or consumer applications; unsuitable for under-hood or powertrain use due to limited temperature range.	Select only if Grade 1 qualification is unnecessary and SOIC footprint is preferred over UDFN.
Rohm BR24G01FJ-3GE2	1Kbit, UDFN-8 (2.0 × 2.5 mm), AEC-Q100 Grade 2 (-40°C to +105°C); 1.7–5.5V supply; supports 1 MHz I²C at 5V.	Higher speed but lower max temperature rating; not qualified for 125°C environments like transmission control units.	Prefer when 105°C operation suffices and higher I²C bandwidth is needed; verify thermal derating for 125°C zones.

Compared with M24C01-RMN6TP and BR24G01FJ-3GE2, the AT24C01C-MAPD-T uniquely combines UDFN-8 packaging, AEC-Q100 Grade 1 qualification, and guaranteed 2.5V minimum operation - making it the only option qualified for direct integration into high-temperature automotive subsystems without thermal or voltage margining.

Availability

AT24C01C-MAPD-T is available at Aetrix Electronics and suitable for engine control units, airbag modules, and ADAS sensor calibration requiring stable component supply across extended automotive lifecycles.

Supply support for AT24C01C-MAPD-T 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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with deep expertise in automotive and industrial reliability standards.

The AT24C01C-MAPD-T belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for robust, low-power, nonvolatile data storage in safety-critical vehicle subsystems operating under extreme thermal and electrical stress.

FAQ

What is the maximum I²C clock frequency supported by the AT24C01C-MAPD-T?

The AT24C01C-MAPD-T supports up to 400 kHz I²C clock frequency at VCC = 2.5V, and maintains full AC timing compliance across its entire operating range (-40°C to +125°C, 2.5V to 5.5V). This allows direct interface with standard microcontroller I²C peripherals without clock stretching or protocol adaptation. The AT24C01C-MAPD-T does not support 1 MHz operation - that capability is reserved for later-generation devices like the AT24CS series.

Does the AT24C01C-MAPD-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C01C-MAPD-T requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a Schmitt-triggered input without internal pull-ups. Recommended values are 1.3 kΩ for 2.5V operation and 10 kΩ for 1.7V operation, per the datasheet's AC measurement conditions. The AT24C01C-MAPD-T will not function correctly on an I²C bus without properly sized external pull-ups.

How does the Write Protect (WP) pin function on the AT24C01C-MAPD-T?

When the WP pin of the AT24C01C-MAPD-T is driven high (to VCC), all write operations - including byte, page, and erase - are disabled across the entire memory array. When WP is low (GND), normal read and write operations proceed. This hardware-level protection operates independently of I²C commands and remains active during power transitions, ensuring calibration data cannot be overwritten during firmware updates or brown-out conditions. The AT24C01C-MAPD-T does not support partial-array write protection.

What is the memory organization of the AT24C01C-MAPD-T?

The AT24C01C-MAPD-T contains 1,024 bits organized as 128 words of 8 bits each, internally segmented into 16 pages of 8 bytes. It uses a 7-bit word address for random access, and supports both byte-write and 8-byte page-write modes. Page boundaries are fixed at 8-byte intervals, and page writes automatically wrap within the same page - meaning writing beyond byte 7 of a page overwrites byte 0. This structure is explicitly defined for the AT24C01C-MAPD-T in the memory organization section of the datasheet.

Is the AT24C01C-MAPD-T compatible with standard I²C protocol stacks?

Yes, the AT24C01C-MAPD-T is fully compliant with the standard Phillips I²C-bus specification, including Start/Stop condition generation, 7-bit slave addressing (1010 A2 A1 A0 R/W), ACK/NACK handshaking, and repeated Start support. It requires no custom drivers and integrates seamlessly with off-the-shelf I²C software libraries used in AUTOSAR MCAL, FreeRTOS, or bare-metal firmware. All timing parameters (tLOW, tHIGH, tSU.STA, etc.) meet I²C Fast-mode specifications at 400 kHz, confirming interoperability with standard I²C masters.

AT24C01C-MAPD-T Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-UFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 1Kbit

Memory Organization:: 128 x 8

Memory Interface:: I2C

Clock Frequency:: 1 MHz

Write Cycle Time - Word, Page:: 5ms

Access Time:: 900 ns

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-UDFN (2x3)

AT24C01C-MAPD-T FAQ

1.How can I place an order for AT24C01C-MAPD-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT24C01C-MAPD-T 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 AT24C01C-MAPD-T reliable?

The price and inventory of AT24C01C-MAPD-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C01C-MAPD-T is usually 5 days.

3.What payment methods are accepted for AT24C01C-MAPD-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C01C-MAPD-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT24C01C-MAPD-T?

AT24C01C-MAPD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT24C01C-MAPD-T 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 AT24C01C-MAPD-T?

For technical support, including AT24C01C-MAPD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C01C-MAPD-T requirements.

6.How does Aetrix verify that AT24C01C-MAPD-T is sourced from the original manufacturer or authorized distributors?

All AT24C01C-MAPD-T 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 AT24C01C-MAPD-T meets industry standards.

7.What is the process for return or replacement of AT24C01C-MAPD-T?

All AT24C01C-MAPD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C01C-MAPD-T, 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 AT24C01C-MAPD-T part is unused and in its original packaging.

Return procedure for AT24C01C-MAPD-T:

1.Submit a request within 90 days.

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

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