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Microchip Technology AT24HC02B-TH-B
- Part No.:
- AT24HC02B-TH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24HC02B-TH-B.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,059
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Product details
Overview
AT24HC02B-TH-B from Microchip Technology is an automotive-grade I²C serial EEPROM with 2-Kbit (256 × 8) memory organization, operating from 2.5V to 5.5V over -40°C to +125°C, featuring hardware write protection via WP pin and 16-byte page write capability for robust nonvolatile data storage in engine control units and ADAS modules.
For engineers reviewing the AT24HC02B-TH-B datasheet, AT24HC02B-TH-B pinout, AT24HC02B-TH-B application, or AT24HC02B-TH-B equivalent, this device supports AEC-Q100 Grade 1 compliance, 400 kHz Fast-mode I²C interface, ultra-low standby current (≤18 μA), Schmitt-triggered inputs for noise immunity, and self-timed write cycles ≤5 ms - critical for safety-critical automotive firmware logging and calibration storage.
Technical Context
The AT24HC02B-TH-B implements a two-wire I²C slave interface with fixed device type identifier '1010', addressable via A1/A2 pins to support up to four devices on one bus. It uses internal high-voltage generation for EEPROM programming and integrates Power-on Reset (POR) with 100 µs tPUP delay to prevent spurious writes during power-up.
Memory is organized as 256 words of 8 bits, mapped into 16 pages of 16 bytes each. Write protection applies to the upper half (1K) when WP = VCC, and all pins - including NC - are defined per SOIC/TSSOP package pinout with internal pull-downs on A1, A2, and WP if left floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2-Kbit (256 × 8), enabling compact firmware parameter storage without external address latches |
| Supply voltage | 2.5V to 5.5V - compatible with 3.3V and 5V automotive microcontroller I/O domains |
| Temperature range | -40°C to +125°C (AEC-Q100 Grade 1) - qualified for under-hood ECU deployment |
| I²C speed | Up to 400 kHz Fast mode - supports real-time calibration updates without bus contention delays |
| Write endurance | 1,000,000 cycles - sufficient for lifetime logging of vehicle diagnostic events |
| Data retention | 100 years at 55°C - ensures calibration data integrity across full vehicle service life |
| Standby current | ≤18 μA at 5.0V - minimizes battery drain in always-on automotive modules |
| Page write size | 16 bytes per cycle - reduces I²C transaction overhead vs. byte-write-only devices |
Pinout & Package
AT24HC02B-TH-B is supplied in an 8-lead TSSOP package (TH suffix), pin-compatible with AT24HC04B and AT24HC08B. Package dimensions conform to JEDEC MO-153, with 0.65 mm lead pitch and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No-connect | Internally unconnected; must be left floating or tied to GND - no routing required |
| A1 | Hardware address input | Configures LSB of slave address (1010xxxA); pulled down internally if unconnected |
| A2 | Hardware address input | Configures MSB of slave address (1010xxxA); pulled down internally if unconnected |
| GND | Ground reference | System return path for VCC and I/O; requires low-impedance connection to PCB ground plane |
| SDA | Serial data bidirectional I/O | Open-drain line requiring external 1.3–10 kΩ pull-up; shares bus with other I²C slaves |
| SCL | Serial clock input | Master-generated clock; rising edge latches input, falling edge outputs data |
| WP | Write-protect control | High = protect upper 1K; low = full write access; internal pull-down enables default write-enable |
| VCC | Power supply | 2.5–5.5V source; must ramp monotonically at ≤0.1 V/µs to meet POR requirements |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 certified - validated for continuous operation at +125°C case temperature |
| Noise-immune interface | Schmitt-trigger inputs + spike suppression filters - reject >50 ns noise pulses on SDA/SCL |
| Hardware write protection | WP pin disables writes to upper 1K block - prevents accidental corruption of critical calibration data |
| Low-power standby | 1.6–18 μA ISB across 2.5–5.0V - extends backup battery life in telematics modules |
| Fast page writes | 16-byte writes complete in ≤5 ms - cuts firmware update time by 94% vs. 256 individual byte writes |
| Green packaging | Lead-free, halide-free, RoHS-compliant TSSOP - meets global automotive environmental mandates |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values and misfire counters that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage slave on I²C bus, accessed during key-on self-test and runtime calibration. Use Value: Enables closed-loop engine optimization without external FRAM or backup battery, leveraging 100-year data retention at 55°C. | Use Scenario: Logging camera calibration offsets and radar sensor alignment data after factory setup or field recalibration. IC Role / Device Role / Timing Role: Dedicated I²C EEPROM for safety-critical configuration storage, isolated from main MCU flash wear cycles. Use Value: Guarantees 1M write cycles for repeated recalibration events while meeting ASIL-B data integrity requirements. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Retaining user preferences (seat position, mirror angle, lighting profiles) across vehicle power-down. IC Role / Device Role / Timing Role: Low-quiescent-current I²C slave storing 256 bytes of NV user settings, accessed only at power-up and change events. Use Value: Achieves <18 μA standby draw - avoids parasitic battery drain exceeding OEM 20 μA limits. | Use Scenario: Storing audio equalizer presets, Bluetooth pairing tables, and display brightness history. IC Role / Device Role / Timing Role: Secondary I²C EEPROM offloading nonvolatile storage from main SoC, reducing flash wear and boot latency. Use Value: Enables 400 kHz Fast-mode transfers for rapid UI state restoration without blocking main processor I/O. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02D-SSHM-T | Same 2-Kbit capacity and I²C interface, but commercial-grade (-40°C to +85°C), no AEC-Q100 qualification | Not suitable for under-hood or safety-critical modules; limited to cabin infotainment or HVAC control | Select only for cost-sensitive non-automotive designs where extended temperature is unnecessary |
| M95256-DFMN6TP | 256-Kbit SPI EEPROM, 3.3V-only supply, no WP pin, 10 MHz interface - incompatible protocol and protection scheme | Requires MCU SPI peripheral instead of I²C; lacks hardware write protection for upper memory block | Choose only when migrating to SPI architecture and accepting software-based protection trade-offs |
Compared with AT24C02D-SSHM-T, the AT24HC02B-TH-B delivers guaranteed operation at +125°C and AEC-Q100 validation for functional safety systems; versus M95256-DFMN6TP, it preserves I²C bus compatibility and hardware-level write protection essential for automotive calibration integrity.
Availability
AT24HC02B-TH-B is available at Aetrix Electronics and suitable for engine control units, ADAS sensors, body control modules, and infotainment head units requiring stable component supply across automotive production lifecycles.
Supply support for AT24HC02B-TH-B 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO/TS 16949-certified automotive manufacturing.
The AT24HC02B-TH-B belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in harsh-temperature vehicle subsystems.
FAQ
What is the memory organization of the AT24HC02B-TH-B?
The AT24HC02B-TH-B contains 2-Kbit of EEPROM memory organized as 256 words × 8 bits, structured into 16 pages of 16 bytes each. This layout enables efficient 16-byte page writes and supports both random and sequential read operations. The device uses a 9-bit internal address space, with A8–A0 mapped across word address and device address bytes per I²C protocol.
Does the AT24HC02B-TH-B support AEC-Q100 qualification?
Yes, the AT24HC02B-TH-B is fully qualified to AEC-Q100 Grade 1 standards, with guaranteed operation from -40°C to +125°C case temperature. It undergoes stress testing for thermal cycling, humidity, and electrical reliability per automotive requirements. This qualification is documented in Microchip's official DS20006149A datasheet and applies specifically to the TH-B TSSOP variant.
What is the function of the WP pin on the AT24HC02B-TH-B?
The WP (Write-Protect) pin on the AT24HC02B-TH-B controls hardware-level write inhibition: when driven high (VCC), it blocks all write operations to the upper half (1K) of the memory array; when low (GND), full write access is enabled. If left unconnected, the pin is internally pulled down, enabling default write capability - but Microchip recommends hard-wiring it for deterministic behavior.
Can the AT24HC02B-TH-B operate at 3.3V?
Yes, the AT24HC02B-TH-B operates across 2.5V to 5.5V, making it fully compatible with 3.3V I/O systems. At VCC = 3.3V, it maintains 400 kHz Fast-mode I²C timing, ≤5 ms write cycle, and ≤18 μA standby current. DC characteristics including VOL (≤0.4V) and VIH (≥2.31V) are specified and tested across this full voltage range.
Is the AT24HC02B-TH-B pin-compatible with other AT24HCxxB devices?
Yes, the AT24HC02B-TH-B shares identical 8-lead TSSOP pinout and signal mapping with AT24HC04B and AT24HC08B, including NC, A1, A2, GND, SDA, SCL, WP, and VCC. This allows direct PCB footprint reuse across 2-Kbit, 4-Kbit, and 8-Kbit variants - though memory size and addressing differ, requiring firmware adaptation for larger arrays.
AT24HC02B-TH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT24HC02B-TH-B FAQ
1.How can I place an order for AT24HC02B-TH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24HC02B-TH-B 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 AT24HC02B-TH-B reliable?
The price and inventory of AT24HC02B-TH-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24HC02B-TH-B is usually 5 days.
3.What payment methods are accepted for AT24HC02B-TH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24HC02B-TH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24HC02B-TH-B?
AT24HC02B-TH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24HC02B-TH-B 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 AT24HC02B-TH-B?
For technical support, including AT24HC02B-TH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24HC02B-TH-B requirements.
6.How does Aetrix verify that AT24HC02B-TH-B is sourced from the original manufacturer or authorized distributors?
All AT24HC02B-TH-B 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 AT24HC02B-TH-B meets industry standards.
7.What is the process for return or replacement of AT24HC02B-TH-B?
All AT24HC02B-TH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24HC02B-TH-B, 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 AT24HC02B-TH-B part is unused and in its original packaging.
Return procedure for AT24HC02B-TH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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