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Microchip Technology AT24C04B-TH-B
- Part No.:
- AT24C04B-TH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C04B-TH-B.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,689
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Product details
Overview
AT24C04B-TH-B from Microchip Technology is a 4-kilobit (512 × 8) two-wire serial EEPROM with 1.8 V to 5.5 V operation, 1 MHz I²C compatibility at 5 V, hardware write protection via WP pin, and 16-byte page write capability. It delivers high-reliability nonvolatile storage for embedded systems requiring low-power, space-constrained memory in industrial temperature range (–40°C to +85°C).
For engineers reviewing the AT24C04B-TH-B datasheet, AT24C04B-TH-B pinout, AT24C04B-TH-B application, or AT24C04B-TH-B equivalent, key selection criteria include its TSSOP-8 package (8A2), 1 million write cycles endurance, 100-year data retention, Schmitt-trigger noise-immune inputs, and support for partial page writes in battery-powered and automotive subsystems.
Technical Context
The AT24C04B-TH-B implements a standard I²C-compatible two-wire interface with open-drain SDA and edge-triggered SCL, supporting bidirectional data transfer and acknowledge polling during internal write cycles. Its internal architecture includes a 9-bit word address counter, 32-page × 16-byte memory organization, and hardware-based write protection logic tied to the WP pin state.
It uses an internal high-voltage pump and timing circuitry to execute self-timed write operations within 5 ms maximum, while maintaining full functionality across 1.8 V to 5.5 V supply and –40°C to +85°C ambient. Input filtering and Schmitt-trigger thresholds ensure robust operation in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4096 bits (512 words × 8 bits); supports firmware parameter storage and calibration data logging |
| Interface | Two-wire I²C-compatible; enables shared bus connectivity with microcontrollers without additional GPIO overhead |
| Write cycle time | Max 5 ms; allows predictable timing budgeting for host firmware during nonvolatile updates |
| Endurance | 1 million write cycles; supports frequent configuration updates in field-deployed equipment |
| Data retention | 100 years at +25°C; ensures long-term validity of stored settings without refresh |
| Operating voltage | 1.8 V to 5.5 V; interoperable with 1.8 V logic, 3.3 V MCU I/O, and legacy 5 V systems |
| Package | 8-lead TSSOP (8A2, 4.4 mm body); provides compact footprint and thermal performance for dense PCB layouts |
Pinout & Package
AT24C04B-TH-B is housed in an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), designated 8A2 per Microchip's ordering scheme - measuring 3.00 mm × 4.40 mm body with 0.65 mm lead pitch and 0.45–0.75 mm lead length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | No-connect (NC) | Internally unused; must be grounded or left floating per design - no effect on device addressing |
| 2 (A1) | No-connect (NC) | Not used in AT24C04B; hard-wired address bits A2/A1 define up to four devices on same bus |
| 3 (A2) | Hardware address input | Configures device I²C address (1010xx0/1); enables multi-device bus topology with fixed slave addressing |
| 4 (GND) | Ground reference | Provides return path for all internal circuits and I/O; requires low-impedance connection to system ground plane |
| 5 (SDA) | Serial data bidirectional I/O | Open-drain line shared across I²C bus; requires external pull-up resistor (typically 2.2–10 kΩ) |
| 6 (SCL) | Serial clock input | Positive-edge sampled clock; controls timing of data sampling and acknowledge generation |
| 7 (WP) | Write protect control | Active-high hardware lock: ties entire memory array read-only when pulled to VCC |
| 8 (VCC) | Power supply | Accepts 1.8–5.5 V; decoupling capacitor (0.1 µF ceramic) required near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger filtered inputs | Rejects fast transients and EMI-induced glitches on SCL/SDA, eliminating need for external RC filtering |
| 16-byte page write mode | Reduces I²C transaction count by up to 16× versus byte-write, lowering bus occupancy and host CPU load |
| Partial page write support | Allows writing fewer than 16 bytes into a page without overwriting adjacent locations - simplifies small-data updates |
| Self-timed internal write cycle | Removes requirement for host to manage precise write timing; ACK polling confirms completion |
| Industrial temperature range | Rated for –40°C to +85°C operation, enabling use in automotive cabin modules and outdoor industrial controllers |
Applications
| Smart Meter Calibration Storage | Automotive Body Control Module |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients, tariff tables, and tamper-event logs in utility smart meters operating on lithium primary batteries. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed infrequently via I²C; retains data through 15+ year battery life with zero standby current draw. Use Value: Enables field-upgradable calibration without firmware reflash; 100-year retention guarantees accuracy compliance over product lifetime. | Use Scenario: Holding seat position presets, mirror angle configurations, and lighting profiles in automotive BCMs powered by 12 V battery with LDO regulation. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced to 3.3 V MCU; WP pin tied to ignition signal to prevent accidental writes during power transitions. Use Value: Survives cold-cranking voltage dips down to 1.8 V; 1M endurance supports daily user adjustments over 10+ years. |
| Industrial PLC Configuration Memory | Medical Infusion Pump Settings |
Use Scenario: Saving I/O mapping, PID tuning parameters, and alarm thresholds in DIN-rail mounted programmable logic controllers exposed to factory floor EMI. IC Role / Device Role / Timing Role: Robust I²C slave with Schmitt-trigger inputs; operates reliably in noisy 24 V DC environments with minimal layout sensitivity. Use Value: Eliminates need for external noise filters; page-write capability reduces configuration save time from ~120 ms to <10 ms. | Use Scenario: Securing drug library definitions, dose limits, and clinician access codes in battery-backed infusion pumps requiring FDA Class II compliance. IC Role / Device Role / Timing Role: Tamper-resistant memory with hardware WP; stores safety-critical data validated before each therapy session. Use Value: Prevents unauthorized modification of therapeutic parameters; 100-year retention satisfies medical device long-term traceability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C04D-SSHM-T | Same 4K capacity and TSSOP-8 package, but newer revision with enhanced ESD rating (4 kV HBM) and tighter tAA (0.05 µs typ at 5 V) | Preferred for new designs targeting higher reliability in electrostatic-prone assembly environments | Select AT24C04D-SSHM-T if ESD robustness and faster read access are prioritized over legacy qualification status |
| M24C04-RMN6TP | 4K I²C EEPROM in identical TSSOP-8 (8A2) package; supports 1.7–5.5 V, but max clock frequency limited to 400 kHz across full voltage range | Better suited for cost-sensitive consumer electronics where 1 MHz speed is unnecessary | Choose M24C04-RMN6TP when supply voltage margin is tight below 1.8 V or when 400 kHz bus timing suffices |
Compared with AT24C04B-TH-B, AT24C04D-SSHM-T offers improved ESD tolerance and faster read timing, while M24C04-RMN6TP trades peak speed for broader sub-1.8 V operation - both require validation of WP pin behavior and page write boundary handling in existing firmware.
Availability
AT24C04B-TH-B is available at Aetrix Electronics and suitable for smart meter calibration storage, automotive body control modules, industrial PLC configuration memory, and medical infusion pump settings requiring stable component supply across extended production lifecycles.
Supply support for AT24C04B-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 for industrial, automotive, and communications markets.
The AT24C04B series belongs to Microchip's legacy two-wire serial EEPROM product line, designed specifically for reliable, low-power, pin-efficient nonvolatile storage in resource-constrained embedded systems.
FAQ
What is the memory organization of the AT24C04B-TH-B?
The AT24C04B-TH-B contains 4096 bits organized as 512 words of 8 bits each, internally structured into 32 pages of 16 bytes. This enables efficient page-write operations and supports random word addressing using a 9-bit data word address. The AT24C04B-TH-B uses hardware address pins A2 and A1 to configure its I²C device address, with A0 as no-connect.
Does the AT24C04B-TH-B support 1.8 V operation?
Yes, the AT24C04B-TH-B is fully specified for 1.8 V to 5.5 V operation, with guaranteed 400 kHz I²C communication at 1.8 V and up to 1 MHz at 5.0 V. Its low-voltage design includes Schmitt-trigger inputs and optimized internal charge pump, making it suitable for battery-powered and energy-harvesting systems where supply rails dip near 1.8 V.
How does the Write Protect (WP) pin function on the AT24C04B-TH-B?
On the AT24C04B-TH-B, the WP pin provides hardware-level write protection: when pulled high to VCC, the entire memory array becomes read-only; when grounded, normal read/write operations are enabled. This feature prevents accidental or malicious overwrites during power-up, brown-out, or firmware faults - critical for safety- and mission-critical applications.
What package type is used for the AT24C04B-TH-B?
The AT24C04B-TH-B uses an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), designated 8A2 per Microchip's packaging code. It measures 3.00 mm × 4.40 mm body with 0.65 mm lead pitch and is RoHS-compliant with NiPdAu lead finish. This package offers superior thermal dissipation and board-space efficiency compared to SOIC or PDIP variants.
Can the AT24C04B-TH-B perform partial page writes?
Yes, the AT24C04B-TH-B supports partial page writes: the host may transmit 1 to 16 bytes within a single page boundary without overwriting remaining bytes. The internal address counter auto-increments only the lower 4 bits, preserving higher address bits to stay within the selected 16-byte page. This capability simplifies small-data updates and avoids unnecessary full-page erases.
AT24C04B-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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 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
AT24C04B-TH-B FAQ
1.How can I place an order for AT24C04B-TH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C04B-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 AT24C04B-TH-B reliable?
The price and inventory of AT24C04B-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 AT24C04B-TH-B is usually 5 days.
3.What payment methods are accepted for AT24C04B-TH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C04B-TH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C04B-TH-B?
AT24C04B-TH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C04B-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 AT24C04B-TH-B?
For technical support, including AT24C04B-TH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C04B-TH-B requirements.
6.How does Aetrix verify that AT24C04B-TH-B is sourced from the original manufacturer or authorized distributors?
All AT24C04B-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 AT24C04B-TH-B meets industry standards.
7.What is the process for return or replacement of AT24C04B-TH-B?
All AT24C04B-TH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C04B-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 AT24C04B-TH-B part is unused and in its original packaging.
Return procedure for AT24C04B-TH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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