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Microchip Technology 24LC04BT/ST
- Part No.:
- 24LC04BT/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC04BT/ST.pdf
- Description:
- IC EEPROM 4KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,108
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Product details
Overview
24LC04BT/ST from Microchip Technology Inc. is a 4-Kbit I²C-compatible serial EEPROM organized as two 256 × 8-bit blocks, operating from 2.5V to 5.5V with 400 kHz max clock frequency, 5 ms max page write time, and industrial temperature range (–40°C to +85°C). It features hardware write-protection via the WP pin and supports up to 16-byte page writes in SOIC-8 packaging.
For engineers reviewing the 24LC04BT/ST datasheet, 24LC04BT/ST pinout, 24LC04BT/ST application, or 24LC04BT/ST equivalent, this device serves as a low-power, AEC-Q100-qualified nonvolatile memory for firmware storage, calibration data retention, and configuration parameter backup in space-constrained embedded systems.
Technical Context
The 24LC04BT/ST implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while ACK polling allows host-driven timing control during write cycles.
Memory organization uses a 9-bit effective address (B0 + A7–A0), where B0 selects one of two 256-word blocks. The device ignores A0–A2 pins-no internal connection-and relies on external pull-up resistors (e.g., 2 kΩ for 400 kHz) on SDA/SCL lines per I²C specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 bytes), split into two independent 256-byte blocks for selective access |
| Interface | I²C-compatible two-wire serial bus, supporting standard-mode (100 kHz), fast-mode (400 kHz) |
| VCC Range | 2.5V to 5.5V - ensures compatibility with 3.3V and 5V logic domains without level shifting |
| Write Cycle Time | ≤5 ms per byte or page - enables rapid configuration updates without blocking host CPU for extended periods |
| Endurance | 1,000,000 erase/write cycles - supports frequent recalibration or logging in industrial controllers |
| Data Retention | ＞200 years at +85°C - guarantees long-term reliability for unattended equipment deployments |
| ESD Protection | >4,000 V HBM - enhances robustness in handling-sensitive manufacturing and field service environments |
Pinout & Package
24LC04BT/ST is supplied in an 8-lead SOIC (SN) package with 3.90 mm body width and 1.27 mm pitch. Pin 1 is marked with a beveled corner or dot; orientation follows JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Address Input | No internal connection - may be left floating or tied to VSS/VCC without affecting operation |
| A1 | Address Input | No internal connection - unused; no impact on device addressing or functionality |
| A2 | Address Input | No internal connection - reserved for family compatibility but not implemented in 24LC04B series |
| VSS | Ground | Reference node for all digital and analog circuitry; must be low-impedance connection to system GND |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up; carries addresses, commands, and data |
| SCL | Serial Clock Input | Input-only clock line synchronized to host controller; defines timing for all bus transactions |
| WP | Write-Protect Control | Active-high enable: tied to VCC disables all writes; tied to VSS enables full read/write access |
| VCC | Power Supply | Primary supply rail (2.5–5.5V); decoupling capacitor (0.1 µF) required near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Buffer | 16-byte on-chip buffer enables burst programming of contiguous locations without repeated Start/Stop overhead |
| Schmitt Trigger Inputs | Hysteresis ≥0.05×VCC on SDA/SCL rejects transient noise up to 50 ns, improving bus reliability in EMI-prone environments |
| Hardware Write-Protection | Single-pin (WP) global lock prevents accidental overwrites during power transitions or firmware glitches |
| Low-Power Operation | 1 µA max standby current at I-temp enables always-on memory retention in battery-backed systems |
| AEC-Q100 Qualification | Qualified for automotive applications - validated for temperature cycling, humidity, and mechanical stress per Grade 2 requirements |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles across ignition cycles in entry-level vehicles. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding user-defined settings accessible via microcontroller I²C master. Use Value: Enables zero-power retention of personalized settings without supercapacitor or backup battery support. | Use Scenario: Saving ladder logic parameters, I/O mapping, and calibration offsets during firmware updates or power loss events. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM interfaced to PLC's ARM Cortex-M host processor. Use Value: Guarantees deterministic startup behavior and eliminates manual reconfiguration after maintenance. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Patching |
Use Scenario: Recording flow-rate calibration coefficients and sensor drift compensation values during factory calibration and field servicing. IC Role / Device Role / Timing Role: Tamper-resistant memory storing critical safety-critical calibration data accessed only by authenticated firmware. Use Value: Supports traceable, auditable calibration history with >200-year data integrity under continuous operation. | Use Scenario: Hosting incremental firmware patches downloaded over HAN (Home Area Network) to extend meter lifetime without full reflash. IC Role / Device Role / Timing Role: Secure boot auxiliary storage holding verified patch signatures and version metadata prior to execution. Use Value: Enables field-upgradable functionality while maintaining cryptographic integrity checks on each patch load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA04T/ST | Wider VCC range (1.7–5.5V); lower 100 kHz max clock below 2.5V; same pinout and block structure | Better suited for single-cell Li-ion or energy-harvesting systems requiring sub-2.5V operation | Select when main supply drops below 2.5V; verify clock speed derating in low-VCC conditions |
| AT24C04-PU | Same 4-Kbit capacity and SOIC-8 package; supports 1 MHz clock; no AEC-Q100 qualification | Lacks automotive qualification and extended temperature validation; higher max clock enables faster bulk writes | Prefer for cost-sensitive consumer electronics where AEC-Q100 is unnecessary and 1 MHz throughput is beneficial |
Compared with 24AA04T/ST and AT24C04-PU, the 24LC04BT/ST offers optimal balance of automotive qualification, industrial temperature margin, and proven 400 kHz I²C performance - making it ideal for safety-aware embedded systems where reliability outweighs raw speed.
Availability
24LC04BT/ST is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC configuration storage, and medical infusion pump calibration requiring stable component supply and long-term lifecycle assurance.
Supply support for 24LC04BT/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 24LC04B series belongs to Microchip's serial EEPROM product line, engineered for robust, low-power nonvolatile data storage in automotive, industrial, and medical applications demanding high endurance and long-term data integrity.
FAQ
What is the maximum clock frequency supported by the 24LC04BT/ST?
The 24LC04BT/ST supports a maximum I²C clock frequency of 400 kHz across its specified VCC range of 2.5V to 5.5V. At voltages below 2.5V, operation is not guaranteed per datasheet specifications - unlike the 24AA04 variant, which supports 100 kHz down to 1.7V. This 400 kHz limit ensures reliable timing margins for ACK polling and page write completion within 5 ms.
Does the 24LC04BT/ST require external pull-up resistors on SDA and SCL lines?
Yes, the 24LC04BT/ST requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. For 400 kHz operation, a typical value is 2 kΩ to VCC. Incorrect pull-up values can cause bus timing violations, failed ACKs, or intermittent communication - especially under capacitive loads exceeding 400 pF.
How does the WP pin function on the 24LC04BT/ST?
The WP (Write-Protect) pin on the 24LC04BT/ST is an active-high input that globally disables all write operations when pulled to VCC. When tied to VSS (or left floating, though not recommended), full read/write access is enabled. This hardware-level protection prevents accidental overwrites during power-up/down sequences or firmware errors - a critical safeguard for calibration and configuration data.
Can the 24LC04BT/ST be used in automotive applications?
Yes, the 24LC04BT/ST is AEC-Q100 qualified for automotive use and rated for the industrial temperature range (–40°C to +85°C). Its qualification covers stress testing for temperature cycling, humidity, and mechanical shock - confirming suitability for body control modules, dashboard instrumentation, and other non-safety-critical vehicle subsystems where reliable nonvolatile memory is essential.
What is the memory organization of the 24LC04BT/ST?
The 24LC04BT/ST contains 4 Kbit (512 bytes) of EEPROM organized as two independent 256 × 8-bit blocks. Addressing uses a 9-bit word address where bit B0 selects the block (0 = Block 0, 1 = Block 1), and bits A7–A0 select the byte within the block. Pins A0–A2 are not internally connected and have no effect on addressing or operation.
24LC04BT/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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 256 x 8 x 2
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24LC04BT/ST FAQ
1.How can I place an order for 24LC04BT/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC04BT/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 24LC04BT/ST reliable?
The price and inventory of 24LC04BT/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC04BT/ST is usually 5 days.
3.What payment methods are accepted for 24LC04BT/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC04BT/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC04BT/ST?
24LC04BT/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC04BT/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 24LC04BT/ST?
For technical support, including 24LC04BT/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC04BT/ST requirements.
6.How does Aetrix verify that 24LC04BT/ST is sourced from the original manufacturer or authorized distributors?
All 24LC04BT/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 24LC04BT/ST meets industry standards.
7.What is the process for return or replacement of 24LC04BT/ST?
All 24LC04BT/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC04BT/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 24LC04BT/ST part is unused and in its original packaging.
Return procedure for 24LC04BT/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC04BT/ST Tags
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AT24C02C-XHM-T
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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