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Microchip Technology 24LC04B/SN
- Part No.:
- 24LC04B/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC04B/SN.pdf
- Description:
- IC EEPROM 4KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
24LC04B/SN 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 hardware write-protection via the WP pin - used for nonvolatile parameter storage in embedded control systems.
For engineers reviewing the 24LC04B/SN datasheet, 24LC04B/SN pinout, 24LC04B/SN application, or 24LC04B/SN equivalent, this page delivers verified electrical specs, SOIC-8 package details, I²C timing constraints, endurance (1M cycles), and real-world use cases in industrial monitoring, automotive subsystems, and consumer device configuration.
Technical Context
The 24LC04B/SN implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. It supports standard-mode (100 kHz) and fast-mode (400 kHz) operation within its 2.5V–5.5V VCC range and uses an internal address pointer for sequential read/write operations.
Its memory architecture features a 16-byte page write buffer and self-timed erase/write cycles. Write protection is enforced by tying the WP pin to VCC, disabling all write commands while preserving full read access across the entire 000h–1FFh address space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (2 × 256 × 8-bit blocks), enabling compact firmware parameter storage without external address latches |
| VCC Range | 2.5V to 5.5V - compatible with 3.3V and 5V logic domains; excludes sub-2.5V operation unlike 24AA04/24FC04 |
| Max Clock Frequency | 400 kHz - supports fast-mode I²C for reduced transaction latency in real-time systems |
| Page Write Time | 5 ms maximum - defines worst-case delay before host can issue next command after Stop condition |
| Endurance | 1,000,000 erase/write cycles - ensures reliable field updates over 10+ years in telemetry logging applications |
| Data Retention | 200 years at +25°C - guarantees long-term integrity of calibration data and device identity stored during product lifetime |
| Operating Temp | -40°C to +85°C (Industrial) and -40°C to +125°C (Extended) - validated for under-hood automotive and factory-floor environments |
Pinout & Package
24LC04B/SN is supplied in an 8-lead narrow-body SOIC package (SN), measuring 3.90 mm × 4.90 mm × 1.75 mm, with gull-wing leads and JEDEC-standard 1.27 mm pitch.
| 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 per device architecture and not part of I²C client addressing |
| A2 | Address Input | No internal connection; reserved for future family expansion but unimplemented in 24LC04B |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O leakage currents; must be low-impedance |
| SDA | Serial Data I/O | Open-drain bidirectional bus line requiring external pull-up (2 kΩ typical for 400 kHz); carries addresses, data, and ACK/NACK |
| SCL | Serial Clock Input | Input-only synchronous timing signal generated by host controller; edge-triggered for Start/Stop detection |
| WP | Write-Protect Control | Active-high enable: tied to VCC disables all write operations (byte/page) while permitting unlimited reads |
| VCC | Power Supply | Single-supply input supporting 2.5V–5.5V; powers EEPROM array, logic, and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt Trigger Inputs | 0.05×VCC hysteresis on SDA/SCL enables robust operation on noisy PCB traces or long cables |
| Output Slope Control | Controlled rise/fall times prevent ground bounce-induced glitches during high-speed I²C transitions |
| 16-Byte Page Write Buffer | Reduces host CPU overhead by allowing up to 16 bytes per Stop-initiated write cycle instead of 16 separate byte writes |
| Hardware Write-Protection | WP pin provides tamper-resistant, non-software-dependent lockout of memory writes - critical for safety-critical settings |
| ESD Protection >4 kV | HBM-rated protection allows safe handling and board-level integration without additional transient suppression |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing temperature-compensation coefficients and sensor offset values during factory calibration of pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed once at power-up; no real-time timing constraints. Use Value: Eliminates need for external trimming components and enables field recalibration via I²C without firmware update. | Use Scenario: Holding seat position memory, mirror angle presets, and lighting configuration profiles in vehicle door modules. IC Role / Device Role / Timing Role: Persistent configuration storage updated infrequently (<100 writes/year) and read at boot. Use Value: Survives battery disconnect events and meets AEC-Q100 Grade 1 reliability requirements for automotive interiors. |
| Consumer Appliance UI Settings | Medical Device Usage Logs |
Use Scenario: Saving user-selected language, display brightness, and timer defaults in smart ovens and washing machines. IC Role / Device Role / Timing Role: Low-frequency write-on-change storage; accessed only during UI initialization or setting modification. Use Value: Enables RoHS-compliant, cost-effective retention without backup capacitors or supercapacitors. | Use Scenario: Recording cumulative operational hours, error counters, and last-fault timestamps in portable diagnostic equipment. IC Role / Device Role / Timing Role: Sequential append-only logging with timestamped entries written after each session. Use Value: Provides auditable service history with 200-year data retention and 1M-cycle endurance for regulatory compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA04-I/SN | Wider VCC range (1.7V–5.5V); lower 100 kHz max clock below 2.5V; identical pinout and memory map | Better suited for battery-powered devices operating near 1.8V; less suitable for fixed 3.3V/5V systems requiring 400 kHz speed | Select when ultra-low-voltage operation or extended battery life is prioritized over I²C throughput |
| AT24C04-PU | Same 4-Kbit size and SOIC-8 package; 1.8V–5.5V VCC; 400 kHz clock; requires external WP resistor network for full write protection | Lacks integrated hardware WP pin logic; relies on external pull-up/pull-down for protection state control | Choose if sourcing flexibility or legacy Atmel design reuse is required, accepting added BOM complexity for WP function |
Compared with 24LC04B/SN, the 24AA04-I/SN offers broader voltage support but sacrifices guaranteed 400 kHz performance below 2.5V, while the AT24C04-PU matches speed and package but shifts write-protection implementation to external components - impacting layout simplicity and fault tolerance.
Availability
24LC04B/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and consumer appliance UI settings requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified reliability.
Supply support for 24LC04B/SN 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.
The 24LC04B belongs to Microchip's 24XX04 family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in resource-constrained embedded systems across industrial, automotive, and consumer markets.
FAQ
What is the minimum VCC voltage required for reliable operation of the 24LC04B/SN?
The 24LC04B/SN requires a minimum VCC of 2.5V for guaranteed operation across its full specification - including 400 kHz I²C communication, 5 ms page write timing, and 1 µA standby current. Operation below 2.5V is not characterized and may result in undefined behavior, unlike the 24AA04 which supports down to 1.7V. Always verify VCC remains ≥2.5V during all functional states of the 24LC04B/SN.
Does the 24LC04B/SN support multi-master I²C bus configurations?
Yes, the 24LC04B/SN fully supports multi-master I²C buses as defined by the NXP I²C-bus specification. Its open-drain SDA/SCL pins, built-in arbitration logic, and clock synchronization capability allow seamless coexistence with other masters. The 24LC04B/SN acts solely as a slave device and never initiates bus transactions - all Start/Stop conditions and clock generation are controlled externally. This behavior is consistent across all operational modes of the 24LC04B/SN.
How does the WP pin function on the 24LC04B/SN, and what happens when it is left unconnected?
The WP pin on the 24LC04B/SN is an active-high hardware write-protection input: tying it to VCC disables all write operations (byte and page), while tying it to VSS enables full read/write access. When left unconnected (floating), the internal weak pull-down ensures WP defaults to VSS, enabling writes - but this is not recommended for production. For deterministic behavior, always explicitly tie WP to VSS or VCC per system security requirements in every 24LC04B/SN implementation.
Can the 24LC04B/SN be used interchangeably with the 24LC04B/P or 24LC04B/MS in the same PCB layout?
No - the 24LC04B/SN (SOIC-8, 3.90 mm body) has different mechanical dimensions and lead geometry than the 24LC04B/P (PDIP-8, 300 mil) or 24LC04B/MS (MSOP-8, 3 mm × 3 mm). Pin numbering and signal mapping are identical, but footprint, solder paste stencil, and reflow profile differ significantly. Substituting packages requires PCB redesign. All variants share identical electrical specs and functionality, but physical compatibility is limited to same-package codes like SN-to-SN or MS-to-MS in the 24LC04B/SN family.
What is the maximum number of bytes that can be written in a single page write operation of the 24LC04B/SN?
The 24LC04B/SN supports a maximum of 16 bytes per page write operation, aligned to physical page boundaries starting at addresses 00h, 10h, 20h, etc. Attempting to write across a 16-byte boundary causes wraparound within the current page - for example, writing 17 bytes starting at address 0Fh overwrites byte 00h with the 17th byte. Host firmware must enforce page alignment; the 24LC04B/SN does not perform automatic boundary checking. This limit applies uniformly across all 24LC04B/SN operating conditions.
24LC04B/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
24LC04B/SN FAQ
1.How can I place an order for 24LC04B/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC04B/SN 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 24LC04B/SN reliable?
The price and inventory of 24LC04B/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC04B/SN is usually 5 days.
3.What payment methods are accepted for 24LC04B/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC04B/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC04B/SN?
24LC04B/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC04B/SN 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 24LC04B/SN?
For technical support, including 24LC04B/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC04B/SN requirements.
6.How does Aetrix verify that 24LC04B/SN is sourced from the original manufacturer or authorized distributors?
All 24LC04B/SN 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 24LC04B/SN meets industry standards.
7.What is the process for return or replacement of 24LC04B/SN?
All 24LC04B/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC04B/SN, 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 24LC04B/SN part is unused and in its original packaging.
Return procedure for 24LC04B/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC04B/SN Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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