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Microchip Technology AT24HC04BN-SH-B
- Part No.:
- AT24HC04BN-SH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24HC04BN-SH-B.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,612
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Product details
Overview
AT24HC04BN-SH-B from Microchip Technology is a 4-Kbit I²C-compatible serial EEPROM organized as 512 × 8, operating from 1.8V to 5.5V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support at 4.5–5.5V, and hardware write-protection for upper-half memory array. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT24HC04BN-SH-B datasheet, AT24HC04BN-SH-B pinout, AT24HC04BN-SH-B application, or AT24HC04BN-SH-B equivalent, key selection criteria include voltage compatibility (1.8–5.5V), I²C bus speed mode support (Standard/ Fast/ Fast Mode Plus), page write capability (16-byte), write endurance (1M cycles), and hardware WP pin functionality for partial-array protection.
Technical Context
The AT24HC04BN-SH-B implements a two-wire I²C slave interface with Schmitt-triggered, filtered SDA/SCL inputs for noise immunity and supports bidirectional data transfer with ACK/NACK protocol. Its internal architecture includes a 9-bit address decoder, high-voltage generation circuit for EEPROM programming, and hardware address comparator using A1/A2 pins.
It features cascaded bus operation-up to four devices share one I²C bus via hardwired A1/A2 address inputs-and integrates Power-on Reset (POR) with 100 µs tPUP delay and VPOR = 1.5 V threshold. Write protection is implemented via dedicated WP pin controlling upper-half (2K-bit) array access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,096 bits (512 × 8), enabling storage of firmware flags, calibration coefficients, or device ID strings |
| Supply Voltage | 1.8 V to 5.5 V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifting |
| I²C Speed Modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (Fast Mode Plus @ 4.5–5.5V) - enables scalable timing for low- and high-throughput systems |
| Write Cycle Time | ≤5 ms max - ensures predictable timeout handling in real-time firmware during nonvolatile updates |
| Endurance & Retention | 1,000,000 write cycles / 100-year data retention at 55°C - meets long-life requirements in industrial field equipment |
| Current Consumption | ≤3 mA active (5V, 100 kHz read), ≤18 µA standby (5V) - suitable for battery-backed or energy-constrained nodes |
| Operating Temp | −40°C to +85°C - qualified for deployment in automotive cabin modules, industrial PLCs, and outdoor IoT gateways |
Pinout & Package
AT24HC04BN-SH-B is supplied in an 8-lead SOIC package (SH suffix per Microchip part numbering). Pin functions are identical across PDIP, SOIC, and TSSOP variants per DS20006150A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No Connect | Unused pin; must remain unconnected - no internal function or pull-up/down |
| A1 | Hardware Device Address Input | Configures LSB of 3-bit slave address; tied high/low to enable up to four devices on same I²C bus |
| A2 | Hardware Device Address Input | Configures MSB of 3-bit slave address; used with A1 to select one of four possible addresses (1010xx0/1) |
| GND | Ground Reference | System return path for VCC and all I/O; requires low-impedance connection to minimize noise coupling |
| SDA | Serial Data Line | Open-drain bidirectional I²C data line; requires external pull-up resistor (≤10 kΩ) and wire-OR capability |
| SCL | Serial Clock Line | Input-only clock line; rising edge latches input data, falling edge outputs data; pull-up required |
| WP | Write-Protect Control | Active-high pin disabling writes to upper 2K-bit memory block when driven to VCC; internally pulled down if floating |
| VCC | Power Supply | Core supply input (1.8–5.5 V); must ramp monotonically at ≤0.1 V/µs and stabilize ≥100 µs before first command |
Key Features
| Feature | Design Value |
|---|---|
| 16-byte Page Write | Enables burst writes within single page boundary; partial-page writes supported without erasing full page |
| Schmitt Trigger Inputs | Provides hysteresis on SDA/SCL to reject noise spikes <50 ns (Fast Mode) or <40 ns (FM+), improving bus robustness |
| Hardware WP Pin | Allows selective lock of upper 2K-bit memory segment while permitting writes to lower half - ideal for preserving factory settings |
| Ultra-Low Standby Current | As low as 0.6 µA at 1.8 V - extends battery life in always-on monitoring sensors and backup power systems |
| Green Packaging | RoHS-compliant, halide-free, lead-free SOIC - satisfies environmental compliance for global industrial and medical products |
Applications
| Industrial Sensor Calibration | Smart Meter Firmware Storage |
|---|---|
|
Use Scenario: Storing temperature-compensation coefficients and sensor offset values during factory calibration and field recalibration. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent analog front-end tuning parameters accessed at system boot. Use Value: Enables field-upgradable calibration without requiring reprogramming of main MCU flash; retains data across 100+ years under 55°C ambient. |
Use Scenario: Holding tariff tables, billing history, and communication module credentials in electricity/water/gas meters. IC Role / Device Role / Timing Role: Secure, low-power configuration and event-log storage accessible via I²C during meter wake-up cycles. Use Value: Supports 1M write cycles for daily usage logging and maintains integrity during brownout events due to fast 5 ms write completion. |
| Embedded Controller Configuration | Medical Device Parameter Backup |
|
Use Scenario: Saving user-defined operational modes, network settings, and alarm thresholds in HVAC controllers and PLC I/O modules. IC Role / Device Role / Timing Role: System-level parameter store interfaced directly by ARM Cortex-M host over 400 kHz I²C bus. Use Value: Hardware WP pin protects critical boot configuration from accidental overwrite during firmware updates via separate MCU GPIO control. |
Use Scenario: Backing up patient-specific therapy parameters and device calibration data in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Fail-safe data retention element compliant with IEC 62304 Class C software requirements. Use Value: 100-year data retention at 55°C and −40°C to +85°C operating range ensure reliability across clinical environments and transport conditions. |
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 4-Kbit density, but uses newer process with 1.7–5.5 V range and enhanced ESD (>4 kV); no NC pin - A1/A2 relocated to pins 2/3 as in AT24HC04B | Supports wider VCC range and higher noise immunity; pinout differs (no NC), requiring PCB layout update | Select when upgrading legacy designs for improved robustness and broader voltage margin; verify A1/A2 routing matches new pin map. |
| M24C04-RMN6TP | 4-Kbit I²C EEPROM from STMicroelectronics; supports 1.8–5.5 V, 400 kHz max, no Fast Mode Plus; WP pin present but lacks FM+ timing spec | Limited to 400 kHz bus speed; no 1 MHz operation - unsuitable where high-speed parameter loading is required | Choose for cost-sensitive industrial controls where 400 kHz suffices and cross-manufacturer second sourcing is needed; confirm WP logic matches. |
Compared with AT24HC04BN-SH-B, AT24C04D-SSHM-T offers extended voltage range and ESD rating but requires board revision, while M24C04-RMN6TP provides functional equivalence at lower speed and different qualification pedigree - neither is pin-compatible without layout change.
Availability
AT24HC04BN-SH-B is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and embedded controller configuration requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT24HC04BN-SH-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 9001-certified quality systems and global manufacturing.
The AT24HC04BN-SH-B belongs to Microchip's AT24HC serial EEPROM product line, designed specifically for low-voltage, low-power, industrial-grade nonvolatile data storage in space-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the AT24HC04BN-SH-B?
The AT24HC04BN-SH-B supports three I²C speed modes: 100 kHz Standard mode (1.8–5.5 V), 400 kHz Fast mode (1.8–5.5 V), and 1 MHz Fast Mode Plus (FM+) at 4.5–5.5 V only. Operation above 400 kHz requires VCC ≥ 4.5 V and adherence to FM+ AC timing specs including tLOW ≤ 500 ns and tHIGH ≤ 400 ns. The AT24HC04BN-SH-B does not support FM+ below 4.5 V.
How does the Write-Protect (WP) pin function on the AT24HC04BN-SH-B?
On the AT24HC04BN-SH-B, the WP pin disables write operations to the upper half (2K-bit) of the memory array when driven high (to VCC); writes to the lower half remain enabled. When WP is low (GND) or floating, full-array writes are permitted. Internally, WP is pulled down, but Microchip recommends hardwiring it to avoid noise-induced state transitions. The AT24HC04BN-SH-B does not support byte-level or software-based write protection.
What package type does the AT24HC04BN-SH-B use, and what does "SH" signify?
The AT24HC04BN-SH-B uses an 8-lead SOIC package. In Microchip's part numbering, the "SH" suffix explicitly denotes the SOIC narrow-body (0.150-inch width) variant. This differs from "SN" (TSSOP) and "PD" (PDIP). The "N" in the full part number indicates lead-free, RoHS-compliant finish, and "B" denotes the specific revision level per DS20006150A.
Can the AT24HC04BN-SH-B operate reliably at 1.8 V, and what performance trade-offs apply?
Yes, the AT24HC04BN-SH-B is fully specified for 1.8 V operation across all modes: 100 kHz and 400 kHz I²C, standby current ≤3.0 µA, and write cycle time ≤5 ms. However, at 1.8 V, Fast Mode Plus (1 MHz) is not supported, and AC parameters such as tLOW (min 1200 ns) and tBUF (min 1200 ns) are relaxed versus 5 V operation. The AT24HC04BN-SH-B maintains full functionality including WP control and page write at 1.8 V.
What is the memory organization and addressing scheme of the AT24HC04BN-SH-B?
The AT24HC04BN-SH-B organizes its 4-Kbit memory as 512 words × 8 bits, grouped into 32 pages of 16 bytes each. Device addressing uses a 7-bit slave address: fixed prefix "1010", followed by A2/A1 hardware inputs (pins 2/3), then R/W bit. Word addressing uses a 9-bit value transmitted after the device address - bits A8–A0 - where A8 is sent in the device address byte and A7–A0 follow in the word address byte. The AT24HC04BN-SH-B does not support 16-bit addressing or extended memory maps.
AT24HC04BN-SH-B 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:
- 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-SOIC
AT24HC04BN-SH-B FAQ
1.How can I place an order for AT24HC04BN-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24HC04BN-SH-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 AT24HC04BN-SH-B reliable?
The price and inventory of AT24HC04BN-SH-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24HC04BN-SH-B is usually 5 days.
3.What payment methods are accepted for AT24HC04BN-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24HC04BN-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24HC04BN-SH-B?
AT24HC04BN-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24HC04BN-SH-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 AT24HC04BN-SH-B?
For technical support, including AT24HC04BN-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24HC04BN-SH-B requirements.
6.How does Aetrix verify that AT24HC04BN-SH-B is sourced from the original manufacturer or authorized distributors?
All AT24HC04BN-SH-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 AT24HC04BN-SH-B meets industry standards.
7.What is the process for return or replacement of AT24HC04BN-SH-B?
All AT24HC04BN-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24HC04BN-SH-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 AT24HC04BN-SH-B part is unused and in its original packaging.
Return procedure for AT24HC04BN-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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