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Asahi Kasei Microdevices/AKM AK6440BH
- Part No.:
- AK6440BH
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Category:
- Memory
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
AK6440BH.pdf
- Description:
- IC EEPROM 4KBIT SPI 1MHZ 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,076
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Product details
Overview
AK6440BH from Asahi Kasei Microdevices is a 4096-bit (256 × 16) serial CMOS EEPROM with 1.8V–5.5V supply operation, 1 MHz max clock frequency at VCC = 2.5V, and integrated auto-erase/write timeout-designed for low-density non-volatile data storage in microcontroller-based sensor calibration and configuration modules.
For engineers reviewing the AK6440BH datasheet, AK6440BH pinout, AK6440BH application, or AK6440BH equivalent, this device supports direct interface to 3-line negative-clock synchronous serial ports, offers software/hardware write protection, Ready/Busy status via DO pin, and ultra-low 0.8 µA standby current-key selection criteria for battery-powered IoT nodes and industrial control firmware storage.
Technical Context
The AK6440BH implements a synchronous serial interface with rising-edge DI sampling and falling-edge DO output, supporting four instructions (READ, WRITE, WREN, WRDS) encoded as 8-bit op-code + 8-bit address + 16-bit data. Its internal charge pump generates high voltage for write operations without external VPP.
It features automatic address increment during READ, hardware RESET-controlled write inhibition, and dual-mode write protection: WREN/WRDS software control plus RESET pin assertion. The DO pin serves triple function-data output, Ready/Busy status indicator, and high-impedance default state-enabling shared bus use with minimal external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits organized as 256 × 16-bit words-supports compact parameter tables for MCU boot configuration or sensor offset storage. |
| Supply Voltage | 1.8V to 5.5V-enables direct integration across mixed-voltage systems (e.g., 3.3V MCU with 1.8V sensor interface). |
| Max Clock Frequency | 1 MHz at VCC ≥ 2.5V-delivers 16-bit read/write transfers in ≤32 µs, suitable for real-time calibration updates. |
| Write Endurance | 100,000 cycles-sufficient for field-updatable settings in industrial controllers with annual reconfiguration. |
| Data Retention | 10 years at +85°C-guarantees firmware metadata integrity over full product lifecycle in automotive under-hood modules. |
| Standby Current | 0.8 µA at VCC = 5.5V-minimizes quiescent drain in always-on battery-backed security tokens. |
| Write Time-out | 10 ms self-timed programming-eliminates need for external timing circuitry or polling overhead in host firmware. |
Pinout & Package
AK6440BH uses an 8-pin MSOP package (3.0 mm × 3.0 mm × 1.0 mm height), optimized for space-constrained PCB layouts in portable medical devices and smart meters.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: initiates instruction decode on falling edge when SK is high; releases DO to high-Z when high. |
| SK | Serial Clock | Synchronous timing reference: rising edge clocks DI data in; falling edge clocks DO data out-no clock required during write timeout. |
| DI | Data Input | Serial input for op-code (8b), address (8b), and write data (16b); sampled on SK rising edge. |
| DO | Data Output / Status | Tri-state output: delivers read data or Ready/Busy status (low = busy); high-Z otherwise-enables multi-device SPI-like sharing. |
| RESET | Write Inhibit | Hardware write lock: forces abort of ongoing WRITE if driven high during auto-erase; no effect on READ/WREN/WRDS. |
| VCC | Power Supply | Single supply input (1.8–5.5V); powers internal charge pump for write voltage generation-no external VPP needed. |
| GND | Ground Reference | Return path for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling into serial interface. |
| NC | No Connect | Unbonded pin-must remain open per datasheet; not usable as spare I/O or thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| 3-line synchronous serial interface | Direct connection to MCU UART/SPI peripherals without level shifters or protocol translation-reduces BOM count by one IC. |
| Auto-erase with write timeout | Guaranteed 10 ms max write completion time with internal erase-before-write-removes host-side timeout tuning and improves firmware determinism. |
| Dual write protection | Independent hardware (RESET pin) and software (WREN/WRDS) locks prevent accidental overwrites during power transients or firmware bugs. |
| Ready/Busy status on DO | Eliminates need for dedicated BUSY pin or polling delay loops-host reads status synchronously via same DO line used for data. |
| Ultra-low standby current | 0.8 µA at 5.5V enables >10-year battery life in coin-cell-powered asset trackers using periodic EEPROM writes. |
Applications
| Smart Sensor Calibration | Industrial PLC Configuration |
|---|---|
Use Scenario: Storing temperature-compensated offset/gain coefficients for MEMS accelerometers in handheld test equipment. IC Role / Device Role / Timing Role: Non-volatile parameter store accessed during power-up initialization and field recalibration events. Use Value: Enables factory-trimmed accuracy without external NVRAM; 100K endurance supports >50 recalibrations/year over 20-year product life. | Use Scenario: Holding user-defined I/O mapping and alarm thresholds in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Persistent configuration memory updated only during commissioning or maintenance-read frequently, written rarely. Use Value: Survives brownouts and hot-swap events due to 1.8V min operating voltage and RESET-driven write abort safety. |
| Medical Device Settings | Automotive Body Control Module |
Use Scenario: Saving patient-specific therapy parameters and usage logs in portable insulin pumps with lithium coin-cell power. IC Role / Device Role / Timing Role: Low-power data logger and setup register-retains critical settings through 10+ years of intermittent use. Use Value: 0.8 µA standby current extends 3V CR2032 battery life beyond 7 years; 10-year data retention meets FDA Class II device requirements. | Use Scenario: Storing door lock actuator calibration values and seat position memories in 12V automotive body ECUs. IC Role / Device Role / Timing Role: Robust configuration storage tolerant of load-dump transients and cold-crank voltage dips. Use Value: Wide 1.8–5.5V range operates reliably from 6V (cold crank) to 16V (load dump); -40°C to +85°C rating matches under-hood thermal profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip 24AA02E48 | 2-Kbit (128×16) capacity; I²C interface; built-in EUI-48 MAC address; no RESET pin or Ready/Busy status. | Limited to MAC-address + small config storage; lacks deterministic write timing and hardware write lock. | Select when I²C bus already exists and MAC address is required; avoid when deterministic 4-Kbit write timing or RESET-based safety is mandatory. |
| ON Semiconductor CAT24C04 | 4-Kbit (512×8) organization; I²C interface; 1 MHz max clock; no auto-erase or READY/Busy signaling. | Byte-oriented access only; requires host to manage multi-byte writes and polling; no hardware write inhibit. | Choose for legacy I²C designs needing basic 4-Kbit storage; reject when 16-bit word access, write timeout guarantee, or RESET safety are design requirements. |
Compared with 24AA02E48 and CAT24C04, the AK6440BH provides guaranteed 10 ms write completion, 16-bit word access, and hardware RESET-driven write abort-critical for safety-critical firmware update paths and deterministic real-time systems where polling or I²C arbitration delays are unacceptable.
Availability
AK6440BH is available at Aetrix Electronics and suitable for smart sensor calibration, industrial PLC configuration, and medical device settings requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for AK6440BH 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
Asahi Kasei Microdevices (AKM) is a Japanese semiconductor company specializing in analog, sensor, and mixed-signal ICs for industrial, automotive, and consumer applications.
The AK6440B series targets cost-sensitive, space-constrained embedded systems needing reliable, low-voltage serial EEPROM with deterministic write behavior and robust write protection-particularly where MCU resources are limited and safety-critical data integrity is essential.
FAQ
What is the maximum clock frequency supported by the AK6440BH at 1.8V supply?
The AK6440BH supports a maximum clock frequency of 1 MHz only at VCC ≥ 2.5V. At 1.8V, the maximum clock period is 1.5 µs (667 kHz), as specified in the AC Electrical Characteristics table on page 9 of the DAS03E-01 datasheet. This ensures reliable timing margin for write and read operations across the full voltage range.
Does the AK6440BH require an external VPP pin for write operations?
No, the AK6440BH does not require an external VPP pin. It integrates an on-chip charge pump that generates the high voltage needed for EEPROM programming from the single VCC supply (1.8V–5.5V). This eliminates the need for external high-voltage circuitry and simplifies PCB layout for the AK6440BH.
How does the RESET pin affect write operations in the AK6440BH?
The RESET pin on the AK6440BH acts as a hardware write inhibit: if driven high during a WRITE instruction or the subsequent 10 ms auto-erase period, the AK6440BH aborts internal programming and returns to Ready status. The partially written word becomes invalid, enforcing fail-safe behavior. READ, WREN, and WRDS instructions remain unaffected by RESET state.
Can the AK6440BH be used in a multi-device serial bus configuration?
Yes, the AK6440BH supports multi-device configurations via its tri-state DO pin and CS-controlled high-impedance state. When CS is high, DO enters high-Z mode, allowing multiple AK6440BH devices to share the same DO line. Each device is selected individually using its dedicated CS signal-enabling compact, scalable NVRAM expansion without bus buffers.
What is the purpose of the NC pin on the AK6440BH MSOP package?
On the AK6440BH 8-pin MSOP package, the NC (No Connect) pin is an unconnected, unbonded terminal. The datasheet explicitly states "Please Open NC pin," meaning it must remain unconnected-neither tied to VCC, GND, nor any other signal. Using it as a thermal pad or I/O would violate the device's qualified design and may impact reliability or parametric performance.
AK6440BH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Series:
- -
- Package/Case:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 256 x 16
- Memory Interface:
- SPI
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AK6440BH FAQ
1.How can I place an order for AK6440BH through Aetrix?
Please submit a Request for Quotation (RFQ) for AK6440BH 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 AK6440BH reliable?
The price and inventory of AK6440BH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AK6440BH is usually 5 days.
3.What payment methods are accepted for AK6440BH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AK6440BH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AK6440BH?
AK6440BH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AK6440BH 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 AK6440BH?
For technical support, including AK6440BH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AK6440BH requirements.
6.How does Aetrix verify that AK6440BH is sourced from the original manufacturer or authorized distributors?
All AK6440BH 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 AK6440BH meets industry standards.
7.What is the process for return or replacement of AK6440BH?
All AK6440BH units undergo pre-shipment inspection (PSI). If there is an issue with AK6440BH, 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 AK6440BH part is unused and in its original packaging.
Return procedure for AK6440BH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AK6440BH Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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