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Microchip Technology 24AA16H-I/ST
- Part No.:
- 24AA16H-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24AA16H-I/ST.pdf
- Description:
- IC EEPROM 16KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:725
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Product details
Overview
24AA16H-I/ST from Microchip Technology Inc. is a 16-Kbit I²C-compatible serial EEPROM organized as eight 256 × 8-bit blocks, operating from 1.7V to 5.5V with 400 kHz max clock frequency (100 kHz below 2.5V), 1 μA standby current, and hardware write-protect for the upper half-array (400h–7FFh). It is used in embedded systems for storing calibration data, configuration settings, and firmware parameters.
For engineers reviewing the 24AA16H-I/ST datasheet, 24AA16H-I/ST pinout, 24AA16H-I/ST application, or 24AA16H-I/ST equivalent, key selection criteria include low-voltage operation down to 1.7V, industrial temperature range (−40°C to +85°C), SOIC-8 package compatibility, half-array write-protection, and I²C timing compliance at 400 kHz.
Technical Context
The 24AA16H-I/ST functions as an I²C slave device with fixed 4-bit control code '1010' and 3-bit block-select addressing, supporting byte and 16-byte page writes. Its internal Address Pointer auto-increments during sequential reads and random-access operations.
It implements Schmitt-trigger inputs and output slope control to suppress noise and eliminate ground bounce on shared I²C buses. Write cycles are self-timed (max 5 ms), and ACK polling enables bus-efficient status checking without fixed delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit (2048 × 8), organized as eight 256-word blocks for flexible block-level access |
| VCC Range | 1.7V–5.5V - enables direct interface with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| Max Clock Frequency | 400 kHz (≥2.5V); 100 kHz (1.7V–2.49V) - ensures reliable timing across wide supply range |
| Write Protection | Hardware-enabled half-array protection (400h–7FFh) via WP pin tied to VCC - prevents accidental overwrite of critical firmware or calibration data |
| Endurance & Retention | 1 million erase/write cycles and >200 years data retention - suitable for long-life industrial deployments |
| Operating Temperature | −40°C to +85°C (Industrial grade) - validated for use in automotive ECUs, industrial sensors, and medical devices |
| I²C Interface | Standard-mode and fast-mode compatible with 100 kHz / 400 kHz - interoperable with legacy and modern host controllers |
Pinout & Package
24AA16H-I/ST is supplied in an 8-lead SOIC (SN) package per Microchip drawing C04-057-SN, with standard 1.27 mm pitch, 3.90 mm body width, and JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Ground reference | Common return path for all internal circuitry; must be connected to system GND |
| WP | Write-protect input | Logic-high disables writes to upper 8 Kbit (400h–7FFh); logic-low enables full-memory access |
| SCL | Serial clock input | Master-generated clock synchronizing all I²C transactions; requires external pull-up |
| SDA | Serial data I/O | Bidirectional open-drain line for address/data transfer; requires external pull-up (2 kΩ typical at 400 kHz) |
| VCC | Power supply | Primary power rail (1.7V–5.5V); decoupling capacitor (0.1 μF) recommended near pin |
| A0, A1, A2 | No-connect | Internally unconnected; may be left floating or tied to VSS/VCC with no functional impact |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.7V - supports battery-powered and energy-harvesting systems |
| Page write buffer | 16-byte buffer enables efficient bulk writes without repeated start/stop overhead |
| Noise-immune I/O | Schmitt-trigger inputs and spike suppression (≤50 ns) ensure robustness on electrically noisy PCBs |
| Self-timed write cycle | 5 ms maximum duration with automatic internal timing - eliminates need for host wait states |
| ESD protection | Exceeds 4 kV HBM - enhances reliability during handling and in-field operation |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients and tariff tables that persist across power cycles and firmware updates. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed via I²C during boot and field update sequences. Use Value: Hardware write-protect (WP = VCC) prevents corruption of calibrated values during routine firmware upgrades or brownout events. | Use Scenario: Holding user-defined I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Slave EEPROM providing persistent configuration storage accessible by ARM Cortex-M host MCU over I²C. Use Value: 1.7V operation allows direct connection to 1.8V I/O domains; 1 million endurance supports decades of field reconfiguration. |
| Automotive Body Control Module | Medical Diagnostic Device Settings |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and diagnostic fault logs in AEC-Q100 qualified systems. IC Role / Device Role / Timing Role: Automotive-grade serial EEPROM interfacing with CAN-connected microcontroller via isolated I²C bus. Use Value: Industrial temperature rating (−40°C to +85°C) and AEC-Q100 qualification ensure reliability under hood thermal cycling. | Use Scenario: Retaining user-selected measurement units, calibration offsets, and audit trail timestamps in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory for regulatory-compliant data logging and configuration persistence. Use Value: >200-year data retention meets FDA 21 CFR Part 11 requirements for long-term clinical record integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC16BH-I/ST | Requires minimum 2.5V VCC; same 400 kHz speed and SOIC-8 package | Not suitable for 1.8V systems; otherwise identical functionality and pinout | Select only if system VCC ≥2.5V and 24AA16H-I/ST's 1.7V capability is unnecessary |
| AT24C16C-SSHM-T | 16-Kbit I²C EEPROM from Microchip (Atmel lineage); 1.7V–5.5V, 1 MHz max clock, SOIC-8 | Higher speed (1 MHz) but lacks half-array write-protect; different address scheme (no block-select bits) | Prefer when faster write throughput is needed and hardware write-protect is not required |
Compared with 24LC16BH-I/ST, the 24AA16H-I/ST enables lower-voltage operation and retains identical pinout and software compatibility; compared with AT24C16C-SSHM-T, it offers deterministic half-array protection at the cost of reduced maximum clock rate.
Availability
24AA16H-I/ST is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, automotive body control modules, and medical diagnostic devices requiring stable component supply across extended product lifecycles.
Supply support for 24AA16H-I/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, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with high-reliability silicon and development tools.
The 24AA16H belongs to Microchip's 24XX16H family of I²C serial EEPROMs, designed specifically for low-power, space-constrained embedded systems requiring robust nonvolatile storage with hardware security features.
FAQ
What is the maximum I²C clock frequency supported by the 24AA16H-I/ST?
The 24AA16H-I/ST supports up to 400 kHz when VCC is 2.5V or higher; at 1.7V–2.49V, the maximum clock frequency is 100 kHz. This dual-speed capability ensures reliable operation across wide supply ranges without external clock dividers or protocol adaptation.
How does the write-protect feature work on the 24AA16H-I/ST?
When the WP pin of the 24AA16H-I/ST is tied to VCC, writes to memory addresses 400h–7FFh (upper 8 Kbit) are inhibited while reads remain fully functional. Tying WP to VSS enables full read/write access. No software configuration is required - protection is purely hardware-based and active immediately after power-up.
Can the 24AA16H-I/ST be used in 1.8V systems?
Yes, the 24AA16H-I/ST is fully specified for operation from 1.7V to 5.5V, making it directly compatible with 1.8V logic domains. Its I²C interface meets timing requirements at 100 kHz in this range, and its 1 μA standby current minimizes battery drain in portable 1.8V applications.
What is the purpose of the A0, A1, and A2 pins on the 24AA16H-I/ST?
The A0, A1, and A2 pins on the 24AA16H-I/ST are not internally connected and serve no functional purpose. They may be left floating or tied to VSS or VCC without affecting device operation - a design choice enabling pin compatibility across Microchip's broader 24XX16H family despite differing addressing schemes.
Does the 24AA16H-I/ST require external pull-up resistors on SDA and SCL lines?
Yes, the 24AA16H-I/ST requires external pull-up resistors on both SDA and SCL lines because it uses open-drain outputs. For 400 kHz operation, a 2 kΩ resistor to VCC is recommended; for 100 kHz, 10 kΩ is typical. Proper pull-up strength ensures signal rise time compliance per I²C specification.
24AA16H-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24AA16H-I/ST FAQ
1.How can I place an order for 24AA16H-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA16H-I/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 24AA16H-I/ST reliable?
The price and inventory of 24AA16H-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24AA16H-I/ST is usually 5 days.
3.What payment methods are accepted for 24AA16H-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA16H-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA16H-I/ST?
24AA16H-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA16H-I/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 24AA16H-I/ST?
For technical support, including 24AA16H-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA16H-I/ST requirements.
6.How does Aetrix verify that 24AA16H-I/ST is sourced from the original manufacturer or authorized distributors?
All 24AA16H-I/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 24AA16H-I/ST meets industry standards.
7.What is the process for return or replacement of 24AA16H-I/ST?
All 24AA16H-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24AA16H-I/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 24AA16H-I/ST part is unused and in its original packaging.
Return procedure for 24AA16H-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24AA16H-I/ST Tags
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AT21CS01-STUM10-T
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