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Microchip Technology AT24C16B-PU
- Part No.:
- AT24C16B-PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C16B-PU.pdf
- Description:
- IC EEPROM 16KBIT I2C 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,213
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Product details
Overview
AT24C16B-PU from Microchip Technology (formerly Atmel) is a 16-kbit two-wire serial EEPROM IC used for nonvolatile data storage in embedded control, power management, and configuration memory applications. It features 2048 × 8-bit organization, 1.8V to 5.5V operation, 1 MHz I²C interface at 5V, hardware write protection via WP pin, and 1 million write cycles endurance.
For engineers reviewing the AT24C16B-PU datasheet, AT24C16B-PU pinout, AT24C16B-PU application, or AT24C16B-PU equivalent, this page delivers verified electrical specs, package mapping to 8-lead PDIP, validated I²C timing at 1.8V/5V, real-world endurance and retention metrics, and confirmed drop-in alternatives for industrial temperature (−40°C to +85°C) designs.
Technical Context
The AT24C16B-PU implements a standard two-wire (I²C-compatible) serial interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its internal address counter supports current-address, random-address, and sequential read modes, and it uses an 11-bit word address for full 2048-word addressing.
Write operations include byte-write and 16-byte page-write modes with self-timed 5 ms max write cycle; acknowledge polling enables host synchronization. The WP pin provides hardware-level write protection - tied to VCC to lock the full 16K array, or GND for normal R/W access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 kbit (2048 × 8-bit), enabling storage of firmware calibration tables or device configuration parameters without external address latches. |
| Interface | Two-wire I²C-compatible bus with 1 MHz max clock (5V), 400 kHz (1.8V); requires only two MCU GPIOs and pull-up resistors. |
| Supply Voltage | 1.8V to 5.5V operation allows direct interfacing with 1.8V logic, 3.3V microcontrollers, and 5V legacy systems without level shifters. |
| Endurance | 1,000,000 write cycles ensures reliable logging in high-update-rate applications like energy metering or sensor calibration counters. |
| Data Retention | 100 years at 25°C guarantees long-term integrity of stored settings across product lifecycles, including unpowered storage. |
| Operating Temp | −40°C to +85°C industrial range supports deployment in automotive body controllers, industrial PLCs, and outdoor IoT nodes. |
| Write Protection | Dedicated WP pin enables hardware-enforced read-only mode when pulled high, preventing accidental overwrites during firmware updates. |
Pinout & Package
AT24C16B-PU is supplied in an 8-lead PDIP (Plastic Dual Inline Package), 0.300" wide body, lead-free/halogen-free, with pin 1 identified by a dot. This through-hole package supports manual prototyping, socket-based testing, and legacy PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.8–5.5V; powers internal charge pump and logic; decoupling capacitor required near pin for noise suppression. |
| WP | Hardware write protect control | Pulled high to VCC to disable all writes to entire 16K array; pulled low to GND for full read/write capability. |
| SCL | Serial clock input | Positive-edge sampled clock; Schmitt-triggered input rejects noise; requires external pull-up resistor to VCC. |
| SDA | Serial bidirectional data line | Open-drain output/input; shared across multiple I²C devices; requires external pull-up resistor to VCC. |
| NC | No-connect terminal | Internally unconnected; must remain floating or grounded per layout guidelines - no external connection permitted. |
| GND | Ground reference | System ground return path; must be low-impedance and routed separately from noisy digital grounds. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.8V supply enables integration into battery-powered or ultra-low-power systems without voltage translation. |
| 16-byte page write | Reduces I²C transaction overhead by up to 16× versus byte-write; accelerates bulk configuration writes (e.g., parameter sets). |
| Schmitt-trigger inputs | Suppresses noise on SCL/SDA lines in electrically noisy environments (e.g., motor drives, power supplies), improving bus reliability. |
| Self-timed write cycle | Eliminates need for host MCU to manage write timing; host can poll ACK or use fixed 5 ms delay before next command. |
| Lead-free/halogen-free | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles, supporting automated lead-free assembly. |
Applications
| Industrial Sensor Calibration | Printer Configuration Storage |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding 2048 bytes of trim values, accessed at power-on reset via I²C. Use Value: Enables field-replaceable sensor modules with persistent calibration; eliminates need for external programming fixtures. |
Use Scenario: Retaining paper-type, resolution, and color-profile settings across printer power cycles and firmware updates. IC Role / Device Role / Timing Role: I²C slave EEPROM storing user-customized print engine parameters, updated only during menu changes. Use Value: Guarantees consistent output quality without requiring reconfiguration after each reboot or firmware patch. |
| Smart Energy Metering | Medical Device Setup Memory |
|
Use Scenario: Logging tariff schedules, demand-response thresholds, and tamper-event timestamps in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: High-endurance data logger using page-write mode to record time-stamped events with minimal bus contention. Use Value: Supports >10 years of daily logging at 1000 writes/year while maintaining 100-year data retention under grid cabinet temperatures. |
Use Scenario: Preserving clinician-configured alarm limits, patient ID templates, and calibration history in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure configuration store with WP pin hardwired to VCC during operation to prevent runtime corruption. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring critical setup data cannot be overwritten unintentionally. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC16B-I/P | Same 16K capacity, I²C interface, and PDIP-8 package; rated for −40°C to +85°C but specifies 400 kHz max speed at 1.8V (vs. AT24C16B-PU's 1 MHz at 5V). | Lower maximum clock frequency limits throughput in high-speed host systems; identical pinout and voltage range support direct substitution where speed margin exists. | Select when cost sensitivity outweighs need for 1 MHz operation; verify timing margins in 5V systems. |
| CAT24C16WI-GT3 | 16K I²C EEPROM in PDIP-8; supports 1 MHz at 2.5–5.5V but not guaranteed below 2.5V (AT24C16B-PU operates down to 1.8V). | Not suitable for 1.8V-only systems; otherwise matches endurance (1M cycles), retention (100 yr), and WP functionality. | Choose for 3.3V/5V-only designs where Microchip sourcing constraints exist; confirm 1.8V compatibility is unnecessary. |
Compared with 24LC16B-I/P and CAT24C16WI-GT3, the AT24C16B-PU uniquely supports full 1 MHz I²C operation across its entire 1.8–5.5V range and guarantees 1.8V functionality - making it the only option for mixed-voltage or battery-depleted scenarios requiring fast configuration reads.
Availability
AT24C16B-PU is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy metering, and medical device setup memory requiring stable component supply across extended product lifecycles.
Supply support for AT24C16B-PU 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 acquired Atmel in 2016 and now manufactures and supports the AT24C16B-PU as part of its broad serial EEPROM portfolio, emphasizing reliability and long-term availability for industrial applications.
The AT24C16B-PU belongs to Microchip's legacy AT24Cxx family of I²C EEPROMs, designed specifically for robust, low-power, nonvolatile data storage in space-constrained and thermally demanding embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the AT24C16B-PU?
The AT24C16B-PU supports up to 1 MHz I²C clock frequency when VCC = 5.0V, and 400 kHz when VCC = 1.8V. These values are specified in Table 4-3 of the official datasheet (5175E–SEEPR–3/09) and reflect guaranteed AC timing performance across the industrial temperature range (−40°C to +85°C). The AT24C16B-PU does not support 1 MHz operation at 1.8V.
Does the AT24C16B-PU require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C16B-PU requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL input is internally passive. Typical values range from 1.3 kΩ (for 2.5V/5.0V systems) to 10 kΩ (for 1.8V systems), as defined in Note 2 of Table 4-3 in the AT24C16B-PU datasheet.
How many write cycles can the AT24C16B-PU endure before failure?
The AT24C16B-PU is rated for 1,000,000 write cycles per memory location at 25°C under page-mode conditions at 3.3V, as specified in Table 4-3 of the datasheet. This endurance rating applies to the entire 2048-word array and is validated per JEDEC standards, ensuring reliability in high-update-rate logging applications.
Is the AT24C16B-PU compatible with 1.8V microcontrollers?
Yes, the AT24C16B-PU is fully compatible with 1.8V microcontrollers: it operates from 1.8V to 5.5V, supports 400 kHz I²C communication at 1.8V, and meets VIH/VIL thresholds for 1.8V logic levels. Its Schmitt-triggered inputs further enhance noise immunity in mixed-voltage board environments.
What does the "-PU" suffix indicate in AT24C16B-PU?
The "-PU" suffix in AT24C16B-PU denotes the 8-lead PDIP (Plastic Dual Inline Package) variant supplied in bulk form only, as confirmed in the Ordering Information section of the AT24C16B datasheet (page 13). It is lead-free/halogen-free and rated for industrial temperature (−40°C to +85°C).
AT24C16B-PU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C16B-PU FAQ
1.How can I place an order for AT24C16B-PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C16B-PU 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 AT24C16B-PU reliable?
The price and inventory of AT24C16B-PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C16B-PU is usually 5 days.
3.What payment methods are accepted for AT24C16B-PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C16B-PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C16B-PU?
AT24C16B-PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C16B-PU 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 AT24C16B-PU?
For technical support, including AT24C16B-PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C16B-PU requirements.
6.How does Aetrix verify that AT24C16B-PU is sourced from the original manufacturer or authorized distributors?
All AT24C16B-PU 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 AT24C16B-PU meets industry standards.
7.What is the process for return or replacement of AT24C16B-PU?
All AT24C16B-PU units undergo pre-shipment inspection (PSI). If there is an issue with AT24C16B-PU, 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 AT24C16B-PU part is unused and in its original packaging.
Return procedure for AT24C16B-PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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