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Microchip Technology 24C65T/SM
- Part No.:
- 24C65T/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
24C65T/SM.pdf
- Description:
- IC EEPROM 64KBIT I2C 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:4,793
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Product details
Overview
24C65T/SM from Microchip Technology Inc. is a 64 Kbit (8K × 8) I²C-compatible serial EEPROM with programmable high-endurance memory blocks, operating from 4.5V to 6.0V, featuring 64-byte input cache, 5 ms/page write cycle time, and Schmitt-triggered noise-immune SDA/SCL inputs for industrial-temperature (–40°C to +85°C) embedded data logging and configuration storage.
For engineers reviewing the 24C65T/SM datasheet, 24C65T/SM pinout, 24C65T/SM application, or 24C65T/SM equivalent, key selection criteria include its dual endurance rating (10M cycles for 4K-bit high-endurance block vs. 1M for remainder), 400 kHz Fast Mode I²C support at VCC ≥ 4.5V, programmable security for up to 15 × 4K blocks, and SOIJ-8 surface-mount package compatibility with legacy 24Cxx footprints.
Technical Context
The 24C65T/SM implements a two-wire I²C slave interface with hardware-addressable device select pins (A0–A2), supporting up to eight devices on one bus. Its internal architecture includes a 64-byte FIFO page cache, dual-voltage-programmable endurance blocks, and configurable write-protection via dedicated configuration byte sequences.
It uses advanced CMOS process with integrated VDD monitor, power-on/off data protection, and slope-controlled outputs to suppress ground bounce. The device supports three read modes (current address, random, sequential) and two write modes (byte and page), with acknowledge polling for write-cycle completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 6.0V - Enables direct integration into 5V systems without level-shifting; excludes 1.8–4.4V operation supported by 24AA65/24LC65 variants. |
| Memory Density | 64 Kbit (8K × 8) - Provides sufficient nonvolatile storage for firmware parameters, calibration data, or device IDs in resource-constrained microcontroller systems. |
| I²C Speed | Up to 400 kHz Fast Mode - Delivers 4× throughput over Standard Mode (100 kHz), reducing EEPROM access latency in time-critical host communication. |
| Write Cycle Time | 5 ms per page (8 bytes) - Fixed timing enables deterministic firmware delay handling; partial-page writes still consume full 5 ms. |
| Endurance | 10,000,000 cycles (4K-bit high-endurance block); 1,000,000 cycles (remaining 60K bits) - Allows frequent updates to critical counters or logs while preserving long-term reliability of static configuration data. |
| Data Retention | > 200 years - Guarantees data integrity across product lifecycles in industrial and automotive applications without periodic refresh. |
| ESD Protection | > 4000V HBM - Ensures robustness against handling and board-level ESD events in manufacturing and field environments. |
Pinout & Package
24C65T/SM is housed in an 8-pin SOIJ (Small Outline Integrated Circuit, J-bend) surface-mount package, compatible with standard SOIC-8 PCB footprints and reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1, A2 | Device Address Inputs | User-configurable hardware address bits enabling up to eight 24C65T/SM devices on a single I²C bus; tied to VSS or VCC to set unique 3-bit slave address. |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O; must be low-impedance and decoupled near the package. |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up resistor (2 kΩ typical for 400 kHz); carries address, command, and data; supports noise filtering and Schmitt triggering. |
| SCL | Serial Clock Input | Master-generated clock signal synchronizing all I²C transactions; features Schmitt trigger and input filtering for reliable edge detection in noisy environments. |
| VCC | Power Supply | 4.5–6.0V supply input with internal voltage monitoring to prevent write operations during brown-out conditions. |
| NC | No Internal Connection | Unbonded pin; must remain unconnected on PCB to avoid unintended coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte input cache | Enables burst loading of up to 64 bytes at I²C bus speed before initiating internal write, improving effective write throughput and reducing host CPU overhead. |
| Programmable high-endurance block | One user-selectable 4K-bit region rated for 10M erase/write cycles, ideal for frequently updated telemetry or counter values without compromising array-wide reliability. |
| Configurable security blocks | Allows permanent write-protection of up to 15 contiguous 4K-bit regions (e.g., bootloader code or calibration constants) after a single programming command. |
| Schmitt-trigger + filtered I/O | Eliminates false Start/Stop detection and improves immunity to EMI-induced glitches on SDA/SCL lines, especially critical in motor-driven or switching-power environments. |
| Self-timed write cycles | Removes need for host-controlled timing delays; write completion signaled via ACK polling, enabling efficient bus arbitration and multi-device coordination. |
Applications
| Industrial Sensor Node | Smart Meter Configuration |
|---|---|
Use Scenario: Storing calibrated sensor offsets, linearization coefficients, and runtime fault logs in battery-powered environmental monitors deployed in factory settings. IC Role / Device Role / Timing Role: Nonvolatile parameter store interfaced via I²C to an ultra-low-power MCU; retains data across power cycles and supports infrequent but critical write operations. Use Value: The 10M-cycle high-endurance block ensures 10+ years of daily calibration updates without wear-out; 200-year data retention eliminates field recalibration requirements. |
Use Scenario: Holding tariff tables, billing registers, tamper-detection flags, and cryptographic keys in utility meters operating across wide temperature ranges. IC Role / Device Role / Timing Role: Secure configuration and event-logging memory with programmable write protection; accessed during meter boot and periodic data uploads. Use Value: Configurable 4K-block security prevents unauthorized modification of billing logic; industrial-temp rating (–40°C to +85°C) guarantees operation in outdoor meter enclosures. |
| Automotive Body Control Module | Medical Device Calibration Storage |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and diagnostic trouble codes in 12V automotive ECUs exposed to engine-bay thermal cycling. IC Role / Device Role / Timing Role: Robust I²C EEPROM interfaced to an automotive-grade MCU; withstands load-dump transients and operates reliably at 125°C ambient (E-temp grade variant). Use Value: 4.5–6.0V VCC range aligns with regulated 5V rail in automotive domains; >4 kV ESD rating protects against assembly and service-handling events. |
Use Scenario: Storing factory-calibrated ADC gain/offset values, patient-specific therapy parameters, and audit-trail timestamps in portable diagnostic equipment. IC Role / Device Role / Timing Role: Certified-reliable nonvolatile memory for safety-critical calibration data; accessed during power-up and clinical setup routines. Use Value: 200-year data retention meets ISO 13485 long-term record-keeping mandates; RoHS-compliant Pb-free SOIJ-8 package supports medical-grade assembly standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC65T/SM | Wider VCC range (2.5–6.0V); supports 100 kHz only below 4.5V; same pinout, package, and memory map. | Preferred for mixed-voltage systems (e.g., 3.3V MCU + 5V peripherals) where 24C65T/SM's 4.5–6.0V limit is restrictive. | Select when design requires operation below 4.5V or needs guaranteed 100 kHz I²C timing across full temperature range. |
| AT24C64D-SSHM-T | Same 64 Kbit density and SOIC-8 package; 1.7–5.5V VCC; no high-endurance block or programmable security; 1M-cycle endurance across entire array. | Suitable for cost-sensitive, non-critical storage where advanced features like endurance partitioning or block locking are unnecessary. | Choose for simpler designs lacking frequent-write or security requirements; lower unit cost but no endurance or security configurability. |
Compared with 24LC65T/SM, the 24C65T/SM offers higher-speed I²C (400 kHz) at 5V but sacrifices sub-4.5V operation; versus AT24C64D-SSHM-T, it delivers differentiated endurance and security at higher complexity and cost-making it optimal for industrial and automotive applications demanding long-term reliability and data integrity.
Availability
24C65T/SM is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter configuration, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 24C65T/SM 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 solutions for embedded control applications.
The 24C65T/SM belongs to Microchip's "Smart Serial EEPROM" product line, designed specifically for systems needing programmable endurance, configurable security, and robust I²C communication in harsh industrial and automotive environments.
FAQ
What is the maximum I²C clock frequency supported by the 24C65T/SM?
The 24C65T/SM supports up to 400 kHz Fast Mode I²C operation, but only when VCC is between 4.5V and 6.0V. Below 4.5V, it defaults to Standard Mode (100 kHz). This voltage-gated speed behavior is inherent to the 24C65T/SM silicon design and documented in the DS21073K datasheet AC characteristics table.
Does the 24C65T/SM have built-in write protection, and how is it configured?
Yes, the 24C65T/SM includes programmable write protection for up to 15 contiguous 4K-bit blocks. Protection is enabled via a one-time configuration sequence using specific bit patterns in the address bytes-starting block number and count are written using a dedicated command format. Once set, the security cannot be altered, ensuring permanent integrity of protected regions in the 24C65T/SM.
Can the 24C65T/SM operate at temperatures beyond –40°C to +85°C?
No-the 24C65T/SM is specified for Industrial temperature range (–40°C to +85°C). While the broader 24XX65 family includes Automotive-grade variants (24C65-E/SM, –40°C to +125°C), the 24C65T/SM part number explicitly denotes the Industrial version. Operation outside its rated range may result in parametric failure or reduced reliability of the 24C65T/SM.
How does the 64-byte input cache improve write performance in the 24C65T/SM?
The 64-byte input cache allows the 24C65T/SM to accept up to 64 bytes of data at full I²C bus speed before initiating any internal write cycle. This decouples host transmission time from EEPROM programming latency, enabling burst transfers and reducing total transaction time-especially beneficial when writing multiple parameters in sequence within a single 24C65T/SM page or across adjacent pages.
Is the 24C65T/SM pin-compatible with other 24Cxx EEPROMs like the 24C02 or 24C64?
Yes-the 24C65T/SM uses the standard 8-pin SOIJ package with identical pinout (A0–A2, VSS, SDA, SCL, VCC, NC) as legacy 24Cxx devices including 24C02, 24C64, and 24C128. However, software must account for its larger 64 Kbit address space (13-bit addressing), different page size (8 bytes), and extended command set for high-endurance and security features not present in earlier 24Cxx parts.
24C65T/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 4.5V ~ 6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIJ
24C65T/SM FAQ
1.How can I place an order for 24C65T/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 24C65T/SM 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 24C65T/SM reliable?
The price and inventory of 24C65T/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24C65T/SM is usually 5 days.
3.What payment methods are accepted for 24C65T/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24C65T/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24C65T/SM?
24C65T/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24C65T/SM 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 24C65T/SM?
For technical support, including 24C65T/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24C65T/SM requirements.
6.How does Aetrix verify that 24C65T/SM is sourced from the original manufacturer or authorized distributors?
All 24C65T/SM 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 24C65T/SM meets industry standards.
7.What is the process for return or replacement of 24C65T/SM?
All 24C65T/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24C65T/SM, 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 24C65T/SM part is unused and in its original packaging.
Return procedure for 24C65T/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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