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Microchip Technology AT24C08C-CUM-T
- Part No.:
- AT24C08C-CUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFBGA
- Datasheet:
-
AT24C08C-CUM-T.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8VFBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT24C08C-CUM-T from Microchip Technology is an 8-Kbit (1,024 × 8) I²C-compatible serial EEPROM in an 8-pad UDFN package, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support at ≥2.5V, and hardware write protection via WP pin - used for nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT24C08C-CUM-T datasheet, AT24C08C-CUM-T pinout, AT24C08C-CUM-T application, or AT24C08C-CUM-T equivalent, key selection considerations include I²C bus voltage compatibility (1.7–5.5V), page-write timing (≤5 ms), standby current (≤6 μA), and UDFN-8 footprint constraints in space-constrained PCB layouts.
Technical Context
The AT24C08C-CUM-T implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) speeds depending on VCC level. Its memory is organized as 64 pages of 16 bytes each, enabling partial-page writes and sequential reads without address wraparound.
It features internal pull-downs on A1 (NC), A2 (device address), and WP pins - with A1 unconnected per device identity and A2 enabling up to two devices on one bus. Write protection is hardware-controlled: WP = VCC locks full array, WP = GND enables writes, and floating defaults to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8,192 bits (1,024 × 8), organized as 64 pages × 16 bytes - supports efficient firmware parameter storage with page-level write granularity. |
| Supply Voltage | 1.7V to 5.5V - interoperable with 1.8V, 3.3V, and 5V microcontrollers without level-shifting. |
| I²C Speed Modes | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz (2.5–5.5V) - enables high-throughput configuration updates in fast-boot systems. |
| Write Cycle Time | ≤5 ms maximum - ensures deterministic timeout handling in real-time host firmware. |
| Standby Current | ≤6 μA at 5.5V - critical for battery-backed systems requiring multi-year data retention with minimal quiescent drain. |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C - validated for industrial field-upgrade and calibration logging use cases. |
| ESD Protection | >4,000V HBM - provides robustness against handling and board-level ESD events in manufacturing and field service. |
Pinout & Package
AT24C08C-CUM-T is packaged in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) with exposed pad, measuring 2.0 mm × 1.6 mm × 0.55 mm (max). The exposed pad may be connected to GND or left floating per layout requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded die pad; must be left unconnected - not usable as address or control pin. |
| 2 (A2) | Device Address Input | Hardwired to GND/VCC to set I²C slave address bit A2; enables up to two AT24C08C devices on same bus. |
| 3 (GND) | Ground Reference | Primary return path for VCC and I/O; recommended to connect exposed pad to GND for thermal and EMI performance. |
| 4 (VCC) | Power Supply | 1.7–5.5V supply input; requires local 100 nF ceramic decoupling within 3 mm of pin. |
| 5 (WP) | Write-Protect Control | Hardware lock: tied to VCC → full-array write inhibit; tied to GND → normal writes; floating defaults to GND. |
| 6 (SCL) | Serial Clock Input | Open-drain compatible; requires external pull-up (≤10 kΩ); clock edges control data latching (rising) and output (falling). |
| 7 (SDA) | Serial Data I/O | Bidirectional open-drain line; shared across I²C bus; requires external pull-up; supports ACK/NACK handshaking. |
| 8 (NC) | No Connect | Unbonded; no internal connection - must remain unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 16-byte Page Write Mode | Enables partial-page writes without erasing adjacent bytes - reduces wear and improves update efficiency in dynamic config tables. |
| Schmitt Trigger + Noise Filtering | Suppresses bus glitches and EMI-induced false starts/stops - eliminates spurious ACK/NACK errors in noisy industrial environments. |
| Power-on Reset (POR) Circuit | Guarantees device remains in reset until VCC stabilizes ≥1.5V and tPUP (100 µs) elapses - prevents corrupted writes during brown-out recovery. |
| Low-Voltage Operation | Full functionality down to 1.7V - supports direct interfacing with ultra-low-power MCUs (e.g., PIC16LF, MSP430FR) without regulators. |
| Green Packaging | RoHS-compliant, halide-free, lead-free UDFN-8 - meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for standard assembly. |
Applications
| Smart Energy Meters | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Storing tariff schedules, meter calibration coefficients, and tamper-event logs across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via I²C during boot and runtime by ARM Cortex-M7 host MCU. Use Value: 100-year data retention and 1M write endurance ensure accuracy over 20+ year field deployment without recalibration. |
Use Scenario: Holding module identification, channel scaling factors, and firmware revision metadata in modular I/O backplanes. IC Role / Device Role / Timing Role: System-level parameter store synchronized with hot-swap detection and FPGA configuration handshake. Use Value: ≤5 ms write cycle enables atomic updates during module insertion without disrupting real-time I/O scanning. |
| Medical Infusion Pumps | Automotive Body Control Modules |
|
Use Scenario: Securing drug library profiles, dose limits, and user audit trails compliant with IEC 62304 Class C software requirements. IC Role / Device Role / Timing Role: Safety-critical configuration vault isolated via dedicated WP pin tied to system security controller. Use Value: Hardware write-protection prevents unauthorized modification of therapeutic parameters during operation. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles linked to vehicle VIN and user ID. IC Role / Device Role / Timing Role: Personalization data repository accessed over automotive-grade I²C bus (ISO 11898-3 compliant transceivers). Use Value: 1.7V operation supports direct connection to 1.8V domain MCUs, eliminating level-shifters and reducing BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24C08-RMN6TP | Same 8-Kbit size, SOIC-8 package, 1.7–5.5V, but only supports up to 400 kHz I²C (no FM+); no internal A2 pull-down. | Lacks 1 MHz mode and UDFN footprint - suitable for legacy board refreshes where speed and size are secondary. | Select when SOIC-8 rework is preferred and 1 MHz throughput is unnecessary. |
| ON Semiconductor CAT24C08HU4I-GT3 | 8-Kbit, UDFN-8, 1.7–5.5V, supports 1 MHz FM+, but WP pin is active-high (inverted logic) and lacks internal A2 pull-down. | Requires inverted WP control logic and external A2 biasing - increases design complexity for drop-in replacement. | Choose only if existing firmware already handles active-high WP and discrete A2 pull-up. |
Compared with AT24C08C-CUM-T, M24C08-RMN6TP trades speed and package miniaturization for SOIC-8 compatibility, while CAT24C08HU4I-GT3 matches UDFN-8 and FM+ but introduces WP polarity and address pin biasing mismatches that require schematic and firmware changes.
Availability
AT24C08C-CUM-T is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical infusion pumps, automotive personalization systems, and IoT edge node designs requiring stable component supply across long product lifecycles.
Supply support for AT24C08C-CUM-T 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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and broad automotive/industrial qualification coverage.
The AT24C08C belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile storage in space- and energy-constrained embedded systems.
FAQ
What is the function of the NC pins on the AT24C08C-CUM-T UDFN package?
The AT24C08C-CUM-T has two NC (No Connect) pins - Pin 1 and Pin 8 - which are physically present but internally unbonded and electrically isolated. These pins must remain unconnected on the PCB; routing traces or applying solder paste to them risks shorting or mechanical stress. Their presence accommodates die pad layout symmetry and package tooling consistency across the AT24CxxC family, but they serve no electrical purpose in the AT24C08C-CUM-T.
Does the AT24C08C-CUM-T support 1 MHz I²C communication at 1.8V?
No, the AT24C08C-CUM-T does not support 1 MHz (Fast Mode Plus) operation at 1.8V. Per its datasheet, FM+ mode requires VCC ≥2.5V. At 1.8V, the device operates only in Standard (100 kHz) or Fast (400 kHz) modes. Attempting 1 MHz signaling below 2.5V violates AC timing specifications and may result in missed ACKs, data corruption, or bus lockup - confirmed by Table 4-3 AC Characteristics and Section 4.2 DC/AC Operating Range.
How many AT24C08C-CUM-T devices can share the same I²C bus?
Up to two AT24C08C-CUM-T devices can share a single I²C bus. This is determined by the hardwired A2 pin: each device uses a unique A2 state (GND or VCC) to generate distinct 7-bit slave addresses (1010000b or 1010001b). Unlike the AT24C04C, the AT24C08C lacks the A1 pin, limiting address combinations to two. Floating A2 is discouraged due to noise susceptibility, and both devices must use identical VCC and pull-up resistor values for reliable arbitration.
What is the maximum capacitive load the AT24C08C-CUM-T SDA/SCL lines can drive?
The AT24C08C-CUM-T specifies a maximum bus capacitance of 400 pF for reliable I²C operation across all supported modes. This limit derives from timing constraints (e.g., tR/tF ≤300 ns) and open-drain drive strength. With typical UDFN-8 pin capacitance of ≤8 pF (SDA) and ≤6 pF (SCL), the remaining budget (≈386 pF) accommodates PCB trace capacitance (~1–3 pF/mm) and up to ~5–8 additional devices, assuming proper pull-up sizing (e.g., 2.2 kΩ at 3.3V for 400 kHz). Exceeding 400 pF risks setup/hold violations.
Is the exposed pad on the AT24C08C-CUM-T UDFN package required to be grounded?
No, the exposed pad on the AT24C08C-CUM-T UDFN package is optional to ground. According to Microchip's DS20006127B-page 4 and page 5, it may be connected to GND for improved thermal dissipation and EMI suppression, or left floating with no functional impact. If grounded, it must be soldered to a thermal pad with ≥4 vias to internal GND planes; if floating, it must be fully isolated from all copper layers to prevent unintended coupling or shorts.
AT24C08C-CUM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFBGA (1.5x2)
AT24C08C-CUM-T FAQ
1.How can I place an order for AT24C08C-CUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C08C-CUM-T 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 AT24C08C-CUM-T reliable?
The price and inventory of AT24C08C-CUM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C08C-CUM-T is usually 5 days.
3.What payment methods are accepted for AT24C08C-CUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C08C-CUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C08C-CUM-T?
AT24C08C-CUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C08C-CUM-T 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 AT24C08C-CUM-T?
For technical support, including AT24C08C-CUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C08C-CUM-T requirements.
6.How does Aetrix verify that AT24C08C-CUM-T is sourced from the original manufacturer or authorized distributors?
All AT24C08C-CUM-T 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 AT24C08C-CUM-T meets industry standards.
7.What is the process for return or replacement of AT24C08C-CUM-T?
All AT24C08C-CUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C08C-CUM-T, 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 AT24C08C-CUM-T part is unused and in its original packaging.
Return procedure for AT24C08C-CUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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