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Microchip Technology 34AA02-I/SN
- Part No.:
- 34AA02-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
34AA02-I/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,235
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Product details
Overview
34AA02-I/SN from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with software and hardware write protection, operating from 1.7V to 5.5V, supporting up to 400 kHz clock frequency at industrial temperature (−40°C to +85°C), featuring 16-byte page write buffer and >1 million erase/write cycles - used for secure parameter storage in embedded control systems.
For engineers reviewing the 34AA02-I/SN datasheet, 34AA02-I/SN pinout, 34AA02-I/SN application, or 34AA02-I/SN equivalent, key selection criteria include low-voltage operation down to 1.7V, dual software write-protect modes (resettable and permanent), hardware WP pin for full-array protection, Schmitt-trigger inputs for noise immunity, and compatibility with standard I²C bus timing at 400 kHz.
Technical Context
The 34AA02-I/SN implements a 256 × 8-bit memory array organized as a single block, accessed via a bidirectional 2-wire I²C interface where it operates exclusively as a slave device. Its internal address pointer supports current-address, random, and sequential read modes, while write operations are constrained by physical 16-byte page boundaries.
Write protection is implemented through three independent mechanisms: hardware (WP pin tied to VCC), resettable software (SWP/CSWP commands), and permanent software (PSWP command). All require specific voltage conditions on A0 (VHV detection) and matching chip-select bits (A2–A0) during command issuance, with acknowledgment behavior varying per protection state per Table 7-2 and 7-3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), sufficient for firmware calibration data, device IDs, or configuration registers |
| Supply voltage range | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V logic domains without level shifters |
| I²C clock frequency | Up to 400 kHz (at VCC ≥ 1.8V) - supports high-throughput parameter updates in real-time systems |
| Page write buffer | 16 bytes - reduces bus transactions for multi-byte writes and improves system-level write efficiency |
| Endurance | 1 million erase/write cycles - ensures long-term reliability in field-updatable applications |
| Data retention | 200 years at 25°C - guarantees nonvolatile storage integrity over product lifetime without refresh |
| Standby current | 100 nA typical - minimizes power draw in battery-backed or energy-harvesting systems |
Pinout & Package
34AA02-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150 mil body width, RoHS-compliant matte tin plating, and industrial temperature rating (−40°C to +85°C). Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip select input / VHV detection | Used for device addressing (A0–A2) and high-voltage detection during SWP/CSWP commands (VHV = 7–10 V) |
| A1 | Chip select input | Part of 3-bit slave address; enables cascading up to eight devices on same I²C bus |
| A2 | Chip select input | Third bit of slave address; must match corresponding bits in control byte for device response |
| VSS | Ground reference | Return path for all internal circuitry; requires low-impedance connection to system ground plane |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up resistor (2–10 kΩ); carries address, data, and ACK/NACK |
| SCL | Serial clock input | Master-generated clock synchronizing all I²C transfers; Schmitt-trigger input suppresses noise |
| WP | Hardware write-protect enable | Active-high signal: tied to VCC to lock entire 256-byte array; tied to VSS to disable hardware protection |
| VCC | Power supply | Single 1.7–5.5V supply powering EEPROM core, interface logic, and HV generator for write cycles |
Key Features
| Feature | Design Value |
|---|---|
| Permanent and resettable software write-protect | Enables flexible security policy: lower 128 bytes (00h–7Fh) can be locked permanently (PSWP) or conditionally (SWP/CSWP) without hardware changes |
| Schmitt-trigger inputs on SCL/SDA | Provides 0.05×VCC hysteresis and 50 ns spike suppression - eliminates false triggering on noisy industrial buses |
| Output slope control | Reduces ground bounce and EMI during SDA transitions - critical for stable operation in mixed-signal PCB layouts |
| Self-timed erase/write cycle | Removes need for external timing control; internal 5 ms max write cycle allows deterministic firmware delay handling |
| ESD protection >4,000 V | Meets HBM Class 3A requirements - protects against handling damage during assembly and field service |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing factory-calibrated sensor offsets and gain coefficients in programmable sensors deployed in HVAC or process control systems. IC Role / Device Role / Timing Role: Nonvolatile parameter storage element interfaced via I²C during sensor initialization or field recalibration. Use Value: Enables traceable, tamper-resistant calibration data retention across power cycles and device replacements without reprogramming. |
Use Scenario: Holding user-configurable therapy parameters (e.g., dose limits, alarm thresholds) in portable infusion pumps certified to IEC 62304. IC Role / Device Role / Timing Role: Secure configuration register with hardware and software write-locking to prevent accidental or unauthorized parameter modification. Use Value: Supports regulatory compliance by ensuring immutable safety-critical settings remain intact after power loss or firmware update. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Recording seat position memory, mirror presets, and lighting profiles in automotive BCMs operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Low-power EEPROM for persistent user preference storage, accessed only during ignition-on or wake-up events. Use Value: Achieves <100 nA standby current and 200-year data retention - meets OEM requirements for 15+ year vehicle service life. |
Use Scenario: Storing tariff schedules, billing history, and meter firmware version logs in ANSI C12.20-compliant smart meters. IC Role / Device Role / Timing Role: Tamper-evident memory for audit-trail data, protected by permanent software write-lock (PSWP) on critical fields. Use Value: Prevents unauthorized alteration of utility billing records while enabling field-upgradable tariff tables via resettable SWP zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02C-SSHM-T (Microchip) | Same 2 Kbit capacity, 1.7–5.5V, but supports 1 MHz I²C; lacks PSWP feature and uses different write-protection scheme | Higher-speed bus use cases where permanent software lock is unnecessary; not drop-in due to different WP command protocol | Select when maximum throughput is prioritized over permanent write-lock capability |
| ST24C02-WDT6-TR (STMicroelectronics) | 2 Kbit, 1.8–5.5V, 400 kHz I²C; includes write-protect register but no permanent software lock; different pinout (WP on pin 7 vs. 34AA02-I/SN pin 7) | Cost-sensitive industrial designs where full-array hardware WP suffices and ST's qualification profile is preferred | Choose for ST-qualified supply chains; verify layout compatibility due to differing WP pin assignment |
Compared with AT24C02C-SSHM-T and ST24C02-WDT6-TR, the 34AA02-I/SN uniquely provides permanent software write-protection (PSWP) for critical configuration blocks - a design advantage in safety- or security-critical applications where irreversible data locking is mandated.
Availability
34AA02-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 34AA02-I/SN 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 manufacturer specializing in microcontrollers, analog devices, and memory products, with a focus on embedded control and connectivity solutions.
The 34AA02-I/SN belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, and secure nonvolatile data storage in resource-constrained embedded systems operating across industrial and automotive environments.
FAQ
What is the maximum I²C clock frequency supported by the 34AA02-I/SN?
The 34AA02-I/SN supports up to 400 kHz I²C clock frequency when VCC is ≥1.8V. At VCC <1.8V, the maximum clock rate drops to 100 kHz per DS22029F-page 4, Table 1-2. This dual-speed capability ensures interoperability with both legacy and modern I²C masters across wide voltage operating ranges.
Does the 34AA02-I/SN support permanent write protection of memory contents?
Yes, the 34AA02-I/SN supports permanent software write-protection (PSWP) of the lower 128 bytes (addresses 00h–7Fh) via a dedicated command that cannot be reversed by power cycling, firmware reset, or WP pin state. Once executed, the device no longer acknowledges the PSWP instruction, confirming irreversible lock status.
How many devices can be connected on the same I²C bus using the 34AA02-I/SN?
Up to eight 34AA02-I/SN devices can be connected on a single I²C bus using unique combinations of A2, A1, and A0 address pins. Each device responds only when its A2–A0 levels match the corresponding bits in the master's control byte, enabling scalable memory expansion without additional address decoding logic.
What is the purpose of the VHV detection on the A0 pin of the 34AA02-I/SN?
The A0 pin on the 34AA02-I/SN serves dual roles: chip select input and high-voltage detection (VHV) for software write-protection commands. During SWP or CSWP execution, VHV (7–10 V) must be applied to A0 to validate the command - preventing accidental activation under normal logic-level conditions and enhancing command security.
Is the 34AA02-I/SN compatible with standard I²C protocol specifications?
Yes, the 34AA02-I/SN is fully I²C-compatible, supporting standard START/STOP conditions, 7-bit slave addressing, ACK/NACK handshaking, and bidirectional data transfer. It adheres to I²C timing requirements including THD:STA, TSU:DAT, and TAA across its specified voltage and temperature ranges, as verified in Tables 1-2 and Figure 3-1 of DS22029F.
34AA02-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 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-SOIC
34AA02-I/SN FAQ
1.How can I place an order for 34AA02-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 34AA02-I/SN 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 34AA02-I/SN reliable?
The price and inventory of 34AA02-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 34AA02-I/SN is usually 5 days.
3.What payment methods are accepted for 34AA02-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34AA02-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34AA02-I/SN?
34AA02-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34AA02-I/SN 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 34AA02-I/SN?
For technical support, including 34AA02-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34AA02-I/SN requirements.
6.How does Aetrix verify that 34AA02-I/SN is sourced from the original manufacturer or authorized distributors?
All 34AA02-I/SN 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 34AA02-I/SN meets industry standards.
7.What is the process for return or replacement of 34AA02-I/SN?
All 34AA02-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 34AA02-I/SN, 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 34AA02-I/SN part is unused and in its original packaging.
Return procedure for 34AA02-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
34AA02-I/SN 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
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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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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