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Microchip Technology 34LC02T-E/SN
- Part No.:
- 34LC02T-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
34LC02T-E/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,264
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Product details
Overview
34LC02T-E/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with hardware and dual software write-protection, 1 MHz clock support at 2.5–5.5 V, 16-byte page write buffer, and 100 nA standby current. It operates across industrial and automotive temperature ranges (–40°C to +125°C) and is used in embedded systems for secure parameter storage, calibration data retention, and firmware configuration.
For engineers reviewing the 34LC02T-E/SN datasheet, 34LC02T-E/SN pinout, 34LC02T-E/SN application, or 34LC02T-E/SN equivalent, key selection considerations include its 1 MHz I²C speed (vs. 400 kHz for AA variants), TDFN-8 package footprint, WP pin-based full-array protection, and permanent/resetttable lower-half software write-protect capability.
Technical Context
The 34LC02T-E/SN implements a 2-wire I²C slave interface with Schmitt-trigger inputs, slope-controlled outputs, and internal address pointer for sequential reads. Its memory array is organized as 256 × 8-bit with 16-byte page boundaries, requiring software-managed wraparound avoidance during page writes.
Write protection is enforced via three independent mechanisms: external WP pin (full-array lock), resettable SWP/CSWP commands (lower 128 bytes), and non-volatile PSWP command (permanent lower-half lock). All protection states affect ACK behavior and are validated during control byte decoding with '0110' device identifier and A0 high-voltage detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), enabling compact nonvolatile storage for boot parameters or sensor offsets |
| Interface | I²C-compatible 2-wire bus, supporting standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes |
| VCC range | 2.2 V to 5.5 V - excludes sub-2.2 V operation unlike 34AA02, simplifying power rail selection |
| Write cycle time | 5 ms max (byte or page), defining minimum inter-write interval for reliable data persistence |
| Endurance | 1 million erase/write cycles - supports frequent field updates in telemetry or logging applications |
| Data retention | 200 years at 25°C - ensures long-term integrity of calibration coefficients or security keys |
| Standby current | 1 µA max (automotive temp), enabling ultra-low-power operation in battery-backed systems |
Pinout & Package
34LC02T-E/SN is packaged in an 8-lead 2×3 mm TDFN (Thin Dual Flat No-lead) with wettable flanks, optimized for space-constrained PCB layouts and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip select input / VHV detect | Part of 3-bit slave address; also senses high voltage (7–10 V) to enable SWP/CSWP commands |
| A1 | Chip select input | Part of 3-bit slave address; enables up to eight devices on one I²C bus (four for SOT-23) |
| A2 | Chip select input | Part of 3-bit slave address; logic level must match control byte bits for device selection |
| VSS | Ground reference | Return path for all internal circuits; requires low-impedance connection to minimize noise coupling |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up (2 kΩ typical for 1 MHz) and only changes during SCL low |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers; Schmitt trigger input suppresses bus noise |
| WP | Hardware write-protect | Active-high signal: tied to VCC locks entire 256-byte array regardless of software protection state |
| VCC | Power supply | 2.2–5.5 V input; internal VCC threshold detector disables writes below 1.35 V to prevent corruption |
Key Features
| Feature | Design Value |
|---|---|
| 1 MHz I²C clock support | Enables faster parameter loading vs. 400 kHz EEPROMs, reducing boot time in real-time systems |
| Dual software write-protect (SWP/PSWP) | Allows field-upgradable protection: SWP can be cleared; PSWP permanently secures critical calibration data |
| Hardware WP pin | Provides system-level lockout independent of firmware state-essential for safety-critical or tamper-resistant designs |
| 16-byte page write buffer | Reduces I²C transaction count by up to 16× per page, lowering bus occupancy and host CPU overhead |
| ESD protection >4 kV | Meets IEC 61000-4-2 Level 3 requirements, improving robustness in handling and assembly environments |
Applications
| Industrial Sensor Calibration | Automotive ECU Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor gain/offset values in programmable logic controllers or pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during power-up initialization via I²C master. Use Value: Ensures measurement accuracy across product lifetime without requiring external backup power or reprogramming. |
Use Scenario: Holding vehicle-specific configuration flags (e.g., transmission type, axle ratio) in engine control units. IC Role / Device Role / Timing Role: Secure configuration store with hardware WP enabled during vehicle assembly to prevent runtime modification. Use Value: Guarantees correct ECU behavior across production variants while supporting post-sale diagnostics via SWP-enabled updates. |
| Medical Device Settings | IoT Edge Node Identity |
|
Use Scenario: Retaining user-adjusted therapy parameters (e.g., infusion rate limits) in portable insulin pumps. IC Role / Device Role / Timing Role: Tamper-resistant settings vault with PSWP applied to lock regulatory-critical defaults. Use Value: Meets IEC 62304 safety requirements by preventing unauthorized alteration of life-sustaining parameters. |
Use Scenario: Storing unique device identifiers (e.g., MAC address, cryptographic keys) in battery-powered smart meters. IC Role / Device Role / Timing Role: Low-power identity register accessed infrequently over I²C; leverages 100 nA standby current. Use Value: Extends 10-year battery life while ensuring secure, unalterable device authentication in mesh networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 34AA02T-I/SN | Lower VCC min (1.7 V), 400 kHz max clock, same pinout and protection features | Better suited for 1.8 V microcontroller interfaces; not rated for 1 MHz timing or automotive temp | Select when operating below 2.2 V or where 1 MHz speed is unnecessary; verify VCC compatibility |
| AT24C02D-SSHM-T | Same 2 Kbit size, 1 MHz I²C, SOIC-8 package; no PSWP, only WP pin + software lock | Lacks permanent software write-protect; uses different command set and lacks VHV detection | Choose for cost-sensitive designs needing 1 MHz speed but not PSWP; requires firmware adaptation |
Compared with 34LC02T-E/SN, the 34AA02T-I/SN offers wider voltage flexibility but sacrifices speed and automotive qualification, while the AT24C02D-SSHM-T provides comparable speed and package but omits permanent software protection-making 34LC02T-E/SN uniquely suitable for safety-critical automotive and medical applications requiring irreversible data lockdown.
Availability
34LC02T-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and medical device settings requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 34LC02T-E/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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 34LC02 series is part of Microchip's serial EEPROM product line, designed specifically for reliable, low-power, and secure nonvolatile data storage in automotive, industrial, and medical applications demanding extended temperature operation and robust write protection.
FAQ
What is the maximum I²C clock frequency supported by the 34LC02T-E/SN?
The 34LC02T-E/SN supports up to 1 MHz I²C clock frequency when VCC is 2.5 V or higher. This is confirmed in the Device Selection Table and AC Specifications section of DS22029F, distinguishing it from the 34AA02 (400 kHz max) and enabling faster parameter writes in time-critical systems. The 34LC02T-E/SN does not support 1 MHz below 2.5 V.
How does hardware write protection work on the 34LC02T-E/SN?
Hardware write protection on the 34LC02T-E/SN is controlled by the WP pin: when tied to VCC, the entire 256-byte memory array is locked against all write operations-including byte, page, and software protection commands-regardless of SWP or PSWP status. When WP is tied to VSS, hardware protection is disabled and software-based protection remains active. This behavior is documented in Section 7.1 and Table 8-1.
Can the permanent software write-protect (PSWP) feature of the 34LC02T-E/SN be reversed?
No, the PSWP feature of the 34LC02T-E/SN cannot be reversed once executed. As stated in Section 7.3 and Table 7-1, PSWP permanently protects addresses 00h–7Fh and disables further acknowledgment of the '0110' device identifier. Power cycling, firmware resets, or WP pin state changes have no effect. This irreversible lock is a core design feature for securing immutable calibration or safety-critical data.
What package type is used for the 34LC02T-E/SN?
The 34LC02T-E/SN uses an 8-lead 2×3 mm TDFN (Thin Dual Flat No-lead) package with wettable flanks, as specified in the Packaging Information section (DS22029F, page 15) and confirmed by the "T" suffix in the part number and "SN" package code. This surface-mount package supports high-density PCB layouts and automated optical inspection.
Does the 34LC02T-E/SN support page write operations, and what is the buffer size?
Yes, the 34LC02T-E/SN supports page write operations with a 16-byte page buffer, as explicitly stated in the Features list and Section 4.2. This allows up to 16 bytes to be loaded into the on-chip buffer before initiating the internal 5 ms write cycle. Page writes must remain within physical page boundaries (00h–0Fh, 10h–1Fh, etc.) to avoid data wraparound, per Figure 4-2 and note on page 8.
34LC02T-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 400 ns
- Voltage - Supply:
- 2.2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
34LC02T-E/SN FAQ
1.How can I place an order for 34LC02T-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 34LC02T-E/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 34LC02T-E/SN reliable?
The price and inventory of 34LC02T-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 34LC02T-E/SN is usually 5 days.
3.What payment methods are accepted for 34LC02T-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34LC02T-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34LC02T-E/SN?
34LC02T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34LC02T-E/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 34LC02T-E/SN?
For technical support, including 34LC02T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34LC02T-E/SN requirements.
6.How does Aetrix verify that 34LC02T-E/SN is sourced from the original manufacturer or authorized distributors?
All 34LC02T-E/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 34LC02T-E/SN meets industry standards.
7.What is the process for return or replacement of 34LC02T-E/SN?
All 34LC02T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 34LC02T-E/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 34LC02T-E/SN part is unused and in its original packaging.
Return procedure for 34LC02T-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
34LC02T-E/SN Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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