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Microchip Technology 34LC02T-I/SN
- Part No.:
- 34LC02T-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
34LC02T-I/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,236
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Product details
Overview
34LC02T-I/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 temperature (−40°C to +85°C) in 8-lead SOIC package and is used for secure parameter storage in embedded controllers and sensor calibration modules.
For engineers reviewing the 34LC02T-I/SN datasheet, 34LC02T-I/SN pinout, 34LC02T-I/SN application, or 34LC02T-I/SN equivalent, key selection criteria include write-protection flexibility (hardware WP pin + resettable/permament SWP), low-voltage operation down to 2.2 V, I²C timing compliance up to 1 MHz, and endurance exceeding 1 million cycles with >200-year data retention.
Technical Context
The 34LC02T-I/SN implements a 2-wire I²C slave interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its memory array is organized as 256 × 8-bit with internal address pointer enabling current-address, random, and sequential read modes.
Write protection is implemented via three independent mechanisms: external WP pin (entire array), resettable Software Write-Protect (SWP) command (lower 128 bytes), and non-volatile Permanent Software Write-Protect (PSWP) command (lower 128 bytes). Acknowledge polling supports bus efficiency during self-timed 5 ms write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), sufficient for firmware flags, calibration coefficients, or device ID storage |
| VCC range | 2.2 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V microcontrollers without level shifting |
| Max I²C clock | 1 MHz - doubles throughput vs. standard 400 kHz EEPROMs for high-frequency configuration updates |
| Page write buffer | 16 bytes - reduces I²C transaction count by up to 16× compared to byte-write operations |
| Endurance | 1 million erase/write cycles - supports daily reconfiguration over 27 years in field-deployed systems |
| Data retention | >200 years at 85°C - ensures long-term reliability in unattended industrial monitoring applications |
| Standby current | 100 nA typical - minimizes battery drain in always-on IoT edge nodes and portable instrumentation |
Pinout & Package
34LC02T-I/SN is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip select input / VHV detection | Part of 3-bit slave address (A2–A0); also senses high-voltage pulse (7–10 V) for SWP/CSWP command execution |
| A1 | Chip select input | Part of 3-bit slave address; enables cascading up to eight devices on same I²C bus |
| A2 | Chip select input | Part of 3-bit slave address; unused in SOT-23 variant but functional in SOIC |
| VSS | Ground reference | Return path for all internal logic and I/O; must be low-impedance connection to minimize noise coupling |
| SDA | Open-drain bidirectional data line | Requires external pull-up resistor (2 kΩ for 1 MHz); supports I²C ACK/NACK signaling and data transfer |
| SCL | Input clock line | Master-generated clock synchronizing all I²C transactions; Schmitt-trigger input rejects bus noise |
| WP | Hardware write-protect enable | Active-high signal: tied to VCC disables all writes to entire memory array regardless of software state |
| VCC | Power supply | Supplies core logic and EEPROM array; brown-out detection disables writes below 1.35 V nominal |
Key Features
| Feature | Design Value |
|---|---|
| Dual software write-protection | Resettable SWP and permanent PSWP commands protect lower 128 bytes (00h–7Fh), enabling flexible security partitioning |
| Hardware write-protect pin | WP pin provides unconditional, pin-level lockout of full 256-byte array-immune to firmware corruption or voltage glitch |
| I²C timing compliance | Meets 1 MHz AC specs at 2.5–5.5 V with THIGH/TLOW ≤500 ns, TR/TF ≤300 ns, supporting high-speed system bootloading |
| Noise-immune interface | Schmitt-trigger inputs + 50 ns spike suppression filter ensure robust operation on electrically noisy industrial PCBs |
| Self-timed write cycle | Internal 5 ms erase/write completion eliminates need for fixed delay; ACK polling enables optimal bus utilization |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients and linearization tables for analog sensor front-ends. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during power loss or reset events. Use Value: Enables one-time calibration at manufacturing and field recalibration without risk of accidental overwrite due to dual SWP/PSWP and WP pin. |
Use Scenario: Holding user-configurable therapy parameters, safety limits, and audit logs in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration memory with >200-year data retention for regulatory compliance. Use Value: Hardware WP pin prevents runtime modification of critical safety thresholds; PSWP locks immutable calibration constants. |
| Automotive Body Control Module | Smart Meter Firmware Flags |
|
Use Scenario: Recording seat position memory, mirror presets, and lighting profiles in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Low-power I²C EEPROM interfaced directly to 3.3 V MCU with extended temperature support (−40°C to +85°C). Use Value: 100 nA standby current extends battery life during vehicle sleep mode; 1 MHz clock accelerates profile loading at ignition. |
Use Scenario: Storing firmware update status, tariff schedules, and cryptographic keys in utility smart meters. IC Role / Device Role / Timing Role: Trusted configuration store with permanent write-lock capability for regulatory-mandated parameters. Use Value: PSWP command permanently protects meter certification data against unauthorized firmware rollback or cloning attacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02D-SSHM-T | 2 Kbit I²C EEPROM, 1.7–5.5 V, 400 kHz max clock, no PSWP, only hardware WP | Lacks permanent software write-protection; suitable where firmware-based locking is unnecessary | Select when cost sensitivity outweighs need for PSWP; requires external logic for multi-level protection |
| M95020-WMN6TP | 2 Kbit SPI EEPROM, 1.8–5.5 V, 20 MHz SPI clock, hardware WP only, no software protection | Uses SPI interface instead of I²C; incompatible bus protocol and pinout | Choose only if system already uses SPI peripherals and board layout cannot accommodate I²C routing |
Compared with AT24C02D-SSHM-T and M95020-WMN6TP, the 34LC02T-I/SN uniquely delivers triple-layer write protection (WP pin + SWP + PSWP) within an I²C interface, enabling secure, field-upgradable parameter storage without protocol conversion or external logic.
Availability
34LC02T-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart meter firmware flag storage requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 34LC02T-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 for embedded control applications.
The 34LC02T-I/SN belongs to Microchip's serial EEPROM product line, designed specifically for secure, low-power, I²C-based nonvolatile storage in space-constrained industrial and automotive systems.
FAQ
What is the maximum I²C clock frequency supported by the 34LC02T-I/SN?
The 34LC02T-I/SN supports up to 1 MHz I²C clock frequency when operating within its specified VCC range of 2.5 V to 5.5 V. At lower voltages (1.7–2.5 V), it defaults to 400 kHz or 100 kHz per datasheet Table 1-2. This high-speed capability enables faster configuration writes compared to legacy 400 kHz EEPROMs, reducing system initialization time in the 34LC02T-I/SN.
How does hardware write-protection work on the 34LC02T-I/SN?
Hardware write-protection on the 34LC02T-I/SN is controlled by the WP pin: when tied to VCC, all write operations-including byte, page, and software protection commands-are blocked across the full 256-byte memory array. When WP is tied to VSS, hardware protection is disabled and software-based protections (SWP/PSWP) govern access. This physical lock ensures immunity to firmware errors or voltage transients in the 34LC02T-I/SN.
Can the 34LC02T-I/SN be used with a 1.8 V microcontroller I²C interface?
No-the 34LC02T-I/SN requires a minimum VCC of 2.2 V and is not rated for 1.8 V operation. While its I²C pins tolerate input levels down to 0.3 VCC, the internal EEPROM array and logic do not function reliably below 2.2 V. For 1.8 V systems, consider the 34AA02 variant (1.7–5.5 V) instead of the 34LC02T-I/SN.
What is the purpose of the A0 pin beyond chip addressing in the 34LC02T-I/SN?
In addition to serving as the least-significant chip address bit (A0), the A0 pin on the 34LC02T-I/SN detects a high-voltage pulse (7–10 V) required to execute Software Write-Protect (SWP) and Clear Software Write-Protect (CSWP) commands. This HV detection mechanism prevents accidental activation of protection features during normal 2.2–5.5 V operation of the 34LC02T-I/SN.
How many devices can be cascaded on a single I²C bus using the 34LC02T-I/SN?
Up to eight 34LC02T-I/SN devices can be cascaded on a single I²C bus using the A2, A1, and A0 pins to generate unique 3-bit slave addresses. Each device must have a distinct combination of logic levels on these pins. The 34LC02T-I/SN does not support address extension beyond eight units-unlike some competitors offering 4-bit addressing.
34LC02T-I/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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
34LC02T-I/SN FAQ
1.How can I place an order for 34LC02T-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 34LC02T-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 34LC02T-I/SN reliable?
The price and inventory of 34LC02T-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 34LC02T-I/SN is usually 5 days.
3.What payment methods are accepted for 34LC02T-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34LC02T-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34LC02T-I/SN?
34LC02T-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34LC02T-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 34LC02T-I/SN?
For technical support, including 34LC02T-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34LC02T-I/SN requirements.
6.How does Aetrix verify that 34LC02T-I/SN is sourced from the original manufacturer or authorized distributors?
All 34LC02T-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 34LC02T-I/SN meets industry standards.
7.What is the process for return or replacement of 34LC02T-I/SN?
All 34LC02T-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 34LC02T-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 34LC02T-I/SN part is unused and in its original packaging.
Return procedure for 34LC02T-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
34LC02T-I/SN Tags
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AT24C02C-XHM-T
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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