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Microchip Technology 34VL02T/ST
- Part No.:
- 34VL02T/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
34VL02T/ST.pdf
- Description:
- IC EEPROM 2KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,844
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Product details
Overview
34VL02T/ST from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with permanent and resettable software write-protection for the lower 128-byte memory block (00h–7Fh), hardware write-protect via WP pin, 1.5V to 3.6V single-supply operation, and 16-byte page write buffer. It supports up to eight cascaded devices on one bus and targets low-power embedded systems requiring nonvolatile configuration storage.
For engineers reviewing the 34VL02T/ST datasheet, 34VL02T/ST pinout, 34VL02T/ST application, or 34VL02T/ST equivalent, key selection considerations include its 100 nA standby current, Schmitt-triggered SCL/SDA inputs for noise immunity, 400 kHz max clock (100 kHz below 1.8V), 3 ms typical page write time, and dual-package availability in 6-lead SOT-23 and 8-lead surface-mount options.
Technical Context
The 34VL02T/ST implements a 2-wire I²C slave interface with addressable 256 × 8-bit memory organized as a single block. Its write protection architecture includes three independent mechanisms: hardware (WP pin), resettable software (SWP/CSWP commands), and permanent software (PSWP command), each with distinct acknowledge behavior and voltage-level dependencies (e.g., VHV detection on A0).
It features internal self-timed erase/write cycles, output slope control to suppress ground bounce, and a VCC threshold detector disabling programming below 1.35V. The device uses Schmitt-trigger inputs and input filtering (50 ns spike suppression) to ensure robust operation on noisy buses across its –20°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), organized as one contiguous block |
| Supply voltage | 1.5V to 3.6V - enables direct interfacing with 1.8V and 3.3V logic without level shifters |
| Interface | I²C-compatible 2-wire serial bus - supports standard (100 kHz) and fast (400 kHz) modes |
| Write endurance | 1 million erase/write cycles - ensures long-term reliability in frequent-update applications |
| Data retention | 200 years at +25°C - guarantees nonvolatile data integrity over product lifetime |
| Standby current | 100 nA typical - critical for battery-powered or energy-harvesting systems |
| Page write buffer | 16 bytes - reduces bus occupancy and improves firmware update efficiency |
Pinout & Package
34VL02T/ST is packaged in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA). Pin 1 is SCL; Pin 2 is VSS; Pin 3 is SDA; Pin 4 is A1; Pin 5 is A0; Pin 6 is VCC. The WP and A2 pins are not bonded out in this variant and must be left unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL | Serial Clock input | Synchronizes all I²C transactions; Schmitt-triggered for noise immunity |
| VSS | Ground reference | Return path for all internal circuitry and I/O; must be low-impedance |
| SDA | Serial Data bidirectional I/O | Open-drain output requiring external pull-up; handles address, data, and ACK |
| A1 | Chip select bit 1 | Part of 3-bit device address (A2–A0); enables up to eight devices on one bus |
| A0 | Chip select bit 0 / VHV detect | Selects device address; also used to detect high-voltage programming pulses for SWP/CSWP |
| VCC | Power supply | Accepts 1.5V–3.6V; powers internal HV generator and logic; threshold detector disables writes below 1.35V |
Key Features
| Feature | Design Value |
|---|---|
| Permanent & resettable software write-protect | Enables flexible, field-upgradable protection of lower 128-byte block (00h–7Fh) without hardware changes |
| Hardware write-protect via WP pin | Entire memory array (00h–FFh) locked when WP = VCC - provides tamper-resistant boot configuration storage |
| Low-voltage operation down to 1.5V | Supports direct integration into 1.8V microcontroller systems and extends battery life in portable devices |
| Schmitt-trigger inputs + 50 ns spike filtering | Eliminates false triggering from EMI or signal reflections on long or noisy PCB traces |
| Output slope control | Reduces ground bounce and EMI during SDA transitions - improves signal integrity in dense layouts |
Applications
| Industrial Sensor Node | Medical Wearable Device |
|---|---|
|
Use Scenario: Storing calibrated sensor offsets and user-specific thresholds in a battery-powered environmental monitor deployed in remote locations. IC Role / Device Role / Timing Role: Nonvolatile configuration storage IC retaining calibration data across power cycles and brown-out events. Use Value: 100 nA standby current extends battery life beyond 5 years; 1.5V operation ensures functionality during gradual battery discharge. |
Use Scenario: Holding patient-specific therapy parameters and usage logs in a compact, ultra-low-power glucose monitor worn continuously. IC Role / Device Role / Timing Role: Secure, write-protected parameter storage IC preventing accidental overwrite of safety-critical settings. Use Value: Permanent software write-protect (PSWP) locks initial calibration data; hardware WP pin prevents runtime corruption during firmware updates. |
| Smart Home Controller | Automotive Body Control Module |
|
Use Scenario: Saving network credentials, user preferences, and firmware update flags in a Wi-Fi-enabled thermostat operating across wide ambient temperatures. IC Role / Device Role / Timing Role: I²C-configurable EEPROM providing reliable, low-power state persistence in consumer IoT gateways. Use Value: –20°C to +85°C rating ensures stable operation in unconditioned wall cavities; 200-year data retention eliminates field replacement concerns. |
Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in a vehicle's interior control unit subject to automotive-grade thermal cycling. IC Role / Device Role / Timing Role: Automotive-qualified serial EEPROM supporting robust configuration storage under vibration and electrical noise. Use Value: Schmitt-trigger inputs and 4 kV ESD protection withstand CAN bus coupling noise; 16-byte page writes accelerate profile loading during ignition-on sequence. |
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 (Microchip) | Same 2 Kbit capacity, I²C interface, and 1.7–5.5V VCC range; lacks PSWP and VHV-based SWP; uses standard 100 kHz/400 kHz timing only | No permanent write-protect capability; requires external hardware or firmware logic to emulate PSWP behavior | Choose when full software write-protect hierarchy is unnecessary and wider voltage margin (up to 5.5V) is preferred |
| BR24G02NUX-10 (ROHM) | 2 Kbit I²C EEPROM with 1.6–5.5V operation; includes software write-protect but no permanent mode; 1 μA standby current (vs. 0.1 μA for 34VL02T/ST) | Higher standby current reduces battery life in always-on applications; no VHV-dependent command set | Choose for cost-sensitive designs where 10× higher standby current is acceptable and PSWP is not required |
Compared with AT24C02D-SSHM-T and BR24G02NUX-10, the 34VL02T/ST uniquely delivers permanent software write-protection, sub-1.8V operation down to 1.5V, and industry-leading 100 nA standby current - making it optimal for ultra-low-power, safety-critical, or field-programmable embedded systems.
Availability
34VL02T/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, smart home controllers, and automotive body control modules requiring stable component supply, long-term data retention, and robust write-protection schemes.
Supply support for 34VL02T/ST 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, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.
The 34VL02T/ST belongs to Microchip's low-voltage serial EEPROM product line, designed specifically for energy-constrained applications demanding secure, long-life nonvolatile storage with flexible, multi-layer write protection.
FAQ
What is the minimum operating voltage for the 34VL02T/ST?
The 34VL02T/ST operates down to 1.5V, enabling direct use with 1.8V microcontrollers and extending functional life in battery-powered systems undergoing voltage sag. Below 1.35V, the internal VCC threshold detector disables write operations to prevent data corruption, though read access remains possible until VCC drops below operational limits.
How does hardware write-protection work on the 34VL02T/ST?
Hardware write-protection on the 34VL02T/ST is controlled by the WP pin: when tied to VCC, the entire 256-byte memory array (00h–FFh) becomes read-only; when tied to VSS, hardware protection is disabled. This function operates independently of software write-protect states and cannot be overridden by commands or power cycling.
Can the 34VL02T/ST be used in a system with multiple I²C EEPROMs?
Yes - the 34VL02T/ST supports cascading up to eight devices on a single I²C bus using its A0, A1, and A2 address pins. Each device is selected via a unique 3-bit chip address in the I²C control byte, allowing shared SCL/SDA lines while maintaining independent memory spaces and write-protection configurations.
What is the purpose of the VHV detection on the A0 pin of the 34VL02T/ST?
VHV (high-voltage) detection on the A0 pin enables the 34VL02T/ST to recognize special software write-protect commands (SWP and CSWP). When a voltage ≥7V (for VCC <2.2V) or ≥VCC+4.8V (for VCC ≥2.2V) is applied to A0 during command transmission, the device validates and executes the protected instruction - preventing accidental activation under normal logic-level conditions.
Does the 34VL02T/ST support page writes across memory boundaries?
No - page writes on the 34VL02T/ST are constrained to physical 16-byte pages. Attempting to write across a page boundary (e.g., starting at address 0x7F) causes the address counter to wrap within the same page, overwriting previously loaded data. Application firmware must explicitly manage page alignment to avoid unintended data loss during multi-byte writes.
34VL02T/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.5V ~ 3.6V
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
34VL02T/ST FAQ
1.How can I place an order for 34VL02T/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 34VL02T/ST 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 34VL02T/ST reliable?
The price and inventory of 34VL02T/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 34VL02T/ST is usually 5 days.
3.What payment methods are accepted for 34VL02T/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34VL02T/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34VL02T/ST?
34VL02T/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34VL02T/ST 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 34VL02T/ST?
For technical support, including 34VL02T/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34VL02T/ST requirements.
6.How does Aetrix verify that 34VL02T/ST is sourced from the original manufacturer or authorized distributors?
All 34VL02T/ST 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 34VL02T/ST meets industry standards.
7.What is the process for return or replacement of 34VL02T/ST?
All 34VL02T/ST units undergo pre-shipment inspection (PSI). If there is an issue with 34VL02T/ST, 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 34VL02T/ST part is unused and in its original packaging.
Return procedure for 34VL02T/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
34VL02T/ST Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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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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