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Microchip Technology 93LC46AT-I/SN
- Part No.:
- 93LC46AT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46AT-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,400
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Product details
Overview
93LC46AT-I/SN from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and SOIC-8 package. It features self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status signaling via DO pin - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46AT-I/SN datasheet, 93LC46AT-I/SN pinout, 93LC46AT-I/SN application, or 93LC46AT-I/SN equivalent, key selection criteria include voltage compatibility (2.5–5.5 V), 8-bit x128 organization (no ORG pin), industrial temp grade, SOIC-8 footprint, and Microwire protocol timing compliance at up to 2 MHz (VCC ≥ 2.5 V).
Technical Context
The 93LC46AT-I/SN implements a synchronous 3-wire Microwire interface using CS, CLK, and DI/DO lines. It operates exclusively in 8-bit mode ('A' variant), eliminating ORG pin dependency and simplifying host interface logic. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit followed by opcode and address/data bits clocked on CLK rising edges.
Internal power-on reset and voltage detect circuitry (VPOR = 1.5 V typical) ensure data protection during brown-out conditions. The device powers up in EWDS (Erase/Write Disable) state, requiring explicit EWEN before programming, and supports sequential read, high-Z DO during standby, and polling-based Ready/Busy status via DO pin after TCSL ≥ 250 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin required. |
| Supply Voltage | 2.5 V to 5.5 V - supports wide-range industrial MCU I/O rails; VPOR = 1.5 V prevents corruption during power ramp. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - requires no additional level-shifting for 3.3 V or 5 V hosts. |
| Max Clock Frequency | 2 MHz at VCC ≥ 2.5 V - defines maximum instruction throughput; timing validated per Table 1-2 A1/A2/A3. |
| Write Cycle Time | 6 ms typical (TWC) - self-timed auto-erase-and-write; no external delay needed in firmware. |
| Endurance & Retention | 1,000,000 erase/write cycles; >200 years data retention - suitable for infrequent but critical parameter storage. |
| Temperature Range | –40°C to +85°C (Industrial grade) - qualified for extended operation in industrial control and automotive body electronics. |
Pinout & Package
93LC46AT-I/SN is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, Pb-free matte tin finish, standard JEDEC MS-012AC footprint (body width 3.9 mm, lead pitch 1.27 mm). Pin 1 marked by notch or laser dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions (TCSL); initiates self-timed write on falling edge. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence. |
| DI (Pin 3) | Data Input | Receives Start bit, opcodes, addresses, and write data; shares net with DO only with series resistor to avoid bus conflict. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or during standby. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be low-impedance connection. |
| NC (Pin 6) | No Connect | Internally unconnected; must be left floating or tied to VSS (not driven). |
| VCC (Pin 8) | Power Supply | 2.5–5.5 V supply; includes on-chip voltage detect (VPOR) for power-fail protection. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or firmware delays - cycle completes autonomously in ≤6 ms. |
| Automatic ERAL Before WRAL | WRAL instruction internally executes full-array erase prior to write - guarantees consistent blanking without separate ERAL command. |
| Power-On/Off Data Protection | Hardware VPOR circuitry blocks writes when VCC < 1.5 V - prevents corruption during power-up/down transitions. |
| Erase/Write Enable/Disable (EWEN/EWDS) | Explicit EWEN required before any programming; EWDS restores protection - prevents accidental overwrites in field operation. |
| Ready/Busy Polling via DO | DO pin signals status during erase/write - enables non-blocking host operation without fixed timeout loops. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in HVAC controllers or pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding calibration constants accessed at boot by host MCU. Use Value: 1M endurance ensures reliable updates across product lifetime; 2.5 V min VCC supports battery-backed or energy-harvesting designs. | Use Scenario: Saving user preferences (e.g., cooking time, temperature presets) in microwave ovens or washing machines. IC Role / Device Role / Timing Role: Serial parameter storage interfaced directly to 8-bit MCU GPIOs via Microwire. Use Value: SOIC-8 footprint allows easy PCB layout; self-timed write avoids MCU resource contention during save operations. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Retaining seat/mirror position memory and lighting configuration in vehicle BCMs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM storing persistent settings accessible via low-pin-count MCU interface. Use Value: Qualified I-temp rating and 1.5 V VPOR ensure robustness against automotive battery transients and cold-cranking conditions. | Use Scenario: Storing calibration data and usage logs in portable ultrasound or glucose meters with strict reliability requirements. IC Role / Device Role / Timing Role: Trusted nonvolatile memory for safety-critical parameters, accessed during power-up self-test. Use Value: >200-year data retention meets long-term medical device archival needs; RoHS-compliant Pb-free finish satisfies regulatory mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-I/SN | 16-bit (64 × 16) organization; same VCC, temp, package - requires host software rework for word-width alignment. | Used where 16-bit MCU data paths dominate and memory density efficiency is prioritized over byte-level access. | Select only if system architecture mandates native 16-bit reads/writes and firmware can accommodate address/data width changes. |
| AT25010B-SSHL-T | 1 Kbit SPI interface (4-wire), 1.8–5.5 V, SOIC-8; lacks ERAL/WRAL and EWEN/EWDS security features. | Preferred in SPI-native designs where protocol simplicity outweighs advanced erase/write control. | Choose when migrating from Microwire to SPI infrastructure; verify absence of ERAL/WRAL does not impact field update workflow. |
Compared with 93LC46B-I/SN, the 93LC46AT-I/SN offers simpler 8-bit addressing and eliminates ORG pin routing complexity; versus AT25010B-SSHL-T, it provides hardware-enforced write protection and atomic array-wide operations critical for fail-safe configuration management.
Availability
93LC46AT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC46AT-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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona.
The 93LC46A/B/C family was designed specifically for cost-sensitive, low-power embedded systems requiring reliable serial nonvolatile storage with minimal pin count and robust data integrity features.
FAQ
What is the memory organization of the 93LC46AT-I/SN?
The 93LC46AT-I/SN is an 'A'-variant device with fixed 128 × 8-bit (1 Kbit) organization. It does not include an ORG pin and operates exclusively in x8 mode - unlike 'C' variants which require external logic to select x8/x16 configuration. This simplifies PCB layout and firmware design for byte-oriented applications.
Does the 93LC46AT-I/SN support automatic erase before write?
Yes, the 93LC46AT-I/SN performs self-timed auto-erase before each WRITE or WRAL operation. The TWC parameter specifies 6 ms typical cycle time, covering both erase and program phases. No separate ERASE command is needed before WRITE, and no external timing control is required - the device handles the entire sequence autonomously.
How is write protection implemented on the 93LC46AT-I/SN?
Write protection on the 93LC46AT-I/SN is enforced through dual mechanisms: hardware voltage detection (VPOR = 1.5 V) blocks writes during low-VCC conditions, and the Erase/Write Enable/Disable (EWEN/EWDS) protocol requires explicit EWEN before any programming. The device powers up in EWDS state, preventing accidental writes until enabled by host firmware.
What is the maximum clock frequency supported by the 93LC46AT-I/SN?
The 93LC46AT-I/SN supports up to 2 MHz clock frequency when VCC is ≥2.5 V, as specified in Table 1-2 (A1). At lower voltages (1.8–2.5 V), max frequency drops to 1 MHz - but this range does not apply to the 93LC46AT-I/SN since its minimum VCC is 2.5 V. Timing margins are validated for TCKH ≥250 ns and TCKL ≥200 ns.
Can the 93LC46AT-I/SN be used in automotive applications?
The 93LC46AT-I/SN is rated for Industrial temperature (–40°C to +85°C), not Automotive (–40°C to +125°C). While it may function in some under-hood environments, Microchip specifies the 'E' grade (e.g., 93LC46AT-E/SN) for full automotive qualification. For AEC-Q100 compliance or extended high-temp operation, the E-temp variant must be selected instead of the I-temp 93LC46AT-I/SN.
93LC46AT-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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC46AT-I/SN FAQ
1.How can I place an order for 93LC46AT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AT-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 93LC46AT-I/SN reliable?
The price and inventory of 93LC46AT-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 93LC46AT-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC46AT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AT-I/SN?
93LC46AT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AT-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 93LC46AT-I/SN?
For technical support, including 93LC46AT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AT-I/SN requirements.
6.How does Aetrix verify that 93LC46AT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46AT-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 93LC46AT-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC46AT-I/SN?
All 93LC46AT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AT-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 93LC46AT-I/SN part is unused and in its original packaging.
Return procedure for 93LC46AT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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