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Microchip Technology 93C46AXT-E/SN
- Part No.:
- 93C46AXT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46AXT-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,273
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Product details
Overview
93C46AXT-E/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5V supply range, industrial-temperature operation (−40°C to +85°C), and 1,000,000 erase/write cycles. It provides nonvolatile storage for configuration data in embedded microcontroller systems requiring compact, reliable memory with hardware-level data protection.
For engineers reviewing the 93C46AXT-E/SN datasheet, 93C46AXT-E/SN pinout, 93C46AXT-E/SN application, or 93C46AXT-E/SN equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), SOIC-8 package, VCC ≥4.5V requirement for ERAL/WRAL operations, Ready/Busy status via DO pin, and compatibility with legacy Microwire controllers in space-constrained industrial designs.
Technical Context
The 93C46AXT-E/SN implements a synchronous serial interface with CS, CLK, and DI/DO pins, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its self-timed write cycle completes in 2 ms, and it uses power-on/off data protection circuitry to prevent corruption during brownout conditions.
Unlike C-variant devices, the 'A' version lacks an ORG pin and is permanently configured for 8-bit word access. It requires VCC ≥4.5V for ERAL and WRAL commands, and its DO pin serves dual roles: serial data output during READ and Ready/Busy status indication during programming - asserted low while busy, high when ready.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed 8-bit organization; no ORG pin; supports byte-level writes without external word alignment logic. |
| VCC operating range | 4.5 V to 5.5 V - mandates stable 5V rail; incompatible with 3.3V-only systems unless level-shifted or externally regulated. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - requires minimal GPIOs; no SPI mode or SS pin; compatible with legacy 8051 and PIC® MCU peripherals. |
| Write endurance | 1,000,000 erase/write cycles - enables frequent firmware parameter updates in field-deployed equipment without premature wear-out. |
| Data retention | 200 years at +25°C - ensures long-term reliability of calibration constants and device identity data across product lifecycle. |
| Temperature grade | Industrial (−40°C to +85°C) - validated for use in factory automation, motor drives, and industrial HMI where ambient thermal stress exceeds commercial limits. |
| Max clock frequency | 3 MHz at VCC ≥4.5V - supports fast configuration loading; timing margins allow robust operation with standard MCU GPIO toggle rates. |
Pinout & Package
93C46AXT-E/SN is supplied in an 8-lead SOIC package (SN suffix), with lead finish Pb-free Matte Tin. Pin 1 is marked by laser dot; package dimensions conform to JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICC ≤1 µA) but allows ongoing write to complete. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence without loss of state. |
| DI (Pin 3) | Data Input | Accepts Start bit, instruction opcodes, addresses, and write data; shares bus with DO only if external current-limiting resistor is used. |
| DO (Pin 4) | Data Output / Status | Outputs read data on rising CLK edge; also signals Ready/Busy: low = programming active, high = ready; enters High-Z when CS is low. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling during write cycles. |
| NC (Pin 6) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice; not usable as strap or control pin. |
| VCC (Pin 8) | Power Supply | 4.5–5.5V supply; powers internal charge pump for write/erase; voltage detect threshold is 3.8V - below which all operations are inhibited. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | 2 ms typical cycle time eliminates need for external timing control or polling delay loops in host firmware. |
| Automatic ERAL before WRAL | WRAL command internally executes full-array erase prior to write - ensures deterministic blank-state initialization without separate ERAL step. |
| Power-on/off data protection | Hardware lockout prevents writes when VCC drops below 3.8V - protects memory contents during power ramp-up/down or brownout events. |
| Erase/write enable/disable (EWEN/EWDS) | Device powers up in EWDS state; explicit EWEN required before any programming - prevents accidental overwrites during system boot or noise transients. |
| Ready/Busy status on DO | Single-pin status reporting enables efficient polling without additional GPIOs; avoids need for interrupt-driven or timer-based wait states. |
Applications
| Motor Control Configuration | Industrial Sensor Calibration |
|---|---|
Use Scenario: Storing PID tuning parameters, fault thresholds, and axis-specific compensation tables in servo drives and PLC I/O modules. IC Role / Device Role / Timing Role: Nonvolatile configuration store interfaced directly to MCU's Microwire peripheral; accessed during startup and runtime reconfiguration. Use Value: Enables field-upgradable control algorithms without firmware reflashing; retains settings across power cycles and maintenance outages. | Use Scenario: Holding sensor-specific offset/gain coefficients and linearization lookup tables in pressure, temperature, and flow transmitters. IC Role / Device Role / Timing Role: Dedicated calibration memory mapped to MCU's serial port; written once during factory trim, read on every measurement cycle. Use Value: Eliminates manual potentiometer adjustment; supports multi-point calibration traceability and automated test system integration. |
| Embedded System Identity Storage | Legacy Industrial Controller Firmware Patch |
Use Scenario: Securing unique device identifiers (MAC, serial number, manufacturing date) and security keys in networked edge devices. IC Role / Device Role / Timing Role: Tamper-resistant identity vault accessed only during secure boot and authentication handshake sequences. Use Value: Provides immutable hardware root-of-trust foundation for TLS certificate binding and firmware signature verification. | Use Scenario: Storing hotfix patches and minor feature updates for aging programmable logic controllers with fixed ROM firmware. IC Role / Device Role / Timing Role: Field-serviceable code overlay memory; loaded at boot-time by bootloader before main application execution. Use Value: Extends product service life without PCB redesign; avoids costly replacement of obsolete controller boards in installed base. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46BXT-E/SN | 16-bit organization (64 × 16); same VCC range, package, and timing; no ORG pin - fixed x16 mode. | Requires host software to manage 16-bit word addressing; unsuitable for byte-oriented protocols or legacy 8-bit register maps. | Select only if system architecture natively supports 16-bit data paths and memory mapping aligns with 64-word structure. |
| 93LC46AXT-I/SN | Wider VCC range (2.5–5.5V); same 8-bit organization and SOIC-8 package; identical pinout and instruction set. | Operates down to 2.5V - enables direct interface with 3.3V MCUs without level shifters; rated for same industrial temp range. | Preferred for new 3.3V designs; backward-compatible drop-in replacement where VCC stability ≥2.5V is guaranteed. |
Compared with 93C46AXT-E/SN, the 93C46BXT-E/SN offers higher data density per instruction but demands 16-bit host support, while the 93LC46AXT-I/SN provides broader voltage flexibility at no cost to pin compatibility or software effort - making it ideal for mixed-voltage industrial systems.
Availability
93C46AXT-E/SN is available at Aetrix Electronics and suitable for industrial motor control, sensor calibration, embedded identity management, and legacy controller patching requiring stable component supply across extended production lifecycles.
Supply support for 93C46AXT-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 93Cxx series was designed specifically for cost-sensitive, space-constrained industrial and automotive applications requiring robust, low-pin-count serial EEPROM with hardware data integrity safeguards and wide temperature operation.
FAQ
What is the memory organization of the 93C46AXT-E/SN?
The 93C46AXT-E/SN has a fixed 128 × 8-bit (1Kbit) organization. As an 'A'-suffix device, it does not include an ORG pin and is permanently configured for 8-bit word access. This eliminates external configuration logic and simplifies interface design for byte-addressable applications such as parameter storage and calibration data.
Does the 93C46AXT-E/SN require an external pull-up resistor on the DO pin?
No, the 93C46AXT-E/SN does not require an external pull-up on DO. The DO pin actively drives high or low during READ and Ready/Busy status reporting, and enters High-Z when CS is low. However, if DI and DO are wired together (shared bus), a current-limiting resistor is mandatory to prevent bus conflict during the dummy zero phase of READ operations.
Can the 93C46AXT-E/SN operate from a 3.3V supply?
No, the 93C46AXT-E/SN requires a minimum VCC of 4.5V and is specified only for 4.5–5.5V operation. Attempting to power it from 3.3V will inhibit all programming functions due to its 3.8V VCC detect threshold. For 3.3V systems, consider the functionally identical 93LC46AXT-I/SN, which supports 2.5–5.5V operation.
How is data protection implemented in the 93C46AXT-E/SN?
Data protection in the 93C46AXT-E/SN is implemented through three hardware mechanisms: (1) power-on/off detection that disables all write operations below 3.8V VCC, (2) Erase/Write Disable (EWDS) default power-up state requiring explicit EWEN before programming, and (3) automatic inhibition of ERAL and WRAL unless VCC ≥4.5V - preventing partial erases during unstable supply conditions.
What is the maximum clock frequency supported by the 93C46AXT-E/SN?
The 93C46AXT-E/SN supports a maximum clock frequency of 3 MHz when VCC is between 4.5V and 5.5V. At this rate, the minimum clock high and low times are 200 ns and 100 ns respectively. Timing margins remain valid across the full industrial temperature range, enabling reliable communication with standard MCU GPIO toggle speeds.
93C46AXT-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:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C46AXT-E/SN FAQ
1.How can I place an order for 93C46AXT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46AXT-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 93C46AXT-E/SN reliable?
The price and inventory of 93C46AXT-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 93C46AXT-E/SN is usually 5 days.
3.What payment methods are accepted for 93C46AXT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46AXT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46AXT-E/SN?
93C46AXT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46AXT-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 93C46AXT-E/SN?
For technical support, including 93C46AXT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46AXT-E/SN requirements.
6.How does Aetrix verify that 93C46AXT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C46AXT-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 93C46AXT-E/SN meets industry standards.
7.What is the process for return or replacement of 93C46AXT-E/SN?
All 93C46AXT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46AXT-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 93C46AXT-E/SN part is unused and in its original packaging.
Return procedure for 93C46AXT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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