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Microchip Technology 93C46AX-E/SN
- Part No.:
- 93C46AX-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46AX-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
93C46AX-E/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used for configuration storage in automotive control modules.
For engineers reviewing the 93C46AX-E/SN datasheet, 93C46AX-E/SN pinout, 93C46AX-E/SN application, or 93C46AX-E/SN equivalent, key selection criteria include VCC operating range (4.5–5.5 V), 8-bit fixed organization (no ORG pin), automotive-grade temperature rating, SOIC-8 packaging, and Microwire protocol timing compliance.
Technical Context
The 93C46AX-E/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins - no ORG pin (fixed 8-bit x128 organization). It uses internal auto-erase-before-write logic and supports ERAL (Erase All) and WRAL (Write All) commands requiring ≥4.5 V VCC.
Its operation relies on Start-bit detection (CS high + DI high on CLK rising edge), clock-synchronous data transfer (rising-edge sampling), and DO pin dual-role functionality: serial data output during READ and Ready/Busy status polling during programming - with status valid after minimum TCSL (250 ns) and TSV (200–500 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin; no word-size reconfiguration. |
| VCC range | 4.5 V to 5.5 V - requires ≥4.5 V for ERAL/WRAL execution; POR threshold at 3.8 V. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI or I²C compatibility. |
| Write endurance | 1,000,000 erase/write cycles - specified at 25°C, VCC = 5.0 V; not tested but characterized. |
| Data retention | Greater than 200 years - guaranteed under rated temperature and voltage conditions. |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified per AEC-Q100 stress test requirements. |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - limits maximum READ/WRITE throughput to ~167 kbit/s (18 CLK cycles per 8-bit READ). |
Pinout & Package
93C46AX-E/SN is supplied in an 8-lead SOIC package (SN suffix), Pb-free Matte Tin finish, with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = NC (no internal connection), Pin 7 = NC, Pin 8 = VCC. ORG pin is absent - consistent with 'A'-suffix devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge for 93C-series. |
| CLK (Pin 2) | Serial Clock | Rising-edge synchronized I/O; stops/resumes freely; no clock required during auto-erase/write cycle. |
| DI (Pin 3) | Data Input | Accepts Start bit, opcode, address, and write data; must be stable before TDIS setup time (50–250 ns). |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status valid only if CS raised after ≥250 ns low. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal circuitry; decoupling capacitor required near VCC–VSS. |
| NC (Pin 6, 7) | No Connection | Internally unconnected; must be left floating or tied to VSS/VCC per layout best practice - no functional role. |
| VCC (Pin 8) | Power Supply | 4.5–5.5 V nominal; powers internal logic and memory array; POR circuit disables writes below 3.8 V. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - TWC = 2 ms for 93C-series; device manages internal charge pump and verify automatically. |
| Automatic ERAL before WRAL | Ensures full array erasure prior to bulk write - prevents partial-data corruption without host software intervention. |
| Power-on/off data protection | Hardware-level write inhibition when VCC < 3.8 V - prevents inadvertent writes during brown-out or power ramp. |
| Ready/Busy status via DO | Enables non-blocking polling - host reads DO while CS high post-TCSL to determine completion without fixed delays. |
| 1M endurance / 200-year retention | Supports long-life automotive applications (e.g., ECU calibration storage) with minimal wear leveling overhead. |
Applications
| Engine Control Unit (ECU) Calibration Storage | Body Control Module (BCM) Configuration Memory |
|---|---|
Use Scenario: Storing trim values, sensor offsets, and adaptive learning parameters that persist across ignition cycles in gasoline/diesel engine ECUs. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently via Microwire during startup or service mode - operates at ≤3 MHz clock rate with deterministic 2 ms write latency. Use Value: Ensures parameter integrity during cranking (VCC dip to 4.5 V) via POR lockout and eliminates need for external backup capacitors or supervisory ICs. | Use Scenario: Holding door lock logic states, lighting profiles, and seat position presets in automotive BCMs subject to wide ambient temperature swings. IC Role / Device Role / Timing Role: Serial EEPROM interfaced to 8-bit microcontroller GPIOs - uses CS/CLK/DI/DO signals with no additional level-shifting due to 4.5–5.5 V native compatibility. Use Value: Automotive temperature rating (−40°C to +125°C) and 1M endurance allow >15-year field life without recalibration or replacement. |
| Industrial PLC I/O Module Parameter Backup | Medical Infusion Pump Safety Settings |
Use Scenario: Retaining channel-specific gain/offset calibration constants and fault history logs in DIN-rail mounted PLC analog I/O modules. IC Role / Device Role / Timing Role: Microwire-configured nonvolatile memory accessed during module initialization - leverages WRAL command to restore full configuration from known-good image. Use Value: WRAL + ERAL automation reduces firmware complexity and guarantees atomic restore - critical for deterministic boot behavior in safety-critical control systems. | Use Scenario: Securing drug library limits, dose rate constraints, and alarm thresholds in battery-powered infusion pumps requiring FDA Class II compliance. IC Role / Device Role / Timing Role: Tamper-resistant configuration store - write-protected by EWEN/EWDS protocol and powered only during active programming to minimize energy use. Use Value: 200-year data retention ensures settings survive device shelf life and field deployment without periodic refresh - meeting ISO 14971 risk management requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46BT-E/SN | 16-bit (64 × 16) organization; same VCC range, temp grade, and SOIC-8 package. | Requires host firmware to manage 16-bit word alignment; incompatible with existing 8-bit address/data framing. | Select only if system architecture mandates 16-bit data path and memory map efficiency outweighs firmware porting effort. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 2.5–5.5 V, industrial temp only (−40°C to +85°C). | Lacks automotive qualification; requires CS/CLK/MOSI/MISO routing - incompatible pinout and protocol stack. | Consider for cost-sensitive industrial designs where AEC-Q100 compliance is not required and SPI infrastructure already exists. |
Compared with 93C46BT-E/SN, the 93C46AX-E/SN provides native 8-bit compatibility without address remapping; versus AT25010B-MAHL-T, it delivers automotive-grade reliability and Microwire simplicity at the expense of SPI ecosystem integration.
Availability
93C46AX-E/SN is available at Aetrix Electronics and suitable for automotive control units, industrial programmable logic controllers, medical infusion devices, and body electronics requiring stable component supply with full lifecycle traceability.
Supply support for 93C46AX-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 family was designed specifically for cost-sensitive, low-power, nonvolatile memory applications in automotive and industrial systems - emphasizing robustness, protocol simplicity, and long-term data integrity over high-speed throughput.
FAQ
What is the function of the ORG pin on the 93C46AX-E/SN?
The ORG pin is not present on the 93C46AX-E/SN. As an 'A'-suffix device, it has a fixed 8-bit (128 × 8) memory organization. The ORG pin exists only on 'C'-suffix variants (e.g., 93C46C) to select between 8-bit and 16-bit modes. On 93C46AX-E/SN, Pins 6 and 7 are NC (no internal connection), confirming absence of ORG functionality.
Does the 93C46AX-E/SN support SPI communication?
No, the 93C46AX-E/SN does not support SPI. It implements a Microwire-compatible 3-wire serial interface (CS, CLK, DI/DO) with specific instruction opcodes and timing - distinct from SPI's 4-wire protocol (CS, CLK, MOSI, MISO) and frame structure. Attempting SPI-level communication will result in unrecognized commands and failed read/write operations.
What is the minimum VCC required to execute ERAL or WRAL on the 93C46AX-E/SN?
The 93C46AX-E/SN requires VCC ≥ 4.5 V to execute ERAL (Erase All) or WRAL (Write All) commands. This is explicitly stated in the datasheet (DS20001749K, pages 8 and 11). Below 4.5 V, these commands will not initiate, and the device remains in standby or rejects the instruction - ensuring data integrity during brown-out conditions.
How is Ready/Busy status monitored on the 93C46AX-E/SN?
Ready/Busy status is monitored by reading the DO pin after bringing CS high following a minimum 250 ns low period (TCSL). During erase/write, DO = low indicates busy; DO = high indicates completion. The status is only valid if CS is actively toggled - DO remains in High-Z if CS stays continuously low throughout the operation.
Is the 93C46AX-E/SN RoHS compliant and lead-free?
Yes, the 93C46AX-E/SN is RoHS compliant and features a Pb-free Matte Tin (Sn) finish, as confirmed in the device selection table and packaging section of DS20001749K. The 'SN' package suffix denotes SOIC with lead-free termination, and all packages in the 93XX46 series meet JEDEC J-STD-609A Class 1 moisture sensitivity and RoHS Directive 2011/65/EU requirements.
93C46AX-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
93C46AX-E/SN FAQ
1.How can I place an order for 93C46AX-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46AX-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 93C46AX-E/SN reliable?
The price and inventory of 93C46AX-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 93C46AX-E/SN is usually 5 days.
3.What payment methods are accepted for 93C46AX-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46AX-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46AX-E/SN?
93C46AX-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46AX-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 93C46AX-E/SN?
For technical support, including 93C46AX-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46AX-E/SN requirements.
6.How does Aetrix verify that 93C46AX-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C46AX-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 93C46AX-E/SN meets industry standards.
7.What is the process for return or replacement of 93C46AX-E/SN?
All 93C46AX-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46AX-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 93C46AX-E/SN part is unused and in its original packaging.
Return procedure for 93C46AX-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46AX-E/SN Tags
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