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Microchip Technology 93C46AT-E/MS
- Part No.:
- 93C46AT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C46AT-E/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
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Product details
Overview
93C46AT-E/MS from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature grade (–40°C to +85°C). It features self-timed erase/write cycles, automatic erase-all-before-write-all (ERAL/WRAL), and Ready/Busy status signaling via DO pin. Used for configuration storage in embedded controllers and power management systems.
For engineers reviewing the 93C46AT-E/MS datasheet, 93C46AT-E/MS pinout, 93C46AT-E/MS application, or 93C46AT-E/MS equivalent, key selection criteria include voltage compatibility (4.5–5.5 V only), 8-bit fixed organization (no ORG pin), MSOP-8 package footprint, 2 ms write cycle time, and automotive-grade data retention (>200 years).
Technical Context
The 93C46AT-E/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present, confirming fixed 128 × 8-bit memory mapping. It uses CMOS EEPROM technology with on-chip charge pump for internal programming voltage generation.
Operation requires EWEN instruction prior to any erase/write; power-on default is EWDS mode. Ready/Busy status is polled via DO pin after CS high assertion following ≥250 ns CS low time (TCSL), with TWC = 2 ms typical erase/write cycle time at VCC ≥ 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 words × 8 bits); supports compact configuration storage without external address decoding. |
| VCC Range | 4.5 V to 5.5 V only; not compatible with 3.3 V or 2.5 V systems - requires dedicated 5 V rail or regulator. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); no SPI mode or quad I/O - minimal GPIO usage. |
| Write Cycle Time | 2 ms max (TWC); enables fast firmware parameter updates without blocking host MCU for extended periods. |
| Data Retention | 200+ years at TA ≤ +85°C; ensures long-term reliability in unattended industrial equipment. |
| Endurance | 1,000,000 erase/write cycles; supports frequent calibration or logging use cases over product lifetime. |
| Temperature Range | –40°C to +85°C (Industrial grade); validated for operation in factory automation and motor control enclosures. |
Pinout & Package
8-pin MSOP (Mini Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating). Pin 1 marked by laser dot; pin 1 ID corner confirmed per Microchip DS20001749K-page 24.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions (TCSL) to reset internal state. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clock required during 2 ms write cycle. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address (A6–A0), and data (D7–D0); tied to DO only with series resistor to avoid bus conflict. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read operations. |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; exposed pad may be connected to VSS for thermal relief. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating - no pull-up/down or routing required. |
| 7 (ORG) | Organization Select | Not present on 93C46A/B variants; pin 7 is NC - device is fixed 8-bit (128 × 8), no configuration needed. |
| 8 (VCC) | Power Supply | 4.5–5.5 V only; POR threshold at 3.8 V (VPOR); below this, all operations inhibited including reads. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control - host MCU initiates command and polls DO for completion. |
| Auto-ERAL before WRAL | WRAL instruction includes automatic full-array erase, removing separate ERAL step and reducing firmware complexity. |
| Power-On/Off Data Protection | Hardware-level write inhibition below 3.8 V VCC prevents corruption during brown-out or hot-plug events. |
| Ready/Busy Status Signaling | DO pin doubles as status indicator - avoids need for dedicated interrupt or polling delay timers in host code. |
| Low Standby Current | ≤5 µA (ICCS) at VCC = 5 V - suitable for battery-backed or energy-sensitive applications. |
Applications
| Industrial Motor Control | Smart Energy Metering |
|---|---|
|
Use Scenario: Storing calibrated current/voltage offset values and firmware revision flags across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during startup or calibration routines. Use Value: 1M endurance and 200-year retention ensure accuracy remains intact over 15+ year meter lifetime without recalibration. |
Use Scenario: Holding tariff tables, billing counters, and security keys in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for critical billing data with hardware write protection. Use Value: EWEN/EWDS commands prevent accidental overwrite during firmware updates or transient noise events. |
| Automotive Body Control Module | Medical Infusion Pump |
|
Use Scenario: Saving seat/mirror position presets and lighting configuration profiles in BCM microcontrollers. IC Role / Device Role / Timing Role: Low-pin-count serial EEPROM interfaced directly to 8-bit MCU GPIOs with minimal board space. Use Value: MSOP-8 package (3×3 mm) reduces PCB area vs SOIC-8 by >50%, easing layout in space-constrained modules. |
Use Scenario: Storing drug library parameters, dose limits, and audit logs compliant with IEC 62304 Class C software requirements. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory with deterministic 2 ms write time for traceable event logging. Use Value: Fixed 4.5–5.5 V operation aligns with medical-grade 5 V power rails, eliminating level-shifting components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46AT-I/MS | Wider VCC range (2.5–5.5 V); same 128 × 8-bit organization; identical MSOP-8 package and pinout. | Supports 3.3 V systems; lacks 93C46AT-E/MS's higher VCC noise immunity and tighter 4.5–5.5 V margin. | Select if migrating from 3.3 V designs or requiring dual-voltage compatibility; verify system VCC stability at 2.5 V. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, SOIC-8/UDFN-8; no Ready/Busy pin - relies on WIP flag polling. | Requires additional chip select line and SPI peripheral; no DO-as-status feature - increases host software overhead. | Select for SPI-native platforms or where multi-device daisy-chaining is needed; accept added firmware complexity for broader voltage support. |
Compared with 93LC46AT-I/MS, the 93C46AT-E/MS offers superior noise immunity in noisy 5 V environments but sacrifices 3.3 V flexibility; versus AT25010B-MAHL-T, it reduces pin count and simplifies status checking at the cost of interface standardization.
Availability
93C46AT-E/MS is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, automotive body electronics, and medical infusion pump designs requiring stable component supply across extended production lifecycles.
Supply support for 93C46AT-E/MS 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx family was designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal external components and robust power-supply immunity.
FAQ
What is the memory organization of the 93C46AT-E/MS?
The 93C46AT-E/MS has a fixed 128 × 8-bit organization - it is an 'A' variant, meaning no ORG pin is implemented and word size cannot be changed. This is confirmed in the Device Selection Table (DS20001749K-page 1) and Pin Function Table (page 12), where pin 7 is designated NC, not ORG. The 93C46AT-E/MS stores 128 bytes accessible via 7-bit addresses (A6–A0).
Does the 93C46AT-E/MS support 3.3 V operation?
No, the 93C46AT-E/MS does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V, as stated in the Device Selection Table (page 1) and Absolute Maximum Ratings (page 3). Attempting to operate below 4.5 V risks failure to execute commands or corrupted writes due to insufficient internal charge pump voltage.
How is Ready/Busy status monitored on the 93C46AT-E/MS?
Ready/Busy status is monitored by reading the DO pin after asserting CS high for ≥250 ns following a minimum CS low time (TCSL). DO = low indicates ongoing erase/write; DO = high means complete. This is documented in Section 2.4 (Erase Timing) and Figure 2-1/2-2 (pages 7–8), and applies identically to WRITE, ERASE, ERAL, and WRAL operations.
Is the 93C46AT-E/MS RoHS compliant and Pb-free?
Yes, the 93C46AT-E/MS is RoHS compliant and features a Pb-free Matte Tin (Sn) finish, as explicitly stated in the Features section (page 1) and Packaging Information (page 14). The "E" in the part number denotes Industrial temperature grade, not environmental compliance - RoHS status is universal across all 93XX46 variants per Microchip's packaging specification.
What is the maximum clock frequency supported by the 93C46AT-E/MS?
The 93C46AT-E/MS supports up to 3 MHz clock frequency (FCLK) when VCC is 4.5–5.5 V, as specified in Table 1-2 (AC Characteristics, page 4, Param. A1). This limit applies to all instructions - READ, WRITE, ERASE, and status polling - and is independent of temperature grade since the device is rated only for Industrial (I) range.
93C46AT-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
93C46AT-E/MS FAQ
1.How can I place an order for 93C46AT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46AT-E/MS 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 93C46AT-E/MS reliable?
The price and inventory of 93C46AT-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46AT-E/MS is usually 5 days.
3.What payment methods are accepted for 93C46AT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46AT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46AT-E/MS?
93C46AT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46AT-E/MS 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 93C46AT-E/MS?
For technical support, including 93C46AT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46AT-E/MS requirements.
6.How does Aetrix verify that 93C46AT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93C46AT-E/MS 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 93C46AT-E/MS meets industry standards.
7.What is the process for return or replacement of 93C46AT-E/MS?
All 93C46AT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C46AT-E/MS, 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 93C46AT-E/MS part is unused and in its original packaging.
Return procedure for 93C46AT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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