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Microchip Technology 93C46A/W15K
- Part No.:
- 93C46A/W15K
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
93C46A/W15K.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,280
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Product details
Overview
93C46A/W15K 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/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 embedded controllers and automotive body modules.
For engineers reviewing the 93C46A/W15K datasheet, 93C46A/W15K pinout, 93C46A/W15K application, or 93C46A/W15K equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), 2 ms program cycle time, 1 million endurance cycles, >200-year data retention, and compatibility with legacy Microwire-based microcontrollers requiring nonvolatile parameter storage.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins operating at up to 3 MHz (VCC ≥ 4.5 V), supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its internal logic enforces power-on write protection and requires explicit EWEN before any programming operation.
The 93C46A/W15K uses dedicated 8-bit memory organization (no ORG pin), eliminating external configuration logic. All timing parameters - including TCSL (250 ns min), TPD (≤400 ns), and TWC (2 ms) - are specified across −40°C to +125°C and 4.5–5.5 V, ensuring deterministic behavior in automotive-grade systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - provides compact nonvolatile storage for calibration data, device IDs, or user settings in space-constrained designs. |
| VCC range | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and automotive battery-supplied systems with regulated 5 V supplies. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates such as firmware version logging or usage counters in industrial equipment. |
| Data retention | Greater than 200 years at +25°C - ensures long-term reliability without periodic refresh in unattended infrastructure applications. |
| Program cycle time | 2 ms (TWC) - enables fast parameter updates during system initialization or runtime reconfiguration without blocking host MCU execution. |
| Operating temperature | −40°C to +125°C (I/E grade) - qualified for under-hood automotive ECUs and industrial motor drives exposed to extreme thermal cycling. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® microcontrollers and other Microwire-hosted systems without protocol translation. |
Pinout & Package
93C46A/W15K is packaged in an 8-lead SOIC (SOIC-8, package code SN), with Pb-free Matte Tin finish. Pin 1 is marked by laser dot; pin 1 ID corner is top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable signal; must be held low ≥250 ns between commands; initiates self-timed programming on falling edge (93C series). |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; rising edge triggers write cycle completion on last bit (93C series). |
| 3 (DI) | Data Input | Accepts Start bit, instruction opcodes, addresses, and write data; high-impedance when not selected. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge; requires CS high ≥250 ns to sample status. |
| 5 (VSS) | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| 6 (NC) | No Connection | Internally unconnected; must be left floating or tied to VSS per layout best practice - no functional role. |
| 7 (NC) | No Connection | Internally unconnected; identical to Pin 6 - no routing or loading required. |
| 8 (VCC) | Power Supply | 4.5–5.5 V supply input; includes internal POR detection at 3.8 V; powers all internal logic and memory array. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host MCU only monitors DO pin for Ready/Busy; reduces firmware complexity and interrupt load. |
| Automatic ERAL before WRAL | Guarantees full-array erasure prior to bulk write - prevents data corruption when overwriting entire memory without manual ERAL command sequence. |
| Power-on/off data protection | Hardware-enforced write inhibition below 3.8 V VCC - prevents partial writes during brown-out or power-up transients in automotive environments. |
| Erase/write disable/enable (EWDS/EWEN) | Prevents accidental writes after power-up (default = EWDS); requires explicit EWEN before first programming - critical for safety-critical firmware storage. |
| Ready/Busy status on DO | Enables polling-based programming flow without dedicated status register - simplifies driver implementation on resource-limited MCUs. |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing door lock actuator calibration offsets and seat position presets across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter memory interfaced directly to 8-bit automotive MCU via Microwire bus; accessed during boot and runtime. Use Value: Ensures consistent mechanical behavior after power loss; leverages 125°C rating for under-dash mounting near HVAC ducts. |
Use Scenario: Retaining I/O mapping tables and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent configuration storage independent of main controller's volatile RAM. Use Value: Enables hot-swap capability and field reconfiguration without firmware reload; 1M endurance supports daily parameter updates over 10+ years. |
| Medical Infusion Pump Settings | Smart Energy Meter Calibration Data |
Use Scenario: Securing drug delivery rate limits and user-access permissions across power interruptions in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory holding regulatory-mandated configuration values; accessed only during initialization. Use Value: Meets IEC 62304 requirements for data integrity; >200-year retention eliminates recalibration service intervals. |
Use Scenario: Storing meter-specific ADC gain/offset coefficients and tariff schedules in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Calibration memory accessed once per power-up by metrology ASIC; isolated from main application processor. Use Value: Maintains billing accuracy over 20+ year field life; 4.5–5.5 V range matches meter's isolated DC-DC output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46A-I/SN | Wider VCC range (2.5–5.5 V); same 128×8 organization and SOIC-8 package; supports −40°C to +85°C (I-temp only). | Lacks automotive temperature qualification; suitable for commercial/industrial systems with lower supply voltage flexibility. | Select when operating below 4.5 V or where AEC-Q100 qualification is not required - avoids over-specifying voltage margin. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1.8–5.5 V, 128×8 organization; 1M endurance; SOIC-8; RoHS compliant. | Different protocol stack (SPI vs Microwire); requires host driver rewrite; no native Ready/Busy pin - relies on WIP polling. | Choose for new designs using SPI peripherals; avoid in legacy Microwire-based systems unless firmware update is feasible. |
Compared with 93LC46A-I/SN, the 93C46A/W15K offers guaranteed automotive temperature operation and tighter VCC regulation tolerance, while AT25010B-MAHL-T trades protocol compatibility for broader voltage support and industry-standard SPI integration - making each optimal for distinct platform constraints.
Availability
93C46A/W15K is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and medical device manufacturing requiring stable component supply across extended product lifecycles.
Supply support for 93C46A/W15K 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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93C46A/W15K belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, high-reliability nonvolatile memory applications in automotive, industrial, and consumer systems requiring Microwire protocol compatibility.
FAQ
What is the memory organization of the 93C46A/W15K?
The 93C46A/W15K has a fixed 128 × 8-bit organization - meaning it stores 128 bytes of data, accessible as 8-bit words. Unlike 'C' variants, it lacks an ORG pin and does not support 16-bit mode. This simplifies hardware design by removing the need for external logic to configure word size, making it ideal for legacy Microwire systems with byte-oriented data structures.
Does the 93C46A/W15K require an external pull-up resistor on the DO pin?
No, the 93C46A/W15K does not require an external pull-up on DO. The DO pin actively drives high or low during READ or Ready/Busy status reporting and enters High-Z when deselected or idle. However, if DI and DO are shorted (bus-sharing configuration), a current-limiting resistor is recommended to prevent bus conflict during dummy-zero read cycles - as documented in Section 2.2 of the datasheet.
What is the minimum VCC required for reliable operation of the 93C46A/W15K?
The 93C46A/W15K requires VCC ≥ 4.5 V for all operations, with a typical power-on reset threshold of 3.8 V. Below 4.5 V, write operations (including ERAL and WRAL) are inhibited, and the device remains in EWDS mode. This ensures data integrity during brown-out conditions common in automotive 12 V battery systems with noisy DC-DC regulation.
How does the 93C46A/W15K handle power loss during a write cycle?
The 93C46A/W15K incorporates hardware-level power-loss protection: if VCC drops below ~3.8 V during programming, the internal write sequence aborts and the memory cell retains its pre-write state. No partial writes occur. This behavior is enforced by the on-chip voltage detector (VPOR), which disables all write functions until VCC stabilizes above the threshold - critical for automotive and industrial deployments.
Is the 93C46A/W15K pin-compatible with other 93XX46 devices in SOIC-8 packages?
Yes, the 93C46A/W15K shares identical SOIC-8 pinout (SN package) with all 93XX46A/B/C variants - including CS, CLK, DI, DO, VSS, NC, NC, VCC assignments. However, functional compatibility depends on voltage range and temperature grade: 93C46A/W15K is rated for 4.5–5.5 V and −40°C to +125°C, whereas 93AA46A or 93LC46A operate at lower voltages and/or narrower temperature ranges.
93C46A/W15K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
93C46A/W15K FAQ
1.How can I place an order for 93C46A/W15K through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46A/W15K 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 93C46A/W15K reliable?
The price and inventory of 93C46A/W15K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46A/W15K is usually 5 days.
3.What payment methods are accepted for 93C46A/W15K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46A/W15K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46A/W15K?
93C46A/W15K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46A/W15K 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 93C46A/W15K?
For technical support, including 93C46A/W15K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46A/W15K requirements.
6.How does Aetrix verify that 93C46A/W15K is sourced from the original manufacturer or authorized distributors?
All 93C46A/W15K 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 93C46A/W15K meets industry standards.
7.What is the process for return or replacement of 93C46A/W15K?
All 93C46A/W15K units undergo pre-shipment inspection (PSI). If there is an issue with 93C46A/W15K, 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 93C46A/W15K part is unused and in its original packaging.
Return procedure for 93C46A/W15K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46A/W15K Tags
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M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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