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Microchip Technology AT93C46EN-SH-B
- Part No.:
- AT93C46EN-SH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C46EN-SH-B.pdf
- Description:
- IC EEPROM 1KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
AT93C46EN-SH-B from Microchip Technology is a 1-Kbit three-wire serial EEPROM with user-selectable 128 × 8 or 64 × 16 organization, operating from 1.8V to 5.5V, rated for -40°C to +85°C industrial temperature range, and featuring 1,000,000 write cycles and 100-year data retention. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT93C46EN-SH-B datasheet, AT93C46EN-SH-B pinout, AT93C46EN-SH-B application, or AT93C46EN-SH-B equivalent, key selection considerations include its fixed 8-lead SOIC package, absence of ORG pin (x16-only organization), 2 MHz max clock at 5V, self-timed 5 ms write cycle, and compatibility with legacy Atmel-compatible three-wire serial bus protocols.
Technical Context
The AT93C46EN-SH-B implements a synchronous three-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN/EWDS, WRAL, and ERAL. Its internal architecture includes address register, row/column decoders, high-voltage generation, and power-on reset circuitry ensuring reliable operation during power-up sequences.
All operations are synchronized to the rising edge of SK; DO outputs data or Ready/Busy status depending on CS timing relative to tCS. The device defaults to 64 × 16 organization with no ORG pin-unlike AT93C46D-and requires VCC ≥ 4.5V for WRAL/ERAL commands per electrical specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,024 bits organized exclusively as 64 words × 16 bits - no x8 option due to missing ORG pin. |
| Supply Voltage | 1.8V to 5.5V - supports low-power battery-backed systems and standard 3.3V/5V logic domains. |
| Max Clock Frequency | 2 MHz at VCC = 4.5–5.5V - enables fast configuration reads in time-critical boot sequences. |
| Write Cycle Time | ≤5 ms - self-timed; eliminates need for external delay or polling overhead in firmware. |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C - suitable for field-updatable calibration tables. |
| Operating Temperature | -40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor IoT nodes. |
| Interface Protocol | Three-wire serial (CS/SK/DI/DO) - minimal GPIO usage; compatible with microcontroller SPI peripherals in bit-banged mode. |
Pinout & Package
AT93C46EN-SH-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm body, 1.27 mm pitch). Pin 1 is marked by a beveled corner or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable: device responds only when CS = HIGH; DO enters high-Z when CS = LOW. |
| 2 (SK) | Serial Data Clock | Rising-edge synchronized I/O: latches DI and clocks DO; max 2 MHz at 5V. |
| 3 (DI) | Serial Data Input | Accepts instruction opcodes (READ, WRITE, EWEN, etc.), addresses, and data bits. |
| 4 (DO) | Serial Data Output | Outputs read data or Ready/Busy status (logic '1' = ready) after CS reassertion post-write. |
| 5 (GND) | Ground Reference | System ground return path; must be low-impedance for stable EEPROM operation. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating - not tied to VCC/GND (ORG function omitted). |
| 7 (NC) | No Connect | Unused pin; no internal connection; leave unconnected per datasheet guidance. |
| 8 (VCC) | Power Supply | 1.8–5.5V supply input; requires local 0.1 µF ceramic bypass capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed x16 memory organization | Eliminates external ORG pin routing and configuration logic - simplifies PCB layout and firmware initialization. |
| Self-timed write cycle | Removes requirement for firmware wait states or external timing components; tWP ≤ 5 ms guaranteed across voltage/temp. |
| Industrial-grade temperature range | Validated operation from -40°C to +85°C ensures reliability in harsh environments without derating. |
| Green RoHS-compliant packaging | Lead-free, halide-free SOIC meets global environmental compliance requirements for commercial and industrial shipments. |
| Atmel legacy command compatibility | Supports identical instruction set (READ, WRITE, EWEN, EWDS, ERAL, WRAL) as original Atmel AT93C46 series - drop-in replacement. |
Applications
| Industrial Sensor Calibration | Embedded Power Management |
|---|---|
|
Use Scenario: Storing factory-trimmed offset/gain coefficients and temperature compensation curves for analog sensor front-ends. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during system boot or sensor initialization. Use Value: Enables field-replaceable sensors with unique calibration data preserved across power cycles and firmware updates. |
Use Scenario: Holding programmable overvoltage/undervoltage thresholds, soft-start timing, and fault log history in DC-DC controller modules. IC Role / Device Role / Timing Role: Persistent parameter store interfaced via MCU GPIO bit-banging during power-up sequence. Use Value: Allows end-user customization of protection limits without hardware changes or reprogramming flash. |
| Consumer Audio Device Settings | Smart Meter Configuration |
|
Use Scenario: Retaining user preferences (volume level, EQ profile, input source) in portable speakers and soundbars. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed infrequently during UI state changes or power-on reset. Use Value: Maintains settings through battery depletion or AC disconnect; operates reliably down to 1.8V supply. |
Use Scenario: Storing tariff schedules, metering constants, and communication parameters in utility-grade electricity meters. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory for regulatory-mandated configuration data. Use Value: Meets IEC 62056 and ANSI C12.22 requirements for 100-year data retention under elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95128-DFMN6TP | 128-Kbit SPI EEPROM, 8-pin SOIC, 20 MHz max clock, 5 ms write cycle, 400 kHz I²C-compatible mode. | Higher density and faster interface; requires SPI peripheral or software emulation - not pin-compatible. | Select when >1 Kbit capacity or SPI-native interface is required; verify firmware driver compatibility. |
| BR24G01FJ-WE2 | 1-Kbit I²C EEPROM, 8-pin SOIC, 1 MHz max clock, 5 ms write cycle, built-in write protection and address pins. | Different protocol (I²C vs. three-wire); requires pull-up resistors and ACK/NACK handling - not electrically interchangeable. | Choose for systems already using I²C buses; avoid if existing design relies on CS/SK/DI/DO timing or Atmel command set. |
Compared with M95128-DFMN6TP and BR24G01FJ-WE2, the AT93C46EN-SH-B offers direct Atmel command compatibility and minimal GPIO footprint for legacy designs, while trading off density and interface speed for proven interoperability in cost-sensitive industrial applications.
Availability
AT93C46EN-SH-B is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, consumer audio device settings, and smart meter configuration requiring stable component supply across long production lifecycles.
Supply support for AT93C46EN-SH-B 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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions with ISO 9001-certified quality systems.
The AT93C46EN-SH-B belongs to Microchip's legacy Atmel-compatible serial EEPROM product line, designed specifically for space-constrained, low-power embedded systems needing robust, pin-efficient nonvolatile storage.
FAQ
What is the memory organization of AT93C46EN-SH-B?
The AT93C46EN-SH-B is internally organized exclusively as 64 words × 16 bits (1,024 bits total). Unlike the AT93C46D, it lacks the ORG pin and therefore does not support user-selectable 128 × 8 configuration. This fixed x16 structure simplifies design and eliminates external ORG pin routing.
Does AT93C46EN-SH-B support 1.8V operation?
Yes, AT93C46EN-SH-B operates across 1.8V to 5.5V. At 1.8V, maximum clock frequency is 250 kHz, standby current is ≤1.0 µA, and write cycle time remains ≤5 ms. Full 2 MHz operation requires VCC ≥ 4.5V per AC characteristics table.
What is the purpose of pins 6 and 7 on AT93C46EN-SH-B?
Pins 6 and 7 on AT93C46EN-SH-B are No Connect (NC) terminals. Pin 6 corresponds to the ORG function omitted in the AT93C46E variant, and pin 7 has no internal connection. Both must remain unconnected - neither tied to VCC nor GND - per Microchip's datasheet guidance.
Can AT93C46EN-SH-B replace AT93C46D in existing designs?
AT93C46EN-SH-B can replace AT93C46D only if the design uses fixed 64 × 16 organization and leaves pin 6 (ORG) unconnected. It is not a drop-in replacement when x8 mode is required or when ORG pin is actively driven, as AT93C46EN-SH-B lacks ORG functionality entirely.
What write protection mechanisms does AT93C46EN-SH-B implement?
AT93C46EN-SH-B uses instruction-level write protection: the EWEN (Erase/Write Enable) command must precede any WRITE, ERASE, WRAL, or ERAL operation, and EWDS (Erase/Write Disable) disables further programming until the next EWEN. No hardware write-protect pin is present.
AT93C46EN-SH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 64 x 16
- Memory Interface:
- 3-Wire Serial
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C46EN-SH-B FAQ
1.How can I place an order for AT93C46EN-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C46EN-SH-B 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 AT93C46EN-SH-B reliable?
The price and inventory of AT93C46EN-SH-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C46EN-SH-B is usually 5 days.
3.What payment methods are accepted for AT93C46EN-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C46EN-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C46EN-SH-B?
AT93C46EN-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C46EN-SH-B 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 AT93C46EN-SH-B?
For technical support, including AT93C46EN-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C46EN-SH-B requirements.
6.How does Aetrix verify that AT93C46EN-SH-B is sourced from the original manufacturer or authorized distributors?
All AT93C46EN-SH-B 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 AT93C46EN-SH-B meets industry standards.
7.What is the process for return or replacement of AT93C46EN-SH-B?
All AT93C46EN-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT93C46EN-SH-B, 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 AT93C46EN-SH-B part is unused and in its original packaging.
Return procedure for AT93C46EN-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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