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Microchip Technology AT93C66B-MAHM-E
- Part No.:
- AT93C66B-MAHM-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT93C66B-MAHM-E.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:14,968
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Product details
Overview
AT93C66B-MAHM-E from Microchip Technology is a 4-Kbit three-wire serial EEPROM organized as 512 × 8 or 256 × 16, operating from 1.7V to 5.5V across -40°C to +85°C. It features self-timed write cycles (≤5 ms), 1,000,000 write endurance, and 100-year data retention. Used for configuration storage in industrial controllers, sensor calibration modules, and embedded power management systems.
For engineers reviewing the AT93C66B-MAHM-E datasheet, AT93C66B-MAHM-E pinout, AT93C66B-MAHM-E application, or AT93C66B-MAHM-E equivalent, key selection factors include voltage range compatibility (1.7–5.5V), ORG-pin-selectable memory organization, industrial temperature rating, and SOIC-8 package footprint with verified three-wire timing compliance at up to 2 MHz (5V).
Technical Context
The AT93C66B-MAHM-E implements a synchronous three-wire interface (CS/SK/DI/DO) with no external clock required beyond SK, supporting READ, WRITE, ERASE, EWEN/EWDS, WRAL, and ERAL commands. Its internal organization is dynamically selected via the ORG pin-tied to VCC for 256 × 16 mode or GND for 512 × 8 mode-with internal 10 MΩ pull-up enabling x16 default if unconnected.
It integrates on-chip high-voltage generation for EEPROM programming, Power-on Reset (POR) circuitry with 1.5 V threshold, and status feedback via DO pin during write/erase operations. All AC timing-including tSKH/tSKL, tCS, tWP (0.1–5 ms), and tPD0/tPD1-is fully characterized across 1.7V–5.5V supply and -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,096 bits (512 × 8 or 256 × 16), directly selectable via ORG pin connection |
| Supply Voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without level shifters |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded control and automotive body electronics |
| Write Cycle Time | Max 5 ms - self-timed; eliminates need for external polling or timeout logic in host firmware |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C - supports long-life field-deployed devices |
| Interface Speed | Up to 2 MHz clock rate at 5V - delivers ~200 kbps effective read throughput in sequential mode |
| Package | 8-lead SOIC (3.9 mm body) - industry-standard footprint compatible with automated PCB assembly |
Pinout & Package
AT93C66B-MAHM-E uses an 8-lead SOIC package (Microchip drawing C04-057-SN) with 1.27 mm pitch, 3.90 mm body width, and JEDEC MS-012AC compliant footprint. Pin 1 is marked by a bevelled corner or dot; exposed pad is absent in SOIC variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: device enters active state only when CS = HIGH; DO goes high-Z when CS = LOW |
| SK | Serial Data Clock | Rising-edge synchronized I/O: all DI data latched and DO data shifted out on SK rising edge |
| DI | Serial Data Input | Accepts instruction opcodes (READ/EWEN/WRITE), addresses, and write data; no internal pull-up |
| DO | Serial Data Output | Outputs read data, Ready/Busy status (logic '0' = busy, '1' = ready), and high-Z when CS = LOW |
| GND | Ground Reference | System ground return path; must be low-impedance connection to minimize noise coupling into EEPROM array |
| ORG | Organization Select | Configures memory map: VCC → 256 × 16, GND → 512 × 8; unconnected defaults to x16 via internal pull-up |
| NC | No Connect | Pin 7 is internally unused and must remain floating; no routing or soldering required |
| VCC | Power Supply | Single-supply input (1.7–5.5V); powers logic, EEPROM array, and on-chip HV generator |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 layout via ORG pin-enables optimal byte vs. word addressing without firmware changes |
| Self-timed write cycle | Internal timing engine completes erase/write within 5 ms max-removes need for host-controlled delay loops or status polling overhead |
| Three-wire serial interface | Minimal GPIO usage (CS/SK/DI/DO)-reduces MCU pin count and PCB routing complexity versus SPI or I²C EEPROMs |
| Industrial temperature range | Valid operation from -40°C to +85°C-supports deployment in motor drives, HVAC controls, and outdoor metering equipment |
| Green packaging | RoHS-compliant, lead-free, halide-free SOIC-meets IPC-J-STD-609A Class 1 moisture sensitivity and JESD22-A110 reliability standards |
Applications
| Industrial Sensor Calibration | Embedded Power Sequencing |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding calibration constants accessed at system boot before ADC initialization. Use Value: Enables single-BOM production across multiple sensor variants; eliminates manual potentiometer adjustment and reduces test time by 40%. |
Use Scenario: Holding power-up delay sequences, rail enable order, and fault recovery thresholds for multi-rail DC-DC systems in telecom base stations. IC Role / Device Role / Timing Role: Configuration store for PMIC sequencer logic-read during POR to configure voltage ramp rates and interlock conditions. Use Value: Guarantees deterministic power sequencing across temperature and voltage corners; prevents IC latch-up during cold start. |
| Medical Device Parameter Storage | Smart Energy Meter Firmware Patching |
Use Scenario: Retaining user-defined therapy parameters (e.g., infusion rate limits, alarm thresholds) in portable insulin pumps between battery swaps. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile memory accessed only during setup mode-retains data for >10 years with zero refresh current. Use Value: Meets IEC 62304 Class B software safety requirements; eliminates risk of parameter loss during 10-year device lifetime. |
Use Scenario: Storing validated firmware patch images and version metadata in utility-grade electricity meters deployed in remote substations. IC Role / Device Role / Timing Role: Field-upgradable code repository-patches loaded via optical port and verified before execution using stored CRC. Use Value: Enables over-the-air updates without replacing meter hardware; supports AES-128 encrypted patch authentication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M04-DRMN6TP/K | 4-Mbit SPI interface, 20 MHz max clock, 5 ms write cycle, SOIC-8 package | Requires SPI-capable MCU; higher density but no ORG-pin organization flexibility | Select when migrating to higher-density storage with existing SPI infrastructure and no need for x8/x16 reconfiguration |
| 24AA04-I/P | 4-Kbit I²C interface, 1 MHz max clock, 5 ms write cycle, DIP-8 package | Uses two-wire bus (SDA/SCL); incompatible pinout and protocol-requires MCU I²C peripheral and pull-up resistors | Select for legacy through-hole designs or where I²C bus sharing with other peripherals is mandatory |
Compared with M95M04-DRMN6TP/K and 24AA04-I/P, AT93C66B-MAHM-E offers unique ORG-pin memory mapping and three-wire simplicity-ideal for space-constrained, low-pin-count MCU designs needing flexible byte/word access without protocol translation layers.
Availability
AT93C66B-MAHM-E is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power sequencing, medical device parameter storage, and smart energy meter firmware patching requiring stable component supply and long-term lifecycle support.
Supply support for AT93C66B-MAHM-E 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 company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT93C66B-MAHM-E belongs to Microchip's legacy AT93CxxB serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring robust configuration storage in harsh environments.
FAQ
What memory organization does AT93C66B-MAHM-E support?
AT93C66B-MAHM-E supports both 512 × 8 and 256 × 16 configurations, selected by the ORG pin: tie ORG to VCC for x16 mode (256 words), or to GND for x8 mode (512 bytes). If left unconnected, the internal 10 MΩ pull-up selects x16 mode. This hardware-selectable organization avoids firmware-based address remapping and simplifies integration across different host architectures.
Does AT93C66B-MAHM-E require external high-voltage circuitry for writes?
No, AT93C66B-MAHM-E integrates on-chip high-voltage generation for EEPROM programming. All write and erase operations are self-timed and powered solely from the VCC supply (1.7–5.5V). No external charge pump, boost converter, or programming voltage (VPP) pin is needed-reducing BOM count and board area while ensuring reliable operation across voltage grades.
How is Ready/Busy status reported during write cycles on AT93C66B-MAHM-E?
During a write or erase operation, AT93C66B-MAHM-E outputs Ready/Busy status on the DO pin: logic '0' indicates ongoing programming, logic '1' signals completion. To read status, CS must be brought high after being held low for ≥tCS (250 ns at 5V), and DO is sampled on the next SK rising edge. This eliminates need for fixed delays or polling loops in host firmware.
Is AT93C66B-MAHM-E compatible with 1.8V microcontrollers?
Yes, AT93C66B-MAHM-E operates down to 1.7V VCC and specifies full DC/AC performance-including VIH/VIL thresholds, tSKH/tSKL, and tWP-at 1.7V–2.5V. It interfaces directly with 1.8V MCUs without level shifters, provided SK frequency is limited to ≤250 kHz per datasheet Table 4-3, and input/output voltage levels meet specified logic thresholds.
What is the maximum clock frequency supported by AT93C66B-MAHM-E at 3.3V?
At VCC = 3.3V, AT93C66B-MAHM-E supports a maximum SK clock frequency of 1 MHz, as defined in Table 4-3 of the datasheet. This allows reliable communication with common 3.3V microcontrollers (e.g., ARM Cortex-M0/M3, PIC18F) while maintaining timing margins for tSKH (≥1000 ns), tSKL (≥1000 ns), and tCS (≥1000 ns) across temperature and process variation.
AT93C66B-MAHM-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- 3-Wire Serial
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (2x3)
AT93C66B-MAHM-E FAQ
1.How can I place an order for AT93C66B-MAHM-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66B-MAHM-E 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 AT93C66B-MAHM-E reliable?
The price and inventory of AT93C66B-MAHM-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66B-MAHM-E is usually 5 days.
3.What payment methods are accepted for AT93C66B-MAHM-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66B-MAHM-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66B-MAHM-E?
AT93C66B-MAHM-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66B-MAHM-E 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 AT93C66B-MAHM-E?
For technical support, including AT93C66B-MAHM-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66B-MAHM-E requirements.
6.How does Aetrix verify that AT93C66B-MAHM-E is sourced from the original manufacturer or authorized distributors?
All AT93C66B-MAHM-E 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 AT93C66B-MAHM-E meets industry standards.
7.What is the process for return or replacement of AT93C66B-MAHM-E?
All AT93C66B-MAHM-E units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66B-MAHM-E, 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 AT93C66B-MAHM-E part is unused and in its original packaging.
Return procedure for AT93C66B-MAHM-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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