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Microchip Technology AT93C66B-MAHM-T
- Part No.:
- AT93C66B-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT93C66B-MAHM-T.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8MINI MAP
- Quantity:
- Payment:
- Shipping:
Inventory:23,957
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Product details
Overview
AT93C66B-MAHM-T 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, rated for -40°C to +85°C, with 2 MHz max clock rate at 5V and self-timed write cycles ≤5 ms. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT93C66B-MAHM-T datasheet, AT93C66B-MAHM-T pinout, AT93C66B-MAHM-T application, or AT93C66B-MAHM-T equivalent, key selection considerations include voltage range compatibility (1.7–5.5V), ORG-pin-selectable memory organization (x8/x16), industrial temperature rating, and three-wire interface timing constraints at varying VCC levels.
Technical Context
The AT93C66B-MAHM-T implements a synchronous three-wire serial interface (CS/SK/DI/DO) with chip-select–gated communication and rising-edge–synchronized data latching. Its internal architecture includes an address register, row/column decoders, high-voltage generation for EEPROM programming, and a power-on reset circuit ensuring command inhibition until VCC stabilizes above 1.5 V.
Memory organization is dynamically selected via the ORG pin: tied to VCC enables 256 × 16 mode; tied to GND enables 512 × 8 mode; unconnected defaults to x16 via internal 10 MΩ pull-up. All operations-including READ, WRITE, ERASE, WRAL, and ERAL-require prior EWEN instruction and are validated under DC/AC conditions across 1.7–5.5 V and -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8 or 256 × 16), enabling compact firmware parameter or calibration data storage |
| Supply Voltage Range | 1.7 V to 5.5 V - supports direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded systems including motor drives and PLC I/O modules |
| Max Clock Frequency | 2 MHz at 4.5–5.5 V; 1 MHz at 2.5–5.5 V; 250 kHz at 1.7–5.5 V - defines maximum serial throughput and bus loading limits |
| Write Cycle Time | ≤5 ms (typ. 3 ms) - determines minimum time between successive write commands and impacts real-time configuration update latency |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C - ensures long-term reliability in field-deployed devices with infrequent but critical updates |
| Interface Protocol | Three-wire synchronous serial (CS/SK/DI/DO) - reduces PCB routing complexity versus SPI/I²C and avoids protocol arbitration overhead |
Pinout & Package
AT93C66B-MAHM-T 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 pin 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: device ignores DI and tri-states DO when CS is low; required to initiate all commands |
| SK | Serial Data Clock | Rising-edge–synchronized interface clock; controls latching of DI and output timing of DO |
| DI | Serial Data Input | Receives start bit, opcode, address, and write data; sampled on SK rising edge |
| DO | Serial Data Output | Outputs read data or Ready/Busy status (logic 1 = ready, 0 = busy) after CS reassertion post-write |
| GND | Ground Reference | System ground return path for VCC and all I/O; must be low-impedance connection to minimize noise coupling |
| ORG | Organization Select | Configures memory map: VCC = 256 × 16, GND = 512 × 8, floating = 256 × 16 (internal pull-up) |
| NC | No Connect | Internally unused; must remain unconnected per datasheet - no external tie or routing allowed |
| VCC | Power Supply | Primary supply input (1.7–5.5 V); requires local 0.1 µF ceramic decoupling placed within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable x8 or x16 word width via ORG pin, eliminating software remapping for legacy 8-bit vs. 16-bit host interfaces |
| Self-timed write cycle | No external timing control needed - internal state machine manages erase-and-program sequence within guaranteed 5 ms, simplifying host firmware |
| Industrial temperature operation | Validated performance from -40°C to +85°C ensures reliable boot-time parameter loading in outdoor or factory-floor environments |
| Low-voltage capability | Full functionality down to 1.7 V enables direct integration into battery-powered or energy-harvesting subsystems without voltage boosting |
| Green packaging | RoHS-compliant, lead-free, halide-free 8-lead SOIC package meets global environmental compliance requirements for industrial manufacturing |
Applications
| Motor Control Configuration Storage | Smart Sensor Calibration Data |
|---|---|
Use Scenario: Storing motor phase alignment offsets, current limit thresholds, and PID tuning constants in BLDC driver ICs. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent settings loaded at power-up before closed-loop operation begins. Use Value: Enables field-reprogrammable motor parameters without requiring MCU flash reprogramming or external programming hardware. | Use Scenario: Retaining factory-trimmed gain/offset coefficients and temperature compensation tables for MEMS accelerometers. IC Role / Device Role / Timing Role: Dedicated calibration memory accessed during sensor initialization to correct analog front-end errors. Use Value: Achieves ±0.1% measurement accuracy over temperature without increasing host MCU code size or boot time. |
| Power Supply Sequencing Profiles | Industrial I/O Module Identification |
Use Scenario: Holding multi-rail startup delay values, voltage ramp rates, and fault timeout thresholds in programmable PMICs. IC Role / Device Role / Timing Role: System-level configuration store referenced by power controller state machine during cold-start sequences. Use Value: Allows single-hardware-design support for multiple end-equipment power architectures via software-defined sequencing. | Use Scenario: Storing unique module ID, firmware revision, and channel count metadata in DIN-rail mounted analog input/output cards. IC Role / Device Role / Timing Role: Plug-and-play identification memory read by host PLC CPU during backplane enumeration. Use Value: Eliminates manual dip-switch configuration and enables automatic topology mapping in distributed I/O networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M02-DRMN6TP/K | 2-Mbit SPI interface (4-wire), 5V-only operation (2.5–5.5V), 5 ms write cycle, 400 kHz min clock | Requires SPI master with dedicated CS/SCK/MOSI/MISO lines; not pin-compatible; higher density but less flexible voltage scaling | Select when migrating to SPI-based designs with existing 5V infrastructure and need >4 Kbit capacity |
| 25LC040A-I/P | 4-Kbit SPI EEPROM, 2.5–5.5V operation, 5 ms write cycle, 10 MHz max clock, built-in write protection | Uses SPI protocol instead of three-wire; includes WP pin and software write protection; same density but different command set | Prefer when system already uses SPI peripherals and requires hardware write lockout for safety-critical parameter storage |
Compared with M95M02-DRMN6TP/K and 25LC040A-I/P, the AT93C66B-MAHM-T offers lower pin count, broader voltage range (1.7V min), and simpler three-wire interface - advantageous for space-constrained, multi-voltage, or cost-sensitive industrial control nodes where SPI resources are limited.
Availability
AT93C66B-MAHM-T is available at Aetrix Electronics and suitable for motor control systems, smart sensor modules, programmable power supplies, and industrial I/O equipment requiring stable component supply across extended product lifecycles.
Supply support for AT93C66B-MAHM-T 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 memory products, with ISO 9001-certified manufacturing and global distribution.
The AT93C66B-MAHM-T belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, industrial-grade nonvolatile storage in resource-constrained embedded systems.
FAQ
What is the memory organization of AT93C66B-MAHM-T and how is it configured?
The AT93C66B-MAHM-T provides 4-Kbit capacity in either 512 × 8-bit or 256 × 16-bit configuration. The ORG pin selects organization: tied to VCC enables x16 mode; tied to GND enables x8 mode; left floating defaults to x16 via internal 10 MΩ pull-up. This hardware-selectable mapping eliminates firmware overhead for width adaptation in AT93C66B-MAHM-T implementations.
Does AT93C66B-MAHM-T require external components for reliable operation?
Yes - AT93C66B-MAHM-T requires a 0.1 µF ceramic decoupling capacitor placed within 5 mm of the VCC pin to suppress supply noise during write cycles. No pull-up resistors are needed on CS, SK, or DI; DO is actively driven. The ORG pin may float but must not be left unterminated in noisy environments due to its high-impedance sensitivity.
How does the AT93C66B-MAHM-T handle power-up sequencing?
The AT93C66B-MAHM-T incorporates an internal Power-on Reset (POR) circuit that holds the device in reset until VCC exceeds 1.5 V. After stabilization, the host must wait ≥100 µs before issuing the first command. This prevents spurious writes during voltage ramp-up and ensures AT93C66B-MAHM-T enters standby mode only after valid supply conditions are met.
Can AT93C66B-MAHM-T be used in battery-powered applications with 1.8 V supply?
Yes - AT93C66B-MAHM-T is fully specified for 1.7 V to 5.5 V operation. At 1.8 V, it supports up to 250 kHz clock frequency, maintains full read/write functionality, and draws ≤1.0 µA standby current. This makes AT93C66B-MAHM-T suitable for coin-cell–powered sensors and portable diagnostic tools where ultra-low quiescent power is essential.
What write protection mechanisms does AT93C66B-MAHM-T implement?
AT93C66B-MAHM-T uses instruction-based write protection: all programming (WRITE, ERASE, WRAL, ERAL) requires prior execution of the EWEN (Erase/Write Enable) command. Programming remains enabled until EWDS (Erase/Write Disable) is issued or power is cycled. There is no hardware write-protect pin - protection relies entirely on controlled command sequencing in AT93C66B-MAHM-T firmware.
AT93C66B-MAHM-T 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-T FAQ
1.How can I place an order for AT93C66B-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66B-MAHM-T 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-T reliable?
The price and inventory of AT93C66B-MAHM-T 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-T is usually 5 days.
3.What payment methods are accepted for AT93C66B-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66B-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66B-MAHM-T?
AT93C66B-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66B-MAHM-T 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-T?
For technical support, including AT93C66B-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66B-MAHM-T requirements.
6.How does Aetrix verify that AT93C66B-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT93C66B-MAHM-T 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-T meets industry standards.
7.What is the process for return or replacement of AT93C66B-MAHM-T?
All AT93C66B-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66B-MAHM-T, 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-T part is unused and in its original packaging.
Return procedure for AT93C66B-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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