My Inquiry
My Account
Microchip Technology AT93C66B-SSHM-T
- Part No.:
- AT93C66B-SSHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66B-SSHM-T.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,236
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT93C66B-SSHM-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 with industrial temperature range (−40°C to +85°C), 2 MHz max clock rate at 5V, and self-timed write cycle ≤5 ms. It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-voltage operation and space-constrained PCB layouts.
For engineers reviewing the AT93C66B-SSHM-T datasheet, AT93C66B-SSHM-T pinout, AT93C66B-SSHM-T application, or AT93C66B-SSHM-T equivalent, key selection considerations include voltage compatibility (1.7–5.5V), organization selectability via ORG pin, industrial-grade reliability (1M write cycles, 100-year data retention), and SOIC-8 package footprint compatibility with legacy designs.
Technical Context
The AT93C66B-SSHM-T implements a synchronous three-wire serial interface (CS/SK/DI/DO) with instruction-based command set (READ, WRITE, ERASE, EWEN/EWDS, WRAL/ERAL). Its internal architecture includes address register, row/column decoders, high-voltage generation for EEPROM programming, and power-on reset circuitry ensuring safe initialization.
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 sequential read, status polling via DO pin, and write-all/erase-all-are fully compliant with the defined AC timing parameters across 1.7–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 4,096 bits (512 × 8 or 256 × 16), enabling compact firmware parameter or calibration data storage without external address latches |
| Supply Voltage Range | 1.7V to 5.5V - supports direct interfacing with 1.8V, 2.5V, 3.3V, and 5V logic domains without level shifters |
| Max Clock Frequency | 2 MHz at 4.5–5.5V - delivers up to 256 KB/s effective serial throughput in x8 mode for rapid configuration loading |
| Write Cycle Time | ≤5 ms maximum - enables deterministic firmware update latency and simplifies host-side timeout handling |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C - meets long-life requirements for industrial control and automotive subsystems |
| Operating Temperature | −40°C to +85°C - qualified for deployment in extended-temperature embedded applications including motor drives and sensor nodes |
| Package Type | 8-lead SOIC (3.9 mm body) - industry-standard footprint compatible with automated assembly and legacy board layouts |
Pinout & Package
AT93C66B-SSHM-T is supplied in an 8-lead SOIC package (3.90 mm body width, JEDEC MS-012AC), with gull-wing leads, RoHS-compliant lead finish, and moisture sensitivity level (MSL) 1. Pin 1 is marked by a beveled corner or dot.
| 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, enabling bus sharing |
| SK | Serial Data Clock | Rising-edge synchronized interface: all input data latched and output data shifted on SK rising edge per Microchip timing spec |
| DI | Serial Data Input | Receives instruction opcodes, addresses, and write data; requires setup/hold timing compliance per VCC voltage grade |
| DO | Serial Data Output | Outputs read data or Ready/Busy status (logic '1' = ready, '0' = busy) when CS is asserted post-write/erase initiation |
| GND | Ground Reference | System ground return path; must be low-impedance connection to minimize noise coupling into EEPROM core |
| ORG | Organization Select | Hardware-configurable memory width: VCC = x16, GND = x8, floating = x16 (10 MΩ internal pull-up) |
| NC | No Connect | Pin 7 is internally unused and must remain unconnected; no routing or termination required |
| VCC | Power Supply | Single-supply input (1.7–5.5V); includes internal POR circuit with 100 µs tPUP delay before first command acceptance |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configured x8/x16 mode via ORG pin eliminates software configuration overhead and ensures deterministic addressing |
| Self-timed write cycle | No external timing control needed; host polls DO pin for completion, removing need for fixed delays or complex state machines |
| Sequential read capability | Continuous data stream without inter-byte dummy bits once CS remains high, reducing host SPI-like transaction overhead |
| Industrial-grade reliability | 1M write cycles and 100-year data retention validated per JEDEC JESD22-A117, supporting 10+ year field deployments |
| Green packaging | Lead-free, halide-free, RoHS-compliant SOIC package with MSL1 rating - suitable for lead-free reflow and global environmental compliance |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
|
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 storage accessed during system boot; reads occur once per power cycle with <50 µs latency. Use Value: Enables field-replaceable sensor modules without firmware updates; x16 mode reduces address bus width in microcontroller GPIO-constrained designs. |
Use Scenario: Retaining user preferences (temperature setpoints, timer values, display brightness) across power loss in smart refrigerators and washing machines. IC Role / Device Role / Timing Role: Low-power standby storage; writes occur infrequently (<10×/day) and are protected by EWEN/EWDS sequence. Use Value: 1.7V operation allows direct connection to battery-backed 1.8V rails; 100-year retention ensures data integrity over product lifetime. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
|
Use Scenario: Saving door lock/unlock patterns, mirror position memory, and lighting profiles in 12V automotive body control units with wide input voltage transients. IC Role / Device Role / Timing Role: Robust configuration store interfaced to 5V MCU; withstands load-dump events via 6.25V absolute max VCC rating. Use Value: −40°C to +85°C operation covers under-hood thermal extremes; SOIC package supports AEC-Q200-compatible board-level qualification. |
Use Scenario: Storing calibration constants, usage logs, and regulatory audit trails in portable ultrasound and ECG devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Secure parameter archive with write-protection via EWDS; sequential read supports fast boot-time calibration loading. Use Value: 250 kHz min clock at 1.7V enables reliable communication during brown-out conditions; RoHS/halide-free construction meets IEC 60601-1 medical safety standards. |
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 EEPROM (vs. 4-Kbit), quad I/O support, 20 MHz max clock, 1.7–5.5V, SOIC-8 | Higher density and faster interface; requires SPI controller with quad mode support | Select when >4 Kbit capacity or higher throughput is required; not drop-in due to command set and timing differences |
| 25AA040A-I/P | 4-Kbit SPI EEPROM, 10 MHz max clock at 5V, 1.8–5.5V, 8-lead PDIP/SOIC, no ORG pin | Fixed x8 organization; lacks hardware organization select; uses standard SPI mode 0/3 | Choose for simpler SPI integration where x16 mode is unnecessary; pin-compatible but functionally limited vs. AT93C66B-SSHM-T |
Compared with M95M04-DRMN6TP/K and 25AA040A-I/P, the AT93C66B-SSHM-T uniquely offers hardware-selectable x8/x16 organization in a three-wire interface, making it optimal for resource-constrained MCUs lacking dedicated SPI peripherals or requiring flexible memory width without firmware overhead.
Availability
AT93C66B-SSHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AT93C66B-SSHM-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 solutions, with ISO 9001-certified manufacturing and global distribution.
The AT93C66B-SSHM-T belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal external components and broad voltage compatibility.
FAQ
What is the memory organization of AT93C66B-SSHM-T and how is it selected?
The AT93C66B-SSHM-T supports dual memory organizations: 512 × 8 or 256 × 16 bits. Selection is hardware-controlled via the ORG pin - tie to VCC for x16 mode, to GND for x8 mode, or leave floating (internal 10 MΩ pull-up defaults to x16). This eliminates software configuration and ensures deterministic addressing at power-on. The AT93C66B-SSHM-T datasheet confirms this behavior in Section 2.6 and Figure 3-1.
Does AT93C66B-SSHM-T support sequential read operations?
Yes, the AT93C66B-SSHM-T supports sequential read: after issuing a READ command and address, holding CS high causes automatic address increment and continuous data output on DO without inter-byte dummy bits. This reduces host transaction overhead and accelerates bulk reads. The AT93C66B-SSHM-T electrical characteristics table (Section 4.5) and timing diagram Figure 5-1 validate this behavior.
What is the maximum write cycle time for AT93C66B-SSHM-T and how is completion signaled?
The AT93C66B-SSHM-T has a maximum write cycle time of 5 ms across its full 1.7–5.5V operating range. Completion is signaled via the DO pin: when CS is brought high after initiating a write, DO outputs logic '0' during busy state and transitions to logic '1' when complete. This Ready/Busy polling mechanism is documented in Section 5.5 and Figure 5-5 of the AT93C66B-SSHM-T datasheet.
Is AT93C66B-SSHM-T compatible with 1.8V microcontroller I/O interfaces?
Yes, the AT93C66B-SSHM-T operates down to 1.7V and specifies DC input thresholds (VIL2, VIH2) and AC timing (250 kHz min clock) explicitly for 1.7–2.5V VCC range. Its input leakage current (≤3.0 µA) and output drive strength (VOH2 = VCC − 0.2V at 100 µA) ensure robust interoperability with 1.8V logic families. These parameters are verified in Tables 4-2 and 4-3 of the AT93C66B-SSHM-T datasheet.
What package type is used for AT93C66B-SSHM-T and what are its key mechanical features?
The AT93C66B-SSHM-T uses an 8-lead SOIC package (3.90 mm body width, JEDEC MS-012AC), with gull-wing leads, RoHS-compliant matte tin finish, and MSL1 rating. Key dimensions include 1.27 mm pitch, 6.00 mm overall width (E1), and 4.90 mm overall length (D). Package drawings and land patterns are specified in Microchip Drawing C04-057-SN Rev E, referenced in the AT93C66B-SSHM-T packaging section.
AT93C66B-SSHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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-SOIC
AT93C66B-SSHM-T FAQ
1.How can I place an order for AT93C66B-SSHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66B-SSHM-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-SSHM-T reliable?
The price and inventory of AT93C66B-SSHM-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-SSHM-T is usually 5 days.
3.What payment methods are accepted for AT93C66B-SSHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66B-SSHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66B-SSHM-T?
AT93C66B-SSHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66B-SSHM-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-SSHM-T?
For technical support, including AT93C66B-SSHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66B-SSHM-T requirements.
6.How does Aetrix verify that AT93C66B-SSHM-T is sourced from the original manufacturer or authorized distributors?
All AT93C66B-SSHM-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-SSHM-T meets industry standards.
7.What is the process for return or replacement of AT93C66B-SSHM-T?
All AT93C66B-SSHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66B-SSHM-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-SSHM-T part is unused and in its original packaging.
Return procedure for AT93C66B-SSHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT93C66B-SSHM-T Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
