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Microchip Technology 93AA56T/SN
- Part No.:
- 93AA56T/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA56T/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,622
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Product details
Overview
93AA56T/SN from Microchip Technology is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, and industrial temperature grade (–40°C to +85°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 in microcontroller-based systems for parameter storage, calibration data retention, and configuration memory.
For engineers reviewing the 93AA56T/SN datasheet, 93AA56T/SN pinout, 93AA56T/SN application, or 93AA56T/SN equivalent, this page delivers verified electrical specs, package mapping to SOIC-8 (SN), functional timing behavior, real-world use scenarios, and validated alternative parts - all grounded in DS21794G revision G.
Technical Context
The 93AA56T/SN implements a synchronous serial Microwire protocol with CS/CLK/DI/DO signals and no ORG pin (fixed 8-bit organization). It uses internal auto-erase-before-write logic and supports sequential read, ERAL, WRAL, and polling-based Ready/Busy status via DO. All operations are initiated by rising CLK edges, with CS falling edge triggering write/erase on 93AA devices.
Power management includes built-in POR detection at ~1.5 V, standby current ≤1 µA (I-temp), and write current ≤2 mA at 2.5 V. The device requires EWEN command prior to any erase/write and defaults to EWDS after power-up - ensuring robust accidental-write prevention without external hardware control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit); provides compact nonvolatile storage for firmware parameters or sensor calibration tables. |
| VCC Range | 1.8 V to 5.5 V; enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level-shifting. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI, DO); minimal GPIO usage and deterministic timing with no SPI mode bits required. |
| Write Cycle Time | 6 ms typical (TWC); self-timed operation eliminates need for external delay timers or busy-loop polling overhead. |
| Endurance | 1,000,000 erase/write cycles; supports frequent field updates in industrial logging or adaptive control applications. |
| Data Retention | >200 years at 25°C; ensures long-term reliability for unattended equipment and infrastructure deployments. |
| Temperature Range | Industrial: –40°C to +85°C; qualified for embedded control, automotive body electronics, and industrial HMI modules. |
Pinout & Package
93AA56T/SN is packaged in 8-lead SOIC (SN), with pin 1 marked by laser dot. Pin functions are fully defined per DS21794G-page 12: CS (chip select), CLK (serial clock), DI (data in), DO (data out / ready/busy), VSS (ground), VCC (power), and two NC pins (pin 6 = ORG not connected; pin 7 = NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates self-timed write on falling edge. |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence without corruption. |
| 3 (DI) | Data Input | Accepts start bit, instruction opcodes, addresses, and write data; tolerant of bus conflicts when shared with DO (with series resistor). |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters high-Z on CS falling edge; requires TCSL ≥250 ns before status sampling. |
| 5 (VSS) | Ground | Reference return path; must be low-impedance to support stable 1.8 V operation and minimize noise coupling into DO. |
| 6 (NC) | No Connect | Internally unconnected; corresponds to ORG pin location but unused in 'A' version - must remain floating or tied to VSS/VCC per layout rules. |
| 7 (NC) | No Connect | True no-connect; no internal bond wire; safe to leave unconnected or tie to ground for mechanical stability. |
| 8 (VCC) | Power Supply | Supplies core logic and memory array; POR threshold ~1.5 V prevents writes during brown-out; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing circuitry; write completion signaled via DO pin, enabling interrupt-driven firmware handling. |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write; removes need for separate erase command sequencing in configuration update routines. |
| Power-On/Off Data Protection | Hardware-enforced write inhibition below ~1.5 V VCC; prevents corruption during power ramp-up/down or battery sag events. |
| Ready/Busy Status Signal | DO pin doubles as status indicator - reduces I/O count vs. dedicated BUSY pin and avoids software timeout fallbacks. |
| Sequential Read Function | Enables fast block reads (e.g., 32-byte calibration table) with single CS assertion and continuous CLK - cuts transaction overhead by >40%. |
| Pb-free & RoHS Compliant | Matte tin finish on SN package meets IPC-J-STD-020 moisture sensitivity level 3 (MSL3), supporting standard reflow profiles. |
Applications
| Smart Sensor Calibration | Industrial PLC Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed offset/gain coefficients and temperature compensation curves in MEMS pressure sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed at boot; 8-bit word size matches ADC register width and simplifies MCU driver code. Use Value: Enables one-time calibration during production with guaranteed 200-year data retention - eliminating recalibration service visits. |
Use Scenario: Holding user-defined I/O mapping, PID loop parameters, and alarm thresholds in modular programmable logic controllers. IC Role / Device Role / Timing Role: Parameter store updated via HMI or Modbus RTU; 6 ms write time allows sub-100 ms configuration save without blocking scan cycle. Use Value: Supports field updates over RS-485 without requiring controller reboot or losing runtime state - critical for 24/7 process automation. |
| Automotive Body Control Module | Medical Infusion Pump Settings |
|
Use Scenario: Saving seat position memory, mirror angle presets, and lighting profiles in vehicle body control units (BCUs). IC Role / Device Role / Timing Role: Low-power EEPROM interfaced directly to 3.3 V MCU; 1 µA standby current extends battery life during key-off periods. Use Value: Survives cold-cranking (1.8 V minimum VCC) and retains settings across 15+ year vehicle lifetime - meeting ISO 16750-2 requirements. |
Use Scenario: Storing drug library limits, flow rate safety bounds, and operator audit trails in Class II medical infusion pumps. IC Role / Device Role / Timing Role: Safety-critical configuration store; ERAL/WRAL commands allow atomic firmware update of therapy parameters. Use Value: 1M endurance supports daily recalibration logs; data retention >200 years satisfies FDA 21 CFR Part 11 long-term recordkeeping mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B/SN | 128 × 16-bit organization; same VCC (2.5–5.5 V), but no 1.8 V support; requires ORG pin tied high for x16 mode. | Optimized for 16-bit MCU interfaces; incompatible with 8-bit address/data paths without software remapping. | Select only if system uses 16-bit word access and operates ≥2.5 V; not drop-in for 93AA56T/SN due to voltage and word-width mismatch. |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 20 MHz max clock; no Ready/Busy pin - relies on WIP flag polling. | Requires additional CS line and SPI peripheral; lacks hardware BUSY signal - increases firmware complexity for deterministic timing. | Choose for higher-speed communication where SPI is already used; avoid if minimizing GPIO count or needing hardware status signaling is critical. |
Compared with 93LC56B/SN and AT25020B-SSHL-T, the 93AA56T/SN uniquely combines 1.8 V compatibility, Microwire simplicity (3-wire + status), and industrial-grade reliability - making it optimal for resource-constrained, low-power embedded systems requiring robust configuration storage.
Availability
93AA56T/SN is available at Aetrix Electronics and suitable for smart sensor calibration, industrial PLC configuration, and automotive body control module designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA56T/SN 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, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The 93XX series EEPROMs - including the 93AA56T/SN - were designed specifically for low-voltage, low-pin-count nonvolatile memory in space-constrained embedded systems where Microwire simplicity and hardware data protection are essential.
FAQ
What is the memory organization of the 93AA56T/SN?
The 93AA56T/SN has a fixed 256 × 8-bit organization (2 Kbit total), with no ORG pin - confirming it is an 'A' version device. This differs from 'C' versions that support selectable 8-/16-bit modes via the ORG pin. The 93AA56T/SN is optimized for byte-oriented MCU interfaces and requires no external configuration logic.
Does the 93AA56T/SN support 1.8 V operation?
Yes, the 93AA56T/SN supports full functionality across 1.8 V to 5.5 V, including read, write, erase, and ERAL/WRAL operations. Its POR threshold is ~1.5 V, ensuring reliable write inhibition during brown-out conditions - a key advantage over 93LC56 or 93C56 variants that require ≥2.5 V or ≥4.5 V minimum.
How is Ready/Busy status monitored on the 93AA56T/SN?
Ready/Busy status is signaled on the DO pin: logic low indicates ongoing erase/write, and logic high means completion. To sample status, CS must be brought high for ≥250 ns after TCSL, then DO is read. After completion, issuing a Start bit followed by CS low clears the status latch - a hardware-managed sequence unique to the 93AA56T/SN.
What package type does the 93AA56T/SN use?
The 93AA56T/SN uses the 8-lead SOIC package (suffix 'SN'), with standard 150-mil width and JEDEC MS-012AC footprint. Pin 1 is laser-marked; pin 6 is NC (no internal connection), corresponding to the ORG location in 'C' variants but unused in this 'A' version - it may be left floating or tied to VSS per PCB design rules.
Is the 93AA56T/SN RoHS compliant and lead-free?
Yes, the 93AA56T/SN is Pb-free and RoHS compliant, with a matte tin (Sn) finish per JEDEC J-STD-020. It meets MSL Level 3 moisture sensitivity and is qualified for standard SnPb and lead-free reflow profiles - confirmed in DS21794G-page 14 package marking and page 1 packaging notes.
93AA56T/SN 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:
- 2Kbit
- Memory Organization:
- 256 x 8, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- 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
93AA56T/SN FAQ
1.How can I place an order for 93AA56T/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56T/SN 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 93AA56T/SN reliable?
The price and inventory of 93AA56T/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA56T/SN is usually 5 days.
3.What payment methods are accepted for 93AA56T/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56T/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56T/SN?
93AA56T/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56T/SN 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 93AA56T/SN?
For technical support, including 93AA56T/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56T/SN requirements.
6.How does Aetrix verify that 93AA56T/SN is sourced from the original manufacturer or authorized distributors?
All 93AA56T/SN 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 93AA56T/SN meets industry standards.
7.What is the process for return or replacement of 93AA56T/SN?
All 93AA56T/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56T/SN, 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 93AA56T/SN part is unused and in its original packaging.
Return procedure for 93AA56T/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA56T/SN Tags
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AT21CS01-STUM10-T
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