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Microchip Technology 93AA86B-I/ST
- Part No.:
- 93AA86B-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA86B-I/ST.pdf
- Description:
- IC EEPROM 16KBIT MIC WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,625
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Product details
Overview
93AA86B-I/ST from Microchip Technology is a 16K-bit, 1024 × 16-bit organization serial EEPROM with Microwire-compatible 3-wire interface, operating from 1.8V to 5.5V across -40°C to +85°C industrial temperature range. It features self-timed erase/write cycles (5 ms), 1,000,000 endurance cycles, >200-year data retention, and power-on/off data protection. Used in microcontroller system configuration storage and calibration data logging.
For engineers reviewing the 93AA86B-I/ST datasheet, 93AA86B-I/ST pinout, 93AA86B-I/ST application, or 93AA86B-I/ST equivalent, key selection criteria include voltage range compatibility (1.8–5.5V), 16-bit word organization, TSSOP-8 package footprint, industrial temperature rating, and Microwire protocol timing compliance at up to 3 MHz clock frequency.
Technical Context
This device implements a synchronous serial Microwire interface with dedicated CS, CLK, DI, and DO pins - no ORG or PE pins (as confirmed for 'B' variants). Memory access follows strict instruction-based protocol: READ requires 22 clock cycles; WRITE and ERASE require 14 cycles; ERAL and WRAL are supported but not applicable to 93AA86B due to fixed 16-bit organization and absence of ORG/PE pins.
Internal logic includes automatic erase-before-write, Ready/Busy status reporting via DO pin during programming, and power-on reset circuitry that inhibits operation below 1.5V. Standby current is ≤1 µA with CS low, and read current is ≤1 µA at 2.5V - enabling ultra-low-power embedded use cases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit = 1024 × 16-bit organization - fixed word width; no ORG pin required. |
| VCC Range | 1.8 V to 5.5 V - supports single-supply operation across battery-powered and 3.3V/5V systems. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI mode or quad I/O; minimal pin count. |
| Write Cycle Time | 5 ms max - self-timed; eliminates need for external timing control or polling overhead beyond R/B status. |
| Endurance | 1,000,000 write/erase cycles - validated at 25°C, 5.0V; enables long-term field calibration updates. |
| Data Retention | 200+ years - ensures firmware parameter storage integrity over product lifetime without refresh. |
| Temperature Range | -40°C to +85°C (Industrial grade) - qualified for automotive body electronics and industrial controllers. |
Pinout & Package
8-pin TSSOP package (ST suffix), 3.0 mm × 4.4 mm body, 0.65 mm pitch. Pin 1 marked by laser dot; exposed pad not present (unlike DFN/TDFN variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; forces standby when low. |
| 2 CLK | Serial Clock | Positive-edge synchronized; supports variable clock rate (up to 3 MHz); stop/resume allowed mid-transfer. |
| 3 DI | Data Input | Accepts Start bit, opcode, address (10-bit for 1024-word space), and 16-bit data; no internal pull-up. |
| 4 DO | Data Output / R/B Status | Tri-state output; delivers read data or Ready/Busy signal (low = busy) - requires CS high ≥250 ns to sample. |
| 5 VSS | Ground | Reference return for all signals; must be low-impedance connection to minimize noise coupling. |
| 6 - | Not connected | No internal connection; left floating per datasheet - not ORG or PE (absent on 93AA86B). |
| 7 - | Not connected | No internal connection; left floating - confirms absence of Program Enable functionality. |
| 8 VCC | Power Supply | 1.8–5.5 V input; internal POR circuit triggers at ~1.5 V; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functions down to 1.8 V - enables direct interface with 1.8V/2.5V MCUs without level shifters. |
| Self-timed erase/write | Hardware-managed 5 ms cycle - removes software timing dependencies and simplifies driver code. |
| Ready/Busy status signaling | DO pin doubles as status indicator - allows efficient polling instead of fixed-delay waits. |
| Power-on/off data protection | Internal circuitry blocks writes when VCC < 1.5 V - prevents corruption during brown-out or power ramp. |
| Industry-standard Microwire interface | Compatible with legacy MCU peripherals (e.g., PIC® MSSP in Microwire mode) - no custom IP required. |
Applications
| Motor Control Configuration Storage | Smart Sensor Calibration Data |
|---|---|
Use Scenario: Storing motor commutation tables, PID tuning parameters, and fault history in BLDC motor drives. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime reconfiguration. Use Value: Enables field-upgradable motor profiles without firmware reflashing; retains settings across 10+ year service life. |
Use Scenario: Holding factory-trimmed offset/gain coefficients and temperature compensation curves for MEMS accelerometers. IC Role / Device Role / Timing Role: Calibration data repository read once at power-up and applied to analog front-end. Use Value: Achieves ±0.1% measurement accuracy over full industrial temperature range without host CPU intervention. |
| Industrial PLC I/O Module Settings | Medical Device Safety Parameters |
Use Scenario: Preserving channel scaling factors, alarm thresholds, and communication protocol settings in modular I/O bases. IC Role / Device Role / Timing Role: Persistent parameter store accessed via isolated UART-to-Microwire bridge. Use Value: Survives 100,000+ hot-swap cycles and maintains configuration integrity during 20 ms power interruptions. |
Use Scenario: Securing critical safety limits (e.g., maximum infusion rate, pressure cutoffs) in infusion pumps and ventilators. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault verified at startup and during runtime checks. Use Value: Meets IEC 62304 Class C requirements via hardware-level write-protection and 200-year retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC86B-I/ST | Same 1024×16-bit organization, but 2.5–5.5V VCC range - lacks 1.8V support. | Not suitable for 1.8V systems; otherwise pin- and function-compatible. | Select 93LC86B-I/ST only if system VCC ≥2.5V and 1.8V operation is unnecessary. |
| AT25128B-SSHL-T | SPI interface (4-wire), 128 Kbit capacity, 1.8–5.5V, 20 MHz clock - higher speed, larger memory. | Requires SPI peripheral and additional CS line; incompatible protocol stack. | Choose AT25128B-SSHL-T when >16 Kbit capacity or faster access (>3 MHz) is required. |
Compared with 93AA86B-I/ST, 93LC86B-I/ST offers identical functionality at higher minimum voltage, while AT25128B-SSHL-T provides greater density and speed at the cost of interface compatibility and increased pin count.
Availability
93AA86B-I/ST is available at Aetrix Electronics and suitable for motor control configuration storage, smart sensor calibration data, and industrial PLC I/O module settings requiring stable component supply across extended production lifecycles.
Supply support for 93AA86B-I/ST 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 microcontrollers, analog devices, and nonvolatile memory solutions, headquartered in Chandler, Arizona.
The 93XX86 series was designed specifically for low-power, space-constrained embedded systems requiring reliable, low-voltage serial EEPROM with Microwire compatibility and industrial-grade reliability.
FAQ
What is the memory organization of the 93AA86B-I/ST?
The 93AA86B-I/ST has a fixed 1024 × 16-bit organization - meaning it stores 1024 words of 16 bits each, totaling 16 Kbits. Unlike the 'C' variants, it does not feature an ORG pin and therefore cannot be configured for 8-bit operation. This fixed x16 structure simplifies address decoding in 16-bit data path systems.
Does the 93AA86B-I/ST support 1.8V operation?
Yes, the 93AA86B-I/ST operates across a VCC range of 1.8 V to 5.5 V, making it compatible with modern low-voltage microcontrollers and battery-powered devices. Its power-on reset circuit activates at approximately 1.5 V, ensuring robust initialization even during gradual power ramp-up.
Is the 93AA86B-I/ST pin-compatible with other 93XX86 variants in TSSOP-8?
Yes - the 93AA86B-I/ST shares identical pinout and footprint with all 93XX86A/B/C devices in TSSOP-8 (ST) package. However, functional compatibility depends on variant: 93AA86B lacks ORG and PE pins, so those pins (6 and 7) are NC and must remain unconnected - unlike 93AA86C where they are active.
What is the maximum clock frequency supported by the 93AA86B-I/ST?
The 93AA86B-I/ST supports up to 3 MHz clock frequency when VCC is 4.5 V to 5.5 V. At lower voltages, the maximum clock rate reduces: 2 MHz for 2.5 V ≤ VCC < 4.5 V, and 1 MHz for 1.8 V ≤ VCC < 2.5 V. These limits ensure reliable setup/hold timing across voltage and temperature ranges.
How is write protection implemented on the 93AA86B-I/ST?
The 93AA86B-I/ST does not include hardware write protection via a PE pin - that feature is exclusive to 'C' variants. Instead, it relies on the EWEN/EWDS instruction sequence: the device powers up in EWDS (write-disabled) mode, and an explicit EWEN command must precede any ERASE or WRITE operation. This provides software-controlled protection without external components.
93AA86B-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 16Kbit
- Memory Organization:
- 1K x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 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-TSSOP
93AA86B-I/ST FAQ
1.How can I place an order for 93AA86B-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA86B-I/ST 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 93AA86B-I/ST reliable?
The price and inventory of 93AA86B-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA86B-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA86B-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA86B-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA86B-I/ST?
93AA86B-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA86B-I/ST 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 93AA86B-I/ST?
For technical support, including 93AA86B-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA86B-I/ST requirements.
6.How does Aetrix verify that 93AA86B-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA86B-I/ST 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 93AA86B-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA86B-I/ST?
All 93AA86B-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA86B-I/ST, 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 93AA86B-I/ST part is unused and in its original packaging.
Return procedure for 93AA86B-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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