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Microchip Technology AT93C46D-TH-B
- Part No.:
- AT93C46D-TH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT93C46D-TH-B.pdf
- Description:
- IC EEPROM 1KBIT 3-WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,074
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Product details
Overview
AT93C46D-TH-B from Microchip Technology is a 1-Kbit three-wire serial EEPROM with user-selectable memory organization (128 × 8 or 64 × 16), operating from 1.8V to 5.5V, rated for -40°C to +85°C, and featuring 1,000,000 write cycles and 100-year data retention. It serves as nonvolatile configuration storage in industrial control modules, power supply supervisors, and embedded sensor nodes.
For engineers reviewing the AT93C46D-TH-B datasheet, AT93C46D-TH-B pinout, AT93C46D-TH-B application, or AT93C46D-TH-B equivalent, key selection considerations include ORG-pin–enabled x8/x16 reconfiguration, 2 MHz max clock at 5V, self-timed 5 ms write cycle, industrial temperature compliance, and compatibility with space-constrained 8-lead TSSOP packaging.
Technical Context
The AT93C46D-TH-B implements a synchronous three-wire interface (CS/SK/DI/DO) with rising-edge clocking and supports seven command instructions including READ, WRITE, ERASE, EWEN, EWDS, WRAL, and ERAL. Its internal organization is dynamically selected via the ORG pin-tied to VCC for 64 × 16 mode or GND for 128 × 8 mode.
It integrates on-chip high-voltage generation for EEPROM programming, a power-on reset (POR) circuit with 1.5 V threshold, and automatic Ready/Busy status reporting via DO when CS is asserted post-write. The device requires no external erase cycle and enforces write protection through explicit EWEN/EWDS command sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1,024 bits (128 × 8 or 64 × 16 configurable) |
| Supply voltage | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 2.7 V, and 5 V logic domains |
| Max clock frequency | 2 MHz at 4.5–5.5 V - supports fast configuration reads in time-critical boot sequences |
| Write cycle time | ≤ 5 ms - guarantees deterministic firmware update latency without polling overhead |
| Endurance | 1,000,000 write cycles - suitable for dynamic parameter logging in field-deployed equipment |
| Data retention | 100 years at 55 °C - ensures long-term calibration data integrity across product lifecycle |
| Operating temperature | -40 °C to +85 °C - validated for industrial ambient environments without derating |
Pinout & Package
AT93C46D-TH-B is supplied in an 8-lead TSSOP package (3.0 mm × 4.4 mm body, 0.65 mm pitch). Pin 1 is marked by a beveled corner; the exposed pad is not electrically connected and may be left floating or grounded for thermal enhancement.
| 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 sampling and DO output occur on SK rising edge |
| DI | Serial Data Input | Accepts instruction opcodes, addresses, and write data; latched on SK rising edge |
| DO | Serial Data Output | Outputs read data or Ready/Busy status (logic '1' = ready, '0' = busy) when CS is asserted post-write |
| GND | Ground reference | System return path for VCC and all I/O; must be low-impedance connection to minimize noise coupling |
| ORG | Internal Organization select | Connect to VCC for 64 × 16 mode, GND for 128 × 8 mode; unconnected defaults to x16 via internal 1 MΩ pull-up |
| NC | No Connect | Pin 7 is internally unused and must remain unconnected per design - no routing or termination required |
| VCC | Power supply | Single-supply input supporting 1.8–5.5 V; includes POR circuit triggered at ~1.5 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable x8 or x16 word width via ORG pin - eliminates need for software remapping or address translation |
| Self-timed write cycle | Internal timing engine completes erase/write within ≤5 ms - removes requirement for external delay timers or status polling loops |
| Three-wire serial interface | Minimal pin count (CS/SK/DI/DO) with no chip-enable or write-protect pins needed - reduces PCB routing complexity and BOM cost |
| Industrial-grade reliability | 1M write cycles and 100-year data retention validated at 55 °C - meets long-life requirements for infrastructure and medical devices |
| Low-voltage operation | Full functionality down to 1.8 V - enables direct integration with ultra-low-power microcontrollers and battery-backed systems |
Applications
| Industrial Sensor Calibration Storage | Embedded Power Supply Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed offset/gain coefficients and temperature compensation tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding calibration constants accessed during system startup and runtime recalibration. Use Value: Enables field-replaceable sensor modules without firmware reflash; ORG pin allows same hardware to support 8-bit or 16-bit coefficient formats. |
Use Scenario: Retaining user-defined voltage/current limits, soft-start profiles, and fault recovery settings in digitally controlled DC-DC modules. IC Role / Device Role / Timing Role: Persistent parameter store queried at power-on to initialize digital PWM controller registers and protection thresholds. Use Value: Eliminates need for external MCU-based configuration management; 2 MHz SPI-compatible speed ensures sub-millisecond boot initialization. |
| Consumer Appliance User Preference Memory | Automotive Body Control Module Settings |
|
Use Scenario: Saving user-selected display brightness, timer presets, and language preferences in smart home appliances across power cycles. IC Role / Device Role / Timing Role: Low-power nonvolatile memory accessed infrequently but requiring guaranteed data integrity over 10+ years of operation. Use Value: 100-year data retention at 55 °C exceeds appliance lifetime expectations; 1.8 V operation supports energy-harvesting backup power schemes. |
Use Scenario: Storing seat position memory, mirror fold/unfold profiles, and lighting dimming curves in automotive body control units (BCUs). IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfaced directly to 5 V CAN/LIN microcontroller GPIOs for robust parameter persistence. Use Value: Industrial temperature range (-40 °C to +85 °C) and AEC-Q200–compatible packaging ensure reliability under hood and cabin thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95128-DFMN6TP/K | 4-wire SPI interface (no ORG pin); fixed 128 × 8 organization; 5 MHz max clock at 5 V | Lacks hardware-configurable word width; requires SPI master instead of generic GPIO bit-banging | Select when higher throughput is needed and x16 mode is unnecessary; verify layout supports 5 V SPI level compatibility |
| 25AA010A-I/P | 3-wire UNI/O® interface (single-data-line); 1 Kbit fixed 128 × 8; 100 kHz max clock; 1.8–5.5 V | Reduced pin count (3-pin total) but slower interface; no ORG or x16 support; proprietary protocol | Choose for ultra-minimal footprint where pin count is critical and write frequency is low; requires UNI/O host driver stack |
Compared with M95128-DFMN6TP/K and 25AA010A-I/P, AT93C46D-TH-B uniquely provides hardware-selectable memory organization and full three-wire compatibility with generic GPIO-controlled masters, making it optimal for cost-sensitive industrial designs requiring flexible data width without protocol lock-in.
Availability
AT93C46D-TH-B is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded power supply configuration, and consumer appliance user preference memory requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AT93C46D-TH-B 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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.
AT93C46D-TH-B belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, and industrial-temperature nonvolatile storage in resource-constrained embedded systems.
FAQ
What memory organization options does the AT93C46D-TH-B support?
The AT93C46D-TH-B supports two memory organizations: 128 words × 8 bits or 64 words × 16 bits. Selection is made externally via the ORG pin-tied to VCC for x16 mode or GND for x8 mode. This hardware-level configurability eliminates firmware changes when adapting to different data-width requirements, and AT93C46D-TH-B retains full functionality in either mode across its 1.8–5.5 V supply range.
How does the AT93C46D-TH-B handle write protection?
The AT93C46D-TH-B uses command-based write protection: the Erase/Write Enable (EWEN) instruction must be issued before any WRITE, ERASE, WRAL, or ERAL operation, and Erase/Write Disable (EWDS) terminates the enabled state. No hardware write-protect pin is present. This ensures intentional writes only, and AT93C46D-TH-B remains immune to spurious writes during power transients or noise events unless both EWEN and valid command sequences are correctly executed.
Can the AT93C46D-TH-B operate reliably at 1.8 V?
Yes, AT93C46D-TH-B is fully specified for 1.8 V operation, including read, write, and erase functions. At 1.8 V, maximum clock frequency is 250 kHz, standby current is ≤1.0 μA, and write cycle time remains ≤5 ms. Its 1.8 V capability enables direct use with ultra-low-power MCUs and battery-powered systems, and AT93C46D-TH-B maintains full industrial temperature range (-40°C to +85°C) performance at this voltage.
What is the function of the NC pin on the AT93C46D-TH-B?
Pin 7 on AT93C46D-TH-B is designated NC (No Connect) and is internally unconnected. It must not be bonded, routed, or terminated on the PCB. Unlike the ORG pin (pin 6), which actively selects memory organization, the NC pin has zero electrical function. Leaving it floating is mandatory; connecting it to VCC, GND, or any signal violates the AT93C46D-TH-B datasheet and may cause undefined behavior or reduced reliability.
Does the AT93C46D-TH-B require an external pull-up resistor on the DO pin?
No, AT93C46D-TH-B features an internally weak-pullup-enabled DO output that drives high or low actively during read or status reporting. External pull-ups are unnecessary and discouraged, as they may interfere with the DO pin's ability to enter high-impedance state when CS is low or during Ready/Busy transitions. The AT93C46D-TH-B specification confirms DO operates as a standard CMOS push-pull output with VOL ≤ 0.4 V and VOH ≥ 2.4 V at 5 V, and no external biasing is required.
AT93C46D-TH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8, 64 x 16
- Memory Interface:
- 3-Wire Serial
- Clock Frequency:
- 2 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
AT93C46D-TH-B FAQ
1.How can I place an order for AT93C46D-TH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C46D-TH-B 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 AT93C46D-TH-B reliable?
The price and inventory of AT93C46D-TH-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C46D-TH-B is usually 5 days.
3.What payment methods are accepted for AT93C46D-TH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C46D-TH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C46D-TH-B?
AT93C46D-TH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C46D-TH-B 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 AT93C46D-TH-B?
For technical support, including AT93C46D-TH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C46D-TH-B requirements.
6.How does Aetrix verify that AT93C46D-TH-B is sourced from the original manufacturer or authorized distributors?
All AT93C46D-TH-B 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 AT93C46D-TH-B meets industry standards.
7.What is the process for return or replacement of AT93C46D-TH-B?
All AT93C46D-TH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT93C46D-TH-B, 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 AT93C46D-TH-B part is unused and in its original packaging.
Return procedure for AT93C46D-TH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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