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Microchip Technology 93C46BT/ST
- Part No.:
- 93C46BT/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C46BT/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,946
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Product details
Overview
93C46BT/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature grade (–40°C to +85°C). It features self-timed erase/write cycles, automatic erase-all-before-write-all (ERAL/WRAL), and Ready/Busy status signaling via DO pin. Used for configuration storage in embedded controllers and power management systems.
For engineers reviewing the 93C46BT/ST datasheet, 93C46BT/ST pinout, 93C46BT/ST application, or 93C46BT/ST equivalent, this page delivers verified electrical specs, package mapping to SOIC-8 (ST), functional timing behavior, and real-world selection guidance for nonvolatile memory replacement in legacy industrial designs.
Technical Context
The 93C46BT/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (dedicated x8 organization). Its internal architecture includes auto-erase-before-write logic, EWEN/EWDS write protection, and power-on data protection triggered at VCC ≥ 3.8 V. All programming operations are initiated by CLK rising edge on final data bit (93C-series behavior).
It supports sequential read, ERASE (per-address), ERAL (full array), WRITE, and WRAL (full-array write with built-in ERAL). Timing-critical parameters include TWC = 2 ms write cycle time, TCSL = 250 ns minimum CS low time, and TPD ≤ 400 ns data output delay at 1.8–5.5 V - all validated for industrial temperature operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin; suitable for byte-oriented configuration storage. |
| VCC range | 4.5 V to 5.5 V - requires stable 5 V rail; POR threshold at 3.8 V ensures data integrity during brown-out. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no I²C or SPI; minimal GPIO footprint. |
| Write endurance | 1,000,000 erase/write cycles - validated at 25°C, 5.0 V; enables long-term field calibration storage. |
| Data retention | 200 years at 85°C - specified for industrial temp grade; exceeds typical product lifecycle requirements. |
| Timing (TWC) | 2 ms max erase/write cycle - deterministic latency; eliminates need for polling overhead in time-critical firmware. |
| Operating temp | –40°C to +85°C (Industrial grade) - qualified for factory automation, motor drives, and HVAC control units. |
Pinout & Package
93C46BT/ST is packaged in 8-lead SOIC (ST suffix), with standard pinout matching industry Microwire EEPROMs. Pin functions are electrically and mechanically defined per Microchip DS20001749K.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls Standby entry and Ready/Busy sampling window. |
| 2 CLK | Serial Clock | Rising-edge synchronized I/O; stops/resumes freely; initiates 93C-series write cycle on final data bit's rising edge. |
| 3 DI | Data Input | Accepts Start bit, opcode, address, and data; tied to DO only with series resistor to prevent bus conflict during dummy-zero read phase. |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires CS high ≥250 ns to sample status. |
| 5 VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to avoid timing skew or corruption. |
| 6 NC | No Connect | Internally unconnected; must remain floating - not tied to VSS/VCC or used as strap pin. |
| 7 NC | No Connect | Same as Pin 6; unused in 93C46A/B variants; no internal function or test access. |
| 8 VCC | Power Supply | 4.5–5.5 V only; voltage detect circuit disables writes below 3.8 V; decoupling capacitor mandatory near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control; 2 ms max cycle (93C variant) enables predictable firmware state-machine design. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; removes need for separate ERAL command in boot-loader sequences. |
| Power-on/off data protection | Hardware lockout below 3.8 V prevents partial writes during power ramp; no software initialization required. |
| Ready/Busy status on DO | Enables efficient polling without extra GPIO; DO low = active programming; high = ready for next instruction. |
| EWEN/EWDS write protection | Prevents accidental overwrites; device powers up in EWDS mode; explicit EWEN required before any write/erase. |
Applications
| Industrial Motor Control | Legacy Embedded Controller |
|---|---|
|
Use Scenario: Storing calibrated PWM offset values and fault-history counters in AC drive inverters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during startup and runtime diagnostics. Use Value: 200-year data retention ensures calibration survives 15+ year equipment lifespans without backup battery. |
Use Scenario: Holding bootloader configuration flags and communication protocol settings in 8-bit microcontroller-based PLC modules. IC Role / Device Role / Timing Role: Microwire-compatible serial EEPROM interfaced directly to MCU GPIOs with minimal firmware overhead. Use Value: 2 ms write cycle allows fast parameter updates during field service without blocking main control loop. |
| Power Supply Management | Automated Test Equipment |
|
Use Scenario: Saving user-defined voltage/current limit thresholds and calibration coefficients in programmable DC supplies. IC Role / Device Role / Timing Role: Configuration memory mapped into system BOM for traceable calibration records. Use Value: 1M endurance supports >100 recalibrations/year across 10-year production life. |
Use Scenario: Storing fixture-specific test vectors and pass/fail thresholds in modular ATE channel cards. IC Role / Device Role / Timing Role: Byte-addressable storage enabling rapid per-channel setup without reprogramming FPGA. Use Value: Industrial temp rating (–40°C to +85°C) ensures reliable operation inside heated test enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46B/ST | Same 128×8-bit organization, identical SOIC-8 package and pinout, but rated for 4.5–5.5 V and industrial temp only - no automotive grade. | Functionally identical; differs only in marking code (B vs BT); BT denotes tape-and-reel packaging. | Select 93C46B/ST if tube packaging is preferred; BT/ST is standard tape-and-reel variant with same electrical behavior. |
| 93LC46A/SN | 2.5–5.5 V VCC range, wider supply tolerance; same 128×8-bit config; SOIC-8 (SN) package; includes ORG pin (NC on A-version). | Supports lower-voltage systems (e.g., 3.3 V logic rails); requires no VCC scaling; compatible with mixed-voltage designs. | Choose 93LC46A/SN when migrating from 5 V to 3.3 V platforms; retains same instruction set and timing compatibility. |
Compared with 93C46BT/ST, 93C46B/ST offers identical functionality in tube packaging, while 93LC46A/SN extends supply flexibility to 2.5 V - both retain full Microwire compatibility and industrial temperature support without layout changes.
Availability
93C46BT/ST is available at Aetrix Electronics and suitable for industrial motor control, legacy embedded controller, and power supply management applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93C46BT/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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx family was designed specifically for cost-sensitive, space-constrained industrial systems requiring robust, low-pin-count serial EEPROMs with hardware write protection and guaranteed data integrity across wide temperature ranges.
FAQ
What is the supply voltage range for the 93C46BT/ST?
The 93C46BT/ST operates strictly within 4.5 V to 5.5 V. Its internal power-on reset circuit activates at 3.8 V, disabling all write operations below that threshold to prevent data corruption during power ramp-up or brown-out conditions. This makes it unsuitable for 3.3 V systems without level-shifting.
Does the 93C46BT/ST have an ORG pin?
No, the 93C46BT/ST does not have an ORG pin. As a 'B'-suffix variant in the 93C46 family, it is fixed at 128 × 8-bit organization. The ORG pin appears only on 'C'-suffix parts (e.g., 93C46C); on 93C46BT/ST, pins 6 and 7 are marked NC (No Connect) and must remain unconnected.
How is write protection implemented on the 93C46BT/ST?
The 93C46BT/ST uses Erase/Write Enable (EWEN) and Erase/Write Disable (EWDS) commands. It powers up in EWDS mode, blocking all erase/write operations until EWEN is issued. After each write, executing EWDS restores protection - a critical safeguard against accidental overwrites during firmware updates or noise events.
What is the maximum clock frequency supported by the 93C46BT/ST?
The 93C46BT/ST supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. This is confirmed in Table 1-2 (A1) of DS20001749K. At lower voltages (not applicable here), frequency derates to 2 MHz or 1 MHz - but 93C46BT/ST's 4.5–5.5 V range guarantees full 3 MHz operation.
Can the 93C46BT/ST be used in automotive applications?
No, the 93C46BT/ST is rated for Industrial temperature only (–40°C to +85°C). Automotive-grade variants (e.g., 93C46BT-E/ST) carry an 'E' suffix and are qualified to –40°C to +125°C. Using 93C46BT/ST in under-hood environments risks parametric failure and is not supported by Microchip's qualification data.
93C46BT/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93C46BT/ST FAQ
1.How can I place an order for 93C46BT/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46BT/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 93C46BT/ST reliable?
The price and inventory of 93C46BT/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46BT/ST is usually 5 days.
3.What payment methods are accepted for 93C46BT/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46BT/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46BT/ST?
93C46BT/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46BT/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 93C46BT/ST?
For technical support, including 93C46BT/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46BT/ST requirements.
6.How does Aetrix verify that 93C46BT/ST is sourced from the original manufacturer or authorized distributors?
All 93C46BT/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 93C46BT/ST meets industry standards.
7.What is the process for return or replacement of 93C46BT/ST?
All 93C46BT/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C46BT/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 93C46BT/ST part is unused and in its original packaging.
Return procedure for 93C46BT/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46BT/ST 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
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