My Inquiry
My Account
Microchip Technology 93C46B/SN
- Part No.:
- 93C46B/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46B/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,490
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93C46B/SN from Microchip Technology Inc. is a 1Kbit (64 × 16-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 ERAL/WRAL support, Ready/Busy status via DO pin, and >200-year data retention. Used for configuration storage in embedded controllers and power management ICs.
For engineers reviewing the 93C46B/SN datasheet, 93C46B/SN pinout, 93C46B/SN application, or 93C46B/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 aligned to DS20001749K revision K.
Technical Context
The 93C46B/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins. It operates exclusively in fixed 16-bit word mode (no ORG pin - NC on 'B' devices), requiring 25 clock cycles per READ/WRITE instruction. Its internal auto-erase-before-write logic eliminates external erase commands for single-word writes.
Power-on reset circuitry disables write operations until VCC exceeds 3.8 V, and the device powers up in EWDS (Erase/Write Disable) state. Programming cycles are initiated by the rising edge of CLK on the final data bit - a key behavioral distinction from 93AA/93LC variants that use CS falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 words × 16 bits); supports dedicated 16-bit serial communication without ORG pin configuration. |
| VCC Range | 4.5 V to 5.5 V; write operations disabled below 3.8 V (VPOR threshold), ensuring robust power-fail protection. |
| Clock Frequency | Up to 3 MHz at VCC ≥ 4.5 V; enables fast configuration loading in microcontroller boot sequences. |
| Write Cycle Time | 2 ms typical (TWC); self-timed, eliminating need for external delay timers in firmware. |
| Endurance | 1,000,000 erase/write cycles; suitable for dynamic parameter logging with frequent updates. |
| Data Retention | Greater than 200 years at +25°C; guarantees long-term reliability in unattended industrial systems. |
| Interface | 3-wire Microwire-compatible (CS/CLK/DI/DO); requires no address bus or parallel control lines. |
Pinout & Package
93C46B/SN is packaged in 8-lead SOIC (SN), with lead finish Pb-free Matte Tin. Pin 1 is marked by laser dot; pin 6 is VCC, pin 5 is NC (no internal connection), and pin 7 is ORG - designated NC for 'B' devices per Device Selection Table and Pin Function Table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but completes ongoing write. |
| CLK (Pin 2) | Serial Clock | Positive-edge synchronized I/O; rising edge initiates write cycle on final data bit (93C-specific behavior). |
| DI (Pin 3) | Data Input | Accepts Start bit, opcode, address (A5–A0), and 16-bit data; no internal pull-up/down. |
| DO (Pin 4) | Data Output / Status | Outputs 16-bit read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read states. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be connected before VCC during power-up sequencing. |
| NC (Pin 6) | No Connection | Physically present but unconnected internally; must be left floating or tied to GND per layout best practice. |
| ORG (Pin 7) | Organization Select | No internal connection on 93C46B; unused - device permanently configured for 16-bit word mode. |
| VCC (Pin 8) | Power Supply | 4.5–5.5 V only; VPOR = 3.8 V ensures write inhibition during brown-out conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates firmware wait loops - host MCU proceeds after initiating command; DO pin confirms completion. |
| Automatic ERAL before WRAL | WRAL instruction includes full-array erase, removing need for separate ERAL command in bulk update routines. |
| Power-On/Off Data Protection | Hardware-enforced write disable below 3.8 V prevents corruption during power ramp-up/down or dropout. |
| Ready/Busy Status Signal | DO pin doubles as status indicator - avoids polling delays or external busy lines in resource-constrained designs. |
| Sequential Read Mode | Holding CS high enables automatic address increment and continuous 16-bit output - ideal for block reads. |
Applications
| Industrial Motor Control | Smart Energy Metering |
|---|---|
Use Scenario: Storing calibration coefficients, fault history logs, and motor profile parameters across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced to MCU via 3-wire Microwire; accessed during boot and runtime parameter updates. Use Value: 1M endurance and >200-year retention ensure reliable operation over 15+ year product lifetime in sealed enclosures. |
Use Scenario: Holding tariff tables, meter ID, tamper-event timestamps, and firmware version metadata. IC Role / Device Role / Timing Role: Serial EEPROM providing secure, low-pin-count storage for metrology SoC with strict BOM cost targets. Use Value: 4.5–5.5 V operation matches standard 5 V rail; SOIC-8 (SN) footprint simplifies PCB routing and rework. |
| Automotive Body Control Module (BCM) | Medical Diagnostic Equipment |
Use Scenario: Saving user preferences (mirror position, seat settings), diagnostic trouble codes (DTCs), and module configuration. IC Role / Device Role / Timing Role: Dedicated 16-bit EEPROM interfaced to 8-bit MCU with limited GPIO; uses minimal SPI-like signals. Use Value: Industrial temp grade (–40°C to +85°C) meets under-hood ambient requirements; RoHS-compliant SN package supports automotive assembly. |
Use Scenario: Storing calibration constants for analog front-end sensors, device serial number, and regulatory compliance flags. IC Role / Device Role / Timing Role: Configuration memory for FPGA-based acquisition subsystem; accessed during power-on self-test (POST). Use Value: 2 ms write time enables fast calibration save; Ready/Busy signaling prevents race conditions in safety-critical boot sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B/SN | Wider VCC range (2.5–5.5 V); same 64×16 organization and SOIC-8 package; supports extended temperature (–40°C to +125°C). | Enables direct use in 3.3 V systems without level-shifting; suitable for automotive E-temp designs where 93C46B/SN is not rated. | Select 93LC46B/SN if operating voltage may drop below 4.5 V or if AEC-Q100 automotive qualification is required. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128×8), 1.8–5.5 V, 20 MHz max clock; different instruction set and no Ready/Busy pin. | Lacks DO-based status signaling - requires software timeout or interrupt-driven polling; higher speed but incompatible protocol stack. | Choose AT25010B-SSHL-T only when migrating to SPI infrastructure and accepting firmware rewrite for status handling. |
Compared with 93LC46B/SN, the 93C46B/SN offers tighter VCC tolerance and simpler power-rail design in 5 V-only systems, while AT25010B-SSHL-T trades protocol compatibility for higher throughput and broader voltage flexibility - neither is pin- or firmware-compatible.
Availability
93C46B/SN is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, and medical diagnostic equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for 93C46B/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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona.
The 93Cxx family was designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal MCU resource usage - emphasizing simplicity, power robustness, and long-term data integrity.
FAQ
What is the memory organization of the 93C46B/SN?
The 93C46B/SN has a fixed 64 × 16-bit organization - it does not support 8-bit mode. Unlike 'C' variants, the ORG pin is NC (no internal connection), so word size is hardwired. This eliminates external configuration logic and simplifies firmware for 16-bit data structures. The 93C46B/SN stores exactly 1,024 bits across 64 addresses, each holding 16 bits.
Does the 93C46B/SN require an external pull-up resistor on the DO pin?
No, the 93C46B/SN does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when inactive. However, a 10 kΩ pull-down on CS is recommended per datasheet Section 2.3 to prevent spurious activation during power-up or noise events - this applies to the 93C46B/SN's CS pin, not DO.
How is the write cycle initiated on the 93C46B/SN?
On the 93C46B/SN, the write cycle is initiated by the rising edge of CLK on the final data bit - not by CS falling edge (which applies to 93AA/93LC variants). After clocking in the 16-bit data, the next CLK rising edge triggers the self-timed 2 ms auto-erase-and-write sequence. This timing behavior is explicitly defined in DS20001749K Figures 2-9 and 2-11 for '93C' devices.
Can the 93C46B/SN operate at 3.3 V?
No, the 93C46B/SN cannot operate reliably at 3.3 V. Its specified VCC range is strictly 4.5 V to 5.5 V, and its power-on reset threshold (VPOR) is 3.8 V. Attempting 3.3 V operation will inhibit all write functions and may cause unpredictable read behavior. For 3.3 V systems, consider the 93LC46B/SN (2.5–5.5 V) or 93AA46B/SN (1.8–5.5 V) as functionally equivalent alternatives.
What is the purpose of the NC pin (Pin 6) on the 93C46B/SN SOIC package?
Pin 6 on the 93C46B/SN is labeled NC (No Connection) in the official pinout and has no internal connection. It must be left floating or tied to ground per PCB layout best practices - never driven high or used as a signal trace. This differs from Pin 7 (ORG), which is also NC on 'B' devices but appears in the pin function table as "Organization/93XX46C No Internal Connection/93XX46A/B". Pin 6 serves purely as a mechanical placeholder in the SOIC-8 footprint.
93C46B/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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-SOIC
93C46B/SN FAQ
1.How can I place an order for 93C46B/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46B/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 93C46B/SN reliable?
The price and inventory of 93C46B/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46B/SN is usually 5 days.
3.What payment methods are accepted for 93C46B/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46B/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46B/SN?
93C46B/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46B/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 93C46B/SN?
For technical support, including 93C46B/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46B/SN requirements.
6.How does Aetrix verify that 93C46B/SN is sourced from the original manufacturer or authorized distributors?
All 93C46B/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 93C46B/SN meets industry standards.
7.What is the process for return or replacement of 93C46B/SN?
All 93C46B/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46B/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 93C46B/SN part is unused and in its original packaging.
Return procedure for 93C46B/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46B/SN 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…
