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ADC121C021CIMK
Texas Instruments
IC ADC 12BIT SAR TSOT23-6
634314 Pcs New Original In Stock
12 Bit Analog to Digital Converter 1 Input 1 SAR SOT-23-THIN
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5.0 / 5.0
- (401 Ratings)
ADC121C021CIMK
Product Overview
1254793
DiGi Electronics Part Number
ADC121C021CIMK-DGManufacturer
Texas Instruments
ADC121C021CIMK
Description
IC ADC 12BIT SAR TSOT23-6Inventory
634314 Pcs New Original In Stock
12 Bit Analog to Digital Converter 1 Input 1 SAR SOT-23-THIN
Quantity
Minimum 1
Minimum 1
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ADC121C021CIMK Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
-
Series
-
Product Status
Obsolete
Number of Bits
12
Sampling Rate (Per Second)
188.9k
Number of Inputs
1
Input Type
Single Ended
Data Interface
I2C
Configuration
S/H-ADC
Ratio - S/H:ADC
1:1
Number of A/D Converters
1
Architecture
SAR
Reference Type
Supply
Voltage - Supply, Analog
2.7V ~ 5.5V
Voltage - Supply, Digital
2.7V ~ 5.5V
Features
-
Operating Temperature
-40°C ~ 105°C
Package / Case
SOT-23-6 Thin, TSOT-23-6
Supplier Device Package
SOT-23-THIN
Mounting Type
Surface Mount
Base Product Number
ADC121
Datasheet & Documents
HTML Datasheet
ADC121C021CIMK-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
ADC121C021CIMKCT
ADC121C021CIMKDKR
ADC121C021CIMKTR
Standard Package
1,000
Alternative Parts
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MANUFACTURER
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SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
신속한 고객 지원 덕분에 문제없이 거래를 마칠 수 있었어요.
de desembre 02, 2025
Their quick response after purchase reassured me that I chose the right supplier.
de desembre 02, 2025
I appreciate how knowledgeable the staff is; they make every shopping experience smooth and enjoyable.
de desembre 02, 2025
I always find the components I need, thanks to their vast inventory pool.
de desembre 02, 2025
Their professionalism really stood out—fast responses and courteous service.
de desembre 02, 2025
The company's attention to packaging safety reassures customers about product integrity.
de desembre 02, 2025
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de desembre 02, 2025
The after-sales team is fantastic—helpful, knowledgeable, and always ready to assist.
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Frequently Asked Questions (FAQ)
Can the ADC121C021CIMK be used in new designs given its obsolete status, and what are the long-term supply chain risks?
The ADC121C021CIMK is marked as obsolete by Texas Instruments, meaning it's no longer recommended for new designs due to long-term availability risks. While current stock (634,278 units) may support short-term projects, designers should plan for obsolescence mitigation. For new designs, consider actively supported alternatives like the ADC121C027CIMK/NOPB, which offers pin-to-pin compatibility and improved reliability features. Use the ADC121C021CIMK only in maintenance or legacy system repairs with adequate component buffering to avoid future production interruptions.
How does the ADC121C021CIMK perform in noisy industrial environments with high EMI, and what PCB layout techniques minimize signal integrity issues?
The ADC121C021CIMK’s single-ended input is susceptible to EMI in industrial settings, especially at its 188.9kS/s sampling rate. To maintain signal integrity, use a guard ring around the analog input trace, minimize trace length to the sensor, and place a 0.1µF ceramic capacitor close to the AIN pin. Route the ADC121C021CIMK’s analog and digital grounds separately, joining them under the device, and avoid routing high-speed digital lines near the analog section. These steps reduce noise coupling and ensure accurate 12-bit resolution under real-world conditions.
Is the ADC121C021CIMK compatible with 3.3V microcontrollers when powered from a 5V supply, and what level shifting strategy should be used on the I2C interface?
The ADC121C021CIMK supports digital supplies from 2.7V to 5.5V, so it can operate at 5V while interfacing with a 3.3V microcontroller on the I2C bus. However, direct connection risks overvoltage on the MCU’s I/O pins. Use bidirectional I2C level translators like the PCA9306 or TXS0108E to safely interface the ADC121C021CIMK’s 5V SDA/SCL lines to a 3.3V controller. Avoid pull-up resistors to 5V on SDA/SCL; instead, reference pull-ups to the 3.3V side through the translator to prevent damage and bus contention.
What are the accuracy limitations of the ADC121C021CIMK when using the internal supply-based reference, and how does it compare to external-reference ADCs like the AD7940BRJZ-REEL7?
The ADC121C021CIMK uses the analog supply as its voltage reference, so any noise or drift in VDD directly impacts conversion accuracy—this makes it less stable than ADCs with precision external references. In contrast, the AD7940BRJZ-REEL7 supports an external reference for tighter LSB control and better DC accuracy. For applications requiring high repeatability, such as sensor conditioning, the ADC121C021CIMK demands exceptionally clean power (use LC filtering and low-noise LDOs). If reference stability is critical, migrate to the AD7940BRJZ-REEL7 or use an external reference with a buffer, though the ADC121C021CIMK does not support this natively.
Can the ADC121C021CIMK replace the ADC121C027CIMK/NOPB in an existing design, and what design checks are needed for compatibility?
The ADC121C021CIMK can generally replace the ADC121C027CIMK/NOPB since both share the same TSOT-23-6 package, 12-bit SAR architecture, and I2C interface. However, verify the input voltage range and timing specifications—ADC121C021CIMK has a slightly different internal sampling capacitor and may exhibit higher input current. Also, confirm I2C address compatibility (both use 0x50 default) and ensure firmware handles the ADC121C021CIMK’s slightly different conversion start timing. Due to the obsolete status of the ADC121C021CIMK, prefer the ADC121C027CIMK/NOPB in reverse compatibility roles for better long-term support and RoHS compliance.
Quality Assurance (QC)
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ADC121C021CIMK CAD Models
Texas Instruments ADC121C021CIMK PCB symbols & footprints
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