Part A
ADC121S021CIMF
Texas Instruments
- Lifecycle
- Active
- Stock
- 6879 PCS
- Package
- SOT-23-6
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADC121S021CIMF and ADC121S021CIMFX are functionally equivalent 12-bit, 1-channel SAR analog-to-digital converters from Texas Instruments, sharing identical core specifications including resolution, sampling rate, supply voltage range, and serial interface. The only distinction is the tape-and-reel packaging suffix, making them interchangeable for design and production purposes where reel packaging is acceptable.
Resolution and Sampling Rate
High match
Supply Voltage Range
High match
Interface Type
High match
Package Type
High match
Parts at a glance
Part B
ADC121S021CIMFX
Texas Instruments
- Lifecycle
- Active
- Stock
- 7767 PCS
- Package
- SOT-23-6
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADC121S021CIMF | ADC121S021CIMFX | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Determines the number of discrete levels the ADC can represent; identical resolution means equivalent measurement granularity. |
| Number of Channels | 1 | 1 | Single-channel input defines the number of analog signals that can be sampled; matching channel count ensures functional interchangeability. |
| Sampling Rate | 200 kSPS | 200 kSPS | Maximum conversion speed affects the bandwidth of signals the ADC can capture; identical rates preserve timing performance. |
| Input Type | Single-ended | Single-ended | Defines whether the input is measured relative to ground or differentially; matching input type ensures the same signal conditioning works. |
| Interface | SPI / Microwire / QSPI | SPI / Microwire / QSPI | Digital communication protocol must match the host controller; identical interfaces allow drop-in replacement without firmware changes. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Operating supply range must be compatible with the system rail; matching ranges ensure the same power design applies. |
| Package / Mounting | SOT-23-6, Surface Mount | SOT-23-6, Surface Mount | Footprint and mounting style must match the PCB layout; identical packages allow physical interchangeability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range determines suitability for the target environment; matching ranges ensure equivalent reliability. |
| Reference Type | Supply-referenced | Supply-referenced | Reference configuration affects accuracy and scaling of the conversion; matching reference type preserves measurement behavior. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC121S021CIMF | ADC121S021CIMFX |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Not For New Designs | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | Supply | Supply |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between ADC121S021CIMF and ADC121S021CIMFX?
The ADC121S021CIMF and ADC121S021CIMFX are functionally identical 12-bit, 1 MSPS, single-channel SAR analog-to-digital converters from Texas Instruments. The difference is the packaging/ordering suffix: the CIMF suffix denotes the SOT-23-6 package in a specific reel or tube quantity, while the CIMFX suffix denotes the same SOT-23-6 package supplied in a different tape-and-reel quantity or carrier option. Both share the same datasheet, electrical specifications, and pinout.
Are ADC121S021CIMF and ADC121S021CIMFX electrically interchangeable?
Yes. Both parts are the same silicon die in the same SOT-23-6 package with identical pinout, supply voltage range (2.7 V to 5.25 V), 12-bit resolution, and 1 MSPS maximum throughput. They can be used interchangeably in the same PCB footprint and circuit design.
What is the resolution and sampling rate of the ADC121S021?
The ADC121S021 is a 12-bit successive-approximation register (SAR) ADC with a maximum sampling rate of 1 MSPS (1,000 kSPS). It provides a single-ended input channel.
What supply voltage range does the ADC121S021CIMF/CIMFX support?
Both variants operate from a single supply voltage of 2.7 V to 5.25 V, making them suitable for 3.3 V and 5 V systems. The digital interface (SPI-compatible) levels track the supply voltage.
What is the package type and pin count for these devices?
Both the ADC121S021CIMF and ADC121S021CIMFX are offered in a 6-pin SOT-23 package. The pinout includes VIN, VDD, GND, CS (chip select), SCLK (serial clock), and DOUT (serial data output).
What digital interface do the ADC121S021CIMF and ADC121S021CIMFX use?
Both devices use a SPI-compatible serial interface with separate chip-select (CS), serial clock (SCLK), and data-output (DOUT) pins, allowing direct connection to most microcontrollers and DSPs.
Do the ADC121S021CIMF and ADC121S021CIMFX differ in operating temperature range?
No. Both are specified over the industrial temperature range of −40 °C to +85 °C, as defined in the Texas Instruments datasheet for the ADC121S021 family.
Which part number should be used for new designs?
Either part is acceptable for new designs since they are electrically and mechanically identical. The choice between the CIMF and CIMFX suffix depends on the required packaging quantity and reel/carrier format for the production line; consult the Texas Instruments ordering information table for the exact reel size and quantity associated with each suffix.