Part A
ADC121S101CIMF
Texas Instruments
- Lifecycle
- Active
- Stock
- 3205 PCS
- Package
- SOT-23-6
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADC121S051CIMFX is a functional replacement candidate for the ADC121S101CIMF, sharing the same 12-bit SAR architecture, single-ended input, and SOT-23-6 footprint, but it must be validated against the lower 500 kSPS throughput and reduced power consumption before substitution in existing designs.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
ADC121S051CIMFX
Texas Instruments
- Lifecycle
- Active
- Stock
- 3257 PCS
- Package
- SOT-23-6
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADC121S101CIMF | ADC121S051CIMFX | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Bit depth determines the number of discrete output codes and the achievable quantization step; both parts match here, so resolution is not a differentiator. |
| Sampling Rate | 1 MSPS | 500 kSPS | Maximum conversion throughput limits the highest signal frequency that can be captured; the 1 MSPS part supports faster sampling than the 500 kSPS part. |
| Number of Input Channels | 1 single-ended | 1 single-ended | Channel count defines how many analog signals can be measured; both are single-channel devices, so multiplexing requirements are identical. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Operating supply range determines compatibility with the system rail; identical ranges mean either part can share the same power supply design. |
| Interface Type | SPI / QSPI / MICROWIRE compatible serial | SPI / QSPI / MICROWIRE compatible serial | The digital interface must match the host controller; both use the same serial protocol, so firmware and bus wiring are interchangeable. |
| Package / Mounting | SOT-23-6, surface mount | SOT-23-6, surface mount | Package and footprint determine PCB layout compatibility; identical SOT-23-6 packages allow drop-in replacement without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range defines the environments where the part is qualified; matching industrial ranges means equal environmental suitability. |
| Power Consumption (Typical) | Approx. 2 mW at 3 V, 1 MSPS | Approx. 1 mW at 3 V, 500 kSPS | Power draw affects thermal budget and battery life; the lower-speed part consumes less power, which may matter in energy-sensitive designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC121S101CIMF | ADC121S051CIMFX |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 500k |
| 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 ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADC121S101CIMF and ADC121S051CIMFX?
The ADC121S101CIMF is a 12-bit, 1 MSPS successive-approximation ADC, while the ADC121S051CIMFX is a 12-bit, 500 kSPS version. Both are single-channel, single-ended ADCs from Texas Instruments in SOT-23-6 packages, but the CIMF variant supports twice the maximum sampling rate of the CIMFX variant.
Are the ADC121S101CIMF and ADC121S051CIMFX pin-compatible?
Yes. Both devices are offered in the same 6-pin SOT-23 (DBV) package with identical pin functions: VIN, GND, VA, CS, SCLK, and DOUT. This allows the same PCB land pattern to accommodate either part.
What is the maximum sampling rate of each device?
The ADC121S101CIMF supports a maximum conversion rate of 1 MSPS. The ADC121S051CIMFX supports a maximum conversion rate of 500 kSPS. Both are specified for operation with a 2.7 V to 5.25 V supply.
Do both parts use the same serial interface?
Yes. Both devices use a standard SPI-compatible serial interface with separate chip-select (CS), serial clock (SCLK), and data-out (DOUT) pins, allowing direct connection to most microcontrollers and DSPs.
What is the resolution and architecture of these ADCs?
Both the ADC121S101CIMF and ADC121S051CIMFX are 12-bit successive-approximation register (SAR) analog-to-digital converters with a single-ended input and an internal track-and-hold circuit.
Can the ADC121S051CIMFX be used as a drop-in replacement for the ADC121S101CIMF?
Electrically and mechanically the parts are pin-compatible, but the CIMFX has a lower maximum sampling rate (500 kSPS vs 1 MSPS). It can replace the CIMF only if the system's sampling requirements do not exceed 500 kSPS and all timing specifications are revalidated against the datasheet.
What are the operating temperature ranges for these devices?
Both the ADC121S101CIMF and ADC121S051CIMFX are specified for the industrial temperature range of −40°C to +85°C, as indicated by the "C" grade suffix in the part number.