Part A
ADC121S051CIMF
德州儀器
- Lifecycle
- Active
- Stock
- 1513 件
- Package
- SOT-23-6
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADC121S051CIMF is a higher-resolution variant within the same ADC121S0xx family and shares the identical SOT-23-6 footprint, pinout, and single-channel SAR architecture as the ADC121S021CIMF. It can serve as a functional replacement candidate where the increased 12-bit resolution and correspondingly higher conversion timing are acceptable, but the differing resolution, throughput, and supply current characteristics must be validated against the target design before substitution.
Resolution
Validation required
Sampling Rate
Validation required
Package Type
High match
Supply Current
Validation required
Parts at a glance
Part B
ADC121S021CIMF
德州儀器
- Lifecycle
- Active
- Stock
- 6879 件
- Package
- SOT-23-6
- Series
- 資料獲取-模數轉換器（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 | ADC121S051CIMF | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both converters provide 12-bit resolution, so quantization accuracy is equivalent. |
| Sampling Rate | 200 kSPS | 500 kSPS | The higher sampling rate of the ADC121S051CIMF allows capture of faster-changing signals, which is a key functional difference. |
| Number of Input Channels | 1 | 1 | Both are single-channel ADCs, so channel count does not affect substitutability. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, matching the same signal interface requirements. |
| Interface | SPI / QSPI / MICROWIRE / DSP | SPI / QSPI / MICROWIRE / DSP | Identical serial interfaces ensure the same digital host connection can be used. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges mean both parts work in the same power environment. |
| Package | SOT-23-6 | SOT-23-6 | Same package and pinout allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings ensure equivalent environmental robustness. |
| Power Consumption (Typical at 5 V) | Lower (200 kSPS throughput) | Higher (500 kSPS throughput) | The faster part draws more supply current, which may affect power budget in low-power designs. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC121S051CIMF | ADC121S021CIMF |
|---|---|---|
| Part Status | Obsolete | Not For New Designs |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 500k | 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 are the key differences between the ADC121S021CIMF and ADC121S051CIMF?
The ADC121S021CIMF is a 12-bit, 200 kSPS successive-approximation ADC, while the ADC121S051CIMF is a 12-bit, 500 kSPS successive-approximation ADC. Both are single-channel, single-ended devices in a SOT-23-6 package from Texas Instruments, but the ADC121S051CIMF offers a higher maximum sampling rate (500 kSPS vs 200 kSPS) and correspondingly higher power consumption.
Are the ADC121S021CIMF and ADC121S051CIMF pin-compatible?
Yes. Both devices are offered in the same 6-pin SOT-23 (CIMF) package with the same pinout: VIN, GND, VREF, CS, SCLK, and DOUT. This allows a common PCB footprint, though the higher throughput of the ADC121S051CIMF should be validated against the system timing and power budget.
What is the resolution and interface type of these ADCs?
Both the ADC121S021CIMF and ADC121S051CIMF are 12-bit ADCs with a serial SPI-compatible interface (CS, SCLK, DOUT). They operate as successive-approximation register (SAR) converters with a single-ended input and an external reference voltage applied at VREF.
How do the sampling rates of the two devices compare?
The ADC121S021CIMF supports a maximum conversion rate of 200 kSPS, whereas the ADC121S051CIMF supports up to 500 kSPS. The higher rate of the ADC121S051CIMF comes with increased supply current, so the choice depends on the required throughput versus power consumption of the target design.
What supply voltage range do the ADC121S021CIMF and ADC121S051CIMF require?
Both devices operate from a single analog supply (VA) in the 2.7 V to 5.25 V range, with a separate digital supply (VD) also specified over the same range, per the Texas Instruments datasheet. The external reference voltage at VREF sets the full-scale input range and must be within the device's specified limits.
Can the ADC121S051CIMF be used as a drop-in replacement for the ADC121S021CIMF?
Because both parts share the same package, pinout, resolution, and interface, the ADC121S051CIMF can generally serve as a higher-speed alternative in an existing ADC121S021CIMF footprint. However, the designer must verify that the higher supply current, timing, and power dissipation of the ADC121S051CIMF are acceptable for the application, and confirm all parameters against the respective datasheets.
What are the typical applications for these ADCs?
Both the ADC121S021CIMF and ADC121S051CIMF are suited to portable instrumentation, battery-powered systems, sensor interface, and general-purpose data acquisition where a small SOT-23-6 package, low power, and a simple SPI interface are required. The ADC121S051CIMF is preferred when higher sample rates are needed.