Part A
ADC121S101CIMF
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 3205 個数
- Package
- SOT-23-6
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADC121S101CIMF is a higher-resolution functional upgrade to the ADC121S051CIMF, sharing the same package, pinout, supply range, and serial interface while doubling resolution from 8-bit to 12-bit. It is a viable replacement candidate where the host SPI timing can accommodate the additional data bits, but the increased conversion time and reduced throughput must be validated against system requirements before substitution.
Resolution
High match
Package and Pinout
High match
Sampling Rate
Validation required
Serial Interface Timing
Validation required
Parts at a glance
Part B
ADC121S051CIMF
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 1513 個数
- Package
- SOT-23-6
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADC121S051CIMF | ADC121S101CIMF | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both converters provide 12-bit resolution, so quantization step size and achievable SNR are equivalent. |
| Sampling Rate | 200 kSPS | 1 MSPS | The ADC121S101 supports a much higher throughput, enabling faster signal acquisition and wider input bandwidth than the ADC121S051. |
| Number of Input Channels | 1 single-ended | 1 single-ended | Both are single-channel devices, so channel count does not differentiate them for multiplexed applications. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply range allows either part to operate from the same system rails without level shifting. |
| Interface Type | SPI / QSPI / MICROWIRE compatible | SPI / QSPI / MICROWIRE compatible | Both use the same serial interface, so firmware and bus wiring are interchangeable between the two parts. |
| 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 | Equivalent temperature ratings mean both parts suit the same industrial and automotive environments. |
| Power Consumption (Typical) | Lower due to 200 kSPS throughput | Higher due to 1 MSPS throughput | The faster ADC121S101 draws more supply current at full rate, which affects power budget and thermal design. |
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 | ADC121S101CIMF | ADC121S051CIMF |
|---|---|---|
| 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 is the primary difference between the ADC121S051CIMF and the ADC121S101CIMF?
The main difference is resolution and conversion timing. The ADC121S051CIMF is a 12-bit, 500 kSPS successive-approximation ADC, while the ADC121S101CIMF is a 12-bit, 1 MSPS successive-approximation ADC. Both are single-channel, 12-bit devices in the same SOT-23-6 package, but the ADC121S101CIMF supports a higher maximum throughput rate.
Are the ADC121S051CIMF and ADC121S101CIMF pin-compatible?
Yes. Both devices are offered in the same 6-pin SOT-23 package (CIMF suffix) and share the same pinout: VIN, GND, VREF, CS, SCLK, and DOUT. This allows a common PCB footprint, but the higher throughput of the ADC121S101CIMF must be validated against the system timing and clock requirements.
What is the maximum sampling rate of each device?
The ADC121S051CIMF has a maximum conversion rate of 500 kSPS. The ADC121S101CIMF has a maximum conversion rate of 1 MSPS. Both are specified for 12-bit resolution over their respective throughput ranges.
Do both parts use the same supply voltage and reference configuration?
Yes. Both devices operate from a single 2.7 V to 5.25 V supply and use an external reference applied to the VREF pin. The analog input range is 0 V to VREF, and both use a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards.
Can the ADC121S101CIMF directly replace the ADC121S051CIMF in an existing design?
In many cases yes, because both are 12-bit, single-channel, pin-compatible SOT-23-6 devices with the same supply and reference requirements. However, the replacement must be validated: the ADC121S101CIMF supports up to 1 MSPS, so the digital host must be able to clock and read conversions at the higher rate, and the analog front-end must settle within the shorter acquisition time.
What is the power consumption of these ADCs?
Both devices are low-power successive-approximation ADCs. Power consumption scales with supply voltage and throughput; the ADC121S101CIMF, operating at up to 1 MSPS, will draw more average current at full rate than the ADC121S051CIMF at 500 kSPS. For exact quiescent and active current specifications, refer to the respective manufacturer datasheets.
What interface do these ADCs use to communicate with a microcontroller?
Both devices use a serial interface with CS (chip select), SCLK (serial clock), and DOUT (serial data output). The interface is compatible with SPI, QSPI, MICROWIRE, and DSP serial ports, allowing direct connection to most microcontrollers and DSPs without external glue logic.
Are the ADC121S051CIMF and ADC121S101CIMF available in the same operating temperature range?
Both are offered in the CIMF suffix, which denotes the SOT-23-6 package. The industrial temperature range for these devices is typically −40 °C to +85 °C. Designers should confirm the exact temperature grade against the specific manufacturer datasheet revision before release.