Part A
ADC128S022CIMT
德州儀器
- Lifecycle
- Active
- Stock
- 4583 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADC128S022CIMT and ADC12138CIMSA are not drop-in replacements for one another. Although both are 12-bit successive-approximation ADCs, they differ in resolution architecture, channel count, digital interface, and package footprint, so a direct board-level substitution is not possible without redesign.
Different channel count
Different digital interface
Different package footprint
Different conversion architecture
Parts at a glance
Part B
ADC12138CIMSA
德州儀器
- Lifecycle
- Active
- Stock
- 8410 件
- 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 | ADC128S022CIMT | ADC12138CIMSA | Why it matters |
|---|---|---|---|
| Resolution (bits) | 12 | 12 | Both are 12-bit ADCs, so nominal measurement resolution is equivalent. |
| Number of input channels | 8 | 8 | Channel count determines how many analog signals can be multiplexed into a single converter. |
| Architecture | SAR | SAR | Successive-approximation architecture affects latency, power, and suitability for multiplexed sampling. |
| Interface type | SPI (serial) | SPI (serial) | A matching serial interface simplifies drop-in replacement on an existing digital bus. |
| Supply voltage range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Compatible supply ranges allow the parts to operate from the same system rail. |
| Package / mounting | TSSOP-16 (surface mount) | SOIC-16 (surface mount) | Different package footprints require board layout changes and affect thermal and assembly considerations. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +85 °C | The wider temperature rating of one part may be required for harsh or industrial environments. |
| Conversion / throughput rate | Up to 200 kSPS | Up to 114 kSPS | Maximum sampling rate limits how fast signals can be digitized in the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC128S022CIMT | ADC12138CIMSA |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate (Per Second) | - | 114k |
| Number of Inputs | 8 | 4, 8 |
| Input Type | Single Ended | Differential, Pseudo-Differential, Single Ended |
| Data Interface | SPI, DSP | SPI |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A / D Converters | - | 1 |
| Architecture | SAR | SAR |
| Reference Type | Supply | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 3V ~ 5.5V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Base Product Number | - | ADC121 |
| Sampling Rate(Per Second) | 200k | - |
| Number of A/D Converters | 1 | - |
Frequently asked questions
What are the key differences between the ADC128S022CIMT and the ADC12138CIMSA?
The ADC128S022CIMT is an 8-channel, 12-bit successive-approximation ADC with a serial interface, operating from a 2.7 V to 5.25 V supply, offered in a TSSOP-16 package. The ADC12138CIMSA is a 12-bit successive-approximation ADC with a serial interface, offered in an SOIC-20 package. The two devices differ in channel count, package, and supply range, so they are not pin-compatible substitutes.
Are the ADC128S022CIMT and ADC12138CIMSA pin-compatible?
No. The ADC128S022CIMT is supplied in a 16-pin TSSOP package, while the ADC12138CIMSA is supplied in a 20-pin SOIC package. The differing pin counts and package footprints prevent direct pin-to-pin replacement without PCB redesign.
What is the resolution and architecture of each device?
Both devices are 12-bit successive-approximation register (SAR) analog-to-digital converters. The ADC128S022CIMT provides 12-bit resolution across 8 input channels, and the ADC12138CIMSA provides 12-bit resolution with a serial interface in its SOIC-20 package.
What supply voltage ranges do these ADCs support?
The ADC128S022CIMT operates from a single supply of 2.7 V to 5.25 V. The ADC12138CIMSA operates from a single 5 V supply. Designs migrating between the two must verify that the system supply matches the respective device requirements.
What interface do these converters use?
Both the ADC128S022CIMT and the ADC12138CIMSA use a serial digital interface for communication with a host controller. The serial interface allows connection to SPI-compatible or similar serial ports, but the exact protocol timing and frame format should be confirmed against each device's datasheet before reuse of firmware.
Can the ADC128S022CIMT be used as a drop-in replacement for the ADC12138CIMSA?
No. Because the devices differ in package (TSSOP-16 versus SOIC-20), channel configuration, and supply range, a drop-in replacement is not possible. Any substitution requires schematic, layout, and firmware validation against the manufacturer datasheet of the target device.
What are the package and mounting considerations when comparing these two parts?
The ADC128S022CIMT uses a 16-pin TSSOP surface-mount package, and the ADC12138CIMSA uses a 20-pin SOIC surface-mount package. PCB land patterns, thermal pad requirements, and board space differ between the two, so layout must be reviewed before considering either part in a new or revised design.