Part A
ADS7844EB
德州儀器
- Lifecycle
- Active
- Stock
- 3681 件
- Package
- SSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7844EB and ADS7841ES/2K5 are both 12-bit SAR ADCs from Texas Instruments sharing a compatible serial interface and similar supply requirements, but they differ in channel count and package footprint. The ADS7844EB offers 8 input channels in a 20-pin SSOP, while the ADS7841ES/2K5 provides 4 input channels in a 16-pin SOIC, so the ADS7841ES/2K5 can serve as a functional substitute only where the reduced channel count and different footprint are acceptable to the design.
Channel Count
Validation required
Package Type
Validation required
Resolution
High match
Serial Interface
High match
Parts at a glance
Part B
ADS7841ES/2K5
德州儀器
- Lifecycle
- Active
- Stock
- 8265 件
- Package
- SSOP-16
- 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 | ADS7844EB | ADS7841ES/2K5 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 8 (single-ended) / 4 (differential) | 4 (single-ended) / 2 (differential) | Channel count determines how many analog signals can be multiplexed into the ADC; a drop from 8 to 4 channels changes system architecture and may require an external multiplexer. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest measurable analog step; both are 12-bit, so quantization granularity is equivalent. |
| Sampling Rate (max) | 200 kSPS | 200 kSPS | Maximum throughput affects how fast the system can digitize signals; identical rates mean comparable timing performance. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Supply range determines compatibility with 3 V and 5 V logic systems; matching ranges allow drop-in use in the same power domain. |
| Interface Type | SPI / QSPI / Microwire (serial) | SPI / QSPI / Microwire (serial) | Serial interface compatibility ensures the same microcontroller pins and firmware protocol can be reused without redesign. |
| Package | 20-pin SSOP (DBQ) | 16-pin SSOP (DBQ) | Different pin counts and footprints mean the PCB layout must change; the parts are not physically drop-in interchangeable. |
| Input Type | Single-ended / differential (software selectable) | Single-ended / differential (software selectable) | Selectable input configuration supports both referenced and floating signal sources; matching capability preserves measurement flexibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments where the part is guaranteed to meet specs; identical ratings suit the same industrial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844EB | ADS7841ES/2K5 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 4, 8 | 4 |
| Input Type | Differential, Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the key architectural differences between the ADS7844EB and ADS7841ES/2K5?
The ADS7844EB is an 8-channel, 12-bit successive-approximation ADC with a serial interface, housed in a 20-lead SSOP package. The ADS7841ES/2K5 is a 4-channel, 12-bit successive-approximation ADC with a serial interface, supplied in a 16-lead SSOP package on tape and reel. The primary differences are channel count (8 vs. 4) and package pin count (20 vs. 16).
Are the ADS7844EB and ADS7841ES/2K5 pin-compatible?
No. The ADS7844EB uses a 20-lead SSOP package, while the ADS7841ES/2K5 uses a 16-lead SSOP package. The differing pin counts and pin functions prevent direct pin-to-pin substitution without PCB redesign.
Do both devices support the same analog input configuration?
Both are 12-bit SAR ADCs with single-ended and differential input capability, but the ADS7844EB provides 8 input channels while the ADS7841ES/2K5 provides 4 input channels. The channel multiplexer configuration and input voltage range should be verified against the respective datasheets for the target design.
What is the difference in package and ordering quantity between the two parts?
The ADS7844EB is supplied in a 20-lead SSOP package. The ADS7841ES/2K5 is supplied in a 16-lead SSOP package and the "2K5" suffix indicates tape-and-reel packaging with 2,500 units per reel, per the manufacturer's ordering information.
Can the ADS7841ES/2K5 be used as a drop-in replacement for the ADS7844EB?
No. Because the two devices differ in channel count (4 vs. 8) and package pin count (16 vs. 20), a direct drop-in replacement is not possible. Any substitution requires validation of channel requirements, pinout, and PCB land pattern against the manufacturer datasheets.
Do both ADCs use the same serial interface protocol?
Both devices provide a serial digital interface for communication with a host controller, but the exact protocol details, control byte format, and timing specifications differ between the ADS7844 and ADS7841 families. Designers should consult the respective datasheets to confirm interface compatibility with the host SPI or serial port.
Which device should be selected for an application requiring more analog input channels?
The ADS7844EB should be selected when 8 analog input channels are required, since it provides twice the channel count of the ADS7841ES/2K5, which offers 4 channels. Selection should also account for package size and PCB layout constraints.