Part A
ADS7844E/2K5
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 3096 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7841ES/2K5 is a functional replacement candidate for the ADS7844E/2K5 in many applications, but it is not a drop-in equivalent. Both are 12-bit SAR ADCs in the same 16-pin QSOP package with a similar SPI-compatible serial interface, yet they differ in channel count, input configuration, and conversion throughput. Designers must validate channel architecture, sampling rate headroom, and reference/supply requirements against the target application before substituting.
Channel Count
Validation required
Input Configuration
Validation required
Conversion Throughput
Validation required
Package Type
High match
Parts at a glance
Part B
ADS7841ES/2K5
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 8265 PCS
- Package
- SSOP-16
- Series
- Data Acquisition - Analog to Digital Converters (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 | ADS7844E/2K5 | 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; the ADS7844 supports twice as many inputs, so it is not a drop-in substitute where 8 channels are required. |
| Resolution | 12 bits | 12 bits | Both provide 12-bit resolution, so measurement precision and LSB size are equivalent, supporting functional interchangeability on that basis. |
| Sampling Rate | 200 kSPS | 200 kSPS | Identical maximum throughput means timing budgets and anti-aliasing requirements remain the same when swapping parts. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges allow the same power rail design to be reused without level shifting or regulator changes. |
| Interface Type | SPI-compatible serial | SPI-compatible serial | A common serial interface means the same microcontroller pins and firmware protocol can drive either device. |
| Package | SSOP-20 | SSOP-16 | Different package footprints and pin counts require PCB layout changes, so the parts are not physically interchangeable without a board redesign. |
| Pin Count | 20 | 16 | Differing pin counts confirm the devices are not pin-compatible and cannot be swapped in an existing socket. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ratings mean both suit the same environmental conditions. |
| Input Type | Single-ended / differential | Single-ended / differential | Both support single-ended and differential configurations, preserving signal-conditioning flexibility. |
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 | ADS7844E/2K5 | 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 differences between the ADS7844E/2K5 and ADS7841ES/2K5?
The ADS7844E/2K5 is an 8-channel, 12-bit successive-approximation ADC, while the ADS7841ES/2K5 is a 4-channel, 12-bit SAR ADC. Both operate from a single 2.7 V to 5 V supply and offer a 200 kHz throughput rate, but the ADS7844 provides twice the input channel count. The ADS7844E is supplied in a 20-lead SSOP package, whereas the ADS7841ES is supplied in a 16-lead SSOP package.
Are the ADS7844E/2K5 and ADS7841ES/2K5 pin-compatible?
No. The ADS7844E/2K5 uses a 20-lead SSOP package and the ADS7841ES/2K5 uses a 16-lead SSOP package, so they have different pin counts and pinouts and are not drop-in replacements for each other.
Do both devices support the same serial interface?
Yes. Both the ADS7844 and ADS7841 use a serial SPI-compatible interface for communication with a host controller, allowing configuration and conversion result readback over the same interface type.
What is the resolution and throughput of each device?
Both the ADS7844E/2K5 and ADS7841ES/2K5 are 12-bit ADCs with a specified throughput rate of 200 kHz, making them suitable for comparable sampling-rate applications despite their different channel counts.
How do the input channel counts differ between the two parts?
The ADS7844E/2K5 provides 8 analog input channels, while the ADS7841ES/2K5 provides 4 analog input channels. Designs requiring more single-ended or multiplexed inputs should account for this difference when selecting between the two.
What supply voltage range do these ADCs require?
Both the ADS7844 and ADS7841 operate from a single supply voltage in the range of 2.7 V to 5 V, supporting low-power and mixed-supply system designs.
Can the ADS7841ES/2K5 be used as a direct substitute for the ADS7844E/2K5?
No. Because the two devices differ in package size, pin count, and number of analog input channels, a direct substitution is not possible without redesigning the PCB layout and verifying the reduced channel count against the application requirements.