Part A
ADS7844E/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 3096 PCS
- Package
- SSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7841EG4 is a functional replacement candidate for the ADS7844E/2K5, sharing the same 12-bit SAR architecture, 4-channel input multiplexer, and 200 kSPS throughput in a comparable SOIC package. However, the ADS7844E/2K5 offers a single-ended input configuration while the ADS7841EG4 provides a pseudo-differential input configuration, and the two devices differ in their serial interface framing and reference input arrangement. Designers should validate the input configuration, interface timing, and reference topology against the target application before substituting.
Resolution and Throughput
High match
Channel Count
High match
Input Configuration
Validation required
Package Type
Validation required
Parts at a glance
Part B
ADS7841EG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8773 PCS
- Package
- SSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS7841EG4 | 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 is not a drop-in substitution. |
| Resolution | 12 bit | 12 bit | Both provide 12-bit resolution, so measurement granularity is equivalent and resolution alone does not block substitutability. |
| Sampling Rate | 200 kSPS | 200 kSPS | Identical throughput means timing budgets and anti-alias filter design remain valid across both parts. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges allow the same rail design to power either device without level shifting or regulator changes. |
| Interface Type | SPI-compatible serial (4-wire) | SPI-compatible serial (4-wire) | A common serial interface means the host microcontroller firmware and bus wiring can be reused. |
| Package / Pin Count | SSOP-20 | SSOP-16 | Different package pin counts require a PCB layout change and prevent direct footprint compatibility. |
| Input Type | Single-ended and differential | Single-ended and differential | Both support single-ended and differential inputs, preserving flexibility for sensor front-ends. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure both parts suit the same industrial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844E/2K5 | ADS7841EG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| 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 the ADS7841EG4?
The ADS7844E/2K5 is an 8-channel, 12-bit successive-approximation ADC with a serial interface, housed in a 20-pin SSOP package and supplied in tape-and-reel form (2K5 suffix). The ADS7841EG4 is a 4-channel, 12-bit SAR ADC in a 16-pin SSOP package, supplied in tube form (G4 suffix indicates lead-free/RoHS-compliant construction). The primary differences are channel count (8 vs 4), package pin count (20 vs 16), and packaging format.
Are the ADS7844E/2K5 and ADS7841EG4 pin-compatible?
No. The ADS7844E/2K5 uses a 20-pin SSOP package, while the ADS7841EG4 uses a 16-pin SSOP package. The differing pin counts and pin assignments mean they are not drop-in replacements and require different PCB footprints.
Do both devices share the same resolution and interface type?
Yes. Both are 12-bit successive-approximation ADCs with a serial SPI-compatible interface, operating from a single 2.7 V to 5.25 V supply. Both support a 4-wire serial interface for communication with microcontrollers and DSPs.
How do the input channel configurations differ between the two parts?
The ADS7844E/2K5 provides 8 input channels that can be configured as single-ended or differential pairs. The ADS7841EG4 provides 4 input channels, also configurable as single-ended or differential. Designs requiring more analog input channels should select the ADS7844E/2K5.
What is the significance of the /2K5 and G4 suffixes?
The /2K5 suffix on the ADS7844E/2K5 indicates tape-and-reel packaging with 2,500 units per reel, suited to automated high-volume assembly. The G4 suffix on the ADS7841EG4 denotes lead-free (RoHS-compliant) construction, with the device supplied in standard tube packaging.
Can the ADS7841EG4 be used as a substitute for the ADS7844E/2K5 in an existing design?
Not directly. Although both are 12-bit SAR ADCs with serial interfaces, the ADS7841EG4 has only 4 input channels versus 8 on the ADS7844E/2K5, and the package is 16-pin versus 20-pin. Substitution requires verifying channel count adequacy, redesigning the PCB footprint, and validating timing and reference requirements against the respective datasheets.
Do both ADCs support the same reference and power-supply arrangements?
Both devices operate from a single supply in the 2.7 V to 5.25 V range and use an external reference voltage applied to the VREF pin to set the full-scale input range. Designers should confirm the specific reference voltage limits and input range specifications in each device's respective datasheet before finalizing the design.