Part A
ADS7844EB
Texas Instruments
- Lifecycle
- Active
- Stock
- 3681 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7844EB and ADS7841ESG4 are both 12-bit successive-approximation ADCs from Texas Instruments with a similar serial interface and supply range, making the ADS7841ESG4 a viable functional replacement candidate for the ADS7844EB in many designs. However, the ADS7844EB provides a 4-channel input multiplexer with single-ended or differential configurations, while the ADS7841ESG4 offers a 4-channel single-ended input structure, so channel configuration and package footprint differences must be validated against the target application before substitution.
Channel Configuration
Validation required
Resolution
High match
Supply Voltage Range
High match
Package Type
Validation required
Parts at a glance
Part B
ADS7841ESG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 5879 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 | ADS7844EB | ADS7841ESG4 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 8 (single-ended) / 4 (differential) | 4 (single-ended) / 2 (differential) | Determines how many analog signals can be measured; the ADS7844EB supports twice as many channels, so it is not a drop-in replacement where 8 channels are required. |
| Resolution | 12 bit | 12 bit | Both provide 12-bit resolution, so measurement precision is equivalent and substitutable on that basis. |
| Sampling Rate | 200 kSPS | 200 kSPS | Identical maximum throughput means timing and acquisition budgets remain compatible between the two parts. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges allow either device to operate from the same rail without redesign of the power section. |
| Interface Type | SPI / QSPI / Microwire compatible serial | SPI / QSPI / Microwire compatible serial | Same serial interface protocol means the host microcontroller firmware and wiring can be reused. |
| Package / Mounting | 20-pin SSOP (surface mount) | 16-pin SSOP (surface mount) | Different pin counts and footprints mean the PCB layout must change; they are not physically interchangeable. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure both parts suit the same industrial environments. |
| Input Type | Single-ended and differential | Single-ended and differential | Both support differential inputs, preserving noise rejection capability for the same signal conditioning approach. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844EB | ADS7841ESG4 |
|---|---|---|
| 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 ADS7844EB and ADS7841ESG4?
The ADS7844EB is an 8-channel, 12-bit successive-approximation ADC with a serial interface, housed in a 20-lead SSOP package. The ADS7841ESG4 is a 4-channel, 12-bit successive-approximation ADC with a serial interface, housed in a 16-lead QSOP package. The primary differences are channel count (8 vs 4) and package/pin count (20-lead SSOP vs 16-lead QSOP).
Are the ADS7844EB and ADS7841ESG4 pin-compatible?
No. The ADS7844EB uses a 20-lead SSOP package while the ADS7841ESG4 uses a 16-lead QSOP package. The different pin counts and package footprints mean they are not pin-compatible and cannot be dropped into the same PCB land pattern without redesign.
Do both devices share the same resolution and sampling architecture?
Yes. Both the ADS7844EB and ADS7841ESG4 are 12-bit successive-approximation register (SAR) ADCs. Both operate from a single 2.7 V to 5.25 V supply and feature a serial SPI-compatible interface, making them functionally similar in resolution and conversion architecture despite differing channel counts.
How do the input channel configurations differ between the two parts?
The ADS7844EB provides 8 input channels that can be configured as single-ended or differential pairs. The ADS7841ESG4 provides 4 input channels, also configurable as single-ended or differential. Designs requiring more analog input channels should select the ADS7844EB, while the ADS7841ESG4 suits applications with four or fewer inputs.
Can the ADS7841ESG4 be used as a substitute for the ADS7844EB in an existing design?
Not as a direct drop-in replacement. Although both are 12-bit SAR ADCs with serial interfaces, the ADS7841ESG4 has fewer channels (4 vs 8) and a different package and pinout (16-lead QSOP vs 20-lead SSOP). Substitution requires verifying channel requirements, revising the PCB layout, and validating the design against the respective manufacturer datasheets.
Do both devices support the same supply voltage range and interface?
Yes. Both the ADS7844EB and ADS7841ESG4 operate from a single supply of 2.7 V to 5.25 V and communicate via a serial interface compatible with SPI, QSPI, and Microwire protocols. This shared supply and interface compatibility simplifies migration between the two parts when channel count and package constraints permit.