Part A
ADS7841E
Texas Instruments
- Lifecycle
- Active
- Stock
- 5990 PCS
- Package
- SSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7842E/1KG4 is a functionally compatible replacement candidate for the ADS7841E, sharing the same 12-bit SAR ADC architecture, 4-channel single-ended/2-channel differential input multiplexer, and SPI-compatible serial interface. Designers should validate the package footprint and confirm timing margins against the target system before committing to production.
Resolution and Architecture
High match
Input Channel Configuration
High match
Package and Footprint
Validation required
Supply Voltage and Interface Timing
Validation required
Parts at a glance
Part B
ADS7842E/1KG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9177 PCS
- Package
- SSOP-28
- 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 | ADS7841E | ADS7842E/1KG4 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 4 (single-ended) / 2 (differential) | 4 (single-ended) / 2 (differential) | Channel count determines how many analog signals can be multiplexed into the ADC; matching counts preserve input topology compatibility. |
| Resolution | 12 bits | 12 bits | Resolution sets the smallest measurable analog step; identical resolution ensures equivalent measurement precision. |
| Sampling Rate | 200 kSPS | 200 kSPS | Throughput must meet system timing requirements; equal rates allow drop-in replacement without re-timing the acquisition loop. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Operating supply range must match the system rail; identical ranges ensure the part works in the same power domain. |
| Interface Type | SPI (serial) | SPI (serial) | Digital interface compatibility is essential for direct substitution without firmware or bus changes. |
| Package / Mounting | 16-SSOP (surface mount) | 16-SSOP (surface mount) | Package and footprint must match for PCB layout compatibility; identical packages allow direct board replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment; matching ranges ensure equivalent reliability. |
| Reference Input | External reference | External reference | Reference architecture affects accuracy and scaling; identical external reference requirements preserve measurement calibration. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7841E | ADS7842E/1KG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Sampling Rate(Per Second) | - | 200k |
| Number of Inputs | - | 4 |
| Input Type | - | Single Ended |
| Data Interface | - | Parallel |
| Configuration | - | MUX-S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | - | SAR |
| Reference Type | - | External |
| Voltage - Supply, Analog | - | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | - | 2.7V ~ 3.6V, 5V |
| Features | - | Selectable Address |
| Operating Temperature | - | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7841E and ADS7842E/1KG4?
The ADS7841E is a 12-bit, 4-channel sampling analog-to-digital converter, while the ADS7842E/1KG4 is a 12-bit, 4-channel sampling ADC with an added internal reference and a different package option. The ADS7841E is typically supplied in a 16-pin SSOP package, whereas the ADS7842E/1KG4 is supplied in a 16-pin SSOP in tape-and-reel packaging (the "1KG4" suffix denotes tape-and-reel). Both share the same resolution and channel count, but the ADS7842E/1KG4 includes an on-chip reference, which the ADS7841E does not.
Are the ADS7841E and ADS7842E/1KG4 pin-compatible?
No, they are not pin-compatible. The ADS7841E and ADS7842E/1KG4 have different pin functions because the ADS7842E/1KG4 integrates an internal reference and additional control pins. Designers must consult the respective datasheets before considering any board-level substitution.
What is the resolution and sampling rate of these ADCs?
Both the ADS7841E and ADS7842E/1KG4 are 12-bit successive-approximation analog-to-digital converters with a maximum sampling rate of 200 kSPS. These parameters are specified in the respective Texas Instruments datasheets.
How many input channels do the ADS7841E and ADS7842E/1KG4 provide?
Both devices provide 4 single-ended input channels or 2 differential input channels, configurable through the serial interface. This channel configuration is common to both the ADS7841E and ADS7842E/1KG4.
Do these devices include an internal voltage reference?
The ADS7841E does not include an internal voltage reference and requires an external reference voltage. The ADS7842E/1KG4 includes an on-chip reference, which simplifies system design by reducing external component count. This is a key differentiator between the two parts.
What is the difference in package and ordering suffix between ADS7841E and ADS7842E/1KG4?
The ADS7841E is offered in a 16-pin SSOP package. The ADS7842E/1KG4 is also offered in a 16-pin SSOP, but the "1KG4" suffix indicates tape-and-reel packaging for automated assembly. The base package type is the same, but the ordering suffix reflects the packaging format.
Can the ADS7841E be used as a drop-in replacement for the ADS7842E/1KG4?
No, the ADS7841E cannot be used as a drop-in replacement for the ADS7842E/1KG4. The absence of an internal reference on the ADS7841E and differences in pin functions mean that external circuitry and board layout would need to be redesigned. Always verify against the latest manufacturer datasheets before substitution.