Part A
ADS1254E
Texas Instruments
- Lifecycle
- Active
- Stock
- 4308 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1254E and ADS1241EG4 are both 24-bit delta-sigma ADCs, but they differ in resolution architecture, input channel configuration, package footprint, and interface timing, so the ADS1241EG4 cannot be used as a direct drop-in substitute for the ADS1254E without redesign and validation.
Different channel count
Different package footprint
Different input configuration
Different interface timing
Parts at a glance
Part B
ADS1241EG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9680 PCS
- Package
- SSOP-28
- 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 | ADS1254E | ADS1241EG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 4 (single-ended) | 8 (single-ended) / 4 (differential) | Channel count determines how many signals can be measured; the ADS1241 offers more inputs, affecting system architecture. |
| Maximum sample rate (SPS) | 20k | 1k | Sample rate limits the bandwidth of signals that can be captured; the ADS1254 is much faster, so it is not a drop-in for high-speed needs. |
| Interface type | SPI (serial) | SPI (serial) | Both use a serial SPI interface, simplifying digital-side compatibility between the two parts. |
| Supply voltage (analog) | 5 V | 2.7 V to 5.25 V | The wider analog supply range of the ADS1241 allows lower-voltage operation, while the ADS1254 requires a fixed 5 V rail. |
| PGA / gain stages | No integrated PGA | Integrated PGA (gain 1 to 128) | An integrated PGA allows direct amplification of small signals; the ADS1254 lacks this, requiring external amplification. |
| Package | SSOP-20 | SSOP-28 | Different package footprints and pin counts prevent direct board-level substitution without layout changes. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings mean both suit the same industrial environments. |
| Input type | Single-ended | Differential / single-ended | Differential inputs improve noise rejection; the ADS1241 supports them while the ADS1254 is single-ended only. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1254E | ADS1241EG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 20k | 15 |
| Number of Inputs | 4 | 8 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 2.7V ~ 3.3V, 5V |
| Voltage - Supply, Digital | 1.8V ~ 3.6V | 2.7V ~ 5.25V |
| Features | - | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1254E and ADS1241EG4?
The ADS1254E is a 24-bit, 4-channel delta-sigma ADC with a maximum data rate of 19.2 kSPS, housed in a 20-pin SSOP package. The ADS1241EG4 is a 24-bit, 8-channel delta-sigma ADC with a maximum data rate of 1.2 kSPS, housed in a 28-pin SSOP package. The ADS1241EG4 integrates a PGA and offers more input channels, while the ADS1254E provides a higher sampling rate.
Are the ADS1254E and ADS1241EG4 pin-compatible?
No. The ADS1254E uses a 20-pin SSOP package, while the ADS1241EG4 uses a 28-pin SSOP package. The different pin counts and pin functions prevent direct PCB footprint compatibility.
Can the ADS1254E and ADS1241EG4 be used interchangeably in an existing design?
No. Beyond package differences, the two devices differ in channel count (4 vs. 8), maximum data rate (19.2 kSPS vs. 1.2 kSPS), and integrated features such as the PGA in the ADS1241EG4. A direct substitution would require redesign of the PCB layout, input signal chain, and firmware configuration.
Which device offers a higher maximum data rate?
The ADS1254E offers a higher maximum data rate of 19.2 kSPS, compared to 1.2 kSPS for the ADS1241EG4. The ADS1254E is therefore better suited for applications requiring faster sampling, while the ADS1241EG4 targets lower-speed, higher-resolution multi-channel measurements.
Does the ADS1241EG4 include a programmable gain amplifier (PGA)?
Yes. The ADS1241EG4 integrates a PGA, allowing direct connection of low-level sensors without external amplification. The ADS1254E does not include an integrated PGA, so external signal conditioning may be required for low-level inputs.
How do the input channel counts compare between the ADS1254E and ADS1241EG4?
The ADS1254E provides 4 input channels, while the ADS1241EG4 provides 8 input channels. The ADS1241EG4 is preferable for multi-channel measurement systems, whereas the ADS1254E suits applications with fewer input channels but higher throughput requirements.
What are the package and pin count differences between the two devices?
The ADS1254E is supplied in a 20-pin SSOP package, and the ADS1241EG4 is supplied in a 28-pin SSOP package. The additional pins on the ADS1241EG4 accommodate the extra input channels and integrated PGA functionality.