Part A
ADS1255IDBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2109 PCS
- Package
- SSOP-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1255IDBR 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 treated as a direct drop-in substitute for the ADS1255IDBR without a full board and firmware redesign.
Different input channel configuration
Different package footprint
Different data output rate
Different interface timing
Parts at a glance
Part B
ADS1241EG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9680 PCS
- Package
- SSOP-28
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS1255IDBR | ADS1241EG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not distinguish them for substitutability. |
| Number of input channels | 2 (differential) / 1 (differential) | 8 (single-ended) / 4 (differential) | Channel count determines how many sensors or signals can be multiplexed into one ADC; the ADS1241 offers more inputs. |
| Maximum sample rate (SPS) | 30k | 1.5k | Sample rate limits the bandwidth of signals that can be captured; the ADS1255 supports much faster conversion. |
| PGA gain range | 1 to 64 | 1 to 128 | Programmable gain affects the smallest signal that can be resolved; the ADS1241 provides higher gain for low-level sensors. |
| Supply voltage (analog) | 5 V (4.75 V to 5.25 V) | 2.7 V to 5.25 V | Supply range determines compatibility with the system power rail; the ADS1241 supports lower-voltage operation. |
| Interface | SPI | SPI | Both use SPI, so the digital host interface is compatible for direct substitution. |
| Package | 20-SSOP | 28-SSOP | Package footprint and pin count must match the PCB layout for a drop-in replacement. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental compatibility is equivalent. |
| Input type | Differential | Single-ended / Differential | Input configuration affects sensor wiring and noise rejection; the ADS1241 supports both single-ended and differential inputs. |
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 | ADS1255IDBR | ADS1241EG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 30k | 15 |
| Number of Inputs | 1, 2 | 8 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-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 | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1255IDBR and the ADS1241EG4?
The ADS1255IDBR is a 24-bit delta-sigma ADC with a single differential input (or two pseudo-differential inputs) and a programmable gain amplifier, offering data rates up to 30 kSPS. The ADS1241EG4 is a 24-bit delta-sigma ADC with a 4-channel differential input multiplexer and a PGA, with data rates up to 1 kSPS. The ADS1255IDBR provides higher throughput and a single-channel architecture, while the ADS1241EG4 provides multi-channel input flexibility at lower speed.
Are the ADS1255IDBR and ADS1241EG4 pin-compatible or package-compatible?
No. The ADS1255IDBR is supplied in a 20-pin SSOP package (DBR suffix), while the ADS1241EG4 is supplied in a 28-pin SSOP package (EG4 suffix). The pin counts and pin functions differ, so they are not drop-in replacements and require different PCB land patterns.
How do the maximum data rates of the ADS1255IDBR and ADS1241EG4 compare?
The ADS1255IDBR supports programmable data rates up to 30 kSPS. The ADS1241EG4 supports data rates up to 1 kSPS. The ADS1255IDBR is therefore better suited for higher-speed measurement applications, while the ADS1241EG4 targets lower-speed, multi-channel sensing.
How many input channels does each device provide?
The ADS1255IDBR provides one differential input (or two pseudo-differential inputs). The ADS1241EG4 provides a 4-channel differential input multiplexer, allowing selection among multiple differential input pairs. This makes the ADS1241EG4 preferable for multi-sensor systems, while the ADS1255IDBR suits single-channel high-resolution measurements.
Do both devices include a programmable gain amplifier (PGA)?
Yes. Both the ADS1255IDBR and the ADS1241EG4 integrate a programmable gain amplifier. The PGA allows low-level sensor signals to be amplified before conversion, improving effective resolution for small input signals. Gain settings should be verified against the respective manufacturer datasheets for the exact supported ranges.
What are the supply voltage requirements for the ADS1255IDBR and ADS1241EG4?
Both devices operate from a 5 V analog supply with a separate digital supply. The ADS1255IDBR uses a 5 V analog supply (AVDD) and a 1.8 V to 3.6 V digital supply (DVDD). The ADS1241EG4 uses a 5 V analog supply and a 2.7 V to 5.25 V digital supply. Designers should confirm exact limits in the respective datasheets before finalizing power rails.
Can the ADS1255IDBR directly replace the ADS1241EG4 in an existing design?
No. The two devices differ in package pin count (20-pin vs 28-pin SSOP), input channel architecture, maximum data rate, and digital supply range. A direct replacement is not possible without redesigning the PCB, revalidating the input multiplexing, and confirming timing and interface compatibility against both datasheets.
Which device is more suitable for multi-channel low-speed sensor acquisition?
The ADS1241EG4 is more suitable because it integrates a 4-channel differential input multiplexer, enabling multiple sensors to be connected to a single ADC. Its 1 kSPS maximum data rate is adequate for low-speed multi-channel acquisition. The ADS1255IDBR, with a single differential input, is better suited to single-channel applications requiring higher throughput up to 30 kSPS.