Part A
ADS1278HPAP
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 1933 個数
- Package
- HTQFP-64
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1278HPAP is a higher-grade, functionally compatible alternative to the ADS1274IPAPR, offering the same 24-bit delta-sigma architecture and pin-compatible TQFP-64 footprint while extending operation to the high-temperature range. Designers should validate thermal performance and confirm the extended temperature grade meets application requirements before substituting in production.
Resolution and Architecture
High match
Package and Pinout
High match
Channel Count
Not compatible
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADS1274IPAPR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 1481 個数
- Package
- HTQFP-64
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADS1274IPAPR | ADS1278HPAP | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 4 | 8 | Channel count determines how many independent analog signals can be sampled simultaneously; a 4-channel part cannot directly replace an 8-channel part in multi-sensor systems. |
| Resolution | 24 bit | 24 bit | Both provide 24-bit resolution, so precision and dynamic range are equivalent for high-accuracy measurement applications. |
| Maximum Sample Rate | 144 kSPS | 144 kSPS | Identical maximum throughput means both can handle the same signal bandwidth and Nyquist requirements. |
| Interface Type | SPI / Serial | SPI / Serial | Matching serial interfaces allow the same host microcontroller or DSP to communicate with either device without protocol changes. |
| Supply Voltage (Analog) | 5 V | 5 V | Same analog supply simplifies power rail design and ensures comparable input voltage range. |
| Supply Voltage (Digital) | 1.8 V to 3.3 V | 1.8 V to 3.3 V | Compatible digital I/O levels allow direct connection to common logic families without level shifting. |
| Package / Case | HTQFP-64 | HTQFP-64 | Identical package and footprint enable drop-in PCB compatibility between the two parts. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Same temperature range ensures both are suitable for the same industrial and harsh-environment applications. |
| Power Consumption per Channel | Higher (fewer channels share total power) | Lower (more channels share total power) | Per-channel power affects thermal design and energy budget; the 8-channel device spreads consumption across more channels. |
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 | ADS1278HPAP | ADS1274IPAPR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 144k | 144k |
| Number of Inputs | 8 | 4 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| Number of A/D Converters | 1 | 4 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.65V ~ 1.95V | 1.65V ~ 1.95V |
| Operating Temperature | -55°C ~ 175°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS1274IPAPR and the ADS1278HPAP?
The ADS1274IPAPR is a quad-channel, 24-bit simultaneous-sampling delta-sigma ADC in a 64-pin HTQFP (PAP) package rated for the industrial temperature range of -40°C to +125°C. The ADS1278HPAP is an octal-channel, 24-bit simultaneous-sampling delta-sigma ADC in the same 64-pin HTQFP package, but it is specified for the high-temperature range of -55°C to +175°C. The primary differences are channel count (4 vs 8) and rated temperature range (industrial vs high-temperature).
Are the ADS1274IPAPR and ADS1278HPAP pin-compatible?
Both devices are offered in the same 64-pin HTQFP (PAP) package, but they are not drop-in replacements. The ADS1278 provides eight input channels while the ADS1274 provides four, so the pin functions and channel assignments differ. Designers must verify pin functions and the PCB land pattern against the respective datasheets before considering any substitution.
Do both ADCs support simultaneous sampling of all channels?
Yes. Both the ADS1274 and ADS1278 are simultaneous-sampling delta-sigma converters, meaning all channels are sampled at the same instant. The ADS1274 samples four channels simultaneously, while the ADS1278 samples eight channels simultaneously.
What is the resolution and output data rate of these converters?
Both devices are 24-bit delta-sigma ADCs. The ADS1274 and ADS1278 support selectable data rates up to 105 kSPS in high-speed mode, with lower rates available in high-resolution, low-power, and low-speed modes. Designers should confirm the exact mode and rate configuration against the manufacturer datasheet for their target operating conditions.
Can the ADS1278HPAP be used as a higher-channel-count upgrade to the ADS1274IPAPR?
The ADS1278HPAP offers eight channels versus four on the ADS1274IPAPR and extends the rated temperature range to -55°C to +175°C. However, because the channel count and pin functions differ, it is not a direct drop-in upgrade. The design must be re-validated for pin mapping, PCB layout, and thermal performance against the ADS1278HPAP datasheet.
What temperature ranges are the ADS1274IPAPR and ADS1278HPAP rated for?
The ADS1274IPAPR is rated for the industrial temperature range of -40°C to +125°C. The ADS1278HPAP is rated for the high-temperature range of -55°C to +175°C. The wider temperature rating of the ADS1278HPAP makes it suitable for harsh-environment applications.
Do both devices use the same digital interface and supply requirements?
Both the ADS1274 and ADS1278 are members of the same converter family and share a similar serial digital interface and analog/digital supply architecture. However, because the ADS1278 integrates twice the channel count, power consumption and decoupling requirements differ. Designers should consult the respective datasheets to confirm supply voltages, current consumption, and interface timing for each part.