Part A
ADS1278HPAP
德州儀器
- Lifecycle
- Active
- Stock
- 1933 件
- Package
- HTQFP-64
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS1278HPAP is a functionally compatible replacement candidate for the ADS1278IPAPR, sharing the same 8-channel simultaneous-sampling 24-bit delta-sigma architecture, identical TQFP-64 package and pinout, and the same serial interface and supply framework. The primary distinction is the temperature grade: the H-grade variant is specified for the extended -55°C to +125°C range versus the I-grade -40°C to +105°C, so the substitution is valid provided the target application's thermal profile falls within the I-grade envelope or the extended range is genuinely required. Electrical performance should be validated against the application's noise and linearity budget before production release.
Package and Pinout
High match
Channel Count and Resolution
High match
Operating Temperature Range
Validation required
Supply Voltage and Interface
Validation required
Parts at a glance
Part B
ADS1278IPAPR
德州儀器
- Lifecycle
- Active
- Stock
- 1566 件
- Package
- HTQFP-64
- Series
- 資料獲取-模數轉換器（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 | ADS1278IPAPR | ADS1278HPAP | Why it matters |
|---|---|---|---|
| Operating Temperature Range | -40°C to +85°C | -55°C to +125°C | The H-grade part supports a wider military/industrial temperature range, enabling use in harsher environments where the I-grade part would be out of spec. |
| Grade / Qualification | Industrial grade | High-temperature / enhanced grade | The H-grade device is screened and qualified for extended temperature operation, which affects reliability and suitability for demanding applications. |
| Resolution | 24 bit | 24 bit | Both converters provide 24-bit resolution, so precision and dynamic range are equivalent for signal-chain design. |
| Number of Channels | 8 (simultaneous sampling) | 8 (simultaneous sampling) | Identical channel count and simultaneous sampling allow the same multi-channel acquisition architecture to be reused. |
| Architecture | Delta-sigma | Delta-sigma | Same delta-sigma topology means comparable noise shaping, filtering behavior, and anti-aliasing requirements. |
| Package | 64-pin HTQFP (PAP) | 64-pin HTQFP (PAP) | Identical package and pinout allow drop-in board replacement without layout changes. |
| Supply Voltage | 5 V analog / 1.8 V digital (typical) | 5 V analog / 1.8 V digital (typical) | Matching supply requirements mean the same power rails and decoupling can be used for either part. |
| Interface | SPI-compatible serial | SPI-compatible serial | Same digital interface ensures firmware and host-controller connections remain compatible. |
| Data Output Rate | Up to 105 kSPS | Up to 105 kSPS | Equivalent maximum output rate preserves timing and throughput budgets in the acquisition system. |
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 | ADS1278IPAPR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 144k | 144k |
| Number of Inputs | 8 | 8 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| 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 ~ 105°C |
Frequently asked questions
What are the key differences between the ADS1278IPAPR and the ADS1278HPAP?
Both are 8-channel, 24-bit simultaneous-sampling delta-sigma ADCs from Texas Instruments in a 64-pin HTQFP (PAP) package. The primary difference is the temperature grade: the ADS1278IPAPR is specified over the industrial temperature range of –40°C to +85°C, while the ADS1278HPAP is specified over the wider –40°C to +125°C range. The "R" suffix on ADS1278IPAPR denotes tape-and-reel packaging, whereas ADS1278HPAP is supplied in tube/tray form.
Are the ADS1278IPAPR and ADS1278HPAP pin-compatible and footprint-compatible?
Yes. Both devices use the same 64-pin HTQFP (PAP) package with identical pin assignments and PCB land patterns, so they are drop-in compatible from a mechanical and pinout standpoint. The difference is limited to temperature grade and packing format.
Do the ADS1278IPAPR and ADS1278HPAP share the same electrical performance specifications?
Both are 24-bit, 8-channel simultaneous-sampling delta-sigma converters with selectable data rates up to 144 kSPS and selectable filter modes (High-Speed, High-Resolution, Low-Power, Low-Speed). AC and DC performance such as SNR, THD, and INL are specified per the respective datasheet over each device's rated temperature range; the H-grade part is characterized and tested to meet the same performance limits across the extended –40°C to +125°C range.
Which part should be selected for an application operating above +85°C ambient?
The ADS1278HPAP should be selected for ambient temperatures above +85°C, since it is specified to +125°C. The ADS1278IPAPR is only guaranteed over –40°C to +85°C and should not be used outside that range without separate qualification.
What is the difference in packaging between the ADS1278IPAPR and ADS1278HPAP?
The ADS1278IPAPR is delivered in tape-and-reel (the "R" suffix), which suits automated high-volume SMT assembly. The ADS1278HPAP is supplied in standard tube/tray packaging. Both use the same 64-pin HTQFP (PAP) body.
Can the ADS1278IPAPR be substituted with the ADS1278HPAP in an existing design?
Yes, from a pinout and footprint perspective they are interchangeable. Substitution is appropriate when the design requires or benefits from the extended –40°C to +125°C rating of the H-grade part; verify that the supply, reference, clock, and digital interface conditions in the target design match the ADS1278HPAP datasheet limits before release.
Do both devices support the same digital interface and clocking options?
Yes. Both parts provide the same SPI-compatible serial interface, frame-sync and modulator modes, and support for daisy-chaining and multiple-channel synchronization, as documented in the ADS1278 datasheet family. Clocking, filter mode selection, and power-down control are identical across the two temperature grades.