Part A
ADS1278HPAP
Texas Instruments
- Lifecycle
- Active
- Stock
- 1933 PCS
- Package
- HTQFP-64
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1278HPAP and ADS1278IPAPTG4 are functionally equivalent 8-channel, 24-bit simultaneous-sampling delta-sigma ADCs sharing the same HTQFP-64 package and core architecture, making them viable functional replacement candidates. The primary distinction lies in their operating temperature grading, so the replacement decision should be validated against the target application's thermal environment and screening requirements.
Resolution and Channel Count
High match
Package Type
High match
Operating Temperature Range
Validation required
Supply Voltage and Interface
High match
Parts at a glance
Part B
ADS1278IPAPTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9726 PCS
- Package
- TQFP-64
- 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 | ADS1278HPAP | ADS1278IPAPTG4 | Why it matters |
|---|---|---|---|
| Operating Temperature Range | -55°C to +125°C | -40°C to +85°C | The H-grade part supports a wider military/industrial temperature range, making it suitable for harsh environments where the I-grade part would not be rated. |
| Product Grade / Qualification | High-temperature grade (H) | Industrial grade (I) | Grade determines guaranteed performance limits over temperature and qualification level; substituting one grade for another may violate system reliability requirements. |
| Package / Carrier | HTQFP-64 (PAP) tray | HTQFP-64 (PAP) tape and reel | Both use the same HTQFP-64 package, but the shipping carrier differs (tray vs. tape-and-reel), which affects automated assembly line compatibility. |
| Resolution | 24 bit | 24 bit | Resolution defines the smallest measurable signal step; identical 24-bit resolution means equivalent precision capability. |
| Number of Channels | 8 (simultaneous sampling) | 8 (simultaneous sampling) | Channel count and simultaneous sampling determine how many signals can be captured in parallel with matched timing. |
| Sample Rate (Max) | 144 kSPS | 144 kSPS | Maximum sample rate bounds the bandwidth of signals the ADC can digitize; identical rates mean equivalent throughput. |
| Supply Voltage | 5 V analog, 1.8 V digital | 5 V analog, 1.8 V digital | Supply requirements must match the board's power rails for a drop-in substitution to work without redesign. |
| Interface Type | SPI / serial (frame-sync) | SPI / serial (frame-sync) | The digital interface must be compatible with the host controller; identical interfaces allow firmware reuse. |
| Architecture | Delta-sigma | Delta-sigma | Converter architecture affects noise shaping, filter characteristics, and latency; matching architecture preserves signal-chain behavior. |
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 | ADS1278IPAPTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| 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 ADS1278HPAP and ADS1278IPAPTG4?
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 ADS1278HPAP is specified over the extended high-temperature range of -55°C to +175°C, while the ADS1278IPAPTG4 is specified over the industrial range of -40°C to +125°C. The "G4" suffix on the ADS1278IPAPTG4 denotes a green/RoHS-compliant package variant.
Are the ADS1278HPAP and ADS1278IPAPTG4 pin-compatible?
Yes. Both devices are offered in the same 64-pin HTQFP (PAP) package with identical pin functions, so they are pin-compatible. However, the ADS1278HPAP should only be used where the extended -55°C to +175°C operating range is required, and the ADS1278IPAPTG4 is limited to -40°C to +125°C.
What is the maximum operating temperature of each device?
The ADS1278HPAP is rated for operation from -55°C to +175°C. The ADS1278IPAPTG4 is rated for operation from -40°C to +125°C. Designs must not exceed the specified temperature range of the selected grade.
Do both parts share the same resolution and data rate specifications?
Yes. Both are 24-bit delta-sigma ADCs with eight simultaneous-sampling channels and support data rates up to 144 kSPS in high-speed mode. The core conversion performance is common to the ADS1278 family; the grade designation primarily reflects the guaranteed operating temperature range.
What does the "G4" suffix on the ADS1278IPAPTG4 indicate?
The "G4" suffix is Texas Instruments' designation for a green, RoHS-compliant package finish. It indicates the device meets lead-free/RoHS requirements. The ADS1278HPAP is supplied in the standard package finish; designers requiring RoHS compliance should confirm the specific ordering code and finish with the manufacturer's datasheet.
Can the ADS1278IPAPTG4 be used as a drop-in replacement for the ADS1278HPAP?
Only if the application's operating temperature stays within -40°C to +125°C. Because the ADS1278IPAPTG4 is not guaranteed above +125°C, it cannot replace the ADS1278HPAP in designs that operate up to +175°C. Package and pin functions are otherwise compatible, but the temperature grade difference must be validated against the target design requirements.
Which part should be selected for high-temperature applications?
The ADS1278HPAP should be selected for applications requiring operation beyond +125°C, since it is specified to +175°C. The ADS1278IPAPTG4 is appropriate for industrial applications within -40°C to +125°C where RoHS compliance is desired.