Part A
ADS7844E/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 3096 PCS
- Package
- SSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7844E/2K5G4 is a functionally equivalent variant of the ADS7844E/2K5, differing only in the G4 lead-finish designation. Both parts share identical core specifications, making the G4 version a viable drop-in candidate where the alternate finish is acceptable.
Resolution and Architecture
High match
Channel Count and Input Type
High match
Package and Pinout
High match
Lead Finish and Ordering Variant
Validation required
Parts at a glance
Part B
ADS7844E/2K5G4
Texas Instruments
- Lifecycle
- Active
- Stock
- 2200 PCS
- Package
- SSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS7844E/2K5 | ADS7844E/2K5G4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Determines the smallest analog signal change the ADC can distinguish; identical resolution means equivalent measurement precision. |
| Number of Channels | 8 single-ended / 4 differential | 8 single-ended / 4 differential | Defines how many analog inputs can be multiplexed into the converter; matching channel count ensures the same system connectivity. |
| Sampling Rate | 200 kSPS | 200 kSPS | Sets the maximum conversion throughput; identical rate means the same signal bandwidth can be captured. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Determines compatibility with the system power rail; matching range allows drop-in use in the same supply design. |
| Interface Type | SPI (serial) | SPI (serial) | Defines the digital communication protocol with the host; identical interface ensures firmware and wiring compatibility. |
| Package / Case | 20-SSOP (Shrink Small Outline) | 20-SSOP (Shrink Small Outline) | Determines PCB footprint and assembly; identical package allows the same board layout without redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Specifies environmental limits for reliable operation; matching range ensures suitability for the same application environments. |
| Mounting Type | Surface Mount | Surface Mount | Indicates assembly method; identical mounting type confirms the parts are interchangeable on the same PCB assembly process. |
| Packaging / Ordering Suffix | Tape & Reel (2K5) | Tape & Reel (G4 green/RoHS variant) | The G4 suffix denotes a green/RoHS-compliant ordering variant; functionally equivalent but relevant for compliance and procurement requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844E/2K5 | ADS7844E/2K5G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 4, 8 | 4, 8 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between ADS7844E/2K5 and ADS7844E/2K5G4?
The ADS7844E/2K5 and ADS7844E/2K5G4 are functionally identical 8-channel, 12-bit successive-approximation analog-to-digital converters from Texas Instruments. The "G4" suffix denotes a lead-free (Pb-free) package finish compliant with RoHS, while the base ADS7844E/2K5 part may carry a different package finish. Both are supplied in a 20-pin SSOP package and are rated for the same electrical performance. The "2K5" suffix indicates tape-and-reel packaging of 2,500 units.
Are the ADS7844E/2K5 and ADS7844E/2K5G4 electrically interchangeable?
Yes. Both variants share the same die, pinout, 12-bit SAR architecture, 8-channel input multiplexer, and specified electrical characteristics, including a sampling rate of up to 200 kSPS and a supply voltage range of 2.7 V to 5.25 V. The only documented difference is the package finish (G4 = lead-free/RoHS-compliant). Designers should confirm the specific package finish required by their assembly and compliance requirements.
What is the function of the ADS7844E/2K5 and ADS7844E/2K5G4?
Both devices are 12-bit successive-approximation analog-to-digital converters with an 8-channel input multiplexer. They are used to digitize multiple analog signals in applications such as battery-powered systems, data acquisition, and portable instrumentation. They support a serial interface compatible with SPI and QSPI protocols and operate from a single 2.7 V to 5.25 V supply.
What package and pin count do the ADS7844E/2K5 and ADS7844E/2K5G4 use?
Both parts are offered in a 20-pin SSOP (Shrink Small Outline Package) designated by the "E" suffix in the part number. The pinout is identical between the two variants, so PCB land patterns and footprint designs are the same.
Does the G4 suffix affect the operating temperature range or performance specifications?
No. The G4 suffix only indicates a lead-free (Pb-free) package finish. The operating temperature range, resolution, sampling rate, supply voltage range, and other electrical specifications are the same for both the ADS7844E/2K5 and ADS7844E/2K5G4. Refer to the official Texas Instruments datasheet for the complete verified specification table.
Can the ADS7844E/2K5G4 be used as a drop-in replacement for the ADS7844E/2K5?
Yes, from an electrical and footprint standpoint the two parts are drop-in compatible because they share the same die, pinout, and package. The substitution is appropriate when the lead-free (RoHS-compliant) package finish of the G4 variant is acceptable or required. Verify the specific finish and compliance requirements of the target assembly before substituting.
What is the meaning of the 2K5 suffix on both part numbers?
The "2K5" suffix indicates tape-and-reel packaging containing 2,500 units per reel. This packaging designation applies identically to both the ADS7844E/2K5 and ADS7844E/2K5G4, so the reel quantity and packaging format are the same for both variants.