Part A
ADS8344NB
德州儀器
- Lifecycle
- Active
- Stock
- 5654 件
- Package
- SSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS8343EB/2K5 is a viable functional replacement candidate for the ADS8344NB in many designs, as both are 16-bit SAR ADCs with similar resolution and serial interface architecture. However, the ADS8343EB/2K5 offers a lower maximum sampling rate and a reduced input channel count, so the replacement is only appropriate where the system's throughput and multiplexing requirements fall within the ADS8343EB/2K5's capabilities. Designers should validate the sampling rate margin and channel requirements before committing to the substitution.
Resolution
High match
Sampling Rate
Validation required
Input Channel Count
Not compatible
Serial Interface
High match
Parts at a glance
Part B
ADS8343EB/2K5
德州儀器
- Lifecycle
- Active
- Stock
- 8177 件
- Package
- SSOP-16
- 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 | ADS8344NB | ADS8343EB/2K5 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Number of Input Channels | 8 (single-ended) / 4 (differential) | 4 (single-ended) / 2 (differential) | Channel count determines how many signals can be multiplexed into one ADC; the ADS8344 supports twice as many inputs. |
| Input Configuration | Single-ended or differential (software selectable) | Single-ended or differential (software selectable) | Both support flexible input modes, so this is not a differentiator. |
| Sampling Rate (max) | 100 kSPS | 100 kSPS | Throughput is identical, so speed is not a differentiator for substitution. |
| Supply Voltage (analog & digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Both operate over the same wide supply range, allowing use in 3 V and 5 V systems interchangeably. |
| Interface | SPI / QSPI / Microwire compatible serial | SPI / QSPI / Microwire compatible serial | Identical serial interface means the same host microcontroller connections can be reused. |
| Package | 20-pin SSOP (DBQ) | 16-pin SSOP (DBQ) | Different pin counts and footprints mean the PCB layout must change; they are not drop-in replacements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range, so environmental suitability is equivalent. |
| Reference Input | External reference (VREF) | External reference (VREF) | Both require an external reference, so reference design considerations are the same. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8344NB | ADS8343EB/2K5 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 100k |
| Number of Inputs | 4, 8 | 2, 4 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | S/H-ADC | 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 are the key differences between the ADS8344NB and the ADS8343EB/2K5?
The ADS8344NB is a 16-bit, 8-channel successive-approximation ADC in a 20-pin PDIP package, while the ADS8343EB/2K5 is a 16-bit, 4-channel ADC in a 16-pin SSOP package supplied in tape-and-reel format. The ADS8344NB provides twice the input channel count, whereas the ADS8343EB/2K5 offers a smaller footprint and reel packaging suited to automated assembly.
Do the ADS8344NB and ADS8343EB/2K5 have the same resolution and sampling rate?
Yes. Both devices are 16-bit successive-approximation ADCs with a maximum throughput of 100 kSPS, per the respective Texas Instruments datasheets.
Are the ADS8344NB and ADS8343EB/2K5 pin-compatible?
No. The ADS8344NB uses a 20-pin PDIP package, while the ADS8343EB/2K5 uses a 16-pin SSOP package. The differing pin counts and package outlines mean they are not drop-in replacements and require different PCB land patterns.
How do the input channel configurations differ between the two devices?
The ADS8344NB provides 8 single-ended inputs or 4 differential input pairs, while the ADS8343EB/2K5 provides 4 single-ended inputs or 2 differential input pairs. Both feature a serial SPI-compatible interface.
What are the supply voltage requirements for the ADS8344NB and ADS8343EB/2K5?
Both devices operate from a single 2.7 V to 5.25 V analog supply, per the Texas Instruments datasheets. Designers should confirm the digital interface supply level against the host controller in the target design.
What does the /2K5 suffix on the ADS8343EB/2K5 indicate?
The /2K5 suffix denotes tape-and-reel packaging with 2,500 units per reel, as specified in the Texas Instruments ordering information. The ADS8344NB is supplied in tube packaging in the PDIP option.
Can the ADS8343EB/2K5 replace the ADS8344NB in an existing design?
Not directly. Although both are 16-bit, 100 kSPS ADCs with SPI-compatible interfaces, the ADS8343EB/2K5 has fewer input channels and a different package and pinout. A replacement requires PCB redesign and validation of channel count, package footprint, and interface timing against the target design.