Part A
ADS8344NB
Texas Instruments
- Lifecycle
- Active
- Stock
- 5654 PCS
- Package
- SSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8344NB and ADS8343EB/2K5G4 are both 16-bit successive-approximation ADCs in the same TSSOP-20 package family with identical resolution and SPI-compatible serial interface, making them a viable functional replacement candidate. However, the ADS8344NB provides 8 single-ended or 4 pseudo-differential input channels, while the ADS8343EB/2K5G4 offers 4 single-ended or 2 pseudo-differential channels, so channel count and input configuration must be validated against the target application before substitution.
Channel Count
Validation required
Resolution
High match
Package Type
High match
Serial Interface
High match
Parts at a glance
Part B
ADS8343EB/2K5G4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9386 PCS
- Package
- SSOP-16
- 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 | ADS8344NB | ADS8343EB/2K5G4 | 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. |
| Sampling rate (max) | 100 kSPS | 100 kSPS | Throughput is the same, so timing-critical designs can generally swap without speed penalty. |
| Supply voltage (analog & digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply range means both can operate from the same rails in a given system. |
| Interface type | SPI / QSPI / Microwire compatible serial | SPI / QSPI / Microwire compatible serial | Same serial interface allows drop-in compatibility with existing microcontroller firmware and bus wiring. |
| Input type | Single-ended and pseudo-differential | Single-ended and pseudo-differential | Matching input configurations support the same sensor and signal-conditioning topologies. |
| Package / mounting | 20-pin SSOP (surface mount) | 16-pin SSOP (surface mount) | Different pin counts and footprints mean the PCB layout must be redesigned; they are not footprint-compatible. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings allow use in the same industrial environments. |
| Reference input | External reference | External reference | Both require an external voltage reference, so the same reference circuit can be reused. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8344NB | ADS8343EB/2K5G4 |
|---|---|---|
| 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/2K5G4?
The ADS8344NB is a 16-bit, 8-channel successive-approximation ADC in a 20-pin PDIP package, while the ADS8343EB/2K5G4 is a 16-bit, 4-channel SAR ADC in a 16-pin SSOP package supplied in tape-and-reel form. The ADS8344NB provides twice the input channel count, whereas the ADS8343EB/2K5G4 offers a smaller footprint and reel packaging suited to automated assembly.
Do the ADS8344NB and ADS8343EB/2K5G4 have the same resolution and sample rate?
Yes. Both devices are 16-bit successive-approximation ADCs specified for a 100 kSPS throughput rate, so resolution and conversion speed are equivalent between the two parts.
Are the ADS8344NB and ADS8343EB/2K5G4 pin-compatible?
No. The ADS8344NB uses a 20-pin PDIP package, while the ADS8343EB/2K5G4 uses a 16-pin SSOP package. The differing pin counts and package outlines mean the two devices are not drop-in replacements and require different PCB land patterns.
How do the input channel configurations of the ADS8344NB and ADS8343EB/2K5G4 compare?
The ADS8344NB provides 8 single-ended inputs or 4 differential input pairs, whereas the ADS8343EB/2K5G4 provides 4 single-ended inputs or 2 differential input pairs. Designs requiring more analog channels should account for this difference.
What supply voltage and reference requirements apply to both devices?
Both the ADS8344NB and ADS8343EB/2K5G4 operate from a single 2.7 V to 5 V supply and use an external reference voltage applied to the VREF pin to set the input full-scale range. The reference must be supplied externally in both cases.
What digital interface do the ADS8344NB and ADS8343EB/2K5G4 use?
Both devices use a serial SPI-compatible interface for communication with a host controller, allowing conversion results and channel selection commands to be transferred over a standard serial bus.
What does the /2K5G4 suffix indicate on the ADS8343EB/2K5G4 ordering code?
The suffix denotes tape-and-reel packaging in a quantity of 2,500 units per reel, with the G4 designation indicating lead-free (RoHS-compliant) construction per the manufacturer's ordering information. The ADS8344NB is supplied in tube packaging.