Part A
ADS8344E
Texas Instruments
- Lifecycle
- Active
- Stock
- 2647 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8343EB/2K5 is a viable functional replacement candidate for the ADS8344E, sharing the same 16-bit SAR architecture, 4-channel differential input configuration, and 2.7V to 5V supply range. Designers should validate the single-ended supply requirement and confirm SPI timing compatibility within the target system before substitution.
Resolution and Architecture
High match
Input Channel Configuration
High match
Supply Voltage Range
Validation required
Package Type
High match
Parts at a glance
Part B
ADS8343EB/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 8177 PCS
- Package
- SSOP-16
- Series
- Data Acquisition - Analog to Digital Converters (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 | ADS8344E | ADS8343EB/2K5 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | 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 ADS8344E supports twice as many inputs. |
| Sampling Rate | 100 kSPS | 100 kSPS | Throughput is the same, so timing and bandwidth requirements are met by either device. |
| Supply Voltage (Analog and Digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply range allows either part to operate from the same rails in a given design. |
| Interface Type | SPI-compatible serial (SPI/QSPI/Microwire) | SPI-compatible serial (SPI/QSPI/Microwire) | Same serial interface means firmware and host connections are compatible between the two parts. |
| Package | 20-pin SSOP (DBQ) | 16-pin SSOP (DBQ) | Different pin counts and footprints mean the parts are not drop-in replacements on the same PCB. |
| Input Configuration | Pseudo-differential, single-ended or differential | Pseudo-differential, single-ended or differential | Same input topology supports the same signal conditioning approaches for both devices. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings make them interchangeable for industrial-grade environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8344E | 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 ADS8344E and ADS8343EB/2K5?
The ADS8344E is a 16-bit, 8-channel successive-approximation ADC in a 20-pin SSOP package, while the ADS8343EB/2K5 is a 16-bit, 4-channel ADC in a 16-pin SSOP package supplied in tape-and-reel format (2,500 units per reel). Both are pin-compatible within their respective channel counts and share the same SPI-compatible serial interface and 2.7 V to 5 V supply range, but differ in channel count, package size, and packaging format.
Are the ADS8344E and ADS8343EB/2K5 pin-to-pin compatible?
No. The ADS8344E uses a 20-pin SSOP package with 8 analog input channels, whereas the ADS8343EB/2K5 uses a 16-pin SSOP package with 4 analog input channels. The different pin counts and pin assignments prevent direct PCB drop-in replacement without layout changes.
Do both devices support the same serial interface?
Yes. Both the ADS8344E and ADS8343EB/2K5 use an SPI-compatible serial interface for communication with a host microcontroller or DSP, supporting the same serial clock, data-in, and data-out signaling scheme as documented in their respective datasheets.
What is the resolution and sampling rate of these ADCs?
Both the ADS8344E and ADS8343EB/2K5 are 16-bit successive-approximation ADCs. The ADS8344E supports a throughput rate of up to 100 kSPS, and the ADS8343EB/2K5 supports up to 100 kSPS as specified in the manufacturer datasheets.
What supply voltage range do the ADS8344E and ADS8343EB/2K5 require?
Both devices operate from a single supply voltage in the range of 2.7 V to 5 V, with a separate reference input that sets the full-scale input range. This allows flexible operation in 3 V and 5 V mixed-signal systems.
What does the "2K5" suffix on ADS8343EB/2K5 indicate?
The "2K5" suffix indicates the tape-and-reel packaging quantity of 2,500 units per reel, which is the standard reeling format for automated SMT assembly. The ADS8344E is typically supplied in tube or tray packaging; the "E" suffix denotes the SSOP package variant.
Can the ADS8343EB/2K5 be used as a substitute for the ADS8344E in an existing design?
Not directly. Although both are 16-bit, 100 kSPS ADCs with SPI interfaces and the same supply range, the ADS8343EB/2K5 has only 4 analog input channels versus 8 on the ADS8344E and uses a different 16-pin package versus the 20-pin package. Substitution requires verifying channel count requirements, redesigning the PCB footprint, and confirming the input configuration against the target design.
What analog input configuration do these ADCs support?
Both the ADS8344E and ADS8343EB/2K5 support single-ended and differential analog input configurations, selectable via the serial control word. The ADS8344E provides 8 input channels (or 4 differential pairs), while the ADS8343EB/2K5 provides 4 input channels (or 2 differential pairs), as specified in the respective datasheets.