Part A
ADS7844NB/1K
德州儀器
- Lifecycle
- Active
- Stock
- 5039 件
- Package
- SSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7844E/2K5 and ADS7844NB/1K are functionally compatible 12-bit 8-channel serial ADCs sharing the same core architecture, resolution, channel count, and interface, making them viable substitutes in most designs. The primary distinction lies in package and ordering format, so verification of the exact package, temperature grade, and reel configuration against the target assembly is recommended before substitution.
Resolution and Channel Count
High match
Interface Type
High match
Package Type
Validation required
Temperature Grade
Validation required
Parts at a glance
Part B
ADS7844E/2K5
德州儀器
- Lifecycle
- Active
- Stock
- 3096 件
- Package
- SSOP-20
- 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 | ADS7844E/2K5 | ADS7844NB/1K | Why it matters |
|---|---|---|---|
| Package / Mounting | SSOP-20 (Surface Mount) | PDIP-20 (Through-Hole) | Footprint and assembly method differ; a board designed for one package cannot directly accept the other without layout changes. |
| Packaging / Ordering Quantity | Tape & Reel (2000 units) | Tube (1000 units) | Different delivery formats affect automated SMT vs. through-hole assembly lines and inventory handling. |
| Resolution | 12 bit | 12 bit | Identical resolution means equivalent measurement precision for the analog input signal. |
| Number of Input Channels | 8 single-ended / 4 differential | 8 single-ended / 4 differential | Same channel count and configuration allow equivalent multi-signal acquisition capability. |
| Sampling Rate | 200 kSPS | 200 kSPS | Matching throughput ensures the same maximum conversion speed for the application. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply range means the same power rail can be used without redesign. |
| Interface | SPI (Serial) | SPI (Serial) | Same serial interface protocol allows drop-in firmware compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature range ensures the same environmental operating limits. |
| ADC Architecture | SAR (Successive Approximation) | SAR (Successive Approximation) | Same conversion architecture yields comparable linearity and latency behavior. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844NB/1K | ADS7844E/2K5 |
|---|---|---|
| Part Status | Active | Active |
| 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 are the key differences between the ADS7844E/2K5 and the ADS7844NB/1K?
Both are 12-bit, 8-channel, serial-output successive-approximation ADCs from Texas Instruments with the same core conversion architecture and 200 kSPS throughput. The primary differences are package and ordering format: the ADS7844E/2K5 is supplied in a 20-pin SSOP (DBQ) package and is provided on a 2,500-piece tape-and-reel, while the ADS7844NB/1K is supplied in a 20-pin PDIP (N) package and is provided in a 1,000-piece tube/rail format. The "NB" suffix denotes the PDIP package option.
Are the ADS7844E/2K5 and ADS7844NB/1K electrically and functionally interchangeable?
Yes. Both devices share the same 12-bit SAR ADC core, 8-channel input multiplexer, serial interface, and specified performance characteristics per the Texas Instruments ADS7844 datasheet. The functional behavior and electrical specifications are common across package options; the differences are limited to package type, thermal characteristics, and shipping format. Designers should still verify package-specific thermal and mechanical parameters against the datasheet.
What is the difference in package type and how does it affect PCB assembly?
The ADS7844E/2K5 uses a 20-pin SSOP (Shrink Small Outline Package, DBQ) intended for surface-mount assembly, while the ADS7844NB/1K uses a 20-pin PDIP (Plastic Dual In-line Package, N) intended for through-hole or socketed assembly. The SSOP suits automated SMT reflow lines and compact layouts; the PDIP suits prototyping, sockets, and through-hole boards. PCB land patterns and assembly processes are not interchangeable between the two.
What are the ordering quantity and packaging differences between the two part numbers?
The ADS7844E/2K5 is ordered in a 2,500-piece tape-and-reel (the "2K5" suffix indicates 2,500 units per reel), which is compatible with automated pick-and-place equipment. The ADS7844NB/1K is ordered in a 1,000-piece quantity (the "1K" suffix), typically supplied in tube/rail packaging. Buyers should confirm the exact packaging format with the distributor at time of order.
Do both parts share the same resolution, channel count, and sampling rate?
Yes. Per the Texas Instruments ADS7844 datasheet, both are 12-bit successive-approximation ADCs with an 8-channel input multiplexer (4 differential or 8 single-ended inputs) and a specified throughput of 200 kSPS. These core specifications are common to the ADS7844 family regardless of package option.
Which part should be selected for a new surface-mount design versus a through-hole prototype?
For a new surface-mount production design, the ADS7844E/2K5 (20-pin SSOP, tape-and-reel) is the appropriate choice for automated SMT assembly. For through-hole prototyping, socketed evaluation, or legacy boards using PDIP footprints, the ADS7844NB/1K (20-pin PDIP) is appropriate. Selection should be based on the board's footprint and assembly process, not on ADC performance, which is common to both.
Can the ADS7844NB/1K be used as a drop-in replacement for the ADS7844E/2K5 on an existing PCB?
No. Because the ADS7844NB/1K is a 20-pin PDIP and the ADS7844E/2K5 is a 20-pin SSOP, the packages have different footprints, lead pitches, and mounting methods. A direct drop-in replacement is not possible without a board redesign or an appropriate package adapter. Electrical compatibility does not imply mechanical compatibility.
Are both part numbers RoHS-compliant and available from authorized distributors?
Both the ADS7844E/2K5 and ADS7844NB/1K are Texas Instruments products and are listed by authorized distributors such as DigiKey and Mouser. RoHS/lead-free status and lifecycle information should be confirmed against the specific ordering code and the manufacturer's product page or datasheet, as compliance status can vary by ordering variant and should not be assumed without verification.