Part A
ADS7846E
Texas Instruments
- Lifecycle
- Active
- Stock
- 5291 PCS
- Package
- SSOP-16
- Series
- Acquisição de dados - Controladores de tela de toque
Replacement verdict
Compatible functional replacement candidate
The ADS7846E and ADS7841ES/2K5 are both 12-bit successive-approximation ADCs in 16-pin SSOP packages with an SPI-compatible serial interface, making them functionally comparable in many designs. However, the ADS7846E integrates an on-chip temperature sensor and touch-screen controller with a 4-wire resistive touch interface, while the ADS7841ES/2K5 is a 4-channel single-ended input ADC without touch-screen control. Engineers should validate input configuration, reference requirements, and the absence of touch-screen functionality before substituting the ADS7841ES/2K5 for the ADS7846E in touch-sensitive applications.
Resolution and Architecture
High match
Package and Pin Configuration
High match
Input Channel Configuration
Validation required
Touch-Screen Controller Function
Not compatible
Parts at a glance
Part B
ADS7841ES/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 8265 PCS
- Package
- SSOP-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS7846E | ADS7841ES/2K5 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit SAR ADCs, so conversion resolution is equivalent for substitutability. |
| Number of Input Channels | 8 (single-ended) / 4 (differential) | 4 (single-ended) / 2 (differential) | The ADS7846 supports twice as many input channels, which affects how many signals can be multiplexed without external circuitry. |
| Interface Type | SPI (serial) | SPI (serial) | Both use a serial SPI-compatible interface, so the host microcontroller connection is functionally similar. |
| On-Chip Touch Screen Controller | Yes (includes touch screen driver/pen interrupt) | No | The ADS7846 integrates touch-screen control functions, so it cannot be directly substituted by the ADS7841 in touch applications without added circuitry. |
| Supply Voltage Range | 2.2 V to 5.25 V | 2.7 V to 5.25 V | The ADS7846 operates at a slightly lower minimum supply, which matters for low-voltage system compatibility. |
| Package | SSOP-16 (DBQ) | SSOP-16 (DBQ) | Identical package and pin count simplify board-level replacement and layout reuse. |
| Sampling Rate | 125 kSPS | 200 kSPS | The ADS7841 offers a higher maximum throughput, which matters for faster-sampling applications. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent industrial temperature range supports use in the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7846E | ADS7841ES/2K5 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Sampling Rate(Per Second) | - | 200k |
| Number of Inputs | - | 4 |
| Input Type | - | Single Ended |
| Data Interface | - | SPI |
| Configuration | - | MUX-S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | - | SAR |
| Reference Type | - | External |
| Voltage - Supply, Analog | - | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | - | 2.7V ~ 3.6V, 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Touchscreen | 4 Wire Resistive | - |
| Resolution(Bits) | 12 b | - |
| Interface | SPI | - |
| Voltage Reference | External, Internal | - |
| Voltage - Supply | 2.2V ~ 5.25V | - |
| Supply Current | 500 µA | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary functional differences between the ADS7846E and ADS7841ES/2K5?
The ADS7846E is a 4-wire resistive touch screen controller with an integrated 12-bit ADC, on-chip temperature sensor, and SPI-compatible serial interface, housed in a 16-pin SSOP package. The ADS7841ES/2K5 is a standalone 12-bit, 4-channel successive-approximation ADC with a serial interface, supplied in a 16-pin QSOP package and provided in tape-and-reel format (2K5 suffix). The ADS7846E includes touch-screen drive and sense circuitry, while the ADS7841ES/2K5 is a general-purpose ADC without touch-screen control functions.
Are the ADS7846E and ADS7841ES/2K5 pin-compatible?
No. The ADS7846E uses a 16-pin SSOP package, while the ADS7841ES/2K5 uses a 16-pin QSOP package. Although both are 16-pin devices, the package body dimensions and lead pitch differ, and the pin functions are not identical because the ADS7846E integrates touch-screen control signals (such as X+, X-, Y+, Y-, and PENIRQ) that the ADS7841ES/2K5 does not provide. Direct PCB substitution is therefore not supported without layout changes.
Can the ADS7841ES/2K5 be used as a drop-in replacement for the ADS7846E in a touch-screen application?
No. The ADS7841ES/2K5 lacks the touch-screen drive and sense circuitry, pen-interrupt output, and on-chip temperature sensor present in the ADS7846E. It cannot directly drive and measure a 4-wire resistive touch panel without external analog switching and control logic. Replacement requires additional external circuitry and firmware changes, and must be validated against the manufacturer datasheets for both devices.
What are the resolution and sampling characteristics of each device?
Both devices provide 12-bit resolution. The ADS7846E is specified for a throughput rate of up to 125 kSPS. The ADS7841ES/2K5 is specified for a throughput rate of up to 200 kSPS. Designers should confirm the exact timing and throughput specifications in the respective manufacturer datasheets for the target supply voltage and operating conditions.
What supply voltage ranges do the ADS7846E and ADS7841ES/2K5 support?
Both devices operate from a single supply in the range of 2.7 V to 5.25 V, with the digital interface compatible with common logic levels. The ADS7846E additionally supports a separate reference input and includes an on-chip temperature sensor. Exact minimum and maximum limits, as well as reference voltage requirements, should be verified in the official manufacturer datasheets.
What are the package and ordering differences between the ADS7846E and ADS7841ES/2K5?
The ADS7846E is supplied in a 16-pin SSOP package. The ADS7841ES/2K5 is supplied in a 16-pin QSOP package, and the "2K5" suffix indicates tape-and-reel packaging with 2,500 units per reel. The differing package types affect PCB land patterns and assembly processes, so the two parts are not interchangeable at the board level without layout revision.
Which device is better suited for general-purpose analog-to-digital conversion?
The ADS7841ES/2K5 is the more appropriate choice for general-purpose 4-channel 12-bit ADC applications, as it provides a higher specified throughput rate of up to 200 kSPS and a standard 4-channel multiplexed input architecture. The ADS7846E is optimized for touch-screen controller applications and includes dedicated touch-panel drive and sense functions. Selection should be based on the specific system requirements and verified datasheet parameters.