Part A
ADS7846E
Texas Instruments
- Lifecycle
- Active
- Stock
- 5291 PCS
- Package
- SSOP-16
- Series
- Acquisition de données - Contrôleur à écran tactile
Replacement verdict
Compatible functional replacement candidate
The ADS7846E is a functional replacement candidate for the ADS7843E/2K5, sharing the same TSSOP-16 footprint, SPI interface, and touch-screen controller function, but it adds on-chip temperature and battery monitoring and differs in reference and supply requirements. Designers should validate the internal reference configuration, supply voltage range, and the additional auxiliary input functions before substituting in an existing design.
Package Type
High match
Interface Type
High match
Supply Voltage Range
Validation required
Reference Configuration
Validation required
Parts at a glance
Part B
ADS7843E/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 2859 PCS
- Package
- SSOP-16
- Series
- Acquisition de données - Contrôleur à écran tactile
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS7843E/2K5 | ADS7846E | Why it matters |
|---|---|---|---|
| Resolution | 12-bit | 12-bit | Both provide 12-bit SAR conversion, so touch coordinate resolution is equivalent. |
| Touch Screen Interface | 4-wire resistive touch | 4-wire, 5-wire, and 8-wire resistive touch | The ADS7846 supports additional touch panel configurations, enabling broader panel compatibility. |
| On-chip Temperature Sensor | No | Yes | The ADS7846 includes an internal temperature sensor for system-level thermal monitoring, which the ADS7843 lacks. |
| On-chip Reference / Reference Mode | External reference only | Internal 2.5 V reference or external reference | The ADS7846 can operate with an internal reference, simplifying design and reducing external component count. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.2 V to 5.25 V | The ADS7846 supports a lower minimum supply voltage, allowing operation in lower-power or battery-constrained systems. |
| Serial Interface | SPI-compatible (12-bit) | SPI-compatible (12-bit or 8-bit) | The ADS7846 offers selectable 8-bit or 12-bit conversion results, providing flexibility for host controllers with different data width requirements. |
| Package | 16-pin SSOP (DBQ) | 16-pin SSOP (DBQ) | Identical package and pin count allow drop-in board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent industrial temperature range ensures both parts suit the same environmental conditions. |
| Pen Interrupt / Touch Detection | PENIRQ output | PENIRQ output plus auxiliary input monitoring | The ADS7846 adds auxiliary input monitoring alongside pen interrupt, offering extra system sensing capability. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7846E | ADS7843E/2K5 |
|---|---|---|
| Part Status | Active | Active |
| Touchscreen | 4 Wire Resistive | 4 Wire Resistive |
| Resolution(Bits) | 12 b | 12 b |
| Interface | SPI | Serial |
| Voltage Reference | External, Internal | External |
| Voltage - Supply | 2.2V ~ 5.25V | 2.7V ~ 5V |
| Supply Current | 500 µA | 2.5 µA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADS7843E/2K5 and the ADS7846E?
The ADS7843E/2K5 is a 4-wire resistive touch screen controller with a 12-bit SAR ADC and an SPI-compatible serial interface, supplied in a 16-pin SSOP package and shipped in 2,500-unit tape-and-reel. The ADS7846E is a 4-wire/5-wire touch screen controller that adds on-chip temperature sensing, a battery monitor input, and an auxiliary ADC input, also in a 16-pin SSOP. Both are 12-bit, 125 kSPS successive-approximation converters with SPI interfaces, but the ADS7846E integrates additional measurement channels not present on the ADS7843E.
Are the ADS7843E/2K5 and ADS7846E pin-compatible?
Both devices are offered in the same 16-pin SSOP (DBQ) package, but they are not functionally interchangeable pin-for-pin because the ADS7846E uses some pins for auxiliary functions (temperature sensor, battery monitor, and auxiliary input) that differ from the ADS7843E pinout. Designers must verify the pin function assignments against the respective manufacturer datasheets before considering any board-level substitution.
Do both devices support the same touch screen configurations?
The ADS7843E supports 4-wire resistive touch screens. The ADS7846E supports both 4-wire and 5-wire resistive touch screen configurations, selectable through its control register. Therefore, the ADS7846E offers broader touch screen compatibility, while the ADS7843E is limited to 4-wire panels.
What is the resolution and sampling rate of these controllers?
Both the ADS7843E/2K5 and the ADS7846E use a 12-bit successive-approximation ADC with a maximum throughput of 125 kSPS. These core conversion specifications are common to both devices per the manufacturer datasheets.
What additional features does the ADS7846E provide over the ADS7843E/2K5?
The ADS7846E includes an on-chip temperature sensor, a battery monitor input, and an auxiliary ADC input, in addition to the touch screen measurement channels. The ADS7843E/2K5 provides touch screen conversion only, without these auxiliary measurement functions. These extra features make the ADS7846E suitable for applications requiring system monitoring alongside touch input.
What supply voltage range do these controllers require?
Both the ADS7843E and ADS7846E operate from a single analog supply in the range of 2.7 V to 5.25 V, with a separate digital I/O supply (VCC) that supports interfacing to lower-voltage logic. Designers should confirm the exact supply and I/O voltage limits in the respective manufacturer datasheets for their specific operating conditions.
What is the difference in ordering format between ADS7843E/2K5 and ADS7846E?
The ADS7843E/2K5 suffix indicates tape-and-reel packaging in quantities of 2,500 units, suitable for automated assembly. The ADS7846E is specified as a tube or tray ordering option depending on the distributor or manufacturer listing. Buyers should confirm the packaging quantity and format with the authorized distributor before ordering.
Can the ADS7846E be used as a drop-in replacement for the ADS7843E/2K5?
No. Although both are 16-pin SSOP 12-bit touch screen controllers, the ADS7846E's additional auxiliary functions and differing pin assignments mean it is not a drop-in replacement for the ADS7843E/2K5. A redesign of the schematic and PCB layout, along with firmware changes to the control register configuration, is required when migrating between these devices.