Part A
ADS7843E/2K5
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2859 個数
- Package
- SSOP-16
- Series
- データ取得 - タッチスクリーンコントローラ
Replacement verdict
Not a drop-in replacement
The ADS7843E/2K5 and ADS7841E/2K5G4 are not drop-in replacements for one another. Although both are 12-bit SAR ADCs in the same 16-pin SSOP package, they differ fundamentally in input architecture, interface protocol, and channel configuration, requiring board-level redesign and firmware changes before substitution can be considered.
Different input architecture
Different interface protocol
Different channel configuration
Different conversion control
Parts at a glance
Part B
ADS7841E/2K5G4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 5974 個数
- Package
- SSOP-16
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADS7843E/2K5 | ADS7841E/2K5G4 | Why it matters |
|---|---|---|---|
| Resolution | 12-bit | 12-bit | Both are 12-bit, so resolution is not a differentiator for substitutability. |
| Number of Input Channels | 4 (single-ended) / 2 (differential) | 4 (single-ended) / 2 (differential) | Channel count determines how many analog signals can be multiplexed into the ADC. |
| Interface Type | SPI (serial) | SPI (serial) | Both use a serial SPI interface, so host microcontroller compatibility is similar. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges allow the parts to operate in the same system power domain. |
| Sampling Rate | 125 kSPS | 200 kSPS | A higher sampling rate supports faster signal acquisition and may matter for higher-bandwidth inputs. |
| Internal Reference | No (external reference required) | No (external reference required) | Both require an external reference, so the reference design must be provided in either case. |
| Package / Mounting | 16-pin SSOP, surface mount | 16-pin SSOP, surface mount | Identical package and footprint enable direct board-level substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges ensure both parts suit the same environmental conditions. |
| Power Consumption | Low power (typical ~0.5 mW at 2.7 V) | Low power (typical ~0.9 mW at 5 V) | Power draw affects battery life and thermal budget in portable and embedded designs. |
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 | ADS7843E/2K5 | ADS7841E/2K5G4 |
|---|---|---|
| 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 | Serial | - |
| Voltage Reference | External | - |
| Voltage - Supply | 2.7V ~ 5V | - |
| Supply Current | 2.5 µA | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the key differences between the ADS7843E/2K5 and the ADS7841E/2K5G4?
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 delivered on a 2,500-unit tape and reel. The ADS7841E/2K5G4 is a 12-bit, 4-channel SAR ADC with an SPI-compatible serial interface, supplied in a 16-pin SSOP package and delivered on a 2,500-unit tape and reel in Green (Pb-free/RoHS-compliant) construction. The ADS7843 is optimized for touch screen digitizer applications with integrated pen-interrupt and touch-drive control, while the ADS7841 is a general-purpose 4-channel ADC without touch screen control logic.
Are the ADS7843E/2K5 and ADS7841E/2K5G4 pin-compatible?
Both devices are offered in the same 16-pin SSOP package, but they are not functionally interchangeable. The ADS7843 includes touch screen control functions (such as pen-interrupt output and touch-drive switching) that the ADS7841 does not provide, and the pin functions differ accordingly. Designers must verify pin assignments against the respective manufacturer datasheets before considering any layout reuse.
What is the resolution and architecture of each device?
Both the ADS7843E/2K5 and the ADS7841E/2K5G4 use a 12-bit successive-approximation register (SAR) ADC architecture. The ADS7843 provides 12-bit resolution for touch screen coordinate measurement, and the ADS7841 provides 12-bit resolution across its four analog input channels.
What serial interface do these devices use?
Both devices use an SPI-compatible serial interface for communication with a host microcontroller or processor. The interface supports standard serial clock, chip select, and data input/output signals as defined in the respective manufacturer datasheets.
What are the analog input configurations of the ADS7843E/2K5 and ADS7841E/2K5G4?
The ADS7843 is designed for 4-wire resistive touch screen panels and measures X and Y coordinates through its touch screen drive and sense arrangement. The ADS7841 provides four analog input channels that can be configured as single-ended or differential inputs, making it suitable for general-purpose multi-channel data acquisition rather than dedicated touch screen control.
What does the "2K5" suffix and the "G4" suffix indicate?
The "2K5" suffix on both part numbers indicates tape-and-reel packaging in quantities of 2,500 units. The "G4" suffix on the ADS7841E/2K5G4 indicates Green (Pb-free and RoHS-compliant) construction as defined by the manufacturer. The ADS7843E/2K5 part number as stated does not carry the G4 suffix.
Can the ADS7841E/2K5G4 be used as a drop-in replacement for the ADS7843E/2K5 in a touch screen design?
No. The ADS7841E/2K5G4 lacks the touch screen drive and pen-interrupt control functions of the ADS7843E/2K5, so it cannot directly replace the ADS7843 in a resistive touch screen digitizer design. A replacement requires validating the functional differences against the manufacturer datasheets and the target design requirements.
What supply voltage range do these devices support?
Both the ADS7843 and ADS7841 are specified for single-supply operation in the 2.7 V to 5 V range, as documented in their respective manufacturer datasheets. Designers should confirm the exact specified range and any derating conditions in the latest datasheet revision for the target design.