ADG7421F
RECOMMENDED FOR NEW DESIGNSLow Voltage Fault Protection and Detection, 12 Ω RON, Dual SPST Switch
- Part Models
- 1
- 1ku List Price
- Starting From $2.41
Overview
- Overvoltage fault protection up to ±60 V on S1 and S2 pins
- Power-off protection up to ±60 V on S1 and S2 pins
- Overvoltage detection on S1 and S2 pins
- Known state output without digital inputs present
- Low on resistance: 12 Ω typical
- Ultraflat, on resistance: 0.005 Ω typical
- Low fault detection threshold voltage: 0.1 V typical
- 3 kV HBM ESD rating
- Latch-up immune under any circumstance
- ±1.8 V to ±2.5 V dual supply operation
- 1.8 V to 5.5 V single-supply operation
- 10-Lead, 3 mm × 2 mm LFCSP
The ADG7421F is a low voltage, dual single-pole/single-throw (SPST), low on-resistance switch that features overvoltage protection, power-off protection, and overvoltage detection on the source pins.
When no power supplies are present, the switch remains in the off condition, and the switch inputs are high impedance. When powered, if the analog input signal levels on the Sx pins exceed VDD or VSS by a threshold voltage, VT, the switch automatically turns off and the digital FF (fault flag) pin drops to a logic low to indicate a fault.
Input signal levels up to +60 V or −60 V relative to ground are blocked, in both the powered and unpowered condition. The switches turn on with a Logic 1 input and conducts equally well in both directions with an analog signal range of VSS + 0.1 V to VDD − 0.55 V for a 5 V single supply. The digital input is compatible with 1.8 V logic inputs over the full operating supply range.
The ADG7421F is ideal for providing overvoltage protection for small signals such as resistance temperature device (RTD) inputs (see Figure 56 in the data sheet) and thermocouple inputs (see Figure 55). The ability to protect against high voltages up to ±60 V coupled with a low voltage supply can enable complete low voltage input stages for industrial applications.
APPLICATIONS
- Analog input/output modules
- Process control/distributed control systems
- Data acquisition
- Instrumentation
- Avionics
- Automatic test equipment
- Communication systems
- Relay replacement
Documentation
Data Sheet 1
User Guide 1
Video 1
Analog Dialogue 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| ADG7421FBCPZ-RL7 | 10-Lead LFCSP (3mm x 2mm x 0.75mm) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Analog to Digital Converters (ADCs) 2 | ||
| AD7124-8 | RECOMMENDED FOR NEW DESIGNS | 8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference |
| AD7124-4 | RECOMMENDED FOR NEW DESIGNS | 4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference |
| LDO Linear Regulators 1 | ||
| ADP162 | PRODUCTION | Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- ADG7421F
IBIS Model 1
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
Evaluating the ADG7421F Low Voltage Fault Protection and Detection, 12 Ω RON, Dual SPST Switch