SFFSA44 December   2024 OPA991-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 SOT-23 (DBV) - 5 Package
    2. 2.2 SOT-23 (DBV) - 6 Package
    3. 2.3 SOT-SC70 (DCK) - 5 Package
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 SOT-23 (DBV) - 5 Package
    2. 4.2 SOT-SC70 (DCK) - 5 Package
    3. 4.3 SOT-23 (DBV) - 6 Package
  7. 5Revision History

4.2 SOT-SC70 (DCK) - 5 Package

Figure 4-2 shows the OPA991-Q1 pin diagram for the SOT-SC70 (DCK) - 5 package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the OPA991-Q1 data sheet.

Figure 4-2 Pin Diagram (SOT-SC70 (DCK) - 5 Package)
Table 4-6 Pin FMA for Device Pins Short-Circuited to Ground
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
IN+ 1 Device common-mode is tied to the negative rail. Depending on the circuit configuration, the output does not respond because the device is in an invalid, common-mode condition. C
IN‒ 3 The device does not receive negative feedback. Depending on the circuit configuration, the output moves to the negative supply. B
OUT 4 Depending on the circuit configuration, the device is forced into a short-circuit condition with the OUT voltage ultimately forced to the V‒ voltage. Prolonged exposure to short-circuit conditions can result in long-term reliability issues. A
V+ 5 Op amp supplies are shorted together, leaving the V+ pin at some voltage between the V+ and V‒ sources (depending on the source impedance). A
Table 4-7 Pin FMA for Device Pins Open-Circuited
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
IN+ 1 Device common-mode is disconnected. The op amp is not provided with common-mode bias, and the device output results at the positive or negative rail. The IN+ pin voltage results at the positive or negative rail because of leakages on the ESD diodes. B
V‒ 2 Negative supply remains floating. The op amp ceases to function because no current can source or sink to the device. B
IN‒ 3 Inverting pin of the op amp is left floating. Negative feedback is not provided to the device, resulting in the device output moving between the positive and negative rails. The IN‒ pin voltage ends up at the positive or negative rail because of leakages on the ESD diodes. B
OUT 4 No negative feedback or ability for OUT to drive the application. B
V+ 5 Positive supply is left floating. The op amp ceases to function because no current sources or sinks to the device. A
Table 4-8 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin Name Pin No. Shorted to Description of Potential Failure Effects Failure Effect Class
IN+ 1 V‒ Device common-mode is tied to the negative rail. Depending on the circuit configuration, the output does not respond because the device is in an invalid common-mode condition. C
V‒ 2 IN‒ The device does not receive negative feedback. Depending on the circuit configuration, the output moves to the negative supply. B
IN‒ 3 OUT Depending on the circuit configuration, the circuit gain is reduced to unity gain, and the application can not function as intended. B
OUT 4 V+ Depending on the circuit configuration, the device is likely to be forced into a short-circuit condition with the OUT voltage ultimately forced to the V+ voltage. Prolonged exposure to short-circuit conditions can result in long-term reliability issues. A
V+ 5 IN+ Depending on the circuit configuration, the application is likely not to function because device common-mode voltage is connected to V+. B
Table 4-9 Pin FMA for Device Pins Short-Circuited to Supply
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
IN+ 1 Depending on the circuit configuration, the application does not function because device common-mode voltage is connected to IN+. B
V‒ 2 Op amp supplies are shorted together, leaving the V‒ pin at a voltage amount between the V‒ and V+ sources (depending on the source impedance). A
IN‒ 3 The device does not receive negative feedback. Depending on the noninverting input voltage and circuit configuration, the output can move to the negative supply. B
OUT 4 Depending on the circuit configuration, the device is forced into a short-circuit condition with the OUT voltage forced to the V+ voltage. Prolonged exposure to short-circuit conditions can result in long-term reliability issues. A