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

4.1 SOT-23 (DBV) - 5 Package

Figure 4-1 shows the OPA991-Q1 pin diagram for the SOT-23 (DBV) - 5 package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the OPA991-Q1 data sheet.

Figure 4-1 Pin Diagram (SOT-23 (DBV) - 5) Package
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
OUT 1 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
IN+ 3 Device common-mode is tied to the negative rail. Depending on the circuit configuration, the output can not respond because the device is in an invalid common-mode condition. C
IN‒ 4 The device does not receive negative feedback. Depending on the circuit configuration, the output can move to the negative supply. B
V+ 5 Op amp supplies are shorted together, leaving the V+ pin at a voltage between the V+ and V‒ sources (depending on the source impedance). A
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No.Description of Potential Failure EffectsFailure Effect Class
OUT1No negative feedback or ability for OUT to drive the application.B
V‒2Negative supply is left floating. The op amp ceases to function because no current can source or sink to the device.B
IN+3Device common-mode is disconnected. The op amp is not provided with common-mode bias, and the device output can result at the positive or negative rail. The IN+ pin voltage can result at the positive or negative rail because of leakages on the ESD diodes.B
IN‒4Inverting pin of the op amp is left floating. Negative feedback is not provided to the device and can result in the device output moving between the positive and negative rails. The IN‒ pin voltage likely ends up at the positive or negative rail because of leakage on the ESD diodes.B
V+5Positive supply is left floating. The op amp ceases to function because no current can source or sink to the device.A
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin Name Pin No. Shorted to Description of Potential Failure Effects Failure Effect Class
OUT 1 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‒ 2 IN+ Device common-mode is tied to the negative rail. Depending on the circuit configuration, the output likely does not respond because the device is in an invalid common-mode condition. C
IN+ 3 VIN‒

Both inputs are tied together. Depending on the offset of the device, the output voltage can move to near midsupply.

 D
IN‒ 4 V+ 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
V+ 5 OUT Depending on the circuit configuration, the device is forced into a short-circuit condition with the V+ voltage forced to the OUT voltage. Prolonged exposure to short-circuit conditions can result in long-term reliability issues. A
Table 4-5 Pin FMA for Device Pins Short-Circuited to Supply
Pin NamePin No.Description of Potential Failure EffectsFailure Effect Class
OUT1Depending on the circuit configuration, the device can 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‒2Op amp supplies are shorted together, leaving the V‒ pin at some voltage between the V‒ and V+ sources (depending on the source impedance).A
IN+3Depending on the circuit configuration, the application can not function because device common-mode voltage is connected to IN+.B
IN‒4The device does not receive negative feedback. Depending on the noninverting input voltage and circuit configuration, the output can move to the negative supply.B