SFFSB39 February 2026 ISO6420
Figure 4-1 shows the ISO6420 pin diagram for the D-8 SOIC and DWV-8 Wide-SOIC packages. For a detailed description of the device pins, see the Pin Configuration and Functions section in the ISO6420 datasheet.
| Pin Name | Pin Number | Potential Failure Mode | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|---|
| VCC1 | 1 | Short-Circuited to Ground (Side-1) | The device has no power on side-1 (the supply input is shorted to ground). The outputs of OUTA and OUTB are at the default logic state. Observe that the absolute maximum ratings for all pins of the device are met; otherwise, damage to the device is possible. | A |
| VCC1 | 1 | Open-Circuited | The device has no power on side-1 (the supply input is open). The outputs of OUTA and OUTB are at the default logic state. Observe that the absolute maximum ratings for all pins of the device are met; otherwise, damage to the device is possible. | A |
| VCC1 | 1 | Short-Circuited to Pin2 (INA) | The input signal is shorted to ground, so the output of OUTA is stuck low. Communication through channel A is corrupted. | B |
| VCC1 | 1 | Short-Circuited to Supply (Side-1) | The device continues to function as expected. Normal operation. | D |
| INA | 2 | Short-Circuited to Ground (Side-1) | The input signal is shorted to ground, so the output of OUTA is stuck low. Communication through channel A is corrupted. | B |
| INA | 2 | Open-Circuited | Communication through channel A is not possible. The output of OUTA is at the default state (weak internal pullup or pulldown to the default state). | B |
| INA | 2 | Short-Circuited to Pin3 (INB) | Communication is corrupted for either or both channels. | B |
| INA | 2 | Short-Circuited to Supply (Side-1) | The input signal is shorted to supply, so the output of OUTA is stuck high. Communication through channel A is corrupted. | B |
| INB | 3 | Short-Circuited to Ground (Side-1) | The input signal is shorted to ground, so the output of OUTB is stuck low. Communication through channel B is corrupted. | B |
| INB | 3 | Open-Circuited | Communication through channel B is not possible. The output of OUTB is at the default state (weak internal pullup or pulldown to the default state). | B |
| INB | 3 | Short-Circuited to Pin4 (GND1) | The input signal is shorted to ground, so the output of OUTB is stuck low. Communication through channel B is corrupted. | B |
| INB | 3 | Short-Circuited to Supply (Side-1) | The input signal is shorted to supply, so the output of OUTA is stuck high. Communication through channel A is corrupted. | B |
| GND1 | 4 | Short-Circuited to Ground (Side-1) | The device continues to function as expected. Normal operation. | D |
| GND1 | 4 | Open-Circuited | There is no power to the device on side-1 (ground is open). OUTA and OUTB outputs are at the default logic state. Observe that the absolute maximum ratings for all pins of the device are met; otherwise, damage to the device is possible. | A |
| GND1 | 4 | Short-Circuited to Pin5 (N/A) | Not applicable (N/A), corner pin. | N/A |
| GND1 | 4 | Short-Circuited to Supply (Side-1) | The device has no power on side-1 (the supply input is shorted to ground). The outputs of OUTA and OUTB are at the default logic state. Observe that the absolute maximum ratings for all pins of the device are met; otherwise, damage to the device is possible. | A |
| GND2 | 5 | Short-Circuited to Ground (Side-2) | The device continues to function as expected. Normal operation. | D |
| GND2 | 5 | Open-Circuited | There is no power to the device on side-2 (ground is open). The output states of OUTA and OUTB are undetermined. Observe that the absolute maximum ratings for all pins of the device are met; otherwise, damage to the device is possible. | A |
| GND2 | 5 | Short-Circuited to Pin6 (OUTB) | The output of OUTB is shorted to ground. Communication through channel B is corrupted. Damage to the device is possible if INB is driven high for an extended period of time. | A |
| GND2 | 5 | Short-Circuited to Supply (Side-2) | The device has no power on side-2 (the supply input is shorted to ground). The output states of OUTA and OUTB are undetermined. Observe that the absolute maximum ratings for all pins of the device are met; otherwise, damage to the device is possible. | A |
| OUTB | 6 | Short-Circuited to Ground (Side-2) | The output of OUTB is shorted to ground. Communication through channel B is corrupted. Damage to the device is possible if INB is driven high for an extended period of time. | A |
| OUTB | 6 | Open-Circuited | The state of the OUTB output is undetermined. Communication through channel B is corrupted. | B |
| OUTB | 6 | Short-Circuited to Pin7 (OUTA) | Communication is corrupted for either channel or both channels. With an opposite logic state on both channels, high current can flow between the pins, supply, and ground and possibly cause damage to the device. | A |
| OUTB | 6 | Short-Circuited to Supply (Side-2) | The output of OUTB is stuck high. Communication through channel B is corrupted. Device damage is possible if INB is driven low for an extended period of time. | A |
| OUTA | 7 | Short-Circuited to Ground (Side-2) | The output of OUTA is shorted to ground. Communication through channel A is corrupted. Damage to the device is possible if INA is driven high for an extended period of time. | A |
| OUTA | 7 | Open-Circuited | The state of the OUTA output is undetermined. Communication through channel A is corrupted. | B |
| OUTA | 7 | Short-Circuited to Pin8 (VCC2) | The output of OUTA is stuck high. Communication through channel A is corrupted. Device damage is possible if INA is driven low for an extended period of time. | A |
| OUTA | 7 | Short-Circuited to Supply (Side-2) | The output of OUTA is stuck high. Communication through channel A is corrupted. Device damage is possible if INA is driven low for an extended period of time. | A |
| VCC2 | 8 | Short-Circuited to Ground (Side-2) | The device has no power on side-2 (the supply input is shorted to ground). The output states of OUTA and OUTB are undetermined. Observe that the absolute maximum ratings for all pins of the device are met; otherwise, damage to the device is possible. | A |
| VCC2 | 8 | Open-Circuited | The device has no power on side-2 (the supply input is open).The output states of OUTA and OUTB are undetermined. Observe that the absolute maximum ratings for all pins of the device are met; otherwise, damage to the device is possible. | A |
| VCC2 | 8 | Short-Circuited to Pin1 (N/A) | Not applicable (N/A), corner pin. | N/A |
| VCC2 | 8 | Short-Circuited to Supply (Side-2) | The device continues to function as expected. Normal operation. | D |