How the Input Voltage Affects Solid State Drive

August 5, 2020 Maxine He, Renice Industrial & Military Grade SSD & Computer Sales support Specialist

Intelligent transportation systems (ITS), passenger information systems (PIS), and other in-vehicle applications such as video surveillance and data recording sometimes produce an unstable voltage supply. Embedded SSDs can be negatively impacted by these unstable input voltages.

So, how exactly does input voltage affect the NAND Flash of SSD?

Here, raw-bit error rate (RBER) is of importance. RBER is the bit error rate before error correction code (ECC), and it reflects the initial reliability of NAND flash. The higher the RBER, the less reliable the NAND flash.

To illustrate this point, five examples are given below, each of which has a 0.3V voltage fluctuation.

Figure 1. Our control graph shows a 3.3V to 3.6V power supply to the NAND flash, fluctuating across the 0.3V offset.

 

Figure 2. When set to the standards NAND flash voltage range of 2.7V to 3.0V, the RBER is 10^(-5.850, which is in the normal range.

 

Figure 3. When receiving a 3.6V to 3.9V input, REBER increases to 10^-5.845.

 

Figure 4. When voltage increases to 3.9V to 4.2V, RBER increases to 10^(-5.832).
 
Figure 5. When setting the supply voltage to 4.2V to 4.5V, the RBER continues increasing up to 10^ (-5.823).

As stated, in general the higher the input voltage, the higher the RBER, and the greater the impact on SSD performance.

Renice’s SSD solutions are designed using specialized circuits tailored to each SSD's acceptable voltage ranges, which ensure performance and reliability in extreme or harsh environments.

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