microSD Memory Cards

Do you have questions?

The latest Micro SD memory card series S-45u (MLC version), S-46u (pSLC version), S-450u (SLC) and S-455u (SLC version)include the same set of sophisticated features and, through the implementation of UHS-I, support data transfer rates of up to 48 MB/s. The combination of MLC (Multi Level Cell) NAND Flash with an innovative controller and page based firmware technology enables prolonged data retention and extended life cycles despite the write endurance limitations of MLC Flash.The S-45u, S-46u and S-455u Micro SD memory cards excel with a random write data rate of up to 1400 IOPS.

The special firmware features in the S-4xu series include a powerful built-in Error Correction, Read Retry, Autonomous Data Care Management, Life Time Monitoring & diagnostic features, Randomizer, Wear Leveling & Bad Block Management algorithms and intelligent Power Fail Protection.

All Swissbit Micro SD Cards can withstand extreme environmental conditions. They provide the highest level of mechanical stability and enhanced ESD protection. Furthermore, the hard gold Micro SD connectors endure a minimum of 20,000 insertion cycles.

Series Name








Data Transfer Mode

SD 2.0, Class 6 / 10

SD 2.0, Class 6


SD 3.0, Class 10, UHS-I




Outline Dimensions

15 x 11 x 0.7 / 1 mm

Flash Type



MLC durabit


Density Range

1 GB – 2 GB (SD)

4 GB – 8 GB (SDHC)

512 MB – 2 GB (SD)

2 GB (SD)

4 GB – 16 GB (SDHC)

4 GB – 32 GB (SDHC)

512 MB – 2 GB (SD)

4 GB – 8 GB (SDHC)

Data Retention

10 years @ life begin

1 year @ life end

(Flash Cell Level)

100,000 P/E Cycles

20,000 P/E Cycles

endurance optimized

3,000 P/E Cycles

endurance optimized

100,000 P/E Cycles

Operating Temperature

Extended: -25°C to +85°C

Industrial: -40°C to +85°C

Storage Temperature

-40°C to +85°C

-40°C to +100°C


Sequential Read (MB/s)

Sequential Write (MB/s)

Random 4KB Read (IOPS)

Random 4KB Write (IOPS)

up to 25

up to 24


up to 25

up to 21



up to 48

up to 48

up to 1350

up to 1400


up to 33

up to 14

up to 750

up to 850


up to 30

up to 24

up to 1200

up to 30


up to 40

up to 28

up to 1200

up to 1430


≥ 3,000,000 hours


1,500 G


50 G


93 % RH 40°C, 500 hrs

85 % RH 85°C, 1,000 hrs


2.7 – 3.6 V Normal

Power Consumption

Read typ 50 mA
Write typ 50 mA

Read typ 30 mA

Write typ 40 mA

Read typ 75 mA

Write typ 80 mA

Read typ 50 mA

Write typ 60 mA

Read typ 65 mA

Write typ 70 mA

Features & Tools

Proven Power Fail Safety

Advanced Wear Leveling & Bad Block management

Proven Power Fail Safety

Sophisticated Wear Leveling & Bad Block management

Diagnostic features

Life Time Monitoring

Proven Power Fail Safety

Sophisticated Wear Leveling & Bad Block management

Autonomous Data Care Management

SBLTM Tool & SDK for detailed Life Time Monitoring

Part Number





Product Features

Conformal Coating

Swissbit offers a special protective coating on selected products. This coating is a thin polyurethane film which protects against aggressive environmental conditions such as dust, moisture or corrosive gas.

Data Care Managment

Various effects like data retention, read disturb limits or temperature can impact data reliability. The latest generation of Swissbit products use special methods to maintain and refresh the data for higher data integrity.

ESD and EMI safe

The product designs are in line with the latest regulations for electrostatic discharge and electromagnetic interference. Swissbit strives to exceed these limits with our own in-house technology and production capabilities, for example with System-in-Package (SiP) competence.

Life time monitoring (LTM)

The Swissbit Life Time Monitoring feature enables users to access the memory device’s detailed Life Time Status and allows predicting imminent failure avoiding unexpected data loss. This feature uses an extended S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) interface or vendor specific commands to retrieve the Flash product information.


The longevity product lines use special components with a long-term supply commitment of up to 10 years. These products offer lowest TCO in demanding applications with high requalification cost.

Power fail protection

Intelligent Power Fail Protection & Recovery protects data from unexpected power loss. During an unintentional shutdown, firmware routines and an intelligent hardware architecture ensure that all system and user data will be stored to the NAND.

Read only optimized

In many industrial applications the data is written to the NAND Flash once and is only read afterwards. For such cases the firmware can be optimized in order to guarantee highest possible data retention and less read disturb.

Shock and vibration

Robustness is one of our key specification targets. The design, assembly and use of selected materials guarantee an extremely solid design which has been validated by extensive testing.

WAF reduction

The WAF (write amplification factor) for MLC based products is reduced by combining a paged based FW block management with a powerful card architecture and configuration settings.

Wear leveling

Sophisticated Wear Leveling & Bad Block Management ensure that Flash cells are sparingly and equally used in order to prolong life time of the device.

Wide temperature support

Swissbit‘s embedded memory & storage solutions are designed and approved for reliable operation over a wide temperature range. The products are verified at temperature corners and prestressed with a burn-in operating functional test (Test During Burn In – TDBI).

Get our Newsletter

What is the sum of 8 and 7?