microSD Memory Cards

The latest Micro SD memory card series S-30u and S-50u are based on 3D NAND TLC and offer best cost efficiency. The S-30u is targeting highly cost sensitive read mostly applications while the S-50u is a true industrial SD Card for all use cases. For high endurance demand the pSLC version S-56u is the ideal solution. These cards support Class 10, U3 mode.

The continued 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 1,400 IOPS.

The special firmware features of the new 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 3.0, Class 10, UHS-I

SD 6.1, Class 10, UHS-I, V30, A1

SD 6.1, Class 10, UHS-I, A1



Outline Dimensions

15 x 11 x 0.7 / 1 mm

Flash Type


S-46u: pSLC
S-45u: MLC / 3D MLC



Density Range

S-250u: 512 MB -2 GB
S-300u: 1 GB -8 GB

512 MB-8 GB

S-46u: 2-64 GB
S-45u: 4-128 GB

32-256 GB

S-56: 4-32 GB
S-50: 16-128 GB

Data Retention

10 years @ life begin

1 year @ life end

(Flash Cell Level)

100k P/E Cycles
TO part number

60k P/E
MT part number

20k / 3k P/E Cycles

endurance optimized

1k P/E Cycles

30k / 3k P/E Cycles

Operating Temperature

Extended: -25°C to +85°C

Industrial: -40°C to +85°C

Extended: -25°C to +85°C

-25°C to +85°C

-40°C to +85°C

Storage Temperature

-40°C to +85°C

-40°C to +100°C

-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 19 / 24 / 24
up to 21 / 11 / 22
up to - / 1,580 / -
up to - / 29 / -


up to 40 / 30
up to 28 / 24
up to 1,280 / 1,200
up to 1,540 / 28


up to 42 / 44
up to 40 / 19
up to 1,400 / 1,350
up to 1,250 / 950


up to 95
up to 85
up to 1,700
up to 1,050


typ 95 / 91
typ 84 / 38
typ 2,050 / 2,010
typ 920 / 1,360


≥ 3,000,000 hours


1,500/1,000 G

1,500 G


50 / 15 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 30 / 50 mA
Write typ 40 / 50 mA

Read typ 50 mA
Write typ 60 mA

Read typ 75 mA
Write typ 80 mA

Read typ 80 mA
Write typ 100 mA

Read typ 110 mA
Write typ 110 mA

Features & Tools

Proven Power Fail Safety

Advanced Wear Leveling & Bad Block management

S-450u block based FTL /
S-455u, S-45u, S-46u page based FTL
Proven Power Fail Safety
Sophisticated Wear Leveling & Bad Block management
Autonomous Data Care Management
SBLTM Tool & SDK for detailed Life Time Monitoring

Support SD SPI mode
Static and Dynamic
Wear Leveling
Bad Block Management
Auto-Read Refresh
Embedded Mode

Support SD SPI mode
Proven Power Fail
Sophisticated Wear
Leveling & Bad Block
Autonomous Data Care
SBLTM Tool & SDK for
detailed Life Time

Conformal coating
Conformal Coating

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

Data care management
Data Care Management

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.

Electrostatic discharge and electromagnetic interference
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)
Life time monitoring (LTM)

The Swissbit Life Time Monitoring feature enables users to access the memory device’s detailed Life Time Status and allows prediction of 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 & Recovery
Power fail protection

Intelligent Power Fail Protection and 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.

Shock & Vibration
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.

Write Amplification Factor
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
Wear leveling

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

Wide temperature support
Wide temperature support

Swissbit‘s embedded memory and 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).