microSD Memory Cards

Secure Digital (SD) memory cards have a widespread use in industrial and automotive applications, ranging from read only applications as in navigation systems to utilization as boot media, for video recording or data logging. Swissbit’s Industrial Secure Digital (SD) card series are designed for high sustained performance and endurance and are manufactured and tested in Swissbit‘s own fab to withstand extreme environmental conditions.

The SLC based S-600u / S-250u offers highest endurance and were recently introduced to offer increased longevity. The new S-52u targets automotive and video recording applications while S-50u /S-55u targets typical high reliability use cases as seen in industrial environments. The 3D pSLC versions S-56u and especially the high endurance S-58u cards offer best cost/endurance ratio.

Series Name



S-50u / S-55u

S-56u / S-58u


Data Transfer Mode

SD 3.0, UHS-1,
speed class 10/U1

SD 6.1, UHS-I, speed class 10/U3/V30/A2
High endurance type

SD 6.1, UHS-I,
speed class 10/U3/V30/A2
High reliability type



Outline Dimensions

15 x 11 x 0.7 / 1 mm

Flash Type





Density Range

512 MB - 2 GB

32-128 GB

S-50u: 16-128 GB
S-55u: 64-256 GB

S-56u:  4-128 GB
S-58u: 16-64 GB

Data Retention

10 years @ life begin
1 year @ life end

(P/E Cycles)


3k 3k

S-56u: up to 100k
S-58u: up to 60k

Operating Temperature

Extended: -25°C to +85°C
Industrial: -40°C to +85°C

Storage Temperature

-40°C to +100°C


Sequential Read (MB/s)
Sequential Write (MB/s)
Random 4KB Read (IOPS)
Random 4KB Write (IOPS)


up to 35
up to 21
up to 850
up to 1,200


up to 95
up to 84
up to 1,960
up to 780


up to 91 / 97
up to 38 / 60
up to 2,010 / 1,970
up to 1,360 / 760


up to 95 / 97
up to 83 / 84
up to 4,950 / 3,950
up to 1,800 / 1,080


≥ 3,000,000 hours


1,500 G


50 G


85 % RH 85°C, 1,000 hrs


2.7 – 3.6 V

Use Case

Optimized for high read/write traffic for demanding industrial applications.

Optimized for seq. write use cases such as video recording, dash/body cams
Automotive type AEC-100-3

High reliability type
Optimized for random write use cases such as industrial data logging

Features & Tools

Read Disturb Management, Autonomous Data Care Management
Real industrial temperature range with full cross temperature support
Proven FW based Power Fail Safety
Manufactured in a TS 16949 certified factory
SBDMTool & SDK for detailed Life Time Monitoring

Support SD SPI mode
Proven FW based Power Fail Safety
Sophisticated Wear Leveling & Bad Block management
Autonomous Data Care Management
SBDMTool & SDK for detailed Life Time Monitoring

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).