New Semtech MICROClamp® Handset Protection Platform Offers Small Size, Low Capacitance and Power Saving Advantages

uClamp0511T and uClamp1211T Targets Smartphone Applications

Camarillo, California - May 21, 2009

Semtech Corp. (Nasdaq: SMTC), a leading supplier of analog and mixed-signal semiconductors, today announced two additions to its MICROClamp® family of protection devices, the uClamp® 0511T and the uClamp® 1211T – both of which feature the ultra low profile, low leakage and low capacitance needed for mobile phone and portable designs.

uclampxx11TBoth parts are designed to replace multilayer varistors (MLVs) in portable applications, offering the same small size with improved clamping voltage and protection. The bidirectional uClampxx11T parts are packaged in Semtech’s two-pin SLP1006P2T package measuring only 1.0 x 0.6 x 0.4 mm – a size that makes the parts appropriate for even the thinnest of designs.

Leakage current for these both devices is below a maximum of 50nA. These low-leakage parts help manufacturers reduce the power consumption of their devices, which in turn lengthens the battery life. The parts are IEC rated to protect against electro static discharge (ESD), electrical fast transients (EFT) and cable discharge effects (CDE).

The small, single-line devices are optimal for designers that need to manage their capacitance budget. Ideal applications include GPS antenna, audio lines and FM antennas. The uClamp0511T is designed for -5V/+5V power lines and the uClamp1211T for -12V/+12V power lines. Both parts have a capacitance of 4pF with a very low clamping voltage.

The parts augment Semtech’s existing MICROClamp mobile protection platform, giving system designers a wide choice of circuit protection solutions for their designs

“The small size and single line protection of the uClamp0511T and uClamp1211T give designers the flexibility to design in protection even when faced with layout constraints,” said Rick Hansen, Semtech Marketing Director for Protection Products. “The low leakage of the parts is increasingly important to smartphone designs, which have a number of power-hungry processes running, so it’s important for every part in the design to contribute to extending battery life.

Key Features of the uClampXX11T

  • Transient protection for data lines to IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact) and IEC 61000-4-4 (EFT) 40A (tp = 5/50ns), Cable Discharge Event (CDE) protection
  • Ultra-small package (1.0 x 0.6 x 0.4mm); RoHS and WEEE Compliant
  • Working voltage for uClamp0511T: - 5V /+5V; for uClamp1211T: - 12V /+12V
  • Low capacitance: 4pF typical
  • Solid-state silicon-avalanche technolog

Pricing and Availability

The uClamp0511T (order code: uClamp0511T.TCT) is priced at $0.24 each in 1,000-piece lots. The uClamp1211T (order code: uClamp1211T.TCT) is priced at $0.24 each in 1,000-piece lots. Both parts are available immediately in production quantities. Semtech offers comprehensive design assistance, including field- and factory-based support. Data sheets, volume pricing, and delivery quotes, as well as evaluation kits and samples, are available by contacting

About Semtech

Semtech Corporation is a leading supplier of analog and mixed-signal semiconductors for high-end consumer, computing, communications and industrial equipment. Products are designed to benefit the engineering community as well as the global community. The company is dedicated to reducing the impact it, and its products, have on the environment. Internal green programs seek to reduce waste through material and manufacturing control, use of green technology and designing for resource reduction. Publicly traded since 1967, Semtech is listed on the NASDAQ Global Select Market under the symbol SMTC. For more information, visit

Press Contact

Pauline Cadena, Public Relations, Telephone: (805) 389-2755


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