Toshiba Semiconductor and Storage CMS08(TE12L,Q,M)

Overview

CMS08(TE12L,Q,M) from Toshiba is a Schottky barrier diode optimized for high-efficiency, low-voltage DC-DC conversion, RF rectification in switching regulators, and reverse-current protection in mobile devices. It features a 30 V repetitive peak reverse voltage (VRRM), 1.0 A average forward current (IF(AV)), and a low 0.37 V maximum forward voltage (VFM) at 1.0 A, enabling minimal conduction loss in compact power designs.

For engineers reviewing the CMS08(TE12L,Q,M) datasheet, CMS08(TE12L,Q,M) pinout, CMS08(TE12L,Q,M) application, or CMS08(TE12L,Q,M) equivalent, key selection criteria include thermal resistance (Rth(j-a) = 60 °C/W on ceramic board), junction capacitance (Cj = 70 pF at 10 V), and trade-off between low VF and controlled IRRM for stable operation under high-temperature bias conditions.

Technical Context

The CMS08(TE12L,Q,M) employs a planar Schottky barrier structure with a metal–semiconductor junction optimized for fast switching and low forward drop. Its 70 pF junction capacitance at 10 V and 1 MHz supports high-frequency rectification up to RF bands, while its VF–IRRM trade-off design prioritizes conduction efficiency over ultra-low leakage.

Thermal performance is defined for two mounting configurations: Rth(j-a) = 60 °C/W on a 50 mm × 50 mm ceramic board with 2 mm × 2 mm solder land, and 135 °C/W on glass-epoxy with 6 mm × 6 mm land. Junction temperature must be limited to ≤125 °C, with derating recommended to ≤100 °C for long-term reliability.

Key Specifications

Pinout & Package

Package: 3-4E1S (Toshiba M-FLAT™ surface-mount package, 2.1 mm × 1.4 mm × 0.9 mm, weight 0.023 g). Compliant with JEITA and JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky diode applications.

Compared with CMS08(TE12L,Q,M), RB050M-30TR offers higher reverse voltage safety margin at the cost of increased forward loss and board area, while SS12 trades off both VF and Cj for lower cost - making CMS08(TE12L,Q,M) optimal for space-constrained, high-efficiency, high-frequency mobile power designs.

Availability

CMS08(TE12L,Q,M) is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, RF rectification in switching regulators, and reverse-current protection in mobile devices requiring stable component supply and consistent thermal performance across production batches.

Supply support for CMS08(TE12L,Q,M) includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs with emphasis on energy efficiency, miniaturization, and automotive-grade reliability.

The CMS08(TE12L,Q,M) belongs to Toshiba's M-FLAT™ Schottky diode product line, engineered specifically for high-density, low-voltage power management in portable and battery-powered equipment where thermal and space constraints are critical.

FAQ

What is the maximum junction temperature for CMS08(TE12L,Q,M)?

The absolute maximum junction temperature (Tj) for CMS08(TE12L,Q,M) is 125 °C. However, Toshiba recommends limiting Tj to ≤100 °C under worst-case operating conditions to ensure long-term reliability. This derating accounts for thermal resistance variations due to PCB layout, solder land size, and ambient temperature gradients. The CMS08(TE12L,Q,M) datasheet provides detailed Ta–IF(AV) derating curves for both ceramic and glass-epoxy board mounting configurations.

Is CMS08(TE12L,Q,M) suitable for RF rectification applications?

Yes, CMS08(TE12L,Q,M) is explicitly qualified for radio-frequency rectification in switching regulators. Its 70 pF junction capacitance at 10 V and 1 MHz, combined with fast intrinsic recovery, enables clean waveform rectification up to ~100 MHz. Application notes confirm its use in envelope detection and high-frequency synchronous rectification circuits where low Cj and predictable VF–IR trade-offs are essential - a key advantage of the CMS08(TE12L,Q,M) over general-purpose Schottky diodes.

What does the marking "S8" indicate on CMS08(TE12L,Q,M)?

The marking "S8" on the top surface of CMS08(TE12L,Q,M) is Toshiba's standardized abbreviation code identifying the device as the CMS08 Schottky barrier diode in the 3-4E1S M-FLAT™ package. This marking is used for traceability and visual identification during assembly and inspection. It appears alongside the part number "CMS08" on the device body and corresponds to the ordering code CMS08(TE12L,Q,M), confirming full compliance with Toshiba's original specification and manufacturing lot control for the CMS08(TE12L,Q,M).

How does thermal resistance vary with PCB mounting for CMS08(TE12L,Q,M)?

CMS08(TE12L,Q,M) exhibits significantly different thermal resistance depending on PCB construction: Rth(j-a) = 60 °C/W on a 50 mm × 50 mm ceramic board with 2 mm × 2 mm solder land, versus 135 °C/W on a glass-epoxy board with 6 mm × 6 mm land. This 2.25× difference means thermal design must match the actual board material and land geometry. The CMS08(TE12L,Q,M) datasheet specifies both configurations - using the wrong reference value risks junction overheating and premature failure.

Can CMS08(TE12L,Q,M) replace a standard silicon diode in a 5 V buck converter?

Yes, CMS08(TE12L,Q,M) is a direct functional replacement for standard silicon diodes in 5 V buck converters, delivering measurable efficiency gains. With a maximum VFM of 0.37 V at 1.0 A versus ~0.6–0.7 V for typical silicon diodes, the CMS08(TE12L,Q,M) reduces conduction loss by ~40%, lowering die temperature and improving light-load efficiency. Its 30 V VRRM provides adequate margin for 5 V systems, and its 25 A IFSM handles startup surges - all confirmed in Toshiba's CMS08(TE12L,Q,M) application guidance for DC-DC power stages.