Toshiba Semiconductor and Storage CMS03(TE12L)

Overview

CMS03(TE12L) from TOSHIBA is a surface-mount Schottky barrier rectifier optimized for high-efficiency DC/DC conversion in compact power supplies, delivering 3 A average forward current with low 0.45 V peak forward voltage at 3 A and 30 V repetitive peak reverse voltage. It is widely used in switching mode power supplies and portable battery-powered equipment where thermal performance and space constraints are critical.

For engineers reviewing the CMS03(TE12L) datasheet, CMS03(TE12L) pinout, CMS03(TE12L) application, or CMS03(TE12L) equivalent, key selection criteria include its 30 V V_RRM, 3 A I_F(AV), 0.45 V V_FM (max), 190 pF junction capacitance, and M-FLAT™ package thermal resistance of 60 °C/W on ceramic board - all critical for low-loss, high-density SMPS and battery charging designs.

Technical Context

The CMS03(TE12L) employs a planar Schottky barrier structure to minimize forward conduction loss and reverse recovery time, enabling high-frequency operation without minority-carrier storage delay. Its low V_FM (0.42 V typ. at 3 A) and low R_th(j-a) (60 °C/W) support efficient thermal management in constrained layouts.

Designed for unidirectional power conversion, it operates with no gate control or bias circuitry, requiring only proper PCB land pattern (2 mm × 2 mm) and thermal pad design per Toshiba's M-FLAT™ mounting guidelines. Reverse leakage remains under 500 µA at 30 V and 25°C, balancing low-loss conduction with acceptable blocking integrity.

Key Specifications

Pinout & Package

The CMS03(TE12L) uses Toshiba's M-FLAT™ surface-mount package (JEITA code 3-4E1A), measuring 3.0 × 1.4 × 1.4 mm with a single thermal pad on the cathode side for enhanced heat dissipation. It is a 2-terminal device with anode and cathode leads exposed on opposite edges of the molded body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RB050M-30TR and SS33HE3/57T, the CMS03(TE12L) delivers superior thermal performance (60 °C/W), lower forward voltage (0.45 V), and a smaller footprint - making it optimal for next-generation compact, high-efficiency SMPS where junction temperature control and board area are critical.

Availability

CMS03(TE12L) is available at Aetrix Electronics and suitable for switching mode power supply applications, portable equipment battery applications, and industrial IoT sensor node power conversion requiring stable component supply and long-term manufacturability.

Supply support for CMS03(TE12L) 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 is a Japanese semiconductor manufacturer specializing in discrete devices, power ICs, and logic products, with decades of leadership in Schottky and MOSFET technologies.

The CMS03(TE12L) belongs to Toshiba's M-FLAT™ Schottky rectifier product line, engineered specifically for ultra-compact, high-efficiency DC/DC power stages in consumer and industrial portable electronics.

FAQ

What is the maximum junction temperature specification for CMS03(TE12L)?

The CMS03(TE12L) has a specified junction temperature range of −40 to 150°C. Toshiba recommends limiting worst-case T_j to below 120°C for high reliability, especially under continuous load. This derating guideline is based on thermal resistance data and lifetime acceleration models documented in the Toshiba Semiconductor Reliability Handbook. The CMS03(TE12L) achieves this with proper PCB thermal design using its M-FLAT™ package.

Does CMS03(TE12L) have a built-in thermal pad, and how should it be connected?

Yes, the CMS03(TE12L) features an exposed cathode thermal pad on its underside, integral to the M-FLAT™ package. This pad must be soldered to a minimum 2 mm × 2 mm copper area on a ceramic board (or 6 mm × 6 mm on glass-epoxy) to achieve the rated R_th(j-a) of 60 °C/W. Improper pad size or insufficient solder coverage will degrade thermal performance and may cause premature failure. The CMS03(TE12L) datasheet provides exact land pattern dimensions for reference.

What is the typical forward voltage of CMS03(TE12L) at 1 A and 3 A?

The CMS03(TE12L) exhibits a typical forward voltage of 0.37 V at 1 A (pulse test) and 0.42 V at 3 A (pulse test), per its Electrical Characteristics table. These values are measured at 25°C with short-duration pulses to avoid self-heating effects. At elevated temperatures or DC conditions, V_FM decreases slightly due to negative temperature coefficient, but design margins must still respect the 0.45 V maximum rating. This behavior is confirmed in the CMS03(TE12L) IF–VF curve.

Is CMS03(TE12L) RoHS compliant and lead-free?

Yes, the CMS03(TE12L) is RoHS compliant and lead-free, conforming to EU Directive 2011/65/EU and subsequent amendments. Toshiba confirms this status in its environmental compliance documentation and product change notifications. The device uses matte tin plating on external terminals and halogen-free molding compound. For full material declarations and exemption details, refer to Toshiba's official environmental reports for the CMS03(TE12L) family.

Can CMS03(TE12L) be used in place of a standard PN-junction rectifier like 1N5822?

Yes, the CMS03(TE12L) can replace 1N5822 in most low-voltage, high-current rectification roles, offering significantly lower forward voltage (0.45 V vs. ~0.55 V), faster switching (no reverse recovery), and smaller footprint (3.0 × 1.4 mm vs. DO-201AD). However, its higher reverse leakage (up to 500 µA vs. <1 µA for 1N5822) requires verification in high-impedance or precision hold circuits. The CMS03(TE12L) is not a drop-in mechanical replacement but a functional upgrade with trade-offs.