Toshiba Semiconductor and Storage CRS30I40A(TE85L,QM

Overview

CRS30I40A from Toshiba is a Schottky barrier diode optimized for secondary rectification and reverse-current protection in compact DC-DC converters and mobile power systems. It delivers V_RRM = 40 V, I_F(AV) = 3 A, V_FM ≤ 0.55 V at 3 A, R_th(j-a) = 70 °C/W (ceramic board), and uses the ultra-thin 3-2A1S (S-FLAT) package.

For engineers reviewing the CRS30I40A datasheet, CRS30I40A pinout, CRS30I40A application, or CRS30I40A equivalent, key selection criteria include low forward voltage for efficiency-critical 5–12 V output rails, thermal performance on high-density PCBs, and reliability under repetitive surge conditions up to 25 A.

Technical Context

This Schottky diode employs a planar silicon structure with metal-semiconductor junction design to minimize conduction loss and switching recovery time. Its low V_FM (0.49 V typ. at 3 A) and low C_j (62 pF at 10 V) support high-frequency operation in synchronous and non-synchronous buck converters.

The device operates with T_j up to 150 °C and requires derating per Toshiba's thermal guidelines: maximum recommended I_F(AV) is 80% of rating (2.4 A) when T_j is held below 120 °C. Reverse leakage (I_RRM ≤ 100 µA at 40 V) is managed via layout-aware thermal design due to inherent Schottky sensitivity to temperature-induced runaway.

Key Specifications

Pinout & Package

CRS30I40A uses the 3-2A1S (S-FLAT) surface-mount package: ultra-thin (0.9 mm max height), leadless, two-terminal construction with exposed cathode pad for thermal enhancement. Weight: 0.013 g (typ.).

Key Features

Applications

Equivalent & Alternatives

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

Compared with RB055LAM-40 and SS34-HF, the CRS30I40A provides superior power density and thermal performance in space-limited applications due to its 0.9 mm S-FLAT package and 70 °C/W R_th(j-a), while maintaining identical voltage/current ratings and competitive forward voltage.

Availability

CRS30I40A is available at Aetrix Electronics and suitable for secondary rectification in switching regulators, reverse-current protection in mobile devices, and DC-DC conversion in wearables requiring stable component supply and long-term lifecycle support.

Supply support for CRS30I40A 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 CRS30I40A belongs to Toshiba's S-FLAT Schottky diode product line, engineered specifically for high-density, thermally constrained DC-DC power stages in portable and battery-powered electronics.

FAQ

What is the maximum junction temperature rating for the CRS30I40A?

The absolute maximum junction temperature (T_j) for the CRS30I40A is 150 °C. However, Toshiba recommends limiting operating T_j to ≤120 °C for high reliability, especially under continuous 3 A load. Derating curves in the datasheet (Fig. 10.3) define allowable I_F(AV) versus ambient temperature to maintain this limit. The CRS30I40A achieves this with proper PCB thermal design using its S-FLAT package.

Does the CRS30I40A have a specified thermal resistance from junction to lead (R_th(j-ℓ))?

Yes, the CRS30I40A specifies R_th(j-ℓ) = 20 °C/W (max) from junction to cathode lead. This value reflects direct conduction through the exposed cathode pad to the PCB copper, making it critical for thermal modeling. It is measured with the device mounted on a glass-epoxy board (50 mm × 50 mm, 6 mm × 6 mm land, 1.6 mm thickness). The CRS30I40A's low R_th(j-ℓ) supports efficient heat transfer in compact layouts.

What is the marking code printed on the CRS30I40A package?

Each CRS30I40A unit is marked with the code "SV" on the top surface of the S-FLAT package. This marking identifies the device as the CRS30I40A part number per Toshiba's standard labeling scheme. The "SV" code is visible under magnification and aligns with the land pattern dimensions shown in Figure 9.1 of the official CRS30I40A datasheet.

Can the CRS30I40A be used in automotive infotainment power supplies?

The CRS30I40A is not qualified to AEC-Q101 and is not recommended for automotive applications unless fully validated by the end customer per their internal reliability requirements. Its absolute maximum ratings and thermal behavior are specified for commercial/industrial use. For automotive-grade alternatives, consult Toshiba's AEC-Q101-certified Schottky diodes. The CRS30I40A remains suitable for consumer and industrial portable power systems.

What is the typical junction capacitance (C_j) of the CRS30I40A and at what condition is it measured?

The typical junction capacitance (C_j) of the CRS30I40A is 62 pF, measured at V_R = 10 V and f = 1 MHz. This parameter directly impacts high-frequency switching losses and EMI generation in DC-DC converters. The CRS30I40A's C_j is confirmed in Section 6 of the datasheet and supports stable operation in converters switching up to 2 MHz without excessive capacitive turn-on loss.