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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Toshiba Semiconductor and Storage CMS10I40A(TE12L,QM

Name: CMS10I40A(TE12L,QM
Brand: Toshiba Semiconductor and Storage
SKU: CMS10I40A(TE12L,QM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CMS10I40A(TE12L,QM

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Single Diodes

Package:: SOD-128

Datasheet:: CMS10I40A(TE12L,QM.pdf

Description:: DIODE SCHOTTKY 40V 1A M-FLAT

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Product details

Overview

CMS10I40A from Toshiba is a Schottky barrier diode optimized for secondary rectification and reverse-current protection in compact DC-DC converters and mobile power circuits. It delivers V_FM ≤ 0.45 V at 1 A, supports 40 V repetitive peak reverse voltage (V_RRM), handles 1 A average forward current (I_F(AV)), and uses the ultra-thin M-FLAT (3-4E1S) surface-mount package for high-density PCB layouts.

For engineers reviewing the CMS10I40A datasheet, CMS10I40A pinout, CMS10I40A application, or CMS10I40A equivalent, key selection criteria include low forward voltage drop under 1 A load, thermal resistance limits in constrained board environments, junction temperature derating guidance up to 120 °C, and compatibility with ceramic or FR-4 thermal mounting configurations.

Technical Context

The CMS10I40A employs a planar Schottky junction structure optimized for fast switching and minimal conduction loss in low-voltage, high-frequency power conversion. Its low V_FM (0.37 V typ. @ 1 A) and low C_j (62 pF @ 10 V) reduce both forward conduction loss and reverse recovery-related switching losses.

Designed for operation within a -55 °C to +150 °C storage range and rated for 150 °C maximum junction temperature, the device requires thermal design consideration due to its relatively high R_th(j-a) (60 °C/W on ceramic, 135 °C/W on FR-4), especially under sustained I_F(AV) loads near 1 A.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum reverse blocking capability without breakdown; suitable for 3.3 V–24 V output rails with margin.
I_F(AV)	1 A - Continuous DC forward current rating; requires thermal management above ~0.8 A in typical FR-4 layouts.
V_FM (max)	0.45 V @ I_FM = 1 A - Low conduction loss enables >95% efficiency in 5 V/1 A buck converter secondaries.
I_RRM (max)	100 µA @ V_RRM = 40 V - Higher leakage than PN diodes; necessitates thermal-aware layout in high-temp environments.
R_th(j-a)	60 °C/W (ceramic) / 135 °C/W (FR-4) - Directly impacts allowable power dissipation; dictates minimum copper area and board thickness.
C_j	62 pF @ V_R = 10 V - Low junction capacitance minimizes capacitive switching loss and EMI in MHz-range SMPS.

Pinout & Package

Package: M-FLAT (Toshiba designation 3-4E1S), ultra-thin surface-mount, 2-terminal plastic-molded package (0.023 g typical weight). Dimensions comply with JEDEC MO-229 variant; land pattern reference provided in datasheet Fig. 9.1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	Forward current entry point	Connected to input/switching node side; must be routed with low-inductance trace in high-dI/dt paths.
2 (Cathode)	Forward current exit / reverse-blocking terminal	Connected to output/ground side; serves as thermal path to PCB copper; cathode pad must be sized per Fig. 9.1 for R_th(j-ℓ) = 16 °C/W.

Key Features

Feature	Design Value
Low forward voltage	V_FM ≤ 0.45 V @ 1 A reduces conduction loss by ~30% vs. comparable 40 V PN rectifiers, improving light-load efficiency.
M-FLAT thin-profile package	0.55 mm max height enables stacking under shields or in ultra-slim mobile enclosures where Z-height is constrained.
High surge current tolerance	I_FSM = 25 A (half-sine, 50 Hz) allows robustness against inrush and transient overloads without bond-wire fusing.
Controlled thermal resistance	R_th(j-ℓ) = 16 °C/W (junction-to-cathode lead) enables predictable thermal coupling to large copper pours for passive cooling.

Applications

Secondary Rectification in Switching Regulators	Reverse-Current Protection in Mobile Devices
Use Scenario: Output rectification in 5 V/1 A synchronous buck converter operating at 500 kHz–1 MHz. IC Role / Device Role / Timing Role: Freewheeling diode replacing body diode of low-side MOSFET; conducts during low-side switch off-time. Use Value: 0.45 V V_FM limits conduction loss to <120 mW, enabling >94% full-load efficiency and reducing thermal stress on adjacent ICs.	Use Scenario: USB OTG or battery backup path in smartphones and wearables with dual-input power sources. IC Role / Device Role / Timing Role: Unidirectional isolation element preventing backfeed from main battery into charging IC or accessory port. Use Value: Low V_FM ensures <50 mV dropout at 500 mA, preserving system voltage headroom while blocking >100 µA reverse leakage at 4.2 V battery voltage.
DC-DC Converter Output Stage in IoT Sensors	Load-Switch Isolation in Portable Medical Monitors
Use Scenario: 3.3 V output stage of miniature isolated flyback supplying ultra-low-power sensor nodes. IC Role / Device Role / Timing Role: Secondary-side rectifier handling pulsed 1 A loads with <100 ns turn-off to minimize ringing. Use Value: 62 pF C_j and Schottky zero-recovery behavior suppress voltage overshoot and EMI, easing EMC compliance in Class B emissions-limited designs.	Use Scenario: Isolating Li-ion battery from critical analog front-end during standby or fault conditions. IC Role / Device Role / Timing Role: Passive reverse-polarity and backfeed blocker placed between battery and PMIC input rail. Use Value: 40 V V_RRM provides 2× margin over 3.6 V nominal battery, and 150 °C T_j(max) supports operation inside sealed housings up to 85 °C ambient.

Secondary Rectification in Switching Regulators

Reverse-Current Protection in Mobile Devices

Use Scenario: Output rectification in 5 V/1 A synchronous buck converter operating at 500 kHz–1 MHz.

IC Role / Device Role / Timing Role: Freewheeling diode replacing body diode of low-side MOSFET; conducts during low-side switch off-time.

Use Value: 0.45 V V_FM limits conduction loss to <120 mW, enabling >94% full-load efficiency and reducing thermal stress on adjacent ICs.

Use Scenario: USB OTG or battery backup path in smartphones and wearables with dual-input power sources.

IC Role / Device Role / Timing Role: Unidirectional isolation element preventing backfeed from main battery into charging IC or accessory port.

Use Value: Low V_FM ensures <50 mV dropout at 500 mA, preserving system voltage headroom while blocking >100 µA reverse leakage at 4.2 V battery voltage.

DC-DC Converter Output Stage in IoT Sensors

Load-Switch Isolation in Portable Medical Monitors

Use Scenario: 3.3 V output stage of miniature isolated flyback supplying ultra-low-power sensor nodes.

IC Role / Device Role / Timing Role: Secondary-side rectifier handling pulsed 1 A loads with <100 ns turn-off to minimize ringing.

Use Value: 62 pF C_j and Schottky zero-recovery behavior suppress voltage overshoot and EMI, easing EMC compliance in Class B emissions-limited designs.

Use Scenario: Isolating Li-ion battery from critical analog front-end during standby or fault conditions.

IC Role / Device Role / Timing Role: Passive reverse-polarity and backfeed blocker placed between battery and PMIC input rail.

Use Value: 40 V V_RRM provides 2× margin over 3.6 V nominal battery, and 150 °C T_j(max) supports operation inside sealed housings up to 85 °C ambient.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
RB050M-40TF	Higher V_FM (0.55 V max @ 1 A); same V_RRM, slightly larger SOD-123FL package (1.0 mm height).	Less suitable for space-constrained mobile designs; acceptable where 0.1 V higher drop is tolerable.	Choose RB050M-40TF only if M-FLAT footprint compatibility is not required and thermal budget permits higher conduction loss.
SS14-HF	Lower I_F(AV) (0.5 A); identical V_RRM and V_FM spec, but higher R_th(j-a) (180 °C/W on FR-4).	Not recommended for continuous 1 A loads; limited to intermittent or lower-current protection roles.	Select SS14-HF only for sub-500 mA reverse-protection applications where cost is prioritized over thermal performance.

Compared with RB050M-40TF and SS14-HF, the CMS10I40A uniquely balances 1 A current capacity, 0.45 V V_FM, and 0.55 mm profile-making it the only option among the three qualified for thermally dense 1 A secondary rectification in <1 mm Z-height mobile power stages.

Availability

CMS10I40A is available at Aetrix Electronics and suitable for secondary rectification in switching regulators, reverse-current protection in mobile devices, and DC-DC converter output stages requiring stable component supply and consistent M-FLAT packaging.

Supply support for CMS10I40A 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 reliability for consumer, industrial, and automotive systems.

The CMS10I40A belongs to Toshiba's M-FLAT Schottky diode product line, engineered specifically for high-efficiency, space-constrained DC-DC power conversion in portable and battery-powered electronics.

FAQ

What is the maximum junction temperature rating for the CMS10I40A?

The CMS10I40A has a maximum junction temperature (T_j) rating of 150 °C. However, Toshiba recommends limiting steady-state operation to ≤120 °C to ensure long-term reliability, especially under sustained I_F(AV) loads. Derating curves in Figure 10.3 of the CMS10I40A datasheet define safe I_F(AV) limits versus ambient temperature.

Does the CMS10I40A have a specified thermal resistance from junction to lead (R_th(j-ℓ))?

Yes, the CMS10I40A specifies R_th(j-ℓ) = 16 °C/W (maximum), measured from junction to cathode lead. This value enables accurate thermal modeling when the cathode pad is connected to an internal or external copper plane, and is critical for estimating temperature rise under 1 A DC load.

Can the CMS10I40A be used in place of a standard PN rectifier in a 24 V input buck converter?

The CMS10I40A is rated for V_RRM = 40 V, making it unsuitable for direct replacement in 24 V input buck converters where reverse voltage transients may exceed 40 V. It is intended for output-side rectification (e.g., 3.3 V, 5 V, or 12 V rails) or low-voltage reverse-protection-not high-V_IN primary-side applications.

What is the marking code printed on the CMS10I40A package?

The CMS10I40A is marked with "ST" on the top surface of the M-FLAT package, per Figure 7.1 in the official Toshiba datasheet. This two-character code identifies the device as CMS10I40A and is used for traceability and visual inspection during assembly and QA.

Is the CMS10I40A RoHS compliant and halogen-free?

Yes, the CMS10I40A meets RoHS Directive 2011/65/EU requirements and is halogen-free per Toshiba's environmental specifications. Compliance documentation, including material declarations and test reports, is available through Toshiba's official website or authorized distributors upon request.

CMS10I40A(TE12L,QM Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: -

Package/Case:: SOD-128

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 450 mV @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 100 µA @ 40 V

Capacitance @ Vr, F:: 62pF @ 10V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: M-FLAT (2.4x3.8)

Operating Temperature - Junction:: 150°C (Max)

CMS10I40A(TE12L,QM FAQ

1.How can I place an order for CMS10I40A(TE12L,QM through Aetrix?

Please submit a Request for Quotation (RFQ) for CMS10I40A(TE12L,QM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CMS10I40A(TE12L,QM reliable?

The price and inventory of CMS10I40A(TE12L,QM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CMS10I40A(TE12L,QM is usually 5 days.

3.What payment methods are accepted for CMS10I40A(TE12L,QM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CMS10I40A(TE12L,QM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CMS10I40A(TE12L,QM?

CMS10I40A(TE12L,QM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CMS10I40A(TE12L,QM order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CMS10I40A(TE12L,QM?

For technical support, including CMS10I40A(TE12L,QM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CMS10I40A(TE12L,QM requirements.

6.How does Aetrix verify that CMS10I40A(TE12L,QM is sourced from the original manufacturer or authorized distributors?

All CMS10I40A(TE12L,QM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CMS10I40A(TE12L,QM meets industry standards.

7.What is the process for return or replacement of CMS10I40A(TE12L,QM?

All CMS10I40A(TE12L,QM units undergo pre-shipment inspection (PSI). If there is an issue with CMS10I40A(TE12L,QM, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CMS10I40A(TE12L,QM part is unused and in its original packaging.

Return procedure for CMS10I40A(TE12L,QM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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