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Toshiba Semiconductor and Storage CUS05F40,H3F
- Part No.:
- CUS05F40,H3F
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
CUS05F40,H3F.pdf
- Description:
- DIODE SCHOTTKY 40V 500MA USC
- Quantity:
- Payment:
- Shipping:
Inventory:2,117
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Product details
Overview
CUS05F40,H3F from Toshiba Electronic Devices & Storage Corporation is a silicon epitaxial Schottky barrier diode optimized for high-speed switching in low-voltage DC/DC converters and power management circuits, featuring 40 V reverse voltage rating, 0.5 A average rectified current, and 0.40 V typical forward voltage at 100 mA.
For engineers reviewing the CUS05F40,H3F datasheet, CUS05F40,H3F pinout, CUS05F40,H3F application, or CUS05F40,H3F equivalent, key selection criteria include low forward voltage for efficiency-critical 3.3 V/5 V rail clamping, low reverse leakage (1.8 µA typ. at 40 V), compact USC package suitability for space-constrained layouts, and thermal behavior under continuous forward conduction.
Technical Context
The CUS05F40,H3F implements a planar Schottky junction structure with metal–semiconductor contact optimized for fast recovery (no minority-carrier storage) and minimal reverse recovery charge. Its low VF and low IR trade-off is calibrated for operation up to 150 °C junction temperature.
This diode operates without reverse recovery time (trr ≈ 0 ns), enabling use in high-frequency (>1 MHz) synchronous rectification and flyback snubber circuits where switching losses must be minimized. The 5 A non-repetitive surge rating supports transient load handling in portable power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - Maximum blocking capability for 36 V nominal input rails with safety margin |
| Average Rectified Current (IO) | 0.5 A - Sustained DC output current capacity on FR4 board with 645 mm² copper pad |
| Forward Voltage (VF) | 0.40 V typ. at 100 mA - Reduces conduction loss in low-voltage, high-efficiency buck regulators |
| Reverse Current (IR) | 1.8 µA typ. at VR = 40 V - Enables low standby power in always-on circuitry |
| Total Capacitance (Ct) | 28 pF at VR = 0 V, 1 MHz - Minimizes high-frequency switching noise coupling in SMPS feedback paths |
| Junction Temperature (Tj) | 150 °C max - Supports operation in thermally dense power modules without derating below 125 °C ambient |
Pinout & Package
Package: USC (TOSHIBA 1-1E1S), surface-mount, 2-terminal plastic-molded package weighing 4.5 mg (typ.), footprint compatible with JEDEC TO-236AB outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to higher-potential node in forward bias; ties to output rail or switch node in buck topology |
| 2 | Anode | Connected to lower-potential node (e.g., ground or synchronous FET source); defines current flow direction |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.40 V typ. at 100 mA enables >95% efficiency in 3.3 V output buck converters at light load |
| Controlled reverse leakage | 1.8 µA typ. at 40 V allows stable biasing in precision voltage clamp networks without thermal runaway risk |
| No reverse recovery charge | Zero minority-carrier storage eliminates switching spikes and EMI in >500 kHz DC/DC designs |
| Compact USC footprint | 0.8 × 0.6 × 0.37 mm body size supports ultra-dense layout in wearables and IoT sensor nodes |
Applications
| USB Power Delivery Clamp | IoT Sensor Node Rail Protection |
|---|---|
Use Scenario: Clamping transient overvoltage on USB-C VBUS line during hot-plug events in portable accessories. IC Role / Device Role / Timing Role: Bidirectional voltage clamp protecting downstream PMIC inputs from ±20 V transients. Use Value: 0.40 V VF ensures minimal insertion loss in 5 V power path; 40 V VR covers USB PD 3.0 extended range. | Use Scenario: Reverse-polarity and backfeed protection for coin-cell–powered environmental sensors. IC Role / Device Role / Timing Role: Low-loss series blocking diode preventing battery discharge into inactive subsystems. Use Value: 0.5 A IO sustains peak BLE transmission current; 1.8 µA IR preserves multi-year shelf life. |
| DC/DC Synchronous Rectifier | Industrial PLC Input Protection |
Use Scenario: Secondary-side rectification in isolated 12 V → 3.3 V flyback converter for industrial gateways. IC Role / Device Role / Timing Role: Fast-switching freewheeling diode replacing MOSFET synchronous rectifier in cost-sensitive designs. Use Value: Zero trr eliminates timing dead-time constraints; 28 pF Ct avoids resonance with transformer leakage inductance. | Use Scenario: Input surge suppression for 24 V digital I/O channels exposed to field wiring transients. IC Role / Device Role / Timing Role: Low-capacitance clamp limiting induced spikes to <45 V before TVS activation. Use Value: 40 V VR aligns with 24 V system Class II insulation; 5 A IFSM absorbs 8/20 µs surge pulses per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB050M-40TE25 | Higher VF (0.55 V min at 0.5 A), same 40 V VR, larger SOD-123FL package (1.7 × 1.3 mm) | Less suitable for space-constrained 3.3 V buck outputs due to larger footprint and higher conduction loss | Select when higher surge robustness (10 A IFSM) outweighs size and efficiency requirements |
| SS14-HF | Same USC package, but 40 V VR and 1 A IO rating; VF = 0.5 V typ. at 1 A | Better suited for 1 A output rails; not recommended for sub-0.5 A ultra-low-power nodes where CUS05F40,H3F's 0.40 V VF provides measurable efficiency gain | Choose for higher-current 5 V USB ports where thermal margin exceeds 0.5 A requirement |
Compared with RB050M-40TE25 and SS14-HF, the CUS05F40,H3F delivers the lowest forward voltage in its USC footprint class-critical for extending battery life in sub-100 mA IoT endpoints-while maintaining adequate surge and thermal capability for industrial 24 V I/O protection.
Availability
CUS05F40,H3F is available at Aetrix Electronics and suitable for USB Power Delivery clamp circuits, IoT sensor node rail protection, and industrial PLC input protection requiring stable component supply and long-term manufacturability.
Supply support for CUS05F40,H3F 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 for industrial, automotive, and consumer applications.
The CUS05F40,H3F belongs to Toshiba's USC-packaged Schottky diode product line, engineered specifically for high-efficiency, space-constrained DC/DC conversion and low-leakage voltage clamping in portable and industrial electronics.
FAQ
What is the maximum junction temperature rating for the CUS05F40,H3F?
The CUS05F40,H3F has a maximum junction temperature (Tj) rating of 150 °C. This specification is defined under continuous operation with thermal design based on mounting to an FR4 board (25.4 mm × 25.4 mm × 1.6 mm) with a 645 mm² copper pad. Exceeding this limit may accelerate parametric drift or premature failure, so thermal simulation and layout verification are recommended for CUS05F40,H3F deployments above 125 °C ambient.
Does the CUS05F40,H3F have a specified reverse recovery time (trr)?
No, the CUS05F40,H3F does not specify a reverse recovery time because it is a Schottky barrier diode with majority-carrier conduction. Unlike PN-junction diodes, it exhibits no minority-carrier storage delay; its switching is effectively instantaneous (<1 ns). This characteristic eliminates reverse recovery loss and associated EMI-key advantages confirmed in CUS05F40,H3F application notes for high-frequency DC/DC converters.
What marking code identifies the CUS05F40,H3F on the device body?
The CUS05F40,H3F is marked with the code "7L" on its top surface. This two-character laser marking is consistent across all units and corresponds exclusively to the CUS05F40,H3F part number per Toshiba's packaging documentation. No other Toshiba Schottky diode shares this marking, enabling reliable visual identification during inspection or rework of CUS05F40,H3F in assembled PCBs.
How does the CUS05F40,H3F's reverse leakage compare to standard PN diodes at 40 V?
At VR = 40 V and Ta = 25 °C, the CUS05F40,H3F exhibits 1.8 µA typical reverse current-higher than most PN diodes (typically <100 nA), but intentionally optimized for low VF. This IR level remains stable up to 125 °C and is fully characterized in Toshiba's reliability testing. Designers using CUS05F40,H3F must account for this leakage in ultra-low-power sleep modes, unlike with PN alternatives where leakage is negligible.
Is the CUS05F40,H3F RoHS compliant and lead-free?
Yes, the CUS05F40,H3F is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU requirements. Toshiba confirms compliance via material declarations and third-party testing reports. The device uses matte tin plating on terminals and halogen-free molding compound. For full environmental documentation-including REACH SVHC status and conflict minerals reporting-refer to the official Toshiba Product Environmental Report for CUS05F40,H3F.
CUS05F40,H3F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 810 mV @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 15 µA @ 40 V
- Capacitance @ Vr, F:
- 28pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- USC
- Operating Temperature - Junction:
- 150°C (Max)
CUS05F40,H3F FAQ
1.How can I place an order for CUS05F40,H3F through Aetrix?
Please submit a Request for Quotation (RFQ) for CUS05F40,H3F 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 CUS05F40,H3F reliable?
The price and inventory of CUS05F40,H3F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CUS05F40,H3F is usually 5 days.
3.What payment methods are accepted for CUS05F40,H3F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CUS05F40,H3F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CUS05F40,H3F?
CUS05F40,H3F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CUS05F40,H3F 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 CUS05F40,H3F?
For technical support, including CUS05F40,H3F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CUS05F40,H3F requirements.
6.How does Aetrix verify that CUS05F40,H3F is sourced from the original manufacturer or authorized distributors?
All CUS05F40,H3F 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 CUS05F40,H3F meets industry standards.
7.What is the process for return or replacement of CUS05F40,H3F?
All CUS05F40,H3F units undergo pre-shipment inspection (PSI). If there is an issue with CUS05F40,H3F, 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 CUS05F40,H3F part is unused and in its original packaging.
Return procedure for CUS05F40,H3F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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