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Toshiba Semiconductor and Storage CUHS15F40,H3F
- Part No.:
- CUHS15F40,H3F
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Single Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
CUHS15F40,H3F.pdf
- Description:
- DIODE SCHOTTKY 40V 1.5A US2H
- Quantity:
- Payment:
- Shipping:
Inventory:11,330
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Product details
Overview
CUHS15F40 from Toshiba Electronic Devices & Storage Corporation is a silicon epitaxial Schottky barrier diode optimized for high-speed switching applications, with 40 V reverse voltage rating, 1.5 A average rectified current, 10 A non-repetitive peak forward surge current, and low forward voltage drop (0.45 V max at 500 mA). It serves as a freewheeling or output rectifier in compact DC-DC converters.
For engineers reviewing the CUHS15F40 datasheet, CUHS15F40 pinout, CUHS15F40 application, or CUHS15F40 equivalent, key selection considerations include its US2H surface-mount package, thermal resistance of 105 °C/W (FR4 board), reverse leakage behavior under high VR/Tj, and trade-offs between VF/Ct/IR performance at 25 °C.
Technical Context
The CUHS15F40 employs a planar Schottky junction structure on silicon epitaxial substrate to achieve fast recovery (no minority-carrier storage) and low conduction loss. Its electrical behavior is characterized by strong temperature dependence of reverse current and VF drift, requiring derating above 85 °C ambient.
Thermal design must account for junction-to-ambient resistance of 105 °C/W under standard FR4 mounting (25.4 × 25.4 × 1.6 mm, 645 mm² Cu pad), and pulse testing conditions (10 ms for IFSM, pulsed VF/IR measurements) define its transient capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - Maximum blocking voltage before breakdown; sets upper limit for input/output rail selection in buck or flyback topologies. |
| Average Rectified Current (IO) | 1.5 A - Continuous DC current handling at Ta = 25 °C on standard FR4; derates to ~0.9 A at 100 °C ambient. |
| Forward Voltage (VF) | 0.45 V max at IF = 500 mA - Low conduction loss enables high-efficiency operation in portable power supplies. |
| Reverse Current (IR) | 50 µA max at VR = 40 V - Higher than PN diodes; requires thermal-aware layout to avoid runaway at elevated Tj. |
| Total Capacitance (Ct) | 130 pF max at VR = 0 V, f = 1 MHz - Limits high-frequency switching noise and affects snubber design in SMPS. |
| Junction-to-Ambient Rth | 105 °C/W - Defines thermal rise per watt; mandates minimum copper area and airflow for sustained 1.5 A operation. |
Pinout & Package
CUHS15F40 is housed in the US2H surface-mount package (5.4 mg typical weight), a 2-pin ultra-small molded plastic case with gull-wing leads. The package footprint conforms to JEDEC MO-203-AB and supports reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to higher-potential node in forward bias; carries full load current during conduction; requires thermal pad connection for heat dissipation. |
| 2 | Anode | Connected to lower-potential node; referenced to ground or switch node; polarity-sensitive placement critical for rectification direction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low forward voltage | 0.45 V max at 500 mA reduces conduction loss by >30% vs. comparable 40 V PN diodes, improving efficiency in battery-powered systems. |
| Fast switching with no recovery tail | Zero reverse recovery charge (Qrr ≈ 0) eliminates switching loss spikes and EMI in high-frequency (>500 kHz) DC-DC converters. |
| Compact US2H package | 0.8 mm profile and 2.5 × 1.3 mm footprint enable dense PCB layouts in space-constrained IoT and wearables. |
| Controlled thermal resistance | 105 °C/W (FR4) allows predictable junction temperature estimation without heatsinks in low-power (<1 W) applications. |
Applications
| USB Power Delivery Adapter | Industrial Sensor Node PSU |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 20–30 W GaN-based USB PD adapters operating at 200–500 kHz. IC Role / Device Role / Timing Role: Output rectifier replacing MOSFET gate drivers; conducts during transformer secondary voltage positive half-cycle. Use Value: 0.45 V VF minimizes conduction loss at 1.5 A load, enabling >94% efficiency without complex control circuitry. | Use Scenario: Input protection and reverse-polarity safeguard in 3.3 V/5 V sensor nodes powered by coin cells or energy harvesters. IC Role / Device Role / Timing Role: Polarity guard diode placed before LDO input; blocks reverse current during battery swap or misinsertion. Use Value: 1.5 A IO rating and 40 V VR provide margin against transient surges while maintaining <0.5 V dropout at 200 mA. |
| Automotive Cabin LED Driver | Wireless Charging Transmitter |
Use Scenario: Freewheeling path in 12 V automotive LED driver ICs driving 5–10 W cabin lighting loads. IC Role / Device Role / Timing Role: Clamp diode across inductive load; conducts during MOSFET off-time to sustain current flow. Use Value: 10 A IFSM withstands inrush during cold-crank (up to 14 V, 100 ms pulses), preventing latch-up or failure. | Use Scenario: Synchronous rectification in 15 W Qi-compliant wireless charging transmitter pads operating at 110–205 kHz. IC Role / Device Role / Timing Role: Secondary-side rectifier converting AC from receiver coil to regulated DC for battery charging. Use Value: 130 pF Ct limits displacement current and EMI generation, supporting EMC compliance without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB055LAM-40TR | Same 40 V VR, 1.5 A IO, but TO-220FP package (larger, higher Rth(j-a) = 70 °C/W); VF = 0.52 V typ at 1 A. | Requires heatsink for >0.8 A continuous use; unsuitable for ultra-thin designs. | Select RB055LAM-40TR only when higher surge robustness and through-hole assembly are prioritized over size and thermal density. |
| SS14-E3/5AT | 40 V VR, 1 A IO (lower), SMA package; VF = 0.5 V max at 1 A; IR = 500 µA max at 40 V (higher leakage). | Limited to ≤1 A loads; higher IR increases thermal risk in sealed enclosures above 85 °C. | Choose SS14-E3/5AT only for cost-sensitive, low-current (<0.8 A), non-thermally constrained applications where US2H footprint is not required. |
Compared with RB055LAM-40TR and SS14-E3/5AT, the CUHS15F40 delivers superior power density (US2H footprint), lowest VF among 40 V/1.5 A Schottkys, and balanced IR/Ct for high-frequency SMPS-making it optimal for space- and efficiency-critical portable and industrial power stages.
Availability
CUHS15F40 is available at Aetrix Electronics and suitable for USB PD adapters, industrial sensor node PSUs, and automotive cabin LED drivers requiring stable component supply, RoHS-compliant sourcing, and consistent parametric performance across production lots.
Supply support for CUHS15F40 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 reliability, efficiency, and miniaturization for industrial, consumer, and automotive markets.
The CUHS15F40 belongs to Toshiba's high-speed Schottky diode product line, engineered specifically for compact, high-efficiency DC-DC conversion in portable and IoT edge devices where low VF, small footprint, and controlled thermal behavior are critical.
FAQ
What is the maximum junction temperature for the CUHS15F40?
The CUHS15F40 has a maximum junction temperature (Tj) rating of 150 °C. Operation beyond this limit risks irreversible degradation of the Schottky junction. Derating is required above 85 °C ambient; for example, at 100 °C ambient, the allowable power dissipation drops significantly due to the 105 °C/W thermal resistance. Always verify Tj using measured case temperature and actual power loss in the CUHS15F40.
Does the CUHS15F40 have a specified reverse recovery time (trr)?
No-the CUHS15F40 is a Schottky barrier diode and exhibits no minority-carrier storage, so reverse recovery time (trr) is effectively zero. This eliminates reverse recovery losses and associated EMI, making the CUHS15F40 ideal for high-frequency switching applications such as 500 kHz+ DC-DC converters where trr-related losses dominate in PN diodes.
What is the marking code for the CUHS15F40?
The CUHS15F40 is marked with the code "7E" on the device body. This two-character laser marking identifies the part unambiguously on the US2H package and corresponds to the full part number CUHS15F40 per Toshiba's standard marking scheme. No additional date or lot codes are included in the primary marking.
Can the CUHS15F40 be used in automotive under-hood applications?
The CUHS15F40 is not qualified for automotive under-hood applications (AEC-Q101) and is rated for storage temperature of −55 to +150 °C but not guaranteed for extended high-temperature operation in engine compartments. Its design targets industrial and consumer power supplies-not safety-critical or high-reliability automotive environments. For such use, consider AEC-Q101-qualified alternatives instead of the CUHS15F40.
What is the recommended land pattern for the CUHS15F40 US2H package?
Toshiba specifies a reference land pattern for the CUHS15F40 US2H package in its datasheet (Fig. 8.1), with dimensions optimized for reflow soldering on FR4. Key features include 0.5 mm pad width, 1.0 mm pad length, and 0.8 mm pitch. Use of the recommended pattern ensures mechanical reliability and thermal performance matching the 105 °C/W Rth(j-a) specification. Deviations may impair solder joint integrity or thermal dissipation in the CUHS15F40.
CUHS15F40,H3F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- 2-SMD, Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 1.5A
- Voltage - Forward (Vf) (Max) @ If:
- 630 mV @ 1.5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 50 µA @ 40 V
- Capacitance @ Vr, F:
- 130pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- US2H
- Operating Temperature - Junction:
- 150°C (Max)
CUHS15F40,H3F FAQ
1.How can I place an order for CUHS15F40,H3F through Aetrix?
Please submit a Request for Quotation (RFQ) for CUHS15F40,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 CUHS15F40,H3F reliable?
The price and inventory of CUHS15F40,H3F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CUHS15F40,H3F is usually 5 days.
3.What payment methods are accepted for CUHS15F40,H3F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CUHS15F40,H3F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CUHS15F40,H3F?
CUHS15F40,H3F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CUHS15F40,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 CUHS15F40,H3F?
For technical support, including CUHS15F40,H3F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CUHS15F40,H3F requirements.
6.How does Aetrix verify that CUHS15F40,H3F is sourced from the original manufacturer or authorized distributors?
All CUHS15F40,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 CUHS15F40,H3F meets industry standards.
7.What is the process for return or replacement of CUHS15F40,H3F?
All CUHS15F40,H3F units undergo pre-shipment inspection (PSI). If there is an issue with CUHS15F40,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 CUHS15F40,H3F part is unused and in its original packaging.
Return procedure for CUHS15F40,H3F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CUHS15F40,H3F Tags
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