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Diodes Incorporated ZHCS350QTA
- Part No.:
- ZHCS350QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
ZHCS350QTA.pdf
- Description:
- DIODE SCHOTT 40V 510MA SOD523 3K
- Quantity:
- Payment:
- Shipping:
Inventory:928
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Product details
Overview
ZHCS350QTA from Diodes Incorporated is a 40V, 350mA surface-mount Schottky barrier diode in SOD523 package, featuring 405mV typical forward voltage at 100mA and 7μA typical reverse leakage at 30V. It serves as a low-loss rectifier in space-constrained DC-DC converters, USB-powered chargers, and LED driver circuits where thermal efficiency and profile height <0.9mm are critical.
For engineers reviewing the ZHCS350QTA datasheet, ZHCS350QTA pinout, ZHCS350QTA application, or ZHCS350QTA equivalent, key selection criteria include its AEC-Q101 qualification, 1.6ns reverse recovery time, junction capacitance of 3.3–6pF at 25V, and compatibility with high-frequency switching topologies up to several MHz.
Technical Context
This Schottky diode employs a platinum-silicide or similar low-barrier metal-semiconductor junction to achieve minimal forward conduction loss and ultrafast switching without minority-carrier storage delay. Its 40V reverse rating targets 24V and 36V input rail applications with margin for transient spikes.
The SOD523 package enables integration into compact power stages where board area and height are constrained-especially in mobile telecom modules and wearable LED drivers. Thermal resistance of 450°C/W (Note 5) reflects performance on minimal copper pad layouts, while 125°C maximum junction temperature supports operation in sealed enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 40 V - Withstands continuous 40V reverse bias; suitable for 24V system inputs with 66% derating margin. |
| IF (Continuous Forward Current) | 350 mA - Maximum steady-state current without thermal runaway on standard FR-4 PCB. |
| VF @ 100mA | 405 mV typ. - Enables <120mW conduction loss per diode in 100mA load paths. |
| tRR (Reverse Recovery Time) | 1.6 ns - Eliminates switching tail current in >1MHz buck/boost converters. |
| CD @ 25V | 3.3–6 pF - Minimizes capacitive loading on gate-drive or feedback nodes in high-speed circuits. |
| IR @ 30V | 7 μA typ. - Limits standby power loss in always-on charger detection or battery backup paths. |
| RθJA (Note 5) | 450 °C/W - Requires ≤230mW dissipation on 1×1 inch 2oz copper pad to stay within 125°C TJ limit. |
Pinout & Package
Package: SOD523 - ultra-low-profile surface-mount package (0.9mm height, 0.80mm pad width), cathode indicated by band on top surface. Molded green compound, matte tin-plated leads, IATF 16949 certified manufacturing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in synchronous buck); must route with minimal inductance. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; ties to output rail or higher potential; determines polarity in reverse-biased protection configurations. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics requiring PPAP documentation and change control. |
| SOD523 footprint | 0.9mm max height enables stacking under connectors or beneath thin-film batteries in portable designs. |
| 100% matte tin plating | Ensures reliable solder wetting and intermetallic formation with lead-free SAC305 and SnCu alloys. |
| Halogen & antimony free | Meets JEDEC JS709E "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb) for eco-compliant end equipment. |
| HBM ESD rating | 4000V tolerance allows direct handling in non-ESD-controlled assembly environments without added protection. |
Applications
| DC-DC Converters | USB-C Charger Circuits |
|---|---|
Use Scenario: Synchronous rectification in 1–3MHz buck converters powering PMICs or SoCs in tablets. IC Role / Device Role: Low-VF freewheeling diode replacing MOSFET body diode to reduce conduction loss and improve light-load efficiency. Use Value: 405mV VF at 100mA cuts diode conduction loss by ~45% vs. standard silicon diodes, extending battery runtime. |
Use Scenario: Output rectification in 20–65W GaN-based USB-C PD chargers with multi-phase topology. IC Role / Device Role: Secondary-side clamp and snubber diode absorbing leakage inductance energy during primary switch turn-off. Use Value: 1.6ns tRR prevents voltage overshoot beyond 40V rating when clamping fast-rising transients from GaN FETs. |
| LED Driver Circuits | MOSFET Voltage Protection |
Use Scenario: Reverse-polarity protection and boost converter flyback diode in automotive interior LED lighting modules. IC Role / Device Role: Input protection diode and inductive energy recirculation path in constant-current boost drivers. Use Value: 7μA IR at 30V ensures <2.1μW standby loss per diode-critical for always-on cabin lighting with 10-year shelf life. |
Use Scenario: Clamp diode across motor driver half-bridge outputs to suppress inductive kickback in BLDC fan controllers. IC Role / Device Role: Fast-recovery path limiting drain-source voltage excursion during MOSFET turn-off. Use Value: 40V VR rating with 60V breakdown margin accommodates 36V nominal bus + 20% surge without avalanche stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB520S-30T2R | 30V VR, 200mA IF, VF = 370mV @ 100mA, SOD-523 package | Limited to ≤30V systems; lower current rating reduces margin in 24V industrial converters | Select when VR margin is relaxed and board layout prioritizes identical footprint over voltage headroom. |
| NSR0330P2T5G | 30V VR, 300mA IF, VF = 410mV @ 100mA, SOD-523 package, AEC-Q101 qualified | Same qualification level but 10V lower VR; slightly higher VF increases conduction loss by ~1.2mW at 100mA | Prefer for cost-sensitive automotive modules where 30V rail compliance is sufficient and supply chain favors ON Semi. |
Compared with RB520S-30T2R and NSR0330P2T5G, ZHCS350QTA provides the highest VR rating (40V) and lowest VF (405mV typ.) in SOD523 among AEC-Q101-qualified Schottkys-making it optimal for 24V+ systems demanding both robustness and efficiency.
Availability
ZHCS350QTA is available at Aetrix Electronics and suitable for DC-DC converters, USB-C charger circuits, and LED driver circuits requiring stable component supply, automotive-grade reliability, and low-profile packaging.
Supply support for ZHCS350QTA 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in IATF 16949-certified facilities.
ZHCS350QTA belongs to Diodes' AEC-Q101-qualified Schottky diode portfolio, engineered specifically for high-efficiency, space-constrained power conversion in automotive and portable electronics.
FAQ
Is ZHCS350QTA suitable for automotive applications?
Yes. ZHCS350QTA is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. It meets automotive requirements for temperature cycling, humidity testing, and mechanical shock-validated for use in body control modules, LED lighting, and infotainment power supplies.
What is the maximum allowable ambient temperature for continuous operation?
At 350mA DC forward current, ambient temperature must not exceed 85°C when mounted on a 1×1 inch 2oz copper pad (per Note 5). Derating curves in Figure 4 show usable current drops to ~250mA at 100°C TA and ~150mA at 125°C TA.
Does ZHCS350QTA have a specified junction-to-case thermal resistance?
No. The datasheet specifies only junction-to-ambient thermal resistance (RθJA = 450°C/W for Note 5 layout). Junction-to-case (RθJC) is not published, as the SOD523 package lacks a defined thermal pad or case surface for measurement per JESD51 standards.
Can ZHCS350QTA replace a standard silicon diode in a 12V buck converter?
Yes-provided the peak reverse voltage remains below 40V and average current stays ≤350mA. Its 405mV VF at 100mA reduces conduction loss by ~65% versus a 1N4148 (VF ≈ 1.2V), improving efficiency and reducing thermal stress on adjacent components.
ZHCS350QTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 510mA
- Voltage - Forward (Vf) (Max) @ If:
- 810 mV @ 350 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 1.6 ns
- Current - Reverse Leakage @ Vr:
- 12 µA @ 30 V
- Capacitance @ Vr, F:
- 6pF @ 25V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- 125°C
ZHCS350QTA FAQ
1.How can I place an order for ZHCS350QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHCS350QTA 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 ZHCS350QTA reliable?
The price and inventory of ZHCS350QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHCS350QTA is usually 5 days.
3.What payment methods are accepted for ZHCS350QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHCS350QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHCS350QTA?
ZHCS350QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHCS350QTA 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 ZHCS350QTA?
For technical support, including ZHCS350QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHCS350QTA requirements.
6.How does Aetrix verify that ZHCS350QTA is sourced from the original manufacturer or authorized distributors?
All ZHCS350QTA 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 ZHCS350QTA meets industry standards.
7.What is the process for return or replacement of ZHCS350QTA?
All ZHCS350QTA units undergo pre-shipment inspection (PSI). If there is an issue with ZHCS350QTA, 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 ZHCS350QTA part is unused and in its original packaging.
Return procedure for ZHCS350QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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