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Diodes Incorporated ZLLS400QTC
- Part No.:
- ZLLS400QTC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZLLS400QTC.pdf
- Description:
- DIODE SCHOTTKY 40V 520MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,440
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Product details
Overview
ZLLS400Q from Diodes Incorporated is a 40V, 0.52A surface-mount Schottky barrier diode in SOD323 package, featuring 0.5V max forward voltage at 400mA, 10µA max reverse leakage at 30V, and AEC-Q101 qualification for automotive use in DC-DC converters and charging circuits.
For engineers reviewing the ZLLS400Q datasheet, ZLLS400Q pinout, ZLLS400Q application, or ZLLS400Q equivalent, key selection criteria include thermal performance up to +150°C junction temperature, low VF for high-efficiency power conversion, ultra-low IR for elevated-temperature reliability, and automotive-grade process control with PPAP capability.
Technical Context
This Schottky diode uses a planar metal-semiconductor junction optimized for low forward conduction loss and minimal minority-carrier storage, enabling fast switching (trr ≤ 3ns) and negligible reverse recovery charge (Qrr = 210pC). Its SOD323 package features matte tin–annealed Alloy 42 leads and UL 94V-0 molding compound.
Rated for continuous operation at TJ = +150°C, it delivers stable performance under high ambient conditions (IR = 370µA at +85°C, VR = 30V) and supports pulsed peak currents up to 12A (t ≤ 100µs), making it suitable for transient-heavy power paths in compact automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR | 40 V - Maximum continuous reverse blocking voltage before breakdown |
| IF | 0.52 A - Continuous forward current rating at TA = +25°C |
| VF Max @ 400mA | 0.5 V - Ensures <120mW conduction loss at rated DC load |
| IR Max @ 30V | 10 µA - Enables reliable operation in high-impedance bias networks at +25°C |
| trr | 3 ns - Supports >100MHz switching in synchronous rectifier topologies |
| TJ Max | +150 °C - Allows placement near hot components in engine-control or infotainment modules |
| RθJA | 379 °C/W - Thermal resistance on 25mm × 25mm 1oz FR4; defines derating curve for PCB layout |
Pinout & Package
Package: SOD323 - ultra-compact surface-mount plastic case (1.30 × 1.70 × 0.95 mm), thermally rated to +150°C, with cathode band marking and matte tin–annealed Alloy 42 leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch-node in buck converter) |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to output rail or ground return path |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at high IF | 0.445V typ @ 400mA ensures <180mW steady-state dissipation in 5V/0.5A rails |
| Ultra-low IR at +85°C | 370µA @ VR = 30V enables stable biasing in under-hood telecom modules |
| AEC-Q101 qualified | Validated for automotive applications with PPAP documentation and IATF16949 manufacturing |
| Green construction | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); RoHS 3 compliant |
Applications
| DC-DC Converters | Automotive Charging Circuits |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 12V-to-5V buck converters for ADAS camera modules. IC Role / Device Role / Timing Role: Low-loss freewheeling path during high-frequency (500kHz) PWM cycles. Use Value: Reduces conduction loss by 35% vs. standard silicon diode, lowering thermal stress on 2-layer PCB layouts. | Use Scenario: Reverse-polarity protection and OR-ing in dual-battery USB-C charging systems. IC Role / Device Role / Timing Role: Unidirectional current gate with <0.5V drop to preserve input voltage headroom. Use Value: Maintains >92% efficiency at 400mA while surviving +105°C under-hood ambient per AEC-Q101 stress profile. |
| Mobile Telecom Power Rails | Motor Control Flyback Protection |
Use Scenario: Input rectification in portable baseband processor PMICs with tight thermal budgets. IC Role / Device Role / Timing Role: High-efficiency AC/DC front-end for 3.3V/0.3A auxiliary supplies. Use Value: Enables 0.004g weight savings and 1.3mm × 1.7mm footprint vs. SOD123 alternatives. | Use Scenario: Inductive kick clamping across brushed DC motor windings in HVAC actuators. IC Role / Device Role / Timing Role: Fast-recovery flyback path limiting voltage spikes to <45V during commutation. Use Value: 3ns trr prevents energy loss in snubber networks, reducing EMI in 24V automotive subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZHCS400QTC | Lower VF (0.335V typ @ 100mA), but higher IR (20µA @ 30V) and not AEC-Q101 qualified | Optimized for low-temperature, low-power portable devices; unsuitable for under-hood automotive | Select when thermal budget is <+85°C and automotive qualification is not required |
| SBM4040T3G | Same VR (40V), higher IF (1A), larger SOD-123 package (2.7 × 1.6 mm), RθJA = 220°C/W | Better thermal handling for sustained 0.8A loads; incompatible with space-constrained SOD323 footprints | Select when board area allows larger package and average current exceeds 0.6A |
Compared with ZHCS400QTC and SBM4040T3G, ZLLS400Q uniquely balances automotive qualification, ultra-compact size, and elevated-temperature leakage performance-making it optimal for space- and thermal-constrained AEC-Q101 designs where 0.52A continuous current suffices.
Availability
ZLLS400Q is available at Aetrix Electronics and suitable for automotive power management, mobile telecom DC-DC conversion, and motor control flyback protection requiring stable component supply across production lifecycles.
Supply support for ZLLS400Q 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, specializing in high-reliability power management, signal integrity, and protection solutions.
ZLLS400Q belongs to the ZLLS series of high-temperature Schottky diodes engineered specifically for automotive and industrial applications demanding robust reverse leakage performance above +85°C.
FAQ
What is the maximum junction temperature rating for ZLLS400Q?
The ZLLS400Q has a maximum junction temperature (TJ) rating of +150°C, validated per AEC-Q101 stress testing. This allows operation in under-hood automotive environments and high-density power modules where ambient temperatures exceed +105°C, provided PCB thermal design maintains RθJA ≤ 379°C/W on specified 25mm × 25mm FR4 layout.
Is ZLLS400Q suitable for synchronous rectification in high-frequency DC-DC converters?
Yes - with trr ≤ 3ns and Qrr = 210pC, ZLLS400Q supports synchronous rectification in buck converters operating up to 2MHz. Its low VF (0.445V typ @ 400mA) minimizes conduction loss, while fast recovery avoids cross-conduction losses during dead-time transitions in gate-driver-controlled topologies.
How does ZLLS400Q differ from ZHCS400QTC in thermal performance?
ZLLS400Q specifies IR = 370µA at +85°C and VR = 30V, whereas ZHCS400QTC exhibits higher leakage (≥1µA) under identical conditions. ZLLS400Q's thermal design targets +150°C TJ operation with tighter IR control, making it suitable for sustained high-temperature use where ZHCS400QTC's lower VF advantage diminishes due to leakage-driven inefficiency.
Does ZLLS400Q require special soldering profiles due to its SOD323 package?
No - ZLLS400Q is rated Moisture Sensitivity Level 1 per J-STD-020 and compatible with standard lead-free reflow profiles (peak 260°C). Its SOD323 package uses matte tin–annealed Alloy 42 leads, ensuring reliable wetting and joint integrity without pre-baking or special flux requirements on standard FR4 PCBs.
ZLLS400QTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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):
- 520mA
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 400 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 3 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 30 V
- Capacitance @ Vr, F:
- 15pF @ 30V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- 150°C (Max)
ZLLS400QTC FAQ
1.How can I place an order for ZLLS400QTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLLS400QTC 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 ZLLS400QTC reliable?
The price and inventory of ZLLS400QTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLLS400QTC is usually 5 days.
3.What payment methods are accepted for ZLLS400QTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLLS400QTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLLS400QTC?
ZLLS400QTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLLS400QTC 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 ZLLS400QTC?
For technical support, including ZLLS400QTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLLS400QTC requirements.
6.How does Aetrix verify that ZLLS400QTC is sourced from the original manufacturer or authorized distributors?
All ZLLS400QTC 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 ZLLS400QTC meets industry standards.
7.What is the process for return or replacement of ZLLS400QTC?
All ZLLS400QTC units undergo pre-shipment inspection (PSI). If there is an issue with ZLLS400QTC, 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 ZLLS400QTC part is unused and in its original packaging.
Return procedure for ZLLS400QTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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