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Diodes Incorporated ZLLS400TA
- Part No.:
- ZLLS400TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZLLS400TA.pdf
- Description:
- DIODE SCHOTTKY 40V 520MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:18,424
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Product details
Overview
ZLLS400TA 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 thermally rated to +150°C - deployed in DC-DC converters for high-efficiency power conversion under elevated ambient temperatures.
For engineers reviewing the ZLLS400TA datasheet, ZLLS400TA pinout, ZLLS400TA application, or ZLLS400TA equivalent, key selection criteria include low VF at high IF, ultra-low IR at 30V, thermal robustness up to +150°C junction temperature, and SOD323 footprint compatibility with space-constrained mobile and automotive charging circuits.
Technical Context
This Schottky diode uses a planar metal-semiconductor junction optimized for fast switching (tRR ≤ 3ns) and minimal conduction loss. Its low forward voltage drop (305–360mV typ. at 50mA) and tight VF distribution across current range (up to 710–800mV at 1.5A) support stable efficiency in pulse-loaded DC-DC topologies.
Reverse recovery charge QRR is specified at 210pC, confirming minimal switching loss during turn-off. Diode capacitance CD = 15pF at 1MHz/30V enables predictable high-frequency behavior in synchronous rectifier and flyback snubber applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 40 V - Maximum continuous blocking voltage without breakdown; defines safe operating range in buck/flyback output stages. |
| IF (Forward Current) | 0.52 A - Continuous DC current rating; supports compact power delivery in portable chargers and PMIC output rails. |
| VF @ 400mA | 0.5 V max - Low conduction loss ensures >92% efficiency in 5V-output converters at full load. |
| IR @ 30V | 10 µA max - Ultra-low leakage preserves battery runtime in always-on charging control paths. |
| tRR | 3 ns - Fast recovery minimizes switching loss and EMI in MHz-range switching regulators. |
| TJ Max | +150°C - Enables reliable operation on hot PCB zones near power MOSFETs or in sealed enclosures. |
| CD @ 1MHz | 15 pF - Predictable capacitive loading for gate-drive snubbing and resonant circuit tuning. |
Pinout & Package
Package: SOD323 - ultra-compact 1.3 × 1.7 mm surface-mount outline with 0.3 mm lead pitch, thermally rated to +150°C, RoHS-compliant matte tin finish over Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry point | Connected to switch node or input rail; low-resistance path enables high-current forward conduction with minimal heating. |
| Cathode (K) | Current exit point | Connected to ground or output capacitor; reverse-biased during off-state to block 40V with <10µA leakage. |
Key Features
| Feature | Design Value |
|---|---|
| Low Equivalent On-Resistance | Derived from VF/IF: ~0.96Ω max at 400mA - reduces I²R loss in high-duty-cycle power paths. |
| Extremely Low Leakage | 10µA max @ 30V, 25°C; rises to 370µA @ 85°C - maintains standby integrity in battery-backed systems. |
| High-Current Capability | 0.52A continuous, 12A non-repetitive peak - withstands inrush and transient surges in motor drive freewheeling paths. |
| Fast Switching | tRR ≤ 3ns, QRR = 210pC - limits switching loss and ringing in MHz-class synchronous rectifiers. |
Applications
| DC-DC Converters | Mobile Telecoms |
|---|---|
Use Scenario: Secondary-side rectification in 2–5W buck converters powering baseband processors. IC Role / Device Role: Synchronous rectifier replacement or freewheeling diode in non-synchronous designs. Use Value: 0.5V VF reduces conduction loss by 35% vs. standard silicon diodes, improving light-load efficiency above 85%. | Use Scenario: USB-C PD input protection and reverse-polarity blocking in smartphone charging ICs. IC Role / Device Role: Input polarity guard and backfeed prevention diode. Use Value: 10µA IR at 30V prevents standby current drain, extending battery life in always-connected devices. |
| Charging Circuits | Motor Controls |
Use Scenario: Output OR-ing diode in dual-input (USB + adapter) battery charger modules. IC Role / Device Role: Power-path selector enabling seamless source handover without voltage droop. Use Value: Low VF ensures <50mV dropout at 400mA, minimizing thermal rise and maintaining precise charge voltage regulation. | Use Scenario: Freewheeling path for brushed DC motor drivers in automotive seat/mirror actuators. IC Role / Device Role: Inductive kickback clamp during H-bridge PWM commutation. Use Value: 3ns tRR and 12A IFSM suppress voltage spikes >60V, protecting gate drivers from destructive transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VSKY0540 | Same VR (40V), lower IF (0.4A), higher VF (0.55V @ 400mA) | Marginally lower power handling; less suitable for sustained 0.5A loads | Prefer ZLLS400TA where continuous 0.52A and thermal margin to +150°C are required. |
| ON Semiconductor NSR0540HT1G | Same VR (40V), identical IF (0.5A), slightly higher IR (20µA @ 30V) | Higher leakage may impact battery retention in long-idle IoT nodes | Choose ZLLS400TA when sub-10µA leakage at 30V is critical for low-power standby. |
Compared with VSKY0540 and NSR0540HT1G, ZLLS400TA delivers superior thermal capability (+150°C TJ), tighter leakage control (10µA vs. 20µA), and higher continuous current (0.52A), making it optimal for thermally dense, battery-sensitive, and high-reliability power paths.
Availability
ZLLS400TA is available at Aetrix Electronics and suitable for DC-DC converters, mobile telecoms charging circuits, and motor controls requiring stable component supply with guaranteed long-term sourcing and full RoHS/Green compliance.
Supply support for ZLLS400TA 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-performance, energy-efficient components for power management, signal integrity, and protection.
ZLLS400TA belongs to the ZLLS series of high-temperature Schottky diodes engineered specifically for efficient operation above +85°C in space-constrained power conversion and battery-powered systems.
FAQ
What is the maximum junction temperature rating for ZLLS400TA?
ZLLS400TA has a maximum junction temperature (TJ) rating of +150°C, verified per thermal characterization on 1-inch² copper pad (RθJA = 330°C/W). This allows reliable operation in thermally demanding locations such as near power MOSFETs or in sealed automotive modules without derating below 0.52A continuous current.
Is ZLLS400TA suitable for automotive applications?
Yes - an AEC-Q101 qualified variant, ZLLS400Q, is available under a separate datasheet. While ZLLS400TA itself is not automotive-qualified, its thermal robustness (+150°C TJ), low leakage, and SOD323 reliability make it widely used in non-safety-critical automotive subsystems like infotainment power supplies and body control module charging interfaces.
How does ZLLS400TA compare to ZHCS400 in thermal performance?
ZLLS400TA is optimized for high-temperature operation (>+85°C), with thermal resistance reduced by 31% on copper pad (RθJA = 330°C/W) versus ZHCS400 (RθJA = 480°C/W). Its VF also increases less with temperature - 405mV @ 400mA/+100°C vs. significantly higher drift in ZHCS400 - making it preferred for hot-environment DC-DC stages.
What is the reverse recovery time and why is it important for ZLLS400TA?
ZLLS400TA has a reverse recovery time (tRR) of ≤3ns, measured under standardized conditions (IF = 500mA → VR = 5.5V, di/dt = 500mA/ns). This ultra-fast recovery minimizes switching loss and voltage overshoot in high-frequency converters (≥1MHz), directly improving efficiency and reducing EMI filter requirements in compact power supplies.
ZLLS400TA 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- 150°C (Max)
ZLLS400TA FAQ
1.How can I place an order for ZLLS400TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLLS400TA 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 ZLLS400TA reliable?
The price and inventory of ZLLS400TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLLS400TA is usually 5 days.
3.What payment methods are accepted for ZLLS400TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLLS400TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLLS400TA?
ZLLS400TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLLS400TA 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 ZLLS400TA?
For technical support, including ZLLS400TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLLS400TA requirements.
6.How does Aetrix verify that ZLLS400TA is sourced from the original manufacturer or authorized distributors?
All ZLLS400TA 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 ZLLS400TA meets industry standards.
7.What is the process for return or replacement of ZLLS400TA?
All ZLLS400TA units undergo pre-shipment inspection (PSI). If there is an issue with ZLLS400TA, 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 ZLLS400TA part is unused and in its original packaging.
Return procedure for ZLLS400TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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