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Diodes Incorporated ZLLS400QTA
- Part No.:
- ZLLS400QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZLLS400QTA.pdf
- Description:
- DIODE SCHOTTKY 40V 520MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,711
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Product details
Overview
ZLLS400QTA 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 ZLLS400QTA datasheet, ZLLS400QTA pinout, ZLLS400QTA application, or ZLLS400QTA equivalent, key selection criteria include thermal performance up to +150°C junction temperature, low VF operation at elevated temperatures (+100°C), and compliance with automotive PPAP and IATF16949 manufacturing requirements.
Technical Context
This Schottky diode employs a planar epitaxial construction optimized for low forward voltage and minimal reverse recovery charge (Qrr = 210pC), enabling high-efficiency switching in high-frequency DC-DC topologies. Its 3.79°C/W junction-to-ambient thermal resistance (RθJA) is measured on 25mm × 25mm FR4 with 1oz copper, supporting stable operation under sustained 0.52A forward current.
The device delivers 0.305–0.5V forward voltage across 50–750mA test currents and maintains 6–10µA reverse leakage at VR = 30V, with verified performance up to +85°C ambient and +150°C junction temperature-critical for under-hood automotive power management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 40 V - Maximum continuous blocking voltage without breakdown |
| IF (Forward Current) | 0.52 A - Continuous DC current rating at +25°C ambient |
| VF Max @ 400mA | 0.5 V - Ensures <1.2W conduction loss in 2.4W load paths |
| IR Max @ 30V | 10 µA - Enables low-power standby modes in battery-sensitive systems |
| trr (Reverse Recovery) | 3 ns - Minimizes switching losses in >1MHz buck converters |
| TJ Max | +150°C - Supports placement near hot components in engine control units |
| Qrr | 210 pC - Reduces turn-off energy loss in synchronous rectification |
Pinout & Package
Package: SOD323 - Surface-mount plastic case, 1.30mm × 1.70mm footprint, 0.30mm nominal height, thermally rated to +150°C, UL 94V-0 compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential node (e.g., switch node in buck sync rectifier) |
| Cathode | Current exit point; marked by band on package | Connected to output rail or ground return path; defines polarity in layout |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at high temperature | 0.405V @ 400mA, TA = +100°C - Maintains efficiency in under-dash electronics |
| Extremely low IR | 10µA @ 30V, TA = +25°C - Limits standby power drain in always-on modules |
| AEC-Q101 qualified | Validated for automotive stress tests including HTGB, HTRB, TCT - enables direct use in ASIL-B subsystems |
| Thermal robustness | RθJA = 317°C/W (short-term) - Allows higher transient current handling in motor drive flyback paths |
| Green construction | Halogen- and antimony-free, RoHS 3 compliant - Meets EU ELV and OEM sustainability mandates |
Applications
| Automotive DC-DC Converters | USB-C Charging Circuits |
|---|---|
Use Scenario: 12V-to-5V/3.3V buck converter in body control module with ambient up to +85°C. IC Role / Device Role / Timing Role: Synchronous rectifier diode replacing MOSFET gate drive complexity. Use Value: 0.5V VF reduces conduction loss by ~35% vs. standard silicon diode, lowering thermal load on compact PCB. | Use Scenario: Input protection and reverse polarity blocking in portable USB-C PD sink design. IC Role / Device Role / Timing Role: Low-leakage clamp diode on VBUS line prior to controller IC. Use Value: 10µA IR prevents battery drain during sleep mode; SOD323 footprint fits tight board space. |
| Motor Control Flyback Paths | Industrial Sensor Power Supplies |
Use Scenario: Freewheeling path for 24V brushed DC motor driver with PWM switching at 20kHz. IC Role / Device Role / Timing Role: Fast-recovery flyback diode absorbing inductive kickback. Use Value: 3ns trr and 210pC Qrr minimize voltage overshoot and EMI generation during turn-off. | Use Scenario: Auxiliary 3.3V supply for MEMS pressure sensor in factory automation node. IC Role / Device Role / Timing Role: Output rectifier in isolated flyback auxiliary winding. Use Value: +150°C TJ rating ensures reliability in sealed enclosures with no active cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZHCS400QTA | Lower VF (0.32V @ 400mA) but rated only to +125°C TJ; not AEC-Q101 qualified | Better efficiency below +85°C; unsuitable for under-hood automotive use | Select for consumer-grade portable devices where cost and ultra-low VF outweigh thermal/AEC needs |
| SBM140T1G | Same 40V/0.52A rating but TO-236AB (SOT-23) package; RθJA = 250°C/W; no AEC-Q101 | Larger footprint; better thermal dissipation but incompatible with SOD323 land pattern | Choose when board layout allows SOT-23 and higher peak power handling is required |
Compared with ZHCS400QTA and SBM140T1G, ZLLS400QTA uniquely combines AEC-Q101 qualification, +150°C junction rating, and SOD323 miniaturization-making it the only option for space-constrained, high-temperature automotive power rails requiring zero-change-control sourcing.
Availability
ZLLS400QTA is available at Aetrix Electronics and suitable for automotive power conversion, USB-C charging circuits, and industrial motor control systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for ZLLS400QTA 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, manufacturing, and sales operations across Asia, Europe, and North America.
ZLLS400QTA belongs to the ZLLS series of high-temperature Schottky diodes engineered specifically for automotive and industrial power conversion where thermal resilience and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum allowable junction temperature for ZLLS400QTA?
The absolute maximum junction temperature is +150°C, validated per AEC-Q101 stress testing. Operation at this limit requires derating IF to ≤0.35A at +100°C ambient, based on RθJA = 317°C/W (short-term) and thermal design margin. Exceeding TJ(max) risks permanent parametric shift or bond wire failure.
Is ZLLS400QTA compatible with lead-free reflow profiles?
Yes-ZLLS400QTA uses matte tin annealed terminals over Alloy 42 leadframe and is qualified for standard IPC/JEDEC J-STD-020 Level 1 moisture sensitivity. It withstands peak reflow temperatures up to +260°C for 30 seconds, matching industry-standard lead-free soldering processes without delamination or voiding.
Does ZLLS400QTA have a specified reverse recovery time (trr)?
Yes-trr is specified as 3ns (typical) when switched from IF = 500mA to VR = 5.5V, measured at IR = 50mA with di/dt = 500mA/ns, Rsource = 6Ω, and Rload = 10Ω. This value is confirmed in DS38245 Rev. 3-2, page 3, and supports efficient operation in >1MHz switching converters.
How does ZLLS400QTA differ from ZLLS400QTC?
ZLLS400QTA and ZLLS400QTC share identical electrical and thermal specifications and SOD323 packaging. The sole difference is packaging quantity: ZLLS400QTA ships in 3,000-unit tape-and-reel reels, while ZLLS400QTC ships in 10,000-unit reels-enabling optimized procurement for prototype vs. high-volume production runs.
ZLLS400QTA 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)
ZLLS400QTA FAQ
1.How can I place an order for ZLLS400QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLLS400QTA 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 ZLLS400QTA reliable?
The price and inventory of ZLLS400QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLLS400QTA is usually 5 days.
3.What payment methods are accepted for ZLLS400QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLLS400QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLLS400QTA?
ZLLS400QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLLS400QTA 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 ZLLS400QTA?
For technical support, including ZLLS400QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLLS400QTA requirements.
6.How does Aetrix verify that ZLLS400QTA is sourced from the original manufacturer or authorized distributors?
All ZLLS400QTA 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 ZLLS400QTA meets industry standards.
7.What is the process for return or replacement of ZLLS400QTA?
All ZLLS400QTA units undergo pre-shipment inspection (PSI). If there is an issue with ZLLS400QTA, 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 ZLLS400QTA part is unused and in its original packaging.
Return procedure for ZLLS400QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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