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Diodes Incorporated ZLLS500TA
- Part No.:
- ZLLS500TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZLLS500TA.pdf
- Description:
- DIODE SCHOTTKY 40V 700MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:22,836
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Product details
Overview
ZLLS500TA from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT23 package, rated for 40V reverse voltage and 0.7A continuous forward current, with 10μA reverse leakage at 30V and 25°C. It delivers low forward voltage (305–710 mV across 50–1500 mA), fast 3 ns reverse recovery time, and operates up to 150°C junction temperature-ideal for high-efficiency DC-DC converters in automotive and industrial power supplies.
For engineers reviewing the ZLLS500TA datasheet, ZLLS500TA pinout, ZLLS500TA application, or ZLLS500TA equivalent, key selection criteria include its AEC-Q101 qualification, thermal rating to 150°C, low VF at elevated temperatures (415 mV @ 500 mA, 100°C), and SOT23 footprint compatibility with space-constrained mobile telecomms and motor control designs.
Technical Context
This Schottky diode uses a planar metal-semiconductor junction optimized for low conduction loss and minimal switching charge. Its 210 pC reverse recovery charge and 3 ns trr enable high-frequency operation in synchronous rectification and flyback topologies without significant switching loss penalties.
The device's thermal resistance (RθJA = 198 °C/W on FR4 with short-duration pulse) and 150°C maximum junction temperature support sustained operation in thermally demanding environments such as under-hood automotive modules and sealed industrial enclosures where ambient exceeds 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR | 40 V - Maximum reverse blocking voltage before breakdown; defines safe operating range in boost/flyback output stages. |
| IF | 0.7 A - Continuous forward current rating; determines steady-state power delivery capability in charging circuits. |
| VF @ 500 mA | 465–530 mV - Forward voltage drop at typical operating current; directly impacts conduction loss and thermal rise in DC-DC rectifiers. |
| IR @ 30 V | 6–10 μA - Reverse leakage current; critical for standby efficiency and battery drain in always-on mobile telecomms systems. |
| trr | 3 ns - Reverse recovery time; enables stable operation above 1 MHz switching frequencies without oscillation or shoot-through risk. |
| TJ max | 150 °C - Maximum junction temperature; supports use in AEC-Q101-compliant automotive applications without derating at 100°C ambient. |
| Qrr | 210 pC - Reverse recovery charge; quantifies stored charge cleared during turn-off; lower value reduces EMI and gate drive stress in synchronous FETs. |
Pinout & Package
Package: SOT23 - Surface-mount plastic package with matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1, UL 94V-0 rated, and 0.0089 g weight. Thermally rated to 150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Forward current entry point; connects to switch node in buck converter or cathode of driving FET in flyback. |
| 2 (Cathode) | Cathode connection | Forward current exit point; ties to output rail or ground return path; carries full load current during conduction. |
| 3 (NC) | No connect | Internally unconnected terminal; must remain floating-no PCB trace or thermal pad connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in engine control and ADAS power rails. |
| Low VF at 100°C | 415 mV @ 500 mA, 100°C-maintains high efficiency in thermally stressed environments where silicon diodes degrade significantly. |
| Fast trr = 3 ns | Enables clean turn-off in >1 MHz SMPS designs without snubbers or added gate resistance on synchronous MOSFETs. |
| SOT23 footprint | Standardized 3-pin package compatible with automated pick-and-place and reflow profiles; supports high-density board layouts in mobile chargers. |
Applications
| DC-DC Converters | Mobile Charging Circuits |
|---|---|
Use Scenario: Secondary-side rectification in 5–24 V isolated flyback or forward converters powering infotainment systems. IC Role / Device Role: Schottky rectifier replacing slower PN diodes to reduce conduction and switching losses. Use Value: 305–710 mV VF minimizes power loss across 0.1–0.7 A loads, improving overall converter efficiency by ≥2% at 100°C ambient. | Use Scenario: USB-C PD input protection and reverse-polarity blocking in portable power banks. IC Role / Device Role: Low-leakage, low-VF anode-cathode path enabling efficient battery charging while minimizing standby drain. Use Value: 6–10 μA IR at 30 V prevents >10 μA parasitic discharge-critical for multi-day battery retention in always-connected devices. |
| Automotive Strobe Lighting | Brushed DC Motor Control |
Use Scenario: Freewheeling path for high-current LED driver ICs in emergency vehicle light bars. IC Role / Device Role: Fast-recovery freewheeling diode clamping inductive kickback from pulsed 12 V loads. Use Value: 3 ns trr and 13 A non-repetitive surge rating suppress voltage spikes ≤40 V, protecting driver ICs without external TVS. | Use Scenario: Flyback suppression in 12/24 V brushed motor drivers for HVAC actuators and seat controls. IC Role / Device Role: Energy recirculation path during PWM off-time to maintain torque and reduce EMI. Use Value: 210 pC Qrr limits di/dt-induced ringing; combined with 150°C TJ rating, ensures reliability over 10,000+ motor cycles at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VBSS8140VH | 40 V VR, 1 A IF, VF = 450 mV @ 1 A, SOT23-3, AEC-Q101 qualified | Higher current rating but larger VF at low currents; requires layout review for thermal dissipation at 1 A continuous | Preferred when peak load exceeds 0.7 A but board area remains constrained |
| ZHCS500TA | 40 V VR, 0.7 A IF, VF = 270 mV @ 100 mA, not AEC-Q101 qualified, lower thermal rating (125°C TJ) | Optimized for <85°C ambient; unsuitable for under-hood or sealed industrial enclosures | Select only for cost-sensitive consumer electronics with ambient ≤70°C and no automotive qualification requirement |
Compared with VBSS8140VH and ZHCS500TA, ZLLS500TA uniquely balances AEC-Q101 compliance, 150°C operation, and sub-500 mV VF at 500 mA-making it the optimal choice for thermally aggressive, safety-critical automotive and industrial rectification where reliability and efficiency must coexist.
Availability
ZLLS500TA is available at Aetrix Electronics and suitable for DC-DC converters, mobile charging circuits, automotive strobe lighting, and brushed DC motor control requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant sourcing.
Supply support for ZLLS500TA 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 for automotive, industrial, and consumer markets.
The ZLLS series targets high-temperature, high-efficiency Schottky rectification-designed specifically for automotive power supplies, industrial DC-DC modules, and telecomms infrastructure where thermal robustness and low VF consistency across temperature are mandatory.
FAQ
Is ZLLS500TA suitable for automotive under-hood applications?
Yes. ZLLS500TA is AEC-Q101 qualified and rated for 150°C junction temperature, with verified performance up to 100°C ambient in DC-DC converters and motor drivers. Its 10 μA reverse leakage at 30 V and 85°C ensures low standby loss in engine control units and body electronics modules.
What is the significance of the NC pin (Pin 3) in the SOT23 package?
Pin 3 is internally unconnected and must remain electrically floating-no solder joint, trace, or thermal pad should be attached. Connecting it risks internal shorting or thermal stress due to mechanical mismatch between the leadframe and die attach. The NC designation is confirmed in Diodes' DS33227 Rev. 6-2 schematic and top-view diagram.
How does ZLLS500TA's VF compare to standard silicon diodes at 100°C?
At 500 mA and 100°C, ZLLS500TA exhibits VF = 415 mV, whereas a typical 1N4007 silicon diode exceeds 900 mV under identical conditions. This 54% reduction lowers conduction loss by >50%, directly improving thermal margin and efficiency in high-ambient applications like sealed power adapters.
Can ZLLS500TA replace ZHCS500TA in existing designs?
ZLLS500TA can substitute ZHCS500TA electrically and mechanically (same SOT23-3 footprint), but only if the application requires AEC-Q101 qualification or operates above 85°C ambient. ZHCS500TA offers lower VF at room temperature but lacks high-temperature leakage stability and automotive qualification-so replacement requires thermal validation and compliance review.
ZLLS500TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 700mA
- Voltage - Forward (Vf) (Max) @ If:
- 530 mV @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 3 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 30 V
- Capacitance @ Vr, F:
- 16pF @ 30V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
- Operating Temperature - Junction:
- 150°C (Max)
ZLLS500TA FAQ
1.How can I place an order for ZLLS500TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLLS500TA 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 ZLLS500TA reliable?
The price and inventory of ZLLS500TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLLS500TA is usually 5 days.
3.What payment methods are accepted for ZLLS500TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLLS500TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLLS500TA?
ZLLS500TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLLS500TA 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 ZLLS500TA?
For technical support, including ZLLS500TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLLS500TA requirements.
6.How does Aetrix verify that ZLLS500TA is sourced from the original manufacturer or authorized distributors?
All ZLLS500TA 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 ZLLS500TA meets industry standards.
7.What is the process for return or replacement of ZLLS500TA?
All ZLLS500TA units undergo pre-shipment inspection (PSI). If there is an issue with ZLLS500TA, 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 ZLLS500TA part is unused and in its original packaging.
Return procedure for ZLLS500TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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