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Diodes Incorporated ZHCS500QTA
- Part No.:
- ZHCS500QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZHCS500QTA.pdf
- Description:
- DIODE SCHOTTKY 40V 1A SOT23-3 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
ZHCS500QTA from Diodes Incorporated is a surface-mount Schottky barrier diode rated for 40 V reverse voltage, 500 mA continuous forward current, and 550 mV maximum forward voltage at 500 mA. It features low leakage (40 µA max at 30 V), fast 10 ns reverse recovery time, and AEC-Q101 qualification for automotive reliability. Used in DC–DC converters and mobile telecom power stages.
For engineers reviewing the ZHCS500QTA datasheet, ZHCS500QTA pinout, ZHCS500QTA application, or ZHCS500QTA equivalent, key selection criteria include VF vs. IF trade-off, thermal derating above +100°C, IR stability under high VR bias, and SOT23 footprint compatibility with automated placement.
Technical Context
This Schottky diode employs a planar epitaxial construction optimized for low forward conduction loss and minimal switching charge. Its 10 ns tRR and 20 pF capacitance at 25 V support high-frequency operation in synchronous rectification and buck converter freewheeling paths.
The device operates within a -55°C to +150°C storage range and 125°C maximum junction temperature. Thermal resistance (RθJA) is not explicitly specified, but its 330 mW power dissipation at +25°C implies ~76°C/W typical for SOT23 on standard FR-4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 40 V - Maximum DC or repetitive peak reverse bias before breakdown; defines safe operating limit in flyback or clamp circuits. |
| IF (Continuous Forward Current) | 500 mA - Sustained DC current capability at TA = +25°C; derates to ~350 mA at +100°C per thermal limits. |
| VF @ 500 mA | 550 mV - Forward drop determining conduction loss; yields ~275 mW dissipation at full load. |
| IR @ 30 V | 40 µA - Reverse leakage defining standby power loss in high-impedance bias networks or hold-up circuits. |
| tRR | 10 ns - Reverse recovery time enabling >1 MHz switching in SMPS without excessive ringing or shoot-through risk. |
| CD @ 25 V | 20 pF - Junction capacitance affecting high-frequency impedance and EMI generation in RF-coupled paths. |
| TJ (Max) | 125 °C - Absolute junction temperature ceiling; requires PCB copper area and airflow management for sustained 500 mA operation. |
Pinout & Package
Package: SOT23 - Surface-mount plastic package with 3 terminals, JEDEC TO-236AB compliant, moisture sensitivity level 1, 0.008 g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward current entry point; connects to switch node or input rail in buck/flyback topologies. |
| 2 | No Connect | Internally unconnected lead; electrically isolated, no routing required. |
| 3 | Cathode | Forward current exit and reverse blocking terminal; ties to ground or output capacitor negative in rectifier applications. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test conditions. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU; no intentionally added lead, bromine & chlorine <900 ppm each, antimony <1000 ppm. |
| SOT23 footprint | Standardized 3-pin outline (2.4 mm × 1.3 mm × 1.0 mm) compatible with industry-standard pick-and-place and reflow profiles. |
| Low VF across IF range | 300 mV at 100 mA and 460 mV at 250 mA enable high-efficiency light-load operation in battery-powered systems. |
| 10 ns tRR | Enables clean turn-off in high-frequency (>500 kHz) DC–DC converters without snubber networks or gate drive compensation. |
Applications
| DC–DC Converters | Mobile Telecom Power |
|---|---|
Use Scenario: Synchronous rectifier in 3.3 V/5 V buck converter supplying baseband processor core voltage. IC Role / Device Role: Freewheeling diode replacing MOSFET body diode to reduce conduction loss and improve efficiency at light loads. Use Value: 550 mV VF at 500 mA lowers average power loss by ~180 mW versus standard silicon diode, extending battery runtime. | Use Scenario: Reverse polarity protection and supply rail clamping in LTE modem power management IC interface. IC Role / Device Role: Low-leakage blocking diode preventing backfeed during hot-swap events and transient overvoltage suppression. Use Value: 40 µA IR at 30 V ensures <1.2 µW standby loss in always-on 3.8 V rail, critical for ultra-low-power sleep modes. |
| PCMCIA Card Power | Automotive Body Control Module |
Use Scenario: Hot-swap protection diode in PCMCIA Type II card slot, isolating host 3.3 V bus from peripheral card during insertion/removal. IC Role / Device Role: Isolation element limiting inrush current and blocking reverse current during card initialization. Use Value: 10 ns tRR prevents latch-up during rapid bus transients; SOT23 size fits tight 2.5 mm board height constraints. | Use Scenario: Load dump protection and reverse battery connection safeguard in 12 V lighting control circuit. IC Role / Device Role: Clamp diode shunting surge energy into bulk capacitor while maintaining 40 V VR rating margin over nominal 13.5 V system. Use Value: AEC-Q101 qualification ensures survival under 1000-cycle temperature cycling (-40°C to +125°C) and 1000-hour HTRB stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR0540T1G (ON Semiconductor) | Same 40 V VR, 500 mA IF, but VF = 520 mV @ 500 mA; SOD-123 package (larger footprint, higher RθJA). | Less suitable for space-constrained mobile PCBs; better thermal margin in open-frame industrial designs. | Choose when board layout allows larger package and lower VF is prioritized over size. |
| SS34 (Good-Ark) | 40 V VR, 3 A IF rating, VF = 500 mV @ 3 A; DO-214AC package (5.3 mm × 2.7 mm), higher IR (500 µA @ 30 V). | Over-specified current capacity for 500 mA use; higher leakage limits use in ultra-low-power standby circuits. | Choose only if existing design uses DO-214AC and thermal headroom exceeds requirement. |
Compared with MBR0540T1G and SS34, ZHCS500QTA offers optimal balance of SOT23 miniaturization, AEC-Q101 compliance, and 40 µA low-leakage performance-making it preferred for automotive infotainment and compact telecom modules where footprint and reliability are co-constrained.
Availability
ZHCS500QTA is available at Aetrix Electronics and suitable for DC–DC converters, mobile telecom power rails, and PCMCIA card interfaces requiring stable component supply across automotive, industrial, and consumer production programs.
Supply support for ZHCS500QTA 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 China, Taiwan, and the US.
ZHCS500QTA belongs to Diodes' AEC-Q101-qualified Schottky diode product line, engineered specifically for high-reliability power conversion in automotive and portable electronics where low VF, small footprint, and robust thermal performance are essential.
FAQ
What is the maximum allowable junction temperature for ZHCS500QTA during continuous operation?
The absolute maximum junction temperature (TJ) is 125°C. Operation above this value risks permanent degradation of the Schottky junction. Derating curves show usable IF drops to ~350 mA at +100°C ambient, assuming standard 1-inch² copper pad on FR-4. Thermal simulation or thermocouple validation is recommended for high-power density layouts.
Is ZHCS500QTA suitable for reverse battery protection in 12 V automotive systems?
Yes, with design margin. Its 40 V VR rating provides 3× headroom above nominal 12 V (13.5 V max), covering ISO 7637-2 pulse 1 (−100 V) when used with external TVS clamping. However, it must be paired with a series fuse or current limiter, as its IFSM (6.75 A @ 100 µs) is insufficient for direct load-dump handling without additional protection.
Does the NC pin (Pin 2) require PCB routing or grounding?
No. Pin 2 is internally unconnected and electrically isolated. It must remain un-routed and un-soldered on the PCB. Routing traces to or from Pin 2 introduces parasitic coupling and violates JEDEC SOT23 mechanical specifications. Standard SOT23 land patterns treat Pin 2 as a non-functional thermal pad or dummy lead.
How does ZHCS500QTA's VF change at elevated temperatures?
VF decreases with rising junction temperature: at IF = 500 mA, VF is ~440 mV at +100°C (per datasheet note). This negative tempco improves conduction efficiency under thermal stress but requires verification against system-level thermal runaway thresholds in parallel diode configurations or high-ambient environments.
ZHCS500QTA 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):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 10 ns
- Current - Reverse Leakage @ Vr:
- 40 µA @ 30 V
- Capacitance @ Vr, F:
- 20pF @ 25V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
- Operating Temperature - Junction:
- 125°C
ZHCS500QTA FAQ
1.How can I place an order for ZHCS500QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHCS500QTA 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 ZHCS500QTA reliable?
The price and inventory of ZHCS500QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHCS500QTA is usually 5 days.
3.What payment methods are accepted for ZHCS500QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHCS500QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHCS500QTA?
ZHCS500QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHCS500QTA 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 ZHCS500QTA?
For technical support, including ZHCS500QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHCS500QTA requirements.
6.How does Aetrix verify that ZHCS500QTA is sourced from the original manufacturer or authorized distributors?
All ZHCS500QTA 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 ZHCS500QTA meets industry standards.
7.What is the process for return or replacement of ZHCS500QTA?
All ZHCS500QTA units undergo pre-shipment inspection (PSI). If there is an issue with ZHCS500QTA, 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 ZHCS500QTA part is unused and in its original packaging.
Return procedure for ZHCS500QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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