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Diodes Incorporated ZHCS500QTC
- Part No.:
- ZHCS500QTC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZHCS500QTC.pdf
- Description:
- DIODE SCHOTTKY 40V 1A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,870
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Product details
Overview
ZHCS500QTC from Diodes Incorporated is a surface-mount Schottky barrier diode rated for 40 V reverse voltage, 500 mA continuous forward current, and 550 mV forward voltage at 500 mA, used in DC–DC converters and mobile telecom power rails where low-loss rectification is critical.
For engineers reviewing the ZHCS500QTC datasheet, ZHCS500QTC pinout, ZHCS500QTC application, or ZHCS500QTC equivalent, key selection criteria include its AEC-Q101 qualification, SOT23 package thermal performance (TJ = 125°C), low 10 ns reverse recovery time, and 40 µA max reverse leakage at 30 V.
Technical Context
This Schottky diode operates with majority-carrier conduction to eliminate minority-carrier storage delay, enabling fast switching (tRR = 10 ns) and high-frequency operation in buck converter freewheeling paths. Its low 550 mV VF at 500 mA reduces conduction loss versus PN-junction diodes.
The device uses an alloy-42 leadframe with matte tin plating and green molding compound (UL 94V-0), supporting lead-free reflow assembly. It is qualified per AEC-Q101 Rev D for automotive underhood applications requiring TSTG = –55°C to +150°C and moisture sensitivity level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - Maximum blocking voltage before breakdown; sets upper limit for input/output rail separation in 12 V/24 V DC–DC stages |
| Forward Current (IF) | 500 mA continuous - Sustained load current capability without derating at TA = 25°C; supports compact 1 A peak-rated converter designs |
| Forward Voltage (VF) | 550 mV @ 500 mA - Directly determines I²R conduction loss; enables >92% efficiency in 3.3 V output buck converters |
| Reverse Recovery Time (tRR) | 10 ns - Enables operation up to ~5 MHz switching frequency without significant switching loss penalty |
| Reverse Leakage (IR) | 40 µA @ 30 V - Low leakage preserves light-load efficiency and prevents unintended discharge in standby modes |
| Junction Temperature (TJ) | 125°C - Defines maximum allowable die temperature; requires ≤ 100°C board temperature with 2.2°C/W θJA (SOT23) |
| Thermal Resistance (θJA) | 377°C/W - Measured on standard JEDEC 2S2P test board; actual value drops to ~120°C/W with 25 mm² copper pour |
Pinout & Package
Package: SOT23 - Surface-mount plastic case (2.4 × 1.3 × 0.9 mm), UL 94V-0 rated, moisture sensitivity level 1, 0.008 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward current entry point | Connected to switch node in synchronous buck; must minimize trace inductance to reduce voltage spikes during turn-off |
| 2 (NC) | No connection | Internally unconnected; no PCB routing required; may be left floating or tied to ground for mechanical stability |
| 3 (Cathode) | Forward current exit / reverse voltage reference | Connected to output capacitor and controller feedback network; serves as return path for freewheeling current |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use (–40°C to +125°C ambient) with PPAP documentation support |
| Low 550 mV VF at 500 mA | Reduces forward power loss by ≥40% vs. comparable 40 V PN diodes, directly improving light-load efficiency |
| 10 ns reverse recovery | Enables clean zero-voltage switching transitions in 1–3 MHz DC–DC topologies without snubbers |
| Halogen- and antimony-free "Green" construction | Meets IEC 61249-2-21:2011 with Br+Cl <1500 ppm and Sb <1000 ppm; supports EU EcoDesign compliance |
| SOT23 footprint compatibility | Direct drop-in replacement for ZLLS400, BAT54, and other 3-pin SOT23 Schottkys without layout change |
Applications
| DC–DC Converters | Mobile Telecom Power Rails |
|---|---|
Use Scenario: Secondary-side rectification in 3.3 V/5 V buck converters powering baseband processors and RF transceivers. IC Role / Device Role: Freewheeling diode providing low-loss current path during high-side FET off-time. Use Value: 550 mV VF minimizes conduction loss at 500 mA load, sustaining >90% efficiency at 100 mA–1 A output range. | Use Scenario: Reverse polarity protection and battery backup path isolation in LTE/5G small cell front-end modules. IC Role / Device Role: Unidirectional current gate preventing backfeed from auxiliary Li-ion cells into main PMIC rails. Use Value: 40 µA max IR at 30 V ensures <1 µW standby leakage, preserving battery life over multi-week idle periods. |
| PCMCIA Card Power Switching | Automotive Body Control Modules |
Use Scenario: Hot-swap power sequencing and 3.3 V/5 V rail isolation in legacy PCMCIA/CardBus peripheral interfaces. IC Role / Device Role: OR-ing diode enabling dual-supply redundancy while blocking cross-conduction between host and card supplies. Use Value: 10 ns tRR prevents latch-up during rapid supply switchover; 500 mA rating supports full-card active load. | Use Scenario: Load dump clamping and reverse-battery protection in 12 V lighting control circuits (headlamps, interior LEDs). IC Role / Device Role: Clamp diode shunting transient energy during ISO 7637-2 pulse 5a events; also blocks reverse current if battery installed backward. Use Value: AEC-Q101 qualification ensures reliability across –40°C to +125°C ambient; 6.75 A IFSM withstands 100 µs surge pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAT54C | 30 V VR, 200 mA IF, 370 mV VF @ 100 mA - lower voltage/current rating, higher VF at 500 mA | Not suitable for 40 V input rails or sustained 500 mA loads; limited to low-power signal or bias applications | Select only if operating below 24 V and <200 mA; verify thermal margin with θJA = 400°C/W |
| ZLLS400 | 40 V VR, 500 mA IF, 520 mV VF @ 500 mA - slightly lower VF, same package, no AEC-Q101 qualification | Lacks automotive qualification and PPAP support; identical electrical behavior in non-automotive designs | Prefer for industrial or consumer DC–DC where AEC-Q101 is not mandated; identical SOT23 footprint and solder profile |
Compared with BAT54C and ZLLS400, ZHCS500QTC uniquely combines AEC-Q101 qualification, 40 V/500 mA rating, and 550 mV VF in SOT23-making it the only option qualified for automotive body electronics with full 12 V system margin and thermal headroom.
Availability
ZHCS500QTC is available at Aetrix Electronics and suitable for DC–DC converters, mobile telecom power rails, and automotive body control modules requiring stable component supply and long-term lifecycle assurance.
Supply support for ZHCS500QTC 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 and manufacturing operations across Asia and the US.
ZHCS500 belongs to Diodes' high-reliability Schottky diode product line, engineered specifically for automotive power conversion and portable electronics where low VF, fast switching, and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum junction temperature for ZHCS500QTC?
The absolute maximum junction temperature is 125°C, as specified in the Electrical Characteristics table. This limit applies under steady-state conditions with proper PCB thermal relief. Derating is required above 25°C ambient; at 85°C board temperature, maximum continuous IF drops to ~320 mA based on θJA = 377°C/W and PD = 330 mW.
Is ZHCS500QTC pin-compatible with BAT54 series diodes?
Yes-ZHCS500QTC uses the standard SOT23 package with identical pinout: Pin 1 = Anode, Pin 2 = NC, Pin 3 = Cathode. It replaces BAT54C, BAT54A, and BAT54S in layout without modification, though its 40 V rating exceeds BAT54's 30 V limit, enabling safer operation in 24 V systems.
Does ZHCS500QTC support lead-free reflow soldering?
Yes-its matte tin finish over alloy-42 leadframe is qualified per J-STD-020 Class 3 moisture sensitivity level 1 and fully compatible with Pb-free reflow profiles (peak 260°C, 10 sec max). The green molding compound meets UL 94V-0 flammability requirements and contains no halogens or antimony.
How does ZHCS500QTC perform in reverse-battery protection circuits?
In reverse-battery protection, ZHCS500QTC blocks up to 40 V reverse polarity with only 40 µA leakage at 30 V, minimizing standby drain. Its 6.75 A non-repetitive surge rating (100 µs) handles ISO 7637-2 pulse 5a load-dump transients when placed in series with the input rail, provided external TVS clamping is added for >40 V spikes.
ZHCS500QTC 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:
- 780 mV @ 1 A
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
- Operating Temperature - Junction:
- 125°C (Max)
ZHCS500QTC FAQ
1.How can I place an order for ZHCS500QTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHCS500QTC 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 ZHCS500QTC reliable?
The price and inventory of ZHCS500QTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHCS500QTC is usually 5 days.
3.What payment methods are accepted for ZHCS500QTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHCS500QTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHCS500QTC?
ZHCS500QTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHCS500QTC 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 ZHCS500QTC?
For technical support, including ZHCS500QTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHCS500QTC requirements.
6.How does Aetrix verify that ZHCS500QTC is sourced from the original manufacturer or authorized distributors?
All ZHCS500QTC 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 ZHCS500QTC meets industry standards.
7.What is the process for return or replacement of ZHCS500QTC?
All ZHCS500QTC units undergo pre-shipment inspection (PSI). If there is an issue with ZHCS500QTC, 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 ZHCS500QTC part is unused and in its original packaging.
Return procedure for ZHCS500QTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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