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Nexperia USA Inc. RB521S30YL
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- Part No.:
- RB521S30YL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
RB521S30YL.pdf
- Description:
- DIODE SCHOTTKY 30V 200MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,210
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Product details
Overview
RB521S30YL from Nexperia is a planar Schottky barrier rectifier with integrated guard ring for stress protection, rated for 200 mA average forward current and 30 V reverse voltage, featuring low forward voltage (420–500 mV at 200 mA) and ultra-low reverse leakage (≤30 µA at 10 V), deployed in power rail protection and DC-DC converter output stages.
For engineers reviewing the RB521S30YL datasheet, RB521S30YL pinout, RB521S30YL application, or RB521S30YL equivalent, this device is selected for space-constrained, low-loss rectification where thermal performance on FR4 PCBs and cathode-marked SOD523 placement are critical design factors.
Technical Context
This Schottky diode uses a planar junction structure with an integrated guard ring to suppress edge breakdown under high electric field stress, enabling stable operation up to 150 °C junction temperature. Its low VF and low IR stem from optimized metal-semiconductor interface and shallow epitaxial layer design.
Thermal resistance from junction to ambient is 455 K/W on standard FR4 (1 cm² cathode pad), dropping to 250 K/W on ceramic Al₂O₃ substrate - confirming its suitability for thermally demanding, low-profile power paths where solder-point thermal coupling matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 200 mA - maximum continuous forward current at 25 °C ambient with 0.5 duty cycle square wave, defining usable DC/low-frequency rectification capacity |
| VR | 30 V - absolute maximum reverse blocking voltage, limiting use to ≤30 V rails without derating |
| VF @ 200 mA | 420–500 mV - low conduction loss enabling ≥92% efficiency in 3.3 V or 5 V buck converter outputs |
| IR @ 10 V | 2.5–30 µA - minimal leakage ensures <1 µW standby loss in reverse-biased polarity protection circuits |
| Cd @ 1 V | 20–25 pF - low junction capacitance supports >100 MHz switching stability in RF bias or fast transient clamping |
| Rth(j-a) | 455 K/W (FR4, std footprint) - thermal impedance constrains max power dissipation to ~110 mW at 75 °C ambient rise |
Pinout & Package
Encapsulated in SOD523 (SC-79) package: 1.2 mm × 0.8 mm × 0.6 mm body, ultra-small flat lead SMD format with cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal; marking bar aligns with this pin - must connect to lower-potential node in forward bias, e.g., ground side of reverse polarity protection |
| 2 | Anode (A) | Positive terminal; connects to input rail - current flows from Pin 2 → Pin 1 when forward biased |
Key Features
| Feature | Design Value |
|---|---|
| Integrated guard ring | Suppresses edge avalanche at cathode periphery, improving voltage stability and long-term reliability under repetitive surge stress |
| Low VF at 200 mA | 420–500 mV enables <0.1 W conduction loss in 5 V/200 mA loads - critical for battery-powered devices |
| SOD523 footprint | 1.2 mm × 0.8 mm area allows placement in dense portable electronics layouts where larger SOD-123 or SMA packages cannot fit |
| Reflow-only assembly | Validated only for reflow soldering - eliminates risk of thermal damage during hand-soldering or wave processes |
Applications
| USB Power Input Protection | Low-Power DC-DC Output Rectification |
|---|---|
|
Use Scenario: Protecting microcontroller-based peripherals from reverse connection when powered via USB Type-A port. IC Role / Device Role / Timing Role: Reverse polarity protection diode placed in series with VBUS line before LDO or buck converter input. Use Value: 420–500 mV forward drop limits voltage loss to <1.5% of 5 V rail, preserving headroom for downstream regulation. |
Use Scenario: Output rectification in 3.3 V, 150 mA synchronous buck converter where freewheeling path must minimize loss. IC Role / Device Role / Timing Role: Freewheeling Schottky diode providing low-loss return path during high-side FET off-time. Use Value: 20–25 pF junction capacitance avoids ringing or EMI above 100 MHz, supporting clean 2 MHz switching. |
| IoT Sensor Node Rail Clamping | Li-ion Charger Reverse Leakage Suppression |
|
Use Scenario: Clamp transient overvoltage on 3.3 V sensor supply rail caused by inductive load switching in wireless sensor nodes. IC Role / Device Role / Timing Role: Low-capacitance clamp diode tied between rail and ground, conducting only during overvoltage events. Use Value: 2.5–30 µA reverse leakage ensures <1 µW static power drain - extending multi-year battery life in sleep mode. |
Use Scenario: Preventing reverse current flow from battery to charger IC when input power is removed in single-cell Li-ion systems. IC Role / Device Role / Timing Role: Blocking diode in series with battery positive terminal to enforce unidirectional charge path. Use Value: 30 V VR rating safely covers full Li-ion voltage range (2.5–4.4 V) with 6× margin against surge transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ROHM RB520S30 | Same SOD523 package, identical 30 V VR and 200 mA IF(AV), but VF = 450–550 mV @ 200 mA - 30–50 mV higher typical drop | Acceptable where 0.05 V extra conduction loss is tolerable; same thermal footprint and layout compatibility | Select if ROHM supply chain alignment or dual-sourcing is required; no redesign needed |
| Vishay VSKY2202 | SOD-523 package, 20 V VR (not 30 V), 200 mA IF(AV), VF = 380–460 mV @ 200 mA - lower VF but reduced voltage margin | Only suitable for ≤20 V systems; unsuitable for 24 V auxiliary rails or 30 V surge-tolerant designs | Choose only for 3.3/5 V fixed-rail applications where lower VF outweighs voltage derating risk |
Compared with RB521S30YL, RB520S30 offers identical form-fit-function with slightly higher VF, while VSKY2202 trades 10 V VR headroom for marginally lower VF - making RB521S30YL optimal for 30 V-rated, space-limited, low-leakage applications.
Availability
RB521S30YL is available at Aetrix Electronics and suitable for USB power protection, IoT sensor node clamping, low-power DC-DC rectification, and Li-ion charger reverse blocking requiring stable component supply across high-mix, low-volume production runs.
Supply support for RB521S30YL 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic components for automotive, industrial, and consumer markets.
RB521S30YL belongs to Nexperia's Schottky rectifier product line, engineered for ultra-compact, low-loss power management in battery-powered and space-constrained electronics.
FAQ
What is the maximum junction temperature for RB521S30YL?
The absolute maximum junction temperature is 150 °C, validated per IEC 60134 Absolute Maximum Rating System. Operation above this temperature risks permanent parametric shift or metallization failure. Derating curves in Figures 8–10 define safe IF(AV) vs. ambient/solder-point temperature under defined PCB conditions.
Is RB521S30YL suitable for automotive applications?
No - RB521S30YL is not AEC-Q200 qualified and lacks automotive-grade screening, traceability, or extended temperature validation beyond 150 °C junction. Nexperia explicitly states non-automotive qualification in Section 15 of the datasheet; use only in commercial or industrial environments.
How is the cathode identified on the RB521S30YL package?
The cathode is marked by a visible bar on the top surface of the SOD523 package, aligned with Pin 1. This matches the pinning diagram in Table 2 and Figure 12 of the datasheet, and must be oriented toward the lower-potential node in circuit layout.
Can RB521S30YL be hand-soldered?
No - the datasheet specifies reflow soldering as the only recommended method (footnote [4] in Table 5 and Section 13). Hand-soldering risks thermal damage due to localized overheating; the small SOD523 body and internal thermal constraints make controlled reflow essential for reliability.
RB521S30YL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 30 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 200 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 30 µA @ 10 V
- Capacitance @ Vr, F:
- 20pF @ 1V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- 150°C (Max)
RB521S30YL FAQ
1.How can I place an order for RB521S30YL through Aetrix?
Please submit a Request for Quotation (RFQ) for RB521S30YL 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 RB521S30YL reliable?
The price and inventory of RB521S30YL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RB521S30YL is usually 5 days.
3.What payment methods are accepted for RB521S30YL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RB521S30YL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RB521S30YL?
RB521S30YL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RB521S30YL 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 RB521S30YL?
For technical support, including RB521S30YL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RB521S30YL requirements.
6.How does Aetrix verify that RB521S30YL is sourced from the original manufacturer or authorized distributors?
All RB521S30YL 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 RB521S30YL meets industry standards.
7.What is the process for return or replacement of RB521S30YL?
All RB521S30YL units undergo pre-shipment inspection (PSI). If there is an issue with RB521S30YL, 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 RB521S30YL part is unused and in its original packaging.
Return procedure for RB521S30YL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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