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Nexperia USA Inc. RB521S30,115
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- Part No.:
- RB521S30,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
RB521S30,115.pdf
- Description:
- DIODE SCHOTTKY 30V 200MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:22,780
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Product details
Overview
RB521S30 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 RB521S30 datasheet, RB521S30 pinout, RB521S30 application, or RB521S30 equivalent, this device is selected for low-loss, space-constrained rectification where VF minimization, thermal reliability on FR4 PCBs, and SOD523 footprint compatibility are critical design constraints.
Technical Context
This Schottky diode uses a planar silicon structure with an integrated guard ring to suppress edge breakdown and improve surge robustness under transient reverse bias. Its low VF stems from optimized metal-semiconductor contact and thin epitaxial layer design, enabling high efficiency in low-voltage (<5 V) DC-DC outputs.
Thermal performance is defined by junction-to-ambient resistance (Rth(j-a) = 455 K/W on standard FR4), and its safe operating area is constrained by peak forward surge current (1 A, 8.3 ms half-sine) and maximum junction temperature (150 °C), requiring careful PCB copper layout per Nexperia's mounting pad recommendations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 200 mA - Maximum continuous forward current sustainable on FR4 PCB with standard footprint at Tamb ≤ 120 °C |
| VR | 30 V - Absolute maximum reverse blocking voltage before breakdown; derating required above 85 °C |
| VF @ 200 mA | 420–500 mV - Low conduction loss enabling ≥95% efficiency in 3.3 V buck converter outputs |
| IR @ 10 V | 2.5–30 µA - Ultra-low leakage preserves battery life in always-on low-power circuits |
| Cd @ 1 V | 20–25 pF - Minimal junction capacitance supports >10 MHz switching in synchronous rectifier feedback paths |
| Rth(j-a) | 455 K/W - Thermal resistance defines ambient temperature limit for full-current operation on standard FR4 |
Pinout & Package
Encapsulated in SOD523 (SC-79) ultra-small surface-mount package: 1.2 mm × 0.8 mm × 0.6 mm body, flat lead profile optimized for reflow soldering only. Cathode identified by marking bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal; connects to load ground or lower-potential node; marking bar aligns with this pin |
| 2 | Anode (A) | Positive terminal; connects to input supply or higher-potential node; carries forward current into load |
Key Features
| Feature | Design Value |
|---|---|
| Integrated guard ring | Suppresses edge electric field concentration, improving VR consistency and long-term reliability under repetitive surge stress |
| Ultra-low VF at 200 mA | Reduces forward power loss to <100 mW, critical for thermally limited wearable and IoT PCBs |
| SOD523 footprint | Enables placement in <1.0 mm² board area-ideal for compact USB-C PD, sensor node, and battery management modules |
| Reflow-only assembly | Eliminates wave soldering risk; ensures mechanical integrity and intermetallic bond quality in high-volume SMT lines |
Applications
| USB Power Delivery Protection | IoT Sensor Node Power Rail |
|---|---|
Use Scenario: Reverse polarity protection at USB-C receptacle input of portable medical sensor. IC Role / Device Role / Timing Role: Unidirectional blocking diode preventing damage from misconnected adapters. Use Value: 30 V VR rating covers USB PD 20 V max; 420 mV VF limits voltage drop to <1.5% at 3.3 V rail. |
Use Scenario: Output rectification in miniature 3.3 V buck converter powering BLE SoC and environmental sensors. IC Role / Device Role / Timing Role: Low-loss freewheeling path during switch-off phase of synchronous rectifier topology. Use Value: 25 pF capacitance avoids resonance with 1 µH inductor; 200 mA IF(AV) matches peak load current. |
| Industrial PLC I/O Isolation | Smart Home Battery Backup Circuit |
Use Scenario: Input-side clamping and reverse protection for 24 V DC digital input module. IC Role / Device Role / Timing Role: Standby-blocking element isolating field wiring from internal logic during hot-swap events. Use Value: Guard ring ensures stable 30 V blocking across -40 °C to +85 °C industrial temperature range. |
Use Scenario: OR-ing diode between primary Li-ion battery and backup coin cell in smart thermostat. IC Role / Device Role / Timing Role: Prevents backfeed from main battery into backup cell while minimizing standby drain. Use Value: 2.5 µA typical IR at 10 V extends coin cell shelf life beyond 5 years without active supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Diodes Inc. SDM20U30 | Higher IF(AV) = 300 mA, larger SOD-123 package (2.7 × 1.6 mm), VF = 450 mV @ 200 mA | Better thermal headroom but occupies >3× board area; unsuitable for ultra-dense layouts | Select when higher surge margin or manual rework tolerance is prioritized over size |
| Vishay VSKY2202 | Same SOD523 package, VR = 20 V, VF = 380 mV @ 200 mA, IR = 10 µA @ 10 V | Limited to ≤20 V systems; superior VF/IR trade-off but fails in 24 V industrial inputs | Select only for sub-20 V battery-powered designs where leakage and conduction loss are dominant |
Compared with SDM20U30 and VSKY2202, RB521S30 uniquely balances 30 V blocking, SOD523 miniaturization, and verified 200 mA capability on FR4-making it optimal for space-constrained 24 V–30 V industrial and USB-C auxiliary power paths.
Availability
RB521S30 is available at Aetrix Electronics and suitable for USB-C PD protection, IoT sensor node power rails, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for RB521S30 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.
RB521S30 belongs to Nexperia's Schottky Rectifier product line, engineered specifically for low-VF, high-density power management in consumer, industrial, and computing applications where board space and thermal budget are tightly constrained.
FAQ
Is RB521S30 suitable for automotive applications?
No. RB521S30 is not AEC-Q200 qualified and lacks automotive-specific testing or qualification. Nexperia explicitly states non-automotive status in its legal disclaimers, and the device is intended for industrial, consumer, and computing use only. Automotive designs require parts explicitly marked "automotive qualified" in the datasheet.
What is the recommended PCB layout for thermal performance?
For rated 200 mA operation, Nexperia specifies a 1 cm² tin-plated copper pad connected to pin 1 (cathode) on FR4. This reduces Rth(j-a) from 455 K/W to 300 K/W. The anode pad must remain minimal to avoid parasitic capacitance; no thermal relief is permitted on cathode land per reflow guidelines.
Can RB521S30 be used in place of a general-purpose PN diode like 1N4148?
No-it is not a drop-in replacement. RB521S30 has 30 V VR versus 1N4148's 100 V, and its Schottky construction yields near-zero reverse recovery time but higher leakage. It excels in low-VF, high-frequency rectification-not signal clamping or high-voltage isolation where 1N4148 is specified.
Does the marking code 'ZB' correspond to RB521S30 across all production lots?
Yes. Table 4 of the datasheet confirms ZB is the sole marking code for RB521S30. No alternate codes or date-code variants affect part identity; ZB-marked units are fully compliant with the v.4 20260806 datasheet specifications and SOD523 mechanical outline.
RB521S30,115 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:
- 25pF @ 1V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- 150°C (Max)
RB521S30,115 FAQ
1.How can I place an order for RB521S30,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for RB521S30,115 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 RB521S30,115 reliable?
The price and inventory of RB521S30,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RB521S30,115 is usually 5 days.
3.What payment methods are accepted for RB521S30,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RB521S30,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RB521S30,115?
RB521S30,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RB521S30,115 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 RB521S30,115?
For technical support, including RB521S30,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RB521S30,115 requirements.
6.How does Aetrix verify that RB521S30,115 is sourced from the original manufacturer or authorized distributors?
All RB521S30,115 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 RB521S30,115 meets industry standards.
7.What is the process for return or replacement of RB521S30,115?
All RB521S30,115 units undergo pre-shipment inspection (PSI). If there is an issue with RB521S30,115, 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 RB521S30,115 part is unused and in its original packaging.
Return procedure for RB521S30,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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