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Nexperia USA Inc. RB521S30-QX
- Part No.:
- RB521S30-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
RB521S30-QX.pdf
- Description:
- RB521S30-Q/SOD523/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,126
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Product details
Overview
RB521S30-QX 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 ultra-low 355–410 mV forward voltage at 100 mA - optimized for low-loss rectification in space-constrained automotive power rails and DC-DC converters.
For engineers reviewing the RB521S30-QX datasheet, RB521S30-QX pinout, RB521S30-QX application, or RB521S30-QX equivalent, key selection criteria include its AEC-Q101 qualification, SOD523 (SC-79) 1.2 × 0.8 mm footprint, cathode-marked polarity, and thermal performance on FR4 PCBs with 1 cm² cathode pad.
Technical Context
This Schottky diode uses a planar silicon structure with an integrated guard ring to suppress edge breakdown and improve reliability under transient stress - critical for automotive load-dump and cold-crank conditions. Its low VF enables high efficiency in 3.3 V/5 V buck converter outputs and reverse polarity protection circuits where conduction loss dominates thermal design.
The device operates up to 150 °C junction temperature and is qualified per AEC-Q101 Rev G, with thermal resistance Rth(j-a) of 455 K/W (FR4, standard footprint) and 300 K/W (FR4, 1 cm² cathode pad), supporting stable operation in under-hood modules without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 0.2 A - supports continuous output rectification in sub-500 mW DC-DC stages without derating at Tamb ≤ 120 °C |
| VR | 30 V - suitable for 24 V automotive systems with margin against ISO 7637-2 pulse 5a (±100 V transients clamped externally) |
| VF @ 100 mA | 355–410 mV - reduces conduction loss by >40% vs. standard PN diodes, lowering heat generation in sealed enclosures |
| IR @ 10 V | 2.5–30 µA - ensures minimal leakage in battery-backed keep-alive circuits and always-on domains |
| Cd @ 1 V | 20–25 pF - limits switching noise and EMI in high-frequency SMPS (>1 MHz) without requiring snubbers |
| Rth(j-sp) | 90 K/W - enables direct thermal coupling to PCB copper, simplifying thermal management in compact modules |
Pinout & Package
Encapsulated in the ultra-small SOD523 (SC-79) surface-mount plastic package: 1.2 mm × 0.8 mm × 0.6 mm body, flat lead profile optimized for automated placement and reflow soldering only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Marked side with bar; connects to system ground or negative rail; primary heat path to PCB via cathode pad |
| 2 | Anode (A) | Connects to input/source side; carries forward current into load; no internal thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| Integrated guard ring | Suppresses edge avalanche, enabling stable 30 V blocking without premature failure during voltage transients |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD (HBM ≥ 2 kV), eliminating need for additional qualification testing |
| Low VF temperature coefficient | Forward voltage increases only ~0.15 mV/°C - maintains efficiency across -40 °C to +125 °C ambient range |
| Reflow-only soldering | Designed exclusively for Pb-free reflow profiles (peak ≤ 260 °C); avoids mechanical stress from hand-soldering or wave processes |
Applications
| Automotive Body Control Module (BCM) | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Reverse polarity protection on 12 V supply rail feeding microcontroller, CAN transceiver, and LED drivers. IC Role / Device Role / Timing Role: Unidirectional current gate preventing damage during battery misconnection; no timing function. Use Value: 355 mV VF minimizes voltage drop and self-heating, preserving 11.6 V minimum at 200 mA - sufficient for brown-out-free MCU operation. | Use Scenario: Input clamp diode in USB-C PD sink circuit protecting 5–20 V input stage from backfeed or hot-plug transients. IC Role / Device Role / Timing Role: Fast-turn-on Schottky clamp limiting reverse voltage to <30 V; no signal timing role. Use Value: 25 pF capacitance avoids signal integrity degradation on CC lines while providing robust 30 V standoff during VBUS fault events. |
| Industrial Sensor Node Power Rail | Low-Power Wireless Transceiver Supply |
Use Scenario: Output rectifier in miniature 3.3 V buck converter powering MEMS pressure sensor and BLE SoC. IC Role / Device Role / Timing Role: High-efficiency synchronous rectifier replacement; zero timing dependency. Use Value: 0.2 A rating and 410 mV max VF ensure >92% efficiency at 100 mA load, extending coin-cell life by 18% vs. standard diode alternatives. | Use Scenario: Reverse current blocker between dual power sources (battery + energy harvester) feeding nRF52840 RF SoC. IC Role / Device Role / Timing Role: Low-leakage isolation diode preventing battery drain when harvester is inactive. Use Value: 2.5 µA typical IR at 10 V blocks >99.9% of standby current, reducing quiescent drain to <100 nA per source path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSR0230P2T5G | Same SOD-523 package, 200 mA/30 V rating, but VF = 450–500 mV @ 100 mA (higher conduction loss) | Lacks AEC-Q101 qualification; not recommended for automotive production | Select when cost sensitivity outweighs thermal margin and automotive compliance requirements |
| Vishay SS12 | SOD-123 package (3.7 × 1.6 mm), 200 mA/20 V rating, VF = 500 mV @ 100 mA, higher Rth(j-a) ≈ 200 K/W | Not automotive-qualified; larger footprint incompatible with ultra-compact layouts | Choose only if board space allows larger package and 20 V VR suffices for 12 V nominal systems |
Compared with NSR0230P2T5G and SS12, the RB521S30-QX delivers lower VF, guaranteed AEC-Q101 compliance, and smallest footprint - making it the sole option meeting strict automotive thermal, size, and reliability constraints in sub-200 mA rectification roles.
Availability
RB521S30-QX is available at Aetrix Electronics and suitable for automotive body electronics, USB-C power delivery protection, industrial sensor nodes, and low-power wireless transceiver supplies requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for RB521S30-QX 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 leading Dutch semiconductor manufacturer specializing in high-volume logic, analog, and discrete components, with core expertise in automotive-qualified small-signal and power discretes.
The RB521S30-QX belongs to Nexperia's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for space- and efficiency-critical automotive power management functions including reverse polarity protection and DC-DC output rectification.
FAQ
Is RB521S30-QX compatible with lead-free reflow soldering processes?
Yes - RB521S30-QX is qualified exclusively for Pb-free reflow soldering (JEDEC J-STD-020 compliant), with peak temperature tolerance up to 260 °C. Hand soldering, wave soldering, or infrared rework are not recommended due to thermal stress risks on the ultra-thin SOD523 package and bond wires.
What is the significance of the guard ring in RB521S30-QX?
The integrated guard ring is a doped region surrounding the active Schottky junction that redistributes electric field lines during reverse bias, preventing premature edge breakdown. This enables reliable 30 V blocking capability under automotive transients like load dump and improves long-term stability in high-humidity environments.
Can RB521S30-QX be used in place of a standard PN diode in a 5 V SMPS output stage?
Yes - with VF ≈ 380 mV at 100 mA versus ~700 mV for a typical PN diode, RB521S30-QX reduces conduction loss by over 45%, directly improving efficiency and lowering thermal rise. Its 25 pF capacitance also minimizes switching noise compared to higher-capacitance PN alternatives.
Does the marking 'ZB' on RB521S30-QX indicate date code or lot traceability?
No - 'ZB' is the standardized Nexperia marking code for RB521S30-QX, indicating device type only. Date code and lot traceability are encoded separately in the full reel label and require scanning the 2D barcode on packaging; the top-side 'ZB' mark serves solely for visual identification and polarity confirmation (bar = cathode).
RB521S30-QX 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
RB521S30-QX FAQ
1.How can I place an order for RB521S30-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for RB521S30-QX 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-QX reliable?
The price and inventory of RB521S30-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RB521S30-QX is usually 5 days.
3.What payment methods are accepted for RB521S30-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RB521S30-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RB521S30-QX?
RB521S30-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RB521S30-QX 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-QX?
For technical support, including RB521S30-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RB521S30-QX requirements.
6.How does Aetrix verify that RB521S30-QX is sourced from the original manufacturer or authorized distributors?
All RB521S30-QX 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-QX meets industry standards.
7.What is the process for return or replacement of RB521S30-QX?
All RB521S30-QX units undergo pre-shipment inspection (PSI). If there is an issue with RB521S30-QX, 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-QX part is unused and in its original packaging.
Return procedure for RB521S30-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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