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Nexperia USA Inc. RB521S30-QF
- Part No.:
- RB521S30-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
RB521S30-QF.pdf
- Description:
- RB521S30-Q/SOD523/SC-79
- Quantity:
- Payment:
- Shipping:
Inventory:6,894
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Product details
Overview
RB521S30-QF 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 and qualified to AEC-Q101 for automotive use in space-constrained DC-DC converters.
For engineers reviewing the RB521S30-QF datasheet, RB521S30-QF pinout, RB521S30-QF application, or RB521S30-QF equivalent, this device is selected for low-loss, high-efficiency rectification in thermally sensitive, miniaturized power rails where low VF and AEC-Q101 compliance are mandatory.
Technical Context
This Schottky diode employs a planar die structure with an integrated guard ring to suppress edge breakdown under high electric field stress, enabling stable 30 V reverse blocking while maintaining low leakage (≤30 µA at 10 V). Its junction-to-solder-point thermal resistance is 90 K/W, optimized for reflow-soldered FR4 PCBs with cathode-side thermal pad.
The device operates within −55 °C to +150 °C junction temperature range and delivers 0.2 A average forward current under square-wave conditions (δ = 0.5, f = 20 kHz) with Tsp ≤ 140 °C - confirming suitability for pulsed automotive power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 0.2 A - supports continuous output rectification in sub-1W SMPS stages without forced cooling |
| VR | 30 V - enables use in 24 V automotive systems with margin against load-dump transients |
| VF @ 100 mA | 355–410 mV - reduces conduction loss by >40% vs. standard silicon diodes, improving efficiency in battery-powered devices |
| IR @ 10 V | ≤30 µA - minimizes standby power loss in always-on automotive modules |
| Cd @ 1 V | 20–25 pF - ensures fast switching with low capacitive loading in high-frequency (>1 MHz) buck regulators |
| Rth(j-sp) | 90 K/W - allows direct thermal coupling to PCB copper, supporting 275 mW dissipation on standard FR4 footprint |
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) | Connected to negative rail or output return; marking bar identifies this terminal; primary heat path to PCB via cathode solder pad |
| 2 | Anode (A) | Connected to input or switching node; carries full forward current; minimal thermal contribution to junction heating |
Key Features
| Feature | Design Value |
|---|---|
| Integrated guard ring | Suppresses edge breakdown at high VR, ensuring consistent 30 V rating across process variation and temperature |
| AEC-Q101 qualification | Validated for automotive underhood applications including engine control units and ADAS power supplies |
| Ultra-low VF profile | 355 mV typ. at 100 mA enables >92% efficiency in 3.3 V/0.2 A buck converter at light load |
| Reflow-only assembly | Compatible with standard Pb-free reflow profiles; no hand-soldering or wave soldering permitted per datasheet |
| 1 cm² cathode thermal pad | Enables 0.2 A operation at Tamb = 120 °C on FR4, critical for compact ECU designs |
Applications
| Automotive Body Control Module (BCM) | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Reverse polarity protection for 12 V supply input in door module electronics. IC Role / Device Role / Timing Role: Unidirectional blocking diode placed between connector and LDO input. Use Value: 30 µA max IR prevents battery drain during vehicle sleep mode; 30 V VR withstands jump-start surges. |
Use Scenario: Output OR-ing diode in dual-source USB-C PD adapter (5 V/9 V/15 V). IC Role / Device Role / Timing Role: Low-VF path selector preventing backfeed between parallel buck outputs. Use Value: 355 mV VF reduces voltage drop by 0.25 V vs. standard Schottky, preserving regulation margin at 3 A load. |
| Industrial Sensor Node Power Rail | Low-Power Wearable Charger IC Input Stage |
Use Scenario: Rectification of 5 V AC-DC auxiliary supply feeding BLE MCU and analog sensor front-end. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacement in flyback-derived supply. Use Value: 20–25 pF capacitance avoids resonance with 10 µH output inductor at 2 MHz switching frequency. |
Use Scenario: Input protection and rectification in linear charger IC powered from micro-USB. IC Role / Device Role / Timing Role: Polarity-correcting diode between USB VBUS and charger VIN pin. Use Value: 0.2 A IF(AV) supports 500 mA charging current with 40 °C ambient rise on 1 cm² cathode pad. |
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 mV min at 100 mA - 95 mV higher typical VF | Higher conduction loss reduces efficiency in battery-operated wearables by ~1.2% at 100 mA load | Select when legacy ON Semi BOM alignment is required; verify thermal derating due to higher VF-induced self-heating |
| Vishay VS-2EDL02LMTR-M3 | SOD-323 package (1.7 mm × 1.25 mm), 200 mA/30 V, VF = 370 mV typ at 100 mA, but not AEC-Q101 qualified | Larger footprint increases board area by 42%; lacks automotive qualification for under-hood deployment | Acceptable for industrial IoT gateways where AEC-Q101 is not mandated and PCB real estate permits larger package |
Compared with NSR0230P2T5G and VS-2EDL02LMTR-M3, RB521S30-QF delivers the lowest VF in its class with certified automotive reliability and smallest footprint - making it optimal for next-gen compact automotive ECUs and portable medical sensors requiring zero standby leakage.
Availability
RB521S30-QF is available at Aetrix Electronics and suitable for automotive body control modules, USB-C PD clamp circuits, industrial sensor nodes, and low-power wearable charger designs requiring stable component supply with guaranteed long-term continuity.
Supply support for RB521S30-QF 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 components and advanced packaging.
RB521S30-QF belongs to Nexperia's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for space-constrained, thermally demanding automotive and industrial power conversion applications.
FAQ
Is RB521S30-QF compatible with lead-free reflow soldering processes?
Yes - RB521S30-QF is qualified exclusively for Pb-free reflow soldering per J-STD-020; peak temperature must not exceed 260 °C for ≤30 seconds. Wave soldering and hand soldering are explicitly prohibited per datasheet Section 13, as they risk thermal damage to the guard ring structure and degrade VR stability.
What is the maximum ambient temperature for 0.2 A continuous operation on standard FR4?
On standard FR4 PCB (single-sided copper, tin-plated, no extended cathode pad), RB521S30-QF supports 0.2 A average forward current up to 120 °C ambient temperature, as confirmed in Figure 8 of the datasheet - provided solder point temperature remains ≤140 °C and duty cycle is 0.5 at 20 kHz.
Does the marking 'ZB' correspond to RB521S30-QF?
Yes - Table 4 confirms 'ZB' is the official marking code for RB521S30-QF on the SOD523 package body; the bar adjacent to the 'ZB' identifies Pin 1 (cathode), matching the pinning diagram in Table 2 and Figure 12.
Can RB521S30-QF be used in reverse polarity protection for 24 V systems?
Yes - with 30 V VR rating and 150 °C max junction temperature, RB521S30-QF provides 6 V margin above nominal 24 V automotive systems and withstands ISO 7637-2 pulse 1 (−150 V/50 ms) when paired with appropriate TVS clamping, as validated in AEC-Q101 stress testing.
RB521S30-QF 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-QF FAQ
1.How can I place an order for RB521S30-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for RB521S30-QF 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-QF reliable?
The price and inventory of RB521S30-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RB521S30-QF is usually 5 days.
3.What payment methods are accepted for RB521S30-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RB521S30-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RB521S30-QF?
RB521S30-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RB521S30-QF 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-QF?
For technical support, including RB521S30-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RB521S30-QF requirements.
6.How does Aetrix verify that RB521S30-QF is sourced from the original manufacturer or authorized distributors?
All RB521S30-QF 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-QF meets industry standards.
7.What is the process for return or replacement of RB521S30-QF?
All RB521S30-QF units undergo pre-shipment inspection (PSI). If there is an issue with RB521S30-QF, 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-QF part is unused and in its original packaging.
Return procedure for RB521S30-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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