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Nexperia USA Inc. BAS521,315
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- Part No.:
- BAS521,315
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BAS521,315.pdf
- Description:
- DIODE GEN PURP 300V 250MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
BAS521,315 from Nexperia is a high-voltage switching diode in SOD523 (SC-79) package, rated for 300 V repetitive peak reverse voltage, 250 mA forward current, and 16–50 ns reverse recovery time. It serves as a fast, compact rectifier or clamping device in DC-DC converters, flyback snubbers, and signal-level high-voltage switching circuits.
For engineers reviewing the BAS521,315 datasheet, BAS521,315 pinout, BAS521,315 application, or BAS521,315 equivalent, key selection criteria include verified trr ≤ 50 ns performance at IF = 30 mA, VR = 250 V leakage < 150 nA at 25 °C, thermal resistance Rth(j-sp) = 120 K/W, and SOD523 footprint compatibility with space-constrained PCB layouts.
Technical Context
The BAS521,315 employs a planar silicon epitaxial structure optimized for high-speed minority-carrier switching with controlled carrier lifetime. Its junction design enables low forward voltage (VF = 0.95–1.1 V @ 100 mA) while sustaining 300 V reverse blocking capability under repetitive surge conditions.
Thermal performance is defined by junction-to-solder-point resistance of 120 K/W, requiring reflow-only soldering on FR4 with cathode-tab thermal pad. The device operates up to 150 °C junction temperature and exhibits diode capacitance of 0.4–5 pF at 0 V bias and 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - supports input rectification in 24–48 V industrial power supplies with safety margin against transients |
| trr | 16–50 ns - enables operation in >1 MHz switching topologies without excessive switching loss |
| IF | 250 mA continuous - sufficient for signal-level switching and auxiliary rail clamping in SMPS controllers |
| VF | 0.95–1.1 V @ 100 mA - minimizes conduction loss in low-current high-side clamp paths |
| IR | 30–150 nA @ VR = 250 V, 25 °C - ensures negligible leakage in high-impedance sensing or timing circuits |
| Cd | 0.4–5 pF @ VR = 0 V, 1 MHz - preserves signal integrity in RF detector or high-frequency sampling applications |
Pinout & Package
Encapsulated in ultra-small SOD523 (SC-79) plastic SMD package: 1.2 mm × 0.8 mm × 0.6 mm body, flat lead, cathode-tab thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K (cathode) | Primary current exit node; thermally connected to solder pad for enhanced heat dissipation |
| 2 | A (anode) | Current entry node; electrically isolated from thermal pad; used for forward bias connection |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | trr ≤ 50 ns enables use in 1–2 MHz DC-DC converter snubbers without efficiency penalty |
| High reverse voltage rating | 300 V VRRM allows direct replacement of older 200 V diodes in legacy 24/48 V telecom power designs |
| Ultra-compact SMD package | SOD523 footprint saves >60% board area vs. SOD323, critical for wearable and IoT sensor modules |
| Low leakage current | IR ≤ 150 nA at 250 V ensures stable bias in precision voltage reference or analog front-end protection |
Applications
| DC-DC Converter Snubber | Flyback Clamp Circuit |
|---|---|
Use Scenario: Suppresses voltage spikes across primary MOSFET in isolated flyback converters operating at 500 kHz–1 MHz. IC Role / Device Role: Fast-recovery clamp diode in RCD snubber network. Use Value: 16 ns typical trr limits ringback energy; 300 V rating accommodates 2× reflected output voltage plus margin. |
Use Scenario: Clamps transformer leakage inductance energy during MOSFET turn-off in offline AC-DC adapters. IC Role / Device Role: High-voltage transient suppressor tied between drain and auxiliary winding. Use Value: Low VF reduces clamp power loss; SOD523 size fits tight layout near transformer pins. |
| Signal-Level HV Switching | ESD Protection Interface |
Use Scenario: Routes high-voltage control signals (e.g., 100–250 V gate drive enable lines) in motor driver ICs. IC Role / Device Role: Bidirectional level-shifting switch with fast polarity reversal. Use Value: 50 ns max trr ensures clean edge transmission; 0.4 pF Cd avoids signal distortion at >10 MHz. |
Use Scenario: Protects analog inputs of industrial PLC modules exposed to ±2 kV contact ESD per IEC 61000-4-2. IC Role / Device Role: Low-capacitance series clamp limiting transient current into downstream amplifier. Use Value: 5 pF max Cd preserves bandwidth; 300 V standoff prevents breakdown during ESD event. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSR0230P2T5G | Lower VRRM (30 V), higher IF (300 mA), faster trr (4 ns), same SOD-523 package | Restricted to ≤30 V systems; unsuitable for 24 V+ snubbers or HV clamping | Select only for low-voltage, ultra-high-speed logic-level switching where 300 V rating is unnecessary |
| Vishay ES1JHM3/84A | Higher VRRM (600 V), slower trr (75 ns), larger DO-214AC package, IF = 1 A | Requires 3× PCB area; thermal mass delays response in high-frequency snubbers | Prefer for ruggedized 400–600 V industrial power supplies where speed is secondary to voltage margin |
Compared with NSR0230P2T5G and ES1JHM3/84A, BAS521,315 uniquely balances 300 V standoff, sub-50 ns recovery, and SOD523 miniaturization-making it optimal for space-constrained, medium-voltage (>24 V), high-frequency (>500 kHz) switching nodes.
Availability
BAS521,315 is available at Aetrix Electronics and suitable for DC-DC converter snubbers, flyback clamp circuits, signal-level HV switching, and ESD protection interfaces requiring stable component supply and consistent SOD523 packaging.
Supply support for BAS521,315 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 standard products including logic, discrete, and MOSFETs, with manufacturing rooted in process optimization and automotive-grade quality systems.
The BAS521,315 belongs to Nexperia's high-voltage switching diode product line, engineered specifically for compact, high-efficiency power conversion and signal conditioning in industrial, telecom, and consumer power supplies.
FAQ
Is BAS521,315 suitable for reflow soldering only?
Yes. The datasheet explicitly states reflow soldering is the only recommended method due to thermal constraints of the SOD523 package and cathode-tab construction. Wave or hand soldering risks exceeding Tsp = 90 °C at the cathode solder point, potentially degrading reliability or causing delamination.
What is the maximum allowable ambient temperature for continuous 250 mA operation?
At 250 mA forward current, the derating curve (Figure 5) shows full-rated current is only permissible up to approximately 70 °C ambient. Above that, current must be linearly reduced to maintain Tj ≤ 150 °C, reaching zero at ~150 °C ambient.
Does BAS521,315 have automotive qualification?
No. The datasheet contains no AEC-Q200 or automotive qualification statement. Nexperia explicitly disclaims suitability for automotive use unless expressly marked as automotive qualified-BAS521,315 is designated for industrial and general-purpose applications only.
How does the 120 K/W Rth(j-sp) value impact thermal design?
Rth(j-sp) = 120 K/W defines the thermal path from junction to cathode solder point-not ambient. Effective cooling requires a dedicated thermal pad under the cathode tab with adequate copper area and via stitching to internal ground planes to realize the full benefit of this low-resistance path.
BAS521,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 250mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 150 nA @ 250 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- 150°C (Max)
BAS521,315 FAQ
1.How can I place an order for BAS521,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS521,315 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 BAS521,315 reliable?
The price and inventory of BAS521,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS521,315 is usually 5 days.
3.What payment methods are accepted for BAS521,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS521,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS521,315?
BAS521,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS521,315 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 BAS521,315?
For technical support, including BAS521,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS521,315 requirements.
6.How does Aetrix verify that BAS521,315 is sourced from the original manufacturer or authorized distributors?
All BAS521,315 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 BAS521,315 meets industry standards.
7.What is the process for return or replacement of BAS521,315?
All BAS521,315 units undergo pre-shipment inspection (PSI). If there is an issue with BAS521,315, 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 BAS521,315 part is unused and in its original packaging.
Return procedure for BAS521,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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