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Nexperia USA Inc. BAS521,115
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- Part No.:
- BAS521,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BAS521,115.pdf
- Description:
- DIODE GEN PURP 300V 250MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:418,428
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Product details
Overview
BAS521,115 from Nexperia is a high-voltage switching diode in SOD523 (SC-79) package, designed for fast transient response in off-line power supplies and signal clamping circuits. It delivers 300 V repetitive peak reverse voltage, ≤50 ns reverse recovery time, and 250 mA forward current rating at Tsp ≤ 90 °C - enabling reliable operation in compact AC/DC adapters and ESD-protected I/O stages.
For engineers reviewing the BAS521,115 datasheet, BAS521,115 pinout, BAS521,115 application, or BAS521,115 equivalent, key selection criteria include verified trr ≤ 50 ns 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 high-density PCB layouts.
Technical Context
The BAS521,115 employs a planar epitaxial silicon structure optimized for high-speed minority-carrier switching under repetitive high-voltage stress. Its junction design achieves low stored charge (Qrr) and controlled carrier lifetime to meet trr ≤ 50 ns while sustaining 300 V VRRM.
Thermal performance is defined by junction-to-solder-point resistance (Rth(j-sp) = 120 K/W), requiring reflow-only soldering on FR4 with cathode-tab thermal pad. The device operates across –65 °C to +150 °C ambient, with derated forward current above 75 °C per Fig. 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - supports primary-side snubbers and flyback clamp circuits up to 230 VAC mains input. |
| trr | 16–50 ns - enables >1 MHz switching in resonant converters without excessive switching loss. |
| IF | 250 mA continuous - sufficient for bias supply rectification and logic-level signal steering. |
| VF | 0.95–1.1 V @ 100 mA - minimizes conduction loss in low-power auxiliary rails. |
| IR | 30–150 nA @ VR = 250 V, 25 °C - ensures negligible leakage in high-impedance sensing nodes. |
| Cd | 0.4–5 pF @ VR = 0 V, 1 MHz - preserves signal integrity in RF detector and timing applications. |
Pinout & Package
Package: SOD523 (SC-79), ultra-small surface-mount plastic package measuring 1.2 mm × 0.8 mm × 0.6 mm with flat leads and cathode tab solder point.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K (cathode) | Primary heat path via solder point; must be connected to thermal pad for Rth(j-sp) = 120 K/W performance. |
| 2 | A (anode) | Forward current entry point; no thermal relief required; compatible with standard SMD reflow profiles. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | trr ≤ 50 ns enables use in >1 MHz DC-DC controllers without added snubber losses. |
| High-voltage blocking | VRRM = 300 V allows direct integration into 230 VAC line-connected circuits without series stacking. |
| Ultra-compact footprint | SOD523 (1.2 × 0.8 mm) saves >60% board area vs. SOD323, critical for space-constrained IoT modules. |
| Low leakage current | IR ≤ 150 nA at 250 V ensures stable reference voltage in precision analog front-ends. |
Applications
| AC/DC Adapter Snubber Diode | USB Port ESD Clamp |
|---|---|
|
Use Scenario: Clamps voltage spikes across MOSFET drains in flyback converter RCD snubber networks. IC Role / Device Role: High-voltage transient suppressor with fast turn-off to minimize energy dissipation. Use Value: 300 V VRRM and 50 ns trr reduce snubber resistor heating and improve efficiency by 2–3% over slower alternatives. |
Use Scenario: Protects USB 2.0 data lines from ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role: Low-capacitance (≤5 pF), low-leakage steering diode in bidirectional TVS array. Use Value: 0.4–5 pF capacitance preserves signal rise time (<1 ns degradation), avoiding USB eye diagram closure. |
| Industrial Sensor Signal Conditioning | Smart Meter Voltage Monitoring |
|
Use Scenario: Rectifies low-amplitude AC signals from current transformers before ADC sampling. IC Role / Device Role: Precision signal-path diode with minimal forward voltage variation over temperature. Use Value: VF = 0.95–1.1 V (typ.) and <150 nA IR ensure <0.5% gain error in 24-bit metrology ADC front-ends. |
Use Scenario: Isolates and conditions 230 VAC phase voltage for microcontroller-based RMS measurement. IC Role / Device Role: High-reliability input-stage diode in resistive divider feed network. Use Value: 150 °C max junction temperature and –65 °C min storage rating support extended outdoor deployment life. |
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 MMBD7000LT1G | VRRM = 100 V, trr = 4 ns, SOT-23 package (2.9 × 1.3 mm) | Lower voltage rating limits use to secondary-side circuits only; smaller trr benefits ultra-high-frequency designs. | Select when speed > voltage rating and board space permits larger SOT-23 footprint. |
| Vishay ES1J | VRRM = 600 V, trr = 35 ns, DO-214AC (SMA) package (4.5 × 2.7 mm) | Higher voltage margin suits industrial 480 VAC systems; larger size increases layout area and thermal mass. | Select when system-level surge immunity requires >300 V margin and thermal cycling robustness is prioritized. |
Compared with MMBD7000LT1G and ES1J, the BAS521,115 uniquely balances 300 V capability, 50 ns trr, and 1.2 mm × 0.8 mm footprint - making it optimal for miniaturized mains-connected consumer electronics where both voltage headroom and density are constrained.
Availability
BAS521,115 is available at Aetrix Electronics and suitable for AC/DC adapter design, USB interface protection, industrial sensor signal conditioning, and smart meter voltage monitoring requiring stable component supply and long-term production continuity.
Supply support for BAS521,115 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.
The BAS521,115 belongs to Nexperia's high-voltage switching diode product line, engineered specifically for compact, high-efficiency power conversion and robust signal integrity in cost-sensitive consumer and industrial equipment.
FAQ
Is BAS521,115 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. Hand soldering risks exceeding the 90 °C solder point temperature limit (Tsp) and degrading Rth(j-sp) performance or causing intermetallic failure at the cathode tab.
What is the maximum allowable forward current at 100 °C ambient?
Per Figure 5 (derating curve), the forward current must be reduced to approximately 120 mA at Tamb = 100 °C. This is derived from linear derating starting at 250 mA at 90 °C Tsp, with full derating to zero at 150 °C junction temperature - consistent with the 500 mW Ptot limit and Rth(j-a) = 500 K/W.
Does BAS521,115 have automotive qualification?
No. The Nexperia datasheet contains no AEC-Q101 or automotive qualification statement. Legal section 15 explicitly states: "Unless this data sheet expressly states that this specific Nexperia product is automotive qualified, the product is not suitable for automotive use." It is rated for industrial and consumer applications only.
How does the marking code 'L4' map to BAS521,115?
Per Table 4, 'L4' is the official top-side marking for BAS521 devices in SOD523 packaging. The '115' in the orderable part number denotes tape-and-reel packaging per JEDEC standard J-STD-020, with 10,000 units per reel - confirmed in Nexperia's ordering information table and packaging specification SOD523.
BAS521,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- 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)
BAS521,115 FAQ
1.How can I place an order for BAS521,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS521,115 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 BAS521,115 reliable?
The price and inventory of BAS521,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS521,115 is usually 5 days.
3.What payment methods are accepted for BAS521,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS521,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS521,115?
BAS521,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS521,115 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 BAS521,115?
For technical support, including BAS521,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS521,115 requirements.
6.How does Aetrix verify that BAS521,115 is sourced from the original manufacturer or authorized distributors?
All BAS521,115 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 BAS521,115 meets industry standards.
7.What is the process for return or replacement of BAS521,115?
All BAS521,115 units undergo pre-shipment inspection (PSI). If there is an issue with BAS521,115, 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 BAS521,115 part is unused and in its original packaging.
Return procedure for BAS521,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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