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Nexperia USA Inc. BAS21W,115
- Part No.:
- BAS21W,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAS21W,115.pdf
- Description:
- DIODE GEN PURP 250V 225MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:1,594
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Product details
Overview
BAS21W from Nexperia is a high-voltage switching diode in SOT323 (SC-70) package, rated for 250 V reverse voltage, 225 mA forward current, and 50 ns reverse recovery time. It serves as a fast, low-leakage clamping and polarity protection device in automotive power management and industrial HV DC-DC converters.
For engineers reviewing the BAS21W datasheet, BAS21W pinout, BAS21W application, or BAS21W equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data, and real-world use context for high-voltage switching design validation.
Technical Context
The BAS21W is a single silicon planar epitaxial switching diode optimized for high-speed, high-voltage operation. Its 2 pF capacitance at 0 V and 50 ns trr enable clean signal edge handling in flyback snubbers and ESD-clamped interfaces.
Designed with an isolated cathode-anode structure and no internal connection on pin 2, it supports unidirectional conduction with minimal parasitic coupling. The AEC-Q101 qualification confirms robustness under automotive thermal cycling (−40 °C to +150 °C) and humidity stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 250 V - supports direct integration into 200 V rail clamping without derating |
| IF (Forward Current) | 225 mA continuous - sufficient for signal-level switching and auxiliary bias paths |
| trr (Reverse Recovery Time) | 50 ns - enables stable operation up to ~3 MHz switching in non-resonant topologies |
| IR (Reverse Leakage) | 100 nA @ 200 V, 25 °C - ensures low standby power loss in always-on circuits |
| Cd (Diode Capacitance) | 2 pF @ 0 V, 1 MHz - minimizes capacitive loading on high-impedance control nodes |
| Rth(j-a) | 625 K/W - requires PCB copper area planning for >100 mW dissipation in free air |
Pinout & Package
Package: SOT323 (SC-70), 3-terminal surface-mount plastic package, dimensions 2.0 mm × 1.25 mm × 0.95 mm, 1.3 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to positive-side switching node |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder mask required |
| 3 | Cathode (K) | Forward current exit; ties to ground or return path for clamping function |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | 50 ns trr enables use in 2–3 MHz DC-DC feedback loops without oscillation risk |
| AEC-Q101 qualification | Validated for automotive under-hood applications including engine control and body electronics |
| Low leakage current | 100 nA @ 200 V ensures <1 µW standby loss in battery-backed systems |
| Small footprint | SOT323 saves >60% board area vs. SOT23 while maintaining thermal performance via solder-point conduction |
Applications
| Automotive Engine Control Unit (ECU) | Industrial HV DC-DC Converter |
|---|---|
Use Scenario: Clamping transient spikes on 12 V/24 V supply rails during load dump events. IC Role / Device Role / Timing Role: Fast-recovery voltage clamp placed across MOSFET drain-source or relay coil. Use Value: Prevents overvoltage damage to microcontrollers and gate drivers using only 250 V VR rating and 50 ns response. |
Use Scenario: Reverse polarity protection at input of isolated 48 V–12 V buck converter. IC Role / Device Role / Timing Role: Series-connected high-voltage blocking diode in hot-swap path. Use Value: 225 mA IF rating and 100 nA IR ensure low insertion loss and zero standby drain in always-on backup systems. |
| Telecom Power Supply Snubber | Medical Diagnostic Equipment Bias Rail |
Use Scenario: RC snubber network across flyback transformer primary winding. IC Role / Device Role / Timing Role: High-speed freewheeling path for leakage inductance energy. Use Value: 2 pF capacitance avoids resonance shift; 50 ns trr prevents tail current overlap with main switch turn-on. |
Use Scenario: Isolation and voltage translation in analog front-end bias generation. IC Role / Device Role / Timing Role: Signal-level clamping diode protecting ADC reference inputs from ESD transients. Use Value: AEC-Q101 reliability and 100 nA IR preserve precision reference stability over temperature and lifetime. |
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 MMBD2102LT1G | 200 V VR, 200 mA IF, 50 ns trr, same SOT-323 package | Lacks AEC-Q101 qualification; not validated for automotive thermal cycling | Select when cost sensitivity outweighs automotive qualification requirements |
| Vishay BAV21W | 250 V VR, 250 mA IF, 50 ns trr, SOD-123 package (larger footprint) | Higher IF but 3× larger PCB area; Rth(j-a) = 500 K/W due to different thermal path | Choose when higher current margin is needed and board space permits SOD-123 layout |
Compared with MMBD2102LT1G and BAV21W, the BAS21W uniquely combines AEC-Q101 compliance, 250 V rating, and SOT323 miniaturization-making it optimal for space-constrained automotive modules where reliability and footprint are co-prioritized.
Availability
BAS21W is available at Aetrix Electronics and suitable for automotive ECU designs, industrial HV DC-DC converters, and telecom snubber circuits requiring stable component supply and long-term lifecycle assurance.
Supply support for BAS21W 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 efficient manufacturing.
The BAS21W belongs to Nexperia's high-voltage switching diode product line, engineered specifically for fast transient suppression and polarity protection in harsh-environment power systems.
FAQ
Is BAS21W suitable for reverse polarity protection in 24 V automotive systems?
Yes. With 250 V reverse voltage rating and AEC-Q101 qualification, the BAS21W withstands load dump transients up to ISO 7637-2 Pulse 5a (120 V peak) and provides reliable series blocking in 24 V battery-fed circuits. Its 100 nA leakage ensures negligible standby current draw.
What is the maximum ambient temperature for continuous 225 mA operation?
At 225 mA continuous forward current, the BAS21W requires ambient temperature ≤25 °C on FR4 PCB with standard footprint to stay within its 150 °C junction limit. Derating begins above 25 °C per Fig. 5: at 85 °C Tamb, max IF drops to ~120 mA.
Can pin 2 be grounded or left floating in PCB layout?
Pin 2 is internally not connected and must remain electrically floating-neither grounded nor tied to any net. PCB layout should omit solder mask opening and avoid routing traces or copper pours beneath it to prevent unintended coupling or solder bridging.
How does BAS21W's 2 pF capacitance impact high-frequency signal integrity?
At 1 MHz and 0 V bias, the 2 pF junction capacitance introduces <0.3 Ω reactance at 100 MHz, making it suitable for clamping RF-coupled transients without distorting digital control signals. It avoids resonance issues common with >5 pF diodes in fast-switching gate-drive paths.
BAS21W,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 250 V
- Current - Average Rectified (Io):
- 225mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 200 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 200 V
- Capacitance @ Vr, F:
- 2pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
- Operating Temperature - Junction:
- 150°C (Max)
BAS21W,115 FAQ
1.How can I place an order for BAS21W,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21W,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 BAS21W,115 reliable?
The price and inventory of BAS21W,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21W,115 is usually 5 days.
3.What payment methods are accepted for BAS21W,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21W,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21W,115?
BAS21W,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21W,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 BAS21W,115?
For technical support, including BAS21W,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21W,115 requirements.
6.How does Aetrix verify that BAS21W,115 is sourced from the original manufacturer or authorized distributors?
All BAS21W,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 BAS21W,115 meets industry standards.
7.What is the process for return or replacement of BAS21W,115?
All BAS21W,115 units undergo pre-shipment inspection (PSI). If there is an issue with BAS21W,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 BAS21W,115 part is unused and in its original packaging.
Return procedure for BAS21W,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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