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Nexperia USA Inc. BAS21LL-QYL
- Part No.:
- BAS21LL-QYL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SOD-882
- Datasheet:
-
BAS21LL-QYL.pdf
- Description:
- BAS21LL-Q/SOD882/DFN1006-2
- Quantity:
- Payment:
- Shipping:
Inventory:5,316
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Product details
Overview
BAS21LL-Q from Nexperia is a high-voltage switching diode in a DFN1006-2 (SOD882) ultra-small surface-mount package, rated for 250 V repetitive peak reverse voltage (VRRM), 50 ns reverse recovery time (trr), and 100 nA reverse leakage at 200 V - designed for automotive-grade clamping and polarity protection circuits operating up to 150 °C junction temperature.
For engineers reviewing the BAS21LL-Q datasheet, BAS21LL-Q pinout, BAS21LL-Q application, or BAS21LL-Q equivalent, this device supports high-speed switching in space-constrained automotive ECUs, reverse polarity protection in 12 V/24 V battery interfaces, and voltage clamping in transient-prone sensor signal paths where low capacitance (≤2 pF) and AEC-Q101 qualification are mandatory.
Technical Context
The BAS21LL-Q employs a planar epitaxial silicon structure optimized for fast minority-carrier recombination, enabling ≤50 ns trr under IF = 30 mA / IR = 30 mA test conditions with 100 Ω load. Its low 2 pF capacitance at 0 V bias and 1 MHz supports minimal signal distortion in RF-coupled or high-frequency switching nodes.
Thermally, it features Rth(j-a) = 375 K/W on FR4 (single-sided copper) and Rth(j-sp) = 45 K/W to cathode solder point, allowing reliable operation at 150 °C junction temperature when mounted per SOD882 footprint with 1 cm² cathode pad - critical for under-hood automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 250 V - Withstands repetitive transients up to 250 V without breakdown in automotive load-dump scenarios. |
| trr | 50 ns - Enables clean switching at >1 MHz frequencies in DC-DC flyback snubbers and signal routing. |
| IR @ 200 V | 100 nA - Ensures negligible leakage current in high-impedance voltage clamp networks at 25 °C. |
| Cd @ 0 V | 2 pF - Minimizes capacitive loading on high-speed digital or analog signal lines. |
| IF max | 330 mA continuous - Supports sustained current in low-power logic-level protection and sensing circuits. |
| Tj max | 150 °C - Qualified for under-hood automotive environments without derating in standard PCB mounting. |
Pinout & Package
Package: DFN1006-2 (SOD882), 1.0 mm × 0.6 mm × 0.48 mm body, 0.65 mm pitch, leadless, cathode-marked top-side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K (cathode) | Connected to higher-potential node in reverse-biased clamping; primary thermal path to PCB via exposed cathode pad. |
| 2 | A (anode) | Connected to lower-potential node; carries forward current during conduction; no thermal relief required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Stress-tested for automotive reliability: HTOL, TC, HAST, UHAST, ESD-HBM ≥ 2 kV - suitable for ASIL-B systems without additional qualification. |
| Ultra-small footprint | DFN1006-2 (0.6 mm × 1.0 mm) saves >70% board area vs. SOD123 - enables dense placement in ADAS camera modules and radar power supplies. |
| Low VF @ 200 mA | 1.25 V - Reduces forward conduction loss in 12 V reverse-polarity protection, improving system efficiency over Schottky alternatives with higher VF drift. |
| High VR rating | 200 V working reverse voltage - eliminates need for series diodes in 24 V commercial vehicle battery inputs subjected to ISO 7637-2 Pulse 5a (120 V). |
Applications
| Automotive Battery Protection | High-Speed Signal Clamping |
|---|---|
|
Use Scenario: Reverse polarity protection on 12 V/24 V battery input of engine control units and body controllers. IC Role / Device Role / Timing Role: Discrete diode configured in series with power rail to block reverse current flow during incorrect battery connection. Use Value: Prevents catastrophic damage to downstream PMICs and MCUs; operates reliably at -40 °C to +150 °C ambient with <100 nA leakage ensuring low quiescent current draw. |
Use Scenario: Voltage clamping on CAN FD or LIN bus lines exposed to ESD and load-dump transients. IC Role / Device Role / Timing Role: Fast-switching diode placed between signal line and ground to shunt transient energy before IC input stages. Use Value: 50 ns trr and 2 pF capacitance preserve signal integrity up to 5 Mbps; AEC-Q101 qualification ensures robustness across vehicle life cycle. |
| DC-DC Converter Snubber | Sensor Interface Protection |
|
Use Scenario: Snubbing diode across MOSFET drain-source in 48 V–12 V buck converters used in mild-hybrid power systems. IC Role / Device Role / Timing Role: Freewheeling path for inductive kickback; absorbs energy during switch-off transitions. Use Value: 250 V VRRM withstands reflected spikes from transformer leakage inductance; low trr minimizes switching losses and EMI generation. |
Use Scenario: Overvoltage protection for analog sensor inputs (e.g., pressure, temperature) in HVAC and chassis modules. IC Role / Device Role / Timing Role: Clamp diode connected between sensor output and supply rail to limit excursion beyond safe ADC input range. Use Value: 100 nA IR ensures minimal offset error in µA-level sensor bias networks; small DFN package allows placement within 2 mm of connector entry points. |
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 NSVRBAS21LT3G | VRRM = 250 V, trr = 50 ns, but IR = 200 nA @ 200 V - double the leakage of BAS21LL-Q. | Higher leakage may degrade accuracy in precision sensor clamp circuits at elevated temperatures. | Select when cost sensitivity outweighs leakage-critical performance; verify thermal design margin due to higher Rth(j-a) = 420 K/W. |
| Diodes Inc. BAV21WQ-7-F | VRRM = 250 V, but trr = 75 ns - 50% slower recovery than BAS21LL-Q; Cd = 3 pF. | Slower trr increases switching loss and EMI risk in >500 kHz DC-DC snubbers. | Acceptable only in low-frequency (<200 kHz) clamping; avoid in CAN FD or high-speed power conversion. |
Compared with NSVRBAS21LT3G and BAV21WQ-7-F, the BAS21LL-Q delivers lowest leakage and fastest recovery in its class, making it optimal for thermally constrained, high-reliability automotive signal and power paths where both speed and stability are non-negotiable.
Availability
BAS21LL-Q is available at Aetrix Electronics and suitable for automotive battery protection, high-speed signal clamping, and DC-DC converter snubbing requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for BAS21LL-Q 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 technologies.
The BAS21LL-Q belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for automotive power management, interface protection, and signal conditioning in harsh-environment electronic control units.
FAQ
Is BAS21LL-Q suitable for 48 V automotive systems?
Yes - with 250 V VRRM and AEC-Q101 qualification, the BAS21LL-Q supports 48 V architectures including mild-hybrid power distribution, where it handles load-dump transients (ISO 16750-2) and reverse battery events without degradation. Its 150 °C Tj rating ensures operation in under-hood locations near power converters.
What is the recommended PCB layout for thermal performance?
Use the SOD882 reflow footprint per Figure 10: 0.7 mm × 0.4 mm solder pads with 0.65 mm center-to-center spacing and a 1 cm² copper pour connected to the cathode pad. This achieves Rth(j-sp) = 45 K/W, reducing junction temperature rise by ~30% versus standard FR4 mounting.
Does BAS21LL-Q have a built-in ESD protection structure?
No - the BAS21LL-Q is not an ESD-protected diode. It provides clamping function but requires external TVS or RC filtering for IEC 61000-4-2 Level 4 (±8 kV contact) compliance. Its 2 kV HBM ESD rating (per AEC-Q101) applies only to handling, not system-level surge immunity.
Can BAS21LL-Q replace BAS21 in existing designs?
No - BAS21LL-Q uses DFN1006-2 (SOD882), while BAS21 uses SOD123. The packages are physically incompatible: SOD882 is 60% smaller with different pad geometry and thermal path. Redesign of footprint and thermal validation are required; electrical parameters are similar but not identical (e.g., trr spec tightened to ≤50 ns).
BAS21LL-QYL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOD-882
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 330mA
- 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:
- DFN1006-2
- Operating Temperature - Junction:
- 150°C
BAS21LL-QYL FAQ
1.How can I place an order for BAS21LL-QYL through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21LL-QYL 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 BAS21LL-QYL reliable?
The price and inventory of BAS21LL-QYL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21LL-QYL is usually 5 days.
3.What payment methods are accepted for BAS21LL-QYL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21LL-QYL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21LL-QYL?
BAS21LL-QYL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21LL-QYL 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 BAS21LL-QYL?
For technical support, including BAS21LL-QYL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21LL-QYL requirements.
6.How does Aetrix verify that BAS21LL-QYL is sourced from the original manufacturer or authorized distributors?
All BAS21LL-QYL 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 BAS21LL-QYL meets industry standards.
7.What is the process for return or replacement of BAS21LL-QYL?
All BAS21LL-QYL units undergo pre-shipment inspection (PSI). If there is an issue with BAS21LL-QYL, 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 BAS21LL-QYL part is unused and in its original packaging.
Return procedure for BAS21LL-QYL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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