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Nexperia USA Inc. BAS21QB-QZ
- Part No.:
- BAS21QB-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BAS21QB-QZ.pdf
- Description:
- DIODE GP 200V 250MA DFN1110D-3
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
BAS21QB-Q from Nexperia is a high-voltage switching diode in a DFN1110D-3 (SOT8015) leadless SMD package, rated for 200 V reverse voltage, 250 mA forward current, and 50 ns reverse recovery time. It serves as a fast, low-leakage clamping and polarity protection device in automotive power rails and DC-DC converter feedback paths.
For engineers reviewing the BAS21QB-Q datasheet, BAS21QB-Q pinout, BAS21QB-Q application, or BAS21QB-Q equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, side-wettable flank package details, thermal resistance values, and automotive-grade reliability context - all critical for high-reliability board-level design and AOI-compatible layout.
Technical Context
This diode employs a planar silicon epitaxial structure optimized for high-speed switching with minimal minority-carrier storage. Its 50 ns trr and 5 pF capacitance support operation in 1–10 MHz switching converters and transient voltage suppression circuits where fast turn-off and low capacitive loading are essential.
The device is characterized across −40 °C to +150 °C junction temperature, with leakage current tightly controlled at ≤100 nA @ 200 V/25 °C and ≤100 µA @ 200 V/150 °C. Thermal resistance from junction-to-ambient is 295 K/W on standard FR4 and improves to 165 K/W with enhanced cathode pad area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 200 V - supports input rail clamping in 12 V/24 V automotive systems without breakdown |
| Forward Current (IF) | 250 mA - sufficient for signal-level switching and auxiliary bias path control |
| Reverse Recovery Time (trr) | 50 ns - enables clean commutation in PWM frequencies up to ~2 MHz |
| Diode Capacitance (Cd) | 5 pF @ 0 V, 1 MHz - minimizes high-frequency coupling in RF-adjacent signal paths |
| Forward Voltage (VF) | 1.25 V @ 200 mA, 25 °C - low conduction loss for efficiency-critical clamp functions |
| Reverse Leakage (IR) | 100 nA @ 200 V, 25 °C - ensures stable DC bias integrity in high-impedance nodes |
| Junction Temperature (Tj) | 150 °C max - validated for under-hood automotive environments per AEC-Q101 |
Pinout & Package
Encapsulated in the DFN1110D-3 (SOT8015) ultra-thin leadless package: 1.1 mm × 1.0 mm × 0.48 mm body, 0.65 mm pitch, side-wettable flanks for automated optical inspection (AOI) of solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to higher-potential node in clamping or rectification |
| 2 | Not Connected (n.c.) | Internally isolated terminal; must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode (K) | Forward current exit and reverse-blocking terminal; ties to reference or ground plane |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Stress-tested for automotive use including temperature cycling, HTRB, and ESD per JEDEC JESD22 standards |
| Side-wettable flanks | Enables reliable AOI detection of solder joint quality on bottom-side terminals |
| Ultra-low profile (0.48 mm) | Reduces board stack height in space-constrained modules such as ADAS sensor housings |
| Low thermal resistance (165 K/W) | Supports sustained 250 mA operation with minimal derating when using 1 cm² cathode copper |
| 100 nA IR @ 25 °C | Maintains signal integrity in high-impedance voltage monitor or level-shift circuits |
Applications
| Automotive Power Rail Clamping | DC-DC Converter Feedback Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Fast-switching clamp diode placed between supply rail and ground to shunt >200 V spikes. Use Value: 200 V VR rating and 50 ns trr ensure clamping activation before downstream IC damage occurs. |
Use Scenario: Protecting optocoupler feedback inputs in isolated flyback converters. IC Role / Device Role / Timing Role: Reverse-polarity blocking element in feedback path to prevent latch-up during startup. Use Value: 100 nA IR prevents DC error injection into high-gain error amplifier inputs. |
| Reverse Polarity Input Protection | High-Speed Signal Switching |
|
Use Scenario: Preventing damage from incorrect battery connection in telematics modules. IC Role / Device Role / Timing Role: Series anode-cathode path in main power input to block reverse current flow. Use Value: Low VF (1.25 V) limits insertion loss and self-heating during normal forward operation. |
Use Scenario: Enabling/disabling analog sensor signals in multiplexed data acquisition systems. IC Role / Device Role / Timing Role: Passive switch in signal path with minimal capacitive loading and fast turn-on/off. Use Value: 5 pF Cd avoids bandwidth degradation in 10 MHz sensor output signals. |
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 |
|---|---|---|---|
| BAS21J-Q | Same die, but in SOD-323 package (2.7 mm × 1.7 mm); no side-wettable flanks | Lacks AOI compatibility and has higher Rth(j-a) (350 K/W); unsuitable for dense automotive PCBs | Select only if legacy footprint reuse or hand-soldering is required |
| 1N4148W-Q | Lower VR (100 V), higher trr (4 ns typical but not guaranteed ≤50 ns), same AEC-Q101 grade | Not rated for 200 V clamping; limited to 5 V–12 V logic-level switching | Choose only for non-clamping, low-voltage signal routing where size is secondary |
Compared with BAS21QB-Q, BAS21J-Q trades AOI capability and thermal performance for backward-compatible packaging, while 1N4148W-Q sacrifices reverse voltage headroom for marginally faster nominal switching - making BAS21QB-Q the sole option meeting 200 V clamping, 50 ns trr, and AEC-Q101-compliant AOI requirements simultaneously.
Availability
BAS21QB-Q is available at Aetrix Electronics and suitable for automotive ECU power management, industrial DC-DC converter protection, and high-reliability reverse polarity safeguarding requiring stable component supply across multi-year production cycles.
Supply support for BAS21QB-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.
BAS21QB-Q belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for robust transient suppression and polarity protection in harsh automotive environments.
FAQ
Is BAS21QB-Q pin-compatible with BAS21J-Q?
No. BAS21QB-Q uses a 3-terminal DFN1110D-3 (SOT8015) package with pin 2 internally unconnected, while BAS21J-Q is in a 2-terminal SOD-323 package. The footprint, soldering method, and thermal pad configuration differ fundamentally - direct replacement requires PCB redesign.
What is the maximum allowable peak forward surge current for BAS21QB-Q?
The non-repetitive peak forward current (IFSM) is 1.7 A for a 10 ms square wave pulse at Tj(init) = 25 °C. This value is defined under IEC 60134 limiting conditions and applies only to single-event transient overload scenarios, not continuous operation.
Does BAS21QB-Q require special reflow profile considerations due to its side-wettable flanks?
Yes. The DFN1110D-3 package requires precise stencil design (0.1 mm thickness recommended) and controlled reflow ramp rates to ensure uniform wetting of side flanks. Figure 9 in the datasheet specifies the exact solder land geometry and paste volume to achieve AOI-acceptable fillets without bridging.
Can BAS21QB-Q be used in place of a Zener diode for voltage clamping?
No. BAS21QB-Q is a switching diode, not a Zener. It lacks controlled reverse breakdown characteristics and will not regulate voltage above VR. For clamping, it relies on external circuitry (e.g., series resistor + ground return) to limit current during transient events - unlike Zeners, which conduct steadily at specified VZ.
BAS21QB-QZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 3-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 250mA
- 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:
- 5pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- DFN1110D-3
- Operating Temperature - Junction:
- 150°C
BAS21QB-QZ FAQ
1.How can I place an order for BAS21QB-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21QB-QZ 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 BAS21QB-QZ reliable?
The price and inventory of BAS21QB-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21QB-QZ is usually 5 days.
3.What payment methods are accepted for BAS21QB-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21QB-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21QB-QZ?
BAS21QB-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21QB-QZ 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 BAS21QB-QZ?
For technical support, including BAS21QB-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21QB-QZ requirements.
6.How does Aetrix verify that BAS21QB-QZ is sourced from the original manufacturer or authorized distributors?
All BAS21QB-QZ 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 BAS21QB-QZ meets industry standards.
7.What is the process for return or replacement of BAS21QB-QZ?
All BAS21QB-QZ units undergo pre-shipment inspection (PSI). If there is an issue with BAS21QB-QZ, 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 BAS21QB-QZ part is unused and in its original packaging.
Return procedure for BAS21QB-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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