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Nexperia USA Inc. BAS21QA-QZ
- Part No.:
- BAS21QA-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BAS21QA-QZ.pdf
- Description:
- BAS21QA-Q/SOT1215/DFN1010D-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,104
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Product details
Overview
BAS21QA-QZ from Nexperia is a high-voltage switching diode in a DFN1010D-3 (SOT1215) ultra-small leadless package, rated for 200 V reverse voltage, 330 mA forward current, and 50 ns reverse recovery time. It serves as a fast-switching, low-leakage rectifier or clamping element in space-constrained automotive and industrial power rails.
For engineers reviewing the BAS21QA-QZ datasheet, BAS21QA-QZ pinout, BAS21QA-QZ application, or BAS21QA-QZ equivalent, key selection criteria include AEC-Q101 qualification, 2 pF junction capacitance, 0.37 mm package height, and dual cathode terminals enabling robust thermal and current handling in compact DC/DC and protection circuits.
Technical Context
The BAS21QA-QZ is a silicon planar epitaxial high-voltage switching diode optimized for fast transient response and low leakage under high reverse bias. Its structure supports repetitive peak reverse voltage up to 250 V and operates reliably from −55 °C to +150 °C junction temperature.
Thermal performance is enhanced by dual cathode terminals (Pins 3 and 4), reducing Rth(j-sp) to 45 K/W at the solder point. The device uses a standard FR4 PCB footprint with 0.75 mm pitch and is qualified per AEC-Q101 for automotive-grade reliability without derating at 85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VRRM) | 250 V peak - enables use in 120/230 VAC-derived DC rails with margin against transients |
| Forward Current (IF) | 330 mA continuous - supports moderate-power signal-level switching without heatsinking |
| Reverse Recovery Time (trr) | 50 ns - ensures minimal switching loss in PWM frequencies up to ~2 MHz |
| Junction Capacitance (Cd) | 2 pF at 0 V - preserves signal integrity in RF-coupled or high-frequency timing paths |
| Reverse Leakage (IR) | 100 nA at 200 V, 25 °C - maintains low standby power in battery-backed or always-on circuits |
| Package Height | 0.37 mm - fits beneath 0.4 mm board-to-board connectors and in ultra-thin modules |
| AEC-Q101 Qualified | Yes - validated for automotive powertrain, body control, and ADAS subsystems |
Pinout & Package
DFN1010D-3 (SOT1215) is a 4-terminal, leadless, thermally enhanced ultra-thin plastic package measuring 1.1 mm × 1.0 mm × 0.37 mm, with visible side pads for AOI-compatible solder joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Main P-side connection; carries full forward current path into the die |
| 2 | Not Connected | Electrically isolated; no internal bond wire or die attachment - must be left floating |
| 3 | Cathode | Primary N-side terminal; used for thermal conduction and current return |
| 4 | Cathode | Secondary N-side terminal; parallel cathode path improves current sharing and reduces effective Rth(j-sp) |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | 50 ns trr enables clean edge transitions in 1–2 MHz DC/DC controllers and snubbers |
| Ultra-low leakage | 100 nA IR at 200 V ensures stable bias networks in precision analog front-ends |
| Dual cathode terminals | Reduces thermal resistance to 45 K/W at solder point - critical for sustained 330 mA operation on FR4 |
| AEC-Q101 qualification | Validated for automotive temperature cycling, HTRB, and ESD - eliminates requalification effort |
| AOI-compatible packaging | Side-wettable flanks allow automated optical inspection of solder fillets without X-ray |
Applications
| Automotive Body Control Module | Industrial DC/DC Converter Snubber |
|---|---|
Use Scenario: Reverse polarity protection and load dump clamping in 12 V vehicle electronics. IC Role / Device Role / Timing Role: High-voltage clamping diode placed across input rail to absorb ISO 7637-2 pulse 5a/b surges. Use Value: Withstands 250 V repetitive peak reverse voltage and dissipates surge energy via low trr-driven minimal overshoot. |
Use Scenario: RC snubber network across MOSFET drain-source in flyback converters operating at 500 kHz. IC Role / Device Role / Timing Role: Fast-recovery clamp diode limiting voltage spikes during MOSFET turn-off. Use Value: 2 pF capacitance minimizes snubber loading; 50 ns trr prevents reverse conduction during dead-time. |
| Portable Medical Sensor Power Rail | Smart Meter Reverse Voltage Protection |
Use Scenario: Input rectification and polarity safeguard for Li-ion–charged sensor nodes with tight height constraints. IC Role / Device Role / Timing Role: Low-profile, high-reliability switching diode in battery charging path. Use Value: 0.37 mm height fits under stacked PCB assemblies; 100 nA leakage preserves multi-year battery life. |
Use Scenario: Polarity guard on AC/DC adapter input of utility meters exposed to field wiring errors. IC Role / Device Role / Timing Role: Series-connected protection diode blocking reverse input connection. Use Value: AEC-Q101 qualification ensures long-term stability under 85 °C ambient and humidity cycling. |
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 NSR20F20HT1G | 200 V VRRM, 200 mA IF, 35 ns trr, SOD-923 package (0.6 mm × 0.3 mm) | Lower current rating and smaller footprint; lacks AEC-Q101 qualification | Select when board space is tighter than 1.0 mm × 1.1 mm and automotive qualification is not required. |
| Vishay VS-2EDH02HM3/85A | 200 V VRRM, 350 mA IF, 75 ns trr, SOD-123FL package (1.7 mm × 1.3 mm) | Larger footprint and slower recovery; qualified to AEC-Q101 but higher profile (0.9 mm) | Choose when higher surge current capability (1.7 A IFSM) is prioritized over height and speed. |
Compared with NSR20F20HT1G and VS-2EDH02HM3/85A, the BAS21QA-QZ uniquely balances 250 V VRRM, 50 ns trr, AEC-Q101 compliance, and 0.37 mm height - making it optimal for automotive and portable systems where vertical clearance, reliability, and transient response are jointly constrained.
Availability
BAS21QA-QZ is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC/DC converter snubbers, and portable medical sensor power rails requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BAS21QA-QZ 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 essential semiconductors - including logic, discrete, and MOSFET devices - with leadership in automotive and industrial applications.
The BAS21QA-QZ belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for robust clamping, reverse polarity protection, and fast switching in space- and thermal-constrained automotive and industrial power systems.
FAQ
Is BAS21QA-QZ pin-compatible with BAS21DW-Q?
No. BAS21QA-QZ uses a 4-pin DFN1010D-3 (SOT1215) package with Pins 1=A, 2=NC, 3=K, 4=K, while BAS21DW-Q is a 3-pin SOT323 package with different pin assignment and thermal design. Layout redesign and solder mask adjustment are required for substitution.
What is the maximum allowable PCB copper area for cathode thermal relief?
The datasheet specifies two mounting conditions: standard FR4 footprint (350 mW Ptot) and 1 cm² cathode pad (610 mW Ptot). For full 610 mW dissipation, a minimum 10 mm × 10 mm copper pour connected directly to Pins 3 and 4 is required, with no thermal relief spokes.
Does BAS21QA-QZ support wave soldering?
No. The DFN1010D-3 package is designed exclusively for reflow soldering. Wave soldering risks solder bridging between side pads and insufficient wetting due to the ultra-low profile and lack of through-hole leads. Reflow profiles must follow Nexperia's SOT1215 guidelines.
How does the dual-cathode configuration affect PCB layout?
Pins 3 and 4 must be routed to the same net and connected to a common thermal pad. Splitting them or routing separately increases thermal resistance and may cause current imbalance. The recommended footprint uses a single 0.45 mm × 0.35 mm solder land for each cathode terminal, joined by a solid copper pour.
BAS21QA-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):
- 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:
- DFN1010D-3
- Operating Temperature - Junction:
- 150°C
BAS21QA-QZ FAQ
1.How can I place an order for BAS21QA-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21QA-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 BAS21QA-QZ reliable?
The price and inventory of BAS21QA-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21QA-QZ is usually 5 days.
3.What payment methods are accepted for BAS21QA-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21QA-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21QA-QZ?
BAS21QA-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21QA-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 BAS21QA-QZ?
For technical support, including BAS21QA-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21QA-QZ requirements.
6.How does Aetrix verify that BAS21QA-QZ is sourced from the original manufacturer or authorized distributors?
All BAS21QA-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 BAS21QA-QZ meets industry standards.
7.What is the process for return or replacement of BAS21QA-QZ?
All BAS21QA-QZ units undergo pre-shipment inspection (PSI). If there is an issue with BAS21QA-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 BAS21QA-QZ part is unused and in its original packaging.
Return procedure for BAS21QA-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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