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Nexperia USA Inc. BAS21QCZ
- Part No.:
- BAS21QCZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BAS21QCZ.pdf
- Description:
- DIODE GP 200V 250MA DFN1412D-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,346
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Product details
Overview
BAS21QCZ from Nexperia is a high-voltage switching diode in a DFN1412D-3 (SOT8009) leadless SMD package, rated for 250 V repetitive peak 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 management and industrial DC-DC converter front-ends.
For engineers reviewing the BAS21QCZ datasheet, BAS21QCZ pinout, BAS21QCZ application, or BAS21QCZ equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, side-wettable flank packaging details, thermal resistance data, and real-world switching use cases - all critical for high-reliability board-level design and AOI-compatible layout.
Technical Context
The BAS21QCZ is a silicon planar epitaxial switching diode optimized for high-speed turn-off with controlled minority-carrier lifetime. Its trr ≤ 50 ns is achieved under defined test conditions (IF = IR = 30 mA, RL = 100 Ω, IR(meas) = 3 mA), enabling clean commutation in flyback snubbers and active clamp circuits.
It operates across –55 °C to +150 °C junction temperature, supports 200 V DC reverse blocking, and exhibits only 100 nA leakage at VR = 200 V and Tj = 25 °C - making it suitable for precision voltage clamping where leakage-induced offset must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 250 V - Maximum repetitive peak reverse voltage; defines safe DC/AC blocking capability in transient suppression and clamp networks. |
| IF | 250 mA - Continuous forward current rating on FR4 PCB with standard footprint; sets maximum steady-state conduction capacity. |
| trr | 50 ns - Reverse recovery time under specified test conditions; determines minimum switching frequency limit and switching loss in hard-switched topologies. |
| IR @ VR=200 V | 100 nA - Reverse leakage at rated voltage and 25 °C; ensures minimal standby power loss in high-impedance bias or sensing paths. |
| Cd @ VR=0 V | 5 pF - Junction capacitance at zero bias and 1 MHz; impacts high-frequency signal integrity and EMI filter response in RF-coupled circuits. |
| Rth(j-a) | 285 K/W - Junction-to-ambient thermal resistance on standard FR4; informs derating curves and heatsinking requirements for sustained operation. |
| AEC-Q101 | Qualified - Certified for automotive discrete semiconductor stress testing; validates reliability for under-hood and ADAS power subsystems. |
Pinout & Package
DFN1412D-3 (SOT8009) is an ultra-thin, leadless plastic package measuring 1.4 mm × 1.2 mm × 0.48 mm with side-wettable flanks for automated optical inspection of solder joints. Its 0.8 mm pitch and 0.5 mm max height support high-density routing and low-profile assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward current entry point; connects to positive rail or switch node in clamping configurations. |
| 2 | Not Connected | Internally isolated terminal; no electrical function - must remain unconnected in PCB layout. |
| 3 | Cathode | Forward current exit and reverse voltage reference; ties to ground or return path in polarity protection schemes. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | trr ≤ 50 ns enables operation up to ~2 MHz in non-resonant converters without excessive switching loss. |
| Low leakage current | IR ≤ 100 nA at 200 V ensures <1 µW standby dissipation in battery-backed or energy-harvesting systems. |
| Side-wettable flanks | Protrusion ≤ 0.02 mm allows reliable AOI detection of solder joint quality on bottom-side terminals. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTGB, HTRB, and temperature cycling per AEC standard. |
| Ultra-low profile | 0.48 mm body height supports mechanical clearance in stacked modules and space-constrained infotainment PCBs. |
Applications
| Automotive Power Clamping | Industrial DC-DC Input Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V vehicle power rails. IC Role / Device Role / Timing Role: Fast-clamping diode placed between battery input and downstream regulator ICs. Use Value: 250 V VRRM withstands 120 V spikes; 50 ns trr limits energy dissipation during sub-microsecond surges. |
Use Scenario: Reverse polarity protection at the input stage of 24 V industrial PLC power supplies. IC Role / Device Role / Timing Role: Series-connected cathode-to-load diode preventing damage during incorrect connector mating. Use Value: 100 nA IR minimizes quiescent current draw; AEC-Q101 qualification ensures field longevity in harsh environments. |
| High-Speed Signal Demodulation | LED Driver Flyback Snubber |
|
Use Scenario: Envelope detection in 1–10 MHz RF receiver front-ends for wireless sensor nodes. IC Role / Device Role / Timing Role: Low-capacitance (5 pF) switching diode rectifying AM-modulated carrier signals. Use Value: Minimal Cd preserves signal bandwidth; low VF (1.25 V @ 200 mA) maintains detection sensitivity. |
Use Scenario: Clamp diode across primary-side MOSFET in isolated flyback LED drivers for street lighting. IC Role / Device Role / Timing Role: Absorbs leakage inductance energy during MOSFET turn-off to limit voltage overshoot. Use Value: 50 ns trr ensures full energy transfer before next switching cycle; 250 mA IF handles peak clamp currents. |
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 NSVBAV21HT1G | Same VRRM (250 V), but trr = 60 ns and IR = 500 nA @ 200 V - higher leakage and slower recovery. | Less suitable for low-leakage clamping; acceptable in cost-sensitive non-automotive designs. | Select when AEC-Q101 is not required and 10 ns trr margin is acceptable. |
| Diodes Incorporated BAV21W-7-F | SO-363 package (larger, 2.2 mm × 1.35 mm); same VRRM and trr, but Rth(j-a) = 320 K/W - worse thermal performance. | Requires more PCB area and offers lower power density; unsuitable for AOI-dependent production lines. | Choose only if legacy SO-363 footprint compatibility is mandatory and thermal headroom exists. |
Compared with NSVBAV21HT1G and BAV21W-7-F, the BAS21QCZ delivers superior leakage control, faster switching, better thermal resistance, and AEC-Q101 validation - making it the preferred choice for automotive and high-density industrial power stages where reliability and miniaturization are co-prioritized.
Availability
BAS21QCZ is available at Aetrix Electronics and suitable for automotive power clamping, industrial DC-DC input protection, and LED driver flyback snubbing requiring stable component supply, consistent AEC-Q101 compliance, and DFN1412D-3 packaging for AOI-enabled manufacturing.
Supply support for BAS21QCZ 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 - delivering discrete, logic, and MOSFET solutions for automotive, industrial, and mobile markets.
The BAS21QCZ belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for robust transient suppression and polarity protection in automotive power distribution and industrial power conversion systems.
FAQ
What is the maximum junction temperature for continuous operation of the BAS21QCZ?
The absolute maximum junction temperature is 150 °C, and the device is rated for continuous operation up to this limit when thermal design respects the specified Rth(j-a) = 285 K/W on standard FR4. Derating is required above Tamb = 25 °C, with full current capability maintained only below 75 °C ambient under typical PCB conditions.
Is the NC pin (Pin 2) electrically isolated or internally tied to another node?
Pin 2 is explicitly designated "not connected" in the official Nexperia datasheet and is fully electrically isolated - no internal bond wire or die connection exists. It must remain unconnected on the PCB; routing traces or thermal pads to this terminal may cause unintended coupling or solder bridging.
How does the side-wettable flank feature improve manufacturing yield?
The side-wettable flank (SWF) provides a visible solder meniscus along the vertical edge of the DFN1412D-3 package, enabling automated optical inspection systems to verify solder joint formation, wetting quality, and coplanarity - reducing false negatives in reflow defect detection and improving first-pass yield in high-volume automotive PCB assembly.
Can the BAS21QCZ replace the older BAS21 in existing designs?
No - the BAS21QCZ uses a DFN1412D-3 (SOT8009) package with side-wettable flanks and a 3-terminal configuration (including NC), whereas the legacy BAS21 is in SOT23 with 3 functional pins and no NC. Footprint, thermal behavior, and solder process requirements differ significantly; redesign and requalification are required.
BAS21QCZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 3-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- DFN1412D-3
- Operating Temperature - Junction:
- 150°C
BAS21QCZ FAQ
1.How can I place an order for BAS21QCZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21QCZ 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 BAS21QCZ reliable?
The price and inventory of BAS21QCZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21QCZ is usually 5 days.
3.What payment methods are accepted for BAS21QCZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21QCZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21QCZ?
BAS21QCZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21QCZ 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 BAS21QCZ?
For technical support, including BAS21QCZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21QCZ requirements.
6.How does Aetrix verify that BAS21QCZ is sourced from the original manufacturer or authorized distributors?
All BAS21QCZ 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 BAS21QCZ meets industry standards.
7.What is the process for return or replacement of BAS21QCZ?
All BAS21QCZ units undergo pre-shipment inspection (PSI). If there is an issue with BAS21QCZ, 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 BAS21QCZ part is unused and in its original packaging.
Return procedure for BAS21QCZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS21QCZ Tags
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