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Nexperia USA Inc. BAS321-QZ
- Part No.:
- BAS321-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BAS321-QZ.pdf
- Description:
- BAS321-Q/SOD323/SOD2
- Quantity:
- Payment:
- Shipping:
Inventory:5,282
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Product details
Overview
BAS321-QZ from Nexperia is a general-purpose silicon switching diode fabricated in planar technology, housed in an SOD323 (SC-76) surface-mount package. It delivers 250 mA continuous forward current, 200 V reverse voltage rating, 1.25 V forward voltage at 200 mA, 50 ns reverse recovery time, and is AEC-Q101 qualified for automotive use.
For engineers reviewing the BAS321-QZ datasheet, BAS321-QZ pinout, BAS321-QZ application, or BAS321-QZ equivalent, key selection criteria include its 50 ns switching speed, 200 V VR rating, thermal resistance of 366 K/W (junction-to-ambient), SOD323 footprint compatibility, and AEC-Q101 qualification status for under-hood electronics.
Technical Context
The BAS321-QZ operates as a unidirectional current switch with low forward voltage drop and fast turn-off behavior enabled by optimized carrier lifetime control. Its planar construction ensures stable junction characteristics across temperature, supporting reliable operation up to 150 °C junction temperature.
Designed for high-reliability surface-mounted circuits, it sustains repetitive peak forward currents up to 625 mA and non-repetitive surges up to 14.1 A (50 µs), while maintaining reverse leakage below 100 nA at 200 V and 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Voltage (VF) | 1.25 V at IF = 200 mA, Tj = 25 °C - defines conduction loss in power path |
| Reverse Recovery Time (trr) | 50 ns - enables efficient switching in 1–5 MHz signal routing and clamp circuits |
| Repetitive Peak Reverse Voltage (VRRM) | 250 V - supports transient suppression in 24 V automotive systems |
| Continuous Forward Current (IF) | 250 mA - suitable for logic-level signal steering and low-power supply rail clamping |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 366 K/W on FR4 PCB - limits power dissipation to ≤300 mW at 25 °C ambient |
| Reverse Leakage Current (IR) | 100 nA at VR = 200 V, Tj = 25 °C - ensures minimal standby power loss in bias networks |
| Diode Capacitance (Cd) | 2 pF at VR = 0 V, f = 1 MHz - preserves signal integrity in RF-coupled detection paths |
Pinout & Package
Package: SOD323 (SC-76), plastic surface-mount package measuring 1.7 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch and tin-plated terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal; connects to lower-potential node in forward-biased configuration |
| 2 | Anode (A) | Positive terminal; accepts input current during forward conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| SOD323 footprint | Enables high-density PCB layouts with standardized reflow-compatible solder land pattern |
| 50 ns trr | Supports clean edge transitions in digital signal clamping and pulse shaping applications |
| 150 °C maximum junction temperature | Permits operation in engine-control modules and under-dash infotainment without derating |
| 2 pF capacitance | Minimizes loading effects in high-frequency detector and sampling circuits |
Applications
| Automotive Door Module | USB Port Protection |
|---|---|
Use Scenario: Reverse polarity protection and ESD clamping on LIN bus lines and window motor drivers. IC Role / Device Role / Timing Role: General-purpose switching diode providing bidirectional transient suppression and DC blocking. Use Value: Prevents latch-up in microcontroller I/O pins during battery disconnect events while maintaining <50 ns response to 1 kV ESD pulses. |
Use Scenario: Signal line clamping and overvoltage isolation between USB 2.0 data pairs and host controller. IC Role / Device Role / Timing Role: Low-capacitance (2 pF) switching diode used in TVS-assisted clamping networks. Use Value: Limits signal distortion on D+ and D− lines while sustaining 200 V reverse standoff during hot-plug transients. |
| Industrial Sensor Interface | Power Supply Sequencing |
Use Scenario: Level-shifting and fault isolation between 3.3 V sensor outputs and 5 V ADC inputs in PLC analog modules. IC Role / Device Role / Timing Role: Unidirectional current gate enabling controlled signal transfer with minimal forward drop. Use Value: Delivers 1.25 V VF at 200 mA to reduce offset error in precision ratiometric measurements. |
Use Scenario: OR-ing diode in dual-rail 12 V/5 V power supplies for FPGA-based edge controllers. IC Role / Device Role / Timing Role: Low-loss forward conduction path with fast reverse recovery to prevent cross-conduction. Use Value: Enables seamless rail switchover with <50 ns dead-time control, minimizing brown-out risk during supply transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar general-purpose switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSVRBAS321WT1G | Same SOD323 package, identical 200 V VR and 50 ns trr, but rated only to 125 °C junction temperature | Lacks AEC-Q101 qualification; not approved for automotive under-hood use | Select when operating ambient stays below 85 °C and automotive qualification is unnecessary |
| Vishay VS-3BQ01500-M3/84 | Higher 300 V VRRM and 1.5 A IFRM, but larger SOD-123 package and 75 ns trr | Better surge handling but slower switching and incompatible footprint | Choose for industrial power rails requiring higher transient margin and less critical timing |
Compared with NSVRBAS321WT1G and VS-3BQ01500-M3/84, the BAS321-QZ uniquely combines AEC-Q101 qualification, 50 ns trr, and SOD323 size-making it optimal for space-constrained automotive signal conditioning where thermal and timing margins are tight.
Availability
BAS321-QZ is available at Aetrix Electronics and suitable for automotive door modules, USB port protection circuits, industrial sensor interfaces, and power supply sequencing networks requiring stable component supply and long-term lifecycle assurance.
Supply support for BAS321-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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The BAS321-QZ belongs to Nexperia's AEC-Q101-qualified general-purpose diode product line, engineered specifically for robust signal switching and transient protection in automotive and industrial surface-mount applications.
FAQ
What is the maximum continuous forward current for BAS321-QZ at 70 °C ambient?
At 70 °C ambient temperature on an FR4 PCB, the maximum permissible continuous forward current is approximately 180 mA, derived from the derating curve in Figure 1 of the datasheet, which shows linear reduction from 250 mA at 25 °C to zero at ~125 °C.
Is BAS321-QZ suitable for high-frequency rectification above 10 MHz?
No - while its 50 ns trr supports switching up to ~5 MHz, parasitic capacitance (2 pF) and minority-carrier storage effects limit effective operation beyond that range; Schottky diodes like PMEG3010CEH are preferred for >10 MHz rectification.
Does BAS321-QZ have a specified avalanche energy rating?
No - the datasheet does not specify single-pulse avalanche energy (EAS) or repetitive avalanche ratings; it is not designed or characterized for avalanche-mode operation, and operation beyond VRRM may cause irreversible junction damage.
How does the marking code 'A7' correspond to BAS321-QZ?
The marking code 'A7' is the top-side laser-marked identifier for BAS321-QZ per Table 4 of the datasheet; it appears on the cathode end of the SOD323 body and is used for traceability and visual part verification during assembly and inspection.
BAS321-QZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- 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:
- 2pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- 150°C
BAS321-QZ FAQ
1.How can I place an order for BAS321-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS321-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 BAS321-QZ reliable?
The price and inventory of BAS321-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS321-QZ is usually 5 days.
3.What payment methods are accepted for BAS321-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS321-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS321-QZ?
BAS321-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS321-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 BAS321-QZ?
For technical support, including BAS321-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS321-QZ requirements.
6.How does Aetrix verify that BAS321-QZ is sourced from the original manufacturer or authorized distributors?
All BAS321-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 BAS321-QZ meets industry standards.
7.What is the process for return or replacement of BAS321-QZ?
All BAS321-QZ units undergo pre-shipment inspection (PSI). If there is an issue with BAS321-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 BAS321-QZ part is unused and in its original packaging.
Return procedure for BAS321-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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