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Nexperia USA Inc. BAS321J-QX
- Part No.:
- BAS321J-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
BAS321J-QX.pdf
- Description:
- BAS321J-Q/SOD323F/SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:5,852
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Product details
Overview
BAS321J-Q from Nexperia is a high-voltage switching diode in SOD323F (SC-90) 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 management and signal routing circuits.
For engineers reviewing the BAS321J-Q datasheet, BAS321J-Q pinout, BAS321J-Q application, or BAS321J-Q equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance values, real-world switching performance at 30 mA/30 mA test conditions, and validated automotive-grade reliability data - all critical for high-reliability board-level design and BOM validation.
Technical Context
This diode employs a planar epitaxial silicon structure optimized for high-speed minority-carrier switching with controlled carrier lifetime. Its 50 ns trr and ≤2 pF capacitance enable clean edge transitions in 1–10 MHz digital and analog signal paths.
The device operates across −55 °C to +150 °C junction temperature, supported by 190 K/W junction-to-solder-point thermal resistance and AEC-Q101 qualification - confirming robustness under automotive thermal cycling and transient surge stress per IEC60134 limiting values.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 200 V - supports 24 V and 48 V automotive bus clamping without breakdown |
| VRRM (Peak Reverse Voltage) | 250 V - withstands repetitive transients up to ISO 7637-2 Pulse 1/2a levels |
| trr (Reverse Recovery Time) | 50 ns - enables reliable operation in 10 MHz+ switching nodes with minimal switching loss |
| IR (Reverse Leakage) | 100 nA @ 200 V, 25 °C - ensures negligible standby current in battery-sensitive systems |
| Cd (Diode Capacitance) | 2 pF @ 0 V, 1 MHz - preserves signal integrity in high-frequency data line protection |
| IF (Forward Current) | 250 mA continuous - sufficient for LED biasing, logic-level translation, and sensor interface loads |
| Rth(j-sp) | 190 K/W - enables thermal coupling to PCB copper for effective heat dissipation in compact layouts |
Pinout & Package
SOD323F (SC-90) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.7 mm body, flat leads, cathode-marked top-side marking "ED", FR4-compatible footprint per Figure 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to higher-potential node during reverse bias; primary thermal path to PCB via solder pad |
| 2 | Anode (A) | Current entry point during forward conduction; routed to lower-potential rail or signal return |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements |
| trr ≤ 50 ns | Enables use in flyback snubbers and high-frequency DC-DC feedback paths without oscillation risk |
| IR ≤ 100 nA @ 200 V | Minimizes quiescent drain in always-on vehicle modules (e.g., CAN wake-up receivers) |
| Cd ≤ 2 pF | Preserves rise/fall times in USB 2.0, LIN, and SENT signal line protection |
| VF = 1.25 V @ 200 mA | Reduces forward drop versus Schottky alternatives while maintaining high VR rating |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load-dump transients on 12 V microcontroller supply rails in engine control units. IC Role / Device Role / Timing Role: Fast-acting clamp diode placed between VCC and ground, triggered within nanoseconds of overvoltage onset. Use Value: Limits rail excursion to ≤250 V using VRRM margin, with <50 ns response preventing MCU brownout or latch-up. |
Use Scenario: Protecting analog output pins of pressure sensors against reverse wiring or ESD events. IC Role / Device Role / Timing Role: Bidirectional clamping element shunting fault current away from precision amplifier inputs. Use Value: 2 pF capacitance avoids signal distortion at 10 kHz sensor bandwidth; 100 nA leakage preserves µV-level offset accuracy. |
| USB 2.0 Data Line Polarity Guard | Smart Lighting LED String Reverse Blocking |
Use Scenario: Preventing damage when USB Type-A cables are inserted incorrectly into host-side receptacles. IC Role / Device Role / Timing Role: Series-connected anode-to-cathode blocking diode on D+ and D− lines. Use Value: 1.25 V VF at 200 mA ensures <1% signal attenuation at 480 Mbps; 2 pF Cd avoids eye diagram closure. |
Use Scenario: Isolating individual LED strings in multi-zone automotive lighting to prevent backfeed during partial failure. IC Role / Device Role / Timing Role: High-VR blocking diode in series with each string's return path. Use Value: 200 V VR rating exceeds worst-case string open-circuit voltage; 250 mA IF handles peak PWM currents without derating. |
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 NSVBAS321LT1G | Same SOD-323F package, identical 200 V VR and 50 ns trr, but rated only to 125 °C Tj (vs. 150 °C) | Limited to under-hood ambient ≤105 °C; not AEC-Q101 qualified | Select when cost sensitivity outweighs extended temperature or automotive compliance needs |
| Diodes Incorporated BAV99WQ-7-F | Dual diode in SOT-363; 70 V VR per diode, 4 ns trr, 10 pF Cd - faster but lower voltage rating | Suitable for low-voltage logic-level clamping (e.g., 3.3 V I/O), not 12/24 V rail protection | Choose only for sub-70 V signal integrity applications where speed > voltage headroom |
Compared with NSVBAS321LT1G and BAV99WQ-7-F, BAS321J-Q uniquely combines AEC-Q101 qualification, 150 °C junction rating, and 200 V/50 ns performance in a single-diode SC-90 package - making it the sole option for thermally demanding automotive clamping where single-device simplicity and full-spec compliance are mandatory.
Availability
BAS321J-Q is available at Aetrix Electronics and suitable for automotive ECU power rail clamping, industrial sensor signal line protection, and USB 2.0 data line polarity guard applications requiring stable component supply and long-term lifecycle assurance.
Supply support for BAS321J-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 essential semiconductors - delivering discrete, logic, and MOSFET solutions engineered for automotive, industrial, and computing applications.
The BAS321J-Q belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, designed specifically for robust transient suppression and polarity protection in harsh automotive environments where long-term reliability and parametric consistency are non-negotiable.
FAQ
Is BAS321J-Q suitable for 48 V mild-hybrid vehicle systems?
Yes. With VRRM = 250 V and AEC-Q101 qualification, BAS321J-Q meets ISO 26262 ASIL-B supporting requirements for 48 V bus clamping. Its 150 °C Tj rating and 190 K/W Rth(j-sp) ensure thermal stability under sustained 48 V load-dump pulses when mounted on ≥1 cm² cathode copper.
What is the maximum allowable surge current for BAS321J-Q in a 100 µs pulse?
Per Table 5, the non-repetitive peak forward current is 9 A for tp = 100 µs square wave at Tj(init) = 25 °C. This value assumes FR4 PCB mounting with standard footprint; derating is required above 85 °C ambient due to thermal impedance curves in Figure 2.
Does BAS321J-Q have a specified junction-to-case thermal resistance?
No - the datasheet specifies Rth(j-a) = 300 K/W and Rth(j-sp) = 190 K/W (to solder point), but does not define a discrete case interface. Thermal design must reference junction-to-solder-point resistance and use the cathode pad as the primary heat transfer path per Figure 10 layout.
Can BAS321J-Q replace BAS21 in existing designs?
No - BAS21 is DO-35 through-hole with 250 V VRRM but 300 ns trr and 1 A IF, while BAS321J-Q is SOD323F SMD with 50 ns trr, 250 mA IF, and AEC-Q101 qualification. The packages, thermal profiles, and switching performance differ significantly; redesign and requalification are required.
BAS321J-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- 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-323F
- Operating Temperature - Junction:
- 150°C
BAS321J-QX FAQ
1.How can I place an order for BAS321J-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS321J-QX 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 BAS321J-QX reliable?
The price and inventory of BAS321J-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS321J-QX is usually 5 days.
3.What payment methods are accepted for BAS321J-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS321J-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS321J-QX?
BAS321J-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS321J-QX 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 BAS321J-QX?
For technical support, including BAS321J-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS321J-QX requirements.
6.How does Aetrix verify that BAS321J-QX is sourced from the original manufacturer or authorized distributors?
All BAS321J-QX 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 BAS321J-QX meets industry standards.
7.What is the process for return or replacement of BAS321J-QX?
All BAS321J-QX units undergo pre-shipment inspection (PSI). If there is an issue with BAS321J-QX, 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 BAS321J-QX part is unused and in its original packaging.
Return procedure for BAS321J-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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