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Nexperia USA Inc. BAS321JX
- Part No.:
- BAS321JX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BAS321JX.pdf
- Description:
- DIODE GEN PURP 200V 250MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,100
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Product details
Overview
BAS321JX 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 and industrial power rails.
For engineers reviewing the BAS321JX datasheet, BAS321JX pinout, BAS321JX application, or BAS321JX equivalent, this page delivers verified electrical specs, thermal resistance values, AEC-Q101 qualification status, and real-world switching use cases - all confirmed from Nexperia's official 2018 product data sheet.
Technical Context
The BAS321JX is a silicon planar epitaxial switching diode optimized for high-speed turn-off with trr ≤ 50 ns under IF = 30 mA / IR = 30 mA test conditions. Its low 2 pF capacitance and 100 nA reverse leakage at 200 V support clean signal integrity in clamping and flyback snubbing circuits.
Designed for surface-mount reliability on FR4 PCBs, it features junction-to-ambient thermal resistance of 300 K/W (standard footprint) and 190 K/W (with 1 cm² cathode pad), enabling stable operation up to 150 °C junction temperature in constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 200 V - supports DC bus clamping in 12 V/24 V automotive systems without breakdown. |
| VRRM (Peak Reverse Voltage) | 250 V - withstands transient surges per IEC 61000-4-5 Level 3 in industrial control inputs. |
| trr (Reverse Recovery Time) | 50 ns - enables >2 MHz switching in DC-DC converter freewheel paths and snubber networks. |
| IR (Reverse Leakage) | 100 nA at 200 V, 25 °C - ensures minimal standby power loss in battery-backed polarity protection. |
| Cd (Diode Capacitance) | 2 pF at 0 V, 1 MHz - preserves high-frequency signal fidelity in RF detector and sampling circuits. |
| VF (Forward Voltage) | 1.25 V at 200 mA - limits conduction loss to <250 mW in continuous 250 mA switching applications. |
| Rth(j-a) | 300 K/W - defines thermal derating slope: max 250 mA allowable at Tamb = 75 °C on standard FR4. |
Pinout & Package
SOD323F (SC-90) plastic surface-mount package: 1.7 mm × 1.25 mm × 0.7 mm body, flat leads, cathode marked with "ED" on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to higher-potential node during reverse bias; solder pad must be ≥1 cm² for Rth(j-sp) = 40 K/W. |
| 2 | Anode (A) | Current entry point during forward conduction; routed to ground or low-side switch return path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements (HTOL, TC, HAST). |
| High VR / Low Cd trade-off | 200 V rating achieved without sacrificing capacitance - enables compact EMI filtering in CAN/LIN line protectors. |
| Low IR at elevated Tj | 100 µA max at 150 °C and 200 V - maintains reverse blocking integrity in under-hood ambient conditions. |
| Fast trr with low VF | 50 ns recovery at 1.25 V VF - reduces switching loss vs. general-purpose diodes like 1N4148 in 500 kHz+ SMPS. |
Applications
| Automotive Power Rail Protection | Industrial DC-DC Snubber Network |
|---|---|
Use Scenario: Reverse battery connection protection in 12 V/24 V vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional current blocking diode placed in series with main power input. Use Value: Prevents damage from −14 V transients while maintaining <1.3 V drop at 200 mA load current. |
Use Scenario: Clamp voltage spikes across MOSFET drains in isolated flyback converters. IC Role / Device Role / Timing Role: Fast-recovery clamp diode in RCD snubber circuit. Use Value: Limits peak drain voltage to <250 V with 50 ns turn-off, reducing MOSFET stress and EMI. |
| USB Port Polarity Guard | Signal Line Voltage Clamping |
Use Scenario: Preventing miswired USB-C cables from damaging host controller ICs. IC Role / Device Role / Timing Role: Series anode-cathode insertion between VBUS and downstream load. Use Value: Blocks reverse current with 100 nA leakage, preserving battery life in portable devices. |
Use Scenario: Protecting ADC inputs from overvoltage events in sensor interface boards. IC Role / Device Role / Timing Role: Low-capacitance clamp to rail (VDD/GND) on analog signal lines. Use Value: 2 pF capacitance avoids signal distortion up to 100 MHz; 200 V standoff handles ESD transients. |
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 MMBD3004L | Same SOD323F package; VRRM = 225 V, trr = 50 ns, but IR = 500 nA at 200 V. | Higher leakage reduces suitability for battery-critical reverse polarity guards. | Select when higher surge tolerance (225 V) outweighs leakage sensitivity. |
| Diodes Inc. BAV199 | SOT-363 package (3-pin); dual diode; VRRM = 100 V, trr = 4 ns - faster but lower voltage rating. | Not suitable for 200 V clamping; used only in low-voltage, ultra-fast logic-level clamping. | Choose only for sub-100 V, <10 ns timing-critical applications where dual configuration adds value. |
Compared with MMBD3004L and BAV199, the BAS321JX uniquely balances 200 V standoff, 50 ns speed, and 100 nA leakage in a single-diode SC-90 package - making it optimal for space-constrained automotive and industrial clamping where leakage and voltage rating are co-critical.
Availability
BAS321JX is available at Aetrix Electronics and suitable for automotive ECU protection, industrial DC-DC snubbers, and USB-C polarity guard circuits requiring stable component supply across production lifecycles.
Supply support for BAS321JX 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.
The BAS321JX belongs to Nexperia's high-voltage switching diode product line, engineered specifically for robust clamping and reverse polarity protection in harsh-environment automotive and industrial power systems.
FAQ
Is BAS321JX AEC-Q101 qualified?
Yes. The BAS321JX is fully qualified to AEC-Q101 Rev D for stress testing including HTOL, temperature cycling, and HAST. This qualification covers its use in automotive powertrain, chassis, and body electronics where reliability under thermal and mechanical stress is mandatory.
What is the maximum continuous forward current for BAS321JX?
The maximum continuous forward current is 250 mA when mounted on a standard FR4 PCB with single-sided copper and tin plating. At ambient temperatures above 75 °C, derating applies due to Rth(j-a) = 300 K/W - e.g., 150 mA max at Tamb = 100 °C.
Can BAS321JX replace 1N4148 in high-speed applications?
Yes, but only where voltage rating and leakage matter. BAS321JX offers 200 V VR vs. 1N4148's 100 V, and 100 nA IR vs. ~25 nA - superior for clamping, inferior for ultra-low-leakage signal routing. Its 50 ns trr matches 1N4148, but VF is higher (1.25 V vs. ~0.7 V at 10 mA).
What is the recommended reflow profile for SOD323F package?
Nexperia specifies JEDEC J-STD-020-compliant reflow: peak temperature 260 °C for ≤10 s, ramp-up ≤3 °C/s, ramp-down ≤6 °C/s. Figure 10 in the datasheet defines solder land dimensions: 0.5 mm × 0.6 mm pads with 0.6 mm spacing and 0.5 mm solder mask opening.
BAS321JX 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 (Max)
BAS321JX FAQ
1.How can I place an order for BAS321JX through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS321JX 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 BAS321JX reliable?
The price and inventory of BAS321JX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS321JX is usually 5 days.
3.What payment methods are accepted for BAS321JX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS321JX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS321JX?
BAS321JX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS321JX 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 BAS321JX?
For technical support, including BAS321JX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS321JX requirements.
6.How does Aetrix verify that BAS321JX is sourced from the original manufacturer or authorized distributors?
All BAS321JX 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 BAS321JX meets industry standards.
7.What is the process for return or replacement of BAS321JX?
All BAS321JX units undergo pre-shipment inspection (PSI). If there is an issue with BAS321JX, 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 BAS321JX part is unused and in its original packaging.
Return procedure for BAS321JX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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