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Nexperia USA Inc. BAS321-QF
- Part No.:
- BAS321-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BAS321-QF.pdf
- Description:
- DIODE GEN PURP 200V 250MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,409
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Product details
Overview
BAS321-Q 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 AEC-Q101 qualification for automotive use.
For engineers reviewing the BAS321-Q datasheet, BAS321-Q pinout, BAS321-Q application, or BAS321-Q equivalent, key selection considerations 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 automotive circuits.
Technical Context
The BAS321-Q is a single-junction, planar-diffused silicon diode optimized for fast switching in space-constrained SMD applications. Its 50 ns trr and low 2 pF capacitance at 0 V support high-frequency signal routing and transient suppression without parasitic oscillation.
Thermal design is constrained by its 366 K/W junction-to-ambient resistance on FR4 PCBs and 130 K/W junction-to-solder-point resistance-critical for sustained 250 mA operation in ambient temperatures up to 125 °C per derating curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Voltage (VF) | 1.25 V at 200 mA - defines conduction loss and self-heating during active switching |
| Reverse Recovery Time (trr) | 50 ns - enables reliable operation in 1–2 MHz switching circuits with minimal tail current |
| Repetitive Peak Reverse Voltage (VRRM) | 250 V - supports surge tolerance in 24 V automotive power rails and industrial 24/48 V systems |
| Continuous Forward Current (IF) | 250 mA - sets maximum DC load-handling capability on standard FR4 PCBs |
| Diode Capacitance (Cd) | 2 pF at 0 V, 1 MHz - minimizes signal distortion in RF coupling and high-speed logic interface paths |
| Junction Temperature (Tj) | 150 °C max - determines thermal margin for solder reflow and long-term reliability in sealed enclosures |
| Thermal Resistance (Rth(j-a)) | 366 K/W - requires careful copper area allocation on PCB to maintain Tj < 125 °C at full IF |
Pinout & Package
Package: SOD323 (SC-76), 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, tin-plated copper leads on FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal; connects to lower-potential node; solder point serves as primary thermal path (Rth(j-sp) = 130 K/W) |
| 2 | Anode (A) | Positive terminal; carries forward current into device; electrically isolated from cathode tab |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade temperature cycling, humidity, and mechanical shock per discrete semiconductor stress test standard |
| SOD323 footprint | Enables high-density layout in compact modules such as ADAS sensor hubs and body control units |
| 50 ns trr with low IR | Supports clean turn-off in flyback snubbers and level-shifting circuits without cross-conduction risk |
| 1.25 V VF @ 200 mA | Reduces forward power loss to ≤250 mW at rated current, easing thermal management on 1-layer PCBs |
| 2 pF capacitance | Preserves signal integrity in 10–100 MHz clock distribution and ESD protection clamping paths |
Applications
| Automotive Body Control Module | Industrial PLC Input Protection |
|---|---|
Use Scenario: Reverse polarity and transient protection on 12 V sensor supply lines in BCMs. IC Role / Device Role / Timing Role: General-purpose clamping diode placed between VCC and GND to shunt ESD and load dump spikes. Use Value: 250 V VR rating and AEC-Q101 qualification ensure compliance with ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Input stage protection for 24 V digital I/O channels in programmable logic controllers. IC Role / Device Role / Timing Role: Fast-switching clamp limiting voltage overshoot during field-wire disconnect transients. Use Value: 50 ns trr prevents latch-up in upstream logic ICs during 1 µs rise-time surges per IEC 61000-4-4. |
| Consumer Power Adapter Feedback Loop | Medical Infusion Pump Signal Isolation |
Use Scenario: Secondary-side rectification and feedback path isolation in compact AC/DC adapters. IC Role / Device Role / Timing Role: Low-capacitance, fast-recovery diode in optocoupler feedback circuitry. Use Value: 2 pF Cd avoids phase shift in TL431-based error amplifiers operating above 100 kHz. |
Use Scenario: Signal-level voltage clamping on analog sensor inputs in battery-powered infusion pumps. IC Role / Device Role / Timing Role: Low-leakage (100 nA at 200 V) diode protecting ADC front-end from ESD events. Use Value: 100 nA IR at 25 °C ensures <0.1 µV offset drift in 16-bit precision measurement paths. |
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 250 mA IF and 50 ns trr, but rated for 200 V VR only (no 250 V VRRM) | Lacks AEC-Q101 qualification; not approved for automotive under-hood use | Select when AEC-Q101 is unnecessary and cost sensitivity outweighs surge margin |
| Vishay VS-2EDH02-M3/84A | Higher 300 mA IF and 350 V VRRM, but larger SOD-123 package and 75 ns trr | Requires PCB redesign; better suited for higher-power 48 V industrial supplies | Choose only if system demands >250 V surge immunity and can accommodate 2.8 mm × 1.7 mm footprint |
Compared with NSVRBAS321WT1G and VS-2EDH02-M3/84A, the BAS321-Q uniquely balances AEC-Q101 compliance, 250 V VRRM headroom, and SOD323 miniaturization-making it optimal for automotive infotainment power sequencing and compact industrial I/O modules where board space and qualification are jointly constrained.
Availability
BAS321-Q is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input stages, and compact consumer power adapter designs requiring stable component supply, AEC-Q101 traceability, and SOD323 footprint consistency.
Supply support for BAS321-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-including diodes, MOSFETs, and logic devices-with manufacturing rooted in process control and automotive-grade quality systems.
The BAS321-Q belongs to Nexperia's AEC-Q101-qualified general-purpose diode product line, engineered specifically for robust, space-efficient switching in automotive and industrial environments where thermal stability and surge resilience are non-negotiable.
FAQ
Is the BAS321-Q suitable for 24 V industrial power rail protection?
Yes. With a 250 V repetitive peak reverse voltage rating and AEC-Q101 qualification, the BAS321-Q withstands common 24 V system transients including IEC 61000-4-4 EFT bursts and ISO 7637-2 load dump pulses up to ±100 V. Its 50 ns trr ensures fast clamping response without oscillation in typical 10–100 Ω source impedances.
What is the maximum ambient temperature for continuous 250 mA operation?
Per Figure 1 in the datasheet, the BAS321-Q supports 250 mA continuous forward current up to approximately 125 °C ambient temperature when mounted on a standard FR4 PCB with single-sided 1 oz copper. Derating begins linearly beyond that point due to its 366 K/W Rth(j-a) and 150 °C Tj limit.
Does the BAS321-Q have a marked cathode indicator?
Yes. The BAS321-Q uses the marking code "A7" laser-etched on the top surface of the SOD323 package, positioned adjacent to the cathode (pin 1). This aligns with the standard SOD323 orientation where the cathode band is located at the end opposite the marking, confirmed in Figure 8 of the datasheet.
Can the BAS321-Q replace the BAS21 in existing SOD323 layouts?
No. Although both are SOD323 diodes, the BAS21 has a 250 V VRRM but only 225 mA IF and 150 ns trr-significantly slower than the BAS321-Q's 50 ns. Substitution would degrade switching performance and may cause overheating in high-frequency applications; layout compatibility does not imply functional equivalence.
BAS321-QF 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-QF FAQ
1.How can I place an order for BAS321-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS321-QF 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-QF reliable?
The price and inventory of BAS321-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS321-QF is usually 5 days.
3.What payment methods are accepted for BAS321-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS321-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS321-QF?
BAS321-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS321-QF 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-QF?
For technical support, including BAS321-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS321-QF requirements.
6.How does Aetrix verify that BAS321-QF is sourced from the original manufacturer or authorized distributors?
All BAS321-QF 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-QF meets industry standards.
7.What is the process for return or replacement of BAS321-QF?
All BAS321-QF units undergo pre-shipment inspection (PSI). If there is an issue with BAS321-QF, 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-QF part is unused and in its original packaging.
Return procedure for BAS321-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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