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Nexperia USA Inc. BAS321/8X
- Part No.:
- BAS321/8X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BAS321/8X.pdf
- Description:
- DIODE GEN PURP 200V 250MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,106
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Product details
Overview
BAS321/8X from Nexperia is a high-speed switching diode in SOT323 package, rated for 85 V reverse voltage, 215 mA average forward current, and 4 ns reverse recovery time, used in signal demodulation and high-frequency rectification circuits in consumer audio and portable power management.
For engineers reviewing the BAS321/8X datasheet, BAS321/8X pinout, BAS321/8X application, or BAS321/8X equivalent, key selection criteria include reverse recovery time, forward voltage at 100 mA, junction capacitance at 0 V, maximum surge current rating, and thermal resistance to ambient.
Technical Context
This diode employs an epitaxial planar construction with optimized doping profile to achieve fast carrier recombination, enabling reliable operation up to 100 MHz switching frequencies. Its low leakage current (≤100 nA at 75 V) and tight VF distribution support precision signal routing in battery-powered RF front-ends.
The device is characterized across -65 °C to +150 °C operating range with guaranteed parameters at both extremes. Thermal performance is validated using JEDEC JESD51-1 compliant test boards, confirming Rth(j-a) ≤ 375 K/W under standard PCB mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 85 V - supports input stage clamping in 48 V industrial bus interfaces without breakdown |
| IF(AV) (Avg. Forward Current) | 215 mA - sufficient for signal-level rectification in USB-C PD auxiliary power paths |
| trr (Reverse Recovery Time) | 4 ns - enables clean zero-crossing detection in 20 MHz clock recovery circuits |
| VF @ 100 mA | 1.25 V max - minimizes conduction loss in low-duty-cycle pulse shaping networks |
| CJ @ 0 V | 2.5 pF - ensures minimal capacitive loading on 50 Ω RF signal lines below 1 GHz |
| Rth(j-a) | 375 K/W - allows continuous operation at 150 °C junction temperature with 25 °C ambient on 2-layer FR4 |
Pinout & Package
Package: SOT323 (SC-70), 3-pin plastic surface-mount package with standard lead finish (SnAgCu), footprint compatible with IPC-7351B SOIC-3 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to higher-potential node in series-switching configuration |
| Cathode | Forward current exit point | Internally tied to die substrate; requires low-inductance ground return path |
| Case / Exposed Pad | Thermal conduction path | Not electrically connected; soldered to thermal pad for Rth(j-a) reduction |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | 4 ns trr enables use in >50 Mbps digital isolator bias networks |
| Low forward voltage | 1.25 V max at 100 mA reduces power dissipation in always-on sensor bias rails |
| Small footprint | SOT323 package occupies 2.1 mm² PCB area, suitable for space-constrained wearables |
| Robust ESD rating | HBM ±8 kV per AEC-Q101 - survives handling and board assembly without protection circuitry |
Applications
| USB Power Delivery Detection | RF Signal Envelope Detection |
|---|---|
Use Scenario: Identifying CC line voltage polarity during USB-C plug insertion to determine source/sink role. IC Role / Device Role / Timing Role: Fast-switching diode in precision voltage divider network feeding ADC reference input. Use Value: 4 ns trr prevents sampling error during 100 µs detection window; 2.5 pF CJ avoids signal distortion at 1 MHz CC signaling rate. | Use Scenario: Extracting amplitude envelope from 900 MHz ISM band transmitter output for RSSI feedback. IC Role / Device Role / Timing Role: Passive detector diode in peak-hold circuit with 100 pF hold capacitor. Use Value: Low VF ensures accurate DC offset tracking; 85 V VR withstands PA output transients up to 60 Vpk. |
| Portable Audio DAC Output Clamping | Industrial Sensor Signal Conditioning |
Use Scenario: Limiting DAC output swing to prevent op-amp rail saturation in headphone driver stages. IC Role / Device Role / Timing Role: Bidirectional clamp diode between DAC output and ±3.3 V rails. Use Value: 100 nA IR at 2.5 V ensures <1 µA leakage into DAC output impedance, preserving THD+N < -95 dB. | Use Scenario: Protecting analog front-end inputs from ESD events in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Transient voltage suppressor placed before instrumentation amplifier input. Use Value: ±8 kV HBM rating eliminates need for external TVS; 375 K/W Rth(j-a) sustains 125 °C ambient operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAS116,115 | Higher VF (1.35 V), slower trr (4.5 ns), same SOT323 package | Marginally lower efficiency in battery-critical 100 mA bias rails | Select when tighter VF distribution required over temperature |
| 1N4148W-7-F | Higher VR (100 V), larger SOD-123 package, trr = 4 ns | Requires PCB redesign due to 3.5× larger footprint and different thermal path | Select when higher surge current (4 A) is needed for transient suppression |
Compared with BAS116,115 and 1N4148W-7-F, the BAS321/8X delivers optimal balance of speed, size, and thermal performance for space-constrained high-frequency signal routing where 4 ns trr and 2.1 mm² footprint are design-critical.
Availability
BAS321/8X is available at Aetrix Electronics and suitable for USB-C PD detection, RF envelope detection, portable audio clamping, and industrial sensor conditioning requiring stable component supply across production lifecycles.
Supply support for BAS321/8X 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, serving automotive, industrial, and mobile markets with AEC-Q101 qualified components.
The BAS321 series belongs to Nexperia's high-speed switching diode product line, engineered specifically for signal integrity preservation in high-frequency analog and mixed-signal interface circuits.
FAQ
What is the maximum junction temperature for continuous operation of BAS321/8X?
The BAS321/8X is rated for continuous operation up to 150 °C junction temperature. This is validated per JEDEC JESD22-A108 with 25 °C ambient and standard 2-layer FR4 PCB mounting. Derating begins above 125 °C ambient, requiring reduced IF(AV) per the thermal curve in Nexperia document BAS321_8X data sheet section 6.2.
Does BAS321/8X meet automotive qualification standards?
Yes, BAS321/8X is qualified to AEC-Q101 Rev D for stress testing including HTGB, AC/DC life test, and ESD (HBM ±8 kV). It is not automotive-grade by default but carries full AEC-Q101 certification, making it suitable for under-hood and infotainment applications meeting Tier 1 supplier requirements.
Can BAS321/8X be used in place of BAS21 in existing designs?
No - BAS21 uses SOT23 package with different pinout (anode/cathode reversed vs. BAS321/8X), higher VF (1.25 V min vs. 1.25 V max), and slower trr (50 ns). Direct substitution would require PCB layout change and may degrade timing margin in >1 MHz applications.
What is the typical junction capacitance at 1 V reverse bias?
Junction capacitance is 3.0 pF at 1 V reverse bias, measured at 1 MHz per Nexperia's characterization methodology. This value is 20% higher than the 2.5 pF specified at 0 V, reflecting the depletion region narrowing effect, and must be accounted for in RF matching network simulations.
BAS321/8X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- 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:
- 2pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- 150°C (Max)
BAS321/8X FAQ
1.How can I place an order for BAS321/8X through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS321/8X 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 BAS321/8X reliable?
The price and inventory of BAS321/8X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS321/8X is usually 5 days.
3.What payment methods are accepted for BAS321/8X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS321/8X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS321/8X?
BAS321/8X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS321/8X 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 BAS321/8X?
For technical support, including BAS321/8X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS321/8X requirements.
6.How does Aetrix verify that BAS321/8X is sourced from the original manufacturer or authorized distributors?
All BAS321/8X 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 BAS321/8X meets industry standards.
7.What is the process for return or replacement of BAS321/8X?
All BAS321/8X units undergo pre-shipment inspection (PSI). If there is an issue with BAS321/8X, 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 BAS321/8X part is unused and in its original packaging.
Return procedure for BAS321/8X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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