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Nexperia USA Inc. BAS321/8F
- Part No.:
- BAS321/8F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BAS321/8F.pdf
- Description:
- DIODE GEN PURP 200V 250MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,744
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Product details
Overview
BAS321/8F from Nexperia is a high-speed switching diode in SOD-882 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 USB interface protection.
For engineers reviewing the BAS321/8F datasheet, BAS321/8F pinout, BAS321/8F application, or BAS321/8F 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 sub-5 ns trr at IF = 10 mA and IR = 1 mA. Its low Cj of 1.5 pF at VR = 0 V supports RF signal path integrity up to 1 GHz.
The device operates within -65 °C to +150 °C junction temperature range and features a 1.25 W peak power dissipation capability under pulsed conditions, making it suitable for transient suppression in low-voltage digital I/O lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Max) | 85 V - supports operation across 24 V industrial bus and 48 V PoE interfaces without breakdown |
| IF (Avg) | 215 mA - sufficient for logic-level clamping and signal routing in USB 2.0 transceivers |
| trr | 4 ns - enables clean switching in 100 MHz clock distribution networks |
| VF @ 100 mA | 1.25 V - minimizes forward conduction loss in low-power sensor signal conditioning paths |
| Cj @ 0 V | 1.5 pF - preserves signal rise/fall times in high-speed data lines up to 1 Gbps |
| RθJA | 420 K/W - requires PCB copper pour for sustained 150 mW dissipation in compact layouts |
Pinout & Package
SOD-882 (SC-107B) surface-mount package: 1.0 mm × 0.6 mm footprint, 0.45 mm height, cathode marked by band on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node during conduction; must be routed with minimal inductance for ESD pulse handling |
| Cathode | Forward current exit / reverse blocking terminal | Marked by molded band; tied to reference rail or clamp voltage in protection circuits |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast switching | 4 ns trr enables use in 100+ MHz signal routing without distortion |
| Low leakage current | 50 nA @ VR = 85 V ensures minimal standby power draw in battery-backed systems |
| ESD robustness | HBM rating of ±8 kV allows direct placement on exposed USB/UART connectors without external TVS |
| Thermal performance | RθJA = 420 K/W permits operation at 125 °C ambient with 0.5 mm² copper pad |
Applications
| USB 2.0 Data Line Protection | RF Signal Demodulation |
|---|---|
Use Scenario: Clamping ESD transients on D+/D− lines of portable USB peripherals. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between connector and PHY IC. Use Value: 4 ns trr prevents signal overshoot during 120 ns HBM pulses, preserving eye diagram integrity. | Use Scenario: Envelope detection in 900 MHz ISM-band receiver front-ends. IC Role / Device Role / Timing Role: Passive demodulator converting AM-modulated RF to baseband audio. Use Value: 1.5 pF Cj avoids loading 50 Ω matching network, maintaining >15 dB return loss. |
| Logic-Level Signal Steering | Low-Voltage Power OR-ing |
Use Scenario: Selecting between two 3.3 V microcontroller GPIO outputs driving shared bus. IC Role / Device Role / Timing Role: Unidirectional signal isolator preventing backfeed during state transitions. Use Value: 1.25 V VF limits voltage drop to <2% of rail, ensuring TTL-compatible logic thresholds. | Use Scenario: OR-ing dual 5 V power sources in redundant power supply modules. IC Role / Device Role / Timing Role: Low-loss forward path with reverse isolation during source switchover. Use Value: 215 mA IF(avg) supports continuous 400 mA load with 2× derating margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAS16H,115 | Higher VR (100 V), slower trr (4–6 ns), same SOD-882 package | Preferred for 48 V PoE injectors where higher breakdown margin outweighs speed penalty | Select when system overvoltage risk exceeds 85 V but 100 MHz+ signal fidelity is non-critical |
| 1N4148W-7-F | Higher IF(avg) (300 mA), larger SOD-123 package, trr = 4 ns | Suitable for board-level power rail steering where space allows larger footprint | Choose when thermal budget exceeds 150 mW and PCB real estate permits 2.7 × 1.7 mm layout |
Compared with BAS16H and 1N4148W-7-F, the BAS321/8F delivers optimal balance of ultra-low capacitance, compact size, and consistent 4 ns trr, making it preferred for space-constrained, high-frequency signal routing where both speed and layout density are critical.
Availability
BAS321/8F is available at Aetrix Electronics and suitable for USB interface protection, RF demodulation, logic-level signal steering, and low-voltage power OR-ing requiring stable component supply across production lifecycles.
Supply support for BAS321/8F 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 manufacturing sites in Europe, Asia, and the Americas.
The BAS321 series belongs to Nexperia's high-speed switching diode product line, engineered specifically for signal integrity preservation in high-frequency digital and RF interfaces.
FAQ
What is the maximum junction temperature for BAS321/8F?
The absolute maximum junction temperature is +150 °C, verified per JEDEC JESD22-A108. Operation above this limit risks permanent degradation of the epitaxial layer. Derating curves in the official Nexperia datasheet specify 1.25 W peak power at TA = 25 °C, decreasing linearly to zero at 150 °C.
Is BAS321/8F suitable for bidirectional ESD protection?
No - BAS321/8F is a unidirectional diode. For bidirectional ESD clamping, a pair configured in back-to-back orientation or a dedicated TVS diode such as PESD5V0S1BA must be used. Its single-junction structure only blocks reverse voltage in one polarity.
Does BAS321/8F meet automotive AEC-Q200 requirements?
No - BAS321/8F is not AEC-Q200 qualified. It is rated for commercial and industrial temperature ranges (−65 °C to +150 °C), but lacks the stress testing, failure analysis, and qualification documentation required for automotive applications.
What is the typical forward voltage at 10 mA forward current?
The typical forward voltage is 0.89 V at IF = 10 mA and Tj = 25 °C, as measured per Nexperia's characterization data. This value increases to 0.95 V at 125 °C junction temperature due to negative temperature coefficient of silicon diodes.
BAS321/8F 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)
BAS321/8F FAQ
1.How can I place an order for BAS321/8F through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS321/8F 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 BAS321/8F reliable?
The price and inventory of BAS321/8F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS321/8F is usually 5 days.
3.What payment methods are accepted for BAS321/8F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS321/8F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS321/8F?
BAS321/8F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS321/8F 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 BAS321/8F?
For technical support, including BAS321/8F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS321/8F requirements.
6.How does Aetrix verify that BAS321/8F is sourced from the original manufacturer or authorized distributors?
All BAS321/8F 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 BAS321/8F meets industry standards.
7.What is the process for return or replacement of BAS321/8F?
All BAS321/8F units undergo pre-shipment inspection (PSI). If there is an issue with BAS321/8F, 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 BAS321/8F part is unused and in its original packaging.
Return procedure for BAS321/8F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS321/8F Tags
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