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Nexperia USA Inc. BAS321,115
- Part No.:
- BAS321,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BAS321,115.pdf
- Description:
- DIODE GEN PURP 200V 250MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,401
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Product details
Overview
BAS321 from Nexperia is a general-purpose silicon switching diode fabricated in planar technology and 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 300 mW power dissipation - enabling compact, high-speed switching in space-constrained consumer and industrial PCBs.
For engineers reviewing the BAS321 datasheet, BAS321 pinout, BAS321 application, or BAS321 equivalent, key selection criteria include its 50 ns switching speed, 250 V peak reverse voltage capability, thermal resistance of 366 K/W on FR4, cathode/anode polarity marking (A7), and compatibility with standard reflow soldering footprints for SOD323.
Technical Context
The BAS321 operates as a unidirectional PN junction rectifier optimized for fast transient response and low forward conduction loss. Its planar construction ensures stable junction temperature up to 150 °C, while the SOD323 package enables high-density placement without compromising thermal performance on single-sided FR4 boards.
It exhibits 2 pF junction capacitance at 0 V reverse bias and 100 nA reverse leakage at 200 V/25 °C - characteristics critical for noise-sensitive signal routing and low-power standby circuits. The device is non-automotive qualified and intended for commercial-grade applications only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Voltage | 1.25 V at 200 mA - defines minimum drive voltage overhead in series-switched loads |
| Reverse Recovery Time | 50 ns - supports switching frequencies up to ~10 MHz in non-resonant topologies |
| Repetitive Peak Reverse Voltage | 250 V - sets maximum transient clamping margin above 200 V DC rail |
| Continuous Forward Current | 250 mA - determines sustained load-handling capacity on standard FR4 PCB |
| Junction-to-Ambient Thermal Resistance | 366 K/W - limits power derating to ~150 mW at 70 °C ambient on minimal copper |
| Diode Capacitance | 2 pF at 0 V, 1 MHz - minimizes signal coupling in RF bypass and high-speed logic interfaces |
Pinout & Package
The BAS321 is packaged in the SOD323 (SC-76) plastic surface-mount case measuring 1.7 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch. The package features a cathode band marking (A7) and is compatible with standard reflow and wave soldering profiles per Nexperia's footprint guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal; marked by cathode band; connects to lower-potential node in forward bias |
| 2 | Anode (A) | Positive terminal; unmarked end; connects to higher-potential node during conduction |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 50 ns trr enables use in 1–10 MHz digital signal routing and pulse conditioning |
| Low forward voltage drop | 1.25 V at 200 mA reduces conduction loss in battery-powered and low-voltage logic interfaces |
| Small-footprint SMD package | SOD323 outline allows >2× density vs. DO-35 or SOD123 in automated assembly |
| Controlled thermal resistance | Rth(j-a) = 366 K/W on FR4 permits predictable derating without heatsinking |
Applications
| Power Supply Rail Clamp | Signal-Level Clipping |
|---|---|
Use Scenario: Protecting 3.3 V or 5 V microcontroller I/O pins from ESD-induced overvoltage transients during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional clamping diode placed between signal line and VCC/GND rails. Use Value: 100 nA reverse leakage at 25 °C prevents measurable DC loading; 50 ns recovery avoids signal distortion in <10 MHz digital lines. | Use Scenario: Limiting analog sensor output swing to ADC input range in portable instrumentation. IC Role / Device Role / Timing Role: Passive clipping element in precision op-amp feedback path. Use Value: 2 pF junction capacitance preserves bandwidth beyond 100 MHz; 1.25 V VF ensures predictable clipping threshold under varying load. |
| DC-DC Converter Freewheeling | Logic-Level Translation Isolation |
Use Scenario: Providing freewheeling path for inductive kickback in 12 V → 3.3 V buck converter secondary stage. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in low-cost non-synchronous designs. Use Value: 250 mA IF rating supports typical 200 mA load currents; 250 V VRRM accommodates 12 V input surges with safety margin. | Use Scenario: Isolating open-drain GPIO outputs across different supply domains (e.g., 1.8 V MCU to 5 V peripheral). IC Role / Device Role / Timing Role: Unidirectional level-shifting diode in pull-up configuration. Use Value: Low 1.25 V VF ensures reliable turn-on at 1.8 V logic high; SOD323 size fits tight pitch between mixed-voltage BGA escape routes. |
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 MMBD301LT1G | Higher VF (1.3 V @ 200 mA); same SOD323 package; 200 V VR | Marginally higher conduction loss in battery-critical paths | Select when legacy ON Semi sourcing or dual-sourcing required |
| Diodes Incorporated BAV99W-7-F | Dual diode array in SOT-323; 70 V VR; 4 ns trr; 200 mA IF | Not suitable for 200 V reverse blocking; better for high-speed logic clamping | Choose only for sub-70 V, ultra-fast (<10 ns) signal routing where dual-channel layout saves space |
Compared with MMBD301LT1G and BAV99W-7-F, the BAS321 uniquely balances 200 V reverse blocking, 50 ns speed, and 1.25 V forward drop in a single-diode SOD323 - making it optimal for cost-sensitive, medium-voltage switching where thermal margin and footprint density are prioritized over nanosecond-level timing.
Availability
BAS321 is available at Aetrix Electronics and suitable for power supply rail clamp, signal-level clipping, DC-DC converter freewheeling, and logic-level translation isolation requiring stable component supply and consistent SOD323 packaging.
Supply support for BAS321 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 and industrial-grade components.
The BAS321 belongs to Nexperia's general-purpose diode product line, engineered for cost-effective, space-efficient switching in commercial-grade consumer, computing, and industrial control applications - not automotive or safety-critical systems.
FAQ
What is the maximum junction temperature for the BAS321?
The absolute maximum junction temperature is 150 °C, as defined in the Absolute Maximum Ratings table. Operation at this limit requires strict thermal management - including derated power dissipation per the Rth(j-a) = 366 K/W curve and adherence to the ambient temperature vs. forward current derating chart in Figure 1 of the datasheet.
Can the BAS321 be used in automotive applications?
No. The BAS321 is explicitly designated as non-automotive qualified in the revision history and legal disclaimers. It has not undergone AEC-Q101 stress testing or automotive qualification. For automotive use, Nexperia offers Q-qualified alternatives such as the BAS321-Q series, which must be selected separately.
What does the 'A7' marking on the BAS321 indicate?
The 'A7' marking is the manufacturer-specific code for the BAS321 device in the SOD323 package, per Table 4 of the datasheet. It appears adjacent to the cathode band and serves as both part identification and polarity indicator - the band denotes the cathode (Pin 1), and 'A7' confirms authenticity and package type.
Is the BAS321 suitable for high-frequency RF applications?
It is suitable only for limited RF functions - specifically as a low-leakage, low-capacitance (2 pF) clamp or limiter below 100 MHz. Its 50 ns reverse recovery time and lack of specified RF parameters (e.g., S-parameters, noise figure) preclude use as an RF switch or mixer diode in cellular or WiFi front-ends.
BAS321,115 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- 150°C (Max)
BAS321,115 FAQ
1.How can I place an order for BAS321,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS321,115 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 BAS321,115 reliable?
The price and inventory of BAS321,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS321,115 is usually 5 days.
3.What payment methods are accepted for BAS321,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS321,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS321,115?
BAS321,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS321,115 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 BAS321,115?
For technical support, including BAS321,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS321,115 requirements.
6.How does Aetrix verify that BAS321,115 is sourced from the original manufacturer or authorized distributors?
All BAS321,115 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 BAS321,115 meets industry standards.
7.What is the process for return or replacement of BAS321,115?
All BAS321,115 units undergo pre-shipment inspection (PSI). If there is an issue with BAS321,115, 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 BAS321,115 part is unused and in its original packaging.
Return procedure for BAS321,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS321,115 Tags
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