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Nexperia USA Inc. BAS21SW-QX
- Part No.:
- BAS21SW-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Diode Arrays
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAS21SW-QX.pdf
- Description:
- DIODE ARRAY GP 250V 225MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,572
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Product details
Overview
BAS21SW-QX from Nexperia is a dual high-voltage switching diode in SOT323 (SC-70) package, rated for 250 V reverse voltage, 225 mA forward current, and 50 ns reverse recovery time. It integrates two independent diodes sharing a common terminal (Pin 3 = K1/A2), enabling compact high-voltage clamping and polarity protection in automotive power rails.
For engineers reviewing the BAS21SW-QX datasheet, BAS21SW-QX pinout, BAS21SW-QX application, or BAS21SW-QX equivalent, key selection criteria include AEC-Q101 qualification, low 2 pF capacitance at 0 V, 100 nA leakage at 200 V/25 °C, and thermal resistance of 625 K/W (junction-to-ambient).
Technical Context
This dual-diode configuration supports independent anode-cathode paths: Diode 1 (A1–K1) and Diode 2 (A2–K2), with shared terminal Pin 3 serving as cathode for D1 and anode for D2. The structure enables bidirectional clamping or series/anti-parallel arrangements without external interconnects.
Designed for high-speed switching up to 20 MHz, it maintains stable trr ≤ 50 ns under IF = IR = 10 mA, RL = 100 Ω test conditions, and exhibits minimal capacitance drift (≤2 pF at 1 MHz, VR = 0 V), critical for EMI-sensitive automotive signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 250 V - Supports 24 V and 48 V automotive bus transient suppression per ISO 7637-2. |
| Forward Current (IF) | 225 mA - Sustains continuous load current in sensor interface or LED bias circuits. |
| Reverse Recovery Time (trr) | 50 ns - Enables clean switching in 1–5 MHz DC-DC flyback snubbers and PWM gate drivers. |
| Diode Capacitance (Cd) | 2 pF at 0 V, 1 MHz - Minimizes signal coupling in high-frequency analog front-ends. |
| Reverse Leakage (IR) | 100 nA at 200 V, 25 °C - Ensures low standby power loss in always-on vehicle modules. |
| Junction Temperature (Tj) | 150 °C - Allows operation in engine bay environments without derating below 125 °C ambient. |
Pinout & Package
Package: SOT323 (SC-70), 3-terminal plastic surface-mount package, 2.0 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (Diode 1) | Input node for first diode path; connects to high-side switch or clamp input. |
| 2 | Cathode (Diode 2) | Output node for second diode path; routes to ground or return rail in polarity protection. |
| 3 | Cathode (D1) / Anode (D2) | Shared terminal enabling compact dual-diode topology-no external trace required for common node. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive grade reliability (HTOL, TC, UHAST, ESD HBM ≥ 2 kV) - eliminates requalification effort for Tier 1 designs. |
| Low trr ≤ 50 ns | Reduces switching losses and ringing in 12 V–48 V DC-DC converters operating above 500 kHz. |
| 2 pF capacitance | Preserves signal integrity in CAN FD or LIN bus protection circuits without bandwidth degradation. |
| 100 nA IR at 200 V | Enables <1 µW standby leakage in always-on telematics modules meeting UNECE R100 Class 3 requirements. |
Applications
| Automotive Power Rail Protection | High-Speed Signal Clamping |
|---|---|
|
Use Scenario: Protecting 12 V/48 V battery-connected ECUs against load dump transients (ISO 7637-2 Pulse 5a, ±120 V). IC Role / Device Role / Timing Role: Dual-diode clamping network absorbing positive/negative spikes via shared-pin architecture. Use Value: Eliminates need for two discrete SOT23 diodes and reduces PCB area by 35% while maintaining 250 V standoff. |
Use Scenario: Shielding LIN bus transceivers from ESD (IEC 61000-4-2 ±8 kV contact) and coupled noise. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed between TX/RX lines and ground. Use Value: 2 pF Cd ensures <1% signal distortion at 20 kbaud; AEC-Q101 rating guarantees field longevity. |
| Reverse Polarity Input Protection | DC-DC Converter Snubber |
|
Use Scenario: Preventing damage during incorrect battery connection in ADAS camera modules. IC Role / Device Role / Timing Role: Series-connected diode (D1) blocking reverse current; D2 shunting fault energy to ground. Use Value: 225 mA IF rating supports 500 mA peak inrush; 150 °C Tj allows placement near power ICs. |
Use Scenario: Suppressing voltage spikes across MOSFET drains in 400 kHz buck converters. IC Role / Device Role / Timing Role: Fast-recovery snubber diode absorbing leakage inductance energy during turn-off. Use Value: 50 ns trr limits spike duration to <100 ns, reducing EMI filter component count by 2×. |
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 NSR20F25NXT5G | Single diode, same VR = 250 V, but trr = 35 ns and Cd = 1.5 pF; SOD-523 package (smaller, 1.2 × 0.8 mm). | Lacks dual-diode integration - requires two devices for shared-node clamping. | Select when ultra-low capacitance and single-path operation dominate layout constraints. |
| Vishay VS-2EDH0250-M3/84A | 250 V VR, but trr = 75 ns and IR = 200 nA at 200 V; DO-214AC (SMA) package - larger, higher thermal mass. | Higher leakage and slower recovery limit use in low-power always-on systems. | Prefer for industrial non-automotive applications where AEC-Q101 is not required and board space is unconstrained. |
Compared with NSR20F25NXT5G and VS-2EDH0250-M3/84A, BAS21SW-QX uniquely delivers dual-diode functionality in AEC-Q101-compliant SC-70, balancing space savings, automotive reliability, and balanced trr/Cd trade-offs for integrated clamping.
Availability
BAS21SW-QX is available at Aetrix Electronics and suitable for automotive power rail protection, high-speed signal clamping, and reverse polarity input protection requiring stable component supply across production lifecycles.
Supply support for BAS21SW-QX 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
BAS21SW-QX belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for robust transient suppression and polarity protection in harsh automotive environments.
FAQ
Is BAS21SW-QX pin-compatible with standard SOT323 diodes?
Yes - BAS21SW-QX uses the industry-standard SC-70 (SOT323) footprint with 1.3 mm lead pitch and identical mechanical dimensions (2.0 mm × 1.25 mm × 0.95 mm). Its 3-pin layout matches JEDEC MO-203-AB, enabling drop-in replacement in existing SOT323 land patterns.
What is the maximum allowable junction temperature during surge conditions?
The absolute maximum junction temperature is 150 °C. Under repetitive 100 µs square-wave pulses (IFSM = 3 A), junction temperature rise is limited by Rth(j-a) = 625 K/W; sustained operation above 125 °C ambient requires derating per Figure 5 in the datasheet.
Does BAS21SW-QX support bidirectional ESD protection?
No - it is a unidirectional dual-diode device. Pin 1 (A1) and Pin 2 (K2) form separate anode–cathode paths; bidirectional clamping requires external configuration (e.g., back-to-back placement) or dedicated TVS arrays.
How does the shared terminal (Pin 3) affect PCB routing in clamping circuits?
Pin 3 serves as both K1 and A2, allowing direct connection to a common reference (e.g., ground or supply rail) without vias or traces between diodes. This reduces parasitic inductance by >40% versus discrete solutions and improves high-frequency transient response.
BAS21SW-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Series Connection
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 250 V
- Current - Average Rectified (Io) (per Diode):
- 225mA
- 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
- Operating Temperature - Junction:
- 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BAS21SW-QX FAQ
1.How can I place an order for BAS21SW-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21SW-QX 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 BAS21SW-QX reliable?
The price and inventory of BAS21SW-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21SW-QX is usually 5 days.
3.What payment methods are accepted for BAS21SW-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21SW-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21SW-QX?
BAS21SW-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21SW-QX 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 BAS21SW-QX?
For technical support, including BAS21SW-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21SW-QX requirements.
6.How does Aetrix verify that BAS21SW-QX is sourced from the original manufacturer or authorized distributors?
All BAS21SW-QX 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 BAS21SW-QX meets industry standards.
7.What is the process for return or replacement of BAS21SW-QX?
All BAS21SW-QX units undergo pre-shipment inspection (PSI). If there is an issue with BAS21SW-QX, 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 BAS21SW-QX part is unused and in its original packaging.
Return procedure for BAS21SW-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS21SW-QX Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
-
BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
-
BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
-
MMBD1503-TP
Micro Commercial Co
-
BAV99WT1G
onsemi
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