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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

Nexperia USA Inc. BAS21SW,115

Name: BAS21SW,115
Brand: Nexperia USA Inc.
SKU: BAS21SW,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAS21SW,115

Manufacturer:: Nexperia USA Inc.

Category:: Diode Arrays

Package:: SC-70, SOT-323

Datasheet:: BAS21SW,115.pdf

Description:: DIODE ARRAY GP 250V 225MA SOT323

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BAS21SW from Nexperia is a dual high-voltage switching diode in SOT323 (SC-70) package, configured as two independent diodes sharing a common terminal (pin 3). It delivers 250 V reverse voltage rating, ≤50 ns reverse recovery time, ≤2 pF capacitance, and AEC-Q101 qualification for automotive use. It serves in high-speed, high-voltage clamping and polarity protection circuits.

For engineers reviewing the BAS21SW datasheet, BAS21SW pinout, BAS21SW application, or BAS21SW equivalent, key selection criteria include reverse voltage margin (250 V), switching speed (trr ≤ 50 ns), leakage performance at 200 V (≤100 nA), thermal resistance (Rth(j-a) = 625 K/W), and dual-diode topology with shared cathode/anode pin.

Technical Context

The BAS21SW integrates two discrete high-voltage PN junctions in a single SC-70 package, with pin 3 serving as both cathode of diode 1 and anode of diode 2 - enabling compact dual-switching or series/anti-parallel configurations. Its design targets fast transient response under high reverse bias, supported by low stored charge and minimal junction capacitance.

Thermal performance is defined for FR4 PCB mounting (single-sided copper, tin-plated), with Rth(j-a) = 625 K/W and Rth(j-sp) = 300 K/W. Absolute maximum ratings include 225 mA continuous forward current per diode and 1.7 A non-repetitive peak forward current (10 ms pulse).

Key Specifications

Parameter	Value and Actual Design Meaning
Reverse Voltage (VR)	250 V - supports clamping or blocking in 200 V rail systems with 25 % safety margin
Reverse Recovery Time (trr)	≤50 ns - enables reliable operation in >1 MHz switching applications
Junction Capacitance (Cd)	≤2 pF at 0 V - minimizes signal coupling and timing skew in high-frequency routing
Forward Voltage (VF)	1.25 V at 200 mA - limits conduction loss in low-duty-cycle protection paths
Reverse Leakage (IR)	≤100 nA at 200 V, 25 °C - ensures low standby power in always-on clamp circuits
Thermal Resistance (Rth(j-a))	625 K/W - requires derating above 25 °C ambient; max 200 mW total dissipation at Tamb ≤ 25 °C
AEC-Q101 Qualified	Yes - validated for automotive temperature range (−40 °C to +150 °C) and stress testing

Pinout & Package

Package: SOT323 (SC-70), 3-lead surface-mount plastic package, dimensions 2.0 mm × 1.25 mm × 0.95 mm, 1.3 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (Diode 1)	Input terminal for first diode; connects to high-side switch node or signal source
2	Cathode (Diode 2)	Output terminal for second diode; used for clamped return path or reverse-biased output
3	Cathode (Diode 1) / Anode (Diode 2)	Shared terminal enabling compact dual-diode topologies - e.g., series connection or bidirectional clamp

Key Features

Feature	Design Value
High-speed switching	trr ≤ 50 ns ensures minimal dead-time distortion in 1–5 MHz DC-DC or motor gate drive snubbers
High reverse voltage capability	250 V VR rating allows direct use across 200 V bus rails without series stacking
Low junction capacitance	≤2 pF Cd reduces capacitive loading on high-impedance nodes like comparator inputs or RF bias lines
AEC-Q101 qualification	Validated for automotive underhood environments including thermal cycling, HTRB, and ESD robustness
Ultra-compact SOT323 footprint	2.0 mm × 1.25 mm body saves >60 % board area vs. SOT23 while maintaining solderability

Applications

High-Speed Voltage Clamping

Reverse Polarity Protection

Use Scenario: Protecting 24 V or 48 V automotive ECUs from load-dump transients up to 120 V with sub-100 ns response.

IC Role / Device Role / Timing Role: Dual-diode configuration used in back-to-back arrangement (pins 1–3 and 3–2) to clamp both positive and negative excursions.

Use Value: 250 V VR and ≤50 ns trr prevent latch-up during ISO 7637-2 Pulse 5a events without external TVS dependency.

Use Scenario: Preventing damage when connecting battery terminals incorrectly in portable medical devices or industrial sensors.

IC Role / Device Role / Timing Role: Single diode (e.g., pins 1–3) placed in series with power input to block reverse current flow.

Use Value: ≤100 nA IR at 200 V ensures <1 µW standby loss; 225 mA IF rating supports 200 mA system loads.

High-Voltage Signal Routing

Automotive CAN Bus Protection

Use Scenario: Isolating analog sensor signals (e.g., knock or pressure sensors) referenced to 12 V battery rail in engine control modules.

IC Role / Device Role / Timing Role: Diode 1 (pins 1–3) used as level-shift clamp; Diode 2 (pins 3–2) provides return-path limiting.

Use Value: ≤2 pF capacitance avoids signal integrity degradation up to 100 MHz; 1.25 V VF limits offset error in precision bias networks.

Use Scenario: Adding secondary overvoltage protection on CAN_H/CAN_L lines alongside primary TVS in ADAS domain controllers.

IC Role / Device Role / Timing Role: Dual-diode structure (pins 1–3 and 3–2) forms low-capacitance steering network to shunt ±120 V faults to ground/VCC.

Use Value: AEC-Q101 qualification ensures reliability across −40 °C to +125 °C; 50 ns trr prevents data corruption during fast transients.

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 NSVBA215WT1G	Single diode, same VR (250 V), trr = 50 ns, but higher VF (1.35 V @ 200 mA) and no AEC-Q101 claim	Lacks dual-diode topology and automotive qualification; suitable only for non-automotive 250 V clamping	Select only if dual-diode function is unnecessary and AEC-Q101 is not required
Diodes Inc. BAV21W-7-F	Single diode, VR = 250 V, trr = 40 ns, but SOT23 package (larger), no AEC-Q101, IR = 100 nA same	Requires two devices for dual functionality; lacks shared-pin integration and automotive validation	Choose only when board space permits larger footprint and automotive compliance is not mandated

Compared with NSVBA215WT1G and BAV21W-7-F, the BAS21SW uniquely combines dual-diode integration, AEC-Q101 qualification, and SC-70 miniaturization - reducing component count, qualifying for under-hood use, and saving >40 % PCB area versus dual-SOT23 solutions.

Availability

BAS21SW is available at Aetrix Electronics and suitable for automotive ECU protection, industrial power supply clamping, and portable medical device polarity safeguards requiring stable component supply and long-term lifecycle support.

Supply support for BAS21SW 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, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

The BAS21SW belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for robust transient suppression and polarity protection in space-constrained automotive and industrial power systems.

FAQ

Is BAS21SW suitable for bidirectional transient voltage suppression?

Yes. Its dual-diode configuration (anode–cathode–shared terminal) allows implementation of a bidirectional clamp using a single device: connect pin 1 to the protected line, pin 2 to ground, and pin 3 to V_CC. This topology clamps both positive overvoltage (via diode 1) and negative transients (via diode 2), verified per ISO 7637-2 test waveforms.

What is the maximum continuous forward current per diode?

The maximum continuous forward current per diode is 225 mA at T_amb ≤ 25 °C on a standard FR4 PCB with single-sided copper. Derating is required above 25 °C: Fig. 5 shows linear reduction to zero at ~125 °C ambient for single-diode operation, based on R_th(j-a) = 625 K/W and P_tot = 200 mW limit.

Can BAS21SW replace BAS21 in existing designs?

No. Although both are high-voltage switching diodes, BAS21SW is a dual-diode device in SOT323 with shared pin 3, whereas BAS21 is a single-diode SOT23 part. Pin compatibility, electrical topology, and package dimensions differ fundamentally - redesign is required to leverage the dual-diode functionality or fit the smaller SC-70 footprint.

Does BAS21SW require special PCB layout considerations for thermal performance?

Yes. To achieve the rated 200 mW power dissipation, the SOT323 footprint must follow Nexperia's recommended reflow land pattern (Fig. 8): 0.55 mm × 0.6 mm pads, 1.325 mm center spacing, and 2.35 mm × 2.65 mm solder resist opening. Thermal vias are not specified, but minimizing trace length to copper pours improves R_th(j-a) performance beyond the 625 K/W baseline.

BAS21SW,115 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 (DC)

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 (Max)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BAS21SW,115 FAQ

1.How can I place an order for BAS21SW,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BAS21SW,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 BAS21SW,115 reliable?

The price and inventory of BAS21SW,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21SW,115 is usually 5 days.

3.What payment methods are accepted for BAS21SW,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21SW,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAS21SW,115?

BAS21SW,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAS21SW,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 BAS21SW,115?

For technical support, including BAS21SW,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21SW,115 requirements.

6.How does Aetrix verify that BAS21SW,115 is sourced from the original manufacturer or authorized distributors?

All BAS21SW,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 BAS21SW,115 meets industry standards.

7.What is the process for return or replacement of BAS21SW,115?

All BAS21SW,115 units undergo pre-shipment inspection (PSI). If there is an issue with BAS21SW,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 BAS21SW,115 part is unused and in its original packaging.

Return procedure for BAS21SW,115:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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