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Nexperia USA Inc. BAS21,235
- Part No.:
- BAS21,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS21,235.pdf
- Description:
- DIODE GP 200V 200MA TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:37,705
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Product details
Overview
BAS21,235 from Nexperia is a high-voltage switching diode in SOT23 package, rated for 250 V repetitive peak reverse voltage (VRRM), 200 mA continuous forward current (IF), and 50 ns reverse recovery time (trr). It features low leakage (100 nA at 200 V, 25 °C), low capacitance (5 pF), and operates up to 150 °C junction temperature - used in voltage clamping and reverse polarity protection circuits in industrial power supplies.
For engineers reviewing the BAS21,235 datasheet, BAS21,235 pinout, BAS21,235 application, or BAS21,235 equivalent, key selection criteria include VRRM margin above system rail, trr suitability for 100–500 kHz switching frequencies, thermal derating on FR4 PCBs, and SOT23 footprint compatibility with automated assembly.
Technical Context
The BAS21,235 is a silicon planar epitaxial switching diode optimized for high-voltage transient suppression and fast turn-off. Its 250 V VRRM rating supports operation across 100–200 V DC rails, while its 50 ns trr enables use in flyback snubbers and relay driving circuits where stored charge must be cleared rapidly.
Thermal performance is defined by Rth(j-a) = 500 K/W on FR4, requiring ambient derating above 70 °C; the 200 mA IF rating assumes Tamb ≤ 25 °C, dropping to ~100 mA at 100 °C per Fig. 5. The n.c. (pin 2) terminal confirms internal single-diode construction with no integrated guard ring or substrate tap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 250 V - supports 200 V DC bus designs with 25 % safety margin against transients |
| trr | 50 ns - enables reliable operation up to 500 kHz in hard-switched topologies |
| IF | 200 mA continuous - sufficient for biasing, signal-level clamping, and low-power relay drivers |
| IR | 100 nA @ 200 V, 25 °C - ensures minimal leakage in high-impedance voltage-sense paths |
| Cd | 5 pF @ 0 V, 1 MHz - preserves signal integrity in RF-coupled or high-speed logic interfaces |
| Tj max | 150 °C - allows operation in sealed industrial enclosures without active cooling |
| Rth(j-a) | 500 K/W on FR4 - requires >100 mm² copper pour for full-rated power dissipation |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch); thermally enhanced for reflow soldering on standard FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to higher-potential node in clamping or rectification path |
| 2 | Not connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or thermal pad connection |
| 3 | Cathode (K) | Forward current exit point; ties to reference/ground or lower-potential node in protection circuits |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | 50 ns trr enables clean turn-off in 100–500 kHz flyback snubbers and gate-drive clamp networks |
| High-voltage blocking | 250 V VRRM supports direct interface with 170 VAC-derived DC rails and telecom -48 V systems |
| Low junction capacitance | 5 pF minimizes signal distortion in RF detector and high-frequency sampling applications |
| Small-footprint packaging | SOT23 footprint reduces board area by 60 % vs. DO-35, enabling dense power management layouts |
Applications
| Industrial Power Supply Clamping | Automated Test Equipment (ATE) Protection |
|---|---|
Use Scenario: Suppresses inductive kickback from solenoid drivers in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: Fast-recovery clamping diode placed across coil terminals to limit voltage spikes to <250 V. Use Value: Prevents MOSFET drain-source breakdown during 200 mA coil de-energization with <50 ns response. |
Use Scenario: Protects precision analog input channels from ESD and overvoltage events during probe contact. IC Role / Device Role / Timing Role: High-impedance reverse-biased clamp limiting transient excursions to ±200 V. Use Value: 100 nA leakage preserves µV-level measurement accuracy; 5 pF avoids bandwidth degradation. |
| DC Motor Polarity Reversal | Telecom Line Interface |
Use Scenario: Blocks reverse current flow when H-bridge outputs are asymmetrically driven in brushed DC motor control. IC Role / Device Role / Timing Role: Reverse-polarity protection diode in series with supply rail to prevent backfeed into driver ICs. Use Value: 200 mA rating handles stall currents; 1.25 V VF at 200 mA ensures <250 mW dissipation at full load. |
Use Scenario: Provides overvoltage clamping on -48 V telecom line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary high-voltage clamp referenced to chassis ground in line-side protection stage. Use Value: 250 V VRRM exceeds ITU-T K.20 surge immunity requirements; SOT23 enables compact dual-rail layout. |
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 MMBD2102LT1G | VRRM = 200 V (lower than BAS21,235's 250 V); trr = 50 ns; same SOT23 package | Limited to ≤170 V DC systems; unsuitable for 200 V rail clamping | Select only if VRRM margin ≥15 % is acceptable and sourcing favors ON Semi distribution |
| Diodes Incorporated BAV21W-7-F | VRRM = 250 V; trr = 50 ns; SOD-123 package (larger footprint, higher Rth(j-a)) | Requires PCB redesign; thermal resistance 400 K/W vs. BAS21,235's 500 K/W on FR4 | Choose when higher surge current handling (IFSM = 4 A) is prioritized over board space |
Compared with MMBD2102LT1G and BAV21W-7-F, BAS21,235 uniquely balances 250 V blocking, SOT23 miniaturization, and 500 K/W thermal resistance - making it optimal for space-constrained industrial power modules requiring precise VRRM headroom.
Availability
BAS21,235 is available at Aetrix Electronics and suitable for industrial power supply clamping, automated test equipment protection, DC motor polarity reversal, and telecom line interface applications requiring stable component supply and long-term production continuity.
Supply support for BAS21,235 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, headquartered in Nijmegen, Netherlands.
The BAS21 series belongs to Nexperia's high-voltage switching diode product line, engineered specifically for robust transient suppression and fast switching in industrial and telecom infrastructure where reliability under thermal stress is critical.
FAQ
Is BAS21,235 automotive qualified?
No. BAS21,235 is not automotive qualified per AEC-Q101. It is rated for industrial and commercial use only. Nexperia offers the BAS21-Q variant for automotive applications, which undergoes additional qualification testing including temperature cycling and humidity bias life validation.
What is the maximum allowable ambient temperature for full 200 mA current rating?
The 200 mA IF rating applies only at Tamb ≤ 25 °C. As shown in Fig. 5 of the datasheet, the maximum continuous forward current drops linearly to approximately 100 mA at Tamb = 100 °C on FR4 PCB, due to thermal resistance limitations and junction temperature constraints.
Can pin 2 (n.c.) be grounded or left floating in PCB layout?
Pin 2 must remain unconnected - neither grounded nor tied to any net. The datasheet explicitly defines it as "not connected" (n.c.), and internal inspection confirms no die connection. Connecting it risks parasitic coupling or unintended thermal conduction paths.
How does BAS21,235 compare to BAS16 in high-voltage applications?
BAS21,235 has 250 V VRRM versus BAS16's 85 V, making it unsuitable as a drop-in replacement in 100+ V systems. BAS16 offers faster trr (4 ns) but cannot withstand voltage transients beyond 85 V - BAS21,235 trades speed for robustness in high-voltage clamping roles.
BAS21,235 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 200 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 200 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
- Operating Temperature - Junction:
- 150°C (Max)
BAS21,235 FAQ
1.How can I place an order for BAS21,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21,235 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 BAS21,235 reliable?
The price and inventory of BAS21,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21,235 is usually 5 days.
3.What payment methods are accepted for BAS21,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21,235?
BAS21,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21,235 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 BAS21,235?
For technical support, including BAS21,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21,235 requirements.
6.How does Aetrix verify that BAS21,235 is sourced from the original manufacturer or authorized distributors?
All BAS21,235 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 BAS21,235 meets industry standards.
7.What is the process for return or replacement of BAS21,235?
All BAS21,235 units undergo pre-shipment inspection (PSI). If there is an issue with BAS21,235, 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 BAS21,235 part is unused and in its original packaging.
Return procedure for BAS21,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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