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Nexperia USA Inc. BAS21TH-QVL
- Part No.:
- BAS21TH-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS21TH-QVL.pdf
- Description:
- BAS21TH-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,298
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Product details
Overview
BAS21TH-QVL from Nexperia is a high-voltage switching diode in SOT23 package, rated for 250 V repetitive peak reverse voltage (VRRM), 200 mA forward current (IF), and 50 ns reverse recovery time (trr); designed for automotive-grade high-speed switching in engine control units and power supply rail clamping.
For engineers reviewing the BAS21TH-QVL datasheet, BAS21TH-QVL pinout, BAS21TH-QVL application, or BAS21TH-QVL equivalent, key selection criteria include AEC-Q101 qualification, 175 °C junction temperature rating, low 100 nA reverse leakage at 200 V, and verified SOT23 pin compatibility with anode/cathode/no-connect configuration.
Technical Context
This discrete high-voltage switching diode uses silicon PN-junction technology optimized for fast transient response and thermal robustness. Its 50 ns trr enables reliable operation in 100 kHz–1 MHz switching converters, while the 250 V VRRM supports flyback snubber and inductive load commutation in 24 V/48 V automotive systems.
The device features a thermally enhanced SOT23 footprint with cathode-connected tab (Rth(j-sp) = 330 K/W), enabling stable performance up to 175 °C ambient. Its 1.25 V VF at 200 mA and 5 pF capacitance at 0 V VR support low-loss, low-noise signal routing in high-frequency sensing and protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 250 V - supports continuous reverse blocking in 24 V/48 V automotive power rails with safety margin against transients. |
| trr | 50 ns - enables clean turn-off in high-frequency DC-DC converters and PWM-driven inductive loads without tail current. |
| IF | 200 mA - sufficient for signal-level switching and auxiliary power path control in ECUs and body electronics. |
| VF @ 200 mA | 1.25 V - minimizes conduction loss and self-heating during pulsed operation in space-constrained SMT layouts. |
| IR @ 200 V | 100 nA - ensures negligible leakage in high-impedance bias networks and precision voltage clamp applications. |
| Tj max | 175 °C - qualified for under-hood environments including transmission control modules and battery management sensors. |
| Rth(j-a) | 500 K/W - defines thermal derating on standard FR4 PCB; power dissipation limited to 300 mW at Tamb ≤ 25 °C. |
Pinout & Package
Package: SOT23 (TO-236AB), 3-terminal surface-mount plastic package, 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to higher-potential node in clamping or switching path. |
| 2 | No Connect (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder joint required. |
| 3 | Cathode (K) | Forward current exit and reverse voltage reference; tied to ground or low-side return in most configurations. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements-enables direct deployment in ASIL-B subsystems without requalification. |
| High-temperature operation | Junction rated to 175 °C-supports placement near power MOSFETs or in engine bay modules without thermal derating penalties. |
| Low reverse recovery charge | 50 ns trr with 30 mA IF/IR conditions-reduces switching losses and EMI in flyback and boost converter snubbers. |
| Small SOT23 footprint | Standardized 3-pin layout compatible with automated pick-and-place and reflow processes-no special tooling or inspection needed. |
| Low leakage at high VR | 100 nA IR at 200 V reverse bias-preserves accuracy in high-impedance voltage monitoring and reference divider networks. |
Applications
| Engine Control Unit (ECU) Protection | Automotive LED Driver Clamping |
|---|---|
|
Use Scenario: Suppressing inductive kickback from fuel injector solenoids and ignition coils in 12 V/48 V hybrid architectures. IC Role / Device Role / Timing Role: High-voltage freewheeling diode placed across inductive load to clamp reverse EMF within safe limits during MOSFET turn-off. Use Value: 250 V VRRM withstands >200 V transients; 50 ns trr prevents voltage overshoot exceeding MCU I/O tolerance during rapid current decay. |
Use Scenario: Voltage clamping in constant-current LED driver stages powering exterior lighting (headlamps, DRLs) in AEC-Q101-compliant designs. IC Role / Device Role / Timing Role: Transient voltage suppressor connected between LED string and driver output to absorb overvoltage spikes during PWM dimming transitions. Use Value: 100 nA IR ensures no current diversion from LED current sink at 200 V standoff; 1.25 V VF avoids forward conduction during normal operation. |
| Body Control Module (BCM) Signal Switching | Onboard Charger (OBC) Auxiliary Power Supply |
|
Use Scenario: Level-shifting and isolation of wake-up signals (e.g., LIN bus, door sensor inputs) in thermally demanding cabin modules. IC Role / Device Role / Timing Role: Bidirectional signal steering diode used in open-drain interface protection networks with pull-up resistors. Use Value: 175 °C Tj rating allows uninterrupted operation at 125 °C ambient; 5 pF capacitance preserves signal integrity up to 100 MHz edge rates. |
Use Scenario: Input rectification and reverse polarity protection in 12 V auxiliary supplies derived from OBC's high-voltage DC link. IC Role / Device Role / Timing Role: High-reliability switching diode in half-wave rectifier stage feeding isolated DC-DC controller for gate drivers and sensors. Use Value: 200 mA IF rating matches typical auxiliary load demand; AEC-Q101 qualification ensures long-term stability under repeated thermal cycling. |
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 MMBD2103LT1G | VRRM = 200 V (50 V lower); trr = 50 ns; VF = 1.25 V at 200 mA; AEC-Q101 qualified. | Limited to 24 V systems with lower transient margins; not recommended for 48 V mild-hybrid or starter-generator interfaces. | Select when cost sensitivity outweighs need for 250 V headroom and under-hood thermal margin. |
| Diodes Incorporated BAV21WQ-7-F | VRRM = 250 V; trr = 50 ns; VF = 1.25 V at 200 mA; AEC-Q101 qualified; SOD-123 package (larger footprint). | Requires PCB redesign due to SOD-123 outline; higher Rth(j-a) (~600 K/W) reduces power handling at elevated ambient. | Choose only if existing design uses SOD-123 and board real estate permits larger thermal pad area. |
Compared with MMBD2103LT1G and BAV21WQ-7-F, BAS21TH-QVL delivers identical switching speed and forward voltage but uniquely combines 250 V VRRM, 175 °C operation, and SOT23 compactness-making it optimal for next-generation automotive power nodes where space, thermal density, and transient resilience are co-constrained.
Availability
BAS21TH-QVL is available at Aetrix Electronics and suitable for engine control units, automotive LED drivers, body control modules, and onboard charger auxiliary supplies requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for BAS21TH-QVL 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 components and advanced packaging technologies.
The BAS21TH-QVL belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for robust transient suppression and fast switching in automotive power management and signal conditioning systems.
FAQ
Is BAS21TH-QVL pin-compatible with standard SOT23 diodes like BAT54 series?
No-BAS21TH-QVL has Pin 2 marked "n.c." (not connected), whereas BAT54-series dual diodes use all three pins. Direct substitution requires verification of circuit topology; unused Pin 2 must remain unconnected and un-soldered to avoid parasitic coupling or thermal mismatch.
What is the maximum continuous forward current at 125 °C ambient temperature?
At Tamb = 125 °C, the device's Ptot derates to ~120 mW (per Fig. 1). With VF ≈ 1.25 V, this supports ~96 mA continuous IF. For pulsed operation (duty cycle ≤ 0.02), 200 mA remains valid per datasheet conditions (tp ≤ 300 µs).
Does BAS21TH-QVL require special PCB layout considerations for thermal performance?
Yes-thermal resistance Rth(j-a) = 500 K/W assumes standard FR4 with single-side copper and tin-plated finish. To maintain 175 °C Tj, minimize local copper removal around Pin 3 (cathode), avoid thermal vias under the package body, and ensure ≥1.5 mm clearance from adjacent heat sources.
Can BAS21TH-QVL be used in bidirectional TVS-like clamping applications?
No-it is a unidirectional PN diode, not a bidirectional TVS. It conducts only in forward bias and blocks up to 250 V in reverse. For bidirectional transient suppression, a dedicated TVS array (e.g., PUSB3FR4) or back-to-back diode configuration is required.
BAS21TH-QVL 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
- Operating Temperature - Junction:
- 175°C
BAS21TH-QVL FAQ
1.How can I place an order for BAS21TH-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21TH-QVL 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 BAS21TH-QVL reliable?
The price and inventory of BAS21TH-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21TH-QVL is usually 5 days.
3.What payment methods are accepted for BAS21TH-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21TH-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21TH-QVL?
BAS21TH-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21TH-QVL 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 BAS21TH-QVL?
For technical support, including BAS21TH-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21TH-QVL requirements.
6.How does Aetrix verify that BAS21TH-QVL is sourced from the original manufacturer or authorized distributors?
All BAS21TH-QVL 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 BAS21TH-QVL meets industry standards.
7.What is the process for return or replacement of BAS21TH-QVL?
All BAS21TH-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BAS21TH-QVL, 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 BAS21TH-QVL part is unused and in its original packaging.
Return procedure for BAS21TH-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS21TH-QVL Tags
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