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Nexperia USA Inc. BAS21TH-QR
- Part No.:
- BAS21TH-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS21TH-QR.pdf
- Description:
- BAS21TH-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,863
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Product details
Overview
BAS21TH-QR 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); it operates up to 175 °C junction temperature and is AEC-Q101 qualified for automotive power supply and signal routing applications.
For engineers reviewing the BAS21TH-QR datasheet, BAS21TH-QR pinout, BAS21TH-QR application, or BAS21TH-QR equivalent, this page delivers verified electrical specs, thermal derating behavior, automotive qualification status, and real-world switching performance under pulsed and continuous conditions.
Technical Context
The BAS21TH-QR is a silicon planar epitaxial high-speed switching diode optimized for fast turn-off in high-voltage DC-DC converters and automotive load switching. Its 50 ns trr and low 5 pF capacitance at 0 V enable clean transitions in 100 kHz–1 MHz switching nodes.
Thermal design is constrained by Rth(j-a) = 500 K/W on FR4 PCB and Rth(j-sp) = 330 K/W to cathode solder point, with power derating beginning above 25 °C ambient - critical for under-hood automotive modules operating up to 175 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 250 V - supports 200 V rail systems with 25 % safety margin against transients |
| IF | 200 mA continuous - suitable for low-power logic-level switching and sensor biasing |
| trr | 50 ns - enables efficient operation in 1 MHz switching converters without excessive switching loss |
| VF @ 200 mA | 1.25 V - limits conduction loss to ≤250 mW at full rated current |
| IR @ 200 V | 100 nA at 25 °C - ensures minimal leakage in high-impedance voltage divider or sample-hold circuits |
| Tj max | 175 °C - qualified for engine control units, transmission control modules, and ADAS power stages |
| Cd @ 0 V | 5 pF - reduces capacitive loading on high-frequency signal lines and clock distribution paths |
Pinout & Package
Encapsulated in SOT23 (TO-236AB) plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, FR4-compatible footprint per Fig. 10 and Fig. 11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to higher-potential node in series-switching configuration |
| 2 | Not connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Current return path; thermally coupled to PCB copper via solder joint - primary heat dissipation route |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature cycling, HTRB, and ESD tests - eliminates need for additional qualification effort |
| High-temperature operation | Rated for 175 °C junction temperature - enables placement near power MOSFETs or in sealed engine compartments |
| Low reverse recovery charge | 50 ns trr with 30 mA IF/IR test condition - minimizes voltage overshoot and EMI in flyback snubber networks |
| Small SOT23 footprint | Standardized 3-pin SMD outline - compatible with automated pick-and-place and reflow processes used in Tier-1 production lines |
Applications
| Automotive Engine Control Unit (ECU) | Industrial DC-DC Converter |
|---|---|
Use Scenario: Clamping transient spikes on 12 V battery-fed microcontroller I/O lines during load dump events. IC Role / Device Role / Timing Role: High-voltage transient suppression diode placed between MCU pin and ground rail. Use Value: Withstands 250 V VRRM and 100 nA IR at 200 V, ensuring signal integrity without leakage-induced offset drift. | Use Scenario: Freewheeling path in synchronous buck converter output stage operating at 500 kHz. IC Role / Device Role / Timing Role: Fast-recovery catch diode enabling efficient energy transfer during high-side switch off-time. Use Value: 50 ns trr and 5 pF Cd reduce switching losses and ringing, improving efficiency by ≥1.2 % at full load. |
| Automotive Body Control Module (BCM) | Medical Sensor Signal Conditioning |
Use Scenario: Reverse polarity protection for LIN bus transceiver power input in door module. IC Role / Device Role / Timing Role: Series-connected high-voltage blocking diode upstream of LDO regulator. Use Value: 200 mA IF rating supports peak LIN transceiver current surges while maintaining <1.25 V forward drop. | Use Scenario: Precision voltage reference decoupling in low-noise analog front-end for ECG amplifier. IC Role / Device Role / Timing Role: Low-leakage clamp diode protecting ADC input from overvoltage during ESD events. Use Value: 100 nA IR at 200 V prevents reference voltage shift in high-impedance bias networks. |
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 @ 200 mA | Lacks AEC-Q101 qualification; not recommended for automotive under-hood use | Select when cost sensitivity outweighs automotive qualification requirements and VRRM margin can be reduced |
| Vishay SMBT2103 | VRRM = 250 V; trr = 75 ns (25 ns slower); VF = 1.25 V @ 200 mA; Tj max = 150 °C | Lower max junction temperature limits use in high-ambient environments like power inverters | Prefer where thermal margin is sufficient and longer trr is acceptable in sub-200 kHz designs |
Compared with MMBD2103LT1G and SMBT2103, the BAS21TH-QR uniquely combines AEC-Q101 qualification, 250 V VRRM, 50 ns trr, and 175 °C operation - making it the only option qualified for high-reliability automotive power switching where both voltage headroom and thermal robustness are mandatory.
Availability
BAS21TH-QR is available at Aetrix Electronics and suitable for automotive engine control units, industrial DC-DC converters, and medical sensor signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BAS21TH-QR 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-QR belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for automotive power management, industrial switching supplies, and precision analog protection circuits.
FAQ
Is BAS21TH-QR pin-compatible with standard SOT23 diodes like 1N4148W?
No - BAS21TH-QR uses Pin 1 = Anode, Pin 2 = n.c., Pin 3 = Cathode, whereas 1N4148W uses Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = n.c. The n.c. pin position differs, so direct PCB replacement requires layout revision to avoid shorting or open circuits.
What is the maximum continuous reverse voltage at 125 °C ambient?
Per Figure 7 in the datasheet, the maximum continuous reverse voltage drops to approximately 160 V at Tamb = 125 °C. This derating is due to increased IR leakage and thermal runaway risk - design must ensure VR remains ≤160 V under worst-case ambient and self-heating conditions.
Does BAS21TH-QR support wave soldering?
Yes - Nexperia provides dedicated wave soldering footprint (Fig. 11) with 1.4 mm pad width and 2.2 mm spacing. Recommended preheat ≤100 °C, wave contact time 3–5 s, and peak temperature ≤260 °C to avoid package cracking or bond wire damage.
How does its 175 °C rating compare to typical SOT23 diodes?
Most SOT23 diodes are rated to 150 °C (e.g., MMBD2103LT1G), but BAS21TH-QR extends to 175 °C via optimized die attach and passivation - validated through 1000-cycle temperature cycling and 1000 h HTRB testing per AEC-Q101, enabling use in next-generation electric powertrain modules.
BAS21TH-QR 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-QR FAQ
1.How can I place an order for BAS21TH-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21TH-QR 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-QR reliable?
The price and inventory of BAS21TH-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21TH-QR is usually 5 days.
3.What payment methods are accepted for BAS21TH-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21TH-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21TH-QR?
BAS21TH-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21TH-QR 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-QR?
For technical support, including BAS21TH-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21TH-QR requirements.
6.How does Aetrix verify that BAS21TH-QR is sourced from the original manufacturer or authorized distributors?
All BAS21TH-QR 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-QR meets industry standards.
7.What is the process for return or replacement of BAS21TH-QR?
All BAS21TH-QR units undergo pre-shipment inspection (PSI). If there is an issue with BAS21TH-QR, 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-QR part is unused and in its original packaging.
Return procedure for BAS21TH-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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