My Inquiry
My Account
Nexperia USA Inc. BAS21-QVL
- Part No.:
- BAS21-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS21-QVL.pdf
- Description:
- DIODE SCHOTT 200V 200MA TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,888
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BAS21-QVL 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 AEC-Q101 qualification for automotive use.
For engineers reviewing the BAS21-QVL datasheet, BAS21-QVL pinout, BAS21-QVL application, or BAS21-QVL equivalent, this device serves as a fast, high-voltage clamp or polarity protection element where compact size, thermal robustness (Tj = 150 °C), and stable reverse characteristics under elevated temperature are critical selection criteria.
Technical Context
The BAS21-QVL operates as a unidirectional silicon switching diode optimized for high-speed transitions under high reverse bias. Its 50 ns trr enables reliable performance in flyback snubbers and DC-DC converter freewheeling paths where rapid turn-off minimizes switching losses.
With a maximum junction temperature of 150 °C and thermal resistance Rth(j-a) = 500 K/W on FR4, it sustains operation in thermally constrained automotive cabin modules and industrial power supplies without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 250 V - supports transient overvoltage clamping up to 250 V peak in automotive 12 V/24 V systems |
| trr | 50 ns - enables efficient high-frequency (>1 MHz) switching in boost converters and ESD protection circuits |
| IF | 200 mA continuous - suitable for signal-level and low-power supply rail switching, not main power path conduction |
| Cd | 5 pF at 0 V, 1 MHz - minimizes capacitive loading on high-impedance timing or sensing nodes |
| IR | 100 nA at VR = 200 V, Tj = 25 °C - ensures negligible leakage in battery-backed or low-quiescent-current circuits |
| Tj max | 150 °C - qualified for under-hood automotive environments per AEC-Q101 stress testing |
Pinout & Package
Encapsulated in a standard SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch), the BAS21-QVL uses a 3-terminal configuration with Pin 1 = Anode (A), Pin 2 = Not Connected (n.c.), Pin 3 = Cathode (K).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to higher-potential node during conduction |
| 2 | Not Connected (n.c.) | No internal bond wire; electrically isolated; must remain unconnected on PCB |
| 3 | Cathode (K) | Forward current exit point; ties to lower-potential node or ground reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD tests per discrete semiconductor standard |
| Low trr (≤50 ns) | Reduces reverse recovery charge (Qrr), limiting voltage overshoot and EMI in inductive switching circuits |
| Small SOT23 footprint | Enables high-density layout in space-constrained ECUs and ADAS sensor modules without thermal derating penalties |
| 150 °C junction rating | Supports uninterrupted operation in ambient temperatures up to +105 °C on FR4 with standard copper pour |
Applications
| Automotive Cabin Control Module | Industrial PLC Input Protection |
|---|---|
Use Scenario: Reverse polarity protection for 12 V power input to HVAC control unit. IC Role / Device Role / Timing Role: Unidirectional blocking diode placed in series with VIN to prevent damage from incorrect battery connection. Use Value: Withstands 250 V transients and maintains <100 nA leakage at 85 °C ambient, preserving sleep-mode current budget. |
Use Scenario: Voltage clamping on 24 V digital input channel exposed to inductive load kickback. IC Role / Device Role / Timing Role: Fast-recovery clamp diode shunting flyback energy into supply rail during relay deactivation. Use Value: 50 ns trr limits clamping delay, reducing voltage overshoot below 30 V and preventing input stage latch-up. |
| USB-C Power Delivery Adapter | Smart Meter Auxiliary Power Supply |
Use Scenario: High-side switch for auxiliary 5 V rail enabling/disabling based on CC line detection. IC Role / Device Role / Timing Role: Low-capacitance (5 pF) switching diode isolating PD controller logic from primary-side feedback loop. Use Value: Minimal capacitive coupling prevents signal integrity degradation on high-speed CC communication lines. |
Use Scenario: Freewheeling path for transformer-coupled auxiliary supply feeding metrology IC bias rails. IC Role / Device Role / Timing Role: Fast recovery diode conducting during transformer reset phase in flyback-derived auxiliary supply. Use Value: Low VF (1.25 V @ 200 mA) and 50 ns trr minimize conduction loss and improve efficiency at 100 kHz switching frequency. |
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 (vs. 250 V); trr = 50 ns; IF = 200 mA; same SOT23-3 package | Lacks AEC-Q101 qualification; not recommended for automotive under-hood use | Select when cost sensitivity outweighs automotive qualification requirements and 200 V VRRM suffices |
| Diodes Incorporated BAV21W-7-F | VRRM = 250 V; trr = 50 ns; IF = 250 mA; SOD-123 package (larger footprint, higher Rth(j-a)) | Higher IF rating but 2× larger board area and 650 K/W thermal resistance on FR4 | Prefer when higher surge current handling is needed and PCB space permits larger package |
Compared with MMBD2102LT1G and BAV21W-7-F, the BAS21-QVL uniquely combines AEC-Q101 qualification, 250 V VRRM, and SOT23 footprint-making it the only option meeting automotive thermal and reliability constraints without sacrificing board area.
Availability
BAS21-QVL is available at Aetrix Electronics and suitable for automotive cabin control modules, industrial PLC input protection circuits, USB-C power delivery adapters, and smart meter auxiliary power supplies requiring stable component supply across extended production lifecycles.
Supply support for BAS21-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 specializing in high-performance, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The BAS21-QVL 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 and industrial environments.
FAQ
Is BAS21-QVL pin-compatible with BAS21-QL?
Yes - both share identical SOT23-3 pinning (Pin 1 = Anode, Pin 2 = n.c., Pin 3 = Cathode) and mechanical outline. The '-QVL' suffix denotes tape-and-reel packaging with specific moisture sensitivity level (MSL) and reel orientation per Nexperia's ordering conventions, not functional or pinout differences.
What is the maximum allowable ambient temperature for continuous operation at full 200 mA forward current?
Per Figure 5 in the datasheet, the maximum ambient temperature is 75 °C when mounted on a standard FR4 PCB with no additional copper pour. At 200 mA, thermal derating begins above this point due to Ptot = 250 mW limit and Rth(j-a) = 500 K/W, requiring reduced current or enhanced heatsinking above 75 °C.
Can BAS21-QVL be used in place of a Zener diode for voltage clamping?
No - the BAS21-QVL is a switching diode, not a Zener. It lacks controlled reverse breakdown; its specified VR = 200 V is a maximum operating limit, not a regulation voltage. For clamping at defined voltages, use a dedicated Zener or TVS diode such as PESD5V0S1BA.
Does the 'n.c.' pin require PCB routing or grounding?
No - Pin 2 is internally not connected and must remain unconnected on the PCB. Routing or grounding it may cause unintended parasitic coupling or solder bridging risks. The SOT23 footprint should allocate a pad for Pin 2 but leave it floating per Nexperia's recommended land pattern (sot023_fr).
BAS21-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:
- 150°C
BAS21-QVL FAQ
1.How can I place an order for BAS21-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21-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 BAS21-QVL reliable?
The price and inventory of BAS21-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21-QVL is usually 5 days.
3.What payment methods are accepted for BAS21-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21-QVL?
BAS21-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21-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 BAS21-QVL?
For technical support, including BAS21-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21-QVL requirements.
6.How does Aetrix verify that BAS21-QVL is sourced from the original manufacturer or authorized distributors?
All BAS21-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 BAS21-QVL meets industry standards.
7.What is the process for return or replacement of BAS21-QVL?
All BAS21-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BAS21-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 BAS21-QVL part is unused and in its original packaging.
Return procedure for BAS21-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS21-QVL Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
