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Nexperia USA Inc. BAS19-QR
- Part No.:
- BAS19-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS19-QR.pdf
- Description:
- BAS19-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,147
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Product details
Overview
BAS19-Q from Nexperia is a high-voltage switching diode in SOT23 package, rated for 100 V reverse voltage, 200 mA continuous forward current, and 50 ns reverse recovery time. It delivers low leakage (100 nA at 100 V, 25 °C), low capacitance (5 pF), and AEC-Q101 qualification for automotive-grade reliability in high-speed clamping and polarity protection circuits.
For engineers reviewing the BAS19-Q datasheet, BAS19-Q pinout, BAS19-Q application, or BAS19-Q equivalent, this discrete diode supports design validation of high-voltage transient suppression, reverse-battery protection, and fast-switching power rail conditioning where low trr and stable IR across temperature are critical selection criteria.
Technical Context
The BAS19-Q is a silicon planar epitaxial high-voltage switching diode optimized for rapid turn-off with controlled minority-carrier lifetime. Its trr ≤ 50 ns is measured under standardized conditions (IF = IR = 30 mA, RL = 100 Ω, IR(meas) = 3 mA), ensuring predictable timing in flyback snubbers and DC-DC synchronous rectifier freewheel paths.
Thermal performance is defined for FR4 PCB mounting: Rth(j-a) = 500 K/W and Rth(j-sp) = 330 K/W. Junction temperature is rated to 150 °C, with derated VR and IF above 100 °C ambient - enabling use in under-hood automotive modules without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 100 V - maximum continuous blocking capability; supports 24 V/48 V automotive systems with margin against load-dump transients. |
| trr (Reverse Recovery Time) | ≤ 50 ns - enables operation up to ~3 MHz switching frequency in hard-switched topologies without excessive switching loss. |
| IR (Reverse Current) | 100 nA at VR = 100 V, Tj = 25 °C - ensures minimal standby power loss in battery-backed or always-on circuits. |
| Cd (Diode Capacitance) | ≤ 5 pF at VR = 0 V, f = 1 MHz - reduces capacitive coupling noise in high-impedance signal path clamping applications. |
| IF (Forward Current) | 200 mA continuous - sufficient for ESD protection networks, bias supply steering, and low-power logic-level voltage clamping. |
| VF (Forward Voltage) | 1.25 V at IF = 200 mA, Tj = 25 °C - balances conduction loss and thermal rise in compact SOT23 footprint. |
| Tj (Junction Temp) | 150 °C - allows deployment in engine control units, body controllers, and ADAS sensors without thermal derating penalties. |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch), qualified per AEC-Q101 for automotive use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to higher-potential node in clamping or protection configuration. |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
| 3 | Cathode (K) | Forward current exit and reverse-blocking terminal; ties to ground or lower-potential rail in polarity protection. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | trr ≤ 50 ns enables clean edge transitions in 24 V CAN/LIN bus protection and DC-DC controller feedback loops. |
| AEC-Q101 qualification | Validated for automotive temperature cycling, humidity, and mechanical shock - eliminates requalification effort for Tier 1 designs. |
| Low leakage current | IR ≤ 100 nA at 100 V ensures <1 µW standby dissipation in always-on battery monitoring circuits. |
| Small SOT23 footprint | 2.9 mm × 1.3 mm area saves board space in multi-rail power supervisors and compact infotainment power sequencers. |
Applications
| Automotive Reverse Polarity Protection | Industrial DC-DC Flyback Snubber |
|---|---|
|
Use Scenario: Prevents damage when 12 V/24 V vehicle battery is connected backward to ECUs or lighting modules. IC Role / Device Role / Timing Role: Series-connected high-voltage diode providing unidirectional current path with minimal forward drop. Use Value: Blocks reverse current while maintaining <1.25 V conduction loss at 200 mA, preserving system efficiency and meeting ISO 16750-2 pulse 4 requirements. |
Use Scenario: Suppresses voltage spikes across primary-side MOSFETs in isolated 48 V–12 V flyback converters. IC Role / Device Role / Timing Role: Fast-recovery clamp diode absorbing leakage inductance energy during MOSFET turn-off. Use Value: 50 ns trr limits ringback duration and reduces EMI generation; 100 V VR withstands reflected output voltage plus margin. |
| Automotive LIN Bus Transient Clamping | Smart Sensor Power Rail Conditioning |
|
Use Scenario: Protects LIN transceiver I/O pins from ±30 V load-dump and jump-start transients in body electronics. IC Role / Device Role / Timing Role: Low-capacitance (5 pF) shunt diode clamping line voltage to safe levels without distorting 19.2 kbps signaling. Use Value: 5 pF capacitance avoids signal integrity degradation; 100 nA IR prevents false wake-up in sleep mode. |
Use Scenario: Stabilizes 3.3 V supply to MEMS accelerometers and pressure sensors in ADAS domain controllers. IC Role / Device Role / Timing Role: Low-leakage voltage clamp limiting rail overshoot during hot-swap or hot-plug events. Use Value: 100 nA IR at 100 V ensures <0.33 µW leakage into sensor reference nodes, preserving ADC accuracy and offset stability. |
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 |
|---|---|---|---|
| BAS21-Q | Higher VR = 250 V; identical SOT23 package and trr ≤ 50 ns; VF = 1.25 V at 200 mA. | Supports 48 V industrial systems and 24 V commercial vehicles with higher surge margin; same footprint. | Select when >100 V blocking is required without changing layout or thermal design. |
| 1N4148W-Q | Lower VR = 100 V but higher IF = 300 mA; trr ≤ 4 ns (faster); Cd = 4 pF; also AEC-Q101 qualified. | Better suited for ultra-fast digital signal clamping (e.g., SPI/CAN FD lines); less optimal for sustained 200 mA power rail duty. | Choose for sub-10 ns timing-critical signal integrity tasks where peak current is <100 mA. |
Compared with BAS21-Q and 1N4148W-Q, the BAS19-Q offers the optimal balance of 100 V rating, 200 mA capability, and 50 ns trr for cost-sensitive automotive power rail protection - avoiding overdesign while meeting OEM thermal and lifetime requirements.
Availability
BAS19-Q is available at Aetrix Electronics and suitable for automotive reverse polarity protection, industrial DC-DC snubbing, and smart sensor power rail conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BAS19-Q 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.
The BAS19-Q belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for robustness in automotive power management, ESD protection, and transient suppression applications.
FAQ
Is BAS19-Q suitable for 48 V automotive systems?
Yes - its 100 V VR rating provides sufficient margin for 48 V nominal systems subject to ISO 16750-2 load-dump pulses (up to 60 V). Derating curves confirm VR remains ≥70 V at 125 °C ambient, supporting under-hood deployment in 48 V mild-hybrid ECUs and gate drivers.
What is the significance of the 'n.c.' pin in SOT23 package?
Pin 2 is internally not connected and serves no electrical function. It must remain unconnected on the PCB to prevent mechanical stress on the die bond wire and avoid unintended coupling to adjacent traces. No routing or solder mask opening is required for this terminal.
How does BAS19-Q compare to standard 1N4148 in automotive use?
Unlike generic 1N4148 variants, BAS19-Q is fully AEC-Q101 qualified, with documented thermal resistance (Rth(j-a) = 500 K/W), guaranteed trr ≤ 50 ns across temperature, and production traceability to automotive process controls - making it acceptable for OEM PPAP submissions without additional qualification.
Can BAS19-Q be used in bidirectional TVS configurations?
No - it is a unidirectional diode with anode and cathode terminals. For bidirectional transient suppression, a dedicated TVS diode (e.g., PESD5V0S1BA) or back-to-back diode pair is required. BAS19-Q functions only as a forward-conducting / reverse-blocking element.
BAS19-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):
- 120 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 @ 100 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
BAS19-QR FAQ
1.How can I place an order for BAS19-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS19-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 BAS19-QR reliable?
The price and inventory of BAS19-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS19-QR is usually 5 days.
3.What payment methods are accepted for BAS19-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS19-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS19-QR?
BAS19-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS19-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 BAS19-QR?
For technical support, including BAS19-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS19-QR requirements.
6.How does Aetrix verify that BAS19-QR is sourced from the original manufacturer or authorized distributors?
All BAS19-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 BAS19-QR meets industry standards.
7.What is the process for return or replacement of BAS19-QR?
All BAS19-QR units undergo pre-shipment inspection (PSI). If there is an issue with BAS19-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 BAS19-QR part is unused and in its original packaging.
Return procedure for BAS19-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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