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Nexperia USA Inc. BAS21J-QX
- Part No.:
- BAS21J-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
BAS21J-QX.pdf
- Description:
- BAS21J-Q/SOD323F/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,025
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Product details
Overview
BAS21J-Q from Nexperia is a single high-speed switching diode in SOD323F (SC-90) package, rated for 300 V repetitive peak reverse voltage, 50 ns reverse recovery time, and 2 pF capacitance at 1 MHz - deployed in automotive-grade voltage clamping and reverse polarity protection circuits.
For engineers reviewing the BAS21J-Q datasheet, BAS21J-Q pinout, BAS21J-Q application, or BAS21J-Q equivalent, key selection criteria include trr ≤ 50 ns under IF = 30 mA/IR = 30 mA conditions, AEC-Q101 qualification, low leakage (≤150 nA at VR = 250 V, 25 °C), and thermal resistance Rth(j-sp) = 55 K/W to solder point.
Technical Context
This diode operates as a unidirectional, fast-recovery switching element with a silicon planar epitaxial construction. Its junction temperature rating of 150 °C and AEC-Q101 qualification confirm suitability for under-hood automotive environments where thermal cycling and reliability are critical.
The device exhibits low forward voltage (VF = 1.1 V at IF = 100 mA, pulsed), minimal capacitance (Cd = 2 pF at VR = 0 V, f = 1 MHz), and robust surge capability (IFSM = 14.1 A for tp = 50 µs), enabling stable performance in transient-prone power rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - supports clamping in 24 V and 48 V automotive systems with margin against load dump transients |
| trr | 50 ns - enables operation in high-frequency switching up to ~3 MHz without excessive switching loss |
| Cd | 2 pF at 0 V, 1 MHz - minimizes signal distortion in RF-coupled or high-speed digital line protection |
| IR | 150 nA at VR = 250 V, 25 °C - ensures negligible standby current in battery-sensitive reverse polarity circuits |
| Rth(j-sp) | 55 K/W - enables effective heat transfer to PCB copper via cathode pad, supporting continuous 250 mA pulsed operation |
| Ptot | 550 mW at Tamb ≤ 25 °C - defines maximum dissipation on standard FR4 with 1 cm² cathode pad |
Pinout & Package
Encapsulated in SC-90 (SOD323F) package: 1.7 mm × 1.25 mm × 0.7 mm body, flat leads, excellent coplanarity, reflow-solder only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to PCB ground or lower-potential node; primary thermal path to solder point (Rth(j-sp) = 55 K/W) |
| 2 | Anode (A) | Input side for forward conduction; routed to supply or signal source requiring clamping or polarity control |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| trr ≤ 50 ns | Enables clean turn-off in 1–3 MHz switching regulators and snubber networks |
| Cd ≤ 2 pF | Preserves signal integrity in high-speed data line protection (e.g., LIN bus, sensor interfaces) |
| Low IR (150 nA @ 250 V) | Minimizes quiescent drain in always-on battery-connected circuits like telematics modules |
Applications
| Automotive Reverse Polarity Protection | High-Speed Voltage Clamping |
|---|---|
Use Scenario: Protecting 12 V/24 V infotainment head units from incorrect battery connection during service. IC Role / Device Role / Timing Role: Unidirectional blocking diode placed in series with main power input. Use Value: Prevents catastrophic failure with <150 nA leakage ensuring zero impact on sleep-mode current budget. |
Use Scenario: Suppressing inductive kickback from fuel injector drivers in engine control modules. IC Role / Device Role / Timing Role: Fast-recovery clamp across coil terminals to limit voltage spikes to ≤300 V. Use Value: 50 ns trr ensures energy dissipation before next PWM edge, avoiding latch-up or MOSFET avalanche stress. |
| General-Purpose SMD Switching | Low-Capacitance Signal Line Protection |
Use Scenario: Level-shifting and isolation in CAN transceiver bias networks. IC Role / Device Role / Timing Role: High-speed switching element toggling between logic states in auxiliary bias paths. Use Value: 250 mA pulsed rating supports transient current surges while maintaining <1.1 V VF for predictable voltage drop. |
Use Scenario: ESD and overvoltage protection on analog sensor inputs (e.g., temperature, pressure). IC Role / Device Role / Timing Role: Low-capacitance shunt diode to ground, activated above threshold voltage. Use Value: 2 pF capacitance avoids signal attenuation or phase shift in DC–10 MHz sensor bandwidths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAS21DW-Q | Dual configuration in SOT363; shared cathode; trr = 50 ns, VRRM = 300 V, Cd = 2 pF | Requires dual-channel clamping or matched pair switching; occupies larger footprint | Select when space permits and dual functionality reduces component count |
| 1N4148W-Q | Same SOD-123 package; VRRM = 100 V; trr = 4 ns; Cd = 4 pF; AEC-Q101 qualified | Lower voltage rating limits use to ≤12 V systems; faster but higher capacitance | Prefer for ultra-fast, low-voltage digital logic clamping where 300 V margin is unnecessary |
Compared with BAS21DW-Q and 1N4148W-Q, the BAS21J-Q uniquely balances 300 V standoff, 50 ns speed, and 2 pF capacitance in the smallest SOD323F footprint - making it optimal for space-constrained, high-voltage automotive protection where dual devices or voltage derating are not acceptable.
Availability
BAS21J-Q is available at Aetrix Electronics and suitable for automotive reverse polarity protection, high-speed voltage clamping, general-purpose SMD switching, and low-capacitance signal line protection requiring stable component supply and AEC-Q101 compliance.
Supply support for BAS21J-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 essential semiconductors for automotive, industrial, and consumer markets.
The BAS21J-Q belongs to Nexperia's AEC-Q101-qualified high-speed switching diode product line, engineered specifically for robust voltage clamping and polarity protection in harsh automotive environments.
FAQ
Is BAS21J-Q suitable for reflow soldering only?
Yes - the datasheet explicitly states reflow soldering is the only recommended method. Wave or hand soldering is not qualified due to thermal stress risks on the SOD323F package. The device's thermal resistance values (Rth(j-a) = 230 K/W, Rth(j-sp) = 55 K/W) are validated only under reflow conditions on FR4 with specified pad geometry.
What is the maximum continuous forward current for BAS21J-Q?
The device has no specified continuous DC forward current rating. Its limiting value is pulsed forward current: IF = 250 mA (tp ≤ 300 µs, duty cycle δ ≤ 0.02). For sustained operation, thermal design must ensure junction temperature stays ≤150 °C using Ptot = 550 mW and Rth(j-a) = 230 K/W on standard FR4.
Does BAS21J-Q have a marked cathode indicator?
Yes - the device uses "AN" as its marking code per Table 4, applied adjacent to the cathode (pin 1) on the SOD323F package. This aligns with the simplified outline in Figure 6, where pin 1 is designated K (cathode) and pin 2 is A (anode).
How does BAS21J-Q perform at elevated junction temperatures?
At Tj = 150 °C, reverse current increases to ≤50 µA (vs. ≤150 nA at 25 °C), and forward voltage decreases slightly. The device remains fully functional within its 150 °C max junction rating, and all parameters in Tables 5–7 include temperature-dependent curves confirming operational stability across the full −65 °C to +150 °C range.
BAS21J-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 250mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 150 nA @ 250 V
- Capacitance @ Vr, F:
- 2pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
- Operating Temperature - Junction:
- 150°C
BAS21J-QX FAQ
1.How can I place an order for BAS21J-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21J-QX 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 BAS21J-QX reliable?
The price and inventory of BAS21J-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21J-QX is usually 5 days.
3.What payment methods are accepted for BAS21J-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21J-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21J-QX?
BAS21J-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21J-QX 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 BAS21J-QX?
For technical support, including BAS21J-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21J-QX requirements.
6.How does Aetrix verify that BAS21J-QX is sourced from the original manufacturer or authorized distributors?
All BAS21J-QX 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 BAS21J-QX meets industry standards.
7.What is the process for return or replacement of BAS21J-QX?
All BAS21J-QX units undergo pre-shipment inspection (PSI). If there is an issue with BAS21J-QX, 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 BAS21J-QX part is unused and in its original packaging.
Return procedure for BAS21J-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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