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Nexperia USA Inc. BAS21J-QF
- Part No.:
- BAS21J-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
BAS21J-QF.pdf
- Description:
- BAS21J-Q/SOD323F/SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:7,302
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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 - enabling fast transient response in automotive clamping and polarity protection circuits.
For engineers reviewing the BAS21J-Q datasheet, BAS21J-Q pinout, BAS21J-Q application, or BAS21J-Q equivalent, key selection criteria include verified AEC-Q101 qualification, low-leakage performance at 150 °C junction temperature, thermal resistance of 55 K/W to solder point, and compatibility with reflow-only assembly on FR4 PCBs.
Technical Context
This discrete silicon switching diode operates as a unidirectional current path with cathode-anode polarity, optimized for high-frequency turn-off via low stored charge and minimal minority carrier lifetime. Its 300 V VRRM and 150 nA IR at 250 V/25 °C support robust voltage hold-off in transient-prone environments.
The device's 2 pF capacitance at 0 V bias and 50 ns trr under defined test conditions (IF = IR = 30 mA, RL = 100 Ω) enable sub-20 MHz switching without significant capacitive loading or reverse conduction lag - critical for ESD clamp staging and flyback snubbing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - supports clamping of transients up to ISO 7637-2 Pulse 1/2a in 12 V automotive systems without breakdown |
| trr | 50 ns - ensures clean turn-off within 20 MHz clocked signal paths, minimizing shoot-through risk in half-bridge gate drive protection |
| Cd | 2 pF at 0 V, 1 MHz - reduces high-frequency signal distortion in RF detector or antenna tuning applications |
| IR | 150 nA at 250 V, 25 °C - maintains low standby power loss in always-on reverse-polarity protection circuits |
| Ptot | 550 mW at Tamb ≤ 25 °C - enables operation at full forward current (250 mA pulsed) on standard FR4 with 1 cm² cathode pad |
| Rth(j-sp) | 55 K/W - allows direct thermal coupling to PCB copper, supporting junction temperatures up to 150 °C during transient surges |
Pinout & Package
Package: SOD323F (SC-90), surface-mounted plastic package measuring 1.7 mm × 1.25 mm × 0.7 mm with flat leads and excellent coplanarity for reliable reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to higher-potential node in reverse-biased clamping; serves as primary thermal interface to PCB copper pour |
| 2 | Anode (A) | Connected to lower-potential node; carries forward current during conduction; electrically isolated from thermal path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114 |
| Low trr with controlled tail | 50 ns trr measured with IR(meas) = 3 mA ensures predictable turn-off timing in synchronous rectifier auxiliary paths |
| Thermally enhanced SOD323F | 55 K/W Rth(j-sp) enables >10× longer surge survivability vs. standard SOD323 under IFSM = 14.1 A pulses |
| Low leakage at high Tj | 50 µA IR at VR = 300 V and Tj = 150 °C maintains functional integrity in under-hood engine control modules |
Applications
| Automotive Load Dump Clamping | USB Port Reverse Polarity Protection |
|---|---|
Use Scenario: Suppresses 120 V transients induced by alternator load dump in body control modules. IC Role / Device Role / Timing Role: Fast-switching diode placed across supply rail to shunt energy into bulk capacitance before LDO input. Use Value: 300 V VRRM and 50 ns trr prevent avalanche delay-induced overvoltage failure during ISO 7637-2 Pulse 5a events. |
Use Scenario: Blocks reverse current when external 5 V supply is connected backward to USB VBUS line. IC Role / Device Role / Timing Role: Series anode-cathode configuration between connector and downstream PMIC input. Use Value: 150 nA IR at 250 V minimizes quiescent drain in battery-backed portable devices; SOD323F footprint fits tight USB-C layout constraints. |
| High-Speed Signal Line Clamping | DC-DC Converter Bootstrap Diode |
Use Scenario: Limits overshoot on CAN FD or LIN bus lines during ESD events per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Bidirectional TVS replacement in low-capacitance clamping network with series resistor. Use Value: 2 pF Cd avoids signal edge degradation above 100 Mbps; 300 V standoff prevents false triggering during normal operation. |
Use Scenario: Charges bootstrap capacitor in high-side N-channel MOSFET gate drivers for buck converters. IC Role / Device Role / Timing Role: Anode tied to switch node, cathode to bootstrap capacitor - conducts only during low-side FET on-time. Use Value: 50 ns trr ensures full capacitor recharge before next high-side switching cycle at 2 MHz; 250 mA pulsed rating handles 100 ns charge pulses. |
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 diode in SOT363; shared cathode; 300 V VRRM, 50 ns trr, but 3.5 pF Cd | Requires dual-path clamping or matched pair routing; higher capacitance limits >50 MHz use | Select when space-constrained layouts need two identical diodes sharing thermal mass and footprint |
| 1N4148W | 300 V VRRM, 4 ns trr, but not AEC-Q101 qualified; SOD-123 package; 4 pF Cd | Lacks automotive qualification and thermal robustness; unsuitable for under-hood deployment | Prefer for cost-sensitive consumer electronics where AEC-Q101 is not mandated and faster trr is critical |
Compared with BAS21DW-Q and 1N4148W, the BAS21J-Q uniquely balances automotive qualification, ultra-low capacitance, and thermally optimized SOD323F packaging - making it the only choice for space-limited, high-reliability 12 V system clamping where both AEC compliance and <3 pF loading are mandatory.
Availability
BAS21J-Q is available at Aetrix Electronics and suitable for automotive load dump clamping, USB reverse polarity protection, and high-speed signal line clamping requiring stable component supply across production lifecycles.
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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The BAS21J-Q belongs to Nexperia's AEC-Q101-qualified high-speed diode product line, engineered specifically for automotive power rail protection, ESD suppression, and compact DC-DC auxiliary functions where thermal resilience and fast switching are non-negotiable.
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 supported due to thermal stress limitations of the SOD323F package and internal die attach. Reflow profile must comply with JEDEC J-STD-020, peak temperature ≤ 260 °C, and time above 217 °C limited to 60–150 seconds.
What is the maximum continuous forward current for BAS21J-Q?
The device has no specified continuous (DC) forward current rating. Its IF rating is pulsed: 250 mA maximum with pulse width ≤ 300 µs and duty cycle ≤ 2 %. For sustained conduction, thermal design must limit junction temperature to 150 °C using Rth(j-a) = 230 K/W or Rth(j-sp) = 55 K/W, depending on PCB layout and copper area.
Does BAS21J-Q have a marked cathode indicator?
Yes - the device uses "AN" as its marking code per Table 4, located adjacent to the cathode (pin 1) on the top surface. The cathode end is also denoted by a beveled edge on the SOD323F package outline per Figure 6, confirming physical polarity alignment with the marking.
Can BAS21J-Q replace BAS21 in existing designs?
No - although both share 300 V VRRM and similar trr, the BAS21J-Q is AEC-Q101 qualified and packaged in SOD323F (1.7 × 1.25 mm), whereas BAS21 uses DO-35 (4.5 × 2.5 mm). Footprint, thermal behavior, and automotive qualification differ significantly; redesign and validation are required for migration.
BAS21J-QF 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-QF FAQ
1.How can I place an order for BAS21J-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21J-QF 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-QF reliable?
The price and inventory of BAS21J-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21J-QF is usually 5 days.
3.What payment methods are accepted for BAS21J-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21J-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21J-QF?
BAS21J-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21J-QF 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-QF?
For technical support, including BAS21J-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21J-QF requirements.
6.How does Aetrix verify that BAS21J-QF is sourced from the original manufacturer or authorized distributors?
All BAS21J-QF 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-QF meets industry standards.
7.What is the process for return or replacement of BAS21J-QF?
All BAS21J-QF units undergo pre-shipment inspection (PSI). If there is an issue with BAS21J-QF, 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-QF part is unused and in its original packaging.
Return procedure for BAS21J-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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