BAT46WJ-QX - 100V 250mA Schottky Diode SOD-323F | Nexperia
MPN: BAT46WJ-QX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.12 | $0.12 |
| 10 | $0.1 | $1.00 |
| 100 | $0.085 | $8.50 |
| 500 | $0.075 | $37.50 |
| 1,000 | $0.065 | $65.00 |
Drop-in alternatives for BAT46WJ-QX — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BAT46WJ,115
✅ Drop-In📋 Reference alternative (not in catalog)
BAT46WJ-Q
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View Datasheet →BAT46WH
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View Datasheet →BAT46WH
✅ Drop-In✓ In Stock
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View Datasheet →BAT46WH
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View Datasheet →1N6263W-7
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View Datasheet →BAT46WJ-QX Maximum Ratings & Electrical Characteristics
| Diode Type | Schottky barrier diode |
| Repetitive Peak Reverse Voltage (VRRM) | 100 V |
| Average Forward Current (IF(AV)) | 250 mA |
| Configuration | Single diode |
| Technology | Planar Schottky with integrated guard ring |
| Package | SOD323F (SC-90) |
| Mounting Type | Surface Mount |
| Product Grade | Automotive qualified Q-variant |
| Termination Style | 2-terminal, flat lead SMD |
| Qualification | AEC-Q qualified (Q-variant per Nexperia) |
| RoHS Status | Compliant |
| Lead Free | Yes |
| Applications | Polarity protection, re-circulating diode, switching diode |
BAT46WJ-QX Pin Configuration
| Pin 1 | K (Cathode) — Cathode terminal, marked by the polarity band on the package body |
| Pin 2 | A (Anode) — Anode terminal |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
BAT46WJ-QX is suitable for 6 applications: Reverse Polarity Protection, Freewheeling / Re-circulating Diode, High-Speed Switching and Clamping, Automotive Board-Net Protection, Portable and Battery-Powered Devices, Low-Power DC-DC Converter Rectification.
Reverse Polarity Protection
The BAT46WJ-QX excels as a series or shunt reverse-polarity protection diode because its Schottky junction introduces a low forward voltage drop, preserving precious voltage headroom in battery-powered and low-voltage systems. In a series configuration, the 250 mA forward current rating covers typical portable electronics, sensor nodes, and automotive low-power rails, while the 100 V reverse rating withstands severe mis-wiring and inductive kick events that would destroy lower-voltage small-signal Schottky diodes. Placed in series with the supply input, the diode blocks reverse connection with minimal power loss; in a shunt Crowbar arrangement, it clamps negative transients. The integrated guard ring improves robustness against surge stress during fault events, and the Q-variant grading supports automotive board-net requirements.
Recommended
Freewheeling / Re-circulating Diode
In low-power inductive loads - relays, small solenoids, and DC fan coils - the BAT46WJ-QX serves as the freewheeling diode that recirculates coil current at switch-off. Because a Schottky junction has no reverse-recovery charge, clamping begins essentially instantly, reducing voltage overshoot at the switching transistor and cutting EMI. The 250 mA average current rating suits relay coils in the tens of mA to low hundreds of mA range, and the 100 V reverse voltage provides ample margin against the counter-EMF spike on 12 V and 24 V automotive and industrial rails. The compact SOD323F body allows placement directly at the coil terminals, minimizing the loop area that governs radiated emissions during the recirculation interval.
Recommended
High-Speed Switching and Clamping
The BAT46WJ-QX is well suited as a switching diode in signal steering, clamping, and OR-ing circuits operating at frequencies where P-N junction diode recovery time would dominate losses. Since Schottky devices conduct by majority carriers, there is no reverse-recovery interval, enabling clean transitions in logic-level rectification, sample-hold clamps, and detector circuits. The 100 V rating permits use in clamps on higher-voltage rails than most small-signal Schottky diodes of this size allow. In detector or envelope-detection roles, low junction capacitance and low forward drop improve sensitivity at small signal amplitudes. Guard-ring construction stabilizes leakage and breakdown behavior across temperature, which matters for precision clamp thresholds in measurement front ends.
Recommended
Automotive Board-Net Protection
The QX suffix identifies BAT46WJ-QX as part of Nexperia's automotive-qualified Q-variant family, making it appropriate for load-dump-adjacent, reverse-battery, and module-level protection functions in vehicle ECUs and body electronics. The 100 V repetitive reverse rating provides margin against the transient environment of a 12 V board net, while the 250 mA rating covers sensor supplies, actuator logic rails, and communication-line bias circuits. The integrated guard ring enhances robustness against the surge and ESD stress defined in automotive qualification programs. Designers should still follow module-level suppression strategy - this diode complements, not replaces, TVS devices for load dump. PPAP and IMDS documentation are available through Nexperia automotive sales channels.
Recommended
Portable and Battery-Powered Devices
In wearables, metering dongles, and handheld instruments, every 100 mV of diode drop reduces usable battery energy, so the BAT46WJ-QX low forward voltage characteristic directly extends operating time in series-protection positions. The very small and flat SOD323F package - approximately 1.7 mm x 1.3 mm body with low profile - fits the dense, height-constrained layouts typical of portable products and supports standard lead-free reflow assembly. The 250 mA rating covers charging and power-path circuits of small cells, while the 100 V reverse rating gives unusual headroom for a part this size, protecting against adapter transients and connector mis-mating events. Guard-ring construction keeps reverse leakage stable, an important consideration in microamp sleep-current budgets.
Recommended
Low-Power DC-DC Converter Rectification
The BAT46WJ-QX functions as an output or freewheeling rectifier in low-power non-isolated DC-DC converters - buck, boost, and charge-pump stages - where switching frequency and efficiency depend on eliminating reverse-recovery loss. With 250 mA average forward current, it serves converter outputs in the hundreds of milliamps typical of sensor, display, and wireless-module rails, and the 100 V rating supports boost outputs and 24 V industrial inputs with margin. The flat-lead SOD323F package minimizes parasitic inductance in the hot loop compared with longer-lead packages, reducing switching-rail ringing and associated EMI. Verify thermal behavior at maximum duty cycle using the datasheet forward-characteristic curves, and keep the diode adjacent to the switch node for minimal loop area.
Recommended
Recommended Products Summary
Engineering reference data for BAT46WJ-QX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAT46WJ,115 | BAT46WJ-Q | BAT46WH | BAT46W (Diodes Inc.) | BAT46W (ST) |
|---|---|---|---|---|---|---|
| Package | SOD323F (SC-90) | SOD323F (SC-90) - same | SOD323F (SC-90) - same | SOD-323 | SOD-323 | SOD-323 type |
| Brand | Nexperia | Nexperia | Nexperia | Nexperia | Diodes Incorporated | STMicroelectronics |
| Reverse Voltage Rating | 100 V | 100 V | 100 V | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Forward Current | 250 mA | 250 mA | 250 mA | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Configuration | Single Schottky with guard ring | Single Schottky with guard ring | Single Schottky with guard ring | Single Schottky | Single Schottky | Single Schottky |
| Automotive Qualification | Yes (Q-variant) | No (standard grade) | Yes (Q-variant) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Approximate Unit Price (qty 1) | $0.12 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Typical Duty | Polarity protection, re-circulating, switching | Same duty | Same duty | Polarity protection, switching | Polarity protection, re-circulating, switching | Polarity protection, re-circulating, switching |
Key Differentiators
- Automotive Q-variant qualification (vs BAT46WJ,115)
- High 100 V reverse rating in a tiny package (vs BAT46WH)
- Integrated guard ring for stress protection (vs BAT46W (Diodes Incorporated))
Design Notes
Estimated: at 250 mA average forward current with a typical BAT46-family forward voltage in the sub-1 V range, diode dissipation is roughly 0.2 W or less; the SOD323F package with a modest PCB copper area handles this, but confirm junction temperature using the datasheet power dissipation derating versus ambient temperature. In continuous rectification duty rather than pulsed protection duty, verify worst-case dissipation at maximum ambient, not 25 C, and increase copper pad area if the junction approaches the datasheet limit.
Place the diode directly across the protected node or adjacent to the coil/switch terminal. In freewheeling duty, a short recirculation loop reduces radiated emissions; in polarity protection, keep series trace resistance low so the forward drop stays minimal. SOD323F flat leads suit standard reflow assembly - follow the Nexperia datasheet land-pattern and soldering-profile recommendations, and respect moisture sensitivity handling as marked on the reel label.
Do not confuse package suffixes when second-sourcing: SOD323F (flat lead, SC-90) and standard SOD-323 are similar but not dimensionally identical, so verify the land pattern before approving a cross-brand BAT46W substitution. Also confirm reverse leakage at maximum operating temperature for battery-powered designs - Schottky leakage rises significantly with temperature and can erode microamp sleep budgets. For automotive programs, the QX variant requires PPAP documentation; the standard BAT46WJ does not carry it.
Compliance Information
QX suffix denotes Nexperia automotive-qualified Q-variant family. RoHS and lead-free status per Nexperia product page and DigiKey listing; REACH and halogen-free status should be confirmed from the current Nexperia compliance certificate.
