BAT46WJ-Q - 100V 250mA AEC-Q101 Schottky | Nexperia
MPN: BAT46WJ-Q ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.24 | $0.24 |
| 10 | $0.19 | $1.90 |
| 100 | $0.11 | $11.00 |
| 500 | $0.08 | $40.00 |
| 1,000 | $0.06 | $60.00 |
Drop-in alternatives for BAT46WJ-Q — 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
✅ Drop-In✓ In Stock
$0.024 / Unit
View Datasheet →BAT46WJ-QX
✅ Drop-In✓ In Stock
$0.065 / Unit
View Datasheet →BAT46WJ,115
✅ Drop-In📋 Reference alternative (not in catalog)
BAT46WQ-7-F
✅ Drop-In✓ In Stock
$0.068 / Unit
View Datasheet →BAR46AFILM
✅ Drop-In✓ In Stock
$0.032 / Unit
View Datasheet →BAT46WJ-Q Maximum Ratings & Electrical Characteristics
| Device Type | Planar Schottky barrier diode |
| Reverse Voltage (VRRM) | 100 V |
| Average Forward Current (IF(AV)) | 250 mA |
| Total Power Dissipation (Ptot) | 400 mW |
| Maximum Reverse Current (IR) | 4 uA |
| Guard Ring | Integrated, for stress protection |
| Qualification | AEC-Q101 qualified |
| Package | SOD323F (SC-90) SMD plastic |
| Mounting Type | Surface Mount |
| Configuration | Single diode |
| Mounting Technology | Surface-Mounted Device (SMD) |
| Typical Use | Polarity protection, re-circulating, switching diode |
BAT46WJ-Q Pin Configuration
| Pin 1 | A — Anode - Schottky metal-barrier terminal, current flows in |
| Pin 2 | K — Cathode - marked by polarity band on package body |
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-Q is suitable for 6 applications: Automotive Reverse Polarity Protection, Re-circulating (Freewheeling) Diode, High-Speed Switching Diode, Industrial Control Boards, Battery-Powered Portable Devices, Networking and Telecom Line Protection.
Automotive Reverse Polarity Protection
In automotive ECUs, the BAT46WJ-Q is placed in series or shunt with the battery input rail to block reverse-battery connection events. Its AEC-Q101 qualification provides the automotive reliability documentation required by OEM design rules, while the 100 V reverse rating gives wide margin above 12 V and 48 V vehicle networks, surviving inductive transients that would destroy lower-voltage Schottky diodes. The low forward voltage of the planar Schottky junction minimizes the series drop in series-protection topologies, reducing power loss at load currents up to 250 mA. Designers should verify reverse leakage of up to 4 uA against sleep-mode current budgets, since leakage roughly doubles every 10 C; near the 100 V rating in hot engine-bay environments this can become measurable and affect quiescent drain specifications.
Recommended
Re-circulating (Freewheeling) Diode
When driving relays, solenoids, or small DC motors from low-side transistors, the BAT46WJ-Q is placed anti-parallel to the inductive load to recirculate stored energy at turn-off. The planar Schottky structure has no reverse-recovery charge, so it begins conducting within nanoseconds of the switch opening, clamping the flyback spike and protecting the driver transistor. Its 100 V rating withstands repeated flyback events well above 12 V and 24 V coil supplies, and the integrated guard ring adds stress protection against repetitive transients. Because clamping current decays from the coil current value, ensure the 250 mA average rating covers the coil holding current and duty cycle. The compact SOD323F footprint lets the diode sit directly beside the relay driver pin, shortening the recirculation loop and reducing EMI radiation from the switching event.
Recommended
High-Speed Switching Diode
In signal routing, clipping, clamping, and logic-level switching circuits, the BAT46WJ-Q provides majority-carrier Schottky conduction that eliminates the reverse-recovery time of P-N switching diodes, enabling fast edge transitions in pulse and clock networks. The 100 V reverse voltage makes it usable where common small-signal Schottky diodes rated 20-40 V would avalanche, such as legacy industrial interfaces and automotive sensor lines carrying transients. The 400 mW dissipation rating supports continuous clipping of moderate-amplitude signals, and the flat-lead SOD323F package maintains low parasitic inductance for signal integrity at high frequencies. When selecting, compare junction capacitance with competing parts because Schottky capacitance affects high-frequency insertion loss; consult the Nexperia datasheet curves for capacitance versus reverse bias in your band of operation.
Recommended
Industrial Control Boards
On PLC I/O modules, sensor conditioning boards, and factory automation drivers, the BAT46WJ-Q serves as input protection, output clamping, and re-circulating diode across the 24 V industrial rail. The 100 V reverse rating provides the traditional 4x design margin engineers apply on 24 V systems, covering inductive spikes from long cable runs and relay coils. The AEC-Q101 qualification, while automotive-focused, signals a reliability grade exceeding standard consumer screening, which suits 24/7 industrial operation. Its low forward voltage reduces clamp losses in frequently-switching I/O channels, and the SOD323F footprint allows dense channel multiplexing on modern PCBs. For boards mixing consumer and industrial variants, the same footprint accepts the lower-cost standard-grade BAT46WJ, letting one layout serve both cost tiers with only a BOM change.
Recommended
Battery-Powered Portable Devices
In battery-operated products, the BAT46WJ-Q provides low-loss series blocking and load-switch ORing at the battery terminal, preventing damage from reversed battery insertion or charger faults. The Schottky low forward voltage directly extends battery life compared to standard silicon diodes, an important advantage where every millivolt of series drop wastes energy at loads approaching the 250 mA rating. Designers must account for the up-to-4 uA reverse leakage, which grows with temperature and can be significant against microamp sleep currents - in ultra-low-power designs, measure leakage at operating temperature or prefer a MOSFET-based ideal diode. The 100 V rating comfortably covers multi-cell lithium stacks and covers accidental charger transients. The tiny flat-lead SOD323F package fits the dense boards of wearables, meters, and handheld instruments.
Recommended
Networking and Telecom Line Protection
Telecom and networking equipment applies the BAT46WJ-Q as a clamp on line-interface circuits, PoE auxiliary sense paths, and 48 V backplane rails, where its 100 V reverse rating covers the nominal 48 V bus with margin for surge conditions. The fast Schottky switching protects sensitive PHY and controller inputs from fast transients that slower P-N diodes would pass through. The guard-ring structure improves robustness against repetitive stress events on lines exposed to ESD and cable-induced surges, complementing the system TVS strategy at the board level. In low-current signaling roles the forward voltage contributes negligible loss, while the 4 uA maximum leakage remains far below typical line-idle current budgets. The SOD323F footprint supports the dense port multiplexing typical of switch and router line cards.
Recommended
Recommended Products Summary
Engineering reference data for BAT46WJ-Q — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAT46WJ | BAT46WJ-QX | BAT46WQ-7-F | BAR46AFILM |
|---|---|---|---|---|---|
| Package | SOD323F (SC-90) | SOD323F (SC-90) - same | SOD323F (SC-90) - same | SOD323F - same | SOD-323F - same |
| Brand | Nexperia | Nexperia | Nexperia | Diodes Incorporated | STMicroelectronics |
| Reverse Voltage (VRRM) | 100 V | 100 V | 100 V | [DATA_NEEDED] | 100 V |
| Average Forward Current | 250 mA | 250 mA | 250 mA | [DATA_NEEDED] | [DATA_NEEDED] |
| Total Power Dissipation | 400 mW | 400 mW | 400 mW | [DATA_NEEDED] | [DATA_NEEDED] |
| Max Reverse Current (IR) | 4 uA | 4 uA | 4 uA | [DATA_NEEDED] | [DATA_NEEDED] |
| AEC-Q101 Automotive Qualification | Qualified | Not qualified | Qualified | [DATA_NEEDED] | [DATA_NEEDED] |
| Unit Price (qty 1, as of 2026-09-13) | $0.24 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- AEC-Q101 automotive qualification (vs BAT46WJ)
- High 100 V reverse rating in a tiny SOD323F package (vs BAT46WQ-7-F)
- Integrated guard ring stress protection (vs BAR46AFILM)
Design Notes
Reverse leakage grows exponentially with temperature: the 4 uA maximum reverse current is specified at rated conditions and can multiply several times at 100 C+ ambient or junction temperatures. In battery-powered designs with microamp sleep budgets, or where the diode sits near its 100 V reverse rating in hot environments, measure leakage at your actual operating corner rather than trusting the 25 C figure. Estimated: leakage approximately doubles per 10 C rise, so a 50 C rise can mean over 30x the nominal leakage.
The SOD323F flat-lead package requires accurate land pattern dimensions per the Nexperia datasheet footprint drawing; flat leads are less tolerant of oversized pads than gull-wing packages and can self-align poorly if pad geometry is wrong. Place the diode close to the protected node (relay coil, connector, or driver pin) to minimize the flyback or transient loop area, which reduces EMI. Verify cathode band orientation against the silkscreen during AOI - reversed polarity is the most common assembly defect for two-terminal diodes.
Rated 400 mW total dissipation, the SOD323F package relies on copper pour for heat spreading in continuous-conduction roles. Estimated: at 250 mA forward current and a typical Schottky forward voltage around 0.4 V, dissipation is roughly 100 mV-level losses of about 0.1 W - well within rating - but in freewheeling duty at high duty cycles or elevated ambient, derate using the datasheet power-dissipation-versus-temperature curve. Confirm the forward voltage from the full Nexperia product specification rather than the short datasheet for exact thermal budgeting.
Compliance Information
AEC-Q101 qualified per Nexperia product information (automotive Schottky barrier diode, -Q suffix). RoHS/REACH/lead-free status not stated in the provided web data - confirm on the Nexperia product page compliance section.
