BAT46WQ-7-F - 100V 150mA Schottky Diode SOD-123 | Diodes Inc.
MPN: BAT46WQ-7-F ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.15 | $0.15 |
| 10 | $0.12 | $1.20 |
| 50 | $0.095 | $4.75 |
| 150 | $0.084 | $12.60 |
| 500 | $0.075 | $37.50 |
| 1,000 | $0.068 | $68.00 |
Drop-in alternatives for BAT46WQ-7-F — 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:
BAT46W-7-F
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BAT46WH
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.029 / Unit
View Datasheet →BAT46WJ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.024 / Unit
View Datasheet →BAT46WJ-QX
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.065 / Unit
View Datasheet →BAT46W-HE3-08
✅ Drop-In📋 Reference alternative (not in catalog)
BAT46WQ-7-F Maximum Ratings & Electrical Characteristics
| Product Type | Schottky Barrier Diode |
| Reverse Voltage (Vr) | 100 V |
| Average Forward Current (If) | 150 mA |
| Forward Voltage (Vf) | 1.0 V |
| Reverse Current (Ir) | 2.0 uA |
| Configuration | Single Diode |
| Package | SOD-123 (SOD123-2) |
| Mounting Style | SMD/SMT |
| Automotive Qualification | AEC-Q101 qualified |
| Transient Protection | Guard ring construction |
| Turn-On Voltage | Low turn-on voltage (Schottky) |
| RoHS Status | Compliant (EU 2002/95/EC and 2011/65/EU) |
| Halogen Free | Yes (halogen and antimony free) |
| Lead Free | Yes (totally lead-free) |
| Packaging Suffix | -7-F (tape and reel, lead-free) |
BAT46WQ-7-F Pin Configuration
| Pin 1 | Cathode — Cathode terminal (marked by band on package body) |
| Pin 2 | 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
BAT46WQ-7-F is suitable for 6 applications: Automotive Polarity Protection, Re-Circulating (Freewheeling) Diode for Relays and Inductive Loads, High-Speed Switching and Signal Clamping, Industrial 24V/48V Bus Input Rectification, Battery-Powered and Portable Device Protection, Test and Measurement Instrumentation.
Automotive Polarity Protection
The BAT46WQ-7-F is purpose-built for reverse-battery and polarity protection in 12V and 24V automotive systems. Its AEC-Q101 qualification, achieved through the WQ automotive-compliant variant, provides the reliability documentation demanded by vehicle ECUs. The 100V reverse voltage rating offers wide margin above automotive load-dump transients when combined with the guard ring construction for transient protection, while the low Schottky turn-on voltage minimizes series voltage drop and power loss in the supply path. Placed in series with the module input rail, the diode blocks reverse connection at a forward drop near 1.0V at rated 150mA current, far less loss than would occur with repeated fuse replacement. Designers should verify total power dissipation at peak load currents and provide adequate SOD-123 pad copper for thermal relief.
Recommended
Re-Circulating (Freewheeling) Diode for Relays and Inductive Loads
When a relay coil, solenoid, or small inductor is switched off, the collapsing magnetic field produces a reverse-voltage spike that can destroy the driving transistor. The BAT46WQ-7-F is explicitly listed by Diodes Incorporated as a re-circulating diode application. Connected in reverse parallel across the coil, it clamps the inductive kick and recirculates stored energy. The Schottky topology provides fast recovery with no reverse-recovery charge, which matters in high-frequency switching or PWM-driven loads where a slow P-N diode would extend switching transitions and add loss. The 100V rating comfortably covers 12V, 24V, and 48V coil systems, and the 150mA rating suits small relays and signal-level inductors. For coils carrying more current, parallel devices or a larger rectifier should be evaluated.
Recommended
High-Speed Switching and Signal Clamping
With low turn-on voltage and no reverse-recovery charge, the BAT46WQ-7-F functions as a fast switching diode for waveform clamping, OR-ing logic rails, and detecting signals in instrumentation front ends. The 100V breakdown - unusually high for the small-signal Schottky class, where competitors in SOD-123 typically stop at 30V-40V - allows it to sit on higher-voltage signal lines without avalanche risk, and the guard ring construction adds transient robustness. The approximately 1.0V forward voltage at rated current and 2.0uA reverse current keep leakage acceptable in precision sampling circuits, though designers should verify leakage at maximum junction temperature in ultra-low-power designs. Its SOD-123 footprint also reflows on standard high-volume SMT lines without special handling.
Recommended
Industrial 24V/48V Bus Input Rectification
Industrial control panels, PLC I/O modules, and factory sensors commonly run from 24V or increasingly 48V rails. The BAT46WQ-7-F's 100V rating provides more than 2x margin over a 48V bus, unlike 40V-class small-signal Schottkys that leave no headroom. Used at the input of an I/O channel for polarity protection or low-power auxiliary rectification, the diode handles 150mA continuous with roughly 150mW of conduction loss at the 1.0V typical forward voltage - easily managed by the SOD-123 package on a standard PCB pad. AEC-Q101 grade derived from its automotive variant also raises general industrial reliability confidence. For higher-current input bridges, pair it with a larger Schottky rectifier and reserve the BAT46WQ-7-F for the low-power signal path.
Recommended
Battery-Powered and Portable Device Protection
In battery-operated meters, wearables, and handheld instruments, a series protection diode must combine low forward drop (to preserve battery life) with very low reverse leakage (to prevent drain when the diode is reverse biased). The BAT46WQ-7-F offers a low Schottky turn-on voltage and a 2.0uA reverse current spec, which is acceptable for most portable designs, though deep-sleep battery budgets below 1uA total may require a lower-leakage alternative. The 100V rating also protects input circuitry from accidental connection to higher-voltage chargers or adapters. Its lead-free, halogen-free Green Device status supports consumer environmental compliance, and the compact SOD-123 footprint fits dense portable PCBs. Thermal design is simple at the 150mA maximum, typically requiring no special copper area.
Recommended
Test and Measurement Instrumentation
Bench instruments, probes, and data-acquisition front ends use small-signal Schottky diodes for input overvoltage clamping, precision rectification, and detector circuits. The BAT46WQ-7-F suits these roles because its 100V reverse rating tolerates accidental connection of inputs to higher-voltage sources, and guard ring construction improves surge survival. The fast Schottky switching action supports accurate envelope detection up to moderate frequencies without reverse-recovery distortion. At 1.0V typical forward voltage, it clamps above the signal range of low-voltage ADC inputs, protecting the converter while remaining out of the measurement band. Instruments also benefit from the AEC-Q101-grade manufacturing of the WQ variant, which provides tighter process control than standard commercial discrete diode lines.
Recommended
Recommended Products Summary
Engineering reference data for BAT46WQ-7-F — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAT46W-7-F | BAT46WH | BAT46WJ | BAT46W-HE3-08 |
|---|---|---|---|---|---|
| Package | SOD-123 | SOD-123 - same | SOD-123 - same | SOD-123 - same | SOD-123 - same |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Vishay Intertechnology |
| Reverse Voltage | 100 V | 100 V | 100 V | 100 V | 100 V |
| Forward Current | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA |
| Forward Voltage | 1.0 V | 1.0 V | 1.0 V | [DATA_NEEDED] | 1.0 V (at 250 mA spec point) |
| AEC-Q101 Qualification | Yes | No (standard part) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| RoHS / Lead-Free | Yes (RoHS 2, Green Device) | Yes | Yes | Yes | Yes |
| Unit Price (qty 500) | $0.075 (as of 2026-09-13) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- AEC-Q101 automotive qualification (vs BAT46W-7-F)
- High 100V breakdown for the small-signal class (vs BAT46W-HE3-08)
- Trade-off: higher Vf than low-barrier Schottkys (vs 1N5711WS-7-F)
Design Notes
Estimated: at the 150mA maximum rating with a typical 1.0V forward voltage, conduction dissipation is about 150mW, which the SOD-123 package handles on a standard footprint. However, at elevated ambient temperatures the forward current must be derated per the datasheet derating curve, and Schottky reverse leakage rises roughly exponentially with junction temperature - in a sealed automotive module at 105C ambient, verify leakage remains acceptable in low-power circuits. For re-circulating duty across relay coils, average current (not peak coil current) governs sizing.
The SOD-123 footprint is standardized; place the diode close to the protected node (relay coil or input connector) so the clamp loop inductance stays low during fast transients. Use the band-marked end as pin 1 (cathode) - reversed installation in a polarity-protection role will short the supply. For reflow assembly, SOD-123 is MSL-insensitive, but storage per JEDEC moisture guidelines is still recommended for long shelf-life reels.
Do not substitute a generic 30V-40V small-signal Schottky (common in SOD-123) where the 100V rating is required - many same-package competitors avalanche on 24V/48V bus transients. Also confirm qualification grade: only the WQ variant (this part) carries AEC-Q101 per the Diodes datasheet; the standard BAT46W does not. When sourcing from the open market, the -F suffix confirms the totally lead-free version; older stock without -F may not be RoHS compliant.
Compliance Information
Per Diodes Incorporated datasheet: no purposely added lead, fully compliant with EU Directive 2002/95/EC (RoHS) and 2011/65/EU (RoHS 2), halogen and antimony free, Green Device. AEC-Q101 qualified (automotive discrete standard; AEC-Q100 is for ICs). REACH status not stated in provided data.
