BAT46W - 100V 150mA Schottky Barrier Diode SOD-123 | Diodes Inc
MPN: BAT46W ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.12 | $0.12 |
| 10 | $0.09 | $0.90 |
| 100 | $0.055 | $5.50 |
| 500 | $0.038 | $19.00 |
| 1,000 | $0.029 | $29.00 |
Drop-in alternatives for BAT46W — 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:
1N6263W-7
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View Datasheet →BAT46W-V
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BAT46W-TP
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BAT46W
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View Datasheet →BAT46W Maximum Ratings & Electrical Characteristics
| Device Type | Small Signal Schottky Barrier Diode |
| Reverse Voltage (VRRM) | 100 V |
| Average Forward Current (IF(AV)) | 150 mA |
| Power Dissipation | 200 mW |
| Junction | Metal-silicon Schottky with PN guard ring |
| Reverse Recovery | Negligible switching losses (majority carrier device) |
| Package | SOD-123 |
| Mounting Type | Surface Mount |
| Terminal Finish | Matte tin plated leads |
| Solderability | Solderable per MIL-STD-202, Method 208 |
| Operating Temperature Range | -65 C to +150 C (per junction temperature range) |
| RoHS Status | Totally Lead-Free & Fully RoHS Compliant |
| Halogen Free | Yes (halogen and antimony free, Green device) |
| Applications | Polarity protection, re-circulating diodes, switching diode |
| Automotive Variant | BAT46WQ (separate datasheet) |
BAT46W Pin Configuration
| Pin 1 | Cathode — Cathode terminal, marked by the band on the SOD-123 body |
| Pin 2 | Anode — Anode terminal, unmarked end of the SOD-123 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
BAT46W is suitable for 6 applications: Reverse Polarity Protection, Freewheeling (Re-circulating) Diode for Inductive Loads, High-Speed Switching and Logic Signal Circuits, Portable and Battery-Powered Equipment, Automotive Modules (via BAT46WQ), Test and Measurement Instrumentation.
Reverse Polarity Protection
The BAT46W fits reverse-polarity protection because its 100V reverse rating comfortably covers 12V, 24V and 48V battery buses with transient margin, while its Schottky junction adds only a small forward drop in series with the supply - far less loss than a silicon PN diode. According to Diodes Incorporated, polarity protection is a primary intended application of this part. In use, the diode is placed in series with the input rail so a reversed battery is blocked rather than shorted, or across the rail in crowbar fashion with a fuse. The design trade-off is conduction loss: at rated 150mA the Schottky drop still dissipates power, so for higher currents a P-FET protector is preferable, but for small-signal and low-power inputs the BAT46W offers the simplest, lowest-cost solution with guard-ring ESD robustness.
Recommended
Freewheeling (Re-circulating) Diode for Inductive Loads
Diodes Incorporated explicitly lists re-circulating diodes as a target application for the BAT46W. When a relay coil, solenoid or small DC motor is switched off, the collapsing magnetic field drives an inductive kickback that this diode clamps, protecting the driving transistor. Because the BAT46W is a majority-carrier Schottky, its reverse recovery is negligible, so clamp turn-on introduces essentially no switching loss or delay - a measurable advantage over standard-recovery 1N4148-class diodes in fast PWM switching. The 100V rating covers flyback spikes well above common 12V/24V coil supplies. The trade-off is current: clamp current must remain within the 150mA average rating, so larger relays need a bigger rectifier. Place the diode directly across the coil terminals to keep the clamping loop short.
Recommended
High-Speed Switching and Logic Signal Circuits
With very low turn-on voltage and essentially zero reverse-recovery charge, the BAT46W suits high-speed switching duties such as OR-ing supply rails, clamping logic nodes, steering signals, and demoard/wire-AND functions. Diodes Incorporated classifies it as a switching diode application. Compared with a standard PN switching diode, the Schottky's absence of stored charge eliminates the reverse-recovery transient that limits switching frequency, and its lower forward threshold reduces signal loss in low-voltage logic. The 100V rating gives generous margin on 5V to 48V nodes. Capacitance is that of a small-signal Schottky, so for RF detection circuits a lower-capacitance part such as the 1N5711 family may be preferable, but for general digital and power-path switching up to tens of MHz the BAT46W performs cleanly.
Recommended
Portable and Battery-Powered Equipment
In portable devices, every millivolt of series drop reduces usable battery life, which is why the BAT46W's low forward voltage and small SOD-123 footprint suit battery-input protection, charging-path steering and power-multiplexing in handheld instruments, meters and IoT nodes. The diode's 150mA rating covers typical small-battery electronics, and the 100V reverse rating protects against multi-cell and accidental higher-voltage adapters. The 'Green' halogen-free, lead-free construction aligns with consumer environmental requirements. Design consideration: at heavier load currents the Schottky drop still costs power, so parallel it only within derating rules or move to a FET-based ideal-diode circuit above roughly 100mA continuous. The tiny 0.01g package weight and reflow solderability suit high-volume automated assembly of portable products.
Recommended
Automotive Modules (via BAT46WQ)
For automotive subsystems - body-control relay drivers, sensor clusters and infotainment protection circuits - Diodes Incorporated offers the automotive-compliant BAT46WQ under a separate datasheet, sharing the SOD-123 outline and 100V-class Schottky behavior of the BAT46W. The BAT46W itself serves non-AEC industrial designs adjacent to automotive platforms, such as bench equipment and factory sensors. In automotive relay and actuator modules the freewheeling role is identical to the industrial case: clamp coil kickback with negligible recovery loss while the 100V rating absorbs load-dump-derived spikes on protected nodes. Engineers should select the Q-variant for any build requiring automotive qualification flows and use the standard BAT46W where commercial-grade parts are acceptable, preserving layout reuse between the two grades.
Recommended
Test and Measurement Instrumentation
Handheld multimeters, probe accessories and bench instruments use small-signal Schottky diodes for input clamping, rectification in AC converters and protection steering - all roles where the BAT46W's low forward drop improves accuracy at small signal levels and its 100V rating survives probe overloads. In precision RMS converters the Schottky's low threshold extends the usable dynamic range at the bottom of the scale compared with silicon PN diodes. Because measurement front ends can see unexpected transients, the guard-ring construction's ESD robustness is a practical reliability benefit. The SOD-123 package fits dense analog front-end layouts. For the lowest-leakage, lowest-capacitance detector positions, designers may substitute the 1N5711 family, but for clamp and protection nodes the BAT46W's higher voltage rating is the better fit.
Recommended
Recommended Products Summary
Engineering reference data for BAT46W — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAT46W-V | BAT46W-TP | BAT46W (Diotec) | BAR46AFILM |
|---|---|---|---|---|---|
| Package | SOD-123 | SOD-123 - same | SOD-123 - same | SOD-123F - verify pad geometry | SOD-123 - same |
| Brand | Diodes Incorporated | Vishay Intertechnology | MCC (Micro Commercial Components) | Diotec Semiconductor | STMicroelectronics |
| Reverse Voltage (VRRM) | 100 V | 100 V | 100 V | 100 V | 100 V |
| Forward Current | 150 mA | 150 mA class | 75 mA (per DigiKey listing) | 150 mA (0.15 A) | [DATA_NEEDED] |
| Device Technology | Metal-silicon Schottky with guard ring | Schottky with guard ring | Schottky | Schottky | Schottky (BAT46FILM family) |
| Power Dissipation | 200 mW | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| RoHS / Lead Free | Compliant / Lead free (Green) | RoHS compliant | RoHS compliant (-TP suffix) | RoHS compliant | RoHS compliant (FILM flow) |
| Primary Applications | Polarity protection, freewheeling, switching | General purpose, fast switching | General purpose Schottky | General purpose Schottky | Protection and routing operations |
Key Differentiators
- 100V reverse rating in a small-signal SOD-123 package (vs 1N5711WS-7-F)
- Higher forward current than the MCC listing (vs BAT46W-TP)
- Lower conduction loss than PN switching diodes (vs 1N4148W-7-F)
Design Notes
Package variants differ across the BAT46W supply chain: Diodes Inc. and Vishay specify SOD-123, while Diotec specifies SOD-123F and some vendors offer SOD-123FL. These outlines are similar but not identical in pad geometry and body height. Before second-sourcing in production, overlay the vendor mechanical drawings on your footprint and re-run solder-joint inspection. Also note the MCC BAT46W-TP is listed at 75mA versus 150mA for other vendors - derate accordingly when qualifying alternates.
Estimated: at the 150mA rated current and a typical Schottky forward voltage on the order of a few hundred millivolts, conduction loss is roughly 30-100 mW, well inside the 200mW package rating at 25C ambient. However, thermal derating applies at elevated ambient temperatures - consult the vendor derating curve. In freewheeling duty with PWM, average current (not peak) determines dissipation; size the diode so average clamp current stays below 150mA with margin.
In freewheeling and polarity-protection placements, keep the loop between the diode, the inductive element and the switch as short as possible. A large loop adds parasitic inductance that produces voltage spikes and ringing that the 100V rating may not fully absorb under fast switching. Place the BAT46W directly at the coil or motor terminals, use short wide traces, and add a small ceramic capacitor across sensitive supply nodes if ringing is observed on the bench.
Do not rely on Schottky forward voltage as a precise reference or clamp threshold: it varies significantly with current and temperature, and BAT46W vendors specify it only at defined test conditions. For ESD-sensitive exposed nodes, the guard-ring construction helps but does not replace a dedicated TVS diode. Finally, for builds requiring automotive qualification, use the BAT46WQ variant - the standard BAT46W is not the automotive-compliant document.
Compliance Information
Per Diodes Incorporated product page: Totally Lead-Free & Fully RoHS Compliant; halogen and antimony free ('Green' device). Automotive-compliant part available separately as BAT46WQ. Terminals matte tin plated, solderable per MIL-STD-202 Method 208. REACH and conflict-minerals status not stated in provided data.
