BAT46X - 100V 150mA Schottky Diode SOD-523 | R+O
MPN: BAT46X ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.015 | $0.02 |
| 10 | $0.014 | $0.14 |
| 100 | $0.012 | $1.20 |
| 500 | $0.01 | $5.00 |
| 1,000 | $0.008 | $8.00 |
Drop-in alternatives for BAT46X — 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:
BAT46X-TP
✅ Drop-In📋 Reference alternative (not in catalog)
BAT46X
✅ Drop-In✓ In Stock
$0.008 / Unit
View Datasheet →BAT46X
✅ Drop-In✓ In Stock
$0.008 / Unit
View Datasheet →BAT46X Maximum Ratings & Electrical Characteristics
| Diode Type | Schottky barrier diode |
| Repetitive Peak Reverse Voltage (VRRM) | 100 V |
| Average Forward Current (IF(AV)) | 150 mA |
| Forward Current (DigiKey listing, GOODWORK BAT46X) | 150 mA |
| Forward Current (MCC BAT46X-TP listing) | 200 mA |
| Package | SOD-523 (SC-79, 2-pin) |
| Mounting Type | Surface Mount |
| Configuration | Single diode |
| Packaging | Tape & Reel (per DigiKey/LCSC listings) |
BAT46X Pin Configuration
| Pin 1 | Cathode — Cathode terminal, identified by the polarity bar/mark on the SOD-523 package top |
| Pin 2 | Anode — Anode terminal (unmarked end of the SOD-523 package) |
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
BAT46X is suitable for 6 applications: Reverse-Polarity Battery Protection, Power Rail ORing, RF Detection and Clamping, Low-Current DC-DC Converter Rectification, Logic-Level and Signal Line Protection, Metering and Test Instrument Protection.
Reverse-Polarity Battery Protection
The BAT46X fits battery-input protection circuits in portable and IoT devices because its 100 V reverse rating far exceeds typical 1S-4S battery voltages while the SOD-523 package occupies minimal board area. In a series protection position, the Schottky conducts only in the correct polarity and blocks reverse hookup; its low forward drop class (roughly 0.2-0.45 V typical for small-signal Schottky) wastes far less power than a silicon rectifier, extending battery life. Placed directly after the battery connector with a ceramic input capacitor, it also blocks reversed chargers. Verify your load current stays under the 150 mA rating (200 mA if using the MCC BAT46X-TP second source) and derate for hot enclosures.
Recommended
Power Rail ORing
For ORing two low-current supply rails - for example a coin cell backup with a main DC input - the BAT46X is a natural fit because its Schottky junction provides a low forward drop and the 100 V rating tolerates wide rail combinations. Each diode is wired from its source to the common rail; the higher voltage source conducts while the other is reverse-biased, giving automatic, lossless-within-class source selection with no controller needed. At the 150 mA rating, conduction loss stays in the tens-of-milliwatts range at typical Schottky forward voltage. Place each diode close to its source pin and confirm the common-rail voltage never approaches the 100 V limit, including transients.
Recommended
RF Detection and Clamping
Schottky barrier diodes such as the BAT46X are the standard choice for RF detection, video clamping, and signal-steering circuits because the metal-semiconductor junction has essentially zero reverse-recovery charge, allowing the diode to follow high-frequency envelope changes that a P-N junction cannot. The STMicroelectronics BAT46 family page explicitly positions these diodes for protection and routing operations. In a detector, the BAT46X rectifies the RF envelope into a holding capacitor; in a clamp, it limits signal excursions at a reference node. The SOD-523 package minimizes parasitic inductance at the pads. Confirm junction capacitance from the manufacturer datasheet when the application operates near the diode's self-resonant region.
Recommended
Low-Current DC-DC Converter Rectification
In low-power buck, boost, or flyback converters operating below a few hundred milliamps, the BAT46X can serve as the output or freewheeling rectifier. Its near-zero reverse recovery eliminates the turn-on loss spike a P-N rectifier would impose on the switching transistor, improving efficiency at high switching frequency, while the 100 V rating covers boost converters stepping from 5 V to 24 V or 48 V buses with margin. Losses are dominated by the forward drop times average current, so at 100 mA the conduction loss stays on the order of tens of milliwatts in a SOD-523 thermal envelope. Verify peak repetitive reverse voltage including ringing and consider snubbing if it approaches 100 V.
Recommended
Logic-Level and Signal Line Protection
The BAT46X protects logic inputs, sensor lines, and communication buses against negative and over-voltage excursions. Wired from ground to the protected node, it clamps negative undershoot to one Schottky forward drop - lower than a silicon diode can achieve - preventing substrate injection and input-stage damage. The 100 V rating lets the same part also guard against high-voltage transient events on industrial interfaces without approaching breakdown. The tiny SOD-523 footprint allows placement directly at connector or IC pins, minimizing the loop area that limits high-frequency clamp effectiveness. Keep series impedance between the line and the diode adequate so fault current stays far below the 150 mA rating during sustained overvoltage events.
Recommended
Metering and Test Instrument Protection
Multimeter probes, bench accessories, and sensor front ends benefit from a compact input clamp, and the BAT46X in SOD-523 fits beside the input jack where board space is scarce. Its 100 V reverse rating survives accidental connection to moderate supply rails, while the Schottky low forward drop limits clamp voltage at the sensitive front end. The BAT46 family is described by ST as 'high voltage, small signal Schottky diodes suited for protection and routing operations,' which matches this use case directly. For instrument inputs, check leakage current at operating temperature since Schottky leakage rises with temperature and can affect high-impedance measurement accuracy; consult the manufacturer datasheet IR specification.
Recommended
Recommended Products Summary
Engineering reference data for BAT46X — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAT46X-TP | BAT46X (R+O) | BAT46X (GOODWORK) |
|---|---|---|---|---|
| Package | SOD-523 | SOD-523 - same | SOD-523 - same | SOD-523 - same |
| Brand | R+O / multi-source | MCC (Micro Commercial Components) | R+O | GOODWORK |
| Reverse Voltage (VRRM) | 100 V | 100 V | 100 V | 100 V |
| Forward Current | 150 mA | 200 mA | 150 mA | 150 mA |
| Diode Technology | Schottky barrier | Schottky barrier | Schottky barrier | Schottky barrier |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Unit Price (qty 1) | $0.015 (as of 2026-09-13) | [DATA_NEEDED] | $0.015 (LCSC, as of 2026-09-13) | [DATA_NEEDED] |
| Configuration | Single diode | Single diode | Single diode | Single diode |
Key Differentiators
- 100 V reverse rating in an ultra-small package (vs Generic lower-voltage small-signal Schottky (BAT41 class))
- Higher current second source available drop-in (vs BAT46X-TP (MCC))
- Trade-off: smaller than SOD-123 family members but not footprint-compatible (vs BAT46W)
Design Notes
Verify polarity marking orientation before assembly. The SOD-523 package identifies the cathode with a printed bar, and because the package is roughly 1.2 x 0.8 mm, reversed placement is a frequent defect in high-volume SMT lines. Add automated optical inspection (AOI) polarity checks, and confirm the target manufacturer datasheet for its exact marking convention, since second sources (R+O, MCC, Huixin, TECH PUBLIC) may differ subtly in marking style.
Respect the current rating versus ambient temperature. The R+O BAT46X is rated 150 mA while the MCC BAT46X-TP second source is rated 200 mA in the same SOD-523 outline. Estimated: at 100 mA and a typical small-signal Schottky forward drop near 0.3 V, conduction dissipation is about 30 mW, which is safe for the SOD-523 thermal envelope; at the full rating with higher VF, verify junction temperature using the manufacturer datasheet Rth value and derate in hot enclosures.
Keep the SOD-523 land pattern per IPC/manufacturer recommendation and place protection diodes as close as possible to the connector or IC pin being protected. Short traces minimize loop inductance, which is the dominant limit on high-frequency clamp effectiveness. For ORing or rectification duty, wide short traces reduce series resistance; two standard SOD-523 pads usually provide adequate copper area for the sub-100 mA currents this diode handles.
Compliance Information
Compliance data was not present in the retrieved web data. Consult the specific manufacturer (R+O, MCC, GOODWORK, TECH PUBLIC, Huixin) datasheet or distributor compliance certificate.
