BAR46AFILM - 100V 150mA Dual Schottky Diode Array | STMicroelectronics
MPN: BAR46AFILM β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.11 | $0.11 |
| 10 | $0.08 | $0.80 |
| 100 | $0.0641 | $6.41 |
| 500 | $0.05 | $25.00 |
| 1,000 | $0.04 | $40.00 |
| 3,000 | $0.032 | $96.00 |
Drop-in alternatives for BAR46AFILM β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BAT46AFILM
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
BAT54AFILM
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
BAR43AFILM
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
BAR46A
β Drop-Inπ Reference alternative (not in catalog)
BAR46AFILM Maximum Ratings & Electrical Characteristics
| Diode Configuration | 1 Pair Common Anode (Dual) |
| Diode Type | Schottky |
| Repetitive Reverse Voltage (VRRM) | 100 V |
| Forward Current (DC) | 150 mA |
| Forward Voltage (VF) | 450 mV |
| Maximum Operating Temperature | 150 C |
| Package | TO-236-3 / SC-59 / SOT-23-3 |
| Mounting Type | Surface Mount |
| Technology | Small Signal Schottky Barrier |
| Application | SLIC protection, telecommunications |
| Marking Code | A46 |
| Packaging Type | Tape & Reel |
| RoHS Status | Compliant |
| Reverse Recovery | None (Schottky majority-carrier device) |
BAR46AFILM Pin Configuration
| Pin 1 | A1 β Anode of diode 1 (cathode of diode 1 internally tied to pin 2 common anode) |
| Pin 2 | COMMON ANODE β Common anode of both diodes |
| Pin 3 | A2 β Anode of diode 2 (cathode of diode 2 internally tied to pin 2 common anode) |
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
BAR46AFILM is suitable for 6 applications: Telecom SLIC Protection, Reverse Polarity Protection on 24-48V Rails, High-Speed Freewheeling and Clamping, ORing of Dual Power Inputs, Precision Rectification in Signal Chains, Battery-Powered and Portable Electronics.
Telecom SLIC Protection
The BAR46AFILM was explicitly optimized for SLIC (Subscriber Line Interface Circuit) protection in telecommunication equipment, per distributor application data. Ring and battery feed voltages in PSTN line cards can approach 90 V peak, and the 100 V repetitive reverse rating of this array provides the headroom that lower-voltage Schottky arrays such as the BAT54 (30 V) cannot tolerate. The dual common-anode configuration protects two line terminals with a single SOT-23 footprint, halving board area versus two discrete diodes. Placed from the line terminals to the SLIC bias rails, the Schottky junction clamps transients without the reverse-recovery time of PN diodes, preserving line signal integrity. Verify leakage at card operating temperature, since the 100 V rating carries higher leakage than lower-voltage arrays.
Recommended
Reverse Polarity Protection on 24-48V Rails
The 100 V reverse rating of the BAR46AFILM makes it suitable for reverse-polarity and battery-protection duties on industrial 24 V and telecom 48 V rails, where standard 30-45 V Schottky arrays would be over-stressed during transients. In a typical arrangement, one diode of the array is placed in series with the supply input; its 450 mV forward voltage wastes far less power than a silicon PN diode dropping 0.7-1.0 V, an important advantage at higher load currents. The second diode in the same package is available for output clamping or a second rail, reducing component count. Designers should estimate dissipation as load current times 450 mV and confirm the SOT-23 thermal rise stays within limits on their copper area.
Recommended
High-Speed Freewheeling and Clamping
Because Schottky diodes are majority-carrier devices with no reverse-recovery charge, the BAR46AFILM is well suited to freewheeling and clamping in low-power switching circuits, inductive-load kickback protection, and logic-level signal clamping. The dual common-anode array allows clamping two nodes to a shared reference with one package. Compared with fast-recovery PN diodes, the BAR46AFILM switches cleanly at the edge rates typical of small DC-DC converters and relay/valve drivers, reducing ringing and EMI. Its 100 V rating covers clamp nodes sitting on 48 V-class buses. Keep loop inductance low by placing the diode directly across the switch node, and remember that leakage rises steeply with temperature in hot enclosures.
Recommended
ORing of Dual Power Inputs
The dual-diode common-anode structure of the BAR46AFILM is a natural fit for diode-ORing two supply inputs, such as a battery backup feeding a mains-derived rail, or two adapters feeding a single load. With the common anode tied to the load node, each cathode connects to one input, and whichever source is higher conducts automatically. The 100 V rating tolerates wide input ranges, and the 450 mV forward drop keeps power loss modest for small-signal loads. For sub-millivolt droop requirements, an ideal-diode controller would replace the diodes, but for telecom and industrial standby circuits the passive BAR46AFILM solution is simpler, lower cost, and fails safe without firmware.
Recommended
Precision Rectification in Signal Chains
The low 450 mV forward voltage and fast Schottky switching of the BAR46AFILM allow its use in half-wave and envelope-detector circuits for audio, sensor, and measurement signal chains. In a precision active rectifier, placing one diode of the array inside an op-amp feedback loop removes the 450 mV drop from the transfer function while the Schottky junction keeps loop behavior fast. The second diode can implement a peak-hold reset or clamp on an adjacent channel. Its 100 V rating is rarely needed in low-voltage signal work but permits reuse across the whole product family. Mind the temperature-dependent leakage when holding peaks with high-impedance nodes, as leakage current can discharge hold capacitors over time.
Recommended
Battery-Powered and Portable Electronics
In battery-powered products, the BAR46AFILM serves as a charging-path isolation diode or reverse-installation protector, where its 450 mV drop reduces wasted energy versus standard silicon diodes. The SOT-23-3 package occupies minimal board area, and the FILM RoHS-compliant Tape and Reel format suits automated assembly. The 150 C rating tolerates reflow and nearby warm components. The main caution is leakage: Schottky leakage grows rapidly with temperature, so in devices that run warm or are charged at elevated ambient, verify that standby drain contributed by the diode is acceptable. Where every microamp matters, compare against the lower-leakage lower-voltage BAT46AFILM, accepting its 45 V limit.
Recommended
Recommended Products Summary
Engineering reference data for BAR46AFILM β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAT46AFILM | BAT54AFILM | BAR43AFILM | BAR46A |
|---|---|---|---|---|---|
| Package | SOT-23-3 (TO-236-3 / SC-59) | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Diode Configuration | Dual Common Anode | Dual Common Anode | Dual Common Anode | Dual Common Anode | Dual Common Anode |
| Repetitive Reverse Voltage | 100 V | 45 V | 30 V | 30 V | 100 V |
| Forward Current (DC) | 150 mA | 150 mA | 200 mA | 200 mA | 150 mA |
| Forward Voltage (VF) | 450 mV | 320 mV (typ.) | 320 mV (typ.) | [DATA_NEEDED] | 450 mV |
| Max Operating Temperature | 150 C | 150 C | 150 C | 150 C | 150 C |
| Unit Price (qty 1, as of 2026-09-13) | $0.11 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Marking Code | A46 | A46-family marking (verify per datasheet) | KL4 (verify per datasheet) | [DATA_NEEDED] | A46 |
Key Differentiators
- 100 V reverse rating in small-signal Schottky class (vs BAT54AFILM)
- Lower forward voltage than BAR46AFILM (vs BAT46AFILM)
- Identical die family and marking across packaging variants (vs BAR46A)
Design Notes
Schottky reverse leakage approximately doubles every 10 C of junction temperature. The BAR46AFILM 100 V rating inherently carries higher leakage than lower-voltage arrays, so in circuits running above 75 C ambient the effective loss term (leakage times reverse voltage) should be estimated and added to conduction loss. Estimated: at 10 uA leakage on a 48 V rail, leakage loss is only 0.48 mW, negligible; but at 100 uA it reaches 4.8 mW, which matters in battery standby budgets. Derate the 150 mA rating toward the 150 C maximum per the datasheet derating curve.
The SOT-23-3 package thermals depend almost entirely on PCB copper. Use at least 4 to 6 mm of copper area connected to the diode pads for continuous-current applications near the 150 mA rating. Keep the loop between the diode and the protected node short to minimize parasitic inductance, especially in freewheeling or clamping roles where the diode must respond to fast edges. Standard SOT-23 land patterns per IPC-7351 apply; the FILM Tape and Reel format is compatible with standard pick-and-place nozzles.
Do not assume all SOT-23 dual diodes share the same pinout: the BAR46AFILM is common anode (pin 2 common), while common-cathode and series-pair variants exist with different internal wiring. Substituting a BAT54A or BAR43A is electrically safe on pinout but only if your reverse voltage stays within their 30 V limits - a 48 V telecom rail will destroy them. Also note the marking code A46 is shared among several parts per SMD code databases, so verify devices by parameter test, not marking alone.
Compliance Information
RoHS compliant per the FILM suffix (ST Tape and Reel RoHS packaging) and DigiKey listing. REACH and halogen-free status not stated in verified data.
