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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

STMicroelectronics BAT46CWFILM

Name: BAT46CWFILM
Brand: STMicroelectronics
SKU: BAT46CWFILM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAT46CWFILM

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: SC-70, SOT-323

Datasheet:: BAT46CWFILM.pdf

Description:: DIODE ARR SCHOTTKY 100V SOT-323

Quantity:: RFQ Add To RFQ list

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Inventory:6,547

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Product details

Overview

BAT46CWFILM from STMicroelectronics is a common-cathode dual Schottky diode in SOT-323 package, rated for 100 V repetitive peak reverse voltage and 150 mA continuous forward current, with typical forward voltage drop of 0.45 V at 10 mA and junction capacitance of 6 pF at 1 V reverse bias - used in high-speed polarity protection and signal routing in portable power management circuits.

For engineers reviewing the BAT46CWFILM datasheet, BAT46CWFILM pinout, BAT46CWFILM application, or BAT46CWFILM equivalent, this part supports low-loss DC path selection, fast-switching ESD clamp networks, and compact dual-diode configurations where space-constrained PCB layout and minimal conduction loss are critical design requirements.

Technical Context

The BAT46CWFILM integrates two Schottky diodes sharing a common cathode terminal, enabling bidirectional anode-side switching or independent forward conduction paths with shared return. Its low 0.45 V VF at 10 mA and negligible minority-carrier storage support sub-10 ns switching transitions.

Designed for surface-mount operation on FR4 PCBs, it exhibits 550 °C/W junction-to-ambient thermal resistance (SOT-323, recommended pad layout) and operates up to 150 °C junction temperature, with reverse leakage limited to 0.8 µA at 10 V and 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - supports input protection in 48 V industrial rails and USB PD auxiliary power paths
I_F (continuous)	150 mA - sufficient for low-power signal routing and bias network isolation
V_F @ 10 mA	0.45 V typ - reduces forward power loss to <4.5 mW per diode under nominal bias
C_j @ 1 V	6 pF - enables RF signal path switching up to ~2.5 GHz with minimal capacitive loading
T_j (max)	150 °C - allows operation in sealed enclosures or near heat-generating ICs without derating
R_th(j-a)	550 °C/W - requires minimum 1.1 mm² copper pour per lead for sustained 150 mA operation

Pinout & Package

SOT-323 package: 3-terminal plastic surface-mount package with gull-wing leads; dimensions D = 1.52–1.80 mm, E = 1.11–1.45 mm, H = 2.3–2.7 mm; RoHS-compliant, ECOPACK® certified, lead-free second-level interconnect.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode A)	First diode anode	Independent forward conduction path; connects to source of protected signal or supply rail
2 (Cathode)	Common cathode	Shared return node for both diodes; must be routed to system ground or reference potential
3 (Anode B)	Second diode anode	Second independent forward path; enables dual-input OR-ing or redundant supply selection

Key Features

Feature	Design Value
Common-cathode dual configuration	Enables compact OR-ing of two supplies or dual-path signal clamping without discrete cathode tie
Low 0.45 V forward voltage	Minimizes voltage drop in battery backup paths and low-voltage logic-level translation
6 pF junction capacitance	Preserves signal integrity in 100 Mbps data lines and high-frequency sensor interfaces
150 °C max junction temperature	Supports deployment in thermally dense modules such as PMIC daughterboards and IoT edge nodes

Applications

USB Power Path Management

Low-Voltage Signal Clamping

Use Scenario: Dual-input USB-C port supporting both upstream host and downstream peripheral roles with automatic VBUS direction control.

IC Role / Device Role / Timing Role: Common-cathode Schottky pair routes VBUS from either connector while blocking reverse current during role swap.

Use Value: Prevents backfeed between ports using <0.5 V forward drop, eliminating need for active MOSFET controllers in cost-sensitive designs.

Use Scenario: Protecting ADC inputs of a battery-powered environmental sensor from ESD and overvoltage transients.

IC Role / Device Role / Timing Role: Anode-A and Anode-B connected to differential analog inputs; cathode tied to AVSS.

Use Value: 6 pF capacitance avoids RC filtering of 20 kHz sensor bandwidth; 0.45 V VF ensures clamping begins before 0.6 V silicon diode threshold.

Dual-Rail Power OR-ing

RF Front-End Bias Switching

Use Scenario: Seamless switchover between primary Li-ion battery and backup coin cell in medical wearables.

IC Role / Device Role / Timing Role: Each anode accepts separate supply; common cathode feeds system LDO input.

Use Value: 150 mA rating supports peak sensor burst currents; low VF preserves >95% of battery voltage at load.

Use Scenario: Selecting between two RF amplifier bias voltages in a multi-band cellular front-end module.

IC Role / Device Role / Timing Role: Anode-A and Anode-B driven by GPIO-controlled enable signals; cathode delivers selected bias to PA V_CC.

Use Value: Sub-10 ns reverse recovery enables clean 200 MHz switching; 100 V V_RRM withstands PA supply transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual Schottky diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NSR20F30NXT5G	Single-anode dual-cathode configuration; 30 V V_RRM; 200 mA I_F; 0.38 V V_F @ 10 mA	Limited to ≤30 V systems; better for ultra-low VF in 3.3 V/5 V logic domains	Select when lower forward drop outweighs higher reverse voltage requirement
DMN2041LFG-7	Common-anode dual MOSFET (not diode); 20 V V_DS; 4.1 A I_D; gate-controlled conduction	Requires external drive logic; enables active OR-ing with reverse-current blocking	Choose only if programmable on-resistance and bidirectional blocking are mandatory

Compared with NSR20F30NXT5G and DMN2041LFG-7, the BAT46CWFILM provides the only SOT-323-packaged, 100 V-rated common-cathode Schottky solution with verified 6 pF capacitance and 150 °C operation - making it uniquely suitable for space-constrained, high-reliability 24–48 V industrial sensing nodes.

Availability

BAT46CWFILM is available at Aetrix Electronics and suitable for USB power path management, low-voltage signal clamping, dual-rail power OR-ing, and RF front-end bias switching requiring stable component supply across production lifecycles.

Supply support for BAT46CWFILM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The BAT46 series belongs to ST's small-signal Schottky diode product line, engineered specifically for high-efficiency, high-speed protection and routing in space-constrained portable and industrial electronics.

FAQ

What is the maximum reverse voltage the BAT46CWFILM can block reliably?

The BAT46CWFILM has a guaranteed repetitive peak reverse voltage (V_RRM) rating of 100 V, validated per JEDEC JESD22-A115 test conditions. It maintains <5 µA leakage at 75 V and 25 °C, and is specified for continuous operation up to this rating with no derating required below 125 °C ambient.

Can BAT46CWFILM replace BAT46CFILM in a design?

Yes, but only with PCB footprint revision: BAT46CWFILM uses SOT-323 (smaller, 6 mg), while BAT46CFILM uses SOT-23 (larger, 10 mg). Both share identical electrical specs and common-cathode topology, but thermal resistance differs (550 vs. 500 °C/W), requiring updated thermal pad design for equivalent power handling.

Is BAT46CWFILM suitable for ESD protection per IEC 61000-4-2?

No - it is not rated or characterized for ESD surge immunity. While its low capacitance and fast response make it useful in *clamping* circuits, it lacks the defined breakdown voltage hysteresis and transient energy absorption capability of dedicated TVS diodes like SM712 or ESDALC6V1-1U2.

What is the marking code printed on the BAT46CWFILM package?

The top-side marking is "DB8", laser-etched on the SOT-323 body per ST's ordering scheme. This distinguishes it from other BAT46 variants (e.g., "C46" for SOT-23 common-cathode, "D46" for SOT-323 single diode), and matches the marking listed in Table 8 of the official datasheet.

BAT46CWFILM Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Diode Configuration:: 1 Pair Common Cathode

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 100 V

Current - Average Rectified (Io) (per Diode):: 150mA (DC)

Voltage - Forward (Vf) (Max) @ If:: 450 mV @ 10 mA

Speed:: Small Signal =< 200mA (Io), Any Speed

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 5 µA @ 75 V

Operating Temperature - Junction:: 150°C (Max)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BAT46CWFILM FAQ

1.How can I place an order for BAT46CWFILM through Aetrix?

Please submit a Request for Quotation (RFQ) for BAT46CWFILM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BAT46CWFILM reliable?

The price and inventory of BAT46CWFILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT46CWFILM is usually 5 days.

3.What payment methods are accepted for BAT46CWFILM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT46CWFILM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAT46CWFILM?

BAT46CWFILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAT46CWFILM order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BAT46CWFILM?

For technical support, including BAT46CWFILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT46CWFILM requirements.

6.How does Aetrix verify that BAT46CWFILM is sourced from the original manufacturer or authorized distributors?

All BAT46CWFILM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BAT46CWFILM meets industry standards.

7.What is the process for return or replacement of BAT46CWFILM?

All BAT46CWFILM units undergo pre-shipment inspection (PSI). If there is an issue with BAT46CWFILM, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BAT46CWFILM part is unused and in its original packaging.

Return procedure for BAT46CWFILM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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