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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics BAR42FILM

Name: BAR42FILM
Brand: STMicroelectronics
SKU: BAR42FILM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAR42FILM

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BAR42FILM.pdf

Description:: DIODE SCHOTTKY 30V 100MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:23,087

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Product details

Overview

BAR42FILM from STMicroelectronics is a single small-signal Schottky diode in SOT23-3L package, designed for low-loss signal rectification and high-speed switching in space-constrained circuits. It delivers 0.35 V typical forward voltage at 10 mA, 30 V repetitive peak reverse voltage, and 500 nA reverse leakage at 25 °C, enabling use in RF detector front-ends and precision clamping in portable audio amplifiers.

For engineers reviewing the BAR42FILM datasheet, BAR42FILM pinout, BAR42FILM application, or BAR42FILM equivalent, key selection criteria include its 7 pF junction capacitance at 1 V, 80 ps detection efficiency at 45 MHz, 150 °C maximum junction temperature, and compatibility with lead-free reflow profiles up to 260 °C.

Technical Context

The BAR42FILM implements a metal–silicon Schottky barrier structure optimized for minimal conduction loss and negligible switching loss. Its low turn-on voltage (0.35 V typ. @ 10 mA) and fast recovery (5 ns reverse recovery time) support high-frequency operation without minority-carrier storage delay.

Thermal performance is defined by a 500 °C/W junction-to-ambient thermal resistance on standard FR4 epoxy board with recommended pad layout. The device operates across –65 °C to +150 °C storage range and sustains 0.75 A non-repetitive surge current for 10 ms.

Key Specifications

Parameter	Value and Actual Design Meaning
IF(AV)	0.1 A continuous forward current - supports low-power signal path rectification without thermal derating on standard PCBs
VRRM	30 V repetitive peak reverse voltage - suitable for 24 V rail clamping and 5 V logic-level protection
VF (max)	0.40 V @ 10 mA - enables efficient biasing in low-voltage detector and sampling circuits
C (typ.)	7 pF @ VR = 1 V, f = 1 MHz - ensures minimal capacitive loading in 45 MHz RF detection paths
IR (max)	100 µA @ Tj = 100 °C - maintains signal integrity in thermally stressed sensor interfaces
trr	5 ns - allows clean edge transitions in digital waveform shaping and pulse clipping
Rth(j-a)	500 °C/W - defines thermal margin for ambient operation up to 75 °C with no heatsink

Pinout & Package

SOT23-3L surface-mount package with gull-wing leads, UL94 V0 epoxy molding compound, and lead-free finish compliant with ECOPACK® standards. Dimensions per ST DocID3288 Rev 5: D = 2.75–3.04 mm, E = 1.2–1.6 mm, e1 = 1.7–2.1 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	Forward current entry point	Connected to input signal source in clamp/detector configurations
2 (Cathode)	Forward current exit / reverse blocking terminal	Bias reference node; tied to ground or positive rail depending on topology
3 (Anode)	Not applicable - BAR42FILM is single diode; pin 3 is NC (no internal connection)	Unused terminal; must remain unconnected per datasheet layout guidance

Key Features

Feature	Design Value
Low VF Schottky architecture	0.35 V typ. @ 10 mA - reduces power loss and self-heating in battery-powered detectors
Fast switching capability	5 ns trr - preserves rise/fall times in pulse-shaping networks without ringing
Small junction capacitance	7 pF @ 1 V - minimizes frequency-dependent attenuation in RF envelope detection
High-temperature operation	150 °C max Tj - supports deployment in automotive cabin modules and industrial sensor housings
Lead-free and RoHS-compliant	ECOPACK® grade - meets global environmental compliance for consumer and medical end equipment

Applications

RF Signal Detection

Precision Clamping

Use Scenario: Demodulating AM signals in compact wireless receivers operating at 45 MHz.

IC Role / Device Role / Timing Role: Schottky diode acting as envelope detector with minimal forward drop and low C_j.

Use Value: 80 ps detection efficiency and 7 pF capacitance maintain signal fidelity and SNR above 40 dB.

Use Scenario: Protecting ADC inputs from overvoltage transients in portable audio codecs.

IC Role / Device Role / Timing Role: Low-V_F clamp limiting analog input swing to ±0.4 V.

Use Value: 0.35 V typical V_F ensures accurate threshold control without DC offset error.

Low-Power Logic Level Shifting

High-Speed Pulse Conditioning

Use Scenario: Translating 1.8 V logic signals to 3.3 V domains in wearables with tight power budgets.

IC Role / Device Role / Timing Role: Passive level translator using forward-biased Schottky drop.

Use Value: 0.40 V max V_F guarantees reliable high-level recognition while consuming <1 µA standby current.

Use Scenario: Sharpening slow-rising clock edges in microcontroller reset circuits.

IC Role / Device Role / Timing Role: Edge accelerator via fast recovery and low C_j.

Use Value: 5 ns trr and 7 pF capacitance reduce propagation delay variation to <1 ns across temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar small-signal Schottky diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NSR0230HT1G	0.32 V VF max @ 10 mA; 10 pF C_j; SOD-523 package	Higher capacitance limits use above 30 MHz; smaller footprint reduces thermal mass	Select when board area is critical and RF frequency ≤30 MHz
BAT54C,215	Dual common-cathode configuration; 0.33 V VF max @ 10 mA; 10 pF C_j	Requires layout adaptation for single-diode use; higher C_j degrades HF detection	Choose only if dual-diode functionality is needed in same design

Compared with NSR0230HT1G and BAT54C,215, BAR42FILM offers the lowest junction capacitance (7 pF) and best high-frequency detection efficiency (80 ps), making it preferred for 45 MHz RF front-ends where signal integrity is critical.

Availability

BAR42FILM is available at Aetrix Electronics and suitable for RF signal detection, precision clamping, low-power logic level shifting, and high-speed pulse conditioning requiring stable component supply and consistent parametric performance across production lots.

Supply support for BAR42FILM 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, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

BAR42FILM belongs to ST's general-purpose small-signal Schottky diode product line, engineered specifically for high-frequency detection, low-loss clamping, and fast-switching applications in space-constrained and thermally demanding environments.

FAQ

What is the maximum soldering temperature and duration for BAR42FILM?

The BAR42FILM supports a maximum soldering temperature of 260 °C for 10 seconds during reflow, per STMicroelectronics' qualified lead-free process. This aligns with IPC/JEDEC J-STD-020D.3 requirements and ensures mechanical and electrical integrity of the SOT23-3L package under standard surface-mount assembly conditions.

Is BAR42FILM suitable for reverse polarity protection in 5 V systems?

No - BAR42FILM is not rated for reverse polarity protection due to its 30 V V_RRM and 0.1 A I_F(AV), which are insufficient for sustained power-rail blocking. It lacks the surge rating and thermal robustness required for input protection; dedicated power Schottky diodes like STPS1L30 or SMBJ5.0A are recommended instead.

Does BAR42FILM have a specified reverse recovery charge (Qrr)?

No - Qrr is not specified in the official STMicroelectronics datasheet (DocID3288 Rev 5). As a low-capacitance Schottky diode, it exhibits negligible minority-carrier storage, and recovery is dominated by junction capacitance discharge. Designers should rely on trr = 5 ns and C = 7 pF for timing analysis rather than Qrr-based models.

Can BAR42FILM be used in place of BAR43FILM?

Only in applications where forward voltage tolerance ≥0.40 V is acceptable. BAR42FILM has higher VF (0.35–0.40 V @ 10 mA) than BAR43FILM (0.26–0.33 V @ 2 mA), resulting in greater conduction loss at low currents. Substitution requires verification of circuit headroom and thermal margin, especially in battery-operated detectors.

BAR42FILM Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Last Time Buy

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 30 V

Current - Average Rectified (Io):: 100mA

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 100 mA

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

Reverse Recovery Time (trr):: 5 ns

Current - Reverse Leakage @ Vr:: 500 nA @ 30 V

Capacitance @ Vr, F:: 7pF @ 1V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

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

BAR42FILM FAQ

1.How can I place an order for BAR42FILM through Aetrix?

Please submit a Request for Quotation (RFQ) for BAR42FILM 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 BAR42FILM reliable?

The price and inventory of BAR42FILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAR42FILM is usually 5 days.

3.What payment methods are accepted for BAR42FILM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAR42FILM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAR42FILM?

BAR42FILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAR42FILM 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 BAR42FILM?

For technical support, including BAR42FILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAR42FILM requirements.

6.How does Aetrix verify that BAR42FILM is sourced from the original manufacturer or authorized distributors?

All BAR42FILM 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 BAR42FILM meets industry standards.

7.What is the process for return or replacement of BAR42FILM?

All BAR42FILM units undergo pre-shipment inspection (PSI). If there is an issue with BAR42FILM, 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 BAR42FILM part is unused and in its original packaging.

Return procedure for BAR42FILM:

1.Submit a request within 90 days.

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

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