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

STMicroelectronics BAR18FILM

Name: BAR18FILM
Brand: STMicroelectronics
SKU: BAR18FILM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAR18FILM

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: BAR18FILM.pdf

Description:: DIODE SCHOTTKY 70V 70MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:19,766

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Product details

Overview

BAR18FILM from STMicroelectronics is a dual-channel small-signal Schottky diode in SOT-23 package, designed for ultrafast switching and UHF detection in hybrid microcircuits. It features 70 V repetitive peak reverse voltage, 70 mA continuous forward current per diode, 410 mV typical forward voltage at 1 mA, 200 nA reverse leakage at 50 V, and 2 pF junction capacitance at 0 V.

For engineers reviewing the BAR18FILM datasheet, BAR18FILM pinout, BAR18FILM application, or BAR18FILM equivalent, key selection criteria include low forward voltage for signal rectification efficiency, sub-100 ps carrier lifetime for UHF detector response, and thermal resistance of 500 °C/W on epoxy board - critical for compact RF front-end designs.

Technical Context

The BAR18FILM integrates two independent Schottky diodes sharing a common cathode configuration (anode–cathode–anode), enabling balanced detection or dual-path clamping. Its low 410 mV forward voltage and 200 nA reverse leakage at 50 V support high-sensitivity RF envelope detection below 1 GHz.

With 2 pF junction capacitance at 0 V and 100 ps effective carrier lifetime (Krakauer method), it delivers fast recovery and minimal capacitive loading in UHF mixer and detector stages - validated under 5 mA pulse conditions with δ < 2% duty cycle.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	70 V - supports reverse bias up to 70 V without breakdown in RF detector or clamp circuits
I_F	70 mA per diode - enables low-current signal routing without thermal derating in SOT-23 footprint
V_F	410 mV @ 1 mA - minimizes forward loss in low-power envelope detection and sampling applications
I_R	200 nA @ 50 V - ensures high isolation in high-impedance detector nodes at room temperature
C_j	2 pF @ 0 V, 1 MHz - limits parasitic shunting in UHF (300–1000 MHz) signal paths
τ	100 ps - enables sub-nanosecond switching for pulse detection and harmonic generation
R_th(j-a)	500 °C/W on FR4 epoxy board - defines thermal limit for continuous 250 mW total dissipation

Pinout & Package

SOT-23 plastic package (3-pin, standard lead pitch 0.95 mm), with cathode-common dual-diode topology: Pin 1 = Anode 1, Pin 2 = Cathode (common), Pin 3 = Anode 2.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode of Diode 1	Input node for first signal path; connects to RF source or bias network
Pin 2	Common Cathode	Shared output/return node; requires low-inductance grounding for UHF stability
Pin 3	Anode of Diode 2	Input node for second signal path; enables differential or dual-channel detection

Key Features

Feature	Design Value
Ultra-low forward voltage	410 mV @ 1 mA - improves sensitivity in weak-signal RF detectors
Sub-100 ps carrier lifetime	100 ps - ensures clean transient response in pulse-shaping and UHF demodulation
Low junction capacitance	2 pF @ 0 V - preserves impedance matching in 50 Ω RF traces up to 1 GHz
High reverse breakdown margin	70 V V_RRM - accommodates transient spikes in hybrid microwave assemblies
Thermally robust layout	500 °C/W R_th(j-a) on FR4 - allows stable operation at 70 mA with minimal copper area

Applications

RF Envelope Detection

UHF Signal Sampling

Use Scenario: Demodulating AM signals in 433 MHz ISM-band receivers using passive diode detectors.

IC Role / Device Role / Timing Role: Dual-anode Schottky diode acting as synchronous envelope extractor with common-cathode output.

Use Value: 410 mV V_F enables detection of signals down to –20 dBm without external bias; 2 pF C_j avoids detuning 50 Ω input matching networks.

Use Scenario: Sampling RF bursts in time-domain reflectometry (TDR) test fixtures operating at 800 MHz.

IC Role / Device Role / Timing Role: Fast-switching sampling gate triggered by strobe pulses to capture transient waveforms.

Use Value: 100 ps τ ensures <10% timing skew across 1 ns pulses; low I_R maintains DC baseline integrity during hold phase.

Dual-Path Clamping

Hybrid Microwave Assembly

Use Scenario: Protecting ADC inputs in wideband instrumentation against ±5 V transients while preserving bandwidth.

IC Role / Device Role / Timing Role: Dual-anode clamp limiting both positive and negative excursions to V_F above/below reference rail.

Use Value: Matched V_F between channels (<5% variation) ensures symmetrical clipping; SOT-23 footprint minimizes trace inductance at 500 MHz.

Use Scenario: Integration into ceramic-based hybrid modules for satellite L-band transceivers requiring hermetic reliability.

IC Role / Device Role / Timing Role: On-board detector for local oscillator (LO) level monitoring and automatic gain control (AGC) feedback.

Use Value: 70 V V_RRM withstands LO feedthrough spikes; 150 °C T_j(max) supports operation in sealed high-temp enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BAS70-04	Identical electrical specs and SOT-23 pinout; differs only in marking (D96 vs D76) and minor process revision	No functional difference; qualified for same hybrid microcircuit assembly processes	Select when BAS70-04 is specified in legacy BOMs or preferred by contract manufacturer
NSR0230HT1G	Single Schottky diode (not dual); 30 V V_RRM, 200 mA I_F, 0.45 V V_F - higher current but lower voltage rating	Requires two devices for dual-path use; unsuitable for >50 V reverse-biased detection	Choose only for cost-sensitive, single-channel, low-voltage (<30 V) clamp applications where dual topology is unnecessary

Compared with BAS70-04, BAR18FILM offers identical performance and drop-in compatibility; versus NSR0230HT1G, it provides true dual-anode integration and 70 V reverse capability essential for UHF detector headroom - making it irreplaceable in space-constrained, high-frequency hybrid assemblies.

Availability

BAR18FILM is available at Aetrix Electronics and suitable for RF envelope detection, UHF signal sampling, and dual-path clamping requiring stable component supply in high-reliability hybrid microcircuit production.

Supply support for BAR18FILM 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, delivering analog, power, and RF components for industrial, automotive, and communications systems.

BAR18FILM belongs to ST's small-signal Schottky diode product line, engineered specifically for ultrafast switching and UHF detection in hybrid microwave circuits - emphasizing low V_F, minimal C_j, and thermal stability in miniature packages.

FAQ

What is the pin configuration of BAR18FILM?

BAR18FILM uses a standard SOT-23 package with three pins: Pin 1 is Anode 1, Pin 2 is the common Cathode, and Pin 3 is Anode 2. This cathode-common dual-diode arrangement supports balanced detection and dual-clamp topologies without external interconnects.

Does BAR18FILM support operation at elevated temperatures?

Yes - BAR18FILM is rated for junction temperatures up to 150 °C and storage from –65 °C to +150 °C. Its thermal resistance of 500 °C/W on FR4 ensures stable operation at full 70 mA per diode up to 100 °C ambient when mounted per recommended pad layout.

How does BAR18FILM compare to single-diode Schottky alternatives in UHF applications?

Unlike single-diode parts, BAR18FILM integrates two matched Schottky junctions in one SOT-23, eliminating layout mismatch and interconnect inductance. Its 2 pF C_j and 100 ps τ are optimized for UHF, whereas most single-diode equivalents lack guaranteed dual-channel matching or specified carrier lifetime.

Is BAR18FILM suitable for reflow soldering?

Yes - BAR18FILM is qualified for lead-free reflow with a maximum soldering temperature of 260 °C for 10 seconds. Its plastic SOT-23 package meets UL94 V0 flammability rating, and thermal profiles must respect the 150 °C max junction temperature during assembly.

BAR18FILM Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 70 V

Current - Average Rectified (Io):: 70mA

Voltage - Forward (Vf) (Max) @ If:: 410 mV @ 1 mA

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 200 nA @ 50 V

Capacitance @ Vr, F:: 2pF @ 0V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

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

BAR18FILM FAQ

1.How can I place an order for BAR18FILM through Aetrix?

Please submit a Request for Quotation (RFQ) for BAR18FILM 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 BAR18FILM reliable?

The price and inventory of BAR18FILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAR18FILM is usually 5 days.

3.What payment methods are accepted for BAR18FILM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAR18FILM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAR18FILM?

BAR18FILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAR18FILM 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 BAR18FILM?

For technical support, including BAR18FILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAR18FILM requirements.

6.How does Aetrix verify that BAR18FILM is sourced from the original manufacturer or authorized distributors?

All BAR18FILM 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 BAR18FILM meets industry standards.

7.What is the process for return or replacement of BAR18FILM?

All BAR18FILM units undergo pre-shipment inspection (PSI). If there is an issue with BAR18FILM, 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 BAR18FILM part is unused and in its original packaging.

Return procedure for BAR18FILM:

1.Submit a request within 90 days.

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

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