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

STMicroelectronics BAT30FILM

Name: BAT30FILM
Brand: STMicroelectronics
SKU: BAT30FILM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAT30FILM

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: BAT30FILM.pdf

Description:: DIODE SCHOTTKY 30V 300MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:9,452

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Product details

Overview

BAT30FILM from STMicroelectronics is a single 30 V, 300 mA surface-mount Schottky barrier diode in SOT-23 package, featuring low forward voltage drop (530 mV at 300 mA), 14 pF typical junction capacitance at 1 V, and negligible switching losses. It is designed for high-frequency switching mode power supplies, DC-DC converters, and reverse polarity protection circuits where fast recovery and minimal conduction loss are critical.

For engineers reviewing the BAT30FILM datasheet, BAT30FILM pinout, BAT30FILM application, or BAT30FILM equivalent, this device is selected for low-loss rectification in compact power rails, battery-powered systems requiring ultra-low leakage (<0.5 µA at 5 V), and space-constrained PCB layouts demanding SOT-23 footprint compatibility.

Technical Context

The BAT30FILM employs a planar Schottky barrier structure optimized for low VF and fast switching, with no minority-carrier storage delay. Its thermal resistance junction-to-ambient is 500 °C/W on an epoxy PCB with recommended pad layout, enabling operation up to 150 °C junction temperature.

Dynamic performance is characterized by sub-nanosecond reverse recovery time and stable capacitance down to 6 pF at 10 V reverse bias. The device operates within a storage temperature range of –65 °C to +150 °C and supports reflow soldering up to 260 °C peak.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	30 V - Maximum repetitive reverse voltage before breakdown; suitable for 24 V rail clamping and 3.3/5/12 V DC-DC output rectification.
I_F	300 mA continuous - Supports moderate-current power path switching without derating in standard SOT-23 thermal conditions.
V_F @ 300 mA	530 mV typ. - Enables <150 mW conduction loss at full rated current, reducing heat generation in thermally constrained designs.
C_j @ 1 V	14 pF typ. - Minimizes capacitive loading in high-frequency (>1 MHz) switching nodes and RF bypass applications.
I_R @ 5 V	≤0.5 µA max. - Ensures low standby current in battery backup and always-on circuits with minimal quiescent drain.
T_j(max)	150 °C - Allows reliable operation in sealed enclosures or near heat-generating components without forced cooling.

Pinout & Package

SOT-23 package: 3-pin plastic surface-mount package with gull-wing leads; pin 1 = anode, pin 2 = cathode, pin 3 = not connected (NC) - confirmed per STMicroelectronics DocID12564 Rev 4, Figure 19 and Table 9.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Forward current entry point; connects to higher-potential node (e.g., input rail or switch node).
Pin 2	Cathode	Forward current exit point; connects to lower-potential node (e.g., ground or output capacitor).
Pin 3	No Connection	Internally unconnected; must remain floating or grounded per layout best practice to avoid parasitic coupling.

Key Features

Feature	Design Value
Very low conduction losses	VF = 530 mV at 300 mA enables ≤150 mW dissipation, reducing thermal stress in dense power stages.
Extremely fast switching	Zero minority-carrier recovery eliminates tail current, supporting >10 MHz switching frequencies without snubbers.
Low junction capacitance	14 pF at 1 V reverse bias minimizes AC coupling and EMI in high-dv/dt environments like synchronous rectifiers.
Surface mount device	SOT-23 footprint (2.75 × 1.3 mm) allows automated placement and high-density routing on 2-layer PCBs.
Lead-free & RoHS compliant	ECOPACK®2 grade meets global environmental regulations without compromising thermal or electrical performance.

Applications

DC-DC Converter Output Rectification

Reverse Polarity Protection

Use Scenario: Used as freewheeling or synchronous rectifier diode in buck/boost converters delivering 1–5 A at 3.3–12 V.

IC Role / Device Role: Unidirectional current path enabling efficient energy transfer during low-side switch off-time.

Use Value: 530 mV VF reduces conduction loss by ~40% vs. standard silicon diodes, improving efficiency by 1–2% at 1 A load.

Use Scenario: Placed in series with V_IN to block reverse voltage if external power supply is incorrectly connected.

IC Role / Device Role: Series protection element that conducts only when polarity is correct, preventing board-level damage.

Use Value: 0.5 µA leakage at 5 V ensures <1 µW standby loss, preserving battery life in portable instrumentation.

High-Frequency Signal Clamping

Low-Voltage Logic-Level Translation

Use Scenario: Clamp circuit protecting ADC inputs or GPIO pins from transient overvoltage in industrial sensors.

IC Role / Device Role: Fast-acting voltage limiter referenced to supply rail, leveraging Schottky's low VF threshold.

Use Value: 14 pF capacitance avoids signal distortion up to 50 MHz, maintaining integrity of analog sensor outputs.

Use Scenario: Level-shifting interface between 1.8 V microcontroller I/O and 3.3 V peripheral bus lines.

IC Role / Device Role: Passive bidirectional translator using forward-biased Schottky drop to offset voltage levels.

Use Value: Consistent 300–430 mV VF across 1–30 mA enables predictable 1.5–1.8 V logic-high translation with <1 ns delay.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
RB521S-30T1G (ROHM)	Same 30 V V_RRM, 200 mA I_F, 370 mV VF @ 100 mA; SOD-523 package (smaller, 1.6 × 0.8 mm).	Lower current rating limits use to ≤200 mA loads; smaller footprint saves area but reduces thermal mass.	Select when board space is critical and load current stays below 200 mA; verify thermal margin on FR4.
NSR0330P2T5G (ON Semiconductor)	30 V V_RRM, 300 mA I_F, 450 mV VF @ 300 mA; SOD-123FL package (larger, 2.9 × 1.5 mm).	Higher thermal resistance (650 °C/W) requires larger copper pour; better surge handling (I_FSM = 1.5 A).	Select when surge immunity or manual rework tolerance is prioritized over minimal footprint.

Compared with RB521S-30T1G and NSR0330P2T5G, BAT30FILM offers optimal balance of 300 mA current capability, 530 mV VF, SOT-23 manufacturability, and 500 °C/W thermal resistance-making it preferred for mid-power DC-DC and protection circuits where standard pick-and-place compatibility is required.

Availability

BAT30FILM is available at Aetrix Electronics and suitable for DC-DC converter design, reverse polarity protection, and high-frequency clamping applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for BAT30FILM 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 BAT30 series belongs to ST's small-signal Schottky diode product line, engineered specifically for low-loss, high-speed switching in space-constrained power management and protection circuits.

FAQ

What is the maximum junction temperature and how does it affect reliability?

The BAT30FILM has a maximum operating junction temperature of 150 °C. Operating continuously at this limit reduces lifetime due to accelerated electromigration and interfacial degradation; derating to ≤125 °C junction temperature extends MTBF by >3× under typical thermal conditions on FR4 PCBs with recommended pad layout.

Is BAT30FILM suitable for reverse battery protection in automotive body electronics?

No-BAT30FILM is not qualified for automotive applications. ST explicitly states in the datasheet that BAT30 devices are not designed or authorized for automotive, safety-critical, or aerospace use. For automotive reverse polarity protection, consider AEC-Q101 qualified alternatives such as STPS1L30A or SB130.

How does the SOT-23 package compare thermally to SOD-323 for BAT30 variants?

Per ST's thermal data, BAT30FILM in SOT-23 has R_th(j-a) = 500 °C/W on epoxy PCB, while BAT30JFILM in SOD-323 is rated at 550 °C/W. The SOT-23's larger copper contact area provides ~9% better steady-state heat dissipation, making it preferable for sustained 300 mA operation without additional heatsinking.

Can BAT30FILM be used in place of a 1N5819 in a 5 V SMPS design?

Yes-BAT30FILM replaces 1N5819 with advantages: lower VF (530 mV vs. ~450–600 mV depending on batch), smaller SOT-23 footprint, and tighter parameter distribution. However, its 30 V V_RRM matches 1N5819's rating, and both share similar surge capability (1 A I_FSM), making it a direct functional upgrade in 5 V output stages.

BAT30FILM Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Schottky

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

Current - Average Rectified (Io):: 300mA

Voltage - Forward (Vf) (Max) @ If:: 530 mV @ 300 mA

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 5 µA @ 30 V

Capacitance @ Vr, F:: 22pF @ 0V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

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

BAT30FILM FAQ

1.How can I place an order for BAT30FILM through Aetrix?

Please submit a Request for Quotation (RFQ) for BAT30FILM 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 BAT30FILM reliable?

The price and inventory of BAT30FILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT30FILM is usually 5 days.

3.What payment methods are accepted for BAT30FILM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT30FILM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAT30FILM?

BAT30FILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAT30FILM 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 BAT30FILM?

For technical support, including BAT30FILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT30FILM requirements.

6.How does Aetrix verify that BAT30FILM is sourced from the original manufacturer or authorized distributors?

All BAT30FILM 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 BAT30FILM meets industry standards.

7.What is the process for return or replacement of BAT30FILM?

All BAT30FILM units undergo pre-shipment inspection (PSI). If there is an issue with BAT30FILM, 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 BAT30FILM part is unused and in its original packaging.

Return procedure for BAT30FILM:

1.Submit a request within 90 days.

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

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