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

STMicroelectronics BAT41

Name: BAT41
Brand: STMicroelectronics
SKU: BAT41
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAT41

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: BAT41.pdf

Description:: DIODE SCHOTTKY 100V 100MA DO35

Quantity:: RFQ Add To RFQ list

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Inventory:33,371

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Product details

Overview

BAT41 from STMicroelectronics is a general-purpose silicon Schottky barrier diode in DO-35 glass package, featuring 100 V repetitive peak reverse voltage, 100 mA forward continuous current at 25°C, and 0.45 V typical forward voltage at 200 mA. It delivers fast switching with 2 pF junction capacitance at 1 V reverse bias and integrated ESD protection, used in low-voltage DC power rail clamping and signal rectification in portable instrumentation.

For engineers reviewing the BAT41 datasheet, BAT41 pinout, BAT41 application, or BAT41 equivalent, key selection criteria include its low VF (0.45 V @ 200 mA), low IR (0.1 µA @ 50 V), thermal resistance of 300 °C/W, and DO-35 mechanical compatibility with through-hole PCB layouts requiring minimal board space.

Technical Context

The BAT41 employs a metal–silicon Schottky junction to achieve low forward voltage drop and rapid recovery without minority-carrier storage delay. Its 2 pF capacitance at 1 V reverse bias and 750 mA non-repetitive surge rating support high-frequency signal routing and transient suppression in compact analog front-ends.

Rated for junction temperatures from –65°C to +125°C and lead soldering up to 230°C for 10 s, it operates reliably under convection/conduction cooling on standard FR-4 boards without heatsinking, meeting requirements for battery-powered sensor nodes and low-power interface circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - supports DC input rails up to 80 V with safety margin against transients
I_F	100 mA - suitable for signal-level and low-current biasing applications
V_F @ 200 mA	0.45 V - minimizes conduction loss in 3.3 V or 5 V logic supply paths
I_R @ 50 V	0.1 µA - ensures negligible leakage in high-impedance sensing nodes
C @ 1 V	2 pF - enables use in ≤100 MHz signal routing without significant capacitive loading
R_th(j-a)	300 °C/W - allows operation up to 125°C junction temperature with no forced airflow

Pinout & Package

DO-35 glass axial package with cathode identified by a clear ring marking at one end; leads are tinned copper alloy, 0.458–0.558 mm diameter, 28 mm total length, 3.05–4.50 mm body length.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to higher-potential node in clamping or rectification path
Cathode	Forward current exit / reverse blocking terminal	Marked with ring; tied to reference or lower-potential rail for unidirectional conduction

Key Features

Feature	Design Value
Low forward voltage	0.45 V @ 200 mA - reduces power loss in low-voltage bias networks
Fast switching	No minority-carrier storage - enables clean edge transitions in pulse detection
ESD protection	Integrated structure withstands human-body-model discharges ≥2 kV
Thermal robustness	Junction rated to +125°C - supports operation in sealed enclosures without derating

Applications

Portable Sensor Signal Conditioning

USB Port Voltage Clamping

Use Scenario: Biasing op-amp inputs and protecting ADC reference pins in battery-powered environmental sensors.

IC Role / Device Role / Timing Role: Signal-level clamp and ESD protection diode placed directly at sensor interface connector.

Use Value: 0.1 µA reverse leakage preserves high-impedance node accuracy; 0.45 V VF avoids disturbing 3.3 V reference rails.

Use Scenario: Preventing overvoltage damage to USB D+/D− lines during hot-plug events.

IC Role / Device Role / Timing Role: Bidirectional clamping diode in series with TVS array on USB data lines.

Use Value: 2 pF capacitance avoids signal integrity degradation at Full-Speed (12 Mbps) USB data rates.

Low-Power RF Detector Circuits

Microcontroller Reset Line Protection

Use Scenario: Demodulating AM envelope signals in sub-GHz ISM band receivers.

IC Role / Device Role / Timing Role: Passive detector diode in crystal-limited RF front-end, operating below 100 MHz.

Use Value: Fast recovery and low C enable accurate envelope capture without phase distortion.

Use Scenario: Isolating external reset button from MCU reset pin while suppressing ESD.

IC Role / Device Role / Timing Role: Series isolation diode preventing backfeed from pull-up resistors during button press.

Use Value: 100 mA I_F rating handles typical reset switch currents; DO-35 fits manual assembly workflows.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5711	V_F = 0.45 V @ 15 mA (higher VF at low current); C = 4 pF @ 0 V	Higher capacitance limits use above 50 MHz; less suitable for RF detectors	Prefer BAT41 where low C or tighter VF consistency across current range is required
BAT54	Surface-mount SOT-23 package; V_F = 0.33 V @ 10 mA but derates faster above 50 mA	Not compatible with through-hole assembly; requires rework for legacy designs	Select BAT41 for DO-35 footprint retention and thermal performance in ambient >85°C

Compared with 1N5711 and BAT54, BAT41 offers superior high-frequency response due to lower capacitance, better thermal stability in through-hole layouts, and more consistent forward voltage behavior across its rated current range-critical for precision analog interfaces.

Availability

BAT41 is available at Aetrix Electronics and suitable for portable instrumentation, USB interface protection, RF detector circuits, and microcontroller reset line isolation requiring stable component supply and long-term manufacturability.

Supply support for BAT41 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, digital, and mixed-signal ICs and discrete devices for industrial, automotive, and consumer markets.

The BAT41 belongs to ST's general-purpose discrete diode product line, engineered for cost-sensitive, space-constrained applications demanding reliable low-VF rectification and ESD resilience without active circuitry.

FAQ

Is BAT41 suitable for reverse polarity protection in 5 V systems?

No. With only 100 mA continuous forward current rating and no integrated current-limiting, BAT41 is not designed for main power path protection. It is intended for signal-level clamping and low-current rectification. For reverse polarity protection, use dedicated power MOSFET-based solutions or higher-current Schottky diodes like SB160.

What is the maximum allowable soldering temperature for BAT41 leads?

The BAT41 lead temperature must not exceed 230°C for durations up to 10 seconds, measured 4 mm from the case. Exceeding this limit risks internal bond wire damage or hermetic seal compromise. Standard wave or hand-soldering profiles compliant with IPC-J-STD-020 are acceptable.

Does BAT41 have a specified reverse recovery time (t_rr)?

No-BAT41 is a Schottky diode and does not exhibit minority-carrier reverse recovery. Its switching is governed by junction capacitance discharge, resulting in effectively zero t_rr. This eliminates switching spikes and simplifies layout in high-speed signal paths where conventional PN diodes would require snubbers.

Can BAT41 replace BAT42 in existing designs?

Yes, with verification. BAT42 has identical DO-35 packaging and electrical specs except for V_RRM (200 V vs. 100 V). If the application reverse voltage stays below 80 V, BAT41 is a direct functional replacement. However, do not substitute in 100–200 V reverse-biased scenarios without circuit review.

BAT41 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

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

Current - Average Rectified (Io):: 100mA

Voltage - Forward (Vf) (Max) @ If:: 450 mV @ 1 mA

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 100 nA @ 50 V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

Operating Temperature - Junction:: -65°C ~ 125°C

BAT41 FAQ

1.How can I place an order for BAT41 through Aetrix?

Please submit a Request for Quotation (RFQ) for BAT41 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 BAT41 reliable?

The price and inventory of BAT41 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT41 is usually 5 days.

3.What payment methods are accepted for BAT41?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT41 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAT41?

BAT41 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAT41 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 BAT41?

For technical support, including BAT41 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT41 requirements.

6.How does Aetrix verify that BAT41 is sourced from the original manufacturer or authorized distributors?

All BAT41 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 BAT41 meets industry standards.

7.What is the process for return or replacement of BAT41?

All BAT41 units undergo pre-shipment inspection (PSI). If there is an issue with BAT41, 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 BAT41 part is unused and in its original packaging.

Return procedure for BAT41:

1.Submit a request within 90 days.

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

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