BAT41-TR - 100V 100mA Schottky Diode DO-35 | Vishay
MPN: BAT41-TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.18 | $0.18 |
| 10 | $0.14 | $1.40 |
| 100 | $0.09 | $9.00 |
| 500 | $0.06 | $30.00 |
| 1,000 | $0.045 | $45.00 |
BAT41-TR Overview
A small-signal Schottky diode is a two-terminal semiconductor rectifier that uses a metal-to-silicon junction instead of a PN junction. Because majority-carrier conduction dominates, Schottky diodes exhibit a lower turn-on voltage and essentially zero reverse recovery time compared with standard silicon rectifier diodes, placing them high in the diode hierarchy: signal diode -> rectifier diode -> semiconductor discrete component. They are fundamental building blocks for switching-mode circuits, protection networks, and signal detection stages.
The BAT41 series from Vishay General Semiconductor - Diodes Division features a low turn-on voltage combined with a high breakdown voltage, an unusual and valuable combination since most low-VF Schottky devices are limited to 40 V to 60 V ratings. The die is protected by a PN junction guard ring against excessive voltages such as electrostatic discharge (ESD), improving ruggedness in assembly and field conditions. Extremely fast switching with low forward and reverse recovery times makes the device specially suited for switching-mode operation with low IR losses.
The metallurgical metal-semiconductor junction construction delivers a low junction capacitance, which supports high-frequency rectification, detector, and clipping/clamping functions. The glass DO-35 body provides a hermetic seal with good long-term stability, a benefit over plastic SMD alternatives in moisture-sensitive environments.
Typical applications include small-signal rectification and switching in audio equipment (guitar pedals frequently use BAT41 diodes for clipping and switching stages), reverse-polarity protection of low-current supply rails, ESD and overvoltage clamping in sensitive analog nodes, and detector circuits in RF front ends.
When designing with the BAT41-TR, keep the average forward current below the 100 mA rating and account for the relatively high reverse leakage of Schottky junctions at elevated temperature, which can affect bias points in precision analog circuits.
This page synthesizes verified distributor data, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for BAT41-TR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BAT41-E3/TR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
BAT41-V
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
BAT41-TR Maximum Ratings & Electrical Characteristics
| Diode Type | Small Signal Schottky |
| Repetitive Reverse Voltage (VRRM) | 100 V |
| Average Forward Current (IF(AV)) | 100 mA |
| Forward Voltage (VF) Max | 450 mV |
| Peak Forward Surge Current (IFSM) | 750 mA |
| Technology | Metal-to-silicon Schottky barrier with PN junction guard ring |
| Switching Characteristic | Extremely fast switching, low forward and reverse recovery times |
| Mounting Type | Through Hole |
| Package | DO-204AH (DO-35) glass axial |
| Pin Count | 2 |
| Configuration | Single diode |
| ESD Protection | PN junction guard ring against excessive voltage / ESD |
| Qualification | AEC-Q101 qualified version available (part number on request) |
| Packaging | Tape & Reel (-TR suffix) |
BAT41-TR Pin Configuration
| Pin 1 | Anode β Positive terminal of the Schottky junction (unbanded end) |
| Pin 2 | Cathode β Terminal marked by the band; current exits here during forward conduction |
Typical Applications
BAT41-TR is suitable for 6 applications: Audio Pedal Clipping and Switching, Reverse-Polarity and Battery Protection, Small-Signal Switching and Clamp Networks, RF Detector and Envelope Detection, Industrial Panel and Relay Circuit Protection, OR-ing and Rail Steering of Auxiliary Supplies.
Audio Pedal Clipping and Switching
The BAT41-TR is a staple in guitar effects pedals, where Schottky diodes define the clipping character of overdrive, distortion, and reverb circuits. Its 450 mV maximum forward voltage clips the audio signal earlier and more gently than the roughly 1 V turn-on of a 1N4148, producing a softer, more compressed tone that many pedal designers specifically target. Because the metal-semiconductor junction has negligible reverse recovery, the diode does not inject switching artifacts into the audio band. Hobbyist and professional pedal communities consistently specify BAT41 for clipping stages and for diode-switched signal routing (e.g., reverb enable networks), where the 100 V reverse rating gives ample margin over pedal supply rails of 9 V to 18 V. The DO-35 glass body suits hand assembly and point-to-point wiring typical of pedal building.
Recommended
Reverse-Polarity and Battery Protection
In battery-powered and portable equipment, the BAT41-TR provides low-loss reverse-polarity protection for supply rails drawing under 100 mA. Its 100 V repetitive reverse rating comfortably withstands accidental battery reversal even in 24 V industrial signaling loops, while the 450 mV forward voltage preserves most of the supply headroom, an important factor for 5 V and 3.3 V analog circuits. Compared with a series silicon PN diode that sacrifices up to 1 V, the Schottky junction roughly halves the wasted voltage. The PN junction guard ring adds ESD robustness during connector handling and field battery swaps. Designers should account for elevated reverse leakage at high ambient temperature, since Schottky leakage doubles roughly every 10 C, which can matter in sleep-current budgets of battery devices.
Recommended
Small-Signal Switching and Clamp Networks
The BAT41-TR excels in general-purpose switching-mode circuits and voltage clamps where speed and low IR losses matter more than current capacity. Vishay characterizes the device as extremely fast with low forward and reverse recovery times, making it specially suited for switching-mode operation, per the datasheet. Typical uses include clamping sensitive analog inputs to supply rails, steering signals in sample-and-hold and peak-detector networks, and steering charge in discrete charge pumps below 100 mA. The 100 V rating allows clamping on industrial 24 V rails with margin. Because the junction capacitance is small, the diode adds minimal loading to high-impedance nodes, preserving signal integrity in detector and envelope-follower stages.
Recommended
RF Detector and Envelope Detection
With its low turn-on voltage of 450 mV and small junction capacitance, the BAT41-TR functions as a detector diode in RF front ends, envelope detectors, and signal-strength meters for frequencies up to the hundreds of megahertz region where package parasitics permit. The low forward voltage means weaker signals can overcome the conduction threshold, improving detection sensitivity relative to silicon PN diodes. Vishay specifically markets the device for switching-mode operation with low IR losses, and the guard-ring structure stabilizes the junction against ESD transients picked up by antennas. In practice the diode is used with an RC load network to extract the envelope of modulated carriers in receiver AGC loops and inexpensive RF power meters.
Recommended
Industrial Panel and Relay Circuit Protection
In industrial control panels, the BAT41-TR protects logic-level inputs from 24 V loop overvoltages and provides freewheeling paths for small relays and coils where the coil current stays within the 100 mA rating. The 100 V repetitive reverse voltage covers transients on 24 V industrial signaling systems, and the glass DO-35 package tolerates panel environments with temperature and humidity better than unsealed plastic packages. The extremely fast switching with low reverse recovery makes the diode suitable as a freewheeling element in low-side switching circuits driven by logic transistors, reducing turn-off voltage spikes. For higher-current solenoids, the device should be paired with a larger rectifier rather than used alone.
Recommended
OR-ing and Rail Steering of Auxiliary Supplies
The BAT41-TR steers current between redundant low-power supplies or between a backup battery and the main rail in systems drawing less than 100 mA per branch. Its 450 mV forward voltage reduces the droop compared with a series PN diode, and the 100 V rating permits use on higher-voltage auxiliary buses such as 48 V telecom sensing rails with derating. Because the part has negligible reverse recovery, switchover transients generate minimal reverse-current spikes, which simplifies decoupling. Designers should verify thermal behavior: with 100 mA continuous current the diode dissipates roughly 45 mW, well within the DO-35 capability, but multiple parallel diodes are not recommended for current sharing because VF mismatch prevents even distribution.
Recommended
Recommended Products Summary
Engineering reference data for BAT41-TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAT41-E3/TR | BAT41-V |
|---|---|---|---|
| Package | DO-204AH (DO-35) axial | DO-204AH (DO-35) - same | DO-204AH (DO-35) - same |
| Brand | Vishay General Semiconductor - Diodes Division | Vishay Intertechnology | Vishay Intertechnology |
| Repetitive Reverse Voltage (VRRM) | 100 V | 100 V | 100 V |
| Average Forward Current | 100 mA | 100 mA | 100 mA |
| Forward Voltage Max | 450 mV | 450 mV | 450 mV |
| Peak Surge Current (IFSM) | 750 mA | 750 mA | 750 mA |
| Qualification | General purpose (AEC-Q101 version on request) | General purpose | AEC-Q101 automotive grade |
| Mounting Type | Through Hole | Through Hole | Through Hole |
Key Differentiators
- Unusual 100 V rating for a low-VF small-signal Schottky (vs BAT85)
- Automotive-qualified sibling available in same footprint (vs BAT41-V)
- Fast Schottky switching with no reverse recovery (vs 1N4148)
Design Notes
Do not exceed the 100 mA average forward current or the 750 mA peak surge rating (IFSM). Inrush events from large downstream bulk capacitors can exceed IFSM at power-up even when steady-state current is small; estimated: charging a 100 uF cap from 24 V through 10 ohms gives ~2.4 A initial surge, so add series resistance or a larger diode if bulk capacitance is significant. Also remember Schottky reverse leakage rises steeply with temperature, which can disturb high-impedance bias nodes in precision analog circuits.
In audio clipping applications, the 450 mV forward voltage of the BAT41 produces a distinctly lower clipping threshold than silicon PN diodes like the 1N4148 (approximately 1 V). When blending Schottky and PN clipping paths, the level mismatch changes the harmonic balance, so adjust gain staging rather than assuming identical output levels. In detector circuits, forward-voltage temperature drift (about -2 mV/C per estimate typical for Schottky junctions) causes detection level shift; compensation may be needed in precision measurement designs.
The DO-35 axial package is tolerant of hand soldering and wave soldering, but keep lead-length-induced heating in mind: solder iron contact time should be short and the lead between the solder joint and glass body provides the thermal path. For automated assembly, maintain the package lead pitch per datasheet footprint and support the body to prevent stress cracking of the glass seal during lead bending. Form leads at least 2 mm from the body using proper bending tools, not pliers against the glass.
Compliance Information
Vishay BAT41 datasheet notes AEC-Q101 qualified version available (part number on request). RoHS status and lead-free/prefix coding per Vishay product page; REACH and halogen details not stated in provided data.
