BAT82S-TR Equivalent & Substitute Parts

Part Overview

The BAT82S-TR is an active Schottky diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 50V DC reverse voltage and 30mA average rectified current in a through-hole DO-35 package. This component is qualified to AEC-Q101 automotive standards and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	30	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 15 mA	—
Current - Reverse Leakage @ Vr	200 nA @ 50 V	—
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	—
AEC-Q101 Qualification	Yes	—

Substitute Part Grouping Explanation

Substitution of the BAT82S-TR with the BAT42 is permissible based on the following electrical and mechanical criteria:

Allowed Substitution Parameters:

Both components utilize Schottky diode technology
Both are packaged in DO-35 (DO-204AH) through-hole axial configuration
Both operate within compatible temperature ranges (maximum junction temperature 125°C)
Both comply with RoHS3 and REACH regulations
Both are classified as small signal diodes (≤200mA Io category)

Substitution Constraints: The BAT42 operates at a lower maximum reverse voltage (30V) compared to the BAT82S-TR (50V). This substitution is valid only in applications where the circuit reverse voltage does not exceed 30V. The BAT42 provides higher current capacity (200mA) and lower reverse recovery time (5ns), making it suitable for higher-frequency or higher-current applications within its voltage rating.

Parameter Comparison

Parameter	BAT82S-TR (Main)	BAT42 (Substitute)	Unit
Manufacturer	Vishay General Semiconductor	STMicroelectronics	—
Technology	Schottky	Schottky	—
Voltage - DC Reverse (Vr) (Max)	50	30	V
Current - Average Rectified (Io)	30	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 15 mA	1 V @ 200 mA	—
Current - Reverse Leakage @ Vr	200 nA @ 50 V	500 nA @ 25 V	—
Reverse Recovery Time (trr)	Not specified	5	ns
Capacitance @ Vr, F	1.6 pF @ 1V, 1MHz	7 pF @ 1V, 1MHz	—
Mounting Type	Through Hole	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction	125 (Max)	-65 ~ 125	°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Product Status	Active	Active	—

Engineering Selection Recommendations

BAT82S-TR Selection Criteria: Select the BAT82S-TR when the application requires a maximum reverse voltage rating of 50V and current handling of 30mA. This component is qualified to AEC-Q101 automotive standards, making it suitable for automotive-grade applications. The lower capacitance (1.6pF) and lower reverse leakage current (200nA @ 50V) are advantageous in high-impedance or precision signal applications.

BAT42 Selection Criteria: Select the BAT42 when the application operates at reverse voltages not exceeding 30V and requires higher current capacity (200mA) or faster switching characteristics (5ns reverse recovery time). The BAT42 is suitable for general-purpose rectification and switching applications where the lower voltage rating is acceptable. Both components maintain RoHS3 compliance and active product status.

Compliance Considerations: Both components are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99. The BAT82S-TR carries AEC-Q101 automotive qualification; the BAT42 does not specify this qualification. Component selection should account for automotive-grade requirements if applicable to the end application.

Frequently Asked Questions (FAQ)

Q: Can the BAT42 directly replace the BAT82S-TR in all applications?

A: No. The BAT42 has a maximum reverse voltage rating of 30V, while the BAT82S-TR is rated for 50V. Direct substitution is valid only in circuits where the reverse voltage does not exceed 30V. Exceeding this voltage rating will result in component failure.

Q: What are the physical package differences between these parts?

A: Both components use the DO-35 (DO-204AH) through-hole axial package. They are mechanically interchangeable in PCB layouts designed for this package type.

Q: Does the BAT42 have automotive qualification?

A: The BAT42 is not specified as AEC-Q101 qualified. The BAT82S-TR carries AEC-Q101 automotive qualification. Applications requiring automotive-grade components should use the BAT82S-TR.

Q: What is the significance of the capacitance difference between these diodes?

A: The BAT82S-TR has lower capacitance (1.6pF) compared to the BAT42 (7pF). Lower capacitance is beneficial in high-frequency applications and precision signal circuits where capacitive loading must be minimized.

Q: Are there any temperature range differences?

A: The BAT42 specifies an operating temperature range of -65°C to 125°C, while the BAT82S-TR specifies a maximum junction temperature of 125°C. Both components operate within compatible ranges for standard industrial and automotive applications.

Q: What is the difference in reverse leakage current?

A: The BAT82S-TR exhibits 200nA reverse leakage at 50V, while the BAT42 exhibits 500nA at 25V. Lower reverse leakage is advantageous in high-impedance circuits and precision analog applications.

Q: Can the BAT42 handle higher current than the BAT82S-TR?

A: Yes. The BAT42 is rated for 200mA average rectified current, compared to 30mA for the BAT82S-TR. The BAT42 is suitable for higher-current applications within its 30V voltage rating.

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