BAT82S-TAP Equivalent & Substitute Parts

Part Overview

The BAT82S-TAP is an active Schottky diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 50 V DC reverse voltage and 30 mA average rectified current in a through-hole DO-35 package. This component is qualified to AEC-Q101 automotive standards and carries ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design optimization, or application-specific requirements within the allowed parameter ranges for Schottky rectifier diodes.

Key Parameters

Parameter	BAT82S-TAP
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
Capacitance @ Vr, F	1.6 pF @ 1V, 1MHz
Technology	Schottky
Package / Case	DO-204AH, DO-35, Axial
Mounting Type	Through Hole
Operating Temperature - Junction (Max)	125°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Allowed Substitution Parameters:

Both components utilize Schottky diode technology
Both are packaged in DO-35 (DO-204AH) through-hole axial configuration
Both maintain forward voltage characteristics within acceptable operating ranges for small-signal applications
Both comply with ROHS3 and carry unlimited moisture sensitivity level (MSL 1)
Both operate within compatible temperature ranges for automotive and industrial applications

Critical Consideration: The BAT42 operates at a maximum reverse voltage of 30 V, which is lower than the BAT82S-TAP specification of 50 V. Substitution is valid only in applications where the circuit design does not exceed 30 V reverse bias conditions. The BAT42 supports higher average rectified current (200 mA) compared to the BAT82S-TAP (30 mA), making it suitable for higher current applications within the 30 V voltage constraint.

Parameter Comparison

Parameter	BAT82S-TAP (Vishay)	BAT42 (STMicroelectronics)	Compatibility Notes
Voltage - DC Reverse (Vr) (Max)	50 V	30 V	BAT42 rated for lower voltage; verify circuit maximum reverse bias does not exceed 30 V
Current - Average Rectified (Io)	30 mA	200 mA	BAT42 supports higher current capability
Voltage - Forward (Vf) (Max) @ If	1 V @ 15 mA	1 V @ 200 mA	Forward voltage characteristics comparable at respective current levels
Current - Reverse Leakage @ Vr	200 nA @ 50 V	500 nA @ 25 V	BAT42 exhibits higher leakage current; acceptable for most applications
Capacitance @ Vr, F	1.6 pF @ 1V, 1MHz	7 pF @ 1V, 1MHz	BAT42 has higher junction capacitance; consider for high-frequency switching applications
Technology	Schottky	Schottky	Identical technology
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	Identical package; direct mechanical interchange
Mounting Type	Through Hole	Through Hole	Identical mounting; PCB layout compatible
Operating Temperature - Junction	125°C (Max)	-65°C ~ 125°C	BAT42 specifies operating range; both support 125°C maximum
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical MSL rating

Engineering Selection Recommendations

BAT82S-TAP Selection Criteria:

Applications requiring 50 V reverse voltage rating
Circuits with strict reverse bias voltage specifications exceeding 30 V
Automotive-grade requirements with AEC-Q101 qualification
Low-capacitance switching applications (1.6 pF @ 1V, 1MHz)
Current requirements up to 30 mA average rectified current

BAT42 Selection Criteria:

Applications operating at maximum 30 V reverse bias
Higher current capability requirements (up to 200 mA average rectified current)
ROHS3 compliance and unlimited MSL requirements
Circuits tolerant of higher junction capacitance (7 pF @ 1V, 1MHz)
Reverse recovery time specification of 5 ns is critical for switching performance

Both components maintain active product status and full compliance with ROHS3 and REACH regulations. Selection between these parts depends exclusively on circuit voltage and current requirements within the specified parameter ranges.

Frequently Asked Questions (FAQ)

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

A: No. The BAT42 is rated for a maximum reverse voltage of 30 V, while the BAT82S-TAP is rated for 50 V. Substitution is valid only in circuits where the reverse bias voltage does not exceed 30 V. Verify the maximum reverse voltage specification in your circuit design before substitution.

Q: What is the primary electrical difference between these two diodes?

A: The BAT82S-TAP supports higher reverse voltage (50 V vs. 30 V), while the BAT42 supports higher average rectified current (200 mA vs. 30 mA). Forward voltage characteristics are comparable at their respective rated currents.

Q: Are the packages mechanically identical?

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

Q: Does the BAT42 have automotive qualification?

A: The provided specifications do not indicate AEC-Q101 qualification for the BAT42. If automotive-grade qualification is a design requirement, the BAT82S-TAP is the appropriate selection.

Q: What is the impact of higher capacitance in the BAT42?

A: The BAT42 has a junction capacitance of 7 pF @ 1V, 1MHz, compared to 1.6 pF for the BAT82S-TAP. Higher capacitance may affect high-frequency switching performance and should be evaluated in applications with switching frequencies above 1 MHz.

Q: Are both components RoHS compliant?

A: Yes. Both the BAT82S-TAP and BAT42 are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

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