BAT43-L0 A0 Equivalent & Substitute Parts

Part Overview

The BAT43-L0 A0 is a Schottky diode manufactured by Taiwan Semiconductor Corporation, rated for 30 V DC reverse voltage and 200 mA average rectified current in a DO-35 through-hole package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BAT43-L0 A0 operates across a junction temperature range of -65°C to 125°C and complies with RoHS3 and REACH regulations.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA
Reverse Recovery Time (trr)	5 ns
Current - Reverse Leakage @ Vr	500 nA @ 25 V
Capacitance @ Vr, F	7 pF @ 1 V, 1 MHz
Package / Case	DO-204AH, DO-35, Axial
Operating Temperature - Junction	-65°C ~ 125°C
Technology	Schottky
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the BAT43-L0 A0 is determined by electrical and mechanical parameter alignment within the Schottky diode category. The primary substitution criteria are:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 30 V minimum
Current - Average Rectified (Io): 200 mA minimum
Reverse Recovery Time (trr): 5 ns or faster
Technology: Schottky

Mechanical Parameters:

Package / Case: DO-204AH (DO-35) through-hole configuration
Mounting Type: Through Hole, Axial

Compliance & Status:

RoHS3 Compliant
REACH Unaffected
Operating Temperature Range: -65°C minimum to 125°C minimum

The BAT85S-TR qualifies as a substitute part because it meets or exceeds all critical electrical specifications, maintains identical package geometry, and provides enhanced performance characteristics while maintaining full regulatory compliance.

Parameter Comparison

Parameter	BAT43-L0 A0	BAT85S-TR	Compatibility
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	Equivalent
Current - Average Rectified (Io)	200 mA	200 mA	Equivalent
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	800 mV @ 100 mA	BAT85S-TR Superior
Reverse Recovery Time (trr)	5 ns	5 ns	Equivalent
Current - Reverse Leakage @ Vr	500 nA @ 25 V	2 µA @ 25 V	BAT43-L0 A0 Superior
Capacitance @ Vr, F	7 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz	BAT43-L0 A0 Superior
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	Equivalent
Operating Temperature - Junction	-65°C ~ 125°C	-65°C ~ 150°C	BAT85S-TR Superior
Technology	Schottky	Schottky	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

The BAT85S-TR manufactured by Vishay General Semiconductor - Diodes Division is a direct substitute for the obsolete BAT43-L0 A0. Both components share identical voltage and current ratings, package geometry, and regulatory compliance status.

The BAT85S-TR offers the following advantages:

Product Status: Active production status ensures long-term availability and supply chain continuity, contrasting with the obsolete status of the BAT43-L0 A0.
Extended Temperature Range: Operating junction temperature extends to 150°C, providing 25°C additional margin beyond the BAT43-L0 A0 specification.
Improved Forward Voltage: Forward voltage of 800 mV at 100 mA demonstrates superior switching efficiency compared to the 1 V specification at 200 mA.
Regulatory Compliance: Full RoHS3 and REACH compliance maintained.

The BAT85S-TR is suitable for direct replacement in applications where the BAT43-L0 A0 was previously specified, with no circuit modifications required.

Frequently Asked Questions (FAQ)

Q: Can the BAT85S-TR replace the BAT43-L0 A0 in existing designs?

A: Yes. Both components share identical voltage ratings (30 V), current ratings (200 mA), reverse recovery time (5 ns), and DO-35 package geometry. The BAT85S-TR meets all electrical and mechanical requirements for direct substitution.

Q: What are the key differences between these parts?

A: The BAT85S-TR provides lower forward voltage (800 mV at 100 mA versus 1 V at 200 mA), extended operating temperature range (-65°C to 150°C versus -65°C to 125°C), and active product status. The BAT43-L0 A0 exhibits lower reverse leakage current (500 nA versus 2 µA) and lower junction capacitance (7 pF versus 10 pF).

Q: Are there any package compatibility concerns?

A: No. Both components use the DO-204AH (DO-35) axial through-hole package. Pin-to-pin compatibility is maintained, and no PCB modifications are required.

Q: Why is the BAT43-L0 A0 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The BAT85S-TR provides equivalent functionality with active manufacturing support.

Q: What compliance certifications apply to the BAT85S-TR?

A: The BAT85S-TR is RoHS3 Compliant and REACH Unaffected, matching the compliance profile of the BAT43-L0 A0.

Q: Are there applications where the BAT43-L0 A0 characteristics are preferred?

A: Applications requiring minimal reverse leakage current (500 nA specification) or lowest junction capacitance (7 pF specification) may benefit from the BAT43-L0 A0 characteristics. However, the BAT85S-TR remains functionally compatible for standard Schottky diode applications within the specified voltage and current parameters.

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