BAT42 A0G Equivalent & Substitute Parts

Part Overview

The BAT42 A0G 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 equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BAT42 A0G serves applications requiring small-signal Schottky rectification with fast switching characteristics and low forward voltage drop.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	200 mA
Voltage - Forward (Vf) (Max) @ If	650 mV @ 50 mA
Reverse Recovery Time (trr)	5 ns
Current - Reverse Leakage @ Vr	100 nA @ 25 V
Capacitance @ Vr, F	7 pF @ 1 V, 1 MHz
Package / Case	DO-204AH, DO-35, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-65°C ~ 125°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BAT42 A0G are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 200 mA
Package / Case: DO-204AH, DO-35, Axial (through-hole)
Technology: Schottky
Reverse Recovery Time (trr): 5 ns

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 650 mV @ 50 mA
Current - Reverse Leakage @ Vr: 100 nA @ 25 V
Capacitance @ Vr, F: 7 pF @ 1 V, 1 MHz
Operating Temperature - Junction: -65°C ~ 125°C
RoHS3 Compliance

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria) and Compatible Alternatives (matching voltage and current ratings with acceptable parameter variations).

Parameter Comparison

Parameter	BAT42 A0G	BAT85S-TAP	BAT42-TAP	BAT42-TR	DSB0.5A30	SD103B-F
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology	Diodes Incorporated
Product Status	Obsolete	Active	Active	Active	Active	Discontinued at DiGi Electronics
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA	500 mA	350 mA
Voltage - Forward (Vf) (Max) @ If	650 mV @ 50 mA	800 mV @ 100 mA	650 mV @ 50 mA	650 mV @ 50 mA	650 mV @ 500 mA	600 mV @ 200 mA
Reverse Recovery Time (trr)	5 ns	5 ns	5 ns	5 ns	Fast Recovery ≤ 500 ns	10 ns
Current - Reverse Leakage @ Vr	100 nA @ 25 V	2 µA @ 25 V	500 nA @ 25 V	500 nA @ 25 V	10 µA @ 30 V	5 µA @ 20 V
Capacitance @ Vr, F	7 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz	7 pF @ 1 V, 1 MHz	7 pF @ 1 V, 1 MHz	60 pF @ 0 V, 1 MHz	50 pF @ 0 V, 1 MHz
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-65°C ~ 125°C	-65°C ~ 150°C	125°C (Max)	125°C (Max)	-65°C ~ 125°C	125°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Packaging	-	Cut Tape (CT)	Cut Tape (CT)	Cut Tape (CT)	-	-

Engineering Selection Recommendations

Direct Equivalents (Preferred Substitutes):

BAT42-TR and BAT42-TAP are the primary substitute options for the BAT42 A0G. Both are manufactured by Vishay General Semiconductor and maintain active product status. These parts match the critical electrical parameters: 30 V reverse voltage, 200 mA average rectified current, 650 mV forward voltage at 50 mA, 5 ns reverse recovery time, and 7 pF capacitance. Both are ROHS3 compliant and available in DO-35 through-hole packaging. BAT42-TAP includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Compatible Alternative (Higher Current Rating):

BAT85S-TAP is an active substitute with identical voltage and current ratings to the BAT42 A0G. This part exhibits higher forward voltage (800 mV @ 100 mA) and increased reverse leakage current (2 µA @ 25 V) compared to the original specification. BAT85S-TAP supports an extended operating temperature range (-65°C ~ 150°C) and is ROHS3 compliant. This option is suitable when the higher forward voltage and leakage characteristics are acceptable within circuit design margins.

Higher Current Alternatives (Design Flexibility):

DSB0.5A30 and SD103B-F provide higher current ratings (500 mA and 350 mA respectively) while maintaining 30 V reverse voltage and DO-35 packaging. DSB0.5A30 is RoHS non-compliant, limiting its use in regulated environments. SD103B-F is discontinued at DiGi Electronics, affecting long-term availability. Both exhibit higher capacitance and reverse leakage characteristics than the BAT42 A0G, requiring circuit re-evaluation for timing-sensitive applications.

Compliance Considerations:

All recommended direct equivalents (BAT42-TR, BAT42-TAP, BAT85S-TAP) maintain ROHS3 compliance and REACH unaffected status, matching the original BAT42 A0G specifications. Selection should prioritize active product status and compliance alignment with system requirements.

Frequently Asked Questions (FAQ)

Q: Can BAT42-TR and BAT42-TAP be used interchangeably with BAT42 A0G?

A: Yes. Both parts match the critical electrical specifications: 30 V reverse voltage, 200 mA average rectified current, 650 mV forward voltage at 50 mA, 5 ns reverse recovery time, and 7 pF capacitance. Both are available in DO-35 through-hole packaging and are ROHS3 compliant. The primary difference is packaging format (cut tape versus bulk), which does not affect electrical performance.

Q: What is the difference between BAT42-TAP and BAT42-TR?

A: Both parts are electrically identical and manufactured by Vishay General Semiconductor. The designation suffix indicates packaging format: TAP denotes cut tape packaging with automotive qualification (AEC-Q101), while TR denotes tape reel packaging. Electrical performance and DO-35 package dimensions are identical.

Q: Is BAT85S-TAP a suitable replacement for BAT42 A0G?

A: BAT85S-TAP is functionally compatible with matching voltage and current ratings. However, it exhibits higher forward voltage (800 mV @ 100 mA versus 650 mV @ 50 mA) and increased reverse leakage current (2 µA @ 25 V versus 100 nA @ 25 V). Circuit designs must accommodate these parameter differences, particularly in applications sensitive to forward voltage drop or leakage current.

Q: Why are DSB0.5A30 and SD103B-F listed as alternatives if they have higher current ratings?

A: These parts maintain the 30 V reverse voltage and DO-35 through-hole package compatibility. The higher current ratings (500 mA and 350 mA) provide design flexibility for applications requiring increased current capacity. However, both exhibit significantly higher capacitance and reverse leakage, requiring evaluation for timing-critical circuits. DSB0.5A30 is RoHS non-compliant, and SD103B-F is discontinued, limiting their suitability for new designs.

Q: Are all substitute parts available in the same DO-35 package?

A: Yes. All listed substitute parts are available in DO-204AH (DO-35) axial through-hole packaging, ensuring mechanical and pin compatibility with the BAT42 A0G. Packaging format differences (cut tape, tape reel, or bulk) do not affect physical dimensions or mounting characteristics.

Q: What compliance certifications should I verify when selecting a substitute?

A: All recommended direct equivalents (BAT42-TR, BAT42-TAP, BAT85S-TAP) are ROHS3 compliant and REACH unaffected, matching the BAT42 A0G specifications. BAT42-TAP includes AEC-Q101 automotive qualification for applications requiring automotive-grade components. DSB0.5A30 is RoHS non-compliant and should not be used in regulated environments requiring RoHS compliance.

Q: Can I use a higher current-rated diode as a direct replacement?

A: Higher current-rated diodes (DSB0.5A30 at 500 mA, SD103B-F at 350 mA) are mechanically compatible in DO-35 packaging but introduce electrical parameter variations. Increased capacitance (60 pF and 50 pF respectively versus 7 pF) affects high-frequency performance. Increased reverse leakage current (10 µA and 5 µA respectively versus 100 nA) impacts circuit biasing. Circuit re-evaluation is required before substitution.

Q: What is the operating temperature range difference between substitutes?

A: BAT42 A0G and DSB0.5A30 operate from -65°C to 125°C. BAT85S-TAP extends to -65°C to 150°C, providing wider temperature margin. BAT42-TAP, BAT42-TR, and SD103B-F specify 125°C maximum junction temperature without lower limit specification. Application thermal requirements should guide selection.

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