BAT43 A0G Equivalent & Substitute Parts

Part Overview

The BAT43 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 BAT43 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	450 mV @ 15 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

Substitution of the BAT43 A0G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V minimum
Current - Average Rectified (Io): 200 mA minimum
Package / Case: DO-204AH, DO-35, Axial (through-hole)
Mounting Type: Through Hole
Technology: Schottky

Secondary Compatibility Factors:

Reverse Recovery Time (trr): 5 ns or faster
Operating Temperature Range: Must encompass application requirements
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment

Substitute parts are grouped into two categories:

Direct Equivalents (Matched Electrical Ratings): Parts with 30 V reverse voltage and 200 mA current rating, maintaining identical speed classification and thermal characteristics.

Functional Substitutes (Enhanced Ratings): Parts with 30 V reverse voltage but higher current ratings (350 mA or 500 mA), suitable for applications where the BAT43 A0G current capacity is marginal or where design margin is required.

Parameter Comparison

Parameter	BAT43 A0G	BAT42-TAP	BAT42-TR	BAT85S-TAP	SD103B-F	DSB0.5A30
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Diodes Incorporated	Microchip Technology
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	350 mA	500 mA
Voltage - Forward (Vf) (Max) @ If	450 mV @ 15 mA	650 mV @ 50 mA	650 mV @ 50 mA	800 mV @ 100 mA	600 mV @ 200 mA	650 mV @ 500 mA
Reverse Recovery Time (trr)	5 ns	5 ns	5 ns	5 ns	10 ns	Not specified
Current - Reverse Leakage @ Vr	100 nA @ 25 V	500 nA @ 25 V	500 nA @ 25 V	2 µA @ 25 V	5 µA @ 20 V	10 µA @ 30 V
Capacitance @ Vr, F	7 pF @ 1 V, 1 MHz	7 pF @ 1 V, 1 MHz	7 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz	50 pF @ 0 V, 1 MHz	60 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
Operating Temperature - Junction	-65°C ~ 125°C	125°C (Max)	125°C (Max)	-65°C ~ 150°C	125°C (Max)	-65°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Preferred Direct Equivalents:

BAT42-TR and BAT42-TAP are the primary substitutes for the BAT43 A0G. Both are manufactured by Vishay General Semiconductor and maintain identical voltage and current ratings (30 V, 200 mA). Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating. BAT42-TR offers significantly higher inventory availability (52,614 units) compared to BAT42-TAP (8,536 units). Both parts feature 5 ns reverse recovery time matching the original specification. The forward voltage specification differs at higher measurement current (650 mV @ 50 mA versus 450 mV @ 15 mA), reflecting standard datasheet measurement conditions rather than operational incompatibility.

Alternative with Extended Temperature Range:

BAT85S-TAP provides an extended operating temperature range (-65°C ~ 150°C) compared to the BAT43 A0G (-65°C ~ 125°C), suitable for applications requiring higher maximum junction temperature operation. This part maintains 30 V reverse voltage and 200 mA current ratings with 5 ns reverse recovery time. Forward voltage is higher (800 mV @ 100 mA) and reverse leakage current is elevated (2 µA @ 25 V), requiring circuit evaluation for applications sensitive to these parameters.

Higher Current Capacity Alternatives:

SD103B-F (350 mA) and DSB0.5A30 (500 mA) provide increased current handling for applications where the 200 mA rating is marginal. Both maintain 30 V reverse voltage and DO-35 packaging. SD103B-F is ROHS3 compliant but discontinued at DiGi Electronics. DSB0.5A30 is active but RoHS non-compliant, limiting use in regulated environments. Both exhibit higher reverse leakage current and capacitance than the BAT43 A0G.

Compliance Considerations:

For applications requiring RoHS3 compliance, BAT42-TR, BAT42-TAP, and BAT85S-TAP are suitable. DSB0.5A30 is not compliant and unsuitable for regulated procurement. All recommended substitutes maintain REACH unaffected status and EAR99 export classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can BAT42-TR directly replace BAT43 A0G in existing designs?

A: Yes. BAT42-TR maintains identical voltage (30 V), current (200 mA), and reverse recovery time (5 ns) specifications. Both are through-hole DO-35 packages with matching pinout. The part is active with full RoHS3 compliance and high inventory availability.

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

A: Both are Vishay BAT42 Schottky diodes with identical electrical specifications (30 V, 200 mA, 5 ns trr). The difference is packaging format: BAT42-TAP is supplied in cut tape (CT) format, while BAT42-TR is supplied in tape reel (TR) format. Electrical performance is identical.

Q: Why does BAT85S-TAP show higher forward voltage than BAT43 A0G?

A: Forward voltage specifications are measured at different current levels. BAT43 A0G specifies 450 mV @ 15 mA, while BAT85S-TAP specifies 800 mV @ 100 mA. At equivalent current levels, forward voltage characteristics are comparable. The higher specification reflects measurement at higher current density.

Q: Can I use SD103B-F or DSB0.5A30 as substitutes?

A: These parts are functional substitutes with higher current ratings (350 mA and 500 mA respectively) but are not direct equivalents. SD103B-F is discontinued at DiGi Electronics. DSB0.5A30 is RoHS non-compliant, restricting use in regulated applications. Use only if circuit design accommodates higher reverse leakage current and capacitance.

Q: What is the impact of higher reverse leakage current in substitute parts?

A: Reverse leakage current affects circuit performance in high-impedance applications and at elevated temperatures. BAT42 series shows 500 nA @ 25 V (5× higher than BAT43 A0G at 100 nA). BAT85S-TAP shows 2 µA @ 25 V (20× higher). Evaluate circuit sensitivity to leakage current before substitution.

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

A: Yes. All listed substitutes use DO-204AH, DO-35, Axial through-hole packaging with identical pinout and mechanical dimensions, enabling direct board-level replacement without layout modification.

Q: What is the temperature range consideration for BAT85S-TAP?

A: BAT85S-TAP operates from -65°C to 150°C, extending 25°C above the BAT43 A0G maximum (125°C). This is beneficial for high-temperature applications but not required for standard -65°C to 125°C operation.

Q: Why is DSB0.5A30 marked RoHS non-compliant?

A: DSB0.5A30 does not meet RoHS3 compliance requirements, likely due to material composition or manufacturing process. This restricts use in applications subject to RoHS regulations, including EU markets and regulated industries.

Q: Can I mix BAT42-TR and BAT42-TAP in the same design?

A: Yes. Both parts are electrically identical Vishay BAT42 diodes. The only difference is supply format (tape reel versus cut tape). Mixing is acceptable from an electrical and functional standpoint.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message