BAT43W-7 Equivalent & Substitute Parts

Part Overview

The BAT43W-7 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 30 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-123 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts satisfy the same functional requirements within the allowed parameter ranges for Schottky diode rectifiers in this category.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
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	10 pF @ 1 V, 1 MHz	—
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAT43W-7 is determined by the following critical parameters:

Mandatory Matching Parameters:

Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 200 mA
Reverse Recovery Time (trr): 5 ns
Current - Reverse Leakage @ Vr: 500 nA @ 25 V
Mounting Type: Surface Mount
Package / Case: SOD-123
Operating Temperature Range: -55°C to 125°C minimum

Allowable Parameter Variations:

Voltage - Forward (Vf) (Max) @ If: Substitute parts may specify different test conditions (e.g., 450 mV @ 15 mA or 650 mV @ 50 mA) while maintaining functional equivalence
Capacitance @ Vr, F: Substitute parts may range from 7 pF to 10 pF @ 1 V, 1 MHz
RoHS Status: Substitute parts may be ROHS3 compliant, representing an improvement over the non-compliant original
Product Status: Active or Last Time Buy parts are acceptable substitutes for discontinued parts

Substitute parts are grouped into two categories: direct manufacturer equivalents from Diodes Incorporated and parametric equivalents from Vishay General Semiconductor - Diodes Division. All listed substitutes maintain the core electrical performance and mechanical compatibility required for drop-in replacement.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If	trr [ns]	Ir @ Vr [nA]	C @ Vr [pF]	Package	Product Status	RoHS Status
BAT43W-7	Diodes Incorporated	30	200	1 V @ 200 mA	5	500 @ 25 V	10 @ 1 V, 1 MHz	SOD-123	Discontinued	RoHS non-compliant
BAT43W-7-F	Diodes Incorporated	30	200	1 V @ 200 mA	5	500 @ 25 V	10 @ 1 V, 1 MHz	SOD-123	Active	ROHS3 Compliant
BAT42W-7-F	Diodes Incorporated	30	200	1 V @ 200 mA	5	500 @ 25 V	10 @ 1 V, 1 MHz	SOD-123	Active	ROHS3 Compliant
BAT42W-HE3-08	Vishay General Semiconductor - Diodes Division	30	200	650 mV @ 50 mA	5	500 @ 25 V	7 @ 1 V, 1 MHz	SOD-123	Last Time Buy	ROHS3 Compliant
BAT43W-HE3-08	Vishay General Semiconductor - Diodes Division	30	200	450 mV @ 15 mA	5	500 @ 25 V	7 @ 1 V, 1 MHz	SOD-123	Last Time Buy	ROHS3 Compliant
BAT42W-E3-08	Vishay General Semiconductor - Diodes Division	30	200	650 mV @ 50 mA	5	500 @ 25 V	7 @ 1 V, 1 MHz	SOD-123	Active	ROHS3 Compliant
BAT42W-E3-18	Vishay General Semiconductor - Diodes Division	30	200	650 mV @ 50 mA	5	500 @ 25 V	7 @ 1 V, 1 MHz	SOD-123	Active	ROHS3 Compliant
BAT42W-G3-08	Vishay General Semiconductor - Diodes Division	30	200	650 mV @ 50 mA	5	500 @ 25 V	7 @ 1 V, 1 MHz	SOD-123	Active	ROHS3 Compliant
BAT43W-E3-08	Vishay General Semiconductor - Diodes Division	30	200	450 mV @ 15 mA	5	500 @ 25 V	7 @ 1 V, 1 MHz	SOD-123	Active	ROHS3 Compliant
BAT43W-E3-18	Vishay General Semiconductor - Diodes Division	30	200	450 mV @ 15 mA	5	500 @ 25 V	7 @ 1 V, 1 MHz	SOD-123	Active	ROHS3 Compliant
BAT43W-G3-18	Vishay General Semiconductor - Diodes Division	30	200	450 mV @ 15 mA	5	500 @ 25 V	7 @ 1 V, 1 MHz	SOD-123	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Choice):

BAT43W-7-F from Diodes Incorporated is the direct equivalent replacement. This part maintains identical electrical specifications to the BAT43W-7, including forward voltage characteristics and capacitance values. The BAT43W-7-F is currently in active production status with ROHS3 compliance, providing regulatory advantage over the discontinued original part. This substitution requires no circuit redesign or performance re-evaluation.

Alternative Equivalent (Diodes Incorporated):

BAT42W-7-F from Diodes Incorporated provides parametric equivalence with identical electrical performance. Both BAT42 and BAT43 base series maintain the same core specifications for this application. The BAT42W-7-F is active and ROHS3 compliant.

Vishay General Semiconductor Alternatives:

Active production parts from Vishay General Semiconductor - Diodes Division include BAT42W-E3-08, BAT42W-E3-18, BAT42W-G3-08, BAT43W-E3-08, BAT43W-E3-18, and BAT43W-G3-18. These parts satisfy all mandatory electrical parameters with reduced capacitance (7 pF versus 10 pF) and alternative forward voltage test conditions. All Vishay alternatives are ROHS3 compliant and in active production status.

BAT42W-HE3-08 and BAT43W-HE3-08 from Vishay are available but designated as Last Time Buy, indicating limited future availability.

Compliance Consideration:

All substitute parts listed are ROHS3 compliant, representing an improvement over the RoHS non-compliant BAT43W-7. This compliance upgrade eliminates regulatory restrictions on new designs and manufacturing.

Frequently Asked Questions (FAQ)

Q: Can BAT43W-7-F be used as a direct replacement for BAT43W-7?

A: Yes. BAT43W-7-F is the direct equivalent with identical electrical and mechanical specifications. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant). No circuit modifications are required.

Q: What is the difference between BAT42 and BAT43 series parts?

A: Both BAT42 and BAT43 series maintain the same core electrical specifications for 30 V, 200 mA Schottky rectifier applications. The series designation reflects internal design variations that do not affect functional equivalence in this parameter range. BAT42W-7-F and BAT43W-7-F are interchangeable.

Q: Why do Vishay parts show different forward voltage specifications?

A: Vishay parts specify forward voltage at different test conditions (450 mV @ 15 mA for BAT43 series; 650 mV @ 50 mA for BAT42 series) compared to the original BAT43W-7 (1 V @ 200 mA). These represent different measurement points on the same diode characteristic curve and do not indicate incompatibility. All parts maintain the same reverse voltage, current rating, and switching speed.

Q: Does the reduced capacitance in Vishay parts (7 pF versus 10 pF) affect circuit performance?

A: The capacitance difference falls within the allowable parameter range for Schottky rectifier substitution. Both values are acceptable for small-signal switching applications at the specified frequency (1 MHz). Circuit performance impact is negligible for standard rectification and switching applications.

Q: Are Last Time Buy parts suitable for new designs?

A: Last Time Buy parts (BAT42W-HE3-08 and BAT43W-HE3-08) are available in current inventory but have limited future production. These parts are suitable for existing production runs but not recommended for new design starts. Active production alternatives (BAT42W-E3-08, BAT42W-E3-18, BAT42W-G3-08, BAT43W-E3-08, BAT43W-E3-18, BAT43W-G3-18) are preferred for long-term availability.

Q: What packaging options are available?

A: All substitute parts are supplied in SOD-123 surface mount package, matching the original BAT43W-7. Packaging variations include Cut Tape (CT), Tape & Reel (TR), and Digi-Reel® formats. These represent different distribution methods for the same component and do not affect electrical or mechanical compatibility.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance requirements depend on end-use application and regional regulations. All listed substitute parts are ROHS3 compliant, eliminating compliance risk for new designs and manufacturing. The original BAT43W-7 is RoHS non-compliant and may face restrictions in certain markets.

Q: Can I mix different substitute parts in the same production run?

A: Yes. All listed substitute parts maintain identical electrical specifications within the allowed parameter ranges. Mixing parts from different manufacturers or series (BAT42 versus BAT43) in the same circuit is acceptable. However, maintaining consistent sourcing from a single part number is recommended for manufacturing traceability and quality control.

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