BAR43 Equivalent & Substitute Parts

Part Overview

The BAR43 is a Schottky rectifier diode manufactured by onsemi, rated for 30 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The BAR43 serves applications requiring small-signal Schottky rectification with fast reverse recovery characteristics. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating modern active product availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	800 mV @ 100 mA	mV @ mA
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	500 nA @ 25 V	nA @ V
Operating Temperature - Junction (Max)	150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the BAR43 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 200 mA
Reverse Recovery Time (trr): 5 ns
Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount)
Technology: Schottky

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitute parts may vary within the range of 400 mV to 1 V at specified test conditions
Current - Reverse Leakage @ Vr: Substitute parts may range from 500 nA to 4 µA at specified test conditions
Operating Temperature - Junction: Substitute parts may extend the upper or lower temperature range
Capacitance @ Vr, F: Substitute parts may include this specification where the original does not

Substitute parts are grouped into two categories:

Direct Substitutes (Electrical Equivalents): Parts meeting all mandatory equivalence parameters with identical or superior electrical performance characteristics.

Similar Substitutes (Functional Equivalents): Parts meeting all mandatory equivalence parameters but with variations in secondary electrical characteristics (forward voltage, leakage current, or temperature range) that remain within acceptable operating margins for the BAR43 application class.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [mV @ mA]	trr [ns]	Ir @ Vr [nA/µA @ V]	Package	Product Status
BAR43	onsemi	30	200	800 @ 100	5	500 nA @ 25	SOT-23-3	Obsolete
BAT54LT1G	onsemi	30	200	800 @ 100	5	2 µA @ 25	SOT-23-3	Active
BAR43-TP	Micro Commercial Co	30	200	800 @ 100	5	500 nA @ 25	SOT-23-3	Active
BAR43FILM	STMicroelectronics	30	100	1000 @ 100	5	500 nA @ 30	SOT-23-3	Active
BAT54-7-F	Diodes Incorporated	30	200	800 @ 100	5	2 µA @ 25	SOT-23-3	Active
BAT54-E3-08	Vishay General Semiconductor - Diodes Division	30	200	800 @ 100	5	2 µA @ 25	SOT-23-3	Active
BAT54Q-13	Diodes Incorporated	30	200	800 @ 100	5	2 µA @ 25	SOT-23-3	Active
BAT54Q-7-F	Diodes Incorporated	30	200	800 @ 100	5	2 µA @ 25	SOT-23-3	Active
BAT54TA	Diodes Incorporated	30	200	400 @ 10	5	4 µA @ 25	SOT-23-3	Active
BAT54W,115	NXP Semiconductors	30	200	800 @ 100	5	2 µA @ 25	SOT-323	Active
BAT54_R1_00001	Panjit International Inc.	30	200	600 @ 100	5	2 µA @ 25	SOT-23-3	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

BAT54LT1G (onsemi), BAT54-7-F (Diodes Incorporated), BAT54-E3-08 (Vishay), BAT54Q-13 (Diodes Incorporated), and BAT54Q-7-F (Diodes Incorporated) provide direct electrical equivalence to the BAR43 across all mandatory parameters. These parts are manufactured by established semiconductor suppliers with active product status and ROHS3 compliance. BAT54Q-13 and BAT54Q-7-F include AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Secondary Substitutes (Functional Equivalence with Variations):

BAR43-TP (Micro Commercial Co) maintains identical electrical specifications to the BAR43, including the 500 nA reverse leakage characteristic, and is available in active product status. This part is suitable for direct replacement in existing designs.

BAT54_R1_00001 (Panjit International Inc.) provides functional equivalence with improved forward voltage performance (600 mV @ 100 mA versus 800 mV), reducing power dissipation in rectification applications.

BAT54TA (Diodes Incorporated) operates within specification but exhibits higher reverse leakage (4 µA @ 25 V) and lower forward voltage at reduced test current (400 mV @ 10 mA). This part is suitable for applications where forward voltage reduction is beneficial and leakage current tolerance is adequate.

Package Consideration:

BAT54W,115 (NXP Semiconductors) is electrically equivalent but uses SOT-323 packaging instead of SOT-23-3. This part is suitable only for designs where SOT-323 footprint compatibility exists or where PCB redesign is acceptable.

Current Rating Limitation:

BAR43FILM (STMicroelectronics) is rated for 100 mA average rectified current, below the 200 mA specification of the BAR43. This part is not suitable for applications requiring the full 200 mA current rating.

Frequently Asked Questions (FAQ)

Q: Can BAT54LT1G directly replace BAR43 in existing PCB designs?

A: Yes. BAT54LT1G is electrically equivalent to BAR43 across all mandatory parameters (30 V, 200 mA, 5 ns recovery time) and uses identical SOT-23-3 packaging. The part is pin-compatible and requires no circuit modifications.

Q: What is the difference between BAT54-7-F and BAT54Q-13?

A: Both parts are electrically identical with 30 V, 200 mA, and SOT-23-3 specifications. BAT54Q-13 includes AEC-Q101 automotive qualification and is supplied on Tape & Reel (TR) packaging. BAT54-7-F is supplied on Cut Tape (CT) & Digi-Reel® packaging. Selection depends on packaging format requirements and automotive qualification necessity.

Q: Why is BAR43FILM not recommended as a substitute?

A: BAR43FILM is rated for 100 mA average rectified current, which is 50% below the BAR43 specification of 200 mA. Using this part in applications requiring 200 mA operation would exceed the component's current rating and create reliability risk.

Q: Can BAT54W,115 replace BAR43?

A: BAT54W,115 is electrically equivalent but uses SOT-323 packaging instead of SOT-23-3. Direct PCB replacement is not possible without footprint modification. This part is suitable only if PCB redesign or adapter solutions are implemented.

Q: What is the significance of reverse leakage current variation among substitutes?

A: The BAR43 specifies 500 nA reverse leakage at 25 V. Substitute parts range from 500 nA to 4 µA. Higher leakage increases power dissipation at reverse bias conditions. For applications sensitive to leakage current, BAR43-TP (500 nA) or BAT54LT1G (2 µA) are preferred over BAT54TA (4 µA).

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The original BAR43 is obsolete and does not carry RoHS3 designation. Substitution with active parts ensures compliance with current environmental regulations.

Q: What packaging options are available for BAR43 substitutes?

A: Substitute parts are available in Cut Tape (CT) & Digi-Reel®, Bulk, and Tape & Reel (TR) packaging formats. Selection depends on procurement volume and assembly process requirements. SOT-23-3 package is standard across all recommended substitutes except BAT54W,115 (SOT-323).

Q: Can BAT54TA be used in high-temperature applications?

A: BAT54TA is rated for a maximum junction temperature of 125°C, which is 25°C below the BAR43 specification of 150°C. For applications operating near or above 125°C, alternative substitutes with 150°C ratings (BAT54LT1G, BAT54-7-F, BAT54-E3-08, BAT54Q-13, BAT54Q-7-F) are recommended.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message