BAT54ALT1 Equivalent & Substitute Parts

Part Overview

The BAT54ALT1 is a Schottky diode array in a 1 Pair Common Anode configuration manufactured by onsemi. This component is rated for 30 V DC reverse voltage with 200 mA average rectified current per diode and features a maximum forward voltage of 800 mV at 100 mA. The BAT54ALT1 is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to support ongoing design requirements, procurement continuity, and system maintenance where this component is specified in existing applications.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Anode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io) (per Diode)	200 mA (DC)
Voltage - Forward (Vf) (Max) @ If	800 mV @ 100 mA
Reverse Recovery Time (trr)	5 ns
Current - Reverse Leakage @ Vr	2 µA @ 25 V
Operating Temperature - Junction	-55°C ~ 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the BAT54ALT1 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Diode Configuration: 1 Pair Common Anode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io) (per Diode): 200 mA (DC)
Reverse Recovery Time (trr): 5 ns

Mechanical Compatibility Requirements:

Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

Direct Equivalents: Parts that match all electrical parameters (30 V, 200 mA, 1 Pair Common Anode configuration, 5 ns recovery time) and package specifications. These parts are fully interchangeable with the BAT54ALT1 at the circuit level.

Functional Equivalents with Parameter Variance: Parts that maintain the same package, mounting type, and core Schottky technology but exhibit differences in specific electrical characteristics such as forward voltage, reverse leakage current, or maximum junction temperature. These parts are suitable for applications where the variance does not impact circuit performance.

Parameter Comparison

Part Number	Manufacturer	Diode Configuration	Vr (Max)	Io (per Diode)	Vf (Max) @ If	trr	Ir @ Vr	Tj (Max)	Package	Product Status	RoHS Status
BAT54ALT1	onsemi	1 Pair Common Anode	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	150°C	SOT-23-3	Obsolete	RoHS non-compliant
BAT54ALT1G	onsemi	1 Pair Common Anode	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	150°C	SOT-23-3	Active	ROHS3 Compliant
BAR43AFILM	STMicroelectronics	1 Pair Common Anode	30 V	100 mA	1 V @ 100 mA	5 ns	500 nA @ 30 V	150°C	SOT-23-3	Active	ROHS3 Compliant
BAT54-TP	Micro Commercial Co	Single Diode	30 V	200 mA	1 V @ 100 mA	5 ns	2 µA @ 25 V	125°C	SOT-23-3	Active	ROHS3 Compliant
BAT54A-E3-08	Vishay General Semiconductor - Diodes Division	1 Pair Common Anode	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	125°C	SOT-23-3	Active	ROHS3 Compliant
BAT54A-E3-18	Vishay General Semiconductor - Diodes Division	1 Pair Common Anode	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	125°C	SOT-23-3	Active	ROHS3 Compliant
BAT54A-G3-18	Vishay General Semiconductor - Diodes Division	1 Pair Common Anode	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	125°C	SOT-23-3	Active	ROHS3 Compliant
BAT54A-TP	Micro Commercial Co	1 Pair Common Anode	30 V	200 mA	1 V @ 100 mA	5 ns	2 µA @ 25 V	125°C	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BAT54ALT1G

The BAT54ALT1G is the direct equivalent replacement for the BAT54ALT1. This part is manufactured by onsemi, the original manufacturer of the BAT54ALT1, and maintains identical electrical specifications including 30 V reverse voltage, 200 mA average rectified current, 800 mV forward voltage at 100 mA, and 5 ns reverse recovery time. The BAT54ALT1G is classified as Active product status with ROHS3 compliance, providing long-term availability and regulatory alignment. This part is suitable for direct substitution in all applications where the BAT54ALT1 is specified.

Secondary Recommendations: BAT54A-E3-08, BAT54A-E3-18, BAT54A-G3-18

These Vishay General Semiconductor parts maintain the 1 Pair Common Anode configuration with identical electrical specifications (30 V, 200 mA, 800 mV forward voltage, 5 ns recovery time) and SOT-23-3 package. All three parts are Active status with ROHS3 compliance. The maximum junction temperature is specified at 125°C compared to 150°C for the BAT54ALT1, which is acceptable for applications operating within standard industrial temperature ranges. These parts are suitable for direct substitution where the lower maximum junction temperature does not constrain the application.

Alternative Recommendation: BAT54A-TP

The BAT54A-TP from Micro Commercial Co maintains the 1 Pair Common Anode configuration, 30 V reverse voltage, and 200 mA current rating in SOT-23-3 package. The forward voltage is specified at 1 V at 100 mA compared to 800 mV for the BAT54ALT1. This part is Active status with ROHS3 compliance and is suitable for applications where the higher forward voltage does not impact circuit performance.

Limited Recommendation: BAR43AFILM

The BAR43AFILM from STMicroelectronics is a 1 Pair Common Anode Schottky diode in SOT-23-3 package with 30 V reverse voltage rating. This part is rated for 100 mA average rectified current, which is 50% of the BAT54ALT1 specification. The BAR43AFILM is suitable only for applications where the circuit current requirement does not exceed 100 mA per diode. This part is Active status with ROHS3 compliance.

Not Recommended: BAT54-TP

The BAT54-TP from Micro Commercial Co is a single diode configuration, not a diode array. This part is not suitable for applications requiring the 1 Pair Common Anode configuration of the BAT54ALT1.

Frequently Asked Questions (FAQ)

Q: Can BAT54ALT1G be used as a direct replacement for BAT54ALT1?

A: Yes. The BAT54ALT1G is manufactured by onsemi and provides identical electrical specifications including 30 V reverse voltage, 200 mA average rectified current per diode, 800 mV forward voltage at 100 mA, and 5 ns reverse recovery time. Both parts use the SOT-23-3 package. The BAT54ALT1G is Active status with ROHS3 compliance, whereas the BAT54ALT1 is Obsolete and RoHS non-compliant.

Q: What is the difference between BAT54A-E3-08 and BAT54A-E3-18?

A: Both parts are manufactured by Vishay General Semiconductor and maintain identical electrical specifications. The designations E3-08 and E3-18 refer to different manufacturing date codes or tape reel configurations. From an electrical and functional perspective, these parts are equivalent and interchangeable.

Q: Can BAR43AFILM replace BAT54ALT1 in all applications?

A: No. The BAR43AFILM is rated for 100 mA average rectified current per diode, whereas the BAT54ALT1 is rated for 200 mA. The BAR43AFILM is suitable only for applications where the circuit current requirement does not exceed 100 mA per diode. Additionally, the forward voltage is specified at 1 V compared to 800 mV for the BAT54ALT1.

Q: Why is the maximum junction temperature different between substitute parts?

A: Different manufacturers specify different maximum junction temperatures based on their design and qualification standards. The BAT54ALT1 specifies 150°C maximum, while Vishay parts specify 125°C and Micro Commercial Co parts specify 125°C. For applications operating within standard industrial temperature ranges (-40°C to 85°C), this difference does not impact performance. Applications requiring operation near the upper temperature limit should verify compatibility with the specific substitute part's thermal specification.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant except the BAT54ALT1, which is RoHS non-compliant. If RoHS compliance is a requirement for your application, select from the Active status parts: BAT54ALT1G, BAR43AFILM, BAT54-TP, BAT54A-E3-08, BAT54A-E3-18, BAT54A-G3-18, or BAT54A-TP.

Q: What is the significance of the SOT-23-3 package specification?

A: The SOT-23-3 package (also designated TO-236-3 or SC-59) is a surface mount package with three leads. All listed substitute parts use this identical package, ensuring mechanical and electrical compatibility with PCB layouts designed for the BAT54ALT1. No PCB redesign is required when substituting parts within this package family.

Q: Can BAT54-TP be used instead of BAT54ALT1?

A: No. The BAT54-TP is a single diode configuration, not a diode array. The BAT54ALT1 is a 1 Pair Common Anode diode array with two diodes sharing a common anode connection. These are fundamentally different circuit configurations and are not interchangeable.

Q: What does "1 Pair Common Anode" configuration mean?

A: A 1 Pair Common Anode diode array contains two independent Schottky diodes with their anode terminals connected together internally. This configuration is used in applications requiring two diodes with a shared common connection, such as OR logic circuits or protection networks. The three leads of the SOT-23-3 package consist of the common anode and two separate cathode connections.

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