BAT54A Equivalent & Substitute Parts

Part Overview

The BAT54A is a Schottky diode array in a 1 Pair Common Anode configuration, rated for 30 V DC reverse voltage and 200 mA average rectified current per diode. Manufactured by onsemi, this component is classified as obsolete, though it remains in stock with 1,430,400 units available. The BAT54A is housed in a SOT-23-3 (TO-236-3, SC-59) surface mount package and operates across a junction temperature range of -55°C to 150°C.

Due to the obsolete product status of the BAT54A, identifying equivalent and substitute parts is necessary for ongoing design support, production continuity, and long-term component availability. Active alternatives from multiple manufacturers provide functionally equivalent performance while offering current product status and compliance certifications.

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

Substitute Part Grouping Explanation

Substitute parts for the BAT54A are classified into three categories based on electrical and mechanical compatibility:

Direct Substitutes maintain identical electrical specifications across all critical parameters: 30 V reverse voltage rating, 200 mA average rectified current, 800 mV forward voltage at 100 mA, 5 ns reverse recovery time, 2 µA reverse leakage current, and SOT-23-3 package configuration. These parts are functionally interchangeable with the BAT54A and differ only in product status (active versus obsolete) and packaging format (Cut Tape, Digi-Reel, or Tape & Reel).

Upgrade Substitutes provide identical electrical performance to direct substitutes but originate from alternative manufacturers (Infineon Technologies and Diodes Incorporated). These parts meet or exceed the BAT54A specifications and carry active product status with RoHS3 compliance certification.

Similar Alternatives share the same diode configuration, technology, package, and mounting type but deviate in one or more electrical parameters. These parts are suitable only when application requirements permit relaxed voltage or current ratings. Similar alternatives include parts with higher voltage ratings (40 V) or reduced current ratings (100-120 mA).

The key parameters determining substitution eligibility are: diode configuration (1 Pair Common Anode), Schottky technology, reverse voltage rating (30 V minimum), average rectified current (200 mA minimum), forward voltage characteristics, reverse recovery time, and SOT-23-3 package format.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	trr	Ir @ Vr	Tj (Max)	Product Status	Package
BAT54A	onsemi	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	150°C	Obsolete	SOT-23-3
BAT54ALT1G	onsemi	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	150°C	Active	SOT-23-3
SBAT54ALT1G	onsemi	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	150°C	Active	SOT-23-3
SBAT54ALT3G	onsemi	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	150°C	Active	SOT-23-3
SBAS40-06LT1G	onsemi	40 V	120 mA	1 V @ 40 mA	Not specified	1 µA @ 25 V	150°C	Active	SOT-23-3
CDBT-54A-G	Comchip Technology	30 V	200 mA	1 V @ 100 mA	5 ns	2 µA @ 25 V	125°C	Active	SOT-23-3
BAT5406E6327HTSA1	Infineon Technologies	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	150°C	Active	SOT-23-3
BAT54A-7-F	Diodes Incorporated	30 V	200 mA	800 mV @ 100 mA	5 ns	2 µA @ 25 V	150°C	Active	SOT-23-3
BAT54ATA	Diodes Incorporated	30 V	200 mA	1 V @ 100 mA	5 ns	4 µA @ 25 V	125°C	Active	SOT-23-3
BAR43A-TP	Micro Commercial Co	30 V	200 mA	800 mV @ 100 mA	5 ns	500 nA @ 25 V	150°C	Active	SOT-23-3
BAR43AFILM	STMicroelectronics	30 V	100 mA	1 V @ 100 mA	5 ns	500 nA @ 30 V	150°C	Active	SOT-23-3

Engineering Selection Recommendations

Primary Direct Substitutes (Recommended for Drop-In Replacement)

BAT54ALT1G, SBAT54ALT1G, and SBAT54ALT3G from onsemi are the preferred direct substitutes. All three maintain identical electrical specifications to the BAT54A across voltage, current, forward voltage, and reverse recovery time parameters. These parts carry active product status and RoHS3 compliance. Selection between these three variants depends on packaging requirements: BAT54ALT1G is available in Cut Tape and Digi-Reel formats, while SBAT54ALT1G and SBAT54ALT3G are supplied in Tape & Reel format. Inventory availability is substantial across all three variants (27,300 to 155,200 units).

Alternative Manufacturers (Active Status, Full Compliance)

BAT5406E6327HTSA1 from Infineon Technologies and BAT54A-7-F from Diodes Incorporated provide identical electrical performance to the BAT54A with active product status. BAT5406E6327HTSA1 specifies a maximum junction temperature of 150°C, matching the BAT54A. BAT54A-7-F extends the operating temperature range to -65°C, providing enhanced low-temperature performance. Both parts carry RoHS3 compliance and are available in substantial quantities (106,480 and 407,200 units respectively).

Acceptable Alternatives with Minor Parameter Deviations

CDBT-54A-G from Comchip Technology maintains the 30 V / 200 mA electrical specification but specifies a maximum junction temperature of 125°C (versus 150°C for the BAT54A) and forward voltage of 1 V at 100 mA (versus 800 mV). This part is suitable for applications where the reduced temperature rating does not constrain thermal design margins.

BAT54ATA from Diodes Incorporated similarly specifies 125°C maximum junction temperature and 1 V forward voltage at 100 mA, with reverse leakage current of 4 µA at 25 V (versus 2 µA for the BAT54A). This part is acceptable where the increased leakage current does not impact circuit performance.

Similar Alternatives with Relaxed Specifications

SBAS40-06LT1G from onsemi provides higher voltage rating (40 V) but reduced current rating (120 mA per diode). This part is suitable only for applications where the 200 mA current requirement can be relaxed and the higher voltage rating provides design margin.

BAR43A-TP from Micro Commercial Co and BAR43AFILM from STMicroelectronics maintain the 30 V / 200 mA specification with improved reverse leakage characteristics (500 nA versus 2 µA). BAR43AFILM specifies 100 mA current rating and is suitable only where current requirements do not exceed this limit.

Frequently Asked Questions (FAQ)

Q: Can BAT54ALT1G, SBAT54ALT1G, and SBAT54ALT3G be used interchangeably with BAT54A?

A: Yes. These three onsemi variants maintain identical electrical specifications across all critical parameters: 30 V reverse voltage, 200 mA average rectified current, 800 mV forward voltage at 100 mA, 5 ns reverse recovery time, and 2 µA reverse leakage current. The differences are packaging format (Cut Tape/Digi-Reel versus Tape & Reel) and product status (active versus obsolete). Selection depends on procurement and assembly requirements.

Q: What is the difference between BAT54A-7-F and BAT5406E6327HTSA1?

A: Both parts provide identical electrical performance to the BAT54A. BAT54A-7-F from Diodes Incorporated extends the operating temperature range to -65°C (versus -55°C for the BAT54A), offering enhanced low-temperature capability. BAT5406E6327HTSA1 from Infineon Technologies maintains the -55°C to 150°C range. Both carry RoHS3 compliance and active product status. Selection depends on application temperature requirements and supplier preference.

Q: Can CDBT-54A-G be used as a direct replacement for BAT54A?

A: CDBT-54A-G from Comchip Technology maintains the 30 V / 200 mA electrical specification and SOT-23-3 package. However, it specifies a maximum junction temperature of 125°C (versus 150°C) and forward voltage of 1 V at 100 mA (versus 800 mV). This part is suitable for applications where thermal design margins accommodate the reduced temperature rating and where the higher forward voltage does not impact circuit performance.

Q: Why is BAR43AFILM not recommended as a direct substitute?

A: BAR43AFILM from STMicroelectronics specifies 100 mA average rectified current per diode, which is below the BAT54A rating of 200 mA. This part is suitable only for applications where current requirements do not exceed 100 mA. The 30 V reverse voltage rating and SOT-23-3 package are compatible, but the reduced current rating limits its use as a general replacement.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed carry RoHS3 compliance certification. The BAT54A, being obsolete, does not specify RoHS status. All substitute parts are REACH Unaffected and carry EAR99 export classification.

Q: What packaging formats are available for BAT54A substitutes?

A: Substitute parts are available in three packaging formats: Cut Tape (CT) & Digi-Reel (BAT54ALT1G, BAT54A-7-F, BAT54ATA), Tape & Reel (TR) (SBAT54ALT1G, SBAT54ALT3G, SBAS40-06LT1G, CDBT-54A-G, BAT5406E6327HTSA1), and Bulk (BAR43A-TP). Selection depends on assembly equipment and procurement volume requirements.

Q: Can SBAS40-06LT1G replace BAT54A in all applications?

A: SBAS40-06LT1G provides higher voltage rating (40 V) but reduced current rating (120 mA per diode). This part is suitable only for applications where the 200 mA current requirement can be relaxed. The higher voltage rating provides design margin for overvoltage conditions but does not compensate for the reduced current capacity.

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

A: Reverse leakage current varies among substitutes from 500 nA (BAR43A-TP, BAR43AFILM) to 4 µA (BAT54ATA). The BAT54A specifies 2 µA at 25 V. Higher leakage current increases power dissipation in reverse bias conditions and may impact circuit performance in high-impedance applications. Lower leakage current (500 nA) provides improved performance in sensitive circuits.

Q: Are there automotive-qualified alternatives to BAT54A?

A: SBAS40-06LT1G from onsemi carries AEC-Q101 automotive qualification. However, this part specifies 40 V / 120 mA ratings, which differ from the BAT54A. No automotive-qualified direct substitute with identical 30 V / 200 mA specifications is listed among the provided alternatives.

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