BAT54C Equivalent & Substitute Parts

Part Overview

The BAT54C is a Schottky diode array featuring one pair of common cathode configuration rated for 30 V DC reverse voltage and 200 mA average rectified current per diode. Manufactured by onsemi in SOT-23-3 surface mount package, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Suitable alternatives maintain identical electrical specifications and mechanical compatibility while offering active product status and continued availability.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BAT54C are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io) (per Diode): 200 mA
Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount
Reverse Recovery Time (trr): 5 ns

Direct Substitutes maintain all primary parameters with identical forward voltage characteristics (800 mV @ 100 mA) and reverse leakage specifications (2 µA @ 25 V). These parts are pin-compatible and electrically equivalent for direct replacement.

Similar Substitutes maintain all primary parameters but differ in one or more secondary characteristics such as forward voltage (1 V @ 100 mA), reverse leakage current (4 µA or 500 nA @ 25 V), or maximum junction temperature. These parts are functionally compatible but require verification of application-specific requirements.

Upgrade Substitutes maintain all primary parameters while offering enhanced specifications such as extended operating temperature range (-65°C ~ 150°C) or higher maximum junction temperature (150°C). These parts provide superior performance characteristics while maintaining full backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io (per Diode) [mA]	Vf (Max) @ If [mV]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Package
BAT54C	onsemi	Obsolete	30	200	800 @ 100 mA	5	2 @ 25 V	150	SOT-23-3
BAT54CLT1G	onsemi	Active	30	200	800 @ 100 mA	5	2 @ 25 V	125	SOT-23-3
BAT54CLT3G	onsemi	Active	30	200	800 @ 100 mA	5	2 @ 25 V	125	SOT-23-3
SBAT54CLT1G	onsemi	Active	30	200	800 @ 100 mA	5	2 @ 25 V	125	SOT-23-3
CDBT-54C-G	Comchip Technology	Active	30	200	1000 @ 100 mA	5	2 @ 25 V	125	SOT-23-3
BAT5405E6327HTSA1	Infineon Technologies	Active	30	200	800 @ 100 mA	5	2 @ 25 V	150	SOT-23-3
BAT54C-7-F	Diodes Incorporated	Active	30	200	800 @ 100 mA	5	2 @ 25 V	150	SOT-23-3
BAT54CTA	Diodes Incorporated	Active	30	200	1000 @ 100 mA	5	4 @ 25 V	125	SOT-23-3
BAR43C-TP	Micro Commercial Co	Active	30	200	800 @ 100 mA	5	500 nA @ 25 V	150	SOT-23-3
BAR43CFILM	STMicroelectronics	Active	30	100	1000 @ 100 mA	5	500 nA @ 30 V	150	SOT-23-3
BAS70-05FILM	STMicroelectronics	Active	70	70	1000 @ 15 mA	5	10 @ 70 V	150	SOT-23-3

Engineering Selection Recommendations

Direct Replacement (Preferred for Obsolete Part Mitigation):

BAT54CLT1G and BAT54CLT3G from onsemi provide direct electrical equivalence to the BAT54C with identical forward voltage (800 mV @ 100 mA) and reverse leakage (2 µA @ 25 V). Both parts maintain active product status and ROHS3 compliance. The primary difference is maximum junction temperature (125°C versus 150°C for the original part). These substitutes are suitable for applications where the operating temperature does not exceed 125°C.

Automotive-Grade Alternative:

SBAT54CLT1G from onsemi offers automotive qualification (AEC-Q101) with identical electrical specifications to BAT54CLT1G. This part is appropriate for automotive and industrial applications requiring enhanced reliability standards.

Extended Temperature Range Option:

BAT5405E6327HTSA1 from Infineon Technologies and BAT54C-7-F from Diodes Incorporated both maintain the original BAT54C maximum junction temperature of 150°C while providing active product status. These parts are suitable for applications requiring the full temperature operating range of the original component.

Alternative Manufacturers:

CDBT-54C-G from Comchip Technology and BAT54CTA from Diodes Incorporated provide functional equivalence with minor parameter variations. CDBT-54C-G exhibits higher forward voltage (1 V @ 100 mA). BAT54CTA exhibits higher forward voltage (1 V @ 100 mA) and higher reverse leakage (4 µA @ 25 V). Both parts are active and ROHS3 compliant.

Lower Leakage Alternative:

BAR43C-TP from Micro Commercial Co provides significantly lower reverse leakage (500 nA @ 25 V) compared to the BAT54C specification (2 µA @ 25 V) while maintaining all other primary parameters and 150°C maximum junction temperature.

Not Recommended for Direct Substitution:

BAR43CFILM from STMicroelectronics specifies 100 mA average rectified current, which is below the BAT54C 200 mA rating. BAS70-05FILM from STMicroelectronics specifies 70 V reverse voltage and 70 mA current, which differ significantly from BAT54C specifications. These parts are not suitable for direct replacement in applications requiring the full BAT54C electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can BAT54CLT1G directly replace the obsolete BAT54C?

A: Yes. BAT54CLT1G 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 maximum junction temperature is 125°C compared to 150°C for the original part. Direct replacement is suitable for applications operating within the 125°C temperature limit.

Q: What is the difference between BAT54CLT1G and BAT54CLT3G?

A: Both parts are electrically identical with the same specifications. The difference is in packaging format: BAT54CLT1G is supplied in Cut Tape (CT) & Digi-Reel format, while BAT54CLT3G is also supplied in Cut Tape (CT) & Digi-Reel format. Both are active products from onsemi with identical electrical performance.

Q: Why is SBAT54CLT1G designated as automotive-grade?

A: SBAT54CLT1G carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability and testing standards. This part is suitable for automotive applications requiring enhanced qualification documentation and reliability assurance.

Q: Can BAR43CFILM replace BAT54C?

A: No. BAR43CFILM specifies 100 mA average rectified current per diode, which is 50% of the BAT54C 200 mA specification. This part cannot handle the full current rating of the original component and is not suitable for direct replacement.

Q: Can BAS70-05FILM replace BAT54C?

A: No. BAS70-05FILM specifies 70 V reverse voltage and 70 mA average rectified current, both significantly different from BAT54C specifications (30 V, 200 mA). This part is not electrically compatible for direct substitution.

Q: What is the significance of the 800 mV versus 1 V forward voltage difference?

A: Forward voltage specifications of 800 mV versus 1 V represent the maximum voltage drop across the diode at 100 mA forward current. Parts with 1 V specification (CDBT-54C-G, BAT54CTA) exhibit higher forward voltage drop. In applications sensitive to voltage drop or power dissipation, the 800 mV specification is preferred. The 1 V specification remains within acceptable operating parameters for most general-purpose applications.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance status, consistent with the original BAT54C specification. This ensures compatibility with environmental and regulatory requirements.

Q: What packaging options are available for BAT54C substitutes?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and Bulk. All maintain the same SOT-23-3 (TO-236-3, SC-59) surface mount package footprint, ensuring mechanical compatibility with existing PCB designs.

Q: Which substitute offers the lowest reverse leakage current?

A: BAR43C-TP specifies 500 nanoamperes reverse leakage at 25 V, which is significantly lower than the BAT54C specification of 2 microamperes. This part is suitable for applications requiring minimal leakage current performance.

Q: Is the Infineon BAT5405E6327HTSA1 suitable for high-temperature applications?

A: Yes. BAT5405E6327HTSA1 maintains the original BAT54C maximum junction temperature of 150°C while providing active product status and identical electrical specifications. This part is appropriate for applications requiring extended temperature operation up to 150°C.

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