BAT54 Schottky Diode Equivalent & Substitute Parts

Part Overview

The BAT54 is an obsolete Schottky 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. The part operates across a junction temperature range of -55°C to 150°C with a forward voltage of 800 mV at 100 mA and reverse recovery time of 5 ns. Due to its obsolete product status, equivalent and substitute parts from active manufacturers are necessary for new designs and production continuity. Suitable alternatives maintain the same electrical specifications and package form factor while offering active product status and current 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	2	µA @ 25 V
Capacitance @ Vr, F	10	pF @ 1V, 1MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the BAT54 is determined by strict equivalence across the following critical parameters: reverse voltage rating (30 V maximum), average rectified current (200 mA), forward voltage characteristics (800 mV at 100 mA), reverse recovery time (5 ns), reverse leakage current (2 µA at 25 V), and package form factor (SOT-23-3 / TO-236-3). Parts are grouped into three categories based on their relationship to the original BAT54 specification:

Direct Equivalents maintain all electrical parameters and differ only in product status (active versus obsolete) or packaging format (Cut Tape versus Tape & Reel). These parts are pin-compatible and electrically interchangeable without circuit modification.

Similar Parts share the same voltage and current ratings, package type, and core Schottky technology but may exhibit minor variations in secondary parameters such as reverse leakage current, capacitance, or forward voltage at different test conditions. These parts are functionally compatible for most applications but require verification of specific performance requirements.

Upgrade Parts meet or exceed the BAT54 electrical specifications while offering enhanced features such as automotive qualification (AEC-Q101), extended temperature ranges, improved reverse leakage characteristics, or availability from alternative manufacturers. These parts provide design flexibility and supply chain redundancy.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [mV @ mA]	trr [ns]	Ir @ Vr [µA @ V]	Package	Temp Range [°C]
BAT54	onsemi	Obsolete	30	200	800 @ 100	5	2 @ 25	SOT-23-3	-55 to 150
BAT54LT1G	onsemi	Active	30	200	800 @ 100	5	2 @ 25	SOT-23-3	-55 to 150
NSVBAT54LT1G	onsemi	Active	30	200	800 @ 100	5	2 @ 25	SOT-23-3	-55 to 125
BAT54-7-F	Diodes Incorporated	Active	30	200	800 @ 100	5	2 @ 25	SOT-23-3	-65 to 150
BAT54E6327HTSA1	Infineon Technologies	Active	30	200	800 @ 100	5	2 @ 25	SOT-23-3	-55 to 150
BAT54Q-13	Diodes Incorporated	Active	30	200	800 @ 100	5	2 @ 25	SOT-23-3	-65 to 150
BAT54TA	Diodes Incorporated	Active	30	200	400 @ 10	5	4 @ 25	SOT-23-3	-55 to 125
BAR43-TP	Micro Commercial Co	Active	30	200	800 @ 100	5	0.5 @ 25	SOT-23-3	-55 to 150
BAT43W	HY Electronic (Cayman) Limited	Active	30	200	1000 @ 200	5	0.5 @ 25	SOD-123	-55 to 125

Engineering Selection Recommendations

Direct Replacement (Preferred): BAT54LT1G from onsemi is the primary direct equivalent. It maintains identical electrical specifications to the BAT54 across all critical parameters, operates over the same temperature range (-55°C to 150°C), and is available in active product status with ROHS3 compliance. This part is suitable for direct substitution in existing designs without circuit modification.

Alternative from onsemi: NSVBAT54LT1G provides equivalent electrical performance with identical voltage, current, and switching characteristics. The maximum junction temperature is reduced to 125°C compared to the BAT54's 150°C rating. This part is supplied in Tape & Reel packaging format.

Cross-Manufacturer Alternatives: BAT54-7-F (Diodes Incorporated) and BAT54E6327HTSA1 (Infineon Technologies) both meet the BAT54 electrical specification and are available in active product status. BAT54-7-F extends the operating temperature range to -65°C to 150°C. BAT54E6327HTSA1 maintains the original temperature range and is supplied in Tape & Reel format.

Automotive-Qualified Option: BAT54Q-13 from Diodes Incorporated is AEC-Q101 qualified and suitable for automotive applications. It maintains all BAT54 electrical specifications and extends the lower operating temperature to -65°C. This part is recommended for designs requiring automotive-grade components.

Enhanced Performance Option: BAR43-TP from Micro Commercial Co offers superior reverse leakage characteristics (500 nA at 25 V versus 2 µA for the BAT54) while maintaining equivalent voltage and current ratings. This part is suitable for applications requiring lower leakage performance.

Package Variant: BAT43W from HY Electronic is available in SOD-123 package instead of SOT-23-3. This part exhibits higher forward voltage (1 V at 200 mA) and reduced maximum junction temperature (125°C) and is suitable only for applications where the SOD-123 package form factor is acceptable and forward voltage variation is tolerable.

Temperature-Constrained Applications: BAT54TA from Diodes Incorporated is limited to a maximum junction temperature of 125°C and exhibits higher forward voltage (400 mV at 10 mA) and reverse leakage (4 µA at 25 V). This part is suitable only for applications operating below 125°C where the specified forward voltage characteristics are acceptable.

Frequently Asked Questions (FAQ)

Q: Can BAT54LT1G be used as a direct replacement for BAT54?

A: Yes. BAT54LT1G is electrically and mechanically identical to BAT54 across all specified parameters. Both parts are rated for 30 V reverse voltage, 200 mA average rectified current, 800 mV forward voltage at 100 mA, and operate from -55°C to 150°C. The primary difference is product status: BAT54LT1G is active while BAT54 is obsolete. No circuit modification is required.

Q: What is the difference between BAT54LT1G and NSVBAT54LT1G?

A: Both parts are manufactured by onsemi and share identical electrical specifications. The primary difference is the maximum junction temperature: BAT54LT1G operates to 150°C while NSVBAT54LT1G is limited to 125°C. Additionally, NSVBAT54LT1G is supplied in Tape & Reel packaging while BAT54LT1G is available in Cut Tape & Digi-Reel format. Select NSVBAT54LT1G only if your application operates below 125°C and Tape & Reel packaging is required.

Q: Are BAT54-7-F and BAT54E6327HTSA1 suitable replacements?

A: Yes. Both parts meet the BAT54 electrical specification and are available from active manufacturers (Diodes Incorporated and Infineon Technologies respectively). BAT54-7-F extends the lower operating temperature to -65°C. BAT54E6327HTSA1 maintains the original -55°C to 150°C range. Both are pin-compatible with BAT54 in SOT-23-3 package and require no circuit modification.

Q: When should BAT54Q-13 be selected?

A: BAT54Q-13 is recommended for automotive applications requiring AEC-Q101 qualification. It maintains all BAT54 electrical specifications and extends the lower operating temperature to -65°C. Select this part when automotive-grade components are specified or when operation below -55°C is required.

Q: What is the advantage of BAR43-TP over BAT54?

A: BAR43-TP offers significantly lower reverse leakage current (500 nA at 25 V versus 2 µA for BAT54) while maintaining equivalent voltage and current ratings. This reduced leakage is beneficial in high-impedance circuits or applications sensitive to leakage current. All other electrical parameters remain equivalent.

Q: Can BAT43W be used as a substitute?

A: BAT43W is not recommended as a direct substitute. While it maintains the 30 V / 200 mA rating, it differs in three critical aspects: (1) package form factor is SOD-123 instead of SOT-23-3, requiring PCB layout modification; (2) forward voltage is 1 V at 200 mA versus 800 mV for BAT54, affecting circuit performance; (3) maximum junction temperature is 125°C versus 150°C. Use BAT43W only if SOD-123 package is required and forward voltage variation is acceptable.

Q: What is the difference between BAT54TA and other substitutes?

A: BAT54TA differs in three parameters: (1) forward voltage is specified at 400 mV at 10 mA (versus 800 mV at 100 mA for BAT54), making direct comparison difficult; (2) reverse leakage is 4 µA at 25 V versus 2 µA; (3) maximum junction temperature is 125°C versus 150°C. BAT54TA is suitable only for applications operating below 125°C where the specified forward voltage characteristics are acceptable.

Q: Which substitute offers the widest operating temperature range?

A: BAT54-7-F and BAT54Q-13 both extend the lower operating temperature to -65°C while maintaining the upper limit of 150°C, providing the widest operating range (-65°C to 150°C). The original BAT54 and most direct equivalents operate from -55°C to 150°C.

Q: Are all substitutes ROHS3 compliant?

A: All active substitutes listed (BAT54LT1G, NSVBAT54LT1G, BAT54-7-F, BAT54E6327HTSA1, BAT54Q-13, and BAT54TA) are ROHS3 compliant. BAR43-TP and BAT43W do not specify ROHS3 status in the provided data. Verify compliance requirements for your specific application.

Q: What packaging formats are available?

A: BAT54LT1G is supplied in Cut Tape (CT) & Digi-Reel format. NSVBAT54LT1G, BAT54E6327HTSA1, BAT54Q-13, and BAT54TA are supplied in Tape & Reel (TR) format. BAR43-TP is supplied in Bulk format. Select based on your procurement and assembly requirements.

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