BAT54T Equivalent & Substitute Parts

Part Overview

The BAT54T is a Schottky diode manufactured by onsemi, rated for 30 V DC reverse voltage and 200 mA average rectified current in a SOT-23-3 surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BAT54T serves as a small-signal Schottky rectifier suitable for applications requiring fast switching characteristics and low forward voltage drop.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	V
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	2	µA @ 25 V
Capacitance @ Vr, F	10	pF @ 1V, 1MHz
Package / Case	SOT-23-3	-
Operating Temperature - Junction (Max)	125	°C
Technology	Schottky	-
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitution of the BAT54T is determined by electrical and mechanical parameter alignment within the Schottky diode category. The critical parameters governing substitution are:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 200 mA
Reverse Recovery Time (trr): 5 ns
Technology: Schottky

Mechanical Parameters:

Mounting Type: Surface Mount
Package compatibility considerations

Substitute parts are grouped into two categories:

Category 1: Package-Compatible Substitutes (SOT-23-3) Parts maintaining identical SOT-23-3 packaging with matching electrical specifications. These include BAT54-G, BAT54-HF, CDBT-54-G, and CDBT-54-HF from Comchip Technology, all rated for 30 V, 200 mA, with 5 ns reverse recovery time.

Category 2: Parametric Equivalents with Alternative Packaging Parts meeting all electrical specifications but utilizing different surface mount packages. BAT54WT1G (SC-70-3 package) and BAT54W-E3-08 (SOD-123 package) maintain electrical equivalence while offering alternative form factors.

Parameter Comparison

Parameter	BAT54T (onsemi)	BAT54WT1G (onsemi)	BAT54W-E3-08 (Vishay)	BAT54-G (Comchip)	BAT54-HF (Comchip)	CDBT-54-G (Comchip)	CDBT-54-HF (Comchip)
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	800 mV @ 100 mA	800 mV @ 100 mA	1 V @ 100 mA	1 V @ 100 mA	1 V @ 100 mA	1 V @ 100 mA
Reverse Recovery Time (trr)	5 ns	5 ns	5 ns	5 ns	5 ns	5 ns	5 ns
Current - Reverse Leakage @ Vr	2 µA @ 25 V	2 µA @ 25 V	2 µA @ 25 V	2 mA @ 25 V	2 µA @ 25 V	2 µA @ 25 V	2 µA @ 25 V
Capacitance @ Vr, F	10 pF @ 1V, 1MHz	10 pF @ 1V, 1MHz	10 pF @ 1V, 1MHz	10 pF @ 1V, 1MHz	10 pF @ 1V, 1MHz	10 pF @ 1V, 1MHz	10 pF @ 1V, 1MHz
Package / Case	SOT-23-3	SC-70-3 (SOT323)	SOD-123	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Operating Temperature - Junction (Max)	125°C	125°C	125°C	125°C	125°C	125°C	125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Package Replacement (SOT-23-3):

BAT54-HF and CDBT-54-HF from Comchip Technology are the primary substitutes for the BAT54T. Both parts maintain identical SOT-23-3 packaging, matching electrical specifications, and active product status. BAT54-HF offers higher inventory availability (38,130 units) compared to CDBT-54-HF (1,114 units). Both are ROHS3 compliant with MSL 1 rating.

BAT54-G and CDBT-54-G are also SOT-23-3 compatible alternatives. BAT54-G exhibits a reverse leakage current specification of 2 mA at 25 V, which differs from the BAT54T specification of 2 µA at 25 V. This parameter variance requires circuit-level evaluation for applications sensitive to leakage current performance.

For Alternative Package Configurations:

BAT54WT1G (onsemi, SC-70-3 package) maintains onsemi manufacturer continuity and provides active product status. This part exhibits forward voltage of 800 mV at 100 mA, compared to 1 V for the BAT54T, and includes extended operating temperature range (-55°C to 125°C). SC-70-3 packaging is smaller than SOT-23-3, suitable for space-constrained applications.

BAT54W-E3-08 (Vishay, SOD-123 package) offers an alternative from a different manufacturer with equivalent electrical specifications and active status. SOD-123 packaging provides a different footprint option for PCB layout flexibility.

Compliance and Regulatory Considerations:

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status, matching the BAT54T regulatory profile. All parts carry EAR99 ECCN classification and identical HTSUS code (8541.10.0070).

Frequently Asked Questions (FAQ)

Q: Can BAT54-G be used as a direct replacement for BAT54T?

A: BAT54-G is electrically compatible in SOT-23-3 packaging with matching voltage and current ratings. However, BAT54-G specifies reverse leakage current of 2 mA at 25 V, whereas BAT54T specifies 2 µA at 25 V. Applications requiring low leakage performance should evaluate this parameter difference against circuit requirements.

Q: What is the difference between BAT54-HF and CDBT-54-HF?

A: Both parts are Comchip Technology Schottky diodes in SOT-23-3 packaging with identical electrical specifications (30 V, 200 mA, 5 ns reverse recovery time, 1 V forward voltage at 100 mA, 2 µA reverse leakage). The primary difference is inventory availability: BAT54-HF has 38,130 units in stock, while CDBT-54-HF has 1,114 units. Both are active products with ROHS3 compliance.

Q: Why does BAT54WT1G have a different forward voltage specification?

A: BAT54WT1G specifies 800 mV forward voltage at 100 mA, compared to 1 V for BAT54T. This represents a manufacturing characteristic difference between the SC-70-3 package variant and the SOT-23-3 package. Both values remain within acceptable Schottky diode performance ranges. Circuit designs should accommodate this specification variance if forward voltage drop is a critical parameter.

Q: Is BAT54WT1G suitable for applications requiring extended temperature operation?

A: BAT54WT1G specifies operating temperature range of -55°C to 125°C, compared to BAT54T maximum junction temperature of 125°C. BAT54WT1G is suitable for applications requiring low-temperature operation down to -55°C. All other electrical parameters remain equivalent.

Q: What packaging considerations apply when substituting BAT54W-E3-08?

A: BAT54W-E3-08 uses SOD-123 packaging, which differs from the BAT54T SOT-23-3 package. SOD-123 is a smaller form factor suitable for space-constrained designs. PCB footprint, land pattern, and assembly process compatibility must be evaluated before implementation. Electrical specifications remain equivalent across all parameters.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed (BAT54WT1G, BAT54W-E3-08, BAT54-G, BAT54-HF, CDBT-54-G, CDBT-54-HF) are ROHS3 compliant with MSL 1 rating, matching the BAT54T regulatory status. All parts are REACH unaffected and carry EAR99 ECCN classification.

Q: Which substitute offers the best inventory availability?

A: BAT54-HF from Comchip Technology offers the highest inventory availability with 38,130 units in stock. This part maintains SOT-23-3 packaging compatibility and identical electrical specifications to BAT54T, making it the preferred choice for high-volume procurement requirements.

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