SBAS40LT3G Equivalent & Substitute Parts

Part Overview

The SBAS40LT3G is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage with 120 mA average rectified current. The device is packaged in SOT-23-3 (TO-236) surface mount configuration and is classified as a small signal diode with switching speeds suitable for applications requiring fast recovery characteristics. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified to address supply chain requirements, design flexibility, and manufacturing continuity. Alternative devices meeting the same electrical specifications and package requirements enable component selection across multiple manufacturers and inventory sources.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	120	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 40 mA	V @ mA
Current - Reverse Leakage @ Vr	1	µA @ 25 V
Capacitance @ Vr, F	5	pF @ 1V, 1MHz
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SBAS40LT3G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 120 mA minimum
Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount compatibility)
Technology: Schottky diode
Mounting Type: Surface Mount

Parametric Equivalents are parts from the same manufacturer (onsemi) with identical electrical specifications and package designation. These parts are direct replacements with no design modifications required.

Similar Parts are devices from alternative manufacturers that meet or exceed the primary electrical specifications and use the same physical package. These parts may exhibit variations in secondary parameters such as reverse leakage current, forward voltage characteristics, or capacitance, but remain functionally compatible within the specified operating envelope.

Parts with voltage ratings below 40 V or current ratings below 120 mA are classified as lower-specification alternatives and are included only where they represent functional substitutes for reduced-stress applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If	Ir @ Vr [µA]	C @ Vr [pF]	Package	Product Status	Grade
SBAS40LT3G	onsemi	40	120	1 V @ 40 mA	1 @ 25 V	5 @ 1V, 1MHz	SOT-23-3	Active	Commercial
BAS40LT1G	onsemi	40	120	1 V @ 40 mA	1 @ 25 V	5 @ 1V, 1MHz	SOT-23-3	Active	Commercial
SBAS40LT1G	onsemi	40	120	1 V @ 40 mA	1 @ 25 V	5 @ 1V, 1MHz	SOT-23-3	Active	Commercial
BAS40,215	Nexperia USA Inc.	40	120	1 V @ 40 mA	10 @ 40 V	5 @ 0V, 1MHz	SOT-23-3	Active	Automotive (AEC-Q100)
BAS40,235	Nexperia USA Inc.	40	120	1 V @ 40 mA	10 @ 40 V	5 @ 0V, 1MHz	SOT-23-3	Active	Automotive (AEC-Q100)
BAS40-00-HE3-08	Vishay General Semiconductor - Diodes Division	40	200	1 V @ 40 mA	0.1 @ 30 V	5 @ 0V, 1MHz	SOT-23-3	Last Time Buy	Automotive (AEC-Q101)
BAT64E6327HTSA1	Infineon Technologies	40	120	0.75 V @ 100 mA	2 @ 30 V	6 @ 1V, 1MHz	SOT-23-3	Active	Automotive (AEC-Q101)
CBAT54 TR PBFREE	Central Semiconductor Corp	30	200	0.8 V @ 100 mA	2 @ 25 V	10 @ 1V, 1MHz	SOT-23-3	Active	Commercial
CMPSH-3 TR PBFREE	Central Semiconductor Corp	30	100	1 V @ 100 mA	0.5 @ 25 V	7 @ 1V, 1MHz	SOT-23-3	Active	Commercial
CMPSH-3E TR PBFREE	Central Semiconductor Corp	40	200	1 V @ 200 mA	0.5 @ 25 V	7 @ 1V, 1MHz	SOT-23-3	Active	Commercial
CMPSH05-4 TR PBFREE	Central Semiconductor Corp	40	500	0.47 V @ 500 mA	20 @ 10 V	50 @ 1V, 1MHz	SOT-23-3	Active	Commercial

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement):

BAS40LT1G and SBAS40LT1G from onsemi are parametric equivalents to SBAS40LT3G. These parts share identical electrical specifications, package designation, and manufacturing compliance. Selection between these three onsemi variants is determined by inventory availability and supply chain requirements. All three maintain active production status and RoHS3 compliance.

Automotive-Grade Alternatives:

BAS40,215 and BAS40,235 from Nexperia USA Inc. are automotive-qualified devices (AEC-Q100) with identical voltage and current ratings. These parts exhibit higher reverse leakage current (10 µA @ 40 V versus 1 µA @ 25 V) compared to the SBAS40LT3G. Selection of these parts is appropriate for applications requiring automotive qualification or where higher leakage tolerance is acceptable.

BAT64E6327HTSA1 from Infineon Technologies is automotive-qualified (AEC-Q101) with 40 V / 120 mA specifications. This device exhibits lower forward voltage (0.75 V @ 100 mA) and higher reverse leakage (2 µA @ 30 V). Automotive applications requiring AEC-Q101 qualification may select this part.

BAS40-00-HE3-08 from Vishay is automotive-qualified (AEC-Q101) with 40 V rating and 200 mA current capacity. This part is designated Last Time Buy status and should not be selected for new designs requiring long-term supply assurance.

Higher Current Capacity Alternatives:

CMPSH-3E TR PBFREE from Central Semiconductor Corp provides 40 V / 200 mA capability in SOT-23-3 package. This part accommodates higher current loads while maintaining the same voltage rating and package footprint.

CMPSH05-4 TR PBFREE from Central Semiconductor Corp provides 40 V / 500 mA capability. This device is suitable for applications requiring significantly higher current handling with the same package and voltage specification.

Lower Voltage Alternatives:

CBAT54 TR PBFREE and CMPSH-3 TR PBFREE from Central Semiconductor Corp are rated for 30 V maximum reverse voltage. These parts are suitable only for applications where the circuit operates at voltages not exceeding 30 V. Selection of these parts for 40 V circuits results in device overstress and is not permitted.

Frequently Asked Questions (FAQ)

Q: Can CBAT54 TR PBFREE or CMPSH-3 TR PBFREE be used as direct replacements for SBAS40LT3G?

A: No. CBAT54 TR PBFREE and CMPSH-3 TR PBFREE are rated for 30 V maximum reverse voltage, while SBAS40LT3G is rated for 40 V. Using a 30 V device in a 40 V circuit results in device overstress and failure. These parts are suitable only for circuits operating at 30 V or below.

Q: What is the difference between BAS40LT1G and SBAS40LT3G?

A: BAS40LT1G and SBAS40LT3G are parametric equivalents from onsemi with identical electrical specifications and package designation. The difference in part number suffix (LT1G versus LT3G) reflects manufacturing date code or internal revision tracking. Both parts are suitable for direct substitution.

Q: Are Nexperia BAS40,215 and BAS40,235 suitable for non-automotive applications?

A: Yes. BAS40,215 and BAS40,235 are automotive-qualified parts (AEC-Q100) but are suitable for use in commercial applications. Automotive qualification indicates enhanced reliability and process control; these characteristics do not restrict use in non-automotive circuits. Selection is based on availability and design requirements.

Q: What is the significance of the higher reverse leakage current in Nexperia and Infineon parts?

A: Reverse leakage current represents the small current flowing through the diode when reverse-biased. Nexperia parts exhibit 10 µA @ 40 V, while onsemi SBAS40LT3G exhibits 1 µA @ 25 V. Higher leakage increases power dissipation in high-impedance circuits. For most applications, this difference is negligible. Selection should consider circuit sensitivity to leakage current.

Q: Can CMPSH-3E TR PBFREE (200 mA) be used in place of SBAS40LT3G (120 mA)?

A: Yes. CMPSH-3E TR PBFREE is rated for 40 V / 200 mA, which exceeds the 40 V / 120 mA specification of SBAS40LT3G. The higher current rating provides additional design margin and is suitable for direct substitution. The device occupies the same SOT-23-3 package footprint.

Q: Why is BAS40-00-HE3-08 marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this product. New designs should not incorporate this part. Existing designs using BAS40-00-HE3-08 should transition to active alternatives such as BAS40LT1G, SBAS40LT1G, or automotive-qualified equivalents.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed in this reference are RoHS3 compliant and carry unlimited moisture sensitivity rating (MSL 1). All parts are suitable for lead-free soldering processes and meet current environmental regulations.

Q: What is the difference between SOT-23-3 and TO-236-3 package designations?

A: SOT-23-3 and TO-236-3 are equivalent package designations for the same three-lead surface mount package. SC-59 is an alternative designation for the same package. All substitute parts in this reference use physically and electrically compatible packages suitable for direct PCB footprint replacement.

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