BAS40LT3G Equivalent & Substitute Parts

Part Overview

The BAS40LT3G is a Schottky diode manufactured by onsemi, rated for 40 V reverse voltage and 120 mA average rectified current in a surface mount SOT-23-3 package. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure procurement availability for new production runs or design revisions.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the BAS40LT3G is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 120 mA
Voltage - Forward (Vf) (Max) @ If: 1 V @ 40 mA
Package / Case: TO-236-3, SC-59, SOT-23-3
Technology: Schottky
Mounting Type: Surface Mount

Parametric Equivalent Parts maintain identical electrical specifications and package form factor. These parts are direct functional replacements with no design modifications required.

Similar Parts share the same voltage and current ratings but may differ in package type (SOT-323 vs. SOT-23-3), current rating (200 mA vs. 120 mA), or reverse leakage characteristics. These parts require package-level compatibility verification before substitution.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Status	Ir @ Vr
BAS40LT3G	onsemi	40 V	120 mA	1 V @ 40 mA	SOT-23-3	Obsolete	1 µA @ 25 V
BAS40LT1G	onsemi	40 V	120 mA	1 V @ 40 mA	SOT-23-3	Active	1 µA @ 25 V
SBAS40LT1G	onsemi	40 V	120 mA	1 V @ 40 mA	SOT-23-3	Active	1 µA @ 25 V
SBAS40LT3G	onsemi	40 V	120 mA	1 V @ 40 mA	SOT-23-3	Active	1 µA @ 25 V
1PS70SB40,115	NXP Semiconductors	40 V	120 mA	1 V @ 40 mA	SOT-323	Active	10 µA @ 40 V
BAS40,215	Nexperia USA Inc.	40 V	120 mA	1 V @ 40 mA	SOT-23-3	Active	10 µA @ 40 V
BAS40,235	Nexperia USA Inc.	40 V	120 mA	1 V @ 40 mA	SOT-23-3	Active	10 µA @ 40 V
BAS40-00-E3-08	Vishay General Semiconductor	40 V	200 mA	1 V @ 40 mA	SOT-23-3	Active	100 nA @ 30 V
BAS40-7-F	Diodes Incorporated	40 V	200 mA	1 V @ 40 mA	SOT-23-3	Active	200 nA @ 30 V
BAS40W,115	Nexperia USA Inc.	40 V	120 mA	1 V @ 40 mA	SOT-323	Active	10 µA @ 40 V
BAT64E6327HTSA1	Infineon Technologies	40 V	120 mA	750 mV @ 100 mA	SOT-23-3	Active	2 µA @ 30 V

Engineering Selection Recommendations

Parametric Equivalent Selection (Direct Replacement):

The following parts are parametric equivalents of the BAS40LT3G and are suitable for direct substitution without circuit modification:

BAS40LT1G (onsemi): Active product status with identical electrical specifications and SOT-23-3 packaging. Recommended as primary replacement due to manufacturer continuity and high inventory availability (605,300 units).
SBAS40LT1G (onsemi): Active product status with identical electrical specifications and SOT-23-3 packaging. Alternative onsemi source with adequate inventory (26,763 units).
SBAS40LT3G (onsemi): Active product status with identical electrical specifications and SOT-23-3 packaging. Direct variant of the obsolete part with active production status and inventory availability (15,100 units).

Similar Part Selection (Package or Rating Variation):

The following parts share core voltage and current ratings but require compatibility assessment:

BAS40,215 and BAS40,235 (Nexperia USA Inc.): Identical electrical specifications and SOT-23-3 packaging. Automotive-grade qualification (AEC-Q100). Suitable for applications requiring automotive-level reliability.
BAS40-00-E3-08 (Vishay General Semiconductor) and BAS40-7-F (Diodes Incorporated): Higher current rating (200 mA vs. 120 mA) in SOT-23-3 package. Suitable for applications requiring increased current margin. Lower reverse leakage characteristics.
BAS40W,115 (Nexperia USA Inc.): Identical electrical specifications in SOT-323 package. Automotive-grade qualification (AEC-Q100). Requires PCB layout modification due to different package footprint.
1PS70SB40,115 (NXP Semiconductors): Identical electrical specifications in SOT-323 package. Requires PCB layout modification due to different package footprint.
BAT64E6327HTSA1 (Infineon Technologies): Automotive-grade qualification (AEC-Q101). Forward voltage specification differs (750 mV @ 100 mA vs. 1 V @ 40 mA). Suitable for applications where lower forward voltage is beneficial.

All recommended substitutes maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can BAS40LT1G be used as a direct replacement for BAS40LT3G?

A: Yes. BAS40LT1G is a parametric equivalent with identical voltage rating (40 V), current rating (120 mA), forward voltage specification (1 V @ 40 mA), and SOT-23-3 package. The primary difference is product status: BAS40LT1G is active while BAS40LT3G is obsolete. No circuit modifications are required.

Q: What is the difference between BAS40LT1G and SBAS40LT1G?

A: Both parts are parametric equivalents with identical electrical specifications and SOT-23-3 packaging. The "S" prefix in SBAS40LT1G indicates a variant designation from onsemi. Both are active products suitable for direct substitution.

Q: Can I use BAS40-7-F or BAS40-00-E3-08 as replacements?

A: These parts have a higher current rating (200 mA vs. 120 mA) while maintaining the same 40 V voltage rating and SOT-23-3 package. They are functionally compatible and provide additional current margin. No circuit modifications are required for applications operating within the original 120 mA specification.

Q: What is the difference between SOT-23-3 and SOT-323 packages?

A: SOT-23-3 and SOT-323 are different surface mount package types with different physical dimensions and PCB footprints. Parts in SOT-323 package (such as BAS40W,115 or 1PS70SB40,115) require different PCB layout and cannot be used as direct pin-compatible replacements for SOT-23-3 parts without PCB redesign.

Q: Are automotive-grade variants available?

A: Yes. BAS40,215, BAS40,235, and BAS40W,115 are automotive-grade parts with AEC-Q100 qualification. BAT64E6327HTSA1 carries AEC-Q101 qualification. These parts are suitable for applications requiring automotive-level reliability and traceability.

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

A: The BAS40LT3G specifies 1 µA reverse leakage at 25 V. Some alternatives specify higher leakage (10 µA @ 40 V) or lower leakage (100 nA @ 30 V). For most applications, these differences are not significant. Applications with strict leakage requirements should verify compatibility with the specific alternative part selected.

Q: Can I substitute BAT64E6327HTSA1 for BAS40LT3G?

A: BAT64E6327HTSA1 shares the same 40 V voltage rating, 120 mA current rating, and SOT-23-3 package. However, the forward voltage specification differs (750 mV @ 100 mA vs. 1 V @ 40 mA). This part is suitable for applications where lower forward voltage is beneficial or acceptable. Verify circuit performance with the lower forward voltage specification before substitution.

Q: What packaging options are available for replacement?

A: The primary packaging option is SOT-23-3 (TO-236-3, SC-59), which maintains pin compatibility with the original BAS40LT3G. Alternative packaging in SOT-323 is available from NXP Semiconductors and Nexperia USA Inc., but requires PCB redesign due to different footprint dimensions.

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