BAS40-7-F-31 Equivalent & Substitute Parts

Part Overview

The BAS40-7-F-31 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design and procurement requirements. Substitute parts must maintain electrical and mechanical compatibility while meeting current product availability and compliance standards.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 40 mA
Reverse Recovery Time (trr)	5 ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V
Capacitance @ Vr, F	5 pF @ 0 V, 1 MHz
Package / Case	TO-236-3, SC-59, SOT-23-3
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the BAS40-7-F-31 is determined by equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 200 mA
Voltage - Forward (Vf) (Max) @ If: 1 V @ 40 mA
Reverse Recovery Time (trr): 5 ns
Current - Reverse Leakage @ Vr: 200 nA @ 30 V
Capacitance @ Vr, F: 5 pF @ 0 V, 1 MHz

Mechanical Equivalence Criteria:

Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C ~ 125°C (minimum requirement)

Parts meeting all electrical and mechanical parameters are classified as direct substitutes. Product status and compliance certifications are secondary factors that support selection based on availability and regulatory requirements.

Parameter Comparison

Parameter	BAS40-7-F-31 (Main)	BAS40Q-7-F (Substitute)	CDBT-40-G (Substitute)
Manufacturer	Diodes Incorporated	Diodes Incorporated	Comchip Technology
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 40 mA	1 V @ 40 mA	1 V @ 40 mA
Reverse Recovery Time (trr)	5 ns	5 ns	5 ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	200 nA @ 30 V	200 nA @ 30 V
Capacitance @ Vr, F	5 pF @ 0 V, 1 MHz	5 pF @ 0 V, 1 MHz	5 pF @ 0 V, 1 MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C	-55°C ~ 125°C	125°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BAS40Q-7-F (Diodes Incorporated)

The BAS40Q-7-F is a parametric equivalent to the BAS40-7-F-31 with identical electrical and mechanical specifications. This part carries active product status and includes AEC-Q101 automotive qualification. It is supplied in Tape & Reel packaging with 10,069 units in stock. Selection of this part is supported by manufacturer continuity, automotive-grade qualification, and full compliance with ROHS3 and REACH requirements.

CDBT-40-G (Comchip Technology)

The CDBT-40-G is a parametric equivalent manufactured by Comchip Technology with identical electrical specifications and SOT-23-3 package compatibility. This part carries active product status and is supplied in Tape & Reel packaging with 716 units in stock. Full compliance with ROHS3 and REACH requirements is maintained. The operating temperature maximum is specified as 125°C without a minimum temperature specification in the provided data.

Both substitute parts satisfy all electrical and mechanical equivalence criteria. Selection between them is determined by supply chain requirements, procurement preferences, and application-specific qualification needs.

Frequently Asked Questions (FAQ)

Q: Can BAS40Q-7-F be used as a direct replacement for BAS40-7-F-31?

A: Yes. The BAS40Q-7-F meets all electrical parameters (40 V reverse voltage, 200 mA current, 1 V forward voltage, 5 ns recovery time, 200 nA leakage, 5 pF capacitance) and mechanical specifications (SOT-23-3 package, surface mount, -55°C to 125°C operating range) required for direct substitution. The primary difference is product status: BAS40Q-7-F is active while BAS40-7-F-31 is obsolete.

Q: What is the difference between BAS40Q-7-F and CDBT-40-G?

A: Both parts are parametric equivalents with identical electrical specifications and SOT-23-3 package compatibility. The primary differences are manufacturer (Diodes Incorporated versus Comchip Technology) and qualification status (BAS40Q-7-F includes AEC-Q101 automotive qualification). Operating temperature specifications differ: BAS40Q-7-F specifies -55°C to 125°C while CDBT-40-G specifies 125°C maximum only.

Q: Are there packaging differences between the main part and substitutes?

A: The BAS40-7-F-31 packaging type is not specified in the provided data. Both substitute parts are supplied in Tape & Reel (TR) packaging. All three parts use the SOT-23-3 package case. Verify packaging requirements for your procurement process.

Q: Do the substitute parts meet compliance requirements?

A: Yes. Both BAS40Q-7-F and CDBT-40-G are ROHS3 compliant, REACH unaffected, and carry Moisture Sensitivity Level 1 (unlimited). Both parts maintain the same compliance profile as the original BAS40-7-F-31.

Q: Which substitute part should be selected for automotive applications?

A: The BAS40Q-7-F includes AEC-Q101 automotive qualification, making it the specified choice for automotive applications. The CDBT-40-G does not include automotive qualification in the provided data.

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