BAS40WQ-7-F Equivalent & Substitute Parts

Part Overview

The BAS40WQ-7-F is a Schottky diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage with 200 mA average rectified current in a surface mount SOT-323 package. This component is classified as Active product status and carries automotive-grade qualification under AEC-Q101 standard. Substitute parts are identified when equivalent electrical characteristics, mechanical compatibility, and regulatory compliance align with the original specification, enabling direct replacement in circuit applications without design modification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 40 mA	V
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	nA
Capacitance @ Vr, F	5 pF @ 0 V, 1 MHz	pF
Package / Case	SC-70, SOT-323	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the BAS40WQ-7-F are identified based on strict equivalence across the following critical parameters:

Voltage Rating: 40 V DC reverse voltage (Vr) maximum
Current Rating: 200 mA average rectified current (Io)
Forward Voltage: 1 V maximum at 40 mA forward current (Vf)
Reverse Recovery Time: 5 ns (trr)
Reverse Leakage Current: 200 nA at 30 V (Ir)
Capacitance: 5 pF at 0 V, 1 MHz
Package: SOT-323 surface mount configuration
Temperature Range: -55°C to 125°C junction operating temperature
Technology: Schottky diode classification

All substitute parts maintain identical electrical performance within these parameters and are compatible with existing PCB layouts and thermal management designs. Substitution is valid only when all parameters match the specified tolerances.

Parameter Comparison

Parameter	BAS40WQ-7-F	BAS40W-7-F	BAS40WQ-13-F
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Technology	Schottky	Schottky	Schottky
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	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Operating Temperature - Junction	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Packaging Type	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

BAS40W-7-F: This substitute part is electrically and mechanically identical to the BAS40WQ-7-F across all specified parameters. The primary distinction is the absence of automotive-grade qualification and AEC-Q101 certification on this variant. Selection of BAS40W-7-F is appropriate for non-automotive applications where automotive qualification is not a design requirement. Both parts maintain Active product status and full RoHS3 compliance.

BAS40WQ-13-F: This substitute part maintains complete electrical and mechanical equivalence to the BAS40WQ-7-F, including automotive-grade qualification and AEC-Q101 certification. The packaging difference (10K reel quantity versus 3K reel quantity) reflects only the tape reel configuration and does not affect component performance or compatibility. Selection of BAS40WQ-13-F is valid for automotive applications requiring AEC-Q101 qualification and is functionally interchangeable with the original part number.

All three part numbers are Active products with ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment across substitute selections.

Frequently Asked Questions (FAQ)

Q: Can BAS40W-7-F be used as a direct replacement for BAS40WQ-7-F in automotive applications?

A: No. BAS40W-7-F lacks automotive-grade qualification and AEC-Q101 certification. For automotive circuit designs requiring AEC-Q101 compliance, use BAS40WQ-13-F instead.

Q: Are BAS40WQ-7-F and BAS40WQ-13-F electrically identical?

A: Yes. Both parts are electrically identical across all specified parameters: 40 V reverse voltage, 200 mA current rating, 1 V forward voltage at 40 mA, 5 ns reverse recovery time, and identical thermal characteristics. The difference is packaging reel quantity (3K versus 10K).

Q: What is the significance of the SOT-323 package designation?

A: SOT-323 is the physical package standard for all three part numbers. This ensures mechanical and thermal compatibility on PCBs designed for this footprint. No layout modifications are required when substituting between these parts.

Q: Do all substitute parts operate across the same temperature range?

A: Yes. All three parts operate from -55°C to 125°C junction temperature, ensuring thermal performance equivalence in circuit applications.

Q: Are there differences in reverse leakage current between the substitute parts?

A: No. All three parts specify 200 nA reverse leakage current at 30 V, ensuring identical leakage performance in circuit operation.

Q: Can BAS40WQ-13-F be substituted for BAS40WQ-7-F in existing designs?

A: Yes. BAS40WQ-13-F is a direct functional equivalent with identical electrical specifications and automotive qualification. The only difference is the tape reel configuration (10K versus 3K), which does not affect component performance or PCB compatibility.

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