BAS40W-7 Equivalent & Substitute Parts

Part Overview

The BAS40W-7 is a Schottky diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-323 package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives within acceptable parameter ranges for the application category.

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 @ mA
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	nA @ V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	pF @ V, MHz
Technology	Schottky	—
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C

Substitute Part Grouping Explanation

Substitution of the BAS40W-7 is determined by the following critical parameters:

Electrical Specifications:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 200 mA minimum
Technology: Schottky diode
Speed Classification: Small Signal ≤ 200mA (Io), Any Speed

Mechanical Specifications:

Package / Case: SC-70, SOT-323
Mounting Type: Surface Mount
Supplier Device Package: SOT-323

Environmental & Compliance:

Operating Temperature - Junction: -55°C to 125°C minimum
Moisture Sensitivity Level (MSL): 1 (Unlimited)
RoHS Status: ROHS3 Compliant preferred

Parts are grouped into two categories:

Parametric Equivalents: Parts with identical electrical ratings (40 V, 200 mA) and identical package specifications, differing only in packaging format (Tape & Reel vs. bulk) or manufacturer variant codes.

Manufacturer Recommended Substitutes: Parts with the same reverse voltage (40 V) and SOT-323 package but with variations in current rating, forward voltage characteristics, or speed classification. These parts are functionally compatible within the application scope but require verification of current and thermal requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If	trr [ns]	Ir @ Vr	C @ Vr, F	Package	Product Status	RoHS Status
BAS40W-7	Diodes Incorporated	40	200	1 V @ 40 mA	5	200 nA @ 30 V	5 pF @ 0V, 1MHz	SOT-323	Discontinued	Non-compliant
BAS40W-7-F	Diodes Incorporated	40	200	1 V @ 40 mA	5	200 nA @ 30 V	5 pF @ 0V, 1MHz	SOT-323	Active	ROHS3 Compliant
BAS40WQ-13-F	Diodes Incorporated	40	200	1 V @ 40 mA	5	200 nA @ 30 V	5 pF @ 0V, 1MHz	SOT-323	Active	ROHS3 Compliant
BAS40WQ-7-F	Diodes Incorporated	40	200	1 V @ 40 mA	5	200 nA @ 30 V	5 pF @ 0V, 1MHz	SOT-323	Active	ROHS3 Compliant
BAS40WT-TP	Micro Commercial Co	40	200	1 V @ 40 mA	5	1 µA @ 30 V	5 pF @ 0V, 1MHz	SOT-323	Active	ROHS3 Compliant
BAT854W,115	Nexperia USA Inc.	40	200	550 mV @ 100 mA	—	500 nA @ 25 V	20 pF @ 1V, 1MHz	SOT-323	Active	ROHS3 Compliant
BAS40W,115	Nexperia USA Inc.	40	120	1 V @ 40 mA	—	10 µA @ 40 V	5 pF @ 0V, 1MHz	SOT-323	Active	ROHS3 Compliant
1PS70SB20,115	NXP Semiconductors	40	500	550 mV @ 500 mA	—	100 µA @ 35 V	90 pF @ 0V, 1MHz	SOT-323	Active	—
RB450FT106	Rohm Semiconductor	40	100	450 mV @ 10 mA	—	1 µA @ 10 V	6 pF @ 10V, 1MHz	SOT-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement):

BAS40W-7-F is the recommended direct replacement for BAS40W-7. This part maintains identical electrical specifications (40 V, 200 mA, 1 V forward voltage at 40 mA, 5 ns recovery time) and package configuration. BAS40W-7-F is manufactured by Diodes Incorporated with Active product status and ROHS3 compliance, addressing the discontinued status of the original part.

Automotive-Grade Equivalents:

BAS40WQ-13-F and BAS40WQ-7-F are parametric equivalents with AEC-Q101 automotive qualification. These parts maintain identical electrical specifications and SOT-323 packaging. Selection between these variants depends on tape reel quantity requirements (10K for BAS40WQ-13-F, 3K for BAS40WQ-7-F).

Alternative Manufacturer Equivalents:

BAS40WT-TP (Micro Commercial Co) provides identical electrical specifications with improved reverse leakage characteristics (1 µA @ 30 V vs. 200 nA @ 30 V) and extended operating temperature range (-55°C to 150°C). This part is ROHS3 compliant and Active status.

Functional Substitutes with Parameter Variations:

BAT854W,115 (Nexperia USA Inc.) maintains 40 V reverse voltage and 200 mA current rating but exhibits different forward voltage characteristics (550 mV @ 100 mA vs. 1 V @ 40 mA) and higher capacitance (20 pF @ 1V, 1MHz). This part is suitable for applications where forward voltage drop is not critical.

BAS40W,115 (Nexperia USA Inc.) is rated for 40 V and 120 mA, providing lower current capacity than the original specification. This part is suitable only for applications with current requirements not exceeding 120 mA.

1PS70SB20,115 (NXP Semiconductors) is rated for 40 V and 500 mA, providing higher current capacity. Forward voltage is specified at 550 mV @ 500 mA. This part is suitable for applications requiring higher current handling.

RB450FT106 (Rohm Semiconductor) is rated for 40 V and 100 mA, providing lower current capacity. This part is suitable only for applications with current requirements not exceeding 100 mA.

Compliance Considerations:

All recommended equivalents and substitutes are ROHS3 compliant except 1PS70SB20,115, which does not specify RoHS status. All parts maintain Moisture Sensitivity Level 1 (Unlimited) and REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can BAS40W-7-F be used as a direct replacement for BAS40W-7?

A: Yes. BAS40W-7-F is a parametric equivalent with identical electrical specifications (40 V reverse voltage, 200 mA current, 1 V forward voltage at 40 mA, 5 ns recovery time) and SOT-323 package. The primary difference is product status (Active vs. Discontinued) and RoHS compliance (ROHS3 vs. Non-compliant).

Q: What is the difference between BAS40WQ-13-F and BAS40WQ-7-F?

A: Both parts are parametric equivalents with identical electrical specifications and AEC-Q101 automotive qualification. The difference is tape reel quantity: BAS40WQ-13-F is supplied in 10K reel quantities, while BAS40WQ-7-F is supplied in 3K reel quantities.

Q: Can BAT854W,115 replace BAS40W-7 in all applications?

A: BAT854W,115 maintains the same 40 V reverse voltage and 200 mA current rating but has different forward voltage characteristics (550 mV @ 100 mA vs. 1 V @ 40 mA) and higher capacitance (20 pF vs. 5 pF). Substitution is valid only if the application circuit tolerates these parameter differences.

Q: Why is BAS40W,115 listed as a substitute if it has only 120 mA rating?

A: BAS40W,115 is listed as a manufacturer-recommended substitute but is suitable only for applications where the circuit current requirement does not exceed 120 mA. For applications requiring the full 200 mA specification, this part is not appropriate.

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

A: SOT-323 (also designated SC-70) is the surface mount package type. All listed equivalents and substitutes use this identical package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q: Are all substitute parts ROHS3 compliant?

A: All listed parts except 1PS70SB20,115 are specified as ROHS3 compliant. 1PS70SB20,115 does not specify RoHS status in the provided data. Verify RoHS compliance requirements for your application before selection.

Q: Can RB450FT106 be used as a substitute for BAS40W-7?

A: RB450FT106 maintains the 40 V reverse voltage and SOT-323 package but is rated for only 100 mA average rectified current. This part is suitable only for applications where circuit current does not exceed 100 mA.

Q: What is the difference between Tape & Reel and Bulk packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape for automated assembly processes. Bulk packaging supplies loose components. Both formats contain identical components; packaging format selection depends on manufacturing process requirements and order quantity.

Q: Should I select an automotive-grade part (BAS40WQ series) for non-automotive applications?

A: Automotive-grade parts (BAS40WQ-13-F, BAS40WQ-7-F) with AEC-Q101 qualification maintain identical electrical specifications to standard-grade equivalents. Selection is based on application requirements and supply chain preferences rather than technical necessity for non-automotive use.

Q: What is the operating temperature range difference between BAS40W-7 and BAS40WT-TP?

A: BAS40W-7 specifies -55°C to 125°C junction temperature. BAS40WT-TP specifies -55°C to 150°C junction temperature. BAS40WT-TP provides extended high-temperature operation capability.

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