BAS40-7 Equivalent & Substitute Parts

Part Overview

The BAS40-7 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 discontinued at DiGi Electronics, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The BAS40-7 serves applications requiring low forward voltage drop and fast switching characteristics typical of Schottky diode rectifiers in power conversion and signal protection circuits.

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 @ 0 V, 1 MHz	pF @ V, MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the BAS40-7 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed 200 mA
Package / Case: Must be TO-236-3, SC-59, or SOT-23-3 for mechanical compatibility
Mounting Type: Must be Surface Mount
Technology: Must be Schottky

Secondary Compatibility Factors:

Forward voltage (Vf) characteristics
Reverse recovery time (trr)
Reverse leakage current
Operating temperature range
RoHS compliance status

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents — Parts with identical or superior electrical ratings and the same package footprint, enabling direct replacement without circuit modification.

Category 2: Functional Substitutes — Parts with equal or higher voltage and current ratings but with different electrical characteristics (forward voltage, leakage current, recovery time) that may require circuit evaluation depending on application sensitivity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If	trr [ns]	Ir @ Vr	Package	Product Status	RoHS Status
BAS40-7	Diodes Incorporated	40	200	1 V @ 40 mA	5	200 nA @ 30 V	SOT-23-3	Discontinued	Non-compliant
BAS40-7-F	Diodes Incorporated	40	200	1 V @ 40 mA	5	200 nA @ 30 V	SOT-23-3	Active	ROHS3 Compliant
BAS40,215	Nexperia USA Inc.	40	120	1 V @ 40 mA	—	10 µA @ 40 V	SOT-23-3	Active	ROHS3 Compliant
BAS40,235	Nexperia USA Inc.	40	120	1 V @ 40 mA	—	10 µA @ 40 V	SOT-23-3	Active	ROHS3 Compliant
BAS40E6327HTSA1	Infineon Technologies	40	120	1 V @ 40 mA	0.1	1 µA @ 30 V	SOT-23-3	Active	ROHS3 Compliant
BAS40E6433HTMA1	Infineon Technologies	40	120	1 V @ 40 mA	0.1	1 µA @ 30 V	SOT-23-3	Active	ROHS3 Compliant
BAS40LT1G	onsemi	40	120	1 V @ 40 mA	—	1 µA @ 25 V	SOT-23-3	Active	ROHS3 Compliant
BAT54FILM	STMicroelectronics	40	300	900 mV @ 100 mA	5	1 µA @ 30 V	SOT-23-3	Active	ROHS3 Compliant
BAT54FILMY	STMicroelectronics	40	300	900 mV @ 100 mA	5	1 µA @ 30 V	SOT-23-3	Active	ROHS3 Compliant
BAT64E6327HTSA1	Infineon Technologies	40	120	750 mV @ 100 mA	5	2 µA @ 30 V	SOT-23-3	Active	ROHS3 Compliant
BAT720,215	Nexperia USA Inc.	40	500	550 mV @ 500 mA	—	100 µA @ 35 V	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

BAS40-7-F is the primary equivalent substitute. This part is manufactured by Diodes Incorporated under the same base product number (BAS40) and maintains identical electrical specifications to the BAS40-7, including 40 V reverse voltage, 200 mA average rectified current, 1 V forward voltage at 40 mA, and 5 ns reverse recovery time. The BAS40-7-F is currently in active product status with ROHS3 compliance, addressing the discontinued status and regulatory requirements of the original part.

Functional Substitutes with Current Derating:

Parts rated for 120 mA average rectified current (BAS40,215; BAS40,235; BAS40E6327HTSA1; BAS40E6433HTMA1; BAS40LT1G; BAT64E6327HTSA1) are suitable for applications where the circuit design does not require the full 200 mA capability of the BAS40-7. These parts maintain the 40 V reverse voltage rating and SOT-23-3 package compatibility. Selection among these options depends on specific application requirements for reverse leakage current, forward voltage characteristics, and operating temperature range.

Higher Current Capacity Substitutes:

BAT54FILM and BAT54FILMY are rated for 300 mA average rectified current, exceeding the BAS40-7 specification. These parts are suitable for applications requiring higher current handling with the same 40 V reverse voltage and SOT-23-3 package. BAT720,215 provides 500 mA capacity but exhibits higher reverse leakage current (100 µA @ 35 V) compared to the BAS40-7 (200 nA @ 30 V), requiring circuit evaluation for leakage-sensitive applications.

Compliance Considerations:

All recommended substitute parts carry ROHS3 compliance status, addressing regulatory requirements. Parts with automotive qualification (BAS40,215; BAS40,235; BAT54FILMY; BAT64E6327HTSA1) are suitable for automotive and high-reliability applications requiring AEC-Q100 or AEC-Q101 certification.

Frequently Asked Questions (FAQ)

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

A: Yes. BAS40-7-F is a parametric equivalent with identical electrical specifications (40 V, 200 mA, 1 V forward voltage, 5 ns recovery time) and the same SOT-23-3 package. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 compliant versus non-compliant). No circuit modification is required.

Q: What is the difference between BAS40-7 and the 120 mA rated alternatives?

A: The BAS40-7 is rated for 200 mA average rectified current, while alternatives such as BAS40,215, BAS40E6327HTSA1, and BAS40LT1G are rated for 120 mA. These lower-rated parts are suitable only for applications where the circuit design does not exceed 120 mA. All maintain the same 40 V reverse voltage rating and SOT-23-3 package footprint.

Q: Are BAT54FILM and BAT54FILMY suitable replacements?

A: BAT54FILM and BAT54FILMY are functionally compatible with the BAS40-7 in terms of voltage rating (40 V) and package (SOT-23-3). However, they are rated for 300 mA, exceeding the BAS40-7 specification. These parts are suitable for applications where higher current capacity is beneficial or required. Forward voltage characteristics differ slightly (900 mV @ 100 mA versus 1 V @ 40 mA), which may affect circuit performance in voltage-sensitive applications.

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

A: Reverse leakage current varies among substitute parts. The BAS40-7 specifies 200 nA @ 30 V, while alternatives range from 1 µA to 100 µA depending on manufacturer and part number. Higher leakage current may impact circuit performance in precision analog applications, low-power standby circuits, or high-impedance signal paths. Applications with leakage-sensitive designs should select parts with comparable or lower leakage specifications.

Q: Can BAT720,215 replace BAS40-7 despite higher reverse leakage?

A: BAT720,215 provides 500 mA current capacity and maintains 40 V reverse voltage with SOT-23-3 package compatibility. However, reverse leakage current is specified at 100 µA @ 35 V, significantly higher than the BAS40-7 (200 nA @ 30 V). This part is suitable for applications where leakage current is not a design constraint. Circuit evaluation is required for applications sensitive to reverse leakage.

Q: What packaging considerations apply to these substitutes?

A: All listed substitute parts use the SOT-23-3 (TO-236-3, SC-59) surface mount package, ensuring mechanical and footprint compatibility with the BAS40-7. Differences exist in supplier device package designations (SOT-23-3, TO-236AB, PG-SOT23) and tape/reel configurations, but these do not affect circuit-level compatibility or PCB assembly.

Q: Are automotive-qualified alternatives available?

A: Yes. BAS40,215, BAS40,235, BAT54FILMY, and BAT64E6327HTSA1 carry automotive qualification (AEC-Q100 or AEC-Q101). These parts are suitable for automotive and high-reliability applications. However, most are rated for 120 mA, requiring current derating compared to the BAS40-7 specification.

Q: What is the operating temperature range difference?

A: The BAS40-7 operates from -55°C to 125°C. Most substitute parts extend the maximum junction temperature to 150°C, providing improved thermal margin. BAT720,215 is limited to 125°C maximum, matching the BAS40-7 specification. Applications with elevated operating temperatures benefit from substitutes with 150°C maximum ratings.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message