BAS40,235 Equivalent & Substitute Parts

Part Overview

The BAS40,235 is a Schottky diode manufactured by Nexperia USA Inc., rated for 40 V DC reverse voltage and 120 mA average rectified current in a surface mount TO-236AB package. This component is classified as a small signal Schottky rectifier diode and is actively produced with AEC-Q100 automotive qualification. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements while maintaining electrical and mechanical compatibility within defined parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	120	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 40 mA	V @ mA
Current - Reverse Leakage @ Vr	10	µA @ 40 V
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Technology	Schottky
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the BAS40,235 are classified into three categories based on electrical parameter alignment:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 40 V reverse voltage, 120 mA average rectified current, 1 V forward voltage at 40 mA, 10 µA reverse leakage at 40 V, and 5 pF capacitance. These parts are direct functional replacements with no performance trade-offs.

Direct Manufacturer Equivalents share the same base part number (BAS40) and core electrical ratings but originate from different manufacturers. These parts meet the same voltage and current specifications and are packaged in compatible surface mount formats.

Similar Parts maintain the 40 V reverse voltage specification and surface mount packaging but differ in one or more of the following parameters: average rectified current (200 mA or higher), forward voltage characteristics, reverse leakage current, or reverse recovery time. These parts are suitable for applications where higher current capacity or different speed characteristics are acceptable or beneficial.

The key parameters determining substitution eligibility are:

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

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	Reverse Leakage @ Vr [µA or nA]	Capacitance @ Vr [pF]	Package	Tj (Max) [°C]	Product Status
BAS40,235	Nexperia USA Inc.	40	120	1 @ 40	10 µA @ 40 V	5 @ 0V, 1MHz	TO-236AB	150	Active
BAS40,215	Nexperia USA Inc.	40	120	1 @ 40	10 µA @ 40 V	5 @ 0V, 1MHz	TO-236AB	150	Active
BAS40LT1G	onsemi	40	120	1 @ 40	1 µA @ 25 V	5 @ 1V, 1MHz	SOT-23-3 (TO-236)	150	Active
BAS40-7-F	Diodes Incorporated	40	200	1 @ 40	200 nA @ 30 V	5 @ 0V, 1MHz	SOT-23-3	125	Active
BAS40-TP	Micro Commercial Co	40	200	1 @ 40	200 nA @ 30 V	5 @ 0V, 1MHz	SOT-23-3	125	Active
BAS40E6327HTSA1	Infineon Technologies	40	120	1 @ 40	1 µA @ 30 V	5 @ 0V, 1MHz	PG-SOT23	150	Active
BAS40E6433HTMA1	Infineon Technologies	40	120	1 @ 40	1 µA @ 30 V	5 @ 0V, 1MHz	PG-SOT23	150	Active
BAT1000-7-F	Diodes Incorporated	40	1000	500 mV @ 1 A	100 µA @ 30 V	175 @ 0V, 1MHz	SOT-23-3	125	Active
BAT400D-7-F	Diodes Incorporated	40	500	550 mV @ 500 mA	50 µA @ 30 V	125 @ 0V, 1MHz	SOT-23-3	125	Active
BAT54FILM	STMicroelectronics	40	300	900 mV @ 100 mA	1 µA @ 30 V	10 @ 1V, 1MHz	SOT-23-3	150	Active
BAT64E6327HTSA1	Infineon Technologies	40	120	750 mV @ 100 mA	2 µA @ 30 V	6 @ 1V, 1MHz	PG-SOT23	150	Active

Engineering Selection Recommendations

Parametric Equivalent Selection (BAS40,215)

The BAS40,215 from Nexperia USA Inc. is a parametric equivalent offering identical electrical specifications to the BAS40,235. Both parts maintain 40 V reverse voltage, 120 mA average rectified current, and 1 V forward voltage at 40 mA. Both are AEC-Q100 qualified for automotive applications and ROHS3 compliant. Selection of BAS40,215 is appropriate when supply availability of the BAS40,235 is constrained while maintaining identical performance characteristics.

Direct Manufacturer Equivalent Selection (BAS40LT1G)

The BAS40LT1G from onsemi provides direct functional equivalence with identical core electrical ratings: 40 V reverse voltage and 120 mA average rectified current. This part exhibits lower reverse leakage current (1 µA at 25 V versus 10 µA at 40 V) and is ROHS3 compliant. The operating temperature range extends to 150°C maximum junction temperature. BAS40LT1G is suitable for applications requiring onsemi component sourcing or where improved reverse leakage performance is beneficial.

Higher Current Capacity Selection (BAS40-7-F, BAS40-TP)

The BAS40-7-F from Diodes Incorporated and BAS40-TP from Micro Commercial Co both provide 200 mA average rectified current capacity while maintaining 40 V reverse voltage and 1 V forward voltage at 40 mA. These parts feature significantly lower reverse leakage (200 nA at 30 V) and are suitable for applications requiring higher current handling than the 120 mA specification. Maximum junction temperature is 125°C. These parts are appropriate when design margins for current capacity are required or when supply of the 120 mA variant is unavailable.

Automotive Grade Selection (BAS40E6327HTSA1, BAS40E6433HTMA1)

Both Infineon BAS40E6327HTSA1 and BAS40E6433HTMA1 maintain 40 V reverse voltage and 120 mA average rectified current with 1 V forward voltage at 40 mA. These parts feature 100 ps reverse recovery time and 1 µA reverse leakage at 30 V. Maximum junction temperature is 150°C. Both are ROHS3 compliant and suitable for automotive applications requiring Infineon component qualification.

Higher Current Alternatives (BAT1000-7-F, BAT400D-7-F, BAT54FILM)

These parts maintain the 40 V reverse voltage specification but provide significantly higher current capacity: BAT1000-7-F (1 A), BAT400D-7-F (500 mA), and BAT54FILM (300 mA). These are suitable only for applications where higher current handling is required and forward voltage characteristics are acceptable. Maximum junction temperature for these parts is 125°C (BAT1000-7-F and BAT400D-7-F) or 150°C (BAT54FILM).

Automotive Grade Higher Current Alternative (BAT64E6327HTSA1)

The BAT64E6327HTSA1 from Infineon maintains 40 V reverse voltage and 120 mA average rectified current with AEC-Q101 automotive qualification. Forward voltage is 750 mV at 100 mA. This part features 5 ns reverse recovery time and 2 µA reverse leakage at 30 V. Maximum junction temperature is 150°C. This part is appropriate for automotive applications where Infineon qualification is required.

Frequently Asked Questions (FAQ)

Q: Can BAS40,215 be used as a direct replacement for BAS40,235?

A: Yes. BAS40,215 is a parametric equivalent with identical electrical specifications: 40 V reverse voltage, 120 mA average rectified current, 1 V forward voltage at 40 mA, and 10 µA reverse leakage at 40 V. Both are manufactured by Nexperia USA Inc., AEC-Q100 qualified, and packaged in TO-236AB. No design changes are required.

Q: What is the difference between BAS40LT1G and BAS40,235?

A: BAS40LT1G is manufactured by onsemi and provides identical voltage and current ratings (40 V, 120 mA). The primary difference is lower reverse leakage current (1 µA at 25 V versus 10 µA at 40 V). Both are ROHS3 compliant and rated to 150°C maximum junction temperature. Package compatibility is maintained in SOT-23-3 format.

Q: When should BAS40-7-F or BAS40-TP be selected instead of BAS40,235?

A: BAS40-7-F and BAS40-TP provide 200 mA average rectified current capacity compared to 120 mA for BAS40,235. These parts are selected when the application requires higher current handling capability or when design margins for current are necessary. Both maintain 40 V reverse voltage and 1 V forward voltage at 40 mA. Maximum junction temperature is 125°C for both parts.

Q: Are all substitute parts compatible with the same PCB footprint?

A: All substitute parts listed use surface mount packaging in TO-236-3, SC-59, or SOT-23-3 formats. These packages share the same three-pin configuration and are mechanically compatible with standard SOT-23 PCB footprints. Verify specific footprint dimensions with component datasheets if required.

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

A: Reverse leakage current affects power consumption and circuit performance at high temperatures. BAS40,235 specifies 10 µA at 40 V. Substitute parts such as BAS40LT1G (1 µA at 25 V) and BAS40-7-F (200 nA at 30 V) exhibit lower leakage. Lower leakage is beneficial in low-power applications or high-temperature environments but is not required for all applications.

Q: Can BAT1000-7-F or BAT400D-7-F be used as substitutes for BAS40,235?

A: These parts maintain 40 V reverse voltage compatibility but provide significantly higher current capacity (1 A and 500 mA respectively versus 120 mA). They are suitable only if the application requires higher current handling. Forward voltage characteristics differ (500 mV at 1 A for BAT1000-7-F and 550 mV at 500 mA for BAT400D-7-F versus 1 V at 40 mA for BAS40,235). Maximum junction temperature is 125°C for both parts.

Q: What certifications apply to automotive applications?

A: BAS40,235 carries AEC-Q100 automotive qualification. Equivalent parts BAS40,215 and BAS40LT1G also carry AEC-Q100 qualification. Infineon parts BAS40E6327HTSA1 and BAS40E6433HTMA1 carry AEC-Q100 qualification. BAT64E6327HTSA1 carries AEC-Q101 qualification. All listed parts are ROHS3 compliant and REACH unaffected.

Q: How do reverse recovery time specifications affect part selection?

A: Reverse recovery time (trr) is specified for some substitute parts but not for BAS40,235. BAS40-7-F and BAS40-TP specify 5 ns trr. BAT54FILM specifies 5 ns trr. Infineon parts specify 100 ps trr. Lower reverse recovery time reduces switching losses in high-frequency applications. This parameter is not critical for low-frequency rectification applications.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in surface mount packaging. BAS40,235 is supplied in Tape & Reel (TR) format. Substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats depending on manufacturer. Verify packaging availability with component suppliers for specific procurement requirements.

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