BAT400D-7 Equivalent & Substitute Parts

Part Overview

The BAT400D-7 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 500 mA average rectified current in a surface mount SOT-23-3 package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The BAT400D-7 features fast recovery characteristics with reverse recovery time ≤ 500 ns for currents greater than 200 mA, making it suitable for high-frequency switching applications. Equivalent and substitute parts must maintain compatibility across voltage rating, current capacity, package form factor, and thermal operating range to ensure direct replacement capability.

Key Parameters

Parameter	BAT400D-7 Specification
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	500 mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 500 mA
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	50 µA @ 30 V
Capacitance @ Vr, F	125 pF @ 0 V, 1 MHz
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Operating Temperature - Junction	-40°C ~ 125°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the BAT400D-7 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 40 V or greater to ensure safe operation within the original circuit design.

Current Capacity: The average rectified current (Io) must equal or exceed 500 mA. Parts with lower current ratings (120 mA, 200 mA) are not direct substitutes and are listed for reference only where voltage and package compatibility exist.

Package Compatibility: All substitute parts must use the TO-236-3, SC-59, or SOT-23-3 package designation to ensure mechanical and electrical compatibility with existing PCB layouts.

Speed Classification: Fast recovery diodes (≤ 500 ns, > 200 mA) are preferred for direct substitution to maintain switching performance characteristics. Small signal diodes are listed where voltage and current ratings align but with different speed classifications.

Thermal Operating Range: The junction temperature rating must support the original operating range of -40°C to 125°C or higher.

Compliance Status: RoHS3 compliance and active product status are preferred for long-term availability and regulatory alignment.

Substitute parts are grouped into two categories: Direct Equivalents (matching all critical parameters) and Functional Alternatives (matching voltage, current, and package with acceptable parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Package	Tj (Max)	Product Status	RoHS Status
BAT400D-7	Diodes Incorporated	40 V	500 mA	550 mV @ 500 mA	Fast Recovery ≤ 500 ns	SOT-23-3	125°C	Discontinued	RoHS Non-Compliant
BAT400D-7-F	Diodes Incorporated	40 V	500 mA	550 mV @ 500 mA	Fast Recovery ≤ 500 ns	SOT-23-3	125°C	Active	RoHS3 Compliant
BAT720,215	Nexperia USA Inc.	40 V	500 mA	550 mV @ 500 mA	Fast Recovery ≤ 500 ns	SOT-23-3	125°C	Active	RoHS3 Compliant
BAT720,235	Nexperia USA Inc.	40 V	500 mA	550 mV @ 500 mA	Fast Recovery ≤ 500 ns	SOT-23-3	125°C	Active	RoHS3 Compliant
PMEG4005ET,215	Nexperia USA Inc.	40 V	500 mA	470 mV @ 500 mA	Fast Recovery ≤ 500 ns	SOT-23-3	150°C	Active	RoHS3 Compliant
PMEG4010ET,215	Nexperia USA Inc.	40 V	1 A	640 mV @ 1 A	Fast Recovery ≤ 500 ns	SOT-23-3	150°C	Active	RoHS3 Compliant
BAS40,215	Nexperia USA Inc.	40 V	120 mA	1 V @ 40 mA	Small Signal ≤ 200 mA	SOT-23-3	150°C	Active	RoHS3 Compliant
BAS40,235	Nexperia USA Inc.	40 V	120 mA	1 V @ 40 mA	Small Signal ≤ 200 mA	SOT-23-3	150°C	Active	RoHS3 Compliant
BAT64E6327HTSA1	Infineon Technologies	40 V	120 mA	750 mV @ 100 mA	Small Signal ≤ 200 mA	SOT-23-3	150°C	Active	RoHS3 Compliant
BAT721,215	Nexperia USA Inc.	40 V	200 mA	550 mV @ 200 mA	Small Signal ≤ 200 mA	SOT-23-3	125°C	Active	RoHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred):

The BAT400D-7-F is the direct equivalent replacement for the discontinued BAT400D-7. Both parts share identical electrical specifications: 40 V reverse voltage, 500 mA average rectified current, 550 mV forward voltage at 500 mA, and fast recovery characteristics. The BAT400D-7-F is manufactured by Diodes Incorporated under active product status with RoHS3 compliance, providing regulatory alignment and long-term supply assurance. This part requires no circuit redesign or thermal management recalculation.

Primary Functional Alternatives (500 mA Current Rating):

BAT720,215 and BAT720,235 (Nexperia USA Inc.) are functionally equivalent alternatives with identical voltage, current, and speed ratings. Both parts maintain the 40 V / 500 mA / fast recovery specification and are available in active status with RoHS3 compliance. The primary difference is packaging format: BAT720,215 is supplied in Cut Tape (CT) & Digi-Reel format, while BAT720,235 is supplied in Tape & Reel (TR) format. Selection between these variants depends on procurement and assembly requirements.

PMEG4005ET,215 (Nexperia USA Inc.) meets the 40 V / 500 mA / fast recovery requirements with improved forward voltage characteristics (470 mV @ 500 mA versus 550 mV), resulting in lower power dissipation. This part features an elevated maximum junction temperature of 150°C, providing enhanced thermal margin. PMEG4005ET,215 is suitable for applications where reduced heat generation is beneficial.

PMEG4010ET,215 (Nexperia USA Inc.) exceeds the current requirement at 1 A average rectified current while maintaining 40 V reverse voltage and fast recovery speed. This part is suitable for applications requiring current margin or where future design scaling is anticipated. Forward voltage at rated current (640 mV @ 1 A) is higher than the original specification, requiring thermal analysis for high-frequency switching applications.

Secondary Alternatives (Reduced Current Rating):

BAT721,215 (Nexperia USA Inc.) provides 40 V reverse voltage with 200 mA average rectified current. This part is suitable only for applications where the circuit current demand does not exceed 200 mA. Forward voltage specification (550 mV @ 200 mA) matches the original part at its rated current.

BAS40,215 and BAS40,235 (Nexperia USA Inc.) and BAT64E6327HTSA1 (Infineon Technologies) are rated for 120 mA average rectified current with 40 V reverse voltage. These parts are not suitable for direct replacement in circuits requiring 500 mA operation. These alternatives are listed for reference in applications where current demand is significantly lower than the original design specification.

Frequently Asked Questions (FAQ)

Q: Can BAT400D-7-F be used as a direct replacement for BAT400D-7?

A: Yes. BAT400D-7-F is the direct equivalent manufactured by Diodes Incorporated with identical electrical specifications and package form factor. The primary difference is active product status and RoHS3 compliance. No circuit modifications are required.

Q: What is the difference between BAT720,215 and BAT720,235?

A: Both parts are electrically identical with 40 V / 500 mA / fast recovery specifications. The difference is packaging format: BAT720,215 is supplied in Cut Tape (CT) & Digi-Reel format for automated pick-and-place assembly, while BAT720,235 is supplied in Tape & Reel (TR) format. Selection depends on assembly equipment compatibility and procurement preferences.

Q: Can PMEG4005ET,215 replace BAT400D-7 in all applications?

A: PMEG4005ET,215 is functionally equivalent for voltage, current, and speed ratings. The improved forward voltage (470 mV @ 500 mA versus 550 mV) results in lower power dissipation and heat generation. The elevated maximum junction temperature (150°C versus 125°C) provides additional thermal margin. PMEG4005ET,215 is suitable for direct replacement in all applications where the original BAT400D-7 was specified.

Q: Why are BAS40 and BAT64 parts listed if they have lower current ratings?

A: BAS40,215, BAS40,235, and BAT64E6327HTSA1 are listed as reference alternatives for applications where circuit current demand is significantly lower than 500 mA. These parts share the 40 V reverse voltage rating and SOT-23-3 package but are not suitable for direct replacement in circuits designed for 500 mA operation. Use of these parts in 500 mA applications will result in device failure or thermal damage.

Q: What is the significance of RoHS3 compliance?

A: RoHS3 compliance indicates conformance to current European Union Restriction of Hazardous Substances regulations. The original BAT400D-7 is RoHS non-compliant, while all active substitute parts listed are RoHS3 compliant. For new designs and long-term supply assurance, RoHS3 compliant parts are preferred. Existing designs using the discontinued BAT400D-7 can transition to RoHS3 compliant equivalents without circuit modification.

Q: Can PMEG4010ET,215 be used in place of BAT400D-7?

A: PMEG4010ET,215 exceeds the current requirement at 1 A average rectified current while maintaining 40 V reverse voltage and fast recovery speed. This part is electrically compatible and suitable for direct replacement. The higher current rating provides design margin for future scaling. Forward voltage at rated current (640 mV @ 1 A) is higher than the original specification (550 mV @ 500 mA), requiring thermal analysis for high-frequency switching applications to ensure junction temperature remains within acceptable limits.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts listed use the TO-236-3, SC-59, or SOT-23-3 package designation, which are mechanically and electrically equivalent. These packages are interchangeable on standard PCB layouts without modification. Verify supplier device package designation during procurement to ensure correct tape format and reel specifications for assembly equipment compatibility.

Q: What is the difference between fast recovery and small signal diodes?

A: Fast recovery diodes (BAT400D-7, BAT720, PMEG4005, PMEG4010) are optimized for high-frequency switching applications with reverse recovery time ≤ 500 ns for currents greater than 200 mA. Small signal diodes (BAS40, BAT64) have reverse recovery time ≤ 200 mA and are optimized for low-current signal applications. Fast recovery diodes are required for the BAT400D-7 application; small signal alternatives are not suitable for direct replacement.

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