ACDBC540-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The ACDBC540-HF is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 5A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain constraints, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 5 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Capacitance @ Vr, F	300	pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 125	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Technology	Schottky	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ACDBC540-HF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40V
Current - Average Rectified (Io): Must equal or exceed 5A
Technology: Schottky (fast recovery diode)
Package / Case: DO-214AB, SMC (surface mount mechanical compatibility)
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max): Lower values preferred for efficiency
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature Range: Must accommodate application requirements
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitution Classification:

The identified substitute parts fall into two categories based on current rating:

Full Current Rating Substitutes (5A): Parts meeting or exceeding the 5A current requirement with 40V voltage rating maintain complete electrical equivalence.
Reduced Current Rating Substitutes (3A): Parts with 3A current rating are listed as substitutes only when application current requirements do not exceed 3A. These parts maintain 40V voltage rating and DO-214AB package compatibility but operate at reduced current capacity.
Voltage-Reduced Substitutes (20V): Parts with 20V voltage rating are substitutes only for applications where the reverse voltage stress does not exceed 20V, despite package and current compatibility.

Parameter Comparison

Parameter	ACDBC540-HF (Main)	B340-13-F	MBRS320T3G	STPS340SY
Manufacturer	Comchip Technology	Diodes Incorporated	onsemi	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	20 V	40 V
Current - Average Rectified (Io)	5 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 5 A	500 mV @ 3 A	500 mV @ 3 A	630 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V	500 µA @ 40 V	2 mA @ 20 V	20 µA @ 40 V
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 125 °C	-55 to 125 °C	-65 to 150 °C	-40 to 150 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Automotive	—	—	Automotive
Qualification	AEC-Q101	—	—	AEC-Q101

Engineering Selection Recommendations

B340-13-F (Diodes Incorporated): This part maintains 40V voltage rating and DO-214AB package compatibility with the ACDBC540-HF. The current rating is reduced to 3A. Selection is appropriate for applications where circuit current does not exceed 3A. Forward voltage is lower (500 mV @ 3A vs. 550 mV @ 5A), providing improved efficiency characteristics. Product status is Active with ROHS3 compliance. No automotive qualification is specified.

MBRS320T3G (onsemi): This part features reduced voltage rating (20V) and reduced current rating (3A) compared to the ACDBC540-HF. Selection is appropriate only for applications where reverse voltage stress does not exceed 20V and circuit current does not exceed 3A. Operating temperature range extends to -65°C to 150°C, providing broader thermal coverage. Product status is Active with ROHS3 compliance. No automotive qualification is specified.

STPS340SY (STMicroelectronics): This part maintains 40V voltage rating and DO-214AB package compatibility with the ACDBC540-HF. The current rating is reduced to 3A. Selection is appropriate for applications where circuit current does not exceed 3A. Forward voltage is higher (630 mV @ 3A), resulting in increased power dissipation compared to the main part. Product status is Active with AEC-Q101 automotive qualification and ROHS3 compliance, matching the automotive grade of the ACDBC540-HF.

Frequently Asked Questions (FAQ)

Q: Can B340-13-F replace ACDBC540-HF in all applications?

A: No. B340-13-F has a reduced current rating of 3A versus 5A for the ACDBC540-HF. Substitution is valid only when the application circuit current does not exceed 3A. Voltage rating (40V) and package (DO-214AB, SMC) are compatible.

Q: What is the primary limitation of MBRS320T3G as a substitute?

A: MBRS320T3G has both reduced voltage rating (20V) and reduced current rating (3A). Substitution is valid only for applications where reverse voltage stress does not exceed 20V and circuit current does not exceed 3A. This part is not suitable for general replacement of the ACDBC540-HF.

Q: How does STPS340SY compare to ACDBC540-HF in terms of automotive qualification?

A: Both ACDBC540-HF and STPS340SY carry AEC-Q101 automotive qualification and Automotive grade designation. STPS340SY is suitable for automotive applications. However, current rating is reduced to 3A, limiting substitution to circuits with current ≤ 3A.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts (B340-13-F, MBRS320T3G, STPS340SY) use DO-214AB (SMC) surface mount package, providing mechanical compatibility with ACDBC540-HF for PCB layout and assembly.

Q: What is the impact of forward voltage differences among these parts?

A: Forward voltage varies: ACDBC540-HF (550 mV @ 5A), B340-13-F (500 mV @ 3A), MBRS320T3G (500 mV @ 3A), STPS340SY (630 mV @ 3A). Lower forward voltage reduces power dissipation and heat generation. STPS340SY exhibits higher forward voltage, requiring thermal design consideration if substituted.

Q: Can ACDBC540-HF be used in place of any of the substitute parts?

A: ACDBC540-HF can replace any of the listed substitute parts where the application requirements do not exceed the substitute part's electrical ratings. The main part's higher current rating (5A) and equivalent voltage rating (40V for B340-13-F and STPS340SY) provide design margin.

Q: What is the moisture sensitivity level for all these parts?

A: All parts (ACDBC540-HF, B340-13-F, MBRS320T3G, STPS340SY) have Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: Are there temperature range differences that affect substitution?

A: Yes. ACDBC540-HF operates -55°C to 125°C, B340-13-F operates -55°C to 125°C, MBRS320T3G operates -65°C to 150°C, and STPS340SY operates -40°C to 150°C. Applications requiring operation below -55°C or above 125°C may require MBRS320T3G or STPS340SY, subject to voltage and current rating constraints.

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