B340A-13-F-81 Equivalent & Substitute Parts

Part Overview

The B340A-13-F-81 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 3 A average rectified current in a surface mount SMA package (DO-214AC). This part is manufactured by Diodes Incorporated and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing design support, production continuity, and component sourcing. Substitute parts maintain the core electrical specifications while offering active availability and extended product support.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	—
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the B340A-13-F-81 is determined by the following core electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 500 mV @ 3 A
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Mounting Type: Surface Mount
Package / Case: DO-214AC, SMA (or compatible surface mount package)
Operating Temperature - Junction: -55°C to 150°C minimum
RoHS Status: ROHS3 Compliant

Substitution Categories:

Category 1: Direct Parametric Equivalents (Diodes Incorporated) Parts B340A-13-F, B340AE-13, B340AQ-13-F, and B340AX-13 are parametric equivalents from the same manufacturer. These parts share identical voltage, current, and forward voltage specifications. Differences exist in packaging format (Cut Tape, Tape & Reel), product status (Active vs. Obsolete), and secondary parameters such as reverse leakage current and capacitance. All maintain the required electrical performance envelope.

Category 2: Cross-Manufacturer Parametric Equivalents Parts SK34AHE3-LTP (Micro Commercial Co), CDBA340-G (Comchip Technology), SX34-AU_R1_000A1 (Panjit International Inc.), and SX34_R1_00001 (Panjit International Inc.) are from alternative manufacturers. These parts meet the primary electrical specifications and package requirements. Reverse leakage current and capacitance values vary within acceptable ranges for the application class.

Category 3: Package Variant (Manufacturer Recommended) Part SK34AE3/TR13 (Microsemi Corporation) is a manufacturer-recommended substitute with identical electrical specifications but uses the SMB package (DO-214AA) instead of SMA (DO-214AC). This part is suitable only when PCB layout and mechanical constraints permit SMB package substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Reverse Leakage @ Vr [µA @ 40V]	Package / Case	Product Status	Packaging Format
B340A-13-F-81	Diodes Incorporated	40	3	500 @ 3	500	DO-214AC, SMA	Obsolete	—
B340A-13-F	Diodes Incorporated	40	3	500 @ 3	500	DO-214AC, SMA	Active	Cut Tape (CT) & Digi-Reel®
B340AE-13	Diodes Incorporated	40	3	500 @ 3	200	DO-214AC, SMA	Active	Tape & Reel (TR)
B340AQ-13-F	Diodes Incorporated	40	3	500 @ 3	500	DO-214AC, SMA	Active	Tape & Reel (TR)
B340AX-13	Diodes Incorporated	40	3	500 @ 3	200	DO-214AC, SMA	Active	Tape & Reel (TR)
SK34AHE3-LTP	Micro Commercial Co	40	3	500 @ 3	100	DO-214AC, SMA	Active	Tape & Reel (TR)
CDBA340-G	Comchip Technology	40	3	500 @ 3	500	DO-214AC, SMA	Active	Tape & Reel (TR)
SX34-AU_R1_000A1	Panjit International Inc.	40	3	500 @ 3	200	DO-214AC, SMA	Active	Tape & Reel (TR)
SX34_R1_00001	Panjit International Inc.	40	3	500 @ 3	200	DO-214AC, SMA	Active	Cut Tape (CT) & Digi-Reel®
SK34AE3/TR13	Microsemi Corporation	40	3	500 @ 3	500	DO-214AA, SMB	Active	—

Engineering Selection Recommendations

Primary Selection Path: Diodes Incorporated Active Equivalents

For direct replacement with minimal design impact, select from the active Diodes Incorporated product line: B340A-13-F, B340AE-13, B340AQ-13-F, or B340AX-13. These parts are from the same manufacturer as the obsolete B340A-13-F-81 and maintain identical electrical specifications. B340A-13-F and B340AQ-13-F offer the closest match to the original part's reverse leakage specification (500 µA @ 40 V). Selection between these parts depends on packaging format requirements: Cut Tape & Digi-Reel® for B340A-13-F, or Tape & Reel for B340AQ-13-F.

Secondary Selection Path: Cross-Manufacturer Equivalents

When Diodes Incorporated parts are unavailable or supply constraints exist, cross-manufacturer alternatives provide full electrical compatibility. SK34AHE3-LTP (Micro Commercial Co), CDBA340-G (Comchip Technology), SX34-AU_R1_000A1 (Panjit International Inc.), and SX34_R1_00001 (Panjit International Inc.) all meet the core electrical and mechanical requirements. These parts are active products with established supply chains. Reverse leakage current values range from 100 µA to 500 µA @ 40 V, all within acceptable operating margins for Schottky rectifier applications.

Compliance Considerations

All substitute parts listed are ROHS3 Compliant and carry Moisture Sensitivity Level 1 (Unlimited), matching the original part's compliance profile. Parts B340AQ-13-F, SK34AHE3-LTP, and SX34-AU_R1_000A1 carry AEC-Q101 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Package Variant Consideration

SK34AE3/TR13 (Microsemi Corporation) operates at an identical electrical specification but uses the SMB package (DO-214AA) instead of SMA (DO-214AC). This part is suitable only when PCB layout permits the larger SMB footprint and mechanical constraints do not restrict package size. Operating temperature range for this part is -55°C to 125°C, which is 25°C lower than the SMA variants at the upper limit.

Frequently Asked Questions (FAQ)

Q: Can B340A-13-F be used as a direct replacement for B340A-13-F-81?

A: Yes. B340A-13-F is a parametric equivalent with identical voltage (40 V), current (3 A), and forward voltage (500 mV @ 3 A) specifications. The primary difference is product status: B340A-13-F is active while B340A-13-F-81 is obsolete. Both use the same DO-214AC SMA package. The difference in packaging format (Cut Tape & Digi-Reel® vs. the original's unspecified format) does not affect electrical performance.

Q: What is the difference between B340AE-13 and B340AQ-13-F?

A: Both are Diodes Incorporated active products in the SMA package with identical voltage, current, and forward voltage ratings. B340AE-13 has lower reverse leakage current (200 µA @ 40 V) and lower capacitance (140 pF @ 4 V, 1 MHz) compared to B340AQ-13-F (500 µA @ 40 V, 200 pF @ 4 V, 1 MHz). B340AQ-13-F includes specified reverse recovery time (14 ns) and AEC-Q101 automotive qualification. Selection depends on application requirements for leakage current and capacitance characteristics.

Q: Are cross-manufacturer parts such as SK34AHE3-LTP and CDBA340-G fully compatible?

A: Yes. These parts meet all primary electrical specifications: 40 V reverse voltage, 3 A average rectified current, 500 mV forward voltage @ 3 A, and fast recovery speed. All use the DO-214AC SMA package and operate across the -55°C to 150°C temperature range. Reverse leakage current values vary (SK34AHE3-LTP: 100 µA, CDBA340-G: 500 µA), but all values are within acceptable operating margins for Schottky rectifier applications. Cross-manufacturer substitution does not require design changes.

Q: Why does SK34AE3/TR13 have a different package?

A: SK34AE3/TR13 uses the SMB package (DO-214AA) instead of SMA (DO-214AC). Both are surface mount packages with identical electrical specifications, but SMB is physically larger. This part is suitable only when PCB layout and mechanical constraints permit the larger footprint. The operating temperature range is also reduced to -55°C to 125°C (versus -55°C to 150°C for SMA variants).

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification (B340AQ-13-F, SK34AHE3-LTP, SX34-AU_R1_000A1) have undergone additional reliability testing and are approved for automotive applications. This qualification is optional for non-automotive applications but provides assurance of enhanced quality and reliability.

Q: Can I use parts with different reverse leakage current values interchangeably?

A: Yes. The reverse leakage current values provided (100 µA to 500 µA @ 40 V) represent normal variation within Schottky diode manufacturing and are all acceptable for standard rectifier applications. Selection of a part with lower reverse leakage (such as SK34AHE3-LTP at 100 µA) may provide marginal benefits in low-power or high-temperature applications, but all listed parts are functionally interchangeable for the specified electrical envelope.

Q: What is the significance of Moisture Sensitivity Level 1?

A: Moisture Sensitivity Level 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. These parts do not require special moisture-controlled storage or handling procedures and can be stored and handled under standard industrial conditions. All substitute parts listed carry MSL 1, matching the original part's handling requirements.

Q: Which substitute part offers the best availability?

A: SX34_R1_00001 (Panjit International Inc.) shows the highest inventory level at 20,100 pieces. B340A-13-F (Diodes Incorporated) offers 335,400 pieces. Both parts are in active production with established supply chains. For applications requiring immediate availability, either part provides reliable sourcing options.

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