B340A-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B340A-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 3 A average rectified current in a surface mount SMA (DO-214AC) package. This part is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and repair applications. The device is qualified to AEC-Q101 automotive standards and operates across a junction temperature range of -55°C to 150°C.

Substitute parts are required due to the discontinued status of the original B340A-13. Equivalent alternatives maintain identical or superior electrical characteristics while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV @ A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Capacitance @ Vr, F	200	pF @ 4V, 1MHz
Technology	Schottky	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the B340A-13:

Parametric Equivalents maintain all critical electrical specifications: 40 V reverse voltage rating, 3 A average rectified current, 500 mV forward voltage drop at 3 A, fast recovery speed characteristics, and identical SMA package form factor. These parts are direct functional replacements with no circuit redesign required.

Manufacturer Recommended Alternatives satisfy the primary electrical requirements (40 V, 3 A, fast recovery Schottky technology) but may differ in secondary parameters such as forward voltage, reverse leakage current, capacitance, package variant, or operating temperature range. These parts require design review to confirm compatibility with specific application constraints.

Critical Selection Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 3 A minimum
Technology: Schottky
Package: DO-214AC (SMA) or compatible surface mount package
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Ir @ Vr [µA @ V]	C @ Vr [pF @ V, MHz]	Package	Product Status	RoHS Status
B340A-13	Diodes Incorporated	40	3	500 @ 3	500 @ 40	200 @ 4, 1	DO-214AC, SMA	Discontinued	RoHS non-compliant
B340A-13-F	Diodes Incorporated	40	3	500 @ 3	500 @ 40	200 @ 4, 1	DO-214AC, SMA	Active	ROHS3 Compliant
B340AE-13	Diodes Incorporated	40	3	500 @ 3	200 @ 40	140 @ 4, 1	DO-214AC, SMA	Active	ROHS3 Compliant
B340AQ-13-F	Diodes Incorporated	40	3	500 @ 3	500 @ 40	200 @ 4, 1	DO-214AC, SMA	Active	ROHS3 Compliant
CMSH3-40MA TR13 PBFREE	Central Semiconductor Corp	40	3	500 @ 3	500 @ 40	280 @ 4, 1	DO-214AC, SMA	Active	ROHS3 Compliant
B350A-M3/61T	Vishay General Semiconductor - Diodes Division	50	3	720 @ 3	200 @ 50	145 @ 4, 1	DO-214AC, SMA	Active	ROHS3 Compliant
BAT165E6327HTSA1	Infineon Technologies	40	0.75	740 @ 0.75	50 @ 40	12 @ 10, 1	SC-76, SOD-323	Active	ROHS3 Compliant
CDBA340-HF	Comchip Technology	40	3	500 @ 3	500 @ 40	250 @ 4, 1	DO-214AC, SMA	Active	ROHS3 Compliant
CDBA340L-G	Comchip Technology	40	3	400 @ 3	1500 @ 40	—	DO-214AC, SMA	Active	ROHS3 Compliant
MBRA340T3G	onsemi	40	3	450 @ 3	300 @ 40	—	DO-214AC, SMA	Active	ROHS3 Compliant
PMEG4030ER,115	Nexperia USA Inc.	40	3	540 @ 3	100 @ 40	250 @ 1, 1	SOD-123W	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalents (Preferred):

B340A-13-F, B340AE-13, and B340AQ-13-F are manufactured by Diodes Incorporated and maintain identical or superior electrical specifications to the original B340A-13. All three parts are active products with ROHS3 compliance. B340A-13-F and B340AQ-13-F preserve the exact forward voltage and reverse leakage characteristics of the original part. B340AE-13 exhibits lower reverse leakage current (200 µA vs. 500 µA) and reduced capacitance (140 pF vs. 200 pF), which may improve performance in high-frequency switching applications. These parts require no circuit modification.

Tier 2 - Equivalent Electrical Performance, Alternative Manufacturers:

CMSH3-40MA TR13 PBFREE (Central Semiconductor Corp), CDBA340-HF (Comchip Technology), and MBRA340T3G (onsemi) provide 40 V, 3 A Schottky rectification in SMA packages with active product status and ROHS3 compliance. CDBA340-HF matches the original forward voltage specification exactly. MBRA340T3G offers reduced forward voltage (450 mV vs. 500 mV), which decreases power dissipation. CMSH3-40MA exhibits slightly elevated capacitance (280 pF vs. 200 pF). All three are suitable for direct substitution in standard rectification circuits.

Tier 3 - Conditional Substitutes:

CDBA340L-G (Comchip Technology) provides superior forward voltage performance (400 mV vs. 500 mV) but exhibits elevated reverse leakage current (1.5 mA vs. 500 µA) and a reduced maximum junction temperature (125°C vs. 150°C). This part is suitable only for applications where lower forward voltage is prioritized and reverse leakage current elevation is acceptable.

B350A-M3/61T (Vishay) offers higher voltage rating (50 V vs. 40 V) and lower reverse leakage (200 µA vs. 500 µA) but exhibits significantly higher forward voltage (720 mV vs. 500 mV), resulting in increased power dissipation. This part is suitable for applications requiring higher voltage margin with acceptance of increased thermal load.

Tier 4 - Limited Compatibility:

BAT165E6327HTSA1 (Infineon Technologies) is a 40 V, 750 mA Schottky diode in SOD-323 package. The reduced current rating (750 mA vs. 3 A) and different package form factor (SOD-323 vs. SMA) restrict this part to applications with lower current requirements and compatible PCB layouts. This part is not recommended as a direct replacement for 3 A applications.

PMEG4030ER,115 (Nexperia USA Inc.) is a 40 V, 3 A Schottky diode in SOD-123W package. While electrical specifications are compatible, the different package form factor (SOD-123W vs. SMA) requires PCB layout modification. This part is suitable only when package footprint change is acceptable.

All recommended substitutes maintain AEC-Q101 automotive qualification or equivalent reliability standards and ROHS3 compliance, ensuring regulatory and quality requirements are met.

Frequently Asked Questions (FAQ)

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

A: Yes. B340A-13-F is a parametric equivalent manufactured by Diodes Incorporated with identical electrical specifications: 40 V reverse voltage, 3 A average rectified current, 500 mV forward voltage at 3 A, and SMA package form factor. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modification is required.

Q: What is the difference between B340AE-13 and B340A-13?

A: B340AE-13 maintains the same voltage and current ratings as B340A-13 but exhibits lower reverse leakage current (200 µA vs. 500 µA) and reduced capacitance (140 pF vs. 200 pF). These improvements reduce power dissipation and improve high-frequency switching performance. Both parts use identical SMA packages and are suitable for direct substitution.

Q: Why does B350A-M3/61T have higher forward voltage than B340A-13?

A: B350A-M3/61T is rated for 50 V reverse voltage compared to 40 V for B340A-13. Higher voltage-rated Schottky diodes typically exhibit higher forward voltage drops due to semiconductor material and junction design differences. The 720 mV forward voltage at 3 A results in approximately 2.16 W power dissipation compared to 1.5 W for B340A-13 at identical current.

Q: Can PMEG4030ER,115 replace B340A-13 in existing PCB designs?

A: PMEG4030ER,115 provides equivalent electrical performance (40 V, 3 A, fast recovery Schottky) but uses SOD-123W package instead of SMA. Direct PCB substitution is not possible without layout modification. The SOD-123W package has different lead spacing and footprint dimensions. This part is suitable only when PCB redesign is acceptable.

Q: Is BAT165E6327HTSA1 suitable for 3 A applications?

A: No. BAT165E6327HTSA1 is rated for 750 mA average rectified current, which is 25% of the 3 A requirement for B340A-13. Operating this part at 3 A exceeds its current rating and will cause excessive heating and potential device failure. This part is suitable only for applications requiring 750 mA or less.

Q: What is the significance of ROHS3 compliance for substitute parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original B340A-13 is RoHS non-compliant. All recommended substitute parts are ROHS3 compliant, ensuring compatibility with modern manufacturing standards and regulatory requirements for new production.

Q: Do all substitute parts maintain AEC-Q101 automotive qualification?

A: B340A-13-F and B340AQ-13-F explicitly maintain AEC-Q101 automotive qualification. Other substitute parts (CMSH3-40MA, CDBA340-HF, CDBA340L-G, MBRA340T3G, PMEG4030ER,115, B350A-M3/61T, BAT165E6327HTSA1) are manufactured by established semiconductor suppliers with automotive-grade quality standards but do not explicitly list AEC-Q101 certification in the provided specifications. For automotive applications requiring explicit AEC-Q101 qualification, B340A-13-F or B340AQ-13-F are recommended.

Q: What is the operating temperature range difference between B340A-13 and CDBA340L-G?

A: B340A-13 operates from -55°C to 150°C junction temperature. CDBA340L-G has a maximum junction temperature of 125°C, representing a 25°C reduction in upper operating limit. This restriction may impact applications requiring operation at elevated ambient temperatures or high-current conditions where junction temperature approaches maximum ratings.

Q: How does reverse leakage current affect circuit performance?

A: Reverse leakage current represents unwanted current flow when the diode is reverse-biased. Higher reverse leakage increases power dissipation and may affect precision analog circuits. B340AE-13 (200 µA) and MBRA340T3G (300 µA) exhibit lower reverse leakage than B340A-13 (500 µA), improving efficiency. CDBA340L-G (1.5 mA) exhibits significantly higher reverse leakage, which may be problematic in sensitive applications.

Q: Can CMSH3-40MA TR13 PBFREE be used in high-frequency switching applications?

A: Yes. CMSH3-40MA TR13 PBFREE maintains fast recovery characteristics (≤ 500ns, > 200mA) identical to B340A-13. The slightly elevated capacitance (280 pF vs. 200 pF) may marginally increase switching losses at very high frequencies (above 1 MHz), but this difference is typically negligible in standard power supply and rectification applications.

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