B340B-13 Schottky Diode 40V 3A SMB Equivalent & Substitute Parts

Part Overview

The B340B-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40V reverse voltage and 3A average rectified current in a Surface Mount SMB (DO-214AA) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. The device operates across a junction temperature range of -55°C to 150°C and exhibits fast recovery characteristics suitable for high-frequency rectification applications.

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
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Capacitance @ Vr, F	200	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the B340B-13 is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40V
Current - Average Rectified (Io): 3A minimum
Package / Case: DO-214AA, SMB (Surface Mount)
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Within ±100 mV of 500 mV @ 3A
Current - Reverse Leakage @ Vr: Up to 500 µA @ 40V
Capacitance @ Vr, F: Variation acceptable when not specified
Operating Temperature - Junction: Minimum -55°C, maximum 150°C

Parts are grouped into three categories:

Direct Manufacturer Equivalents – Identical electrical specifications and package, differing only in product status or packaging format
Parametric Equivalents – Identical electrical specifications with automotive qualification
Functional Substitutes – Meet or exceed all critical electrical parameters within the same package family

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Product Status	RoHS Status
B340B-13	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AA, SMB	Discontinued	Non-compliant
B340B-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AA, SMB	Active	ROHS3 Compliant
B340BQ-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AA, SMB	Active	ROHS3 Compliant
CMSH3-40M TR13 PBFREE	Central Semiconductor Corp	40	3	550 @ 3A	500 @ 40V	DO-214AA, SMB	Active	ROHS3 Compliant
B340LB-E3/52T	Vishay General Semiconductor	40	3	450 @ 3A	400 @ 40V	DO-214AA, SMB	Active	ROHS3 Compliant
B340LB-E3/5BT	Vishay General Semiconductor	40	3	450 @ 3A	400 @ 40V	DO-214AA, SMB	Active	ROHS3 Compliant
CDBB340-G	Comchip Technology	40	3	500 @ 3A	500 @ 40V	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant
SK34B-TP	Micro Commercial Co	40	3	500 @ 3A	500 @ 40V	DO-214AA, SMB	Obsolete	ROHS3 Compliant
SK44BL-TP	Micro Commercial Co	40	4	450 @ 4A	500 @ 40V	DO-214AA, SMB	Active	ROHS3 Compliant
STPS140U	STMicroelectronics	40	1	550 @ 1A	12 @ 40V	DO-214AA, SMB	Active	ROHS3 Compliant
BAT165E6327HTSA1	Infineon Technologies	40	0.75	740 @ 0.75A	50 @ 40V	SC-76, SOD-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 – Direct Replacement (Recommended for New Designs):

B340B-13-F and B340BQ-13-F are the primary recommended substitutes. Both are manufactured by Diodes Incorporated with identical electrical specifications to the original B340B-13. These parts are in active production status with ROHS3 compliance and AEC-Q101 automotive qualification. B340B-13-F is available in Cut Tape and Digi-Reel packaging with 95,300 units in stock. B340BQ-13-F is available in the same packaging format with 35,300 units in stock. Both maintain the -55°C to 150°C operating temperature range and are direct functional replacements.

Tier 2 – Parametric Equivalents (Alternative Sources):

B340LB-E3/52T and B340LB-E3/5BT from Vishay General Semiconductor meet all critical electrical parameters with improved forward voltage characteristics (450 mV @ 3A versus 500 mV @ 3A) and lower reverse leakage (400 µA @ 40V versus 500 µA @ 40V). Both are ROHS3 compliant and in active production. B340LB-E3/52T is available in Cut Tape format with 15,691 units in stock. B340LB-E3/5BT is available in Tape & Reel format with 3,859 units in stock. These parts are suitable for applications where improved thermal performance is beneficial.

Tier 3 – Functional Substitutes (Current-Rated Alternatives):

SK44BL-TP from Micro Commercial Co is rated for 4A average rectified current at 40V reverse voltage, exceeding the 3A requirement of the original part. This part is in active production status with ROHS3 compliance and is suitable for applications requiring higher current capacity within the same package footprint. Operating temperature range is -55°C to 150°C.

Not Recommended for New Designs:

CDBB340-G (Comchip Technology) is marked "Not For New Designs" and should not be selected for new applications. SK34B-TP (Micro Commercial Co) is obsolete and should not be used for new designs. STPS140U (STMicroelectronics) is rated for only 1A average rectified current, below the 3A requirement, and is suitable only for lower-current applications. BAT165E6327HTSA1 (Infineon Technologies) is rated for 750mA and uses a different package (SC-76, SOD-323), making it unsuitable as a direct replacement.

Frequently Asked Questions (FAQ)

Q: Can B340B-13-F be used as a direct replacement for B340B-13?

A: Yes. B340B-13-F is manufactured by Diodes Incorporated with identical electrical specifications: 40V reverse voltage, 3A average rectified current, 500 mV forward voltage at 3A, and the same DO-214AA SMB package. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant). B340B-13-F is the recommended direct replacement.

Q: What is the difference between B340B-13-F and B340BQ-13-F?

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications and packaging. The primary difference is the internal device designation (B340B versus B340BQ). Both are ROHS3 compliant, AEC-Q101 qualified, and in active production. Selection between these parts depends on availability and packaging format preference.

Q: Can B340LB-E3/52T replace B340B-13 in all applications?

A: B340LB-E3/52T meets all critical electrical parameters and is a functional equivalent. The forward voltage is lower (450 mV @ 3A versus 500 mV @ 3A), which reduces power dissipation and improves thermal performance. Reverse leakage is also lower (400 µA @ 40V versus 500 µA @ 40V). These characteristics make it suitable for most applications; however, circuit designs with tight forward voltage specifications should be verified.

Q: Why is STPS140U listed if it cannot replace B340B-13?

A: STPS140U is included for reference purposes as it appears in the original substitute list provided. However, STPS140U is rated for only 1A average rectified current, which is below the 3A requirement of B340B-13. This part is not suitable as a replacement for the original part and should be used only in applications requiring 1A or lower current capacity.

Q: What is the significance of the packaging format (Cut Tape vs. Tape & Reel)?

A: Packaging format affects handling, storage, and automated assembly processes. Cut Tape (CT) & Digi-Reel format is suitable for both manual and automated pick-and-place equipment. Tape & Reel (TR) format is optimized for high-volume automated assembly. Electrical performance is identical between packaging formats; selection depends on production volume and assembly equipment capabilities.

Q: Can SK44BL-TP be used in place of B340B-13?

A: SK44BL-TP is rated for 4A average rectified current at 40V, which exceeds the 3A requirement of B340B-13. The forward voltage is lower (450 mV @ 4A versus 500 mV @ 3A). This part is in active production with ROHS3 compliance and the same DO-214AA SMB package. It is suitable as a replacement when higher current capacity is acceptable or beneficial to the application.

Q: What does RoHS compliance mean for part selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. The original B340B-13 is RoHS non-compliant. All recommended substitutes (B340B-13-F, B340BQ-13-F, B340LB-E3/52T, B340LB-E3/5BT, SK44BL-TP) are ROHS3 compliant, making them suitable for applications with RoHS requirements.

Q: What is AEC-Q101 qualification?

A: AEC-Q101 is an automotive qualification standard for discrete semiconductors. B340B-13-F and B340BQ-13-F carry this qualification, indicating they meet automotive industry reliability and performance standards. This qualification is relevant for automotive and high-reliability applications.

Q: Are there any temperature range differences between substitutes?

A: Most substitutes maintain the -55°C to 150°C operating temperature range of the original B340B-13. CDBB340-G has a maximum junction temperature of 125°C (versus 150°C), and SK34B-TP has a maximum of 125°C. STPS140U specifies only a maximum of 150°C without a minimum. For applications requiring the full -55°C to 150°C range, verify the specific part's temperature specification.

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