B340LB-13 Equivalent & Substitute Parts

Part Overview

The B340LB-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 SMB (DO-214AA) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the application.

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	450 mV @ 3 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	2	mA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the B340LB-13 is determined by the following critical parameters:

Electrical Specifications:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 3 A minimum
Technology: Schottky diode
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Specifications:

Mounting Type: Surface Mount
Package / Case: DO-214AA (SMB) or equivalent surface mount package
Operating Temperature Range: Minimum -55°C to 125°C junction temperature

Compliance & Status:

RoHS Status: ROHS3 Compliant preferred for new designs
Moisture Sensitivity Level: MSL 1 (Unlimited)
Product Status: Active or Not For New Designs acceptable; Obsolete parts listed for reference only

Substitute parts are grouped into two categories:

Category 1 - Direct Parametric Equivalents (Same Package, Same Current Rating): Parts maintaining 40 V, 3 A specifications in DO-214AA (SMB) package with identical or superior electrical characteristics.

Category 2 - Functional Alternatives (Different Package or Current Rating): Parts with 40 V rating but alternative current ratings or package types, suitable for applications where package footprint or current headroom differs from original design.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package / Case	Product Status	RoHS Status
B340LB-13	Diodes Incorporated	40	3	450 @ 3A	DO-214AA, SMB	Discontinued at DiGi Electronics	RoHS non-compliant
B340LB-13-F	Diodes Incorporated	40	3	450 @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant
SK34B-LTP	Micro Commercial Co	40	3	500 @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant
SK34B-TP	Micro Commercial Co	40	3	500 @ 3A	DO-214AA, SMB	Obsolete	ROHS3 Compliant
CDBB340-G	Comchip Technology	40	3	500 @ 3A	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant
SL34B	SMC Diode Solutions	40	3	500 @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant
PMEG4030EP,115	Nexperia USA Inc.	40	3	490 @ 3A	SOD-128	Active	ROHS3 Compliant
SK44BL-TP	Micro Commercial Co	40	4	450 @ 4A	DO-214AA, SMB	Active	ROHS3 Compliant
BAT165E6327HTSA1	Infineon Technologies	40	0.75	740 @ 0.75A	SC-76, SOD-323	Active	ROHS3 Compliant
SS24HE3_A/I	Vishay General Semiconductor - Diodes Division	40	2	500 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant
STPS140U	STMicroelectronics	40	1	550 @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

B340LB-13-F (Diodes Incorporated) is the direct parametric equivalent to the B340LB-13. This part maintains identical electrical specifications (40 V, 3 A, 450 mV forward voltage at 3 A) and package configuration (DO-214AA, SMB). The B340LB-13-F is Active in product status and ROHS3 Compliant, addressing the RoHS non-compliance limitation of the original B340LB-13. This part is the preferred replacement for direct substitution in existing designs.

Secondary Recommendations - Same Package, Same Current Rating:

SK34B-LTP (Micro Commercial Co) provides a 40 V, 3 A Schottky diode in DO-214AA (SMB) package with Active product status and ROHS3 compliance. Forward voltage is specified at 500 mV @ 3 A, representing a 50 mV increase over the B340LB-13. This part is suitable for applications where the slightly higher forward voltage is acceptable within thermal and efficiency budgets.

SL34B (SMC Diode Solutions) offers equivalent 40 V, 3 A specifications in SMB package with Active status and ROHS3 compliance. Forward voltage specification is 500 mV @ 3 A. This part provides an alternative source for the same electrical and mechanical specifications.

CDBB340-G (Comchip Technology) maintains 40 V, 3 A ratings in DO-214AA (SMB) package with ROHS3 compliance. Product status is listed as Not For New Designs; this part is suitable for legacy system maintenance only.

Alternative for Higher Current Capability:

SK44BL-TP (Micro Commercial Co) provides 40 V, 4 A capability in DO-214AA (SMB) package with Active status and ROHS3 compliance. Forward voltage is 450 mV @ 4 A, matching the original B340LB-13 forward voltage specification. This part is suitable for applications requiring additional current margin or where 4 A rating is required.

Alternative for Lower Current Applications:

SS24HE3_A/I (Vishay General Semiconductor - Diodes Division) is rated for 40 V, 2 A in DO-214AA (SMB) package. This part includes AEC-Q101 automotive qualification and extended operating temperature range (-65°C to 150°C). Selection is appropriate for applications with 2 A maximum current requirements and automotive-grade reliability requirements.

STPS140U (STMicroelectronics) provides 40 V, 1 A capability in SMB package. This part is suitable only for applications with 1 A or lower current requirements.

Alternative Package Option:

PMEG4030EP,115 (Nexperia USA Inc.) maintains 40 V, 3 A specifications with forward voltage of 490 mV @ 3 A in SOD-128 package. This part is suitable for applications where SOD-128 package footprint is acceptable or preferred over SMB. Active status and ROHS3 compliance are confirmed.

Not Recommended:

BAT165E6327HTSA1 (Infineon Technologies) is rated for only 750 mA and is not suitable for 3 A applications. This part is listed for reference only and does not meet the current requirement of the B340LB-13.

Frequently Asked Questions (FAQ)

Q: Can B340LB-13-F be used as a direct replacement for B340LB-13?

A: Yes. B340LB-13-F is the direct parametric equivalent, maintaining identical electrical specifications (40 V, 3 A, 450 mV @ 3 A) and package configuration (DO-214AA, SMB). The primary difference is product status (Active vs. Discontinued) and RoHS compliance (ROHS3 vs. non-compliant). B340LB-13-F is the recommended replacement.

Q: What is the difference between SK34B-LTP and SK34B-TP?

A: Both parts are manufactured by Micro Commercial Co with identical electrical specifications (40 V, 3 A, 500 mV @ 3 A) and DO-214AA (SMB) package. SK34B-LTP has Active product status, while SK34B-TP is listed as Obsolete. SK34B-LTP is preferred for new designs and ongoing production. Operating temperature ranges differ slightly: SK34B-LTP extends to 150°C maximum junction temperature versus 125°C for SK34B-TP.

Q: Can I use SK44BL-TP (4 A) instead of B340LB-13 (3 A)?

A: Yes, SK44BL-TP is suitable for applications originally designed for B340LB-13. The 4 A rating provides additional current margin. Both parts share the same 40 V voltage rating, DO-214AA (SMB) package, and forward voltage specification (450 mV @ rated current). SK44BL-TP is Active and ROHS3 Compliant.

Q: Why is PMEG4030EP,115 listed as an alternative if it uses a different package?

A: PMEG4030EP,115 maintains identical electrical specifications (40 V, 3 A) with superior forward voltage (490 mV @ 3 A) and is Active with ROHS3 compliance. The SOD-128 package is smaller than SMB, making it suitable for space-constrained applications. Package selection depends on PCB layout requirements and design constraints.

Q: Is SS24HE3_A/I suitable for B340LB-13 replacement?

A: SS24HE3_A/I is suitable only for applications where maximum current requirement is 2 A or lower. This part is rated for 40 V, 2 A and includes AEC-Q101 automotive qualification with extended temperature range (-65°C to 150°C). It is not suitable for applications requiring the full 3 A capability of B340LB-13.

Q: What does RoHS compliance mean for this part selection?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the part does not contain restricted materials such as lead, cadmium, or mercury. B340LB-13 is RoHS non-compliant, while all recommended substitutes are ROHS3 Compliant. For new designs and applications subject to RoHS regulations, ROHS3 Compliant parts are required.

Q: Can I use STPS140U as a substitute?

A: STPS140U is not suitable for B340LB-13 replacement. STPS140U is rated for only 1 A average rectified current, while B340LB-13 is rated for 3 A. Using an undersized component will result in thermal stress and potential failure. STPS140U is listed for reference only.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: All listed parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These parts do not require special moisture-controlled storage or handling procedures and can be stored and handled under standard conditions.

Q: Are there any temperature range differences between substitute parts?

A: Yes. B340LB-13 specifies -55°C to 125°C junction temperature. SK34B-LTP and SK44BL-TP extend to 150°C maximum. PMEG4030EP,115 and SS24HE3_A/I also specify 150°C maximum. These extended ranges provide additional thermal margin in high-temperature applications. Selection depends on application temperature requirements.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging?

A: Both are surface mount tape and reel formats suitable for automated assembly. Cut Tape (CT) & Digi-Reel® indicates the supplier offers both cut tape and reel options. Tape & Reel (TR) indicates reel format only. Selection depends on production volume and assembly equipment compatibility. Electrical specifications are identical regardless of packaging format.

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