B340LA-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B340LA-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 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and repair applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with acceptable parameter variations within the application's tolerance envelope.

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
Capacitance @ Vr, F	180	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
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 B340LA-13 is determined by the following critical parameters:

Mandatory Matching Parameters:

Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Surface Mount
Package / Case: DO-214AC (SMA) or compatible surface mount package

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Up to 550 mV @ 3 A
Current - Reverse Leakage @ Vr: Up to 500 µA @ 40 V
Capacitance @ Vr, F: 12 pF to 350 pF range
Operating Temperature - Junction: Minimum -50°C to maximum 150°C
RoHS Status: RoHS3 Compliant preferred for new designs

Substitute parts are grouped into three categories: parametric equivalents (identical specifications), direct functional substitutes (same voltage and current ratings with minor parameter variations), and alternative package options (same electrical performance in different surface mount packages).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [mV]	Ir @ 40V [µA]	Package	Product Status	RoHS Status
B340LA-13	Diodes Incorporated	40	3	450	2000	DO-214AC, SMA	Discontinued	Non-compliant
B340LA-13-F	Diodes Incorporated	40	3	450	2000	DO-214AC, SMA	Active	ROHS3 Compliant
CDBA340-HF	Comchip Technology	40	3	500	500	DO-214AC, SMA	Active	ROHS3 Compliant
CDBA340L-G	Comchip Technology	40	3	400	1500	DO-214AC, SMA	Active	ROHS3 Compliant
CDBA340-G	Comchip Technology	40	3	500	500	DO-214AC, SMA	Active	ROHS3 Compliant
MBRA340T3G	onsemi	40	3	450	300	DO-214AC, SMA	Active	ROHS3 Compliant
RB050L-40TE25	Rohm Semiconductor	40	3	550	1000	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
RB050L-40DDTE25	Rohm Semiconductor	40	3	550	1000	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
PMEG4030EP,115	Nexperia USA Inc.	40	3	490	200	SOD-128	Active	ROHS3 Compliant
B350A-M3/61T	Vishay General Semiconductor	50	3	720	200	DO-214AC, SMA	Active	ROHS3 Compliant
BAT165E6327HTSA1	Infineon Technologies	40	0.75	740	50	SC-76, SOD-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent (Recommended for Direct Replacement):

B340LA-13-F is the primary equivalent part. Manufactured by Diodes Incorporated, this part maintains identical electrical specifications to the B340LA-13 while offering Active product status and ROHS3 compliance. The packaging format (Cut Tape and Digi-Reel) provides supply chain flexibility. This part is suitable for direct substitution in all applications where the original B340LA-13 was specified.

Secondary Equivalents (Same Electrical Performance, Different Manufacturers):

CDBA340-HF (Comchip Technology), CDBA340L-G (Comchip Technology), and MBRA340T3G (onsemi) provide equivalent 40 V, 3 A Schottky rectifier performance in the same DO-214AC SMA package. All three maintain Active product status and ROHS3 compliance. CDBA340L-G offers the lowest forward voltage (400 mV @ 3 A) among this group. MBRA340T3G provides forward voltage matching the original specification (450 mV @ 3 A).

Alternative Package Options (Same Electrical Performance, Different Package):

PMEG4030EP,115 (Nexperia USA Inc.) provides equivalent 40 V, 3 A performance in a SOD-128 package. This part is suitable for applications where SOD-128 footprint compatibility exists. Forward voltage (490 mV @ 3 A) remains within acceptable tolerance.

Higher Voltage Alternative (Uprated Specification):

B350A-M3/61T (Vishay General Semiconductor) provides 50 V reverse voltage rating with 3 A current capacity. This part is suitable for applications requiring higher voltage margin. Forward voltage is elevated (720 mV @ 3 A) and must be evaluated for circuit impact.

Lower Current Alternative (Downrated Specification):

BAT165E6327HTSA1 (Infineon Technologies) provides 40 V reverse voltage with 750 mA current capacity in a SOD-323 package. This part is suitable only for applications with current requirements not exceeding 750 mA and where SOD-323 footprint compatibility exists.

Obsolescence Status Consideration:

RB050L-40TE25 and RB050L-40DDTE25 (Rohm Semiconductor) are marked "Not For New Designs" and should be avoided for new product development. These parts remain available for legacy system support only.

Frequently Asked Questions (FAQ)

Q: Can B340LA-13-F be used as a direct replacement for B340LA-13?

A: Yes. B340LA-13-F is a parametric equivalent manufactured by the same supplier (Diodes Incorporated) with identical electrical specifications. The primary difference is product status (Active vs. Discontinued) and RoHS compliance (ROHS3 vs. non-compliant). B340LA-13-F is the recommended replacement.

Q: What is the difference between CDBA340-HF and CDBA340L-G?

A: Both are 40 V, 3 A Schottky diodes in DO-214AC SMA packages from Comchip Technology. CDBA340L-G has lower forward voltage (400 mV @ 3 A vs. 500 mV @ 3 A) and lower reverse leakage current (1.5 mA vs. 500 µA @ 40 V). Selection depends on circuit requirements for forward voltage drop and leakage current performance.

Q: Can PMEG4030EP,115 replace B340LA-13 in existing PCB designs?

A: No. PMEG4030EP,115 uses a SOD-128 package while B340LA-13 uses DO-214AC SMA. PCB footprint redesign is required. Electrical performance is equivalent (40 V, 3 A, Schottky), but physical package incompatibility prevents direct board-level substitution.

Q: Is B350A-M3/61T suitable for B340LA-13 applications?

A: B350A-M3/61T provides higher voltage rating (50 V vs. 40 V) and identical current capacity (3 A). It is suitable for applications where higher voltage margin is beneficial. However, forward voltage is significantly higher (720 mV @ 3 A vs. 450 mV @ 3 A), which may impact circuit performance and power dissipation. Circuit analysis is required before substitution.

Q: Why is BAT165E6327HTSA1 listed as a substitute if it has lower current rating?

A: BAT165E6327HTSA1 is included for applications where current requirements do not exceed 750 mA. It provides 40 V reverse voltage in a smaller SOD-323 package, suitable for space-constrained designs with lower current demands. It is not suitable for applications requiring the full 3 A capacity of B340LA-13.

Q: Should RB050L-40TE25 be used for new designs?

A: No. RB050L-40TE25 is marked "Not For New Designs" by the manufacturer (Rohm Semiconductor). This part should be used only for legacy system maintenance and repair. New product development should select from parts with Active product status.

Q: What is the significance of RoHS compliance in substitute selection?

A: RoHS3 compliance is required for products sold in markets with RoHS regulations. B340LA-13 is RoHS non-compliant. All recommended substitutes (B340LA-13-F, CDBA340-HF, CDBA340L-G, MBRA340T3G, PMEG4030EP,115, B350A-M3/61T) are ROHS3 compliant, ensuring regulatory compliance for new production.

Q: Are all substitute parts available in the same packaging format (Cut Tape, Digi-Reel, Tape & Reel)?

A: No. Packaging formats vary by manufacturer and part number. B340LA-13-F is available in Cut Tape and Digi-Reel. CDBA340-HF, CDBA340L-G, and CDBA340-G are available in Tape & Reel. MBRA340T3G and RB050L-40TE25 are available in Cut Tape and Digi-Reel. Verify packaging availability with your supplier for production requirements.

Q: What parameters must remain constant for a part to be considered a true equivalent?

A: True equivalents must maintain identical voltage rating (40 V), current rating (3 A), technology (Schottky), and package type (DO-214AC SMA). Forward voltage, reverse leakage current, and capacitance may vary within acceptable engineering tolerances. B340LA-13-F meets all these criteria and is the true equivalent.

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