B0540W-7 Schottky Diode 40V 500mA SOD-123 Equivalent & Substitute Parts

Part Overview

The B0540W-7 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40V reverse voltage and 500mA average rectified current in a surface mount SOD-123 package. This component is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. The part exhibits fast recovery characteristics with reverse leakage current of 20µA at 40V and forward voltage of 510mV at 500mA.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	500	mA
Voltage - Forward (Vf) (Max) @ If	510 mV @ 500 mA	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	20	µA @ 40V
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the B0540W-7 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40V
Current - Average Rectified (Io): 500mA
Technology: Schottky
Package / Case: SOD-123
Mounting Type: Surface Mount
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 20µA @ 40V
Voltage - Forward (Vf) (Max) @ If: 510mV @ 500mA

Grouping Categories:

Group 1: Direct Electrical Equivalents (SOD-123, 40V/500mA, Identical Electrical Characteristics) Parts meeting all primary substitution criteria with identical forward voltage, reverse leakage, and capacitance specifications. These include B0540W-7-F, B0540WQ-7-F, CDBW0540-G, CMHSH5-4 TR PBFREE, MBR0540L-TP, MBR0540T1G, MBR0540T3G, and NRVB0540T1G.

Group 2: Parametric Equivalents with Acceptable Variations Parts meeting core voltage and current ratings with minor deviations in secondary parameters (forward voltage tolerance, reverse leakage, or capacitance) that remain within functional equivalence for most applications. This includes MBR0540-TP with 550mV forward voltage and 200µA reverse leakage.

Group 3: Higher Current Rating Alternatives The BAT165E6327HTSA1 provides 750mA current rating at 40V in a different package (SOD-323), suitable for applications requiring increased current capacity but requiring package redesign.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Reverse Leakage @ Vr	Package	Temp Range	RoHS Status	Product Status
B0540W-7	Diodes Inc	40V	500mA	510mV @ 500mA	20µA @ 40V	SOD-123	-65 to 150°C	Non-compliant	Discontinued
B0540W-7-F	Diodes Inc	40V	500mA	510mV @ 500mA	20µA @ 40V	SOD-123	-65 to 150°C	ROHS3 Compliant	Active
B0540WQ-7-F	Diodes Inc	40V	500mA	510mV @ 500mA	20µA @ 40V	SOD-123	-65 to 150°C	ROHS3 Compliant	Active
BAT165E6327HTSA1	Infineon	40V	750mA	740mV @ 750mA	50µA @ 40V	SOD-323	-40 to 150°C	ROHS3 Compliant	Active
CDBW0540-G	Comchip	40V	500mA	510mV @ 500mA	20µA @ 40V	SOD-123	-40 to 125°C	ROHS3 Compliant	Active
CMHSH5-4 TR PBFREE	Central Semiconductor	40V	500mA	620mV @ 1A	20µA @ 40V	SOD-123	-65 to 125°C	ROHS3 Compliant	Active
MBR0540-TP	Micro Commercial	40V	500mA	550mV @ 500mA	200µA @ 40V	SOD-123	-55 to 150°C	ROHS3 Compliant	Active
MBR0540L-TP	Micro Commercial	40V	500mA	510mV @ 500mA	20µA @ 40V	SOD-123	-65 to 125°C	ROHS3 Compliant	Active
MBR0540T1G	onsemi	40V	500mA	510mV @ 500mA	20µA @ 40V	SOD-123	-55 to 150°C	ROHS3 Compliant	Active
MBR0540T3G	onsemi	40V	500mA	510mV @ 500mA	20µA @ 40V	SOD-123	-55 to 150°C	ROHS3 Compliant	Active
NRVB0540T1G	onsemi	40V	500mA	510mV @ 500mA	20µA @ 40V	SOD-123	-55 to 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Recommendation: B0540W-7-F (Diodes Incorporated)

The B0540W-7-F is the direct successor to the discontinued B0540W-7, manufactured by the same supplier with identical electrical specifications. This part maintains 100% parametric equivalence including 40V reverse voltage, 500mA average rectified current, 510mV forward voltage at 500mA, and 20µA reverse leakage. The B0540W-7-F achieves ROHS3 compliance, addressing regulatory requirements absent in the original part. Operating temperature range extends from -65°C to 150°C. This part is active in production with substantial inventory availability.

Secondary Recommendation: B0540WQ-7-F (Diodes Incorporated, Automotive Grade)

The B0540WQ-7-F provides identical electrical performance to B0540W-7-F with additional automotive qualification (AEC-Q101) and Tape & Reel packaging. This variant is suitable for automotive and high-reliability applications requiring formal qualification documentation. Operating temperature range matches the original part (-65°C to 150°C).

Tertiary Recommendations: onsemi MBR0540T1G, MBR0540T3G, NRVB0540T1G

These onsemi parts deliver complete parametric equivalence with 40V/500mA ratings, 510mV forward voltage, and 20µA reverse leakage. The NRVB0540T1G includes automotive qualification (AEC-Q101). All three parts are ROHS3 compliant and active in production. MBR0540T1G and MBR0540T3G operate from -55°C to 150°C; NRVB0540T1G operates from -55°C to 150°C.

Alternative Equivalent: MBR0540L-TP (Micro Commercial Co)

The MBR0540L-TP maintains full electrical equivalence with 510mV forward voltage and 20µA reverse leakage but operates within -65°C to 125°C temperature range. This part is suitable for applications not requiring the full upper temperature range of the original part.

Acceptable Variation: MBR0540-TP (Micro Commercial Co)

The MBR0540-TP exhibits acceptable parametric variation with 550mV forward voltage (40mV higher than original) and 200µA reverse leakage (10x higher than original). This part remains functionally equivalent for applications with relaxed forward voltage and leakage specifications. Operating temperature range extends to 150°C maximum.

Higher Current Alternative: BAT165E6327HTSA1 (Infineon)

The BAT165E6327HTSA1 provides 750mA current capacity at 40V in SOD-323 package, suitable for applications requiring increased current handling. This part requires package redesign and operates within -40°C to 150°C temperature range. Forward voltage is 740mV at 750mA, and reverse leakage is 50µA at 40V.

Compliance Consideration: CDBW0540-G (Comchip Technology)

The CDBW0540-G delivers parametric equivalence with 510mV forward voltage and 20µA reverse leakage but operates within -40°C to 125°C temperature range. This part is ROHS3 compliant and active in production.

Frequently Asked Questions (FAQ)

Q: Can B0540W-7-F be used as a direct replacement for B0540W-7?

A: Yes. The B0540W-7-F is electrically and mechanically identical to B0540W-7 with matching 40V reverse voltage, 500mA current rating, 510mV forward voltage at 500mA, and 20µA reverse leakage. Both use SOD-123 surface mount packaging. The primary difference is ROHS3 compliance in the B0540W-7-F and active production status versus discontinued status of the original part.

Q: What is the difference between B0540W-7-F and B0540WQ-7-F?

A: Both parts are electrically identical with 40V/500mA ratings and 510mV forward voltage. The B0540WQ-7-F includes automotive qualification (AEC-Q101) and is supplied in Tape & Reel packaging, while B0540W-7-F is supplied in Cut Tape & Digi-Reel packaging. Select B0540WQ-7-F for automotive applications requiring formal qualification documentation.

Q: Are onsemi MBR0540T1G and MBR0540T3G interchangeable?

A: Yes. Both parts are electrically identical with 40V reverse voltage, 500mA current rating, 510mV forward voltage at 500mA, and 20µA reverse leakage. Both operate from -55°C to 150°C and are ROHS3 compliant. The designations T1G and T3G represent different manufacturing batches or tape configurations but carry identical electrical specifications.

Q: Can MBR0540-TP be substituted for B0540W-7 in all applications?

A: MBR0540-TP is functionally equivalent for most applications but exhibits higher forward voltage (550mV versus 510mV) and significantly higher reverse leakage (200µA versus 20µA). Applications sensitive to forward voltage drop or requiring low leakage current should use parts with identical specifications such as B0540W-7-F, MBR0540L-TP, or MBR0540T1G instead.

Q: What is the significance of the SOD-123 package specification?

A: SOD-123 is a surface mount package with specific footprint and lead dimensions. All recommended substitutes maintain SOD-123 packaging except BAT165E6327HTSA1, which uses SOD-323. Parts in SOD-123 are directly interchangeable on existing PCB layouts without redesign. BAT165E6327HTSA1 requires PCB layout modification due to different package geometry.

Q: Does NRVB0540T1G offer advantages over standard MBR0540T1G?

A: NRVB0540T1G includes automotive qualification (AEC-Q101) and is designated for automotive applications. Electrical specifications are identical to MBR0540T1G. Select NRVB0540T1G for automotive designs requiring formal qualification documentation; use MBR0540T1G for general industrial and consumer applications.

Q: Why does BAT165E6327HTSA1 have different electrical characteristics?

A: BAT165E6327HTSA1 is rated for 750mA current capacity compared to 500mA in B0540W-7. Higher current capacity results in different forward voltage (740mV at 750mA) and reverse leakage (50µA) specifications. This part is suitable only for applications requiring increased current handling and can accommodate package redesign from SOD-123 to SOD-323.

Q: What is the temperature range significance for CDBW0540-G?

A: CDBW0540-G operates from -40°C to 125°C, which is narrower than B0540W-7 (-65°C to 150°C). This part is suitable for applications operating within this temperature window. Applications requiring full -65°C to 150°C range should use B0540W-7-F, B0540WQ-7-F, MBR0540-TP, MBR0540T1G, or MBR0540T3G.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original B0540W-7 is RoHS non-compliant. Designs requiring RoHS compliance must transition to compliant alternatives such as B0540W-7-F or equivalent parts.

Q: What packaging options are available for equivalent parts?

A: Substitute parts are supplied in Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), or both configurations. B0540W-7-F is available in Cut Tape & Digi-Reel; B0540WQ-7-F is available in Tape & Reel; MBR0540L-TP and NRVB0540T1G are available in Tape & Reel; MBR0540T1G and MBR0540T3G are available in Cut Tape & Digi-Reel. Verify packaging availability for production volume requirements.

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