B140B-13 Schottky Diode 40V 1A SMB Equivalent & Substitute Parts

Part Overview

The B140B-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40V DC reverse voltage and 1A 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 support and procurement.

Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and high-frequency rectification applications where fast recovery time and low forward voltage drop are required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Capacitance @ Vr, F	110	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the B140B-13 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40V
Current - Average Rectified (Io): 1A (or higher)
Technology: Schottky
Mounting Type: Surface Mount
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Package Compatibility: Substitute parts are grouped into two categories based on package type:

SMB Package (DO-214AA): Direct mechanical and electrical substitutes with identical footprint
Alternative Packages (SMA, SOD-128, SOD-323): Electrical equivalents requiring PCB layout modification

Compliance Considerations: Parts are further differentiated by RoHS compliance status and product lifecycle status (Active vs. Discontinued).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package / Case	Product Status	RoHS Status
B140B-13	Diodes Incorporated	40V	1A	500 mV @ 1A	DO-214AA, SMB	Discontinued	Non-compliant
B140B-13-F	Diodes Incorporated	40V	1A	500 mV @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant
B140BQ-13-F	Diodes Incorporated	40V	1A	500 mV @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant
CMSH1-40 TR13 PBFREE	Central Semiconductor Corp	40V	1A	500 mV @ 1A	DO-214AC, SMA	Active	ROHS3 Compliant
BAT165E6327HTSA1	Infineon Technologies	40V	750mA	740 mV @ 750mA	SC-76, SOD-323	Active	ROHS3 Compliant
PMEG4010EP,115	Nexperia USA Inc.	40V	1A	490 mV @ 1A	SOD-128	Active	ROHS3 Compliant
SK14B	Taiwan Semiconductor Corporation	40V	1A	500 mV @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant
SK34B-LTP	Micro Commercial Co	40V	3A	500 mV @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant
SK44BL-TP	Micro Commercial Co	40V	4A	450 mV @ 4A	DO-214AA, SMB	Active	ROHS3 Compliant
STPS140U	STMicroelectronics	40V	1A	550 mV @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant
STPS1L40U	STMicroelectronics	40V	1A	500 mV @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalents (Identical Electrical and Mechanical Specifications):

The following parts match the B140B-13 across all critical parameters and use the same SMB package:

B140B-13-F (Diodes Incorporated): Active product status with ROHS3 compliance. Identical electrical specifications and packaging. Recommended as primary replacement.
B140BQ-13-F (Diodes Incorporated): Active product with AEC-Q101 automotive qualification and ROHS3 compliance. Suitable for applications requiring automotive-grade components.
SK14B (Taiwan Semiconductor Corporation): Active product with ROHS3 compliance and identical SMB package. Electrical specifications match the original part.
STPS1L40U (STMicroelectronics): Active product with ROHS3 compliance. Identical voltage and current ratings with SMB package compatibility.

Higher Current Capacity Substitutes (Same Package, Increased Current Rating):

These parts provide higher current handling in the same SMB package, suitable for designs requiring additional margin:

SK34B-LTP (Micro Commercial Co): 3A rated current, 40V reverse voltage, SMB package. Active product with ROHS3 compliance.
SK44BL-TP (Micro Commercial Co): 4A rated current, 40V reverse voltage, SMB package. Active product with ROHS3 compliance.

Alternative Package Equivalents (Electrical Match, Different Footprint):

These parts provide electrical equivalence but require PCB layout modification:

CMSH1-40 TR13 PBFREE (Central Semiconductor Corp): 1A, 40V in SMA package (DO-214AC). Smaller footprint than SMB.
PMEG4010EP,115 (Nexperia USA Inc.): 1A, 40V in SOD-128 package. Compact alternative with 490 mV forward voltage.
BAT165E6327HTSA1 (Infineon Technologies): 750mA, 40V in SOD-323 package. Smallest footprint option; current rating is 250mA below original specification.

Compliance Status:

All recommended substitutes are ROHS3 compliant and carry Active product status, ensuring long-term availability and regulatory compliance. The original B140B-13 is RoHS non-compliant and discontinued, making transition to compliant alternatives necessary for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can B140B-13-F be used as a direct replacement for B140B-13?

A: Yes. B140B-13-F is a parametric equivalent with identical electrical specifications (40V, 1A, 500 mV forward voltage) and the same SMB package. The primary difference is product status (Active vs. Discontinued) and RoHS compliance (ROHS3 vs. Non-compliant). B140B-13-F is the recommended replacement.

Q: What is the difference between B140B-13-F and B140BQ-13-F?

A: Both parts are parametric equivalents with identical electrical specifications and SMB packaging. B140BQ-13-F carries AEC-Q101 automotive qualification, making it suitable for automotive applications. B140B-13-F is the standard industrial-grade version. Selection depends on application requirements.

Q: Can SK34B-LTP or SK44BL-TP be used instead of B140B-13?

A: Yes, with design considerations. SK34B-LTP (3A) and SK44BL-TP (4A) both meet the 40V reverse voltage requirement and use the same SMB package. They provide higher current capacity than the original 1A specification, making them suitable for designs requiring additional current margin. Forward voltage characteristics remain within acceptable ranges for most applications.

Q: Why would I choose CMSH1-40 or PMEG4010EP over SMB package alternatives?

A: CMSH1-40 (SMA package) and PMEG4010EP (SOD-128 package) offer smaller footprints than SMB, useful for space-constrained PCB layouts. However, they require PCB redesign. Selection depends on board layout constraints and manufacturing capabilities.

Q: Is BAT165E6327HTSA1 a suitable replacement?

A: BAT165E6327HTSA1 meets the 40V reverse voltage requirement but is rated for 750mA average rectified current, which is 250mA below the original 1A specification. It is suitable only for applications where the actual circuit current does not exceed 750mA. The SOD-323 package is significantly smaller, requiring PCB layout modification.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates the diode's recovery time is 500 nanoseconds or less when switching from forward to reverse bias at currents exceeding 200mA. All listed substitutes meet this specification, ensuring compatibility in high-frequency rectification and switching applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status. The original B140B-13 is RoHS non-compliant. Transition to compliant alternatives is necessary for regulatory adherence in new designs and production.

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

A: Cut Tape (CT) and Digi-Reel® packaging is suitable for manual assembly and small-volume production. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly in high-volume manufacturing. Both formats contain identical components; selection depends on assembly process requirements.

Q: Can I use a substitute part with higher reverse voltage rating?

A: Yes. Parts with higher reverse voltage ratings (e.g., 60V or 100V) are backward compatible with 40V applications. However, this introduces unnecessary cost and may not be required. Selection should match application voltage requirements.

Q: What is the significance of the operating temperature range?

A: The B140B-13 operates from -65°C to 150°C junction temperature. Most substitutes operate to 150°C maximum. For applications requiring the full -65°C to 150°C range, B140B-13-F, B140BQ-13-F, SK34B-LTP, and SK44BL-TP maintain this specification. Verify application temperature requirements before selection.

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