B350B-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B350B-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 3 A 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 production and repair applications. The device operates across a junction temperature range of -55°C to 150°C and exhibits fast recovery characteristics suitable for high-frequency rectification circuits.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 3 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 50 V	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55°C to 150°C	—

Substitute Part Grouping Explanation

Substitution of the B350B-13 is determined by the following critical parameters:

Voltage Rating (Vr): The reverse voltage rating must equal or exceed 50 V. Parts rated below 50 V cannot be substituted without circuit redesign.

Current Rating (Io): The average rectified current must equal or exceed 3 A. Parts rated below 3 A cannot sustain the required load.

Technology: Schottky diode technology is required to maintain fast recovery characteristics and forward voltage performance.

Package: Surface mount DO-214AA (SMB) package is required for mechanical and thermal compatibility.

Speed Characteristic: Fast recovery ≤ 500ns at > 200mA is required for high-frequency operation.

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting or exceeding all critical parameters (50 V, 3 A, Schottky, SMB package, fast recovery).

Functional Alternatives: Parts with reduced voltage or current ratings that may be suitable for specific circuit applications where the full 50 V / 3 A specification is not required.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Package	Product Status	RoHS Status
B350B-13	Diodes Incorporated	50 V	3 A	700 mV @ 3 A	DO-214AA, SMB	Discontinued	Non-compliant
B350B-13-F	Diodes Incorporated	50 V	3 A	700 mV @ 3 A	DO-214AA, SMB	Active	ROHS3 Compliant
CMSH3-60M TR13 PBFREE	Central Semiconductor Corp	60 V	3 A	750 mV @ 3 A	DO-214AA, SMB	Active	ROHS3 Compliant
SK35B-LTP	Micro Commercial Co	50 V	3 A	750 mV @ 3 A	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant
STPS140U	STMicroelectronics	40 V	1 A	550 mV @ 1 A	DO-214AA, SMB	Active	ROHS3 Compliant
STPS1L40U	STMicroelectronics	40 V	1 A	500 mV @ 1 A	DO-214AA, SMB	Active	ROHS3 Compliant
STPS1L40UY	STMicroelectronics	40 V	1 A	500 mV @ 1 A	DO-214AA, SMB	Active	ROHS3 Compliant
STPS2L40U	STMicroelectronics	40 V	2 A	430 mV @ 2 A	DO-214AA, SMB	Active	ROHS3 Compliant
STPS340U	STMicroelectronics	40 V	3 A	630 mV @ 3 A	DO-214AA, SMB	Active	ROHS3 Compliant
STPS340UY	STMicroelectronics	40 V	3 A	630 mV @ 3 A	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

B350B-13-F (Diodes Incorporated) is the direct equivalent to the discontinued B350B-13. This part maintains identical electrical specifications: 50 V reverse voltage, 3 A average rectified current, 700 mV forward voltage at 3 A, and DO-214AA SMB package. The B350B-13-F is currently active in production and carries ROHS3 compliance, addressing regulatory requirements that the original part does not meet. This part is available in Tape & Reel packaging with 10,400 units in stock.

Secondary Equivalent (Higher Voltage Rating):

CMSH3-60M TR13 PBFREE (Central Semiconductor Corp) provides a 60 V reverse voltage rating with identical 3 A current capacity. This part is suitable for applications where additional voltage margin is beneficial. Forward voltage is 750 mV at 3 A, representing a 50 mV increase over the B350B-13. Operating temperature range extends to -65°C minimum. ROHS3 compliance is confirmed. Inventory availability is high at 95,858 units.

Functional Alternatives (Reduced Specifications):

Parts from STMicroelectronics (STPS140U, STPS1L40U, STPS1L40UY, STPS2L40U, STPS340U, STPS340UY) operate at 40 V maximum reverse voltage, which is below the 50 V specification of the B350B-13. These parts are suitable only for circuits where the actual operating voltage does not exceed 40 V. The STPS340U and STPS340UY maintain the 3 A current rating but with reduced voltage headroom. All STMicroelectronics parts carry ROHS3 compliance and are in active production status.

Legacy Alternative (Not Recommended for New Designs):

SK35B-LTP (Micro Commercial Co) matches the 50 V / 3 A specification but carries a "Not For New Designs" product status designation. This part is ROHS3 compliant but should not be selected for new circuit designs.

Frequently Asked Questions (FAQ)

Q: Can I use STPS340U or STPS340UY as a direct replacement for B350B-13?

A: No. While STPS340U and STPS340UY maintain the 3 A current rating, they are rated for 40 V maximum reverse voltage compared to the B350B-13's 50 V rating. These parts are suitable only if your circuit operates at voltages not exceeding 40 V. If your circuit requires 50 V capability, use B350B-13-F or CMSH3-60M TR13 PBFREE instead.

Q: What is the difference between B350B-13 and B350B-13-F?

A: B350B-13-F is the active production equivalent of the discontinued B350B-13. Both parts have identical electrical specifications: 50 V reverse voltage, 3 A current, 700 mV forward voltage at 3 A, and DO-214AA SMB package. The primary difference is product status (B350B-13-F is active) and RoHS compliance (B350B-13-F is ROHS3 compliant). B350B-13-F is available in Tape & Reel packaging.

Q: Is CMSH3-60M TR13 PBFREE a suitable substitute?

A: Yes. CMSH3-60M TR13 PBFREE is a suitable substitute with enhanced voltage rating (60 V vs. 50 V). It maintains the 3 A current capacity and DO-214AA SMB package. Forward voltage is 750 mV at 3 A, which is 50 mV higher than the B350B-13. This part is ROHS3 compliant and in active production with high inventory availability.

Q: Why are STMicroelectronics STPS parts listed as alternatives if they have lower voltage ratings?

A: STMicroelectronics STPS parts are listed as functional alternatives for applications where the actual circuit voltage does not exceed 40 V. These parts are not direct replacements for the B350B-13 due to reduced voltage rating. They are included to provide options for circuits with lower voltage requirements. Always verify that your circuit's maximum operating voltage does not exceed the substitute part's rating.

Q: What packaging options are available for substitute parts?

A: B350B-13-F is available in Tape & Reel (TR) packaging. CMSH3-60M TR13 PBFREE is available in Tape & Reel (TR) packaging. SK35B-LTP is available in Tape & Reel (TR) packaging. STMicroelectronics parts are available in Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR) packaging depending on the specific part number. Verify packaging requirements for your assembly process before selection.

Q: Are all substitute parts RoHS compliant?

A: B350B-13-F, CMSH3-60M TR13 PBFREE, SK35B-LTP, and all STMicroelectronics parts listed are ROHS3 compliant. The original B350B-13 is RoHS non-compliant. If RoHS compliance is required, select B350B-13-F as the primary substitute.

Q: What is the operating temperature range for substitute parts?

A: B350B-13 and B350B-13-F operate from -55°C to 150°C junction temperature. CMSH3-60M TR13 PBFREE extends the minimum to -65°C. STMicroelectronics STPS140U, STPS1L40U, STPS2L40U, and STPS340U are rated to 150°C maximum only (no minimum specified). STPS1L40UY and STPS340UY (automotive grade) operate from -40°C to 150°C. Verify temperature requirements for your application.

Q: Can I use SK35B-LTP for new designs?

A: No. SK35B-LTP carries a "Not For New Designs" product status. While it meets the 50 V / 3 A specification, it should not be selected for new circuit designs. Use B350B-13-F instead.

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