Equivalent & Substitute Parts for B120B-13 Schottky Diode

Part Overview

The B120B-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 20 V DC reverse voltage and 1 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 diode features fast recovery characteristics suitable for switching power supply and rectification circuits requiring low forward voltage drop and rapid switching performance.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 1 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 20 V	—
Capacitance @ Vr, F	110 pF @ 4V, 1MHz	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65°C ~ 150°C	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the B120B-13 is determined by the following critical parameters: Schottky technology, 20 V maximum reverse voltage rating, 1 A average rectified current capacity, fast recovery speed characteristic, DO-214AA (SMB) package form factor, and operating temperature range of -65°C to 150°C.

Substitute parts are grouped into two categories:

Direct Parametric Equivalents: Parts that match all electrical specifications and package requirements of the B120B-13, differing only in packaging format (Tape & Reel versus bulk) or compliance status. These include B120B-13-F and B120BQ-13-F from Diodes Incorporated.

Manufacturer Recommended Alternatives: Parts that maintain the same voltage and current ratings with identical or superior electrical characteristics but may originate from different manufacturers or possess enhanced qualification status. The CMSH1-20 TR13 PBFREE from Central Semiconductor Corp meets all parametric requirements. The SK32B-LTP and SK42BL-TP from Micro Commercial Co provide higher current ratings (3 A and 4 A respectively) within the same package and voltage class, suitable for applications where current margin is required.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Package	Temp Range	Product Status	RoHS Status
B120B-13	Diodes Incorporated	20 V	1	500 mV @ 1 A	DO-214AA, SMB	-65°C ~ 150°C	Discontinued	Non-compliant
B120B-13-F	Diodes Incorporated	20 V	1	500 mV @ 1 A	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
B120BQ-13-F	Diodes Incorporated	20 V	1	500 mV @ 1 A	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
CMSH1-20 TR13 PBFREE	Central Semiconductor Corp	20 V	1	550 mV @ 1 A	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SK32B-LTP	Micro Commercial Co	20 V	3	500 mV @ 3 A	DO-214AA, SMB	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant
SK42BL-TP	Micro Commercial Co	20 V	4	450 mV @ 4 A	DO-214AA, SMB	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement: B120B-13-F is the primary substitute, offering identical electrical specifications to the B120B-13 with active product status and ROHS3 compliance. This part is suitable for all applications previously using the discontinued B120B-13.

For Automotive Applications: B120BQ-13-F provides the same electrical performance as B120B-13-F with AEC-Q101 automotive qualification and Automotive grade designation, appropriate for automotive and mission-critical applications requiring formal qualification documentation.

For Alternative Sourcing: CMSH1-20 TR13 PBFREE from Central Semiconductor Corp maintains identical voltage and current ratings with a maximum forward voltage of 550 mV at 1 A (compared to 500 mV for the B120B-13). This 50 mV difference is within typical design margins for most rectification applications and provides an alternative supply source.

For Higher Current Margin: SK32B-LTP and SK42BL-TP provide 3 A and 4 A current ratings respectively within the same DO-214AA package and 20 V voltage class. These parts are designated "Not For New Designs" but remain available for legacy system support and applications requiring additional current capacity. The SK42BL-TP exhibits superior forward voltage characteristics at 450 mV at 4 A.

Compliance Consideration: The original B120B-13 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting transition to current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can B120B-13-F be used as a direct replacement for B120B-13?

A: Yes. B120B-13-F is electrically and mechanically identical to B120B-13, with the primary difference being active product status and ROHS3 compliance. Both parts share the same voltage rating (20 V), current rating (1 A), forward voltage characteristic (500 mV @ 1 A), and DO-214AA SMB package.

Q: What is the difference between B120B-13-F and B120BQ-13-F?

A: Both parts are electrically identical with 20 V reverse voltage and 1 A current ratings. B120BQ-13-F includes AEC-Q101 automotive qualification and Automotive grade designation, making it suitable for automotive applications requiring formal qualification. B120B-13-F is the standard industrial version.

Q: Why does CMSH1-20 TR13 PBFREE have a higher forward voltage (550 mV vs 500 mV)?

A: Forward voltage variation within 50 mV is typical across different Schottky diode manufacturers and process variations. The CMSH1-20 TR13 PBFREE remains functionally equivalent for most rectification applications. Design margins should account for this specification difference in critical applications.

Q: Can SK32B-LTP or SK42BL-TP be used in place of B120B-13?

A: These parts are electrically compatible with the same 20 V reverse voltage rating and DO-214AA package. However, they provide higher current ratings (3 A and 4 A respectively) than the original 1 A specification. They are suitable for applications where additional current capacity is beneficial or required. Both parts are designated "Not For New Designs," indicating limited future availability.

Q: What is the significance of the packaging designation "Tape & Reel (TR)" versus bulk packaging?

A: Tape & Reel packaging is standard for automated assembly processes and high-volume production. The electrical and mechanical specifications remain identical; the difference is in delivery format and handling method. B120B-13-F and B120BQ-13-F are available in Tape & Reel format, suitable for pick-and-place assembly equipment.

Q: Are there temperature range differences between substitute parts?

A: The B120B-13, B120B-13-F, B120BQ-13-F, and CMSH1-20 TR13 PBFREE all operate from -65°C to 150°C. The SK32B-LTP and SK42BL-TP have a slightly narrower range of -55°C to 150°C, which is acceptable for most industrial and commercial applications but may not be suitable for extreme low-temperature environments requiring -65°C operation.

Q: Is the B120B-13 still available for purchase?

A: The B120B-13 is discontinued at DiGi Electronics. B120B-13-F is the active replacement part from the same manufacturer with identical specifications and improved compliance status.

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