SS12T3 Equivalent & Substitute Parts

Part Overview

The SS12T3 is a Schottky rectifier diode manufactured by onsemi, rated for 20 V DC reverse voltage and 1 A average rectified current in a surface mount SMA package (DO-214AC). This component is classified as obsolete, making equivalent and substitute parts necessary 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 switching applications where fast recovery characteristics are required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	470 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	45	µA @ 20 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SS12T3 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: DO-214AC or SMA compatible

Secondary Compatibility Factors:

Forward voltage (Vf) characteristics
Reverse leakage current
Operating temperature range
Recovery speed classification
RoHS and regulatory compliance status

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (20 V, 1 A) Parts with identical voltage and current ratings, suitable for direct replacement in existing designs.

Category 2: Higher Current Ratings (20 V, 2 A or 3 A) Parts with higher current capacity that maintain the same voltage rating and package form factor. These provide design margin and are electrically compatible with 1 A circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Temp Range	Product Status	RoHS Status
SS12T3	onsemi	20 V	1 A	470 mV @ 1 A	45 µA @ 20 V	DO-214AC, SMA	-55°C ~ 150°C	Obsolete	Non-compliant
SS12	Taiwan Semiconductor Corporation	20 V	1 A	500 mV @ 1 A	200 µA @ 20 V	DO-214AC, SMA	-55°C ~ 125°C	Active	ROHS3 Compliant
B120-13-F	Diodes Incorporated	20 V	1 A	500 mV @ 1 A	500 µA @ 20 V	DO-214AC, SMA	-65°C ~ 150°C	Active	ROHS3 Compliant
B120Q-13-F	Diodes Incorporated	20 V	1 A	500 mV @ 1 A	500 µA @ 20 V	DO-214AC, SMA	-65°C ~ 150°C	Active	ROHS3 Compliant
SS12-E3/61T	Vishay General Semiconductor - Diodes Division	20 V	1 A	500 mV @ 1 A	200 µA @ 20 V	DO-214AC, SMA	-65°C ~ 125°C	Active	ROHS3 Compliant
B220A-13-F	Diodes Incorporated	20 V	2 A	500 mV @ 2 A	500 µA @ 20 V	DO-214AC, SMA	-65°C ~ 150°C	Active	ROHS3 Compliant
B220AQ-13-F	Diodes Incorporated	20 V	2 A	500 mV @ 2 A	500 µA @ 20 V	DO-214AC, SMA	-65°C ~ 150°C	Active	ROHS3 Compliant
B320A-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	DO-214AC, SMA	-55°C ~ 150°C	Active	ROHS3 Compliant
CD1607-B120LLF	Bourns Inc.	20 V	1 A	380 mV @ 1 A	1 mA @ 20 V	SOD-123T	-55°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Same Voltage and Current Rating):

For applications requiring exact functional equivalence to the SS12T3, the following active parts are suitable:

SS12 (Taiwan Semiconductor Corporation): Active product with identical 20 V / 1 A ratings and ROHS3 compliance. Slightly higher reverse leakage (200 µA vs. 45 µA) and forward voltage (500 mV vs. 470 mV) are within acceptable tolerance for most applications.
B120-13-F (Diodes Incorporated): Active product with extended temperature range (-65°C to 150°C) and ROHS3 compliance. Suitable for designs requiring wider operating temperature coverage.
B120Q-13-F (Diodes Incorporated): Automotive-grade variant with AEC-Q101 qualification. Recommended for automotive and mission-critical applications requiring formal qualification documentation.
SS12-E3/61T (Vishay General Semiconductor - Diodes Division): Active product in tape and reel packaging with ROHS3 compliance and extended lower temperature rating (-65°C).

Higher Current Capacity Alternatives (20 V, 2 A or 3 A):

For designs where additional current margin is beneficial:

B220A-13-F (Diodes Incorporated): 2 A rated, active product with ROHS3 compliance and extended temperature range.
B220AQ-13-F (Diodes Incorporated): Automotive-grade 2 A variant with AEC-Q101 qualification.
B320A-13-F (Diodes Incorporated): 3 A rated, automotive-grade with AEC-Q101 qualification and extended temperature range.

Package Consideration:

CD1607-B120LLF (Bourns Inc.): Uses SOD-123T (2-Mini-SMA) package instead of standard SMA. Suitable only if PCB layout accommodates this smaller form factor. Lower forward voltage (380 mV) may provide efficiency benefits in power applications.

All recommended substitutes are active products with ROHS3 compliance, addressing the obsolescence and regulatory compliance limitations of the original SS12T3.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current-rated diode (2 A or 3 A) as a substitute for the 1 A SS12T3?

A: Yes. The B220A-13-F (2 A) and B320A-13-F (3 A) are electrically compatible with 1 A circuit requirements. Higher current ratings provide design margin and do not degrade circuit performance. All parameters except current capacity remain equivalent or superior.

Q: What is the difference between B120-13-F and B120Q-13-F?

A: Both are 20 V / 1 A Schottky diodes from Diodes Incorporated with identical electrical specifications. B120Q-13-F includes automotive-grade qualification (AEC-Q101) and is supplied in tape and reel packaging. B120-13-F is supplied in cut tape and digi-reel packaging. Selection depends on packaging requirements and whether automotive qualification is necessary.

Q: Is the CD1607-B120LLF package compatible with my existing PCB design?

A: The CD1607-B120LLF uses SOD-123T (2-Mini-SMA) package, which is physically smaller than the standard DO-214AC (SMA) package used by the SS12T3. This part is suitable only if your PCB footprint accommodates the smaller form factor. Verify footprint compatibility before selection.

Q: What is the significance of the higher reverse leakage current in substitute parts?

A: The SS12T3 specifies 45 µA reverse leakage at 20 V, while most substitutes specify 200 µA to 500 µA. For most applications, this difference is negligible. In high-impedance or precision analog circuits, verify that the higher leakage current does not exceed circuit requirements.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original SS12T3 is RoHS non-compliant, making compliant substitutes necessary for new designs and procurement in regulated markets.

Q: Can I substitute the SS12T3 with the SS12 from Taiwan Semiconductor Corporation?

A: Yes. The SS12 is a direct functional equivalent with identical 20 V / 1 A ratings, same package (DO-214AC, SMA), and active product status. Minor differences in forward voltage (500 mV vs. 470 mV) and reverse leakage (200 µA vs. 45 µA) are within acceptable tolerance for standard rectification applications.

Q: What is the advantage of Vishay's SS12-E3/61T over other substitutes?

A: The SS12-E3/61T offers extended lower temperature rating (-65°C vs. -55°C) and is supplied in tape and reel packaging. It is suitable for applications requiring wider temperature coverage and automated assembly processes.

Q: Should I select an automotive-qualified part if my application is not automotive?

A: Automotive-qualified parts (B120Q-13-F, B220AQ-13-F, B320A-13-F) meet stricter reliability and qualification standards. Selection is not required for non-automotive applications but provides additional assurance of quality and consistency. These parts are suitable for any application where enhanced reliability is valued.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message