SS12T3G Equivalent & Substitute Parts

Part Overview

The SS12T3G 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. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a junction temperature range of -55°C to 150°C and features fast recovery characteristics suitable for switching applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the SS12T3G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 20 V (exact match required)
Current - Average Rectified (Io): 1 A (minimum requirement)
Package / Case: DO-214AC, SMA (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Technology: Schottky (functional equivalence)

Secondary Compatibility Factors:

Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature Range: Must accommodate application requirements
Forward Voltage (Vf): Acceptable within circuit design margins
Reverse Leakage Current: Must not exceed circuit specifications

Substitute parts are grouped into two categories:

Category 1: Direct 1 A Equivalents – Parts with identical 20 V / 1 A ratings in DO-214AC SMA packaging, suitable for direct replacement in existing designs.

Category 2: Higher Current Ratings (2 A, 3 A) – Parts with 20 V reverse voltage but elevated current ratings, usable in applications where the original 1 A specification provides design margin or where higher current capacity is beneficial.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Status	Temp Range	RoHS
SS12T3G	onsemi	20 V	1 A	470 mV @ 1 A	DO-214AC, SMA	Obsolete	-55°C ~ 150°C	Not Specified
SS12	Taiwan Semiconductor Corporation	20 V	1 A	500 mV @ 1 A	DO-214AC, SMA	Active	-55°C ~ 125°C	ROHS3 Compliant
B120-13-F	Diodes Incorporated	20 V	1 A	500 mV @ 1 A	DO-214AC, SMA	Active	-65°C ~ 150°C	ROHS3 Compliant
B120Q-13-F	Diodes Incorporated	20 V	1 A	500 mV @ 1 A	DO-214AC, SMA	Active	-65°C ~ 150°C	ROHS3 Compliant
B220A-13-F	Diodes Incorporated	20 V	2 A	500 mV @ 2 A	DO-214AC, SMA	Active	-65°C ~ 150°C	ROHS3 Compliant
B220AQ-13-F	Diodes Incorporated	20 V	2 A	500 mV @ 2 A	DO-214AC, SMA	Active	-65°C ~ 150°C	ROHS3 Compliant
B320A-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	DO-214AC, SMA	Active	-55°C ~ 150°C	ROHS3 Compliant
SS12-E3/61T	Vishay General Semiconductor - Diodes Division	20 V	1 A	500 mV @ 1 A	DO-214AC, SMA	Active	-65°C ~ 125°C	ROHS3 Compliant
CD1607-B120LLF	Bourns Inc.	20 V	1 A	380 mV @ 1 A	SOD-123T (2-Mini-SMA)	Active	-55°C ~ 125°C	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (1 A Rating):

The following parts provide direct functional equivalence to the SS12T3G with identical 20 V / 1 A specifications:

SS12 (Taiwan Semiconductor Corporation): Active status with ROHS3 compliance. Operating temperature range of -55°C to 125°C is suitable for applications not requiring the full -55°C to 150°C range of the original part.
B120-13-F (Diodes Incorporated): Active status with ROHS3 compliance. Extended lower temperature rating (-65°C) and full upper temperature rating (150°C) match or exceed the original specification. Available in Cut Tape and Digi-Reel packaging.
B120Q-13-F (Diodes Incorporated): Active status with ROHS3 compliance and AEC-Q101 automotive qualification. Identical electrical specifications to B120-13-F with automotive-grade reliability. Supplied in Tape & Reel packaging.
SS12-E3/61T (Vishay General Semiconductor - Diodes Division): Active status with ROHS3 compliance. Functionally equivalent with extended lower temperature rating (-65°C). Supplied in Tape & Reel packaging.

Higher Current Alternatives (2 A and 3 A Ratings):

These parts maintain the 20 V reverse voltage specification but provide elevated current capacity:

B220A-13-F (Diodes Incorporated): 2 A rating, active status, ROHS3 compliant. Suitable for applications requiring additional current margin or where 2 A capacity is specified.
B220AQ-13-F (Diodes Incorporated): 2 A rating with AEC-Q101 automotive qualification, active status, ROHS3 compliant. Supplied in Tape & Reel packaging.
B320A-13-F (Diodes Incorporated): 3 A rating with AEC-Q101 automotive qualification, active status, ROHS3 compliant. Provides maximum current capacity within the 20 V family.

Package Consideration:

CD1607-B120LLF (Bourns Inc.): Maintains 20 V / 1 A specifications but uses SOD-123T (2-Mini-SMA) package instead of standard DO-214AC SMA. This part is suitable only for designs where the smaller package footprint is compatible with PCB layout and assembly equipment.

Frequently Asked Questions (FAQ)

Q: Can I use a 2 A or 3 A rated diode as a substitute for the 1 A SS12T3G?

A: Yes. The B220A-13-F (2 A) and B320A-13-F (3 A) are electrically compatible substitutes. Higher current ratings do not prevent operation in 1 A applications. The diode will operate within its safe operating area. Verify that the forward voltage drop and reverse leakage current specifications are acceptable for your circuit design.

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

A: Both parts have identical electrical specifications (20 V / 1 A). The primary difference is packaging: B120-13-F is supplied in Cut Tape and Digi-Reel format, while B120Q-13-F is supplied in Tape & Reel format. B120Q-13-F also carries AEC-Q101 automotive qualification. Select based on your procurement and assembly requirements.

Q: Is the CD1607-B120LLF a suitable substitute?

A: The CD1607-B120LLF meets the electrical requirements (20 V / 1 A) but uses a different package (SOD-123T / 2-Mini-SMA) instead of the standard DO-214AC SMA. This part is suitable only if your PCB layout and assembly equipment support the smaller 2-Mini-SMA footprint. Verify mechanical compatibility before selection.

Q: Why does the SS12T3G show as obsolete?

A: The SS12T3G is classified as obsolete by onsemi. Multiple active alternatives from other manufacturers provide equivalent or superior specifications, ensuring design continuity and supply chain reliability.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. All recommended active substitutes carry ROHS3 compliance, ensuring regulatory alignment for new designs and procurement.

Q: Can I substitute the SS12T3G with the SS12 from Taiwan Semiconductor Corporation?

A: Yes. The SS12 provides direct electrical equivalence with 20 V / 1 A specifications in the same DO-214AC SMA package. The operating temperature range (-55°C to 125°C) is slightly narrower than the original (-55°C to 150°C), so verify that your application does not require operation above 125°C.

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

A: This specification indicates the diode's reverse recovery time is 500 nanoseconds or less when switching currents greater than 200 mA. All substitute parts maintain this fast recovery characteristic, ensuring compatibility in switching applications.

Q: Are there any differences in forward voltage drop between substitutes?

A: The original SS12T3G specifies 470 mV maximum forward voltage at 1 A. Most substitutes specify 500 mV at 1 A, representing a 30 mV difference. The CD1607-B120LLF specifies 380 mV at 1 A, which is lower. Verify that your circuit design accommodates these variations in forward voltage drop.

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