SS12 R3G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS12 R3G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 20 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for existing designs and new production requirements.

Key Parameters

Parameter	Value
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	200 µA @ 20 V
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SS12 R3G is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 500 mV @ 1 A (or equivalent current rating)
Speed: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: Must not exceed 200 µA @ 20 V

Mechanical Compatibility Requirements:

Package / Case: Must be DO-214AC or SMA equivalent
Mounting Type: Must be Surface Mount
Operating Temperature - Junction: Must support -55°C ~ 125°C minimum range

Compliance Requirements:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): Level 1 (Unlimited)

Substitute parts are grouped into two categories: parametric equivalents (identical electrical and mechanical specifications) and similar parts (meeting or exceeding all critical parameters with minor variations in secondary characteristics).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Tj (Operating)	Product Status
SS12 R3G	Taiwan Semiconductor Corporation	20 V	1 A	500 mV @ 1 A	200 µA @ 20 V	DO-214AC, SMA	-55°C ~ 125°C	Discontinued
SS12	Taiwan Semiconductor Corporation	20 V	1 A	500 mV @ 1 A	200 µA @ 20 V	DO-214AC, SMA	-55°C ~ 125°C	Active
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
B120-E3/5AT	Vishay General Semiconductor - Diodes Division	20 V	1 A	520 mV @ 1 A	200 µA @ 20 V	DO-214AC, SMA	-65°C ~ 125°C	Active
B120-E3/61T	Vishay General Semiconductor - Diodes Division	20 V	1 A	520 mV @ 1 A	200 µA @ 20 V	DO-214AC, SMA	-65°C ~ 125°C	Active
B120-M3/5AT	Vishay General Semiconductor - Diodes Division	20 V	1 A	520 mV @ 1 A	200 µA @ 20 V	DO-214AC, SMA	-65°C ~ 150°C	Active
B120-M3/61T	Vishay General Semiconductor - Diodes Division	20 V	1 A	520 mV @ 1 A	200 µA @ 20 V	DO-214AC, SMA	-65°C ~ 150°C	Active
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
B120B-13-F	Diodes Incorporated	20 V	1 A	500 mV @ 1 A	500 µA @ 20 V	DO-214AA, SMB	-65°C ~ 150°C	Active
BYS10-25-E3/TR	Vishay General Semiconductor - Diodes Division	25 V	1.5 A	500 mV @ 1 A	500 µA @ 25 V	DO-214AC, SMA	-65°C ~ 150°C	Active
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

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

The SS12 manufactured by Taiwan Semiconductor Corporation is a parametric equivalent to the discontinued SS12 R3G. This part maintains identical electrical specifications (20 V, 1 A, 500 mV forward voltage, 200 µA reverse leakage) and mechanical compatibility (DO-214AC SMA package). The SS12 is currently in active production status with high inventory availability (65,300 pcs), making it the primary replacement for discontinued SS12 R3G applications.

Similar Substitutes (Electrical Compatibility with Enhanced Specifications):

The following parts meet or exceed all critical electrical and mechanical parameters of the SS12 R3G:

Vishay B120 Series (Tape & Reel Packaging):

B120-E3/5AT, B120-E3/61T, B120-M3/5AT, B120-M3/61T: These parts maintain 20 V reverse voltage and 1 A current ratings with forward voltage of 520 mV @ 1 A (20 mV higher than original). Operating temperature range extends to -65°C ~ 125°C or -65°C ~ 150°C. Available in Tape & Reel packaging.

Diodes Incorporated B120 Series (SMA Package):

B120-13-F: Maintains 20 V and 1 A ratings with 500 mV forward voltage. Reverse leakage is 500 µA @ 20 V (higher than original 200 µA). Operating temperature extends to -65°C ~ 150°C. Available in Cut Tape & Digi-Reel packaging.
B120Q-13-F: Identical to B120-13-F with automotive-grade qualification (AEC-Q101). Suitable for automotive applications requiring enhanced reliability.

Higher Current Capability:

B220AQ-13-F: Rated for 2 A average rectified current at 20 V reverse voltage. Provides current margin for applications requiring higher current capacity while maintaining 20 V voltage rating and SMA package compatibility. Automotive-grade with AEC-Q101 qualification.

Higher Voltage Capability:

BYS10-25-E3/TR: Rated for 25 V reverse voltage and 1.5 A current. Provides voltage and current margin for applications with higher stress conditions. Maintains DO-214AC SMA package compatibility.

Package Variant:

B120B-13-F: SMB package variant (DO-214AA) of the B120 series. Suitable only for designs that accommodate larger SMB footprint. Not recommended for direct replacement of SMA-packaged SS12 R3G without PCB redesign.

All recommended substitutes are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.

Frequently Asked Questions (FAQ)

Q: Can the SS12 directly replace the discontinued SS12 R3G?

A: Yes. The SS12 is a parametric equivalent with identical electrical specifications (20 V, 1 A, 500 mV forward voltage) and mechanical compatibility (DO-214AC SMA package). The part is currently in active production with high inventory availability.

Q: What is the difference between the Vishay B120-E3 and B120-M3 series?

A: Both series maintain identical electrical specifications (20 V, 1 A, 520 mV forward voltage). The B120-M3 series extends the maximum operating junction temperature to -65°C ~ 150°C, compared to -65°C ~ 125°C for the B120-E3 series. Selection depends on application temperature requirements.

Q: Can I use B120-13-F as a direct replacement for SS12 R3G?

A: B120-13-F is electrically compatible with identical 20 V and 1 A ratings and 500 mV forward voltage. However, reverse leakage current is 500 µA @ 20 V compared to the original 200 µA @ 20 V. This higher leakage may affect low-power or precision applications. Operating temperature range is extended to -65°C ~ 150°C. Verify application requirements before substitution.

Q: What is the advantage of B120Q-13-F over B120-13-F?

A: B120Q-13-F is automotive-grade with AEC-Q101 qualification, indicating enhanced reliability testing and quality assurance suitable for automotive applications. Electrical specifications are identical to B120-13-F. Selection depends on application requirements for automotive-grade components.

Q: Can I use B220AQ-13-F (2 A rated) instead of SS12 R3G (1 A rated)?

A: B220AQ-13-F is electrically compatible with 20 V reverse voltage and SMA package. The 2 A current rating provides margin above the 1 A requirement of SS12 R3G. This substitution is suitable for applications where higher current capacity is beneficial or required. Verify that the higher current rating does not introduce thermal or design complications.

Q: Why would I choose BYS10-25-E3/TR over SS12 R3G?

A: BYS10-25-E3/TR provides higher voltage (25 V) and current (1.5 A) ratings compared to SS12 R3G (20 V, 1 A). This substitution is appropriate for applications with higher voltage stress or current requirements, or where design margin is desired. The part maintains DO-214AC SMA package compatibility.

Q: Is B120B-13-F compatible with SS12 R3G PCB layouts?

A: B120B-13-F uses SMB package (DO-214AA) instead of the SMA package (DO-214AC) of SS12 R3G. These packages have different footprints and pin configurations. B120B-13-F is not compatible with existing SS12 R3G PCB layouts without redesign. Use only if PCB modification is feasible.

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

A: This specification indicates the diode exhibits fast recovery characteristics with recovery time not exceeding 500 nanoseconds for reverse currents greater than 200 milliamps. This parameter is critical for high-frequency switching applications. All recommended substitutes maintain this specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance profile of the original SS12 R3G.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) packaging formats. Selection depends on procurement and assembly requirements. Verify packaging compatibility with your supply chain and assembly processes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message