SS12HR3G Equivalent & Substitute Parts

Part Overview

The SS12HR3G 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 component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. The part carries automotive-grade qualification (AEC-Q101) and ROHS3 compliance, making it suitable for automotive and industrial applications requiring fast recovery rectification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 20 V
Technology	Schottky	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS12HR3G is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 20 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 500 mV @ 1 A
Technology: Schottky
Package / Case: DO-214AC, SMA (or compatible surface mount package)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Parametric Equivalent Parts maintain identical electrical specifications and are direct functional replacements:

SS12 (Taiwan Semiconductor Corporation) — Active product status, identical specifications
SS12 R3G (Taiwan Semiconductor Corporation) — Discontinued at DiGi Electronics, identical specifications

Similar Parts meet the core voltage, current, and package requirements but may exhibit variations in secondary parameters such as reverse leakage current, capacitance, or operating temperature range:

B120-13-F (Diodes Incorporated) — Active, SMA package, higher reverse leakage (500 µA vs. 200 µA)
B120B-13-F (Diodes Incorporated) — Active, SMB package variant, higher reverse leakage
B120Q-13-F (Diodes Incorporated) — Active, automotive-qualified, higher reverse leakage
CMSH1-20M BK PBFREE (Central Semiconductor Corp) — Active, bulk packaging, lower capacitance
CMSH1-20M TR13 PBFREE (Central Semiconductor Corp) — Active, tape & reel packaging, lower capacitance
SS12-E3/5AT (Vishay General Semiconductor) — Active, identical base specifications

Higher Current Alternatives exceed the 1 A specification and are suitable only when circuit design permits increased current handling:

B220AQ-13-F (Diodes Incorporated) — 2 A rated, automotive-qualified
SK32A-LTP (Micro Commercial Co) — 3 A rated, not for new designs

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Product Status	AEC-Q101
SS12HR3G	Taiwan Semiconductor	20	1	500 @ 1A	200 @ 20V	DO-214AC (SMA)	Discontinued	Yes
SS12	Taiwan Semiconductor	20	1	500 @ 1A	200 @ 20V	DO-214AC (SMA)	Active	No
SS12 R3G	Taiwan Semiconductor	20	1	500 @ 1A	200 @ 20V	DO-214AC (SMA)	Discontinued	No
B120-13-F	Diodes Incorporated	20	1	500 @ 1A	500 @ 20V	DO-214AC (SMA)	Active	No
B120B-13-F	Diodes Incorporated	20	1	500 @ 1A	500 @ 20V	DO-214AA (SMB)	Active	No
B120Q-13-F	Diodes Incorporated	20	1	500 @ 1A	500 @ 20V	DO-214AC (SMA)	Active	Yes
CMSH1-20M BK PBFREE	Central Semiconductor	20	1	500 @ 1A	500 @ 20V	DO-214AC (SMA)	Active	No
CMSH1-20M TR13 PBFREE	Central Semiconductor	20	1	500 @ 1A	500 @ 20V	DO-214AC (SMA)	Active	No
SS12-E3/5AT	Vishay General Semiconductor	20	1	500 @ 1A	200 @ 20V	DO-214AC (SMA)	Active	No
B220AQ-13-F	Diodes Incorporated	20	2	500 @ 2A	500 @ 20V	DO-214AC (SMA)	Active	Yes
SK32A-LTP	Micro Commercial Co	20	3	500 @ 3A	500 @ 20V	DO-214AC (SMA)	Not For New Designs	No

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

The SS12 (active product status) from Taiwan Semiconductor Corporation is the primary recommended substitute. It maintains identical electrical specifications to the SS12HR3G across all critical parameters: 20 V reverse voltage, 1 A average rectified current, 500 mV forward voltage drop, and 200 µA reverse leakage current. The part is currently in active production with high inventory availability (65,300 pcs), ensuring supply continuity. Both parts share the DO-214AC (SMA) package and fast recovery Schottky technology.

For Automotive Applications Requiring AEC-Q101 Qualification:

The B120Q-13-F (Diodes Incorporated) is an active, automotive-qualified alternative meeting AEC-Q101 requirements. While it maintains the 20 V / 1 A core specifications and DO-214AC (SMA) package, it exhibits higher reverse leakage current (500 µA vs. 200 µA). This part is suitable for automotive designs where AEC-Q101 certification is mandatory and the increased leakage specification is acceptable within circuit design margins.

For Non-Automotive Applications with Active Product Status:

The SS12-E3/5AT (Vishay General Semiconductor) provides parametric equivalence with active product status. It maintains identical electrical specifications including the 200 µA reverse leakage current and DO-214AC (SMA) package. This part is suitable for industrial and consumer applications where automotive qualification is not required.

For Higher Current Requirements:

The B220AQ-13-F (Diodes Incorporated) is rated for 2 A average rectified current while maintaining the 20 V reverse voltage specification and DO-214AC (SMA) package. This part carries AEC-Q101 automotive qualification and is suitable only when circuit design permits increased current handling beyond the original 1 A specification.

Parts to Avoid for New Designs:

The SK32A-LTP (Micro Commercial Co) carries a "Not For New Designs" product status designation and should not be selected for new development projects, despite meeting the core voltage and package specifications.

Frequently Asked Questions (FAQ)

Q: Can the SS12 be used as a direct replacement for the SS12HR3G?

A: Yes. The SS12 is a parametric equivalent with identical electrical specifications: 20 V reverse voltage, 1 A average rectified current, 500 mV forward voltage drop at 1 A, and 200 µA reverse leakage current. Both parts use the DO-214AC (SMA) surface mount package and Schottky technology. The primary difference is product status: SS12 is active while SS12HR3G is discontinued at DiGi Electronics. The SS12 is the recommended substitute for ongoing production.

Q: What is the difference between the B120-13-F and the SS12HR3G?

A: Both parts meet the core specifications of 20 V reverse voltage, 1 A average rectified current, and 500 mV forward voltage drop. The B120-13-F is manufactured by Diodes Incorporated and exhibits higher reverse leakage current (500 µA vs. 200 µA at 20 V). The B120-13-F uses the DO-214AC (SMA) package and is in active production. The increased reverse leakage must be evaluated within specific circuit design requirements to determine acceptability.

Q: Is the B120Q-13-F suitable for automotive applications?

A: Yes. The B120Q-13-F carries AEC-Q101 automotive qualification and is in active production. It maintains the 20 V / 1 A core specifications and DO-214AC (SMA) package. The reverse leakage current is specified at 500 µA, which is higher than the SS12HR3G (200 µA). Automotive designs requiring AEC-Q101 certification can use this part provided the increased leakage specification is acceptable within circuit design margins.

Q: Why do some substitute parts have different reverse leakage current specifications?

A: Reverse leakage current is a secondary parameter that varies among manufacturers and product lines while maintaining the same primary voltage and current ratings. The SS12HR3G specifies 200 µA reverse leakage, while many Diodes Incorporated and Central Semiconductor alternatives specify 500 µA. Both values are within acceptable ranges for Schottky rectifier applications. Circuit designers must verify that the higher leakage specification does not exceed design requirements for power dissipation or standby current consumption.

Q: Can the B220AQ-13-F be used in place of the SS12HR3G?

A: The B220AQ-13-F can be used only if circuit design permits increased current handling. This part is rated for 2 A average rectified current compared to the SS12HR3G's 1 A rating. Both maintain the 20 V reverse voltage specification and DO-214AC (SMA) package. The B220AQ-13-F carries AEC-Q101 automotive qualification. Use this part only when the circuit design requires or can accommodate the higher current rating.

Q: What is the difference between the CMSH1-20M BK PBFREE and CMSH1-20M TR13 PBFREE?

A: Both parts are manufactured by Central Semiconductor Corp and maintain identical electrical specifications: 20 V reverse voltage, 1 A average rectified current, and 500 mV forward voltage drop. The primary difference is packaging: CMSH1-20M BK PBFREE is supplied in bulk packaging, while CMSH1-20M TR13 PBFREE is supplied in tape & reel (TR) format. The tape & reel version (TR13) is more suitable for automated assembly processes. Both parts are in active production.

Q: Is the SS12-E3/5AT a suitable replacement for the SS12HR3G?

A: Yes. The SS12-E3/5AT is manufactured by Vishay General Semiconductor and maintains parametric equivalence with the SS12HR3G: 20 V reverse voltage, 1 A average rectified current, 500 mV forward voltage drop, and 200 µA reverse leakage current. Both use the DO-214AC (SMA) package. The SS12-E3/5AT is in active production and suitable for applications where automotive qualification is not required.

Q: Why is the SK32A-LTP listed but not recommended?

A: The SK32A-LTP carries a "Not For New Designs" product status designation from the manufacturer. While it meets the core voltage and package specifications, this status indicates the manufacturer is discontinuing or has discontinued active support for new design implementations. New projects should select from parts with "Active" product status to ensure long-term supply availability and manufacturer support.

Q: What packaging options are available for equivalent parts?

A: The SS12HR3G uses DO-214AC (SMA) surface mount packaging. Most direct equivalents maintain this package type. The B120B-13-F variant uses DO-214AA (SMB) packaging, which is a larger surface mount package and requires different PCB footprint design. When selecting substitutes, verify that the package type matches the PCB layout and assembly equipment capabilities. The majority of recommended substitutes maintain the DO-214AC (SMA) package for direct compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance status, matching the SS12HR3G specification. This ensures compatibility with environmental and regulatory requirements across automotive, industrial, and consumer applications.

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