Equivalent & Substitute Parts for SS12/54 Schottky Diode

Part Overview

The SS12/54 is a 20V, 1A Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division in DO-214AC (SMA) surface mount package. This component is classified as Active and serves as a fast recovery diode suitable for low-voltage rectification applications. The SS12/54 is RoHS non-compliant, which may necessitate identification of compliant alternatives for new designs or applications with regulatory requirements. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the Schottky diode category.

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
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65°C ~ 125°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SS12/54 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 20V minimum
Current - Average Rectified (Io): 1A minimum
Voltage - Forward (Vf) (Max) @ If: 500 mV or lower @ 1A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Technology: Schottky

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: DO-214AC (SMA) or equivalent footprint

Compliance Considerations:

RoHS Status: Preferred for new designs
Product Status: Active status preferred; Not For New Designs acceptable for legacy applications

Parts are grouped into three categories:

Group 1 - Parametric Equivalents (Identical Electrical & Mechanical): Parts matching all key electrical parameters and DO-214AC package with identical or superior specifications.

Group 2 - Manufacturer Recommended Substitutes (Electrical Equivalents with Package Compatibility): Parts from alternative manufacturers meeting electrical requirements in compatible packages.

Group 3 - Higher Voltage Alternatives (Electrical Superset): Parts with higher voltage ratings that maintain 1A current and fast recovery characteristics, suitable for applications with voltage margin requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Reverse Leakage @ Vr [µA]	Package	Temp Range [°C]	RoHS Status	Product Status
SS12/54	Vishay General Semiconductor	20	1	500	200 @ 20V	DO-214AC (SMA)	-65 ~ 125	Non-compliant	Active
SS12-E3/5AT	Vishay General Semiconductor	20	1	500	200 @ 20V	DO-214AC (SMA)	-65 ~ 125	ROHS3 Compliant	Active
SS12-E3/61T	Vishay General Semiconductor	20	1	500	200 @ 20V	DO-214AC (SMA)	-65 ~ 125	ROHS3 Compliant	Active
SS12	Taiwan Semiconductor Corporation	20	1	500	200 @ 20V	DO-214AC (SMA)	-55 ~ 125	ROHS3 Compliant	Active
B120-13-F	Diodes Incorporated	20	1	500	500 @ 20V	DO-214AC (SMA)	-65 ~ 150	ROHS3 Compliant	Active
SS12-LTP	Micro Commercial Co	20	1	500	500 @ 20V	DO-214AC (SMA)	-55 ~ 150	ROHS3 Compliant	Not For New Designs
STPS1L30A	STMicroelectronics	30	1	395	200 @ 30V	DO-214AC (SMA)	-55 ~ 150	ROHS3 Compliant	Active
STPS140A	STMicroelectronics	40	1	550	12 @ 40V	DO-214AC (SMA)	-55 ~ 150	ROHS3 Compliant	Active
STPS130U	STMicroelectronics	30	1	550	10 @ 30V	DO-214AA (SMB)	-55 ~ 150	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical & Mechanical Specifications):

SS12-E3/5AT and SS12-E3/61T from Vishay General Semiconductor are parametric equivalents to SS12/54 with identical electrical characteristics (20V, 1A, 500mV forward voltage, 200µA reverse leakage) and DO-214AC package compatibility. Both are ROHS3 compliant and Active status. SS12-E3/61T offers significantly higher inventory availability (71,923 pcs) compared to SS12-E3/5AT (5,800 pcs). These parts are recommended for applications requiring regulatory compliance upgrade from the non-compliant SS12/54.

SS12 from Taiwan Semiconductor Corporation provides parametric equivalence with ROHS3 compliance and Active status. Operating temperature range is -55°C to 125°C (versus -65°C to 125°C for SS12/54), which is acceptable for most applications. Inventory availability is substantial (65,300 pcs).

For Cross-Manufacturer Substitution (Electrical Equivalence with Enhanced Specifications):

B120-13-F from Diodes Incorporated matches the 20V, 1A electrical specification with identical forward voltage (500mV @ 1A) and DO-214AC package. Operating temperature range extends to 150°C (versus 125°C for SS12/54). Reverse leakage is higher at 500µA @ 20V compared to 200µA for SS12/54. ROHS3 compliant and Active status. High inventory (109,100 pcs).

SS12-LTP from Micro Commercial Co provides electrical equivalence but carries Not For New Designs status. This part is suitable only for legacy system maintenance or repair applications where design changes are not feasible.

For Higher Voltage Applications (Electrical Superset):

STPS1L30A from STMicroelectronics provides 30V reverse voltage rating with improved forward voltage (395mV @ 1A) and identical 1A current rating in DO-214AC package. Suitable for applications requiring voltage margin above 20V while maintaining current capacity. ROHS3 compliant and Active status.

STPS140A from STMicroelectronics provides 40V reverse voltage rating in DO-214AC package with 1A current capacity. Forward voltage is 550mV @ 1A. Suitable for applications with significant voltage margin requirements. ROHS3 compliant and Active status.

STPS130U from STMicroelectronics provides 30V reverse voltage rating with 1A current in SMB package (DO-214AA). This part requires PCB footprint modification and is not recommended as a direct replacement due to package incompatibility with DO-214AC.

Compliance & Product Status Considerations:

For new designs, select from parts with ROHS3 Compliant status and Active product status. SS12-E3/61T is recommended as primary choice due to parametric equivalence, ROHS3 compliance, Active status, and superior inventory availability. SS12 from Taiwan Semiconductor Corporation is secondary choice with equivalent specifications and high availability.

For legacy applications or where RoHS compliance is not required, SS12/54 remains viable. For applications requiring compliance upgrade, SS12-E3/5AT or SS12-E3/61T provide direct substitution.

Frequently Asked Questions (FAQ)

Q: Can SS12-E3/61T be used as a direct replacement for SS12/54?

A: Yes. SS12-E3/61T is a parametric equivalent with identical electrical specifications (20V, 1A, 500mV forward voltage, 200µA reverse leakage) and identical DO-214AC package. The primary difference is ROHS3 compliance status. No circuit modifications are required.

Q: What is the difference between SS12-E3/5AT and SS12-E3/61T?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The difference is packaging format: SS12-E3/5AT is supplied in Tape & Reel with 5,800 pcs inventory, while SS12-E3/61T is supplied in Tape & Reel with 71,923 pcs inventory. Selection depends on procurement volume requirements.

Q: Can STPS1L30A replace SS12/54 in all applications?

A: STPS1L30A has higher reverse voltage rating (30V versus 20V) and lower forward voltage (395mV versus 500mV @ 1A), making it suitable for applications where SS12/54 operates. However, the higher voltage rating is not necessary for 20V applications. STPS1L30A is appropriate only when voltage margin above 20V is required by circuit design.

Q: Why is STPS130U not recommended as a substitute?

A: STPS130U uses SMB package (DO-214AA) instead of SMA package (DO-214AC). This requires different PCB footprint and is not a direct replacement. Mechanical incompatibility prevents plug-and-play substitution.

Q: Is SS12-LTP suitable for new product designs?

A: No. SS12-LTP carries Not For New Designs product status. This part is restricted to legacy system maintenance and repair only. For new designs, select from parts with Active status such as SS12-E3/61T, SS12, or B120-13-F.

Q: What is the significance of reverse leakage current differences between substitutes?

A: Reverse leakage current affects power dissipation and circuit performance at elevated temperatures. SS12/54 and SS12-E3/61T specify 200µA @ 20V, while B120-13-F and SS12-LTP specify 500µA @ 20V. Higher leakage increases standby power consumption. For low-power applications, 200µA leakage is preferred. For general applications, 500µA leakage is acceptable.

Q: Can I use B120-13-F instead of SS12/54 without circuit modifications?

A: Yes. B120-13-F is electrically equivalent with identical 20V, 1A, 500mV specifications and DO-214AC package compatibility. Operating temperature range extends to 150°C. Reverse leakage is higher (500µA versus 200µA), which may increase standby power consumption in low-power applications but is acceptable for most rectification circuits.

Q: What is the operating temperature difference between SS12/54 and its substitutes?

A: SS12/54 operates from -65°C to 125°C. Most substitutes (SS12-E3/5AT, SS12-E3/61T, B120-13-F, STPS1L30A, STPS140A) extend to 150°C maximum junction temperature. SS12 from Taiwan Semiconductor operates to 125°C. For applications requiring -65°C minimum temperature, verify substitute specifications. For standard industrial applications (-40°C to 85°C), all substitutes are suitable.

Q: Is there a compliance advantage to selecting SS12-E3/61T over SS12/54?

A: Yes. SS12-E3/61T is ROHS3 compliant, while SS12/54 is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, SS12-E3/61T is mandatory. For legacy systems without compliance requirements, SS12/54 remains acceptable.

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