SS12L Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS12L 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 Sub SMA surface mount package. The device is classified as "Not For New Designs," indicating it has reached end-of-life status. This classification necessitates identification of equivalent and substitute components for ongoing production support and design continuity.

The SS12L operates across a junction temperature range of -55°C to 125°C with fast recovery characteristics (≤500 ns for currents >200 mA). It exhibits a maximum forward voltage of 450 mV at 1 A and reverse leakage current of 400 µA at 20 V. The component is RoHS3 compliant with MSL 1 (unlimited moisture sensitivity level).

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 1 A	mV
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	ns
Current - Reverse Leakage @ Vr	400	µA @ 20 V
Operating Temperature - Junction	-55 to 125	°C
Package / Case	DO-219AB	—
Mounting Type	Surface Mount	—
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
MSL	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS12L is determined by strict adherence to the following electrical and mechanical parameters:

Parametric Equivalents (Direct Substitutes): Parts that maintain identical electrical specifications across all critical parameters—20 V reverse voltage rating, 1 A average rectified current, 450 mV forward voltage at 1 A, fast recovery speed (≤500 ns), 400 µA reverse leakage at 20 V, and DO-219AB Sub SMA package—are classified as parametric equivalents. These components are interchangeable without circuit modification.

Manufacturer Recommended Substitute: The SS14LW represents an upgraded substitute with enhanced voltage rating (40 V) and improved reverse leakage characteristics (100 µA @ 40 V). This part operates in the same SOD-123W surface mount package family and maintains identical current rating (1 A), forward voltage (550 mV @ 1 A), and recovery speed characteristics. The SS14LW is suitable for applications where higher voltage margin is acceptable and package footprint compatibility exists.

Substitution Criteria:

Reverse voltage rating equal to or greater than 20 V
Average rectified current equal to or greater than 1 A
Forward voltage not exceeding 550 mV @ 1 A
Fast recovery speed (≤500 ns, >200 mA)
Surface mount technology
RoHS3 compliance
Operating temperature range -55°C to 125°C

Parameter Comparison

Parameter	SS12L	SS12L M2G	SS12L MHG	SS12L MQG	SS12L MTG	SS12L RFG	SS12L RHG	SS12L RQG	SS12L RTG	SS12L RUG	SS14LW
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V	20 V	20 V	20 V	20 V	20 V	20 V	40 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 1 A	450 mV @ 1 A	450 mV @ 1 A	450 mV @ 1 A	450 mV @ 1 A	450 mV @ 1 A	450 mV @ 1 A	450 mV @ 1 A	450 mV @ 1 A	450 mV @ 1 A	550 mV @ 1 A
Speed	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA	Fast Recovery ≤500 ns, >200 mA
Current - Reverse Leakage @ Vr	400 µA @ 20 V	400 µA @ 20 V	400 µA @ 20 V	400 µA @ 20 V	400 µA @ 20 V	400 µA @ 20 V	400 µA @ 20 V	400 µA @ 20 V	400 µA @ 20 V	400 µA @ 20 V	100 µA @ 40 V
Operating Temperature - Junction	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 125°C
Package / Case	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	SOD-123W
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalent Selection: For direct replacement of the SS12L in existing production, the parametric equivalent variants (SS12L M2G, SS12L MHG, SS12L MQG, SS12L MTG, SS12L RFG, SS12L RHG, SS12L RQG, SS12L RTG, and SS12L RUG) are the primary selection. All variants maintain identical electrical specifications and DO-219AB Sub SMA packaging. These parts are manufactured by Taiwan Semiconductor Corporation with Active product status, ensuring long-term availability and supply chain continuity. All variants carry ROHS3 compliance and MSL 1 rating, matching the original SS12L specifications.

Manufacturer Recommended Upgrade: The SS14LW is designated as the manufacturer-recommended substitute for new design initiatives or applications requiring enhanced performance margins. This part provides doubled reverse voltage rating (40 V versus 20 V) and superior reverse leakage characteristics (100 µA @ 40 V versus 400 µA @ 20 V). The SS14LW operates in the SOD-123W package, which differs from the Sub SMA footprint of the SS12L. Circuit board layout modification is required for SS14LW implementation. The SS14LW maintains identical current rating (1 A), forward voltage specification (550 mV @ 1 A maximum), and recovery speed characteristics. Active product status and ROHS3 compliance ensure long-term design support.

Compliance and Certification: All substitute parts listed maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification. MSL 1 rating (unlimited moisture sensitivity) applies uniformly across all variants, eliminating moisture-related handling constraints.

Frequently Asked Questions (FAQ)

Q: Can SS12L M2G, SS12L MHG, SS12L MQG, SS12L MTG, SS12L RFG, SS12L RHG, SS12L RQG, SS12L RTG, and SS12L RUG be used interchangeably with the original SS12L?

A: Yes. These nine variants are parametric equivalents with identical electrical specifications (20 V reverse voltage, 1 A current rating, 450 mV forward voltage at 1 A, fast recovery speed ≤500 ns, 400 µA reverse leakage at 20 V) and identical DO-219AB Sub SMA packaging. No circuit modification or board redesign is required. All variants are Active status products from Taiwan Semiconductor Corporation.

Q: What is the difference between the SS12L and SS14LW?

A: The SS14LW provides enhanced voltage rating (40 V versus 20 V) and improved reverse leakage performance (100 µA @ 40 V versus 400 µA @ 20 V). Both maintain 1 A current rating and fast recovery characteristics. The SS14LW forward voltage is specified at 550 mV @ 1 A (versus 450 mV for SS12L). The SS14LW uses SOD-123W packaging instead of Sub SMA, requiring board layout modification. The SS14LW is suitable for applications where higher voltage margin is beneficial.

Q: Why is the SS12L classified as "Not For New Designs"?

A: This classification indicates the SS12L has reached end-of-life status. Taiwan Semiconductor Corporation continues to support existing production with parametric equivalent variants (SS12L M2G through SS12L RUG) that maintain identical specifications. For new design initiatives, the SS14LW is the manufacturer-recommended alternative.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SS12L M2G, SS12L MHG, SS12L MQG, SS12L MTG, SS12L RFG, SS12L RHG, SS12L RQG, SS12L RTG, SS12L RUG, and SS14LW) are ROHS3 compliant with MSL 1 rating and REACH unaffected status.

Q: What packaging considerations apply when selecting between SS12L variants and SS14LW?

A: The nine parametric equivalent variants (SS12L M2G through SS12L RUG) use DO-219AB Sub SMA packaging, identical to the original SS12L. Direct board substitution is possible without layout modification. The SS14LW uses SOD-123W packaging, which has different footprint dimensions. PCB layout redesign is required for SS14LW implementation.

Q: Which substitute part should be selected for production continuity?

A: For immediate production continuity with zero circuit modification, select any of the nine parametric equivalent variants: SS12L M2G, SS12L MHG, SS12L MQG, SS12L MTG, SS12L RFG, SS12L RHG, SS12L RQG, SS12L RTG, or SS12L RUG. All maintain identical electrical performance and packaging. For new design initiatives, the SS14LW is the manufacturer-recommended option.

Q: Do the parametric equivalent variants differ in any electrical specification?

A: No. All nine parametric equivalent variants (SS12L M2G, SS12L MHG, SS12L MQG, SS12L MTG, SS12L RFG, SS12L RHG, SS12L RQG, SS12L RTG, and SS12L RUG) maintain identical electrical specifications: 20 V reverse voltage, 1 A current rating, 450 mV forward voltage at 1 A, fast recovery speed ≤500 ns, and 400 µA reverse leakage at 20 V. Differences exist only in manufacturing date codes and packaging format (some variants specify Tape & Reel packaging).

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across a junction temperature range of -55°C to 125°C, matching the original SS12L specification.

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