SS12-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS12-TP is a 20V, 1A Schottky rectifier diode manufactured by Micro Commercial Co in a DO-214AC (SMA) surface mount package. This component is classified as obsolete, indicating it is no longer in active production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing manufacturing requirements for applications utilizing this diode specification.

Substiute Parts

SS12-TP

Micro Commercial CoIn Stock: 1048SS12-TP Datasheet

Current PartRFQ

SS12-LTP

Micro Commercial CoIn Stock: 10174SS12-LTP Datasheet

DirectRFQ

B120-13-F

Diodes IncorporatedIn Stock: 109117B120-13-F Datasheet

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B120-E3/5AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 7823B120-E3/5AT Datasheet

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B120-E3/61T

Vishay General Semiconductor - Diodes DivisionIn Stock: 25394B120-E3/61T Datasheet

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MBRA120ET3G

onsemiIn Stock: 16646MBRA120ET3G Datasheet

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PMEG2010ER,115

Nexperia USA Inc.In Stock: 2302PMEG2010ER,115 Datasheet

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SS12

Taiwan Semiconductor CorporationIn Stock: 65317SS12 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS12-TP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 20 V
• Current - Average Rectified (Io): 1 A
• Technology: Schottky
• Mounting Type: Surface Mount
• Package / Case: DO-214AC (SMA) or compatible surface mount package

Allowable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Substitute parts may exhibit forward voltage between 340 mV and 530 mV at 1 A, provided the application circuit tolerates this range
• Current - Reverse Leakage @ Vr: Substitute parts may range from 1 µA to 500 µA at 20 V
• Operating Temperature - Junction: Substitute parts may extend the upper temperature limit to 150°C, providing enhanced thermal performance
• Capacitance @ Vr, F: Variation permitted where specified

Substitute parts are grouped into two categories: direct functional equivalents in DO-214AC (SMA) packaging, and alternative package options (SOD-123W) that maintain electrical specifications but require PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (DO-214AC/SMA Package - Direct PCB Compatibility):

1. B120-13-F (Diodes Incorporated) — Active product status with extended operating temperature range (-65°C to 150°C). Electrical parameters match SS12-TP within acceptable tolerances. Highest inventory availability (109,100 pcs). Recommended for new designs and production continuity.

2. SS12 (Taiwan Semiconductor Corporation) — Active product status, same base series as SS12-TP. Electrical parameters equivalent. Substantial inventory (65,300 pcs). Suitable for direct replacement in existing designs.

3. B120-E3/61T (Vishay General Semiconductor - Diodes Division) — Active product status with extended lower temperature rating (-65°C). Cut Tape packaging. Adequate inventory (25,300 pcs). Forward voltage specification (520 mV) requires circuit verification for applications with tight voltage budgets.

4. MBRA120ET3G (onsemi) — Active product status with extended operating temperature range (-55°C to 150°C). Superior reverse leakage characteristics (10 µA). Suitable for low-leakage applications. Inventory available (16,601 pcs).

5. B120-E3/5AT (Vishay General Semiconductor - Diodes Division) — Active product status. Tape & Reel packaging. Lower reverse leakage (200 µA). Inventory available (7,762 pcs).

Secondary Substitute (Alternative Package - SOD-123W):

6. PMEG2010ER,115 (Nexperia USA Inc.) — Active product status. SOD-123W package requires PCB layout modification. Superior forward voltage performance (340 mV). Limited inventory (2,200 pcs). Suitable only when package footprint change is acceptable.

Not Recommended for New Designs:

• SS12-LTP (Micro Commercial Co) — Product status "Not For New Designs" indicates manufacturer discontinuation trajectory. Use only for legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SS12-TP with any of the listed substitutes?

A: Direct replacement is possible for all parts listed in the DO-214AC (SMA) package category (B120-13-F, B120-E3/5AT, B120-E3/61T, MBRA120ET3G, SS12, SS12-LTP). These maintain identical footprint and pinout. The PMEG2010ER,115 requires PCB layout modification due to SOD-123W package differences.

Q: What is the significance of forward voltage (Vf) variation among substitutes?

A: Forward voltage ranges from 340 mV (PMEG2010ER,115) to 530 mV (MBRA120ET3G) across the substitute list. Applications with voltage-sensitive circuits or tight power budgets must verify that the selected substitute's Vf specification does not exceed circuit design margins. The original SS12-TP specifies 450 mV; substitutes with higher Vf (500-530 mV) may increase power dissipation.

Q: Why do some substitutes have lower reverse leakage current?

A: Reverse leakage current (Ir) varies from 1 µA (PMEG2010ER,115) to 500 µA (SS12-TP, SS12-LTP). Lower leakage indicates superior junction quality and reduced standby current. Applications requiring minimal leakage current should prioritize MBRA120ET3G (10 µA) or B120-E3/5AT/B120-E3/61T (200 µA).

Q: What is the impact of operating temperature range differences?

A: The original SS12-TP operates from -55°C to 125°C. Several substitutes extend the upper limit to 150°C (SS12-LTP, B120-13-F, MBRA120ET3G), providing thermal margin for high-temperature environments. B120-E3/5AT and B120-E3/61T extend the lower limit to -65°C for cold-temperature applications. Verify application requirements before selecting based on temperature range alone.

Q: Is SS12-LTP a suitable replacement despite "Not For New Designs" status?

A: SS12-LTP is electrically equivalent and maintains the same package. However, "Not For New Designs" status indicates the manufacturer is phasing out this part. Use SS12-LTP only for legacy system maintenance or repair. For new production, select B120-13-F, SS12, or MBRA120ET3G.

Q: What packaging options are available?

A: All primary substitutes use DO-214AC (SMA) surface mount package, identical to SS12-TP. Packaging variants include Cut Tape (CT), Tape & Reel (TR), and Digi-Reel options, which affect supply format but not electrical or mechanical compatibility. PMEG2010ER,115 uses SOD-123W package and requires PCB redesign.

Q: Which substitute offers the best overall compatibility?

A: B120-13-F (Diodes Incorporated) provides optimal compatibility: active product status, extended temperature range, electrical parameters within acceptable tolerance, and highest inventory availability. This part is recommended as the primary replacement for SS12-TP in both new designs and production continuity scenarios.