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SS12HM2G Equivalent & Substitute Parts
Part Overview
The SS12HM2G 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 production and design requirements. The part carries automotive-grade qualification (AEC-Q101) and ROHS3 compliance, making it suitable for automotive and industrial applications requiring fast recovery rectification.
Substiute Parts
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 SS12HM2G 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
- Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
- Technology: Schottky
- Package / Case: DO-214AC, SMA (or compatible surface mount package)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
Parametric Equivalents maintain identical electrical specifications and are direct replacements without design modification. These include SS12 (active status) and SS12 R3G (discontinued status).
Similar Parts share the same voltage and current ratings but may differ in reverse leakage current, capacitance, operating temperature range, or package variant (SMA vs. SMB). These parts are functionally compatible for the specified 20 V / 1 A application but require verification of secondary parameters for specific circuit requirements.
Higher Current Ratings (such as B220AQ-13-F at 2 A or SK32A-LTP at 3 A) are listed as similar parts due to identical voltage rating and package compatibility, though they exceed the 1 A current specification and are suitable only when higher current capacity is required or acceptable.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vr (Max) [V] | Io [A] | Vf (Max) @ If [mV] | Ir @ Vr [µA] | Package | Temp Range [°C] | Product Status | AEC-Q101 |
|---|---|---|---|---|---|---|---|---|---|
| SS12HM2G | Taiwan Semiconductor | 20 | 1 | 500 @ 1A | 200 @ 20V | DO-214AC (SMA) | -55 ~ 125 | Discontinued | Yes |
| SS12 | Taiwan Semiconductor | 20 | 1 | 500 @ 1A | 200 @ 20V | DO-214AC (SMA) | -55 ~ 125 | Active | — |
| SS12 R3G | Taiwan Semiconductor | 20 | 1 | 500 @ 1A | 200 @ 20V | DO-214AC (SMA) | -55 ~ 125 | Discontinued | — |
| B120-13-F | Diodes Incorporated | 20 | 1 | 500 @ 1A | 500 @ 20V | DO-214AC (SMA) | -65 ~ 150 | Active | — |
| B120B-13-F | Diodes Incorporated | 20 | 1 | 500 @ 1A | 500 @ 20V | DO-214AA (SMB) | -65 ~ 150 | Active | — |
| B120Q-13-F | Diodes Incorporated | 20 | 1 | 500 @ 1A | 500 @ 20V | DO-214AC (SMA) | -65 ~ 150 | Active | Yes |
| B220AQ-13-F | Diodes Incorporated | 20 | 2 | 500 @ 2A | 500 @ 20V | DO-214AC (SMA) | -65 ~ 150 | Active | Yes |
| CMSH1-20M BK PBFREE | Central Semiconductor | 20 | 1 | 500 @ 1A | 500 @ 20V | DO-214AC (SMA) | -65 ~ 150 | Active | — |
| CMSH1-20M TR13 PBFREE | Central Semiconductor | 20 | 1 | 500 @ 1A | 500 @ 20V | DO-214AC (SMA) | -65 ~ 150 | Active | — |
| SK32A-LTP | Micro Commercial Co | 20 | 3 | 500 @ 3A | 500 @ 20V | DO-214AC (SMA) | -50 ~ 125 | Not For New Designs | — |
| SS12-E3/5AT | Vishay General Semiconductor | 20 | 1 | 500 @ 1A | 200 @ 20V | DO-214AC (SMA) | -65 ~ 125 | Active | — |
Engineering Selection Recommendations
Primary Recommendation: SS12 (Taiwan Semiconductor)
The SS12 is the direct parametric equivalent to SS12HM2G, maintaining identical electrical specifications (20 V, 1 A, 500 mV forward voltage, 200 µA reverse leakage) and package configuration (DO-214AC SMA). The part is currently active in production with high inventory availability (65,300 pcs), ensuring supply continuity. Both parts share the same base product number (SS12) and are ROHS3 compliant with MSL 1 rating.
Secondary Recommendation for Automotive Applications: B120Q-13-F (Diodes Incorporated)
For applications requiring automotive-grade qualification (AEC-Q101), the B120Q-13-F provides equivalent 20 V / 1 A performance in DO-214AC SMA package with active product status. This part extends the operating temperature range to -65°C ~ 150°C and carries AEC-Q101 certification matching the original SS12HM2G specification. Reverse leakage current is specified at 500 µA (versus 200 µA for SS12HM2G), which remains within acceptable limits for most rectification applications.
Alternative for General Applications: CMSH1-20M TR13 PBFREE (Central Semiconductor)
The CMSH1-20M TR13 PBFREE offers 20 V / 1 A performance in DO-214AC SMA package with active status and high inventory (25,246 pcs). This part is suitable for applications where automotive qualification is not required. Operating temperature range extends to -65°C ~ 150°C.
Not Recommended for New Designs: SK32A-LTP (Micro Commercial Co)
Although the SK32A-LTP maintains 20 V voltage rating and DO-214AC SMA package, its product status is listed as "Not For New Designs." This designation indicates the manufacturer has discontinued active support for this part. Additionally, the 3 A current rating exceeds the 1 A specification of SS12HM2G, introducing unnecessary design complexity and cost.
Package Consideration: B120B-13-F (Diodes Incorporated)
The B120B-13-F is functionally equivalent but uses DO-214AA (SMB) package instead of DO-214AC (SMA). This part is suitable only if PCB layout accommodates the larger SMB footprint. Direct pin-for-pin substitution is not possible without board redesign.
Frequently Asked Questions (FAQ)
Q: Can SS12 directly replace SS12HM2G without circuit modification?
A: Yes. The SS12 is a parametric equivalent with identical voltage (20 V), current (1 A), forward voltage (500 mV @ 1 A), and package (DO-214AC SMA) specifications. No circuit modification is required. Both parts are ROHS3 compliant with MSL 1 rating.
Q: What is the difference between SS12HM2G and B120-13-F?
A: Both parts are rated for 20 V / 1 A in DO-214AC SMA package. The primary differences are: (1) Reverse leakage current: SS12HM2G specifies 200 µA @ 20 V, while B120-13-F specifies 500 µA @ 20 V; (2) Operating temperature range: SS12HM2G operates -55°C ~ 125°C, B120-13-F operates -65°C ~ 150°C; (3) Manufacturer: Taiwan Semiconductor vs. Diodes Incorporated. The B120-13-F is suitable for applications where extended temperature range is beneficial and higher reverse leakage is acceptable.
Q: Is B120Q-13-F suitable for automotive applications?
A: Yes. The B120Q-13-F carries AEC-Q101 automotive qualification, matching the original SS12HM2G specification. It maintains 20 V / 1 A performance in DO-214AC SMA package with active product status and extended operating temperature range (-65°C ~ 150°C).
Q: Why is B220AQ-13-F listed as a similar part if it has 2 A rating?
A: The B220AQ-13-F shares the same 20 V voltage rating, DO-214AC SMA package, and AEC-Q101 automotive qualification as SS12HM2G. The 2 A current rating is a superset of the 1 A requirement, making it functionally compatible for applications where higher current capacity is required or acceptable. It is not a direct replacement for 1 A-limited designs but serves as an alternative for designs that can accommodate higher current capability.
Q: What is the difference between CMSH1-20M BK PBFREE and CMSH1-20M TR13 PBFREE?
A: Both parts are manufactured by Central Semiconductor with identical electrical specifications (20 V, 1 A, 500 mV forward voltage). 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 TR13 variant is preferred for automated assembly processes.
Q: Can SK32A-LTP be used as a substitute?
A: The SK32A-LTP maintains 20 V voltage rating and DO-214AC SMA package compatibility. However, the part is designated "Not For New Designs" by the manufacturer, indicating discontinued active support. Additionally, the 3 A current rating exceeds the 1 A specification of SS12HM2G. This part should not be selected for new designs.
Q: Does B120B-13-F require PCB layout changes?
A: Yes. The B120B-13-F uses DO-214AA (SMB) package, which has a larger footprint than the DO-214AC (SMA) package of SS12HM2G. Direct pin-for-pin substitution is not possible. PCB layout modification is required to accommodate the SMB package dimensions.
Q: What is the significance of the -55°C lower temperature limit on SS12HM2G compared to -65°C on B120-13-F?
A: The SS12HM2G specifies a minimum operating temperature of -55°C, while B120-13-F specifies -65°C. For applications operating below -55°C, the B120-13-F provides extended low-temperature performance. For applications within the -55°C ~ 125°C range, both parts are functionally equivalent.
Q: Are all listed parts ROHS3 compliant?
A: Yes. All parts listed in the parameter comparison table carry ROHS3 compliance status, meeting environmental and hazardous substance restrictions for electronic components.
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