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Equivalent & Substitute Parts for S1AF
Part Overview
The Diodes Incorporated S1AF is a general-purpose diode designed for rectification in surface mount applications. With a maximum DC reverse voltage of 50 V and an average rectified current rating of 1A, the S1AF offers standard recovery characteristics and is housed in a DO-214AC (SMA) package. The part is classified as Obsolete, creating a requirement to identify suitable substitute diodes with matching electrical and mechanical specifications for ongoing or new designs.
Substiute Parts
Key Parameters
| Parameter | S1AF Specification |
|---|---|
| Manufacturer | Diodes Incorporated |
| Category | Diodes, Rectifiers |
| Voltage - DC Reverse (Vr) (Max) | 50 V |
| Current - Average Rectified (Io) | 1A |
| Voltage - Forward (Vf) (Max) @ If | 1.1 V @ 1 A |
| Speed | Standard Recovery >500ns, > 200mA (Io) |
| Reverse Recovery Time (trr) | 3 µs |
| Current - Reverse Leakage @ Vr | 5 µA @ 50 V |
| Capacitance @ Vr, F | 10pF @ 4V, 1MHz |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AC, SMA |
| Supplier Device Package | SMA |
| Operating Temperature - Junction | -65°C ~ 150°C |
| RoHS Status | ROHS3 Compliant |
| REACH Status | REACH Unaffected |
| ECCN | EAR99 |
| HTSUS | 8541.10.0080 |
Substitute Part Grouping Explanation
Substitute parts for S1AF are selected by matching the following parameters: diode category (rectifier), mounting type (surface mount), package/case (DO-214AC, SMA), average forward current rating (1A), and key electrical ratings including forward voltage and reverse leakage characteristics. Compliance standards such as ROHS3 status and REACH status are also matched. Only substitute parts meeting these exact criteria are considered equivalent for component replacement.
Key parameters for substitution:
- Diode Category
- Voltage - DC Reverse (Vr) (Max)
- Current - Average Rectified (Io)
- Voltage - Forward (Vf) (Max) @ If
- Speed/Recovery Time
- Reverse Leakage Current
- Capacitance
- Mounting Type
- Package / Case
- Supplier Device Package
- Operating Temperature - Junction
- RoHS and REACH status
Parameter Comparison
| Parameter | S1AF | S1M_HF |
|---|---|---|
| Manufacturer | Diodes Incorporated | Diodes Incorporated |
| Category | Diodes, Rectifiers | Diodes, Rectifiers |
| Voltage - DC Reverse (Vr) (Max) | 50 V | 1000 V |
| Current - Average Rectified (Io) | 1A | 1A |
| Voltage - Forward (Vf) (Max) @ If | 1.1 V @ 1 A | 1.1 V @ 1 A |
| Speed | Standard Recovery >500ns, > 200mA (Io) | Standard Recovery >500ns, > 200mA (Io) |
| Reverse Recovery Time (trr) | 3 µs | 1.3 µs |
| Current - Reverse Leakage @ Vr | 5 µA @ 50 V | 5 µA @ 1000 V |
| Capacitance @ Vr, F | 10pF @ 4V, 1MHz | 10pF @ 4V, 1MHz |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | DO-214AC, SMA | DO-214AC, SMA |
| Supplier Device Package | SMA | SMA |
| Operating Temperature - Junction | -65°C ~ 150°C | -55°C ~ 150°C |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected |
| ECCN | EAR99 | EAR99 |
| HTSUS | 8541.10.0080 | 8541.10.0080 |
Engineering Selection Recommendations
The S1AF has an obsolete product status. Direct substitution with active, compliant, and unaffected alternatives such as the S1M_HF is appropriate based on identical or compatible RoHS and REACH status, ECCN, and HTSUS codes provided. Only parts matching environmental and regulatory certifications, along with inventory status, should be selected for continuity in production and compliance.
Frequently Asked Questions (FAQ)
Q1: What criteria are used to select a substitute for S1AF?
A1: Substitutes are selected by matching diode category, current and voltage ratings, recovery characteristics, package/case, mounting type, electrical parameters, and regulatory compliance statuses.
Q2: Is package compatibility ensured between S1AF and its substitutes?
A2: Yes. Both S1AF and S1M_HF use the DO-214AC (SMA) surface mount package with identical supplier device package codes.
Q3: Are there differences in operating temperature between the parts?
A3: S1AF operates from -65°C to 150°C; S1M_HF operates from -55°C to 150°C.
Q4: How do RoHS and REACH compliance compare between S1AF and S1M_HF?
A4: Both parts are ROHS3 Compliant and REACH Unaffected.
Q5: Can S1M_HF be used in applications originally specified for S1AF?
A5: S1M_HF matches the critical electrical, mechanical, and compliance parameters listed for S1AF.
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