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SS14FL Schottky Diode Equivalent & Substitute Parts
Part Overview
The SS14FL is a 40V, 1A Schottky rectifier diode manufactured by onsemi in SOD-123F surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement. The SS14FL serves as a fast recovery rectifier suitable for automotive-grade applications with AEC-Q101 qualification. Active alternatives with matching or superior electrical characteristics are available from multiple manufacturers.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) Maximum | 40 | V |
| Current - Average Rectified (Io) | 1 | A |
| Voltage - Forward (Vf) Maximum @ If | 550 | mV @ 1 A |
| Reverse Recovery Time (trr) | 5.695 | ns |
| Current - Reverse Leakage @ Vr | 30 | µA @ 40 V |
| Technology | Schottky | — |
| Mounting Type | Surface Mount | — |
| Package / Case | SOD-123F | — |
| Operating Temperature - Junction | -55 to 125 | °C |
| Grade | Automotive | — |
| Qualification | AEC-Q101 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the SS14FL is determined by strict equivalence across the following critical parameters:
Primary Equivalence Criteria:
- Voltage - DC Reverse (Vr) Maximum: 40 V
- Current - Average Rectified (Io): 1 A
- Technology: Schottky
- Mounting Type: Surface Mount
- Package / Case: SOD-123F
Secondary Compatibility Factors:
- Voltage - Forward (Vf) Maximum @ If: 550 mV @ 1 A (or lower)
- Operating Temperature Range: -55°C to 125°C minimum
- RoHS Compliance: ROHS3 Compliant
- Reverse Recovery Time: Fast Recovery ≤ 500 ns
Parts are classified into three substitution categories:
Direct Manufacturer Equivalents: Parts from onsemi with identical electrical specifications and active product status (MBR140SFT1G, MBR140SFT3G, NRVB140SFT1G, NRVB140SFT3G).
Parametric Equivalents: Parts meeting all critical electrical parameters with matching package and thermal characteristics but from alternative manufacturers (1N5819W from EVVO Semi).
Similar Substitutes: Parts with matching voltage and current ratings but differing in secondary parameters such as forward voltage, reverse leakage current, or package variant (B240S1F-7, RB060MM-40TR, RB068MM-40TR, RB160MM-40TR, RB160MM-50TR).
Parameter Comparison
| Part Number | Manufacturer | Vr (Max) V | Io (A) | Vf (Max) mV @ If | Ir @ Vr µA | Vj (°C) | Package | Status | Grade |
|---|---|---|---|---|---|---|---|---|---|
| SS14FL | onsemi | 40 | 1 | 550 @ 1A | 30 @ 40V | -55 to 125 | SOD-123F | Obsolete | Automotive |
| MBR140SFT1G | onsemi | 40 | 1 | 550 @ 1A | 500 @ 40V | -55 to 125 | SOD-123F | Active | — |
| MBR140SFT3G | onsemi | 40 | 1 | 550 @ 1A | 500 @ 40V | -55 to 125 | SOD-123F | Active | — |
| NRVB140SFT1G | onsemi | 40 | 1 | 550 @ 1A | 500 @ 40V | -55 to 125 | SOD-123F | Active | Automotive |
| NRVB140SFT3G | onsemi | 40 | 1 | 550 @ 1A | 500 @ 40V | -55 to 125 | SOD-123F | Active | Automotive |
| 1N5819W | EVVO Semi | 40 | 1 | 600 @ 1A | 1000 @ 40V | -55 to 150 | SOD-123F | Active | — |
| B240S1F-7 | Diodes Incorporated | 40 | 2 | 500 @ 2A | 200 @ 40V | -55 to 150 | SOD-123F | Active | — |
| RB160MM-40TR | Rohm Semiconductor | 40 | 1 | 510 @ 1A | 30 @ 40V | — | SOD-123F | Active | — |
| RB160MM-50TR | Rohm Semiconductor | 40 | 1 | 510 @ 1A | 30 @ 40V | — | SOD-123F | Active | — |
| RB060MM-40TR | Rohm Semiconductor | 40 | 2 | 560 @ 2A | 500 @ 40V | — | SOD-123F | Active | — |
| RB068MM-40TR | Rohm Semiconductor | 40 | 2 | 725 @ 2A | 0.55 @ 40V | — | SOD-123F | Active | — |
Engineering Selection Recommendations
Direct Replacement (Preferred):
NRVB140SFT1G and NRVB140SFT3G are the primary recommended substitutes. Both parts are manufactured by onsemi with active product status, maintain automotive-grade classification with AEC-Q101 qualification, and provide identical electrical specifications to the SS14FL across voltage, current, and thermal operating ranges. The NRVB series represents the current automotive-qualified equivalent. Selection between SFT1G (Cut Tape & Digi-Reel) and SFT3G (Tape & Reel) depends on packaging and procurement requirements.
Alternative Direct Equivalents:
MBR140SFT1G and MBR140SFT3G from onsemi provide identical electrical performance and active status. These parts lack automotive-grade designation but maintain full electrical equivalence and AEC-Q101 compliance is not specified. These are suitable for non-automotive applications or where automotive qualification is not required.
Cross-Manufacturer Equivalent:
1N5819W from EVVO Semi meets the 40V, 1A core requirements with active product status and extended operating temperature range (-55°C to 150°C). Forward voltage is specified at 600 mV versus 550 mV for the SS14FL, and reverse leakage current is higher at 1 mA. This part is suitable where the extended temperature range provides design benefit and the higher leakage current is acceptable.
Higher Current Alternatives:
B240S1F-7 (Diodes Incorporated), RB060MM-40TR, and RB068MM-40TR provide 2A current rating with 40V voltage rating. These parts are suitable for applications requiring higher current capacity. Forward voltage characteristics vary: B240S1F-7 at 500 mV @ 2A provides superior performance; RB060MM-40TR at 560 mV @ 2A is comparable; RB068MM-40TR at 725 mV @ 2A exhibits higher forward voltage.
Rohm Semiconductor Alternatives:
RB160MM-40TR and RB160MM-50TR from Rohm Semiconductor provide 1A, 40V specifications with forward voltage of 510 mV @ 1A, matching the SS14FL electrical performance. Reverse leakage current is specified at 30 µA, identical to the original part. These parts use PMDU package variant but maintain SOD-123F case compatibility.
Frequently Asked Questions (FAQ)
Q: Can MBR140SFT1G directly replace SS14FL in automotive applications?
A: MBR140SFT1G provides identical electrical specifications and is manufactured by onsemi. However, it does not carry automotive-grade designation or AEC-Q101 qualification. For automotive applications requiring AEC-Q101 compliance, NRVB140SFT1G or NRVB140SFT3G are the specified replacements.
Q: What is the difference between MBR140SFT1G and MBR140SFT3G?
A: Both parts are electrically identical. The difference is packaging: SFT1G is supplied in Cut Tape (CT) & Digi-Reel format, while SFT3G is supplied in Tape & Reel (TR) format. Selection depends on procurement volume and assembly line requirements.
Q: Can B240S1F-7 be used as a direct replacement for SS14FL?
A: B240S1F-7 is a similar substitute with matching 40V voltage rating but provides 2A current capacity versus 1A for the SS14FL. It can be used in applications where the higher current rating does not create design conflicts. Forward voltage is 500 mV @ 2A, which is lower than the SS14FL specification. This part is suitable for designs where increased current capacity is beneficial or neutral.
Q: Why does 1N5819W have higher reverse leakage current than SS14FL?
A: 1N5819W specifies 1 mA reverse leakage current at 40V compared to 30 µA for SS14FL. This difference reflects manufacturing process variations between EVVO Semi and onsemi. The higher leakage current remains within acceptable limits for most rectifier applications but should be evaluated in designs sensitive to leakage current performance.
Q: Are Rohm Semiconductor RB160MM-40TR and RB160MM-50TR interchangeable?
A: RB160MM-40TR and RB160MM-50TR are electrically identical with matching 40V, 1A specifications and 510 mV forward voltage. The designation difference (40 versus 50) reflects packaging or tape configuration variants. Both parts are suitable for direct substitution of SS14FL.
Q: What is the significance of the PMDU package designation on Rohm parts?
A: PMDU is Rohm's package designation for surface mount diodes in the SOD-123F form factor. Parts specified with PMDU package maintain mechanical and electrical compatibility with standard SOD-123F packages. The PMDU designation indicates Rohm's internal package specification but does not affect substitution compatibility.
Q: Can higher current-rated parts like RB060MM-40TR be used in place of 1A-rated SS14FL?
A: Yes. Higher current-rated parts are suitable for applications designed for 1A operation. The 2A rating of RB060MM-40TR provides additional design margin. Forward voltage at 560 mV @ 2A is comparable to SS14FL specifications. This substitution is appropriate where increased current capacity does not create thermal or cost concerns.
Q: Is RoHS3 compliance maintained across all substitute parts?
A: All substitute parts listed are specified as ROHS3 Compliant. This compliance is maintained across onsemi, EVVO Semi, Diodes Incorporated, and Rohm Semiconductor alternatives, ensuring environmental and regulatory consistency with the original SS14FL specification.
Q: What is the impact of extended temperature range on 1N5819W?
A: 1N5819W specifies operating junction temperature range of -55°C to 150°C compared to -55°C to 125°C for SS14FL. The extended upper temperature limit provides design flexibility for applications operating at elevated ambient or junction temperatures. This extended range does not affect substitution compatibility for designs operating within the SS14FL temperature specification.
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