MDD SS14F
Full Technical Specifications
12 Parameters| Parameter / Attribute | Specification / Value |
|---|---|
| Series | SMAF |
| Mounting | Surface Mount |
| Voltage - DC reverse (Vr) | 40 V |
| Voltage - forward (Vf) (Max) @ if | 550 mV @ 1 A |
| Current - reverse leakage @ vr | 500 µA @ 40 V |
| Current - average rectified | 1A |
| Operating temperature - junction | -55°C ~ 125°C |
| Speed | Fast Recovery =< 500ns, > 200mA (Io) |
| Package | Tape & Reel (TR) |
| Technology | Schottky |
| Case | DO-221AC, SMA Flat Leads |
| Capacitance @ vr, | 110pF @ 4V, 1MHz |
Need Stock or a Drop-in Second-Source for SS14F?
Package: DO-41 axial · Pin-compatible replacements with immediate Shenzhen spot stock
The 1N5817/18/19 trio is the default low-voltage Schottky of repair benches and small-batch production. The 20V rating of the 1N5817 is the number to watch: it is often picked as "the cheapest Schottky" and then runs with almost no margin on a 12V rail with transients. Spot supply of the family is deep; the practical question is which voltage grade and which package to hold, and what the higher grades cost in forward drop.
Verified Pin-Compatible Replacements (4 verified alternatives)
Factory-Reel Stock, Double the Reverse Margin
Shenzhen Spot Stock (24-48h Dispatch)
Same 1A Schottky family at twice the reverse rating: VRRM 40V versus 20V. Forward drop rises with the grade: 0.60V max at 1A versus 0.45V on the 1N5817.
VRRM 40V; IO 1.0A; IFSM 25-30A; TJ -65 to +125 degC class.
SMD Form of the Same 40V / 1A Schottky
Shenzhen Spot Stock (24-48h Dispatch)
SMA Schottky: 40V VRRM, 1A, VF 0.55V max at 1A - the surface-mount successor to the 1N5819. The lower grades SS12 (20V) and SS13 (30V) track 1N5817 and 1N5818.
VRRM 40V; IO 1.0A; IFSM 30A; TJ -55 to +150 degC.
Compact SMD for Dense Boards
Shenzhen Spot Stock (24-48h Dispatch)
40V / 1A Schottky in SOD-123: the small-footprint member of the same family, VF 0.60V max at 1A class.
VRRM 40V; IO 1.0A; TJ -65 to +150 degC.
Three Times the Current, Same Family
Shenzhen Spot Stock (24-48h Dispatch)
The current upgrade: 3.0A IO at 40V VRRM, IFSM 80A class - for when the 1A family runs at its thermal limit.
VRRM 40V; IO 3.0A; VF 0.525V max at 3A.
Buyer & Quality Checklist for Sourcing Alternatives
- Check reverse leakage before using this family in battery paths: 1N581x parts leak in the mA class at rated voltage, and the leakage roughly doubles per 10 degC rise. For battery-standby rails choose a low-leakage Schottky instead of the cheapest 1N581x.
- The 20V rating of the 1N5817 is marginal on 12V rails with transients; the 1N5819 or SS14 (40V) is the safer default for anything derived from 12V.
- Upgrading the voltage grade is always safe: 1N5817 to 1N5819 raises reverse margin and costs only 0.15V of forward drop at 1A.
- Keep the package consistent with the assembly method: DO-41 for through-hole repair, SMA (SS14) or SOD-123 (1N5819HW / 1N5819W) for SMD. Do not confuse SOD-123 and the thinner SOD-123FL - the land patterns differ.
- Schottky reverse recovery is intrinsically fast (no minority-carrier tail), so this family is also the standard low-loss upgrade over PN diodes in switching positions - check VF and leakage budgets rather than speed.
Frequently Asked Technical Questions
Q: What is the difference between 1N5817, 1N5818 and 1N5819?
A: Only the reverse voltage: 20V, 30V, 40V respectively, at the same 1A current and the same DO-41 body. Forward drop rises slightly with the grade - about 0.45V, 0.55V and 0.60V maximum at 1A. Moving to a higher grade is always electrically safe.
Q: What is the SMD equivalent of 1N5819?
A: SS14 (SMA, 40V / 1A), 1N5819HW or 1N5819W (SOD-123). SS16 raises the margin to 60V if the rail is noisy.
Q: Can I use a 1N5819 for a 1N5817?
A: Yes - same current, same package, higher reverse rating. The forward drop increases marginally (0.6V versus 0.45V maximum at 1A), which is irrelevant in most rectification and reverse-polarity protection circuits.