Is there a pin-compatible replacement for SS18?

SS28 is a potential pin-compatible replacement as it shares the same SMA package and pinout. However, its forward voltage may differ slightly, so verification is recommended before drop-in replacement.

What risks should I check before replacing SS18?

Key risks include functional type and forward voltage (Vf). Ensure the replacement is also a Schottky diode to maintain high efficiency. A different Vf can impact power loss and heat dissipation. Also, verify the replacement's ratings meet or exceed your circuit's needs.

SS18 Alternatives, Datasheet & Cross Reference | MDD(Microdiode Semiconductor)

SS18 is a popular 1A, 80V Schottky diode in an SMA package, used in power supplies and freewheeling applications. Finding a suitable replacement involves matching the Schottky characteristics, package, and electrical ratings.

AI replacement insight

Electrical risklow

Candidates are also Schottky diodes. Minor differences in forward voltage (Vf) should be checked.

Package risklow

All parts use the standard DO-214AC (SMA) package, ensuring physical compatibility.

Can it be replaced directly?

While no part is a guaranteed drop-in, SS28 is a very strong candidate. It is a Schottky diode in the same SMA package with the same voltage and higher current rating. A datasheet review of the forward voltage (Vf) is the main required check.

Best replacement path

SS28 offers the most direct replacement path with a minor upgrade in current, making it a robust choice.

Main risk

The primary risk is substituting with a non-Schottky diode (e.g., fast recovery), which would increase power loss due to higher forward voltage.

Recommended alternatives

A Schottky diode in the same package with identical voltage and higher current rating (2A), making it a robust alternative.

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Alternative comparison matrix

Feature / factor	SS18	SS28	SS5200	Compatibility / risk
Package	DO-214AC/SMA	DO-214AC/SMA	SMA (DO-214AC)	DO-214AC/SMA / SMA (DO-214AC) — Package is physically compatible.; SS5200: Package is physically compatible.
Diode Type	Schottky	Schottky	Schottky	Schottky — Both are Schottky diodes, ensuring similar low Vf and fast switching.; SS5200: Both are Schottky diodes.
Voltage	80V	80V	200V	80V / 200V — Voltage rating is identical.; SS5200: Significantly higher voltage rating offers more robustness.
Current	1A	2A	5A	2A / 5A — Higher current rating provides more design margin.; SS5200: Significantly higher current rating offers more robustness.
Forward Voltage	~0.70V @ 1A	~0.85V @ 2A	~0.85V @ 5A	~0.85V @ 2A / ~0.85V @ 5A — Vf may be slightly higher; review datasheet for specific operating point.; SS5200: Vf may be higher; review datasheet for specific operating point.

Application & sourcing insights

Questions & answers

SS28 is a strong alternative, offering the same package and voltage with a higher 2A current rating. SS5200 is a more robust upgrade with 200V and 5A ratings. Both are Schottky diodes and require checking the forward voltage for your specific circuit.