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1N4007 & 1N5408 cross reference — the stocked 3 A series

Stocked series1N5400–1N5408

PackageDO-27

Current class3 A

Voltage range50–1000 V across the series

Two lookups land on this page. The 1N4007 is the 1,000 V member of the 1 A 1N400x rectifier family — the default mains-input rectifier in countless designs. The 1N5408 is the corresponding high-voltage member of the 3 A 1N540x family. Haiben stocks the full 1N5400–1N5408 series in DO-27 (published range: 3 A, 50 V to 1000 V), and this cross reference explains how the two families relate, when the stocked 3 A part is the right answer to a 1N4007 requirement, and when it is not.

A cross reference is engineering guidance, not a claim of identity: the families differ in current rating and package, so the substitution checklist below — voltage grade, current, footprint — is the substance of the page. The original 1 A part remains available through our sourcing service where a design cannot change.

The substitution checklist

Voltage first: match the grade, not just the family. A 1N4007 requirement is a 1,000 V requirement; within the stocked series that points to the top grade (1N5408, the 1,000 V end of the published 50–1000 V range). Lower grades in the series exist for lower-voltage rails and should never be substituted upward in voltage stress. Current second: the 1N540x family is a 3 A class against the 1 A class of the 1N400x family, so electrically the stocked part brings headroom — surge and thermal behaviour still follow the datasheet of the actual part fitted.

Footprint third, and this is where the families genuinely differ: the 1 A family is a DO-41 axial part, the 3 A family is the larger DO-27 axial. Lead diameter and body size are not the same, so the 3 A part is not a mechanical drop-in on pads drilled for DO-41. In a new layout, or a through-hole design with room, the change is simple; on a fixed board it may not be. If the board cannot change, ask us to source the original 1N4007 rather than forcing the cross.

When the 3 A series is the right answer

Designs that run a 1 A rectifier close to its limit — warm enclosures, high surge at switch-on, capacitive-input filters — are the classic case for stepping to the 3 A family at the same voltage grade, and they are why we stock the whole 1N5400–1N5408 range rather than a single grade. The same applies to new designs that start from a 1N4007 reference schematic but have layout freedom: specifying the DO-27 part from the beginning buys thermal margin at a commodity price point.

Conversely, cost-optimised high-volume boards laid out for DO-41, and any design under strict change control, should stay with the original part — which the sourcing team can quote alongside, so both routes are priced in one enquiry.

What we stock — the 1N5400–1N5408 rectifier series

Series	Package	Published data
1N5400 through 1N5408	DO-27	3 A rectifier diodes; voltage grades spanning 50 V to 1000 V across the nine-part series

Parameters are quoted from the manufacturer's published product pages. Confirm the full datasheet specification before design-in; ratings are confirmed at quotation.

Questions & answers

Can a 1N5408 replace a 1N4007 directly?

Electrically it matches the 1,000 V grade with a higher 3 A current class, but the package changes from DO-41 to the larger DO-27, so it is a layout change, not a drop-in. Confirm footprint and lead diameter against your board before switching.

Do you stock the 1N4007 itself?

Our published stocked series is the 3 A 1N5400–1N5408 family. The 1 A 1N4007 can be quoted through our sourcing service; send the quantity and any manufacturer constraints.

Which grade should I pick for a 230 V mains input?

Work from the voltage grade and derating your design standard requires — buyers typically specify from the upper part of the series for mains inputs. Send the requirement and we quote the matching grade with its datasheet.