1N4004 Rectifier Diodes and M4 SMD Options
1N4004 is a general-purpose silicon rectifier diode in the 1N400x series, commonly specified for 1 A average forward current and 400 V repetitive peak reverse voltage under documented test conditions. Here you can find selectable axial DO-41 1N4004 parts and M4-labelled SMA surface-mount options, alongside mixed model listings and diode assortments. A shared product heading that mentions 1N4004 does not mean every selectable option is a 1N4004.
Which parts are actually offered?
- Axial 1N4004: DO-41 through-hole options appear in single-model packs and 1N4001–1N4007 family menus. The listed family grades differ in repetitive reverse voltage: typically 1N4001 50 V, 1N4002 100 V, 1N4003 200 V, 1N4004 400 V, 1N4005 600 V, 1N4006 800 V and 1N4007 1000 V. A family listing headed “1000 V” does not make its 1N4004 option 1000 V. One imported 1N4007 option claims 1200 V, conflicting with the usual family grade; obtain exact device documentation instead of transferring that claim to any variant.
- M4 SMD rectifiers: SMA/DO-214AC M1/M2/M4/M7 listings include M4 or “1N4004 SMA” selectors. A 1N4004 DO-41 leaded diode and an M4 SMA device require different PCB footprints and separate electrical/thermal verification; do not infer drop-in equivalence from the seller's shorthand.
- Other silicon rectifiers: Shared menus also offer 1N5404/1N5406/1N5408, 6A10, 10A10, 20A20, RL207 and S10M. Their current grades, body dimensions, surge ratings and cooling conditions differ from a 1N4004. Select the exact part before using any listing-wide current or voltage headline.
- Fast-recovery and Schottky alternatives: UF4004/UF4005/UF4007, FR107/FR207, HER options and 1N4937 have their own recovery characteristics. SS14/SS34 and 1N5817/1N5819/1N5822 are Schottky selections, while 1N4148/1N914 are signal-switching parts. None should be described as a 1N4004 simply because they share a kit or variant menu.
- Assorted kits: Some SMD kits contain M4 with M1/M7 and SS/US/RS choices; other boxed sets combine axial rectifiers and different diode technologies. A multi-option listing also offers Zener and TVS packs or DB3 trigger-diode options rather than a 1N4004. Check the actual selected contents and quantity.
How to choose for a circuit
- Confirm the chosen variant says 1N4004 or a documented M4 device, not merely that the product title contains the string. “Color” often identifies part number, package or pack count rather than color.
- Check repetitive peak reverse voltage with allowance for circuit transients. The commonly quoted 400 V grade is a reverse blocking limit under datasheet conditions, not a claim about forward drop, supply voltage, safety isolation or every listing in the collection.
- Evaluate average rectified forward current for the real waveform and ambient conditions, nonrepetitive surge rating, forward voltage, leakage and junction temperature. Confirm the part's heat path and installation rather than assuming 1 A applies under all conditions.
- Match axial DO-41 lead spacing and banded cathode or the correct SMA land pattern and polarity mark. For fast-switching circuits assess reverse recovery and loss; choose a suitable documented fast or Schottky alternative if required, not by a generic “fast switching” kit headline.
- Verify exact pack contents and body markings when buying a mixed kit, especially if preparing a bill of materials or replacement order.
Purchasing checklist
Record the exact manufacturer's part number and datasheet where available, device type, required reverse voltage, current and surge waveform, recovery needs, package/footprint, polarity, thermal design, quantity and kit composition. Generic “original,” “Schottky” and compatibility claims on imported mixed listings do not establish authenticity, certification or equivalence.
Frequently asked questions
Is 1N4004 a 1000 V diode?
No. The 1N4004 grade is commonly specified at 400 V repetitive peak reverse voltage. 1N4007 is a different selection in the same family, commonly specified at 1000 V; verify the chosen model's documentation.
Is M4 the same physical part as a DO-41 1N4004?
No. M4 is offered here in SMA surface-mount form, while the DO-41 1N4004 is axial leaded. Compare manufacturer ratings, markings, footprint, polarity and thermal conditions.
Are UF4004 and SS14 variants simply faster 1N4004s?
No. UF4004 is a separate ultrafast rectifier selection; SS14 is a Schottky part with different voltage and leakage behavior. Use their own datasheets and circuit requirements.
Does selecting a boxed kit guarantee all pieces are 1N4004?
No. Kits may contain several 1N400x grades and other diode families. Check the specified contents of the selected pack before purchasing.
