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Alternatives to Littelfuse SP0503BAHT

Littelfuse SP0503BAHT and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

SP0503BAHT compared against its qualified second sources
SP0503BAHTLittelfuseSP0503BAHTGLittelfuse Inc.SP0504BAHTGLittelfuse Inc.+2more
FFF CompatibilityIdentical pinout (Pin 1 GND, Pins 2-4 I/O) and SOT-143-4 package foot-print.Identical physical SOT-143 package dimensions and mounting style.Identical 3-channel unidirectional TVS configuration, 5.5V reverse standoff voltage, and 8.5V clamping voltage.Requires a PCB redesign from the SOT-143-4 footprint to a SOT-23-5 footprint.SOT-23-5 package has a completely different body shape, lead frame, and footprint than SOT-143.Maintains the same 5.5V standoff, 8.5V clamping, and unidirectional channel characteristics, with one extra channel.
AI Summary

SP0503BAHT by Littelfuse: 8.5V Clamp Ipp Tvs Diode Surface Mount SOT-143-4.

This is the official direct replacement designated by Littelfuse. It transitions the obsolete part to a lead-free, RoHS-compliant green version while maintaining identical physical and electrical specifications.

  • Direct manufacturer recommended replacement
  • RoHS compliant/Green formulation (lead-free)
  • Exact drop-in replacement with no PCB layout modifications required

A sibling variant from the same SP05 family, this device offers 4 ESD protection channels in a standard SOT-23-5 package. It is an excellent choice if the PCB is undergoing a redesign and a more standard package is desired.

  • Offers an additional ESD protection channel (4 channels vs 3)
  • Uses the highly common and widely supported SOT-23-5 package
  • Identical electrical performance specs from the same Littelfuse family
  • Requires PCB layout redesign due to package change
Lifecycle StatusObsoleteActiveActive
Market AvailabilityDiscontinuedIn stockIn stock
REACHUnknownREACHREACH
RoHSRoHSRoHSRoHS
Description8.5V Clamp Ipp Tvs Diode Surface Mount SOT-143-48.5V Clamp Ipp Tvs Diode Surface Mount SOT-143-48.5V Clamp Ipp Tvs Diode Surface Mount SOT-23-5
ManufacturerLittelfuseLittelfuse Inc.Littelfuse Inc.
TypeTransient Voltage Suppressors (TVS)Transient Voltage Suppressors (TVS)Transient Voltage Suppressors (TVS)
DatasheetOpenOpenOpen
Lead TimeUnknown21 weeks13 weeks
Country of Origin---
Export Control Class NumberEAR99EAR99EAR99
HTSUS Code8541.10.0080--
Moisture Sensitivity Level1 (Unlimited)--
TypeZener--
ApplicationsGeneral Purpose--
Mounting TypeSurface Mount--
Package / CaseTO-253-4, TO-253AA--
Operating Temperature-40°C ~ 85°C (TA)--
Power Line ProtectionNo--
Supplier Device PackageSOT-143-4--
Unidirectional Channels3--

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Frequently asked questions

Yes. The Littelfuse SP0503BAHT is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.

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