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ST78-12S AI Analysis:
Datasheet, Specs, Alternatives & ECAD

AI summary

ST78-12S product

ST78-12S

Automotive Relays

automotive relay12 V coil35 A switchingwash tightthrough-hole

ST78-12S is a compact 12 V DC automotive relay for switching automotive loads up to 35 A, with a stated 60 A surge-current capability.

Best for

  • Automotive relay switching
  • Fuel-pump, heating, wiper, lighting, and instrument-control circuits

Avoid if

  • The application exceeds 30 VDC switching voltage or the stated current limits
  • A certified lifecycle, compliance declaration, or sourcing commitment is required but unavailable

Check before use

  • Exact contact form and coil-power code
  • Coil resistance and drive current
  • PCB footprint and wiring polarity
  • Continuous-load thermal performance

Key specifications

Coil voltage
12 V DC
Maximum switching current
35 A
Maximum inrush current
60 A
Dimensions
15.6 mm × 12.2 mm × 13.7 mm

Compliance & Environment

RoHS
RoHS marking shown; formal declaration not provided
REACH
-
MSL
-
ECCN
-
HTSUS
-

Application

Automotive control circuitsFuel pump controlHeating and wiper control

Datasheet

pYYBAGNlvmuAPcLdAAb-cx8MClw712.pdf

800 KB

Datasheet AI

CAD Models

Download ECAD models for ST78-12S: KiCad symbol & footprint, Altium footprint, PCB footprint, and 3D model.

EDA Symbol
Schematic symbol for your EDA tool
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PCB Footprint
Land pattern for PCB layout
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3D Model
STEP file for mechanical design
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KiCad Library
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Alternative components

Alternatives are being enriched. Analyze this part in PartGenie for the latest matches.

Design and risk insights

Questions & answers

ST78-12S is a STEIPU miniature automotive relay with a 12 V DC coil, wash-tight protection, and a compact 15.6 mm × 12.2 mm × 13.7 mm body.